FINAL DRAFT UGANDA 
STANDARD  
  FDUS 900 -1 
First Edition  
2011-mm-dd 
 
 
 Reference number  
FDUS 900 -1:201 1 
© UNBS 201 1  
  
Performance of household electrical appliances -refrigerating 
appliances — Part 1: Ene rgy labelling and minimum energy 
performance standards r equirements  
 FDUS 900 -1:201 1 
ii © UNBS 201 1 – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda S tandard does not purport to include all necessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 201 1  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standa rds 
P.O. Box 6329  
Kampala  
Uganda  
Tel: 256 41 4 505 995  
Fax: 256 41 4 286 123  
E-mail: unbs@infocom.co.ug  
Web: www.unbs.go.ug  FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  iii 
 Contents   
1 Scope  ................................ ................................ ................................ ................................ ................ 1 
2 Normative references  ................................ ................................ ................................ ....................... 2 
3 Terms and definitions  ................................ ................................ ................................ ...................... 2 
4 Calculations for the energy label  ................................ ................................ ................................ .....4 
4.1 General ................................ ................................ ................................ ................................ .............. 4 
4.2 Number of tests and processing of data  ................................ ................................ ......................... 4 
4.2.1 Number of units required  ................................ ................................ ................................ ................. 4 
4.2.2 Number of tests per unit  ................................ ................................ ................................ .................. 4 
4.2.3 Results  ................................ ................................ ................................ ................................ .............. 4 
4.3 Projected Annual Energy Consumption (PAEC)  ................................ ................................ ............. 4 
4.4 Comparative Energy Consumption (CEC)  ................................ ................................ ....................... 5 
4.4.1 General ................................ ................................ ................................ ................................ .............. 5 
4.4.2 Variant  ................................ ................................ ................................ ................................ ............... 5 
4.5 Determination of adjusted volume (V adj) ................................ ................................ .......................... 5 
4.5.1 Ks (volume adjustment factor) for compartments other than special compartments  .................. 5 
4.5.2 Ks for special type compartments  ................................ ................................ ................................ ...6 
4.5.3 Multi -use compartments  ................................ ................................ ................................ .................. 6 
4.6 Base Energy Consumption (BEC)  ................................ ................................ ................................ ...7 
4.7 Star Rating Index (SRI)  ................................ ................................ ................................ ..................... 7 
4.8 Star rating  ................................ ................................ ................................ ................................ ......... 8 
4.9 Energy labelling and MEPS for multi -group products  ................................ ................................ ....8 
4.10 Energy label validity and checking testing  ................................ ................................ ..................... 9 
5 Performance criteria  ................................ ................................ ................................ ......................... 9 
5.1 General ................................ ................................ ................................ ................................ .............. 9 
5.2 Rated volume  ................................ ................................ ................................ ................................ ....9 
5.3 Pull-down  ................................ ................................ ................................ ................................ .......... 9 
5.4 Operating Temperature Performanc e ................................ ................................ .............................. 9 
5.5 Minimum Energy Performance Standards  ................................ ................................ ...................... 9 
5.5.1 For a refrigerating appliance model manufactured or imported after 1 Octobe r 2010  .................. 9 
5.5.2 Fixed and variable allowance factors (Kf and Kv) ................................ ................................ .........  10 
5.5.3 Door allowance (Ad tot ) ................................ ................................ ................................ .................  11 
6 Application and test result formats  ................................ ................................ ...............................  13 
6.1 Registration  ................................ ................................ ................................ ................................ .... 13 
6.1.1 General ................................ ................................ ................................ ................................ ............  13 
6.1.2 Registration  ................................ ................................ ................................ ................................ .... 13 
6.1.3 Report format ................................ ................................ ................................ ................................ .. 13 
6.1.4 MEPS requirements  ................................ ................................ ................................ ........................  13 
6.1.5 Energy label requirements  ................................ ................................ ................................ .............  14 
6.1.6 Test method requirements  ................................ ................................ ................................ .............  14 
6.1.7 Durat ion of registration  ................................ ................................ ................................ ..................  14 
6.2 Date of manufacture  ................................ ................................ ................................ .......................  14 
Annex A (normative)  Methods for determining equivalent seal face perimeter leng ths of an 
equivalent regular appliance ................................ ................................ ................................ ..........  15 
A.1 Scope  ................................ ................................ ................................ ................................ ..............  15 
A.2 Appliance in groups 1 to 5T, 5B, 6U or 7  ................................ ................................ .......................  15 
A.3 Appliance in Group 5S  ................................ ................................ ................................ ...................  15 
A.4 Examples  ................................ ................................ ................................ ................................ ........  15 
Annex B (informative)   Example of energy efficien cy calculations  ................................ ..........................  18 
B.1 General ................................ ................................ ................................ ................................ ............  18 FDUS 900 -1:201 1 
iv © UNBS 201 1 – All rights reserved  
 B.2 Appliance details and raw data  ................................ ................................ ................................ ..... 18 
B.3 Classification of the appliance  ................................ ................................ ................................ ...... 18 
B.4 Calculation of Comparative Energy Consumption  ................................ ................................ ....... 19 
B.5 Calculation of adjusted volum e (Vadj Tot)  ................................ ................................ ....................  19 
B.6 Calculation of Base Energy Consumption and Star Rating Index, and determination of 
star rating  ................................ ................................ ................................ ................................ ....... 21 
B.7 Calculat ion to check whether all PAEC values are below MEPS cut -off ................................ ..... 21 
B.7.1  General  ................................ ................................ ................................ ................................ ...........  21 
B.7.2  MEPS allowance factors  (Kf, Kv and Ka) ................................ ................................ ......................  21 
B.7.3  Door allowance  (Ad tot ) ................................ ................................ ................................ .................  22 
B.7.4  Ice dispenser allowance  (Awi) ................................ ................................ ................................ ....... 23 
B.7.5 Comparison of MEPS cut off and  PAEC AV ................................ ................................ ....................  23 
Annex C (informative)   Determination of the maximum CEC value at which a model would qualify 
for a desired star rating  ................................ ................................ ................................ .................  24 
C.1 General  ................................ ................................ ................................ ................................ ...........  24 
C.2 Determination of target CECmax by formula  ................................ ................................ ................  24 
C.2.1  Method  ................................ ................................ ................................ ................................ ............  24 
C.2.2  Example  ................................ ................................ ................................ ................................ ..........  24 
C.3 Estimation of CEC max using a conversion factor method  ................................ .............................  25 
C.3.1  Method  ................................ ................................ ................................ ................................ ............  25 
C.3.2  Example  ................................ ................................ ................................ ................................ ..........  25 
Annex D (normative)   Application for registration of a refrigerating appliance for energy labe ling 
and MEPS  ................................ ................................ ................................ ................................ ....... 27 
E.1 Introduction  ................................ ................................ ................................ ................................ .... 27 
E.2 Scope  ................................ ................................ ................................ ................................ ..............  27 
E.3 Guidance on t he use of this application form  ................................ ................................ ...............  27 
E.4 Example of online data required for application  ................................ ................................ ...........  27 
Bibliography  ................................ ................................ ................................ ................................ ...............  35 
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  v 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Tourism, Trade and 
Industry established under Cap 327 , of the Laws of Uganda.  UNBS is mandated to co -ordinate the 
elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT/SPS Agreements of the World Trade Organisation (WTO).  
The work of preparing  Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and consists of representatives of 
consumers, traders, academicians, manufacturers, government and other  stakeholders.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. The committee reviews the comments before recommending the draft standards 
for approval and declaration as U ganda Standards by the National Standards Council.  
Committee membership  
The following organizations were represented on the Energy Management Technical Committee, UNBS/TC 
13, during the development of this standard:  
 Department of Mechanical Engineering, Ma kerere University  
 Econoler  
 Electricity Regulatory Authority (ERA)  
 GTZ-Promotion of Renewable Energy and Energy Efficiency Programme (GTZ -PREEEP)  
 Ministry of Energy and Mineral Development  
 Private Sector Foundation Uganda (PSFU)  
 Uganda Manufacturers’ Associ ation (UMA)  
 Uganda National Bureau of Standards (UNBS)  
 Water and Electricity Consumers’ Association (WECA)  
The following organizations were represented on the Lighting Appliances Sub -committee of the Energy 
Management Technical Committee, UNBS/TC 13, duri ng the development of this standard:  
 Centre for Research in Energy and Energy Conservation (CREEC), Makerere University  
 Department of Electrical Engineering, Makerere University  
 Econoler  
 Industrial Technical Solutions (ITS) (U) Ltd  
 Kiboko Enterprise (U) L td 
 Ministry of Works and Transport  
 Osram/Dembe Trading Co. Ltd  
 Uganda National Bureau of Standards (UNBS)  
 Uganda National Chamber of Commerce and Industry (UNCCI)  
 Ultra -Tec Uganda Ltd   FINAL DRAFT UGANDA STANDARD  FDUS 900 -1:201 1 
 
© UNBS 201 1 – All rights reserved  1 
 Performance of household electrical appliances -refrigerating 
appliance s — Part 1: Energy labelling and minimum energy 
performance standards requirements  
1 Scope  
This Final Draft Uganda Standard specifies the energy labeling and Minimum Energy Performance Standard 
(MEPS) requirements for vapour compression refrigerating appli ances that can be connected to mains power 
and which are within the scope of FDUS 900 -2. Such refrigerating appliances that are used in the commercial 
sector are included within the scope. This standard does not specify safety requirements.  
Separate stand  alone wine storage cabinets are not specifically within the scope of this standard.  
In particular, this standard specifies the following:  
a) Projected Annual Energy Consumption (PAEC ); 
b) adjusted volume ; 
c) Comparative Energy Consumption (CEC ); 
d) star rating ; 
e) performance criteria for energy label validity ; 
f) some of the requirements for energy label validity ; 
g) Minimum Energy Performance Standards (MEPS) for refrigerating appliances for MEPS 2010 
requirements ; and  
h) test report format and printing requirements for refrige rating appliance energy labels.  
The following products are excluded from the scope of energy labelling and MEPS:  
a) products that are designed exclusively for use in caravans, vehicles ( for example,  mobile homes, 
campervans and/or rail cars) or boats and whic h have a total gross volume of less than 60 L; 
b) portable products that have a gross volume of less than 30 L; 
c) products that have a gross volume of less than 30  L where the refrigeration function is secondary ( for 
example,  boiling or cooled water dispensers ); 
d) products that have no options for connection to a 230 V or 400 V 50 Hz mains electricity supply ; and  
e) products that cool using technologies other than the vapour compression cycle.  
This standard shall be read in conjunction with FDUS 900 -2. 
Note: In th is standard, Star Rating  will also mean  Number Rating.  FDUS 900 -1:201 1 
2 © UN BS 201 1 – All rights reserved  
 2 Normative references  
The following referenced documents are indispensable for the application of this document. For dated 
references, only the edition cited applies. For undated references, the latest e dition of the referenced 
document (including any amendments) applies.  
ISO 15502, Household refrigerating appliances — Characteristics and test methods  
FDUS 900 -2, Performance of household electrical appliances  — Refrigerating appliances — Part 2: Energy 
consumption and performance  
3 Terms and d efinitions  
For the purposes of this standard, the terms and definitions given in FDUS 900 -2, and the following apply.  
3.1 
adjusted volume (V)  
3.1.1 
adjusted volume  (Vadj) 
rated gross volume in litres of a compartment adjusted to compensate for heat loadings on spaces which are 
at temperatures other than that of fresh food type space. It is determined as specified in 4.5.  
3.1.2  
total adjusted volume  (Vadj tot) 
total of the  adjusted volume,  Vadj, in litres of all compar tments of the appliance  
3.2 
Base Energy Consumption (BEC)  
nominal energy consumption of an appliance model in kWh/y of a given group and total adjusted volume with 
a SRI of 1.00 ( refer also to 4.6)  
3.3 
check test  
full or part test in accordance with the re levant standard to verify the performance or energy consumption, or 
both, of an individual brand and model bearing an energy label  
3.4 
Comparative Energy Consumption (CEC)  
nominal average energy consumption of a model  in kWh/y  of refrigerating appliance. I t is based on the 
PAEC av of the model (refer also to 4.4). The CEC appears on the energy label.  
3.5 
compartment and sub -compartment  
3.5.1   
compartment  
enclosed space within a refrigerating appliance, which is directly accessible  through one or more extern al 
doors. A compartment may contain one or more sub -compartments and  one or more convenience features.  
3.5.2   
sub-compartment  
permanently enclosed space within a compartment or sub -compartment which is designated as being a 
different type of food storage space, ( that is,  has a different operating temperature range) from the 
compartment or sub -compartment within which it is located  
Throughout this standard , except when referring to door allowances  (Ad or Ad tot) or sealing face dimensions 
(see also Annex A), the term ‘compartment’ means ‘com partment and sub -compartment’, or  ‘compartment or 
sub-compartment’, or ‘compartment nor s ub-compartment’ as appropriate for the context.  
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  3 
 3.6 
family of models  
range of models of the one brand, to which a single set of tes t reports is applicable and where each of the 
models has the same relevant physical characteristics, comparative energy consumption, energy efficiency 
rating and performance characteristics and which are grouped for the purpose of registration. The term 
‘model’ is synonymous with ‘family of models’.  
3.7 
good 
product to which this standard applies  
3.8 
grandfathering  
expiring, in this standards.  
3.9 
Minimum  Energy Performance Standard (MEPS)  
mandatory level of energy efficiency  (in kWh/y.)  which has to be me t by each individual unit of an appliance 
model. The MEPS cut -off level is the maximum allowable energy consumption of the model determined from 
its size, features and configuration (refer to 5.5).  
3.10 
Projected Annual Energy Consumption (PAEC)  
estimate o f energy  (in kWh/y.) used by a single unit during one year’s use. It assumes a particular ambient 
temperature and normally no door openings (refer also to 4.3).  
3.11 
portable products  
Units that are specifically designed to be moved from place to place as  part of their normal use as stated in 
the accompanying product literature ( that is. operating manual or user instructions).  
NOTE  Energy labelling and MEPS is only exempt for portable products where they have a gross volume of less than 30 
litres.  
3.12 
star rating   
number of stars  or figure  displayed on the energy label. Available stars are between a minimum of one and a 
maximum of ten. The star rating is calculated from the Star Rating Index ( refer also to 4.8.) (Dimensionless)  
3.13 
Star Rating Index (SRI)  or Number Rating Index (NRI)  
indication of the claimed energy efficiency of a model. A higher SRI /NRI indicates higher energy efficiency. It 
is derived from the CEC. ( refer to 4.7) (Dimensionless)  
3.14 
statements of intention  
3.14. 1 
shall 
indicates that a  statement is mandatory  
3.14. 2 
should  
indicates a recommendation  
3.15  
variant  
alternative version of a model which has the same sales specification and the same model number or other 
form of designation as another version of the model, and offers the same  performance except that it has a 
different PAEC av, and may have a different SRI ( refer also to 4.4.2) . FDUS 900 -1:201 1 
4 © UN BS 201 1 – All rights reserved  
 4 Calcula tions for the energy lab el  
4.1 General  
This clause sets out the equations and procedures for calculating values of the CEC and the star rating , which 
appear on an energy label.  
The process consists of measuring the tested energy consumption (E t), of each unit tested, then calculating 
the projected annual energy consumption (PAEC) of the unit. The comparative energy consumption (CEC) for 
the mode l is determined from the values of PAEC for the units tested to determine the label particulars. The 
CEC and total adjusted volume (V adj tot) are then used to calculate the star rating index and the star rating.  
Quantities used in conjunction with this standard shall be measured in accordance with FDUS 900 -2. 
Unless otherwise stated, numbers shall be rounded and recorded to five significant figures .  
Wine storage cabi nets may be tested to FDUS 900-2 and labelled to this standard on a voluntary basis. Any 
supplier, which elects to place an energy label on a wine storage cabinet, shall register the product with the 
relevant regulator. Before such products can be registered to carry an energy label, they must also meet the 
relevant MEPS and other performance re quirements. Any cabinet which has other standard compartments in 
addition to a wine storage compartment is included within the scope of this standard and shall meet all the 
relevant performance requirements for products within the scope of energy labelling  and MEPS.  
NOTE For an example of calculations carried out on a typical set of test results, refer to Annex B. 
4.2 Number of tests and processing of d ata 
4.2.1 Number of units required  
For the purpose of determining the CEC of a model for labelling, three separate units of the nominated model 
shall be tested for energy consumption in accordance with FDUS  900-2. At the supplier’s discretion, more 
than three units may be tested.  
The energy consumption declared on the energy label is based on the samples submi tted for registration but it 
is the manufacturer’s responsibility to ensure that all product supplied to the market complies with the relevant 
regulatory requirements. Monitoring production is advisable to ensure ongoing compliance. The purpose of 
testing the three (or more) samples for registration is to obtain representative spread of products on which to 
base the energy label declaration. A sample of three or more provides a better estimate than can be obtained 
from tests on a single sample.  
Suppliers ar e not permitted to select results for submission for registration from a larger pool of results where 
data for the selected units provides an inaccurate estimate of the mean energy consumption for the model.  
4.2.2 Number of tests per unit  
Each unit shall b e tested with sufficient test runs to enable a valid value of E t to be determined for that unit 
(refer to the relevant annex of FDUS 900-2). This determination shall be documented in a test report 
containing the test results for all test runs used to deriv e E t (refer to FDUS 900. 2). 
4.2.3 Results  
After testing three or more separate units in accordance with 4.2, the separate values of PAEC shall be 
averaged and referred to as PAEC av. 
4.3 Projected Annual Energy Consumption (PAEC)  
The PAEC of a single refrig erating appliance shall be calculated using the following equation:  FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  5 
 
 kWh/y
1000365
tE PAEC …1 
where,  
Et tested energy consumption expressed in watt hours per 24 h, rounded to the nearest whole number.  
Any mode that reduces energy consumption under energy  test conditions (including management of heaters) 
but which is not generally saving energy during normal use shall be defeated where possible for energy 
consumption testing. Where the refrigerating appliance has an energy reduction mode that could not be 
disabled for the energy consumption test, then the energy impact of the mode shall be quantified and this 
value used to adjust each measured energy consumption rate in accordance with FDUS 900 -2 or in 
accordance with the following equation:  
(kWh/y) 8.76 2
1000365
r t  P E PAEC
 …2 
where 
Pr is the average power reduction resulting from the energy reduction mode in watts.  
NOTE Clause 5.7 and FDUS 900-2 provides guidance for the determination of Pr. 
4.4 Comparative Energy Consumption (C EC) 
4.4.1 General  
The CEC for a model shall not be less than the average (rounded to a whole integer) PAEC value ( that is,  
PAEC av) for the three (or more) units which are tested to determine the label particulars. The CEC shall be an 
integer with units of kWh/y.  
The CEC declared on the energy label should be representative of the average production energy 
consumption.  
NOTE  At the supplier’s discretion, the declared CEC may be greater than the PAEC av to allow for variations such as 
manufacturing tolerances. Where the production variability is gr eater than 5  %, it may be advisable to adjust the claimed 
CEC to be a value which is higher than the sample mean. However, the claimed CEC may not exceed MEPS level (refer 
to 5.5.1).  
4.4.2 Variant  
Two or more variants of a model may use a common label with  a CEC not less than the highest PAEC av 
(rounded to the nearest kWh) of those variants.  
4.5 Determination of a djusted volume (V adj) 
4.5.1  Ks (volume adjustment factor) for compartments other than special compartments  
Ks values shall be applied to food sto rage of cellar, fresh food, chill, ice -making, short -term frozen food and 
freezer types defined in FDUS 900-2 in accordance with Table 1.  FDUS 900 -1:201 1 
6 © UN BS 201 1 – All rights reserved  
 Table 1 — Volume adjustment factors for specified types of compartments  
Compartment type  Volume adjustment factor  
(Ks) 
Cellar  0.7 
Fresh food  1.0 
Chilli  1.1 
Ice-making  1.2 
Short term frozen food storage  1.4 
Freezer  1.6 
 
4.5.2  Ks for special type compartments  
Ks values shall be applied to special (unfrozen) and special (frozen) type compartments in accordance with  
Table 2 where the compartment cannot be classified into one of the standard types specified in 4.5.1 . 
For any special compartment, the value of K s shall be determined by the warmest temperature of the 
continuous operating temperature range that is claimed  for it by the manufacturer. For example, if the claimed 
range of a special (frozen) type compar tment is −  12 °C or colder, then the warmest temperature of its claimed 
range lies in the range ‘warmer than −  15 °C but not warmer than −  9 °C’, so the value of K s is 1.4.  
Table 2 — Volume adjustment factors for special type compartments  
Claimed maximum o f operating temperature 
range  
(Tm) Volume adjustment factor  
(Ks) 
Warmer than 6 °C 

3 3232 m
T
 
Warmer than 3 °C but not warmer than 6 °C 1.0 
Warmer than -2 °C but not warmer than 3 °C 1.1 
Warmer than -9 °C but not warmer than -2 °C 1.2 
Warm er than -15 °C but not warmer than -9 °C 1.4 
-15 °C or colder  1.6 
 
4.5.3  Multi -use compartments  
The volume adjustment factor to be applied to any multiuse type compartment shall be determined by the food 
storage type that is applicable when it is set to the function selected for continuous operation during the 
determination of energy consumption (usually the coldest function). Where this function is a special (unfrozen) 
or (frozen) compartment type, the applicable value of  Ks shall be determined according  to 4.5.2 . 
The adjusted volume of a compartment is then given by the following equation:  
Vadj = Vg x Ks (litres)  ..3 
where,  
Vg is the rated gross volume , in litres, of the compartment ;  FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  7 
 Ks is the  volume adjustment factor for the food storage type of the co mpartment, determined as 
specified in 4.5.1, 4.5.2  and 4.5.3  (refer to 5.5.3 for additional use of Ks.) 
4.6 Base Energy Consumption (B EC) 
The base energy consumption for an appliance model shall be calculated from the following equation:  
 0.67totadj v f xV C C BEC 
(kWh/y)  …4 
where 
Cf is the fixed allowance factor , in kilowatt hours per year,  for its group ;  
Cv is the variable allowance factor , in kilowatt hours per litre per year,  for its group ;  
Vadj tot is the total adjusted volume , in litres, for the model.  
The BEC is not rounded.  
Factors C f and C v shall be in accordance with Table 3.  
Table 3 — Fixed and variable allowance factors  
Appliance group  Fixed allowance factor  
(Cr) 
kWh/y  Variable allowance factor  
(Cv) 
kWh/y/L  
1, 2 and 3  200 4.0 
4, 5T, 5B and 5S  150 8.8 
6C, 6U and 7  150 7.5 
 
4.7 Star Rating Index (SRI)  
To determine the star rating index of a refrigerating appliance, an energy consumption reduction factor (ERF) 
of 0.23 shall be used for all groups.  
The star rating index shall then be given by the fo llowing equation:  
Star Rating Index = 1 + 





ERF logBECCEClog
1ee              …5 
where 
CEC  is the C omparative Energy Consumption , in kWh/year, for the model (see 4.4 ); 
BEC is the  Base Energy Consumption , in kWh/y, for the model (see 4.6 ); 
ERF  is the  Energy consumption Reduction Factor = 0.23 for all appliance groups.  
NOTE 1  Where the CEC of a model is equal to its Base Energy Consumption (BEC), its star rating index is 1.00.  FDUS 900 -1:201 1 
8 © UN BS 201 1 – All rights reserved  
 NOTE 2  The energy consumption reduction factor is the proportion by which the CEC of a model would have to be 
reduced to increase its star rating index by 1.00. For all groups , this is a 23  % reduction in energy consumption per 
additional star earned.  
4.8 Star rating  
The star rating shall be obtained from Table  4 using the star rating i ndex (SRI) determined in 4.7. 
NOTE 1  Refer to Annex C for a method to estimate the CEC required for any particular target star rating.  
NOTE 2  For an example of calculations carried out on a typical set of test results, refer to Annex B. 
Table 4 — Determina tion of star rating  
SRI Star rating  
SRI < 1.5  1 
1.5 ≤ SRI < 2.0  1.5 
2.0 ≤ SRI < 2.5  2 
2.5 ≤ SRI < 3.0  2.5 
3.0 ≤ SRI < 3.5  3 
3.5 ≤ SRI < 4.0  3.5 
4.0 ≤ SRI < 4.5  4 
4.5 ≤ SRI < 5.0  4.5 
5.0 ≤ SRI < 5.5  5 
5.5 ≤ SRI < 6.0  5.5 
6.0 ≤ SRI < 7.0  6 
7.0 ≤ SRI < 8.0  7 
8.0 ≤ SRI < 9.0  8 
9.0 ≤ SRI < 10.0  9 
10.0 ≤ SRI  10 
 
4.9 Energy  label ling and MEPS fo r multi -group produc ts 
As specified in FDUS 900-2, the energy consumption of a refrigerating appliance shall be determined for the 
coldest claimed configura tion for all multi -use compartment(s). This value shall be used to determine the 
primary comparative energy consumption and the star rating for the appliance shown on the energy label.  
However, where one or more multi -use compartments can be operated in a way that can change the product 
group, the manufacturer may elect to claim the energy consumption and star rating for each such group 
configuration in addition to the primary Comparative Energy Consumption. Where any additional groups are 
claimed, the manu facturer shall nominate which group is the primary group for the purposes of energy 
labelling.  
Any claimed additional groups for a model which are documented in the product literature, shall be separately 
registered for energy labelling and MEPS for the mo del. Each configuration registered will be individually listed 
on the energy rating website. Each additional configuration registered shall comply with the relevant MEPS 
requirements for the group registered.  
The product shall be capable of meeting pull do wn test and temperature operation test requirements (refer to 
5.3 and 5.4) for all claimed groups. However, only a single set of test reports for the group configuration that is FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  9 
 most onerous is required to demonstrate compliance with temperature operation test or pull down test 
requirements for energy labelling and MEPS registration.  
The energy label displayed on the product shall be the registered details for the primary group nominated.  
NOTE A separate application for each group claimed needs to be submit ted for the model.  
4.10 Energ y label validity and checking testing  
The CEC value shall be accepted as valid if, when a single sample of a labelled model is tested for initial 
screening test, its PAEC is such that : 
PAEC  ≤ 1.075 x CEC …6 
If this is not the c ase, the CEC shall be accepted as valid if three additional units are tested and the average 
PAEC of these additional units is such that : 
PAEC (av) ≤ 1.075 x CEC …7 
NOTE The 7.5  % in Equations 6 and 7 are not to be applied as a tolerance on the original tes t measurements which 
are used to support an application for registration. The 7.5  % is only an allowance for possible variation in test results for 
test samples due to production variability, sampling error and all measurement uncertainties in or between l aboratories 
which is applied when assessing a check test result.  
5 Performance criteria  
5.1 General  
The criteria set out in 5.2 to 5.5 shall be met by each unit tested, for the refrigerating appliance model to 
comply with energy labelling and MEPS require ments.  
5.2 Rated volume  
Each compartment gross and storage volume and total gross and storage volume of the appliance shall meet 
the requirements set out in FDUS  900-2. 
5.3 Pull-down 
The appliance shall meet the requirements set out in FDUS  900-2. While al l units within a model are required 
to meet the pull down requirements in Part 1, only a test report for a single unit is required to confirm this for 
the purposes of energy labelling and MEPS registration.  
5.4 Operating Temperature Performance  
The applian ce shall meet the requirements set out in FDUS 900-2. While all units within a model are required 
to meet the temperature operation performance requirements in this standard,  only a test report for a single 
unit is required to confirm this for the purposes  of energy labelling and MEPS registration.  
5.5 Minimum Energy Performance Standards  
5.5.1 For a refrigerating appliance model manufactured or imported after 1 October 2010  
The PAEC for each unit shall not exceed the MEPS 2010 cut -off level, which is deter mined as follows:  
MEPS 2010 cut -off level  = [Kf +(Kv x Vadj tot)] x Ka + Ad tot + Awi …8 FDUS 900 -1:201 1 
10 © UN BS 201 1 – All rights reserved  
 where  
Kf is the fixed allowance factor , in kWh/year,  for its appliance group ( refer to Table 5); 
Kv is the  variable allowance factor , in kWh/y/L (refer to Table 5);   
Ka is the  adaptive defrost adjustment factor; Ka = 1.05 where an adaptive defrost system is present (for 
groups 1, 5T, 5B, 5S and 7 only), or  Ka = 1.00 where the feature is not present (dimensionless) ; 
Vadj tot  is the  total adjusted volume  in litres  (refer to 4.5) ; 
Ad tot is an allowance , in kWh/y, which is made where the external doors provided on an appliance differ 
from the regular arrangement for that appliance group as described in Table 6. It is calculated by  the 
method set out in 5.5.3 ;  
Awi  is an a llowance of 128 kWh/y which applies where an appliance has a ‘through -the-door ice 
dispenser’,  that is,  it has an automatic ice -maker coupled with a device for delivery on demand of ice 
externally through a door. This allowance also applies if the through -the-door dispenser also 
dispenses chilled water.  
Neither tested energy consumption of all the samples submitted for registration nor the claimed CEC (refer to 
4.5) shall exceed the specified MEPS level.  
NOTE 1 An example of a calculation of a MEPS 2010 cut  off level is included in Annex B. 
NOTE  2 Where it is considered that other feature -related allowances should be provided, particularly where the feature 
will reduce energy consumption in use but that reduction would not be evident on energy consumption te sts conducted in 
accordance with FDUS 900 -2, then those allowances should be made only by amendment to this standard.  
NOTE  3 If any of the individual test results are close to the MEPS limit or if there is significant variation in the sample 
results, manuf acturers should only proceed with caution after additional testing indicates that they are confident that all 
production units are likely to pass the MEPS requirement.  
5.5.2 Fixed and variable allowance factors (Kf and Kv) 
The fixed and variable allowance factors are determined from the group classification of the appliance (refer to 
FDUS 900 -2 and to Table 5. 
Table 5 — MEPS 2010 cut -off level factors  
Appliance group  Fixed allowance factor  
(Kr) 
kWh/y  Variable allowance factor  
(Kv) 
kWh/y/L  
1 296 0.356  
2 308 0.309  
3 301 0.366  
4 295 0.351  
5T 334 0.384  
5B 440 0.382  
5S 607 0.180  
6C 202 0.514  
6U 299 0.317  
7 383 0.514  FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  11 
  
5.5.3 Door allowance (Ad tot) 
The door allowance applies when the arrangement of external doors on an upright appliance differs from that  
set out in Table 6, either in the number of doors on the appliance or because the compartments to which they 
give access are of different food storage types from those specified in Table 6. 
There shall be no door allowances for chest -type appliances, irre spective of the configuration.   
Table 6 — Regular door provisions for appliance groups  
Appliance group  External doors into compartment type  
Fresh food storage  Freezer  
1, 2 and 3  1 0 
4, 5T, 5B and 5S  1 1 
6U and 7  0 1 
 
Ad tot of an appliance shall be t he sum of the door allowances ( Ad) for each food storage compartment type. Ad 
shall be derived for external doors only, that is,  doors on sub -compartments do not affect door allowances. Ad 
for a compartment type or Ad tot for an appliance may be either pos itive or negative.  
Ad for each door that accesses a compartment of a nominated food storage type shall be derived as follows:  
Ad = Kd x Ks x (La - Le) …9 
where  
Kd is the door allowance factor  in kWh/y/m  (refer to Table 7);  
Ks is the  volume adjustment fac tor (refer to Table 1 or 2 as applicable) ; 
La is the  sum of the lengths , in metres,  of the actual sealing face perimeters of all external doors to 
compartments of the food storage compartment type . 
Le is the  estimated length,  in metres, of the sealing face  perimeter of the external door of a fresh food or 
freezer compartment on an equivalent regular appliance . 
Where there is more than one compartment of the type, then all those compartments shall be taken into 
account.  
Where there is more than one door to a  compartment then all doors shall be taken into account, including any 
door within a door.  
Where, on one compartment, two doors seal one against the other along a common edge but not on a cabinet 
rail (for example, French doors) then a single seal face len gth, not two, shall be included for that edge ( refer to 
Figure 1) . 
Each perimeter shall be measured on the centre -line of the sealing face ( refer to Figure 2) . Where seal faces 
are not in one plane, extra seal length that results from transitions between p lanes shall not be included.  
Le for doors of storage types other than fresh food or freezer is always zero because no doors of other types 
are included in any of the regular arrangement provisions set out in Table 6. 
The method of determining Le shall be a s specified in Annex A. 
NOTE The method of calculating La, Le, Ad and Ad tot for a hypothetical appliance is demonstrated in Annex B. FDUS 900 -1:201 1 
12 © UN BS 201 1 – All rights reserved  
  
 
(a)                                                              (b) 
Two doors sealing on a     Two doors sealing one  
rail either fixed or        against the other (that is,  
    movable between their      one sealing face -French  
adjacent edges (that is,      doors)   
two sealing faces)  
 
(a) L a= 2W 1 + 2W 2 + 4H      (b)  L a= 2W 1 + 2W 2 + 3H  
Figure 1 — Example determination o f La for doors with a common seal  
 
Figure 2  — Location of  seal face centre -line FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  13 
 Table 7 — MEPS 2010 door allowance factors by appliance group  
Appliance group  Door allowance factor ( Kd) 
kWh/y/m  
1, 2, 3  56 
4 64 
5T, 5B  67 
5S 74 
6U 56 
7 67 
 
NOTE  No do or allowances are applicable to Group 6C.  
6 Application a nd test result form ats 
6.1 Registration  
6.1.1 General  
Where the relevant regulatory authority requires registration or approval of products for energy labelling and 
MEPS, clauses 6.1.2 to 6.1.8 shal l apply.  
6.1.2 Registration  
An electronic application for registration of the refrigerating appliance brand and model, in the format shown in 
Annex D of this standard, shall be submitted through the on -line registration system.  
6.1.3 Report format  
A report  in the form specified in FDUS 900-2 for each model tested should accompany the energy labelling 
and MEPS application.  
6.1.4 MEPS requirements  
All appliances within the scope of this standard that are manufactured or imported for sale on or after 1 
October  2010 shall be registered to this standard and shall meet the MEPS 2010 requirements. At the time of 
sale, suppliers shall be able to demonstrate that the appliance held a valid registration which indicates 
compliance with the relevant MEPS requirements at  the time of manufacture or importation. The date of 
manufacture of each appliance shall be able to be determined from information legibly and durably marked on 
the appliance. The date of manufacture may be non -encrypted, encrypted or able to be determined  from a 
serial number or other markings on the appliance and shall be visible when the appliance is in its position of 
normal use. Information on how to determine the date of manufacture shall be provided on the registration 
form (see Annex D). 
NOTE 1 Regu lators will use the date of manufacture as a guide as to when a product may have been available for sale 
in Uganda. It is therefore preferable to be able to determine at least the month and year of manufacture from information 
on the appliance. This does n ot however preclude the use of other markings, for example serial numbers, which indicate 
those appliances manufactured within a period of time, where such details are provided with the registration.  
NOTE 2  Irrespective of the information marked on the app liance, local manufacturers or importers may be required to 
provide documentary evidence of the actual manufactured or imported date if requested by a regulator.  FDUS 900 -1:201 1 
14 © UN BS 201 1 – All rights reserved  
 6.1.5 Energy label requirements  
All appliances within the scope of this standard that are manu factured or imported for sale in Uganda on or 
after 1 October 2010 shall be registered to this standard. At the time of sale, suppliers shall be able to 
demonstrate that the appliance held a valid registration for energy labelling at the time of manufactur e or 
importation.  
6.1.6 Test method requirements  
All registrations to FDUS 900-1 (this standard) shall include results from test reports to FDUS 900-2  
6.1.7 Duration of registration  
Registrations for energy labelling and MEPS may have a validity of up to five years.  
Registration expiry dates are reviewed annually and records may be extended (up to the five year limit in one 
year increments) where there is no forthcoming change to regulatory requirements.  
6.2 Date of manufacture  
The date of manufacture of e ach appliance shall be able to be determined from information legibly and 
durably marked on the appliance. The date of manufacture may be non -encrypted, encrypted or able to be 
determined from a serial number or other markings on the appliance and shall be  visible when the appliance is 
in its position of normal use.  
Information on how to determine the date of manufacture shall be provided on the registration form (see 
Annex D). 
NOTE 1 Regulators will use the date of manufacture as an indicator of when a pro duct may have been available for 
sale. It is therefore preferable to be able to determine at least the month and year of manufacture from information on the 
appliance. This does not however preclude the use of other markings, for example serial numbers, wh ich indicate those 
appliances manufactured within a period of time, where such details are provided with the registration.  
NOTE 2  Irrespective of the information marked on the appliance, local manufacturers or importers may be required to 
provide documenta ry evidence of the actual manufactured or imported date if requested by a regulator.  FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  15 
 Annex A 
(normative)  
 
Methods for determining equivalent seal face  perimeter  lengths of an 
equivalent regular appliance  
A.1 Scope  
This annex specifies the methods for deriv ing Le, the estimated length of the seal face perimeter of a fresh 
food or freezer compartment of an equivalent regular appliance when calculation of the door allowance for a 
test appliance is required ( refer to 5.5.3) . 
A.2 Appliance in groups 1 to 5T, 5B,  6U or 7 
The sealing face width for both fresh food and freezer compartments on the equivalent regular appliance shall 
be equal to that of the longest full -width seal face on the test appliance or, if no seal face extends the full 
width, the sealing face w idth shall be the largest of any sum of seal face widths that, taken together, extend 
across the width of the appliance.  
The height of the fresh food compartment seal face on the equivalent regular appliance shall be the sum of 
the areas enclosed by the se al face perimeters on all unfrozen food storage compartments of the test 
appliance, divided by the sealing face width.  
The height of the freezer compartment seal face on the equivalent regular appliance shall be the sum of the 
areas enclosed by the seal fa ce perimeters on all frozen food storage compartments of the test appliance, 
divided by the sealing face width.  
A.3 Appliance in Group 5S  
The sealing face height shall be the same for both fresh food and freezer compartments on the equivalent 
regular appli ance and shall be equal to that of the longest full -height seal face on the test appliance or, if no 
seal face on the appliance is of full height, the sealing face height shall be the sum of the seal face lengths on 
either the freezer side or the fresh foo d side, whichever is the greater (see example in Figure A .1(d)).  
The width of the fresh food compartment seal face on the equivalent group 5S regular appliance shall be the 
sum of the areas enclosed by the seal face perimeters on all unfrozen food storage compartments of the test 
appliance, divided by the sealing face height.  
The width of the freezer compartment seal face on the equivalent group 5S regular appliance shall be the sum 
of the areas enclosed by the seal face perimeters on all frozen food storag e compartments of the test 
appliance, divided by the sealing face height.  
A.4 Examples  
Figure A .1 shows how these methods are used on some typical appliances and gives example calculations of 
Le for various combinations of doors.  FDUS 900 -1:201 1 
16 © UN BS 201 1 – All rights reserved  
 
 
 
 
 
Figure A .1 (a) and ( b) — Exampl es of determining estimated seal face peri meter  length ( Le) 
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  17 
 
 
 
 
Figure A .1 (c) and (d)  Examples of determining estimated seal face perimeter length  (Le) FDUS 900 -1:201 1 
18 © UN BS 201 1 – All rights reserved  
 Annex B 
(informative)  
 
Example of  energy efficiency calcu lations  
B.1 General  
This annex examines three units of a hypothetical appliance. Using the appliance detail and test results 
provided, a series of calculations is performed, as required to determine the energy label particulars as 
follows:  
a. Comparative Energy  Consumption ; 
b. Base Energy Consu mption ; 
c. Star Rating Index ; 
d. Star rating ; 
e. the MEPS 2010 cut -off level ; and  
f. whether the appliance model complies with MEPS 2010 requirements.  
B.2 Applian ce details and raw d ata 
The appliance is a 380-litre frost -free unit with an adaptive defrost control. The  rated gross volume, gasket 
dimensions, location and type of each compartment are shown in  Figure B .1. The appliance does not have a 
through -the-door ice dispenser.  
The values of tested energy consumption derived from tests of these three units are shown i n Table B .1. 
Table B.1 — Energy consumption test results  
Unit Tested energy consumption ( Et) 
Wh/24 h  
1  1530  
2 1501  
3 1588  
 
B.3 Classification of the a ppliance  
Using the information given and the relevant clauses of FDUS 900 -2, the classification of th e appliance is 
determined as follows:  
a) compartment type , as shown in each case in Figure B .1; 
b) appliance configuration , upright ; FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  19 
 c) appliance designation , refrigerator/freezer ; 
d) appliance group , 5T; and  
e) defrost type , adaptive.  
B.4 Calculation of Comparative Ener gy Consumption  
The tested energy consumption ( Et) of each unit is used to calculate the projected annual energy consumption 
(PAEC ) for each unit in accordance with Clause 4.3, and the PAEC av for the three is then calculated. This 
calculation is summarized in Table B .2. 
Table B.2 — Projected annual energy consumption  
Test unit number  Tested energy consumption  
Wh/24 h  Projected annual energy consumption  
kWh/y  
1  1530  558.45  
2 1501  547.87  
3 1588  579.62  
           PAEC av = 561.98 kWh/y  
 
The average PAEC is  rounded to the nearest unit to obtain the minimum allowable value for CEC. A higher 
value of CEC may be chosen however this value would have to be used in all subsequent calculations ( that is,  
in the calculations of SRI).  
Comparative Energy Consumption (C EC) = 562 kWh/y  
B.5 Calculation of adjusted v olume  (Vadj Tot ) 
Using the rated gross volume of each compartment type (from Figure B .1) and the applicable volume 
adjustment factors ( Ks) (from Table 1 and Table 2) the adjusted volume ( Vadj) for each compartme nt type and 
the total adjusted volume ( Vadj tot) of the model are then calculated in accordance with 4.5 and 4.6. This 
calculation is summarized in Table B .3. 
 FDUS 900 -1:201 1 
20 © UN BS 201 1 – All rights reserved  
 
 
 
Dimensions in millimetres  
 
Figure  B.1 — Layout, P hysical details including rated gross volume  and seal perimeter calculations of 
example ap pliance  
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  21 
 Table B.3 — Summary of volume calculation  
Compartment type  Rated gross volume,  
L Volume adjustment factor  
Ks Adjusted volume ( Vadj) 
Cellar  80 0.7 56 
Fresh food  185 1.0 185 
Chill 25 1.1 27.5 
Freeze r 90 1.6 144 
Total adjusted volume( Vadj tot) 412.5 litres  
 
B.6 Calculation of Base Energy Consumption and Star Rating Index, and 
determination of star ra ting 
The Base Energy Consumption is calculated as follows:  
Base Energy Consumption = Cf + (Cv x Vadj tot0.67) 
                                           = 150 + (8.8 x 412.50.67) 
                                           = 647.53 kWh/y  
From Clause 4.7 the Energy consumption Reduction Factor (ERF) is 0.23.  
The Star Rating Index is calculated as follows:  

1.544790.231log647.53562log
1 Index RatingStar
ee





 
From Table 4, the star rating is then determined to be 1.5.  
B.7 Calculation to check whether al l PAEC values are below MEPS cut-off 
B.7.1 General  
The model can be registered for MEPS if the energy consumption PAEC for each unit is be low the MEPS cut -
off level given by  
PAEC  < [Kf + (Kv x Vadj tot)] x Ka + Ad tot + Awi (kWh/y)  
The requirement for MEPS 2010 is that all units within a model  shall have an energy consumption that is less 
than the MEPS level.  
B.7.2 MEPS allowance factors  (Kf, Kv and Ka) 
From Table 5, the applicable MEPS cut -off level factors for Group 5T are as follows:  FDUS 900 -1:201 1 
22 © UN BS 201 1 – All rights reserved  
 a) fixed MEPS 2010 allowance factor ( Kf) = 334 kWh/y  
b) variable MEPS allowance factor ( Kv) = 0.384 kWh/y/L  
From Equation 8 in 5.5.1, Ka is 1.05, as the system is a daptive defrost.  
B.7.3 Door allowance  (Ad tot) 
The number of external doors of each food storage compartment type on the appliance and the number of 
external doors of each food storage type for the applicable regular arrangement (from Table 6) are shown in  
Table B .4. 
As there is a difference in the number of doors for one or more of the compartment food storage types, a door 
allowance will apply. The gasket actual lengths ( La) of the doors of the appliance are measured. The 
estimated gasket length ( Le) of a n equivalent regular Group 5T appliance with doors as specified in Table 6 is 
calculated using the method of Annex A (refer to Figure B .1). The difference between these lengths is 
calculated for each compartment type.  
Table B.4 —Regular door provisions and  equivalent gasket lengths  
Compartment type  Doors on appliance 
(Figure B.1)  
 Doors on appliance group 
(from Table 6 )  Gasket length , 
m 
Actual  
(La) Estimated for 
regular door 
provision  
(Le) Difference  
(La - Le) 
Cellar  1 0 56 0 1.92 
Fresh food  2 1 185 3.484  0.036  
Chill 1 0 27.5 0 1.0 
Freezer  1 1 144 2.12 0 
 
From Table 7, the door allowance factor for Group 5T is as follows:  
Door allowance factor Kd = 67 kWh/y/m.  
The door allowances for each compartment type are obtained using Equation 9. The sum of t hese is the door 
allowance for the appliance ( Ad tot). These calculations are summarized in Table B .5. 
Table B.5 — Door allowance calculations  
Compartment type  Difference in 
gasket length 
(La - Le), 
m Volume adjustment 
factor ( Ks) Door allowance factor (Kd) Door allowance (Ad) 
kWh/y  
Cellar  1.92 0.7 67 90.048  
Fresh food  -0.036  1.0 67 -2.412  
Chill 1.0 1.1 67 73.7 
Total Door allowance (Ad tot) 161.34kWh/y  
 
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  23 
 B.7.4 Ice dispenser allowance  (Awi) 
As the appliance has no through -the-door ice dispenser, no allo wance applies.  
B.7.5 Comparison of MEPS cut off and  PAEC AV 
The MEPS 2010 cut off for the appliance = [ Kf + (Kv x Vadj tot)] x Ka + Ad tot + Awi  
= [334 + (412.5 x 0.384) x 1.05 x 161.34 + 0  
= 678.36]  
 
PAEC  is 561.98, which is less than MEPS 2010 cut -off le vel of 678.36, so the model meets the MEPS 2010 
requirement.  FDUS 900 -1:201 1 
24 © UN BS 201 1 – All rights reserved  
 Annex C 
(informative)  
 
Determination of the maximum CEC value at which a model would 
qualify for a desired star rating  
C.1 General  
This annex presents two methods for determining the maximum valu e of the CEC ( CEC max) at which a 
refrigerating appliance model of a given group and total adjusted volume will qualify for a desired star rating.  
The first method entails the use of an equation and is exact. The second uses a conversion factor that is 
rounded so the resulting value would be an approximation.  
Equations provided in this annex  are for information only and do not take precedence over the equations 
provided in Clause 4  of this standard.  
C.2 Determination of  target CECmax by formula  
C.2.1 Method  
The maximum CEC to achieve a desired star rating of an appliance model of a given group and given total 
adjusted volume may be obtained from the following formula:  
CEC max = BEC x (1 - ERF)(Desired SRI - 1) …C.1  
CEC max = BEC x 0.77(Desired SRI - 1) …C.2  
where 
BEC is the B ase Energy Consumption  
ERF  is the E nergy consumption Reduction Factor.  
C.2.2 Example  
The product is a Group 4 refrigerating appliance with a freezer volume of 60 L and a fresh food volume of 190 
L. 
The desired star rating is 3.  
From Equatio n 2 and Table 1, the adjusted volume for each compartment is calculated as  follows:  
Vadj for freezer  = 60 × 1.6 = 96 L 
and 
Vadj for fresh food compartment  = 190 × 1.0  = 190 L. 
Therefore , 
Vadj total  = 286 litres . FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  25 
 From Equation 3 the base energy consumption is calculated as  follows:  
BEC = 150 + [8.8 × (286)0.67 ] = 539.27 kWh/y  
From 4.7, the energy consumption reduction factor (ERF) is 0.23.  
From Equation C .1, the CECmax is calculated as  follows:  
CEC max = 539.27 × (1 − 0.23)(3-1)  
= 539.27 × 0.772   
= 319.73 kWh/year  
C.3 Estimation of CEC max using a conversion factor m ethod  
C.3.1 Method  
An approximate value of the maximum CEC to achieve a desired star rating of an appliance model of a given 
group and given total adjust ed volume may be obtained from the following formula:  
Approximate CEC max = BEC x CF …C.3  
where  
BEC is the base energy consumption  
CF   is the conversion factor determined from Table C .1. 
Table C.1 — Conversion Factor (CF) for estimating maximum CEC directl y from Base Energy 
Consumption  
Star rating  CF all groups  
1 1.000  
1.5 0.877  
2 0.770  
2.5 0.676  
3 0.593  
3.5 0.520  
4 0.457  
4.5 0.401  
5 0.352  
5.5 0.308  
6 0.271  
 
C.3.2 Example  
The product and the desired star rating are the same as in C .2.2, that is,  FDUS 900 -1:201 1 
26 © UN BS 201 1 – All rights reserved  
 Desired star rating = 3  
Group = 4  
BEC = 539.27 kWh/y  
From Table C .1, the conversion factor is determined as  
CF = 0.593  
From Equation C .3, the approximate maximum allowable CEC is calculated as  
Approximate CEC max = 539.27 × 0.593 = 319.79 kWh/y  FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  27 
 Annex E 
(normative)  
 
Application for registration of a refrigerating appliance  for energy 
labeling and MEPS  
E.1 Introduction  
For registration of products for energy labeling and MEPS, applicants are required to provide the information 
set out in this annex . 
NOTE 1  The contact details supplied by applicants in this form may be used by other Government agencies to keep 
applicants informed of forthcoming regulatory changes that may affect the product registered under this standard. 
Otherwise, contact details are treated as private and confidential.  
NOTE 2  Notice of right to disclose information  — The information you submit on this application will be used for the 
purposes of assessing your application and the performance of statutory responsibilities.  
E.2 Scope  
This annex sets out an example of the required format for submitting an application for registration and listing 
with regulators.  
E.3 Guidance on the use of this  application f orm 
The standard and requirements to which the application is made should be indicated in  the application. 
Products sold in Uganda shall be registered for energy labeling and MEPS with the relevant regulator (refer 
Clause 6 ). 
E.4 Example o f online data required for ap plication  
Application for registration of an electrical refrigerating applian ce for energy efficiency  
(Please type or print)  
Section 1 Application details  
Name of applicant:   
Company name of applicant:   
Company Ugandan business number (if applicable):   
Company street address of applicant:   
Company postal address of applicant:   
Contact person:  
(A name, address and contact details for a person in Uganda shall 
be provided).  Name:  
Address:  
Position/title:  
Telephone:  
Facsimile:  FDUS 900 -1:201 1 
28 © UN BS 201 1 – All rights reserved  
 E-mail:  
Website:  
Section 2 Description of appliance  
Standard to which this product registr ation applies  
(Indicate correct answer)  FDUS 900 -1: 2010  
What is this application for?  MEPS and labelling  
Is the application for a single model or a family of models?  
(Indicate correct answer)  Single  Family  
This application is for approval to  
(Indicate  correct answer)  MEPS 2010 (FDUS 900 -1:2010)  
Brand name:   
Model numbers:  
(List all models covered by this application. This can be either a 
number or name or combination of the two that will identify the 
particular product. Add additional rows if more th an 10 models).   
Model 1:  
Model 2:  
Model 3:  
Model 4:  
Model 5:  
Model 6:  
Model 7:  
Model 8:  
Model 9:  
Model 10:  
Family model numbers, if applicable, for above models:  
  
Model/family number(s) to appear on the rating label/s:  
Note: Must be one of the above two.  Each individual model listed above  
The family model number listed above  
Does this model or family replace or supplement another with 
the same CEC and SRI?  
(Indicate correct answer).  Yes  No 
If yes, indicate relevant details:  Model n ame Model number  Registration no.  
Country of manufacture:   
In what countries are these models to be sold?  
(Indicate each country).  Uganda  
Other, please specify  
Year and month in which the model will be/was first available 
in Uganda  Year:  Month:  
Date of  manufacture information:  
It will be possible to determine the date of manufacture information of each appliance from information legibly and durably 
marked on the appliance (refer to 6.1.4). Applicants shall complete one of the two questions below:  
If the date of manufacture is marked in a non -encrypted 
format, provide a description of the date format clearly 
identifying which components indicate the day (if included), 
month and year of manufacture:   FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  29 
 If the date of manufacture is marked in an encrypted f ormat, 
provide details of how the date of manufacture can be 
determined so that the decoded information clearly identifies 
which components indicate the day  
(if included), month and year of manufacture:  
NOTE  The date of manufacture encryption method 
inform ation provided in answer to this question is not 
intended to be made public. The information must be 
adequate to enable the date of manufacture to be determined 
without further reference to the manufacturer or supplier.   
Section 3 Testing and test report  
Is a test report attached?  
(Indicate correct answer).  Yes No 
If no test report is attached note the source registration 
number of the appliance upon which this application relies for 
its test report:  
(Proceed to Section 4 if no report attached).   
Test l aboratory type:  
(Indicate correct answer).  Own 'in -house' laboratory  Independent laboratory  
Test laboratory name:   
Test laboratory address:   
Test laboratory location:  
(Indicate correct answer).   
Test laboratory accreditation:   
Test standard used:  
(Indicate correct answer).  FDUS 900 -2 
Test voltage:  
(Indicate correct answer).  
NOTE  Only 230 V is permitted under FDUS 900 -2. 230 V a.c.  240 V a.c.  
Test report number(s) and date(s):  Report number(s):  
Report date(s):  
Section 4 Specific Appliance details  
Appliance dimensions  
(Advisory only).  Width (mm)   Height (mm)  Depth (mm)  
Designation:  
(Indicate correct answer).  Refrigerator  
Refrigerator/ freezer  
Freezer  
Cooled appliance  
Is this appliance designed specifically for the storage and 
maturation of wine?  
Configuration:  
(Indicate correct answer).  Upright  Chest  Side-by-side 
Group as defined in FDUS 900 -2 1 2 3 4 5T 5B 5S 6C 6U 7 FDUS 900 -1:201 1 
30 © UN BS 201 1 – All rights reserved  
 (Indicate correct answer).  
Can this product be configured to operate as more than one 
group? If yes, complete a separate applicat ion for each group 
being registered and contact your regulator regarding fees.  Yes No 
Total number of compartments:   
 
Total adjusted volume (refer to 4.5)  
Record, in the table below, the measured, calculated and otherwise determined values as applicable.  
Compartment  
number  Compartment  
type 
(see Note 1)  Compartment  
storage 
volume , 
L Compartment  
gross volume , 
L Compartment  
claimed max.  
operating  
temperature , 
°C 
(see Note 2)  Compartment  
volume  
adjusted  
factor , Ks 
(see Note 3)  Compartment  
adjusted  gross 
volume, Vadj 
L 
1       
2       
3       
4       
5       
6       
Total adjusted gross v olume (litres)   
Insert additional rows in this table if more than 6 compartments.  
NOTE 1 Compartment types may be chosen from those defined in FDUS 900 -2. 
NOTE 2 For s pecial compartments only specify the maximum operating temperature as per FDUS 900 -2. 
NOTE 3 Insert the applicable volume adjustment factor as in 4.5 of this standard.  
 
Test results  
Projects Annual Energy Consumption (PAEC) – Unit 1                                           kWh/y  
Projects Annual Energy Consumption (PAEC) – Unit 2  kWh/y  
Projects Annual Energy Consumption (PAEC) – Unit 3  kWh/y  
Does the product have an operating mode which reduces energy 
consumption under energy test conditions (including m anagement of 
heaters) but which is not generally saving energy during normal 
use? (refer to 4.3) Yes No 
If yes, report the value of Pr = the average power reduction resulting 
from the energy reduction mode, in watts (refer to Equation 2)   
Projected Annua l Energy Consumption ( PAEC av) – 
Average  kWh/y  
CEC (kWh/y) ( refer to  4.4) 
NOTE CEC is only valid if less than the MEPS level (refer to 5.5). 
A warning may be issued where the standard deviation (coefficient 
of variation) of the 3 units submitted is greater  than 5  %. kWh/y  
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  31 
 Base Energy Consumption ( refer to 4.6)  
Fixed allowance factor Cf:  
Variable allowance factor Cv:  
Variable allowance factor × Vadj tot:  
Base Energy  Consumption, BEC :  
Star Rating Index , SRI: 
(Calculate using Equation 5 in 4.7)   
Star Rating:  
(Calculate using Table 4 in 4.8)   
 
Pull down performance compliance  
Refer to Clause 5  of FDUS 900 -2 for compliance requirements.  
A test report that substantiates pull down performance compliance of a single unit is required (refer to Clause 
6). This shall be in the format specified in FDUS 900 -2. 
Pull down performance............. ........................................ C omplies? Yes/No  
Operating temperature performance compliance  
Refer to Clause 5  of FDUS 900 -2 for compliance requirements.  
A tes t report that substantiates operating temperature performance compliance of a single unit is required 
(refer to Clause 6 ). This shall be in the format specified in FDUS 900 -2. 
Operating temperature performance........... ................ C omplies ? Yes/No 
Temperature variation compliance  
Does the product comply with Clause 5.7.3(a) ( FDUS 900 -2):  Yes    No 
Does the product comply with Clause 5.7.3(b) ( FDUS 900 -2):  Yes    No 
Does the product comply with Clause 5.7.3(c) ( FDUS 900 -2):  Yes    No 
Door allowance  
Record in the table below, the number of external doors of each compartment type on the appliance and, 
where these numbers are different, the number of external doors described in Table 6, for the appliance 
group. Include any multi -use-type compartment as the type applicable when its coldest use is selected.  
On an upright appliance where, for any compartment storage type, the number of doors on the appliance 
differs from the number of doors specified in Table 6, a door allowance applies and door gasket data  are 
required as follows:  
NOTE For multi -use compartments, if any, include each as being the coldest of the food storage types claimed.  FDUS 900 -1:201 1 
32 © UN BS 201 1 – All rights reserved  
  
Compartment type  Doors on  
appliance  Regular door  
provisions for  
appliance group  
(refer to  Table 6) Gasket length, metr es 
Actual  
(La) Estimated for  
regular door  
provision  
(Le) Difference  
(La – Le) 
Cellar   0  0  
Fresh food       
Chill  0  0  
Special (unfrozen)   0  0  
Ice-making   0  0  
Short -term frozen  
food  0  0  
Freezer       
Special (frozen)   0  0  
Total numbe r of 
external doors       
 
Where a door allowance is required, record, from Table 7 the door allowance factor for the product group.  
DOOR ALLOWANCE FACTOR......................................................................... kWh/y/m  
Also for each compar tment type, record, in the Table below, the difference in gasket length and whether it is 
positive or negative and the applicable volume adjustment factor from clause 4.5. Then multiply the gasket 
length difference by this factor and by the door allowance factor to obtain a set of door allowances for all 
applicable compartment types.  
Each of these may be either positive or negative. The net sum of these is the door allowance for the appliance 
Ad tot. 
Compartment type  Difference in 
gasket  length  
(La – Le), metres  
 Volume adjustment  
factor  (Ks) Door  allowance  
factor  (Kd) Door  allowance  (Ad) 
kWh/y  
Cellar      
Fresh food      
Chill     
Special (unfrozen)      
Short -term frozen food      
Ice-making      
Freezer      
Special (frozen)      
Total door allowance  (Ad tot)  
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  33 
 Ice dispenser allowance  
If the appliance has a through -the-door ice dispenser, either with or without an associated cold water 
dispenser, an additional allowance for MEPS applies.  
Ice dispenser allowance of  128 kWh/y ...................A pplies/ Does not apply  
(indicate correct answer)  
Adaptive defrost  
Does the unit have any form of variable defrost control cycle other than one determined by compressor run -
time alone?  
NOTE Such a system should be indicated where present. Where an adaptive defrost M EPS allowance is claimed, 
further information as set out below must be supplied.  
Yes       No 
Is an adaptive defrost MEPS allowance being claimed?  
Where an adaptive defrost MEPS allowance is claimed, the product shall meet the adaptive defrost 
requirements  of FDUS 900 -2. 
Yes        No 
Where an adaptive defrost MEPS allowance is claimed, complete the following:  
(i) Does the product comply with Clause 3.3.7(b)(i) ( FDUS 900 -2)? – All defrost control cycles > 24 h for 
energy tests  
Yes        No 
(ii) Does the pr oduct comply with Clause 3.3.7(b)(ii) (DUS 900 -2) – Appliance is capable for a defrost control 
cycle > 36 h while maintaining energy target temperatures in a 32  °C ambient  
Yes        No 
With respect to Clause 3.3.7(b)(ii) (DUS 900 -2) provide information in  the application that demonstrates the 
adaptive nature of the defrost system. Such information  could include a sequence of events and any learning 
period required and other information which would activate the adaptive frost system and allow a third party 
laboratory to verify the claim.  
NOTE This information can be provided as a separate attachment. The type of information that may be required 
could include items such as control settings, learning period, learning environment (ambient temperatures), if any learning 
be done outside of a test room if operating history is lost, if the power supply is interrupted. Indication of the longest an d 
shortest time between defrosts (in hours) and the sequence of events to cause the shortest possible defrost time may als o 
be provided.  
With respect to Clause 3.3.7(b)(iii) (DUS 900 -2) indicate which of the following parameters are used to 
significantly alter the time between defrosts:  
 door opening count ; 
 interval between door openings ; 
 duration of door openings ; 
 defrost hea ter on -time history ; FDUS 900 -1:201 1 
34 © UN BS 201 1 – All rights reserved  
  time between previous defrosts ; 
 compressor run time/compressor speed ; 
 amount of accumulated frost ; 
 ambient temperature range ; 
 ambient humidity range ; and  
 other (specify) . 
Complies with MEPS requirement:  
(Indicate correct answer)  MEPS 2 010 
Appliance group  
Refer to FDUS -900-2  
Fixed MEPS allowance factor: ( Kf) 
Refer to Table 5 (kWh/y)  
Variable MEPS allowance factor: ( Kv) 
Refer to Table 5 (kWh/y/L)  
Adaptive defrost adjustment factor: ( Ka)  
Adjusted volume   
Total door allowance   
Ice dispenser allowance (kWh/y)   
MEPS cut -off level  
(Refer to Equation 8)  
PAEC av  
 
Application is valid only if the PAECs for all three units tested are less than the MEPS cut -off level (refer to 
5.5). A warning may be issued where any of the units tested lie within 3  % of the MEPS 2010 requirement.  
Appliance complies /does not comply  (indicate correct answer)  
Section 5 Declaration  
I declare that the details stated above are correct.  
I acknowledge that the current version of the Administrative Guidelines ( /  / ) will be applied to this registration 
for energy labeling and MEPS (plus link to current version) (current date from website).  
Signature of applicant: ...................................................... Date: ..................................  
 
 
Office use only:  
 
Date received: ........................................... Registration number:.............................  
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  35 
 Bibliography  
[1] ISO 5155 , Household refrigerating appliances – Frozen food storage cabinets and food freezers -
Characteristics and te st methods  
[2] ISO 7371 , Household refrigerating appliances - Refrigerators with or without low -temperature 
compartment - Characteristics and test methods  
[3] ISO 8187 , Household refrigerating appliances — Refrigerator -freezers— Characteristics and test 
methods  
[4] ISO 8561 , Household frost -free refrigerating appliances - Refrigerators, refrigerator -freezers, 
frozen food storage cabinets and food freezers cooled by internal forced air circulation -
Characteristics and test methods  
[5] ISO 15502 , Household refrigerating appli ances -Characteristics and test methods  
 FDUS 900 -1:201 1 
© UNBS 201 1 – All rights reserved  37 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjun ction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with t he 
certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 FDUS 900 -1:201 1   
 
ICS nn.nnn.nn  
Price based o n nn pages  
© UNBS 201 1 – All rights reserved