CHAPTER 9. TRIAL STANDARD LEVELS

TABLE OF CONTENTS

**9.1 INTRODUCTION** 

**.............................................................................................................. 9­1** 

**9.2 TRIAL**  **STANDARD LEVELS** 

**.......................................................................................... 9­1** 

**9.3 ENERGY­EFFICIENCY**  **EQUATIONS............................................................................ 9­4**

**9.3.1 Existing**  **Federal Energy­Efficiency**  **Equations for**  **PTACs and**  **PTHPs and**  **the**

**Energy­Efficiency Equations**  **in ASHRAE**  **Standard 90.1­1999**  **in the**  **Cooling Mode** 

**...... 9­5** 

**9.3.2 Revised**  **Energy­Efficiency Equations**  **for Standard**  **Size PTACs**  **and PTHPs**  **in the** 

**Cooling Mode** 

**..................................................................................................................... 9­6** 

**9.3.3 Rationale**  **for Revised**  **Slope of**  **TSL A**  **for Standard**  **Size PTACs**  **and PTHPs**  **in the** 

**Cooling Mode** 

**..................................................................................................................... 9­8** 

**9.3.4 Revised**  **Energy­Efficiency Equations**  **for Non­Standard**  **Size PTACs**  **and PTHPs** 

**in the**  **Cooling Mode** 

**......................................................................................................... 9­10** 

**9.3.5 Existing**  **Federal Energy­Efficiency**  **Equations for**  **PTACs and**  **PTHPs and**  **the**

**Energy­Efficiency Equations**  **in ASHRAE**  **Standard 90.1­1999**  **in the**  **Heating Mode** 

**.... 9­14** 

**9.3.6 Revised**  **Energy­Efficiency Equations**  **for Standard**  **Size and**  **Non­Standard Size** 

**PTACs and**  **PTHPs in**  **the Heating**  **Mode.......................................................................... 9­16** 

LIST OF TABLES

**Table 9.2.1**  **Standard Size**  **Equipment Baseline**  **Efficiency Levels**  **and TSLs** 

**............................ 9­3** 

**Table 9.2.2 Non­Standard Size Equipment Baseline Efficiency Levels and TSLs.................... 9­4** 

**Table 9.3.1**  **Existing Federal**  **Energy Conservation**  **Standards for**  **PTACs and**  **PTHPs**

**(Cooling Mode)....................................................................................................**  **9­5**

**Table 9.3.2**  **ASHRAE/IESNA Standard**  **90.1­1999 Energy**  **Efficiency Levels**  **for PTACs** 

**and PTHPs**  **(Cooling Mode).................................................................................**  **9­6**

**Table 9.3.3**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by**  **TSL**

**for Standards**  **Size PTACs** 

**................................................................................... 9­7** 

**Table 9.3.4**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by**  **TSL**

**for Standard**  **Size PTHP....................................................................................... 9­7** 

**Table 9.3.5**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of**  **Cooling**

**Capacity) by**  **TSL for**  **Non­Standard Size**  **PTAC............................................... 9­11** 

**Table 9.3.6**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of**  **Cooling**

**Capacity) by**  **TSL for**  **Non­Standard Size**  **PTHP**

**............................................... 9­12** 

**Table 9.3.7 Existing Federal Energy Conservation Standards for PTHPs (Heating Mode)..... 9­15** 

**Table 9.3.8**  **ASHRAE/IESNA Standard**  **90.1­1999 Energy­Efficiency**  **Levels for**  **PTHPs**

**(Heating Mode).................................................................................................. 9­16** 

**Table 9.3.9**  **Energy­Efficiency Equations**  **for Heating**  **Mode (COP**  **as a**  **Function of**  **Cooling**

**Capacity) by**  **TSL for**  **Standard Size**  **PTHP**

**....................................................... 9­17** 

**Table 9.3.10**  **Energy­Efficiency Equations**  **for Heating**  **Mode (COP**  **as a**  **Function of** 

**Cooling Capacity)**  **by TSL**  **for Non­Standard**  **Size PTHP** 

**................................. 9­17** 

**9­i**LIST OF FIGURES

**Figure 9.3.1**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by** 

**TSL for**  **Standard Size**  **PTACs and**  **2008 AHRI**  **Directory Equipment** 

**............... 9­9** 

**Figure 9.3.2**  **Energy­Efficiency Equations**  **(EER as**  **a Function**  **of Cooling**  **Capacity) by** 

**TSL for Standard**  **Size PTHPs**  **and 2008**  **AHRI Directory Equipment.............. 9­10**

**Figure 9.3.3**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of** 

**Cooling Capacity)**  **by TSL**  **for Non­Standard**  **Size PTACs**  **and 2008**  **AHRI**

**Directory Equipment..........................................................................................**  **9­13**

**Figure 9.3.4**  **Energy­Efficiency Equations**  **for Cooling**  **Mode (EER**  **as a**  **Function of** 

**Cooling Capacity)**  **by TSL**  **for Non­Standard**  **Size PTHPs**  **and 2008**  **AHRI**

**Directory Equipment..........................................................................................**  **9­14**

**9­ii**CHAPTER 9. TRIAL STANDARD LEVELS

9.1 INTRODUCTION

**The current**  **Federal minimum**  **energy conservation**  **standards for**  **packaged terminal**  **air**

**conditioners (PTACs)**  **and packaged**  **terminal heat**  **pumps (PTHPs)**  **and the**  **efficiency**

**requirements specified**  **by the**  **American Society**  **of Heating,**  **Refrigerating, and**  **Air­Conditioning**

**Engineers (ASHRAE)**  **and the**  **Illuminating Engineering**  **Society of**  **North America**  **(IESNA)**

**Standard 90.1­1999,**  **“** Energy Standard for Buildings Except Low­Rise Residential Buildings,”

**(ASHRAE/IESNA Standard**  **90.1­1999) are**  **expressed in**  **terms of**  **an energy­efficiency** 

**equations. For**  **the PTAC**  **and PTHP**  **equipment classes**  **with a**  **cooling capacity**  **greater than**  **or**

**equal to**  **7,000 British**  **thermal units**  **per hour**  **(Btu/h) and**  **less than**  **or equal**  **to 15,000**  **Btu/h, the** 

**energy­efficiency equation**  **characterizes the**  **relationship between**  **the energy**  **efficiency ratio** 

**(EER) of**  **the equipment**  **and cooling**  **capacity (i.e.,**  **EER is**  **a function**  **of the**  **cooling capacity**  **of**

**the equipment).**  **For all**  **cooling capacities**  **less than**  **7,000 Btu/h**  **and all**  **cooling capacities**  **greater**

**than 15,000**  **Btu/h, the**  **EER is**  **calculated by**  **substituting either**  **of the**  **two capacities,**  **7,000 Btu/h** 

**or 15,000**  **Btu/h, in**  **the energy­efficiency**  **equation. This**  **chapter describes**  **the methodology**  **used**

**by DOE**  **to derive**  **the energy­efficiency**  **equations for**  **PTAC and**  **PTHP equipment.** 

9.2 TRIAL STANDARD LEVELS

**For the**  **subsequent analyses,**  **DOE refers**  **to the**  **grouping of**  **efficiency levels**  **for each** 

**equipment class**  **as trial**  **standard levels**  **(TSLs). The**  **TSLs are**  **identical to**  **the efficiency**  **levels**

**examined in**  **the engineering**  **analysis, energy**  **use characterization**  **analysis and**  **the life­cycle**  **cost**

**(LCC) and**  **payback period**  **analyses (PBP).**  **Table 9.2.1**  **and For**  **standard size**  **PTACs and** 

**PTHPs, the**  **baseline efficiency**  **levels are**  **the efficiency**  **levels specified**  **by ASHRAE**  **Standard**

**90.1­1999. TSLs**  **1, 3,**  **and 5**  **represent matched**  **pairs of**  **efficiency levels**  **for the**  **two**

**representative cooling**  **capacities of**  **standard size**  **PTACs and**  **PTHPs. In**  **other words,**  **the**

**efficiency levels**  **for PTACs**  **and PTHPs**  **with the**  **same cooling**  **capacity and**  **wall sleeve** 

**dimensions are**  **equivalent for**  **these three**  **TSLs. DOE**  **maintained the**  **0.7 EER**  **decrement**

**established by**  **ASHRAE Standard**  **90.1­1999 between**  **the efficiency**  **levels of**  **the standard**  **size**

**equipment with**  **cooling capacities**  **of 9,000**  **Btu/h and**  **12,000 Btu/h.**  **TSL 6**  **represents the**  **max**

**tech efficiency**  **levels utilizing**  **R­410A as**  **described in**  **Chapter 5**  **of the**  **TSD.**

**After examining**  **preliminary results**  **of the**  **LCC analysis**  **(see Chapter**  **8 of**  **the TSD),** 

**DOE developed**  **two additional**  **TSLs, TSL**  **2 and**  **TSL 4,**  **based on**  **the large**  **differences in**  **LCC**

**savings results**  **between PTACs**  **and PTHPs.**  **TSL 2**  **and TSL**  **4 combine**  **different efficiency** 

**pairings between**  **PTACs and**  **PTHPs. In**  **other words,**  **DOE examined**  **the impacts**  **of amended** 

**energy conservation**  **standards when**  **PTACs and**  **PTHPs are**  **required to**  **meet different**  **efficiency**

**levels. For**  **TSL 2,**  **DOE combined**  **TSL 1**  **for PTACs**  **and TSL**  **3 for**  **PTHPs. For**  **TSL 4,**  **DOE**

**combined TSL**  **1 for**  **PTACs and**  **TSL 5**  **for PTHPs.**  **These two**  **combination levels**  **serve to** 

**maximize LCC**  **savings, while**  **recognizing the**  **differences in**  **LCC results**  **for PTACs**  **and PTHPs.** 

**Lastly, DOE**  **added a**  **TSL A**  **in the**  **final rule**  **analysis for**  **standard size**  **PTACs and** 

**PTHPs. TSL**  **A combines**  **the efficiency**  **levels in**  **TSL 3**  **and TSL**  **1 for**  **standard size**  **PTACs at** 

**the representative**  **cooling capacities**  **and the**  **efficiency levels**  **in TSL**  **5 and**  **TSL 3**  **for standard** 

**size PTHPs**  **at the**  **representative cooling**  **capacities. DOE's**  **inclusion of**  **TSL A**  **recognizes the** 

**9­1 challenge**  **manufacturers encounter**  **when increasing**  **the efficiency**  **of larger**  **cooling capacity** 

**equipment.**

**Table 9.2.2**  **present the**  **analyzed efficiency**  **levels as**  **TSLs for**  **standard size**  **and non** 

**standard size**  **PTACs and**  **PTHPs for**  **the final**  **rule.**

**9­2**Table 9.2.1 Standard Size Equipment Baseline Efficiency Levels and TSLs

Equipment

Class

(Cooling

Capacity a ) Efficiency

Metric b Baseline

(ASHRAE/IESNA

Standard 90.1­1999) TSL

1 TSL

2 TSL

3 TSL

A TSL

4 TSL

5 TSL 6

(MaxTech)

**Standard Size** 

**PTAC EER**  **10.6 10.9**  **10.9 11.1**  **11.1 10.9**  **11.3 11.5** 

**(9,000 Btu/h)** 

**Standard Size** 

**PTAC EER**  **9.9 10.2**  **10.2 10.4**  **10.2 10.2**  **10.6 10.8** 

**(12,000 Btu/h)** 

**Standard Size** 

**PTHP**

**(9,000 Btu/h)**  **EER**

**COP 10.4** 

**3.0 10.9** 

**3.1 11.1** 

**3.2 11.1** 

**3.2 11.3** 

**3.3 11.3** 

**3.3 11.3** 

**3.3 11.5** 

**3.3**

**Standard Size** 

**PTHP**

**(12,000 Btu/h)**  **EER**

**COP 9.7** 

**2.9 10.2** 

**3.0 10.4** 

**3.1 10.4** 

**3.1 10.4** 

**3.1 10.6** 

**3.1 10.6** 

**3.1 10.8** 

**3.1**

**For standard**  **size PTACs**  **and PTHPs,**  **the baseline**  **efficiency levels**  **are the**  **efficiency**

**levels specified**  **by ASHRAE**  **Standard 90.1­1999.**  **TSLs 1,**  **3, and**  **5 represent**  **matched pairs**  **of**

**efficiency levels**  **for the**  **two representative**  **cooling capacities**  **of standard**  **size PTACs**  **and**

**PTHPs. In**  **other words,**  **the efficiency**  **levels for**  **PTACs and**  **PTHPs with**  **the same**  **cooling**

**capacity and**  **wall sleeve**  **dimensions are**  **equivalent for**  **these three**  **TSLs. DOE**  **maintained the** 

**0.7 EER**  **decrement established**  **by ASHRAE**  **Standard 90.1­1999**  **between the**  **efficiency levels** 

**of the**  **standard size**  **equipment with**  **cooling capacities**  **of 9,000**  **Btu/h and**  **12,000 Btu/h.**  **TSL 6** 

**represents the**  **max­tech efficiency**  **levels utilizing**  **R­410A as**  **described in**  **Chapter 5**  **of the**  **TSD.**

**After examining**  **preliminary results**  **of the**  **LCC analysis**  **(see Chapter**  **8 of**  **the TSD),** 

**DOE developed**  **two additional**  **TSLs, TSL**  **2 and**  **TSL 4,**  **based on**  **the large**  **differences in**  **LCC**

**savings results**  **between PTACs**  **and PTHPs.**  **TSL 2**  **and TSL**  **4 combine**  **different efficiency** 

**pairings between**  **PTACs and**  **PTHPs. In**  **other words,**  **DOE examined**  **the impacts**  **of amended** 

**energy conservation**  **standards when**  **PTACs and**  **PTHPs are**  **required to**  **meet different**  **efficiency**

**levels. For**  **TSL 2,**  **DOE combined**  **TSL 1**  **for PTACs**  **and TSL**  **3 for**  **PTHPs. For**  **TSL 4,**  **DOE**

**combined TSL**  **1 for**  **PTACs and**  **TSL 5**  **for PTHPs.**  **These two**  **combination levels**  **serve to** 

**maximize LCC**  **savings, while**  **recognizing the**  **differences in**  **LCC results**  **for PTACs**  **and PTHPs.** 

**Lastly, DOE**  **added a**  **TSL A**  **in the**  **final rule**  **analysis for**  **standard size**  **PTACs and** 

**PTHPs. TSL**  **A combines**  **the efficiency**  **levels in**  **TSL 3**  **and TSL**  **1 for**  **standard size**  **PTACs at** 

**the representative**  **cooling capacities**  **and the**  **efficiency levels**  **in TSL**  **5 and**  **TSL 3**  **for standard** 

**size PTHPs**  **at the**  **representative cooling**  **capacities. DOE's**  **inclusion of**  **TSL A**  **recognizes the** 

**challenge manufacturers**  **encounter when**  **increasing the**  **efficiency of**  **larger cooling**  **capacity**

**equipment.**

**a Cooling**  **capacities are**  **expressed in**  **British thermal**  **unit per**  **hour (Btu/h).** 

**b According**  **to the**  **Air­Conditioning and**  **Refrigeration Institute**  **(ARI) 310/380­2004**  Standard for Packaged

Terminal Air­Conditioners and Heat Pumps **(ARI 310/380­2004)**  **test procedure,**  **energy­efficiency ratio**  **(EER) is** 

**defined as**  **“the ratio**  **of the**  **produced cooling**  **effect of**  **an air**  **conditioner or**  **heat pump**  **to its**  **net work**  **input,**

**expressed in**  **Btu/watt­hour.”**

**9­3**Table 9.2.2 Non­Standard Size Equipment Baseline Efficiency Levels and TSLs

Equipment

Class

(Cooling

Capacity) Efficiency

Metric c Baseline

(ASHRAE/IESNA

Standard 90.1­1999) TSL

1 TSL

2 TSL

3 TSL

4 TSL

5

(MaxTech)

**Non­Standard**

**Size PTAC**  **EER 8.6**  **9.4 9.4**  **9.7 9.4**  **10.0**

**(11,000 Btu/h)** 

**Non­Standard**

**Size PTHP** 

**(11,000 Btu/h)**  **EER**

**COP 8.5** 

**2.6 9.4** 

**2.8 9.7** 

**2.8 9.7** 

**2.8 10.0** 

**2.9 10.0** 

**2.9**

**For non­standard**  **size PTACs**  **and PTHPs,**  **the baseline**  **efficiency levels**  **are the**  **efficiency**

**levels specified**  **by ASHRAE**  **Standard 90.1­1999.**  **TSLs 1**  **and 3**  **represent matched**  **pairs of** 

**efficiency levels**  **for the**  **representative cooling**  **capacity of**  **non­standard size**  **PTACs and**  **PTHPs.**

**In other**  **words, the**  **efficiency levels**  **for PTACs**  **and PTHPs**  **with the**  **same cooling**  **capacity are** 

**equivalent for**  **these two**  **TSLs. TSL**  **5 represents**  **the max­tech**  **efficiency levels**  **utilizing R­410A** 

**as described**  **in Chapter**  **5 of**  **the TSD.** 

**After examining**  **preliminary results**  **of the**  **LCC analysis**  **(see Chapter**  **8 of**  **the TSD),** 

**DOE developed**  **two additional**  **TSLs, TSL**  **2 and**  **TSL 4,**  **based on**  **the large**  **differences in**  **LCC**

**savings results**  **between PTACs**  **and PTHPs.**  **TSL 2**  **and TSL**  **4 combine**  **different efficiency** 

**pairings between**  **PTACs and**  **PTHPs. In**  **other words,**  **DOE examined**  **the impacts**  **of amended** 

**energy conservation**  **standards when**  **PTACs and**  **PTHPs are**  **required to**  **meet different**  **efficiency**

**levels. For**  **TSL 2,**  **DOE combined**  **TSL 1**  **for PTACs**  **and TSL**  **3 for**  **PTHPs. For**  **TSL 4,**  **DOE**

**combined TSL**  **1 for**  **PTACs and**  **TSL 5**  **for PTHPs.**  **These two**  **combination levels**  **serve to** 

**maximize LCC**  **savings, while**  **recognizing the**  **differences in**  **LCC results**  **for PTACs**  **and PTHPs.** 

9.3 ENERGY­EFFICIENCY EQUATIONS

**The following**  **sections describe**  **the methodology**  **DOE used**  **to develop**  **the energy** 

**efficiency equations**  **for each**  **TSL. To**  **develop the**  **energy­efficiency equations**  **in terms**  **of EER** 

**and cooling**  **capacity, DOE**  **used a**  **linear regression,**  **the efficiency**  **levels for**  **each TSL,**  **or**

**components of**  **the existing**  **ASHRAE Standard**  **90.1­1999 energy­efficiency**  **equations.**

**c Coefficient**  **of performance**  **(COP) is**  **defined by**  **ARI 310/380­2004**  **as “the**  **ratio of**  **the produced**  **cooling effect**  **of**

**an air**  **conditioner or**  **heat pump**  **(or its**  **produced heating**  **effect, depending**  **on the**  **mode of**  **operation) to**  **its net**  **work**

**input, when**  **both the**  **cooling (or**  **heating) effect**  **and the**  **net work**  **input are**  **expressed in**  **identical units**  **of**

**measurement.”**

**9­4**9.3.1 Existing Federal Energy­Efficiency Equations for PTACs and PTHPs and the

Energy­Efficiency Equations in ASHRAE Standard 90.1­1999 in the Cooling Mode

**As stated**  **in the**  **engineering analysis**  **(see Chapter**  **5 of**  **this TSD),**  **current Federal**  **energy**

**conservation standards**  **and the**  **efficiency levels**  **specified by**  **ASHRAE Standard**  **90.1­1999 for** 

**PTACs and**  **PTHPs in**  **the cooling**  **mode are**  **a function**  **of the**  **equipment’s cooling**  **capacity. Both** 

**standards specify**  **requirements in**  **the form**  **of energy­efficiency**  **equations to**  **calculate the**  **EER**

**based on**  **the equipment’s**  **cooling capacity**  **for PTACs**  **and PTHPs**  **with a**  **cooling capacity**  **greater**

**than or**  **equal to**  **7,000 Btu/h**  **and less**  **than or**  **equal to**  **15,000 Btu/h**  **for each**  **equipment class.** 

**Table 9.3.1**  **and Table**  **9.3.2 show**  **the current**  **Federal energy**  **conservation standards**  **and**

**efficiency levels**  **specified by**  **ASHRAE Standard**  **90.1­1999 for**  **PTACs and**  **PTHPs in**  **the**

**cooling mode,**  **respectively.**

Table 9.3.1 Existing Federal Energy Conservation Standards for PTACs and PTHPs

(Cooling Mode)

Equipment Class Existing Federal

Energy Conservation Standards* Equipment Cooling Capacity

**PTAC <7,000**  **Btu/h EER** 

**= 8.88** 

**>7,000 Btu/h**  **and**

**<15,000 Btu/h**  **EER**

**= 10.0** 

**– (0.16**  **x Cap** )**

**>15,000 Btu/h**  **EER**

**= 7.6** 

**PTHP <7,000**  **Btu/h EER** 

**= 8.88** 

**>7,000 Btu/h**  **and**

**<15,000 Btu/h**  **EER**

**= 10.0** 

**– (0.16**  **x Cap** )**

**>15,000 Btu/h**  **EER**

**= 7.6** 

***** **For equipment**  **rated according**  **to the**  **Air­Conditioning and**  **Refrigeration Institute**  **(ARI) standards,**  **all EER**  **values**

**must be**  **rated at**  **95oF outdoor**  **dry­bulb temperature**  **for air­cooled**  **products and**  **evaporatively­cooled products**  **and at** 

**85oF entering**  **water temperature**  **for water**  **cooled products.** 

****** **Cap means**  **cooling capacity**  **in kBtu/h**  **at 95oF**  **outdoor dry­bulb**  **temperature.**

**9­5**Table 9.3.2 ASHRAE/IESNA Standard 90.1­1999 Energy Efficiency Levels for PTACs and

PTHPs (Cooling Mode)

Equipment Class Proposed Energy

Conservation Standards * Equipment Category Cooling

Capacity

**PTAC Standard**  **Size** ****** **<7,000 Btu/h**  **EER**

**= 11.0** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 12.5** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 9.3** 

**Non­Standard Size**  † **<7,000 Btu/h**  **EER**

**= 9.4** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 10.9** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 7.7** 

**PTHP Standard**  **Size** ****** **<7,000 Btu/h**  **EER**

**= 10.8** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 12.3** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 9.1** 

**Non­Standard Size**  † **<7,000 Btu/h**  **EER**

**= 9.3** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **EER**

**= 10.8** 

**– (0.213**  **x Cap**  **†† )** 

**>15,000 Btu/h**  **EER**

**= 7.6** 

***** **For equipment**  **rated according**  **to ARI**  **standards, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **greater than**  **or equal**  **to 16**  **inches**

**high, or**  **greater than**  **or equal**  **to 42**  **inches wide.** 

**† Non­standard**  **size refers**  **to PTAC**  **or PTHP**  **equipment with**  **wall sleeve**  **dimensions less**  **than 16**  **inches high**  **and**

**less than**  **42 inches**  **wide. ASHRAE/IESNA**  **Standard 90.1­1999**  **also includes**  **a factory**  **labeling requirement**  **for**

**non­standard size**  **PTAC and**  **PTHP equipment**  **as follows:**  **“MANUFACTURED FOR**  **REPLACEMENT**

**APPLICATIONS ONLY;**  **NOT TO**  **BE INSTALLED**  **IN NEW**  **CONSTRUCTION PROJECTS.”** 

**†† Cap**  **means cooling**  **capacity in**  **kBtu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

9.3.2 Revised Energy­Efficiency Equations for Standard Size PTACs and PTHPs in the

Cooling Mode

**To derive**  **the energy­efficiency**  **equations corresponding**  **to the**  **various TSLs**  **(i.e.,**

**efficiency level**  **as a**  **function of**  **cooling capacity)**  **for standard**  **size PTACs**  **and PTHPs,**  **DOE**

**plotted the**  **representative cooling**  **capacities and**  **the corresponding**  **efficiency levels**  **for each** 

**TSL. DOE**  **then calculated**  **the equation**  **of the**  **line passing**  **through the**  **EER values**  **for 9,000** 

**Btu/h and**  **12,000 Btu/h**  **for standard**  **size PTACs**  **and PTHPs.** 

**For standard**  **size PTACs**  **and PTHPs**  **with cooling**  **capacity less**  **than 7,000**  **Btu/h, DOE** 

**determined the**  **corresponding EER**  **value using**  **a cooling**  **capacity of**  **7,000 Btu/h**  **in the**  **energy**

**efficiency equation.**  **For PTACs**  **and PTHPs**  **with a**  **cooling capacity**  **greater than**  **15,000 Btu/h** 

**cooling capacity,**  **DOE determined**  **the EER**  **value using**  **a cooling**  **capacity of**  **15,000 Btu/h**  **in the** 

**energy­efficiency equation.**  **This is**  **the same**  **method established**  **in the**  **Energy Policy**  **Act of** 

**9­6 1992**  **and provided**  **in ASHRAE**  **Standard 90.1­1999**  **for calculating**  **the EER**  **and COP**  **of**

**equipment with**  **cooling capacities**  **smaller than**  **7,000 Btu/h**  **and larger**  **than 15,000**  **Btu/h.**

**Table 9.3.3**  **and Table**  **9.3.4 list**  **the equations**  **for the**  **corresponding TSL**  **for standard**  **size**

**PTAC and**  **PTHP.**

Table 9.3.3 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by TSL

for Standards Size PTACs

Standard Size** PTACs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 12.5**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 13.2**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL A**  **EER**

**= 13.8**  **­ (0.300 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 13.4**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 6**  **(Max Tech)**  **EER**

**= 13.6**  **­ (0.233 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **having an**  **external wall**  **opening of** 

**greater than**  **or equal**  **to 16**  **inches high**  **or greater**  **than or**  **equal to**  **42 inches**  **wide, and**  **having a**  **cross­sectional area** 

**greater than**  **or equal**  **to 670**  **inches squared.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

Table 9.3.4 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by TSL

for Standard Size PTHP

Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 13.0**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 13.2**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 13.2**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL A**  **EER**

**= 14.0**  **­ (0.300 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 13.4**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 13.4**  **­ (0.233 x**  **Cap †**  **/1000)**

**TSL 6**  **(Max Tech)**  **EER**

**= 13.6**  **­ (0.233 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **having an**  **external wall**  **opening of** 

**greater than**  **or equal**  **to 16**  **inches high**  **or greater**  **than or**  **equal to**  **42 inches**  **wide, and**  **having a**  **cross­sectional area** 

**greater than**  **or equal**  **to 670**  **inches squared.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**9­7**9.3.3 Rationale for Revised Slope of TSL A for Standard Size PTACs and PTHPs in the

Cooling Mode

**DOE further**  **considered the**  **effects of**  **R­410A on**  **system performance**  **for larger**  **cooling**

**capacities by**  **further investigating**  **the slope**  **of the**  **energy­efficiency equations**  **for standard**  **size**

**PTACs and**  **PTHPs. DOE**  **found that**  **as a**  **standard size**  **PTAC or**  **PTHP increases**  **in capacity,** 

**manufacturers typically**  **increase the**  **coil surface**  **area or**  **add a**  **coil row**  **to the**  **heat exchanger**  **in**

**order to**  **increase unit**  **capacity. Manufacturers**  **of standard**  **size PTACs**  **and PTHPs**  **maintain the** 

**same physical**  **box sleeve**  **(i.e., 42**  **inches by**  **16 inches)**  **across all**  **models regardless**  **of cooling** 

**capacity. This**  **sleeve size**  **is an**  **established common**  **sleeve size**  **that allows**  **standardization**

**across the**  **industry. This**  **common sleeve**  **size allows**  **end­users to**  **simply slide**  **replacement units** 

**into existing**  **wall sleeve**  **openings. However,**  **the standard**  **size wall**  **sleeve imposes**  **a limitation** 

**on the**  **total volume**  **available into**  **which all**  **components must**  **fit. Manufacturers**  **add heat** 

**exchanger coil**  **area or**  **coil volume**  **to either**  **increase the**  **cooling capacity**  **or to**  **obtain higher** 

**efficiencies. This**  **fixed volume**  **limits the**  **size of**  **the box**  **into which**  **the unit's**  **components must** 

**fit. In**  **turn, this**  **fixed volume**  **limits the**  **size of**  **heat exchangers**  **and other**  **components that**  **can**

**be used**  **to increase**  **efficiency and**  **there are**  **accompanying decreases**  **in thermodynamic**  **returns**

**when making**  **such changes.**  **Thus, higher**  **capacity units**  **often have**  **lower energy**  **efficiency**

**potentials due**  **to the**  **size constraints**  **of the**  **box sleeve.** 

**In order**  **to consider**  **the effects**  **of the**  **refrigerant phaseout**  **on larger**  **capacity units,**  **DOE**

**reviewed the**  **market data**  **for standard**  **size equipment**  **in the**  **AHRI Certified**  **Directory. DOE** 

**applied the**  **efficiency degradations**  **distinguished by**  **cooling capacity**  **ranges estimated**  **in the** 

**engineering analysis**  **to each**  **of the**  **models in**  **the AHRI**  **Certified Directory.**  **DOE used**  **these**

**data to**  **estimate the**  **overall system**  **performance of**  **the models**  **in the**  **AHRI Certified**  **Directory**

**utilizing R­410A**  **refrigerant. From**  **these data,**  **DOE plotted**  **each TSL**  **it considered**  **as part**  **of the** 

**final rule**  **to see**  **if there**  **were models**  **in the**  **full range**  **of cooling**  **capacity with**  **estimated**

**performance utilizing**  **R­410A refrigerant**  **that would**  **meet the**  **TSL being**  **considered.**

**Figure 9.3.1**  **and Figure**  **9.3.2 show**  **each energy­efficiency**  **equation plotted**  **for the** 

**various TSLs**  **for standard**  **size PTACs**  **and PTHPs,**  **in addition**  **to the**  **equipment listed**  **in the** 

**2008 AHRI**  **Directory that**  **utilize R­22**  **and estimated**  **equipment performance**  **with the**  **R­410A**

**system performance**  **degradations applied.** 

**9­8**EER Baseline (ASHRAE 90.1­1999)

TSL 1, TSL 2, TSL 4

TSL 3

TSL A

TSL 5

TSL 6 (Max Tech)

R­22 Performance Data (AHRI Directory)

R­410A Estimated Performance Data (Engineering Analysis)

6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000

Cooling Capacity (Btu/h) 12.5

11.5

10.5

9.5

8.5

7.5

Figure 9.3.1 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by

TSL for Standard Size PTACs and 2008 AHRI Directory Equipment

**9­9**9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5EER Baseline (ASHRAE 90.1­1999)

TSL 1

TSL 2, TSL 3

TSL A

TSL 4, TSL 5

TSL 6 (Max Tech)

R­22 Performance Data (AHRI Directory)

R­410A Estimated Performance Data (Engineering Analysis)

6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000

Cooling Capacity (Btu/h)

Figure 9.3.2 Energy­Efficiency Equations (EER as a Function of Cooling Capacity) by

TSL for Standard Size PTHPs and 2008 AHRI Directory Equipment

**For TSL**  **A, which**  **is the**  **amended standard**  **level for**  **standard size**  **PTACs and**  **PTHPs,**

**DOE adjusted**  **the slope**  **of the**  **energy­efficiency equation**  **from the**  **revised slopes**  **calculated for** 

**the NOPR.**  **This adjustment**  **was based**  **on manufacturer**  **comment and**  **DOE data**  **pointing to**  **the**

**reduced opportunities**  **for achieving**  **greater efficiencies**  **for larger**  **capacity PTAC**  **and PTHP** 

**equipment. By**  **revising the**  **slope in**  **this manner,**  **DOE could**  **create a**  **standard level**  **that is**  **more**

**stringent for**  **lower cooling**  **capacities, where**  **manufacturers have**  **additional physical**  **space to**  **add**

**efficiency improvements,**  **but is**  **less stringent**  **for higher**  **cooling capacities,**  **where manufacturers** 

**are physically**  **constrained by**  **the physical**  **dimensions of**  **the box**  **sleeve and**  **less able**  **to**

**introduce efficiency**  **improvements.**

9.3.4 Revised Energy­Efficiency Equations for Non­Standard Size PTACs and PTHPs in

the Cooling Mode

**For non­standard**  **size PTAC**  **and PTHP**  **equipment, DOE**  **used the**  **ASHRAE Standard** 

**90.1­1999 energy­efficiency**  **equation slope**  **and the**  **representative cooling**  **capacity (i.e.,**  **11,000**

**Btu/h cooling**  **capacity) to**  **develop the**  **energy­efficiency equations**  **representing the**  **entire**

**cooling capacity**  **range at**  **each TSL.**  **For PTACs**  **and PTHPs**  **with cooling**  **capacity less**  **than**

**9­10 7,000**  **Btu/h, DOE**  **determined the**  **corresponding EER**  **value by**  **substituting the**  **cooling capacity** 

**of 7,000**  **Btu/h in**  **the energy­efficiency**  **equation. For**  **PTACs and**  **PTHPs with**  **a cooling**  **capacity**

**greater than**  **15,000 Btu/h**  **cooling capacity,**  **DOE determined**  **the EER**  **value by**  **substituting the** 

**cooling capacity**  **of 15,000**  **Btu/h in**  **the energy­efficiency**  **equation. This**  **is the**  **same method** 

**established in**  **the Energy**  **Policy Act**  **of 1992**  **and provided**  **in ASHRAE**  **Standard 90.1­1999**  **for**

**calculating the**  **EER and**  **COP of**  **equipment with**  **cooling capacities**  **less than**  **7,000 Btu/h**  **and**

**greater than**  **15,000 Btu/h.** 

**Table 9.3.5**  **and Table**  **9.3.6 list**  **the equations**  **for the**  **corresponding TSL**  **for non­standard** 

**size PTAC**  **and PTHP.** 

Table 9.3.5 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTAC

Non­Standard Size** PTACs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 10.9**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 12.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with existing**  **wall sleeve**  **dimensions having**  **an external** 

**wall opening**  **of less**  **than 16**  **inches high**  **or less**  **than 42**  **inches wide,**  **and having**  **a cross­sectional**  **area less**  **than 670** 

**inches squared.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**9­11**Table 9.3.6 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTHP

Non­Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **EER**

**= 10.8**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 1**  **EER**

**= 11.7**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 2**  **EER**

**= 12.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 3**  **EER**

**= 12.0**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 4**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

**TSL 5**  **EER**

**= 12.3**  **­ (0.213 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **EER values**  **must be**  **rated at**  **95oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products**  **and evaporatively­cooled**  **products and**  **at 85oF**  **entering water**  **temperature for** 

**water cooled**  **products.**

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with existing**  **wall sleeve**  **dimensions having**  **an external** 

**wall opening**  **of less**  **than 16**  **inches high**  **or less**  **than 42**  **inches wide,**  **and having**  **a cross­sectional**  **area less**  **than 670** 

**inches squared.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**DOE further**  **considered the**  **effects of**  **R­410A on**  **system performance**  **for larger**  **cooling**

**capacities by**  **further investigating**  **the slope**  **of the**  **energy­efficiency equations**  **for non­standard** 

**size PTACs**  **and PTHPs.**  **DOE found**  **that as**  **a non­standard**  **size PTAC**  **or PTHP**  **increases in** 

**capacity, manufacturers**  **typically increase**  **the coil**  **surface area**  **or add**  **a coil**  **row to**  **the heat** 

**exchanger in**  **order to**  **increase unit**  **capacity. The**  **fixed volume**  **of the**  **box sleeve**  **imposes a** 

**physical limit**  **on the**  **size of**  **heat exchangers**  **and other**  **unit components**  **that can**  **be used**  **to**

**increase efficiency.**  **Thus, higher**  **capacity units**  **often have**  **lower energy**  **efficiency potential**  **due**

**to the**  **size constraints**  **of the**  **box.**

**In order**  **to consider**  **the effects**  **on larger**  **capacity units,**  **DOE reviewed**  **the market**  **data**

**for non­standard**  **size equipment**  **in manufacturer**  **equipment catalogs.**  **DOE applied**  **the**

**efficiency degradations**  **distinguished by**  **cooling capacity**  **ranges estimated**  **in the**  **engineering**

**analysis to**  **each of**  **the non­standard**  **models offered**  **for sale**  **and described**  **in manufacturer** 

**equipment catalogs.**  **DOE used**  **this data**  **to estimate**  **the overall**  **system performance**  **of the** 

**models on**  **the market**  **utilizing R­410A**  **refrigerant. DOE**  **was able**  **to plot**  **each of**  **the TSLs**  **it**

**considered as**  **part of**  **the final**  **rule (i.e.,**  **TSL 1**  **through 5)**  **to see**  **if there**  **were models**  **in the**  **full**

**range of**  **cooling capacities**  **with estimated**  **performance utilizing**  **R­410A refrigerant**  **that would** 

**meet the**  **TSL being**  **considered. These**  **plots demonstrated**  **the specific**  **cooling capacities**  **where**

**the TSL**  **or amended**  **standard would**  **be eliminating**  **all of**  **the models**  **from the**  **market using**  **the**

**estimated R­410A**  **performance.**

**Figure 9.3.3**  **and Figure**  **9.3.4 show**  **each equation**  **plotted for**  **the various**  **TSLs for**  **non**

**standard size**  **PTACs and**  **PTHPs, in**  **addition to**  **the equipment**  **listed in**  **manufacturers’ catalogs** 

**that utilize**  **R­22 and**  **the estimated**  **performance equipment**  **with the**  **R­410A system**  **performance**

**degradation applied.** 

**9­12**7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0EER Baseline (ASHRAE 90.1­1999)

TSL 1, TSL 2, TSL 4

TSL 3

TSL 5

R­22 Performance Data (AHRI Directory)

R­410A Estimated Performance Data (Engineering Analysis)

6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000

Cooling Capacity (Btu/h)

Figure 9.3.3 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTACs and 2008 AHRI Directory Equipment

**9­13**7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0EER Baseline (ASHRAE 90.1­1999)

TSL 1

TSL 2, TSL 3

TSL 4, TSL 5

R­22 Performance Data (AHRI Directory)

R­410A Estimated Performance Data (Engineering Analysis)

6,000 8,000 10,000 12,000 14,000 16,000 18,000 20,000

Cooling Capacity (Btu/h)

Figure 9.3.4 Energy­Efficiency Equations for Cooling Mode (EER as a Function of Cooling

Capacity) by TSL for Non­Standard Size PTHPs and 2008 AHRI Directory Equipment

9.3.5 Existing Federal Energy­Efficiency Equations for PTACs and PTHPs and the

Energy­Efficiency Equations in ASHRAE Standard 90.1­1999 in the Heating Mode

**The current**  **Federal energy**  **conservation standards**  **for PTHPs**  **in the**  **heating mode**  **is**

**expressed as**  **heating coefficient**  **of performance**  **(COP) as**  **a function**  **of the**  **PTHP’s cooling**  **EER.**

**Similar to**  **the energy­efficiency**  **equations for**  **PTHPs in**  **the cooling**  **mode, the**  **Federal energy** 

**conservation standards**  **specify COP**  **in the**  **form of**  **an energy­efficiency**  **equation as**  **a function**  **of**

**EER for**  **PTHPs with**  **a cooling**  **capacity greater**  **than or**  **equal to**  **7,000 Btu/h**  **and less**  **than or** 

**equal to**  **15,000 Btu/h.**  **For PTHPs**  **with cooling**  **capacity less**  **than 7,000**  **Btu/h, the**  **standard is** 

**specified by**  **the COP**  **value corresponding**  **to the**  **EER value**  **for equipment**  **with cooling**  **capacity**

**of 7,000**  **Btu/h in**  **the energy­efficiency**  **equation. For**  **PTHPs with**  **a cooling**  **capacity greater** 

**than 15,000**  **Btu/h, the**  **standard is**  **specified by**  **the COP**  **value corresponding**  **to the**  **EER value** 

**for equipment**  **with cooling**  **capacity of**  **15,000 Btu/h**  **in the**  **energy­efficiency equation.** 

**The current**  **Federal minimum**  **energy conservation**  **standards for**  **PTHPs in**  **the heating** 

**mode in**  **terms of**  **the COP**  **are presented**  **in Table**  **9.3.7.**

**9­14**Table 9.3.7 Existing Federal Energy Conservation Standards for PTHPs (Heating Mode)

Equipment Class Existing Federal

Energy Conservation Standards Equipment Cooling Capacity

**PTHP <7,000**  **Btu/h COP** 

**= 2.7** 

**>7,000 Btu/h**  **and**

**<15,000 Btu/h**  **COP**

**= 1.3**  **+ (0.16**  **x EER)** 

**>15,000 Btu/h**  **COP**

**= 2.5** 

**The efficiency**  **requirements in**  **ASHRAE Standard**  **90.1­1999 are**  **specified by**  **energy**

**efficiency equations**  **as a**  **function of**  **the equipment’s**  **cooling capacity**  **for PTHPs**  **with a**  **cooling**

**capacity greater**  **than or**  **equal to**  **7,000 Btu/h**  **and less**  **than or**  **equal to**  **15,000 Btu/h**  **for each** 

**equipment class**  **(i.e., COP**  **is a**  **function of**  **the equipment’s**  **cooling capacity).**  **For PTHPs**  **with**

**cooling capacity**  **less than**  **7,000 Btu/h,**  **the standard**  **is determined**  **by the**  **corresponding COP** 

**value by**  **substituting the**  **cooling capacity**  **of 7,000**  **Btu/h in**  **the energy­efficiency**  **equation. For** 

**PTHPs with**  **a cooling**  **capacity greater**  **than 15,000**  **Btu/h, the**  **standard is**  **determined by**  **the**

**corresponding COP**  **value by**  **substituting the**  **cooling capacity**  **of 15,000**  **Btu/h in**  **the energy** 

**efficiency equation.** 

**Table 9.3.8**  **shows the**  **ASHRAE Standard**  **90.1­1999 energy­efficiency**  **equations for**  **the**

**COP of**  **PTHPs.**

**9­15**Table 9.3.8 ASHRAE/IESNA Standard 90.1­1999 Energy­Efficiency Levels for PTHPs

(Heating Mode)

Equipment Class Proposed Energy

Conservation Standards Equipment Category Cooling

Capacity

**PTHP Standard**  **Size** ***** **<7,000 Btu/h**  **COP**

**= 3.0** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **COP**

**= 3.2** 

**– (0.026**  **x Cap**  **† )** 

**>15,000 Btu/h**  **COP**

**= 2.8** 

**Non­Standard Size** ** **<7,000 Btu/h**  **COP**

**= 2.7** 

**≥7,000 Btu/h**  **and**

**≤15,000 Btu/h**  **COP**

**= 2.9** 

**– (0.026**  **x Cap**  **† )** 

**>15,000 Btu/h**  **COP**

**= 2.5** 

***** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **greater than**  **or equal**  **to 16**  **inches**

**high, or**  **greater than**  **or equal**  **to 42**  **inches wide.** 

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **less than**  **16 inches**  **high and** 

**less than**  **42 inches**  **wide. ASHRAE/IESNA**  **Standard 90.1­1999**  **also includes**  **a factory**  **labeling requirement**  **for**

**non­standard size**  **PTAC and**  **PTHP equipment**  **as follows:**  **“MANUFACTURED FOR**  **REPLACEMENT**

**APPLICATIONS ONLY;**  **NOT TO**  **BE INSTALLED**  **IN NEW**  **CONSTRUCTION PROJECTS.”** 

**† Cap**  **means cooling**  **capacity in**  **kBtu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

9.3.6 Revised Energy­Efficiency Equations for Standard Size and Non­Standard Size

PTACs and PTHPs in the Heating Mode

**To maintain**  **consistency with**  **ASHRAE Standard**  **90.1­1999 and**  **to develop**  **the energy** 

**efficiency equations**  **for heating**  **COP, DOE**  **evaluated the**  **COP as**  **a function**  **of cooling**  **capacity.**

**DOE found**  **the COP**  **based on**  **the linear**  **regressions between**  **EER and**  **COP developed**  **as part**  **of**

**the engineering**  **analysis. Then,**  **DOE applied**  **the same**  **methodology for**  **deriving the**  **energy**

**efficiency equations**  **as that**  **for the**  **cooling mode.**  **To derive**  **the standard**  **size PTHP**  **energy**

**efficiency equations**  **(i.e., COP**  **as a**  **function of**  **cooling capacity),**  **DOE plotted**  **the representative** 

**cooling capacities**  **and corresponding**  **COP levels**  **for each**  **TSL. For**  **non­standard size**  **PTHPs,**

**DOE used**  **the ASHRAE**  **Standard 90.1­1999**  **equation slope**  **and the**  **representative cooling** 

**capacity (i.e.,**  **11,000 Btu/h)**  **to develop**  **the energy­efficiency**  **equations for**  **heating COP**  **that**

**correspond to**  **the entire**  **cooling capacity**  **range at**  **each TSL.** 

**Table 9.3.9**  **and Table**  **9.3.10 list**  **the energy­efficiency**  **equations for**  **COP and**  **the**

**corresponding TSL**  **for standard**  **and non­standard**  **size PTHP,**  **respectively.**

**9­16**Table 9.3.9 Energy­Efficiency Equations for Heating Mode (COP as a Function of Cooling

Capacity) by TSL for Standard Size PTHP

Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **COP**

**= 3.2**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 1**  **COP**

**= 3.4**  **­ (0.033 x**  **Cap †**  **/1000)**

**TSL 2**  **COP**

**= 3.5**  **­ (0.033 x**  **Cap †**  **/1000)**

**TSL 3**  **COP**

**= 3.5**  **­ (0.033 x**  **Cap †**  **/1000)**

**TSL A**  **COP**

**= 3.9**  **­ (0.067 x**  **Cap †**  **/1000)**

**TSL 4**  **COP**

**= 3.9**  **­ (0.067 x**  **Cap †**  **/1000)**

**TSL 5**  **COP**

**= 3.9**  **­ (0.067 x**  **Cap †**  **/1000)**

**TSL 6**  **(Max Tech)**  **COP**

**= 3.9**  **­ (0.067 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **COP values**  **must be**  **rated at**  **47oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products,**  **and at**  **70oF entering**  **water temperature**  **for water­source**  **heat pumps.** 

****** **Standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with wall**  **sleeve dimensions**  **having an**  **external wall**  **opening of** 

**greater than**  **or equal**  **to 16**  **inches high**  **or greater**  **than or**  **equal to**  **42 inches**  **wide, and**  **having a**  **cross­sectional area** 

**greater than**  **or equal**  **to 670**  **inches squared.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

Table 9.3.10 Energy­Efficiency Equations for Heating Mode (COP as a Function of

Cooling Capacity) by TSL for Non­Standard Size PTHP

Non­Standard Size** PTHPs Energy­Efficiency Equation*

**Baseline ASHRAE/IESNA**  **Standard 90.1­1999**  **COP**

**= 2.9**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 1**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 2**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 3**  **COP**

**= 3.1**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 4**  **COP**

**= 3.2**  **­ (0.026 x**  **Cap †**  **/1000)**

**TSL 5**  **COP**

**= 3.2**  **­ (0.026 x**  **Cap †**  **/1000)**

***** **For equipment**  **rated according**  **to the**  **DOE test**  **procedure, all**  **COP values**  **must be**  **rated at**  **47oF outdoor**  **dry­bulb**

**temperature for**  **air­cooled products,**  **and at**  **70oF entering**  **water temperature**  **for water­source**  **heat pumps.** 

****** **Non­standard size**  **refers to**  **PTAC or**  **PTHP equipment**  **with existing**  **wall sleeve**  **dimensions having**  **an external** 

**wall opening**  **of less**  **than 16**  **inches high**  **or less**  **than 42**  **inches wide,**  **and having**  **a cross­sectional**  **area less**  **than 670** 

**inches squared.** 

**† Cap**  **means cooling**  **capacity in**  **Btu/h at**  **95oF outdoor**  **dry­bulb temperature.** 

**9­17**