Electric Dehumidifier

ROSAHL
Instruction Manual

Molded Type
RDH-3P1 / RDHC-5P1 / RDHC-7P1NOTICE
1. Please read this manual before you use ROSAHL and use it correctly.
2. Please keep this manual to the person who operates, manages and maintains ROSAHL.

RYOSAI TECHNICA CO., LTD.
8-1-1 Tsukaguchi-Honmachi
Amagasaki-City, Hyogo, 661-0001 Japan
Phone : +81-6-6497-9078 Fax : +81-6-6497-9082

For Proper Usage
Use ROSAHL with 100V AC (RDH-3P1 can be used with 100/200V AC)
In order to avoid fire, electrical leakage and damage for ROSAHL.

Prohibited

DO NOT expose the moisture discharging side of a membrane directly to the winds and rain.
When using outdoors, Please attach a rainproof cover (option parts) or a cover to protect
a membrane from water.

Prohibited

Keep the moisture discharging side of membrane well ventilated.
Prohibited

DO NOT put pin or wire etc into the membrane. It may cause an electric shock andthe membrane may be damaged or deteriorate.

Prohibited

DO NOT use a silicon-based sealing materials to improve airtightness of a container.
Silicon-based sealing materials generate oxime gas and siloxane gas.
As a result, the performance of ROSAHL reduce in a short term.

Prohibited

DO NOT use ROSAHL with vapor phase corrosion inhibitor or insect repellent.
Do not use ROSAHL in a place having high density of organic gas. The performance ofROSAHL reduce in a short term.

Prohibited

DO NOT attempt to disassemble, repair or modify ROSAHL. It may cause an electric shockand the performance deterioration, as this may damage it.

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RB-OP21008-A

Installation
Make a moisture discharging hole and installation hole for the following dimensions on the container
and attach ROSAHL with screws.
Note 1) Processed dimensions for Moisture discharging hole and Installation hole, refer to Table 1.
Note 2) Processed dimensions for Rainproof cover, refer to Table 2.

Table 1. Installation dimensions (mm)Model name
RDH-3P1
RDHC-5P1
RDHC-7P1Dim. a57
120Dim. b73
106Dim. c56Dim. d3575Dim. e3575

Table 2. Rainproof cover installation dimensions (mm)*Option parts
Model name
RDH-3P1
RDHC-5P1
RDHC-7P1Dim. f
85
175Dim. g
57.5
67.5
Dim. h
57.5
82.5
Rainproof coverForFor
Model name
RDH-3J1
RDH-7J1

Fig.1

Precautions for Use of ROSAHL
1) Confirm the dehumidifying / humidifying surface of a membrane not to get a wrong direction before
installation. Attaching ROSAHL by mistake will adversely affect several things in the container.
2) Attach ROSAHL in the center of the inner side surface of a container with a gasket.
(Do not attach it on a top or bottom surface.)
3) A container must be an airtightness container. If a container has low airtightness and moisturepermeable material, the results may not be what you expected.
4)The water vapor go through a membrane of ROSAHL. If you switch off a power supply, outside
water vapor is returned into a container and the humidity is restored.
5) If you use ROSAHL with a gasket that contains an antioxidant, crystal materials may be generated on
the surface of a membrane. When you choose a gasket, evaluate it enough.
6) Do not use silicon-based sealing materials to improve airtightness of a container.
(Silicon-based sealing materials generate oxime gas and siloxane gas.
As a result, the performance of ROSAHL reduce in a short term.)
Additionally, when using any other sealing materials, ROSAHL must be attached after sealing materials
are completely cured. Volatile substances generated during curing affect the performance of ROSAHL.
[Recommended products] : modified silicon caulk (Konishi Co., Ltd.)
7) Do not expose a moisture discharging side of a membrane to water. When using outdoors, be sureto attach a rainproof cover (option parts) or a cover to protect a membrane from water or insects.
8) Attach a moisture-permeable sheet to a membrane to protect ROSAHL from much dust or oil mists.
[Recommended products] : Vent Filter TEMISH S-NTF2131A-S06 (Nitto Denko Corporation)9) Keep the moisture discharging side of a membrane well ventilated.
10) Do not use ROSAHL with vapor phase corrosion inhibitor or insect repellent.
Do not use ROSAHL in a place having high density of organic gas.
11) Do not do remodeling. ROSAHL may break down.

2 / 6RB-OP21008-AUsage

1. For RDH-3P1
1
2

Please turn on the AC power supply and get energized. (Please use 100/200V AC)
Please confirm lighting of the LED.* (It is a usage state)*Note : It might take 3-5 minutes to light the LED on the initial stage of turning on the power supply.
This is not abnormal.

●Please confirm the following matters when LED doesn't light.
(1) Is the power supply correctly connected?
(2) Is the input voltage correct?
(3) Does not the moisture discharging side of a dehumidifying element get wet?
(In this case, the overcurrent protection circuit of the power supply functions and LED
does not light. If the wet state is canceled, it returns to normal state.)

2. For RDHC-5P1·7P1
1
2
3

Please set the knob of humidity controller as the right side of it as possible.
(Low humidity side)
Please turn on the AC power supply and get energized. (Please use 100V AC)
Please confirm lighting of the LED.* (It is a usage state)*Note : It might take 3-5 minutes to light the LED on the initial stage of turning on the power supply.
This is not abnormal.

●Please confirm the following matters when LED doesn't light.
(1) Is the power supply correctly connected?
(2) Is the power supply AC100V?
(3) Does not the moisture discharging side of a dehumidifying element get wet?
(In this case, the overcurrent protection circuit of the power supply functions and LED
does not light. If the wet state is canceled, it returns to normal state.)

4

Please set the knob of humidity controller at the value you want.

●Precautions for Humidity Controller(1) The humidity controller only turns on / off the dehumidification function, and does not have thefunction that keeps inside of a container at the specified humidity.
(2) There may be a gap about ±10% from the set value. Also, the conditions of use and depending
on changes in the surrounding environment, the gap may become even larger. So pleaseconsider the set value as a guide only. We do not guarantee the accuracy.
(3) Please turn the knob of humidity controller slowly.

3 / 6RB-OP21008-A

Specifications
Model NameItems
Dehumidifying Performance
Applicable Volume(g/day)*1(m3)*2

Rated Voltage(V)RDH-3P1

RDHC-5P1

RDHC-7P1

2.9816~ 0.35
100/200 AC(85~264)3
169×72×33.5
0.25~1~2100 AC (85~132)

48Power Consumption(W)*3231×151×66.5
Dimensions(mm)*420 ~ 80
Humidity Set Range(%RH)*50.65
0.85
Weight(kg)-10 ~ 50
Operating Temperature(deg C)
Notes*1 The initial value at the temperature of 30 deg C and humidity 60%RH.
(The dehumidifying performance will reduce during use. How much it degrades depends on theoperating environment and conditions. If any signs of abnormality are seen, early replacement isrecommended.)*2 The applicable volume is for a sealed, moisture-impermeable container, and may vary dependingon the material of the container, state of sealing and required humidity.
*3 The annual average power consumption in average condition in Japan.
*4 Dimensions show the values of H × W × D in the figure below.
*5 RDH-3P1 is not equipped with humidity controller.

Outline (*Upper row : RDH-3P1, Lower row : RDHC-5P1·7P1)[Dehumidifying side][Moisture discharging side]
DName plateHW

Rear view(Mounting surface)

Front view
D[Dehumidifying side][Moisture discharging side]

NameplateHW

Rear view(Mounting surface)

Front view

4 / 6RB-OP21008-A

Prohibited Substances and Recommended Materials for ROSAHL
1. Prohibited substances
The substances which adversely affect ROSAHL and harm in response to ROSAHL are as follows.
The anode side is affected mainly. Even the additives of materials may be affected.
Please evaluate enough when a new substance is adopted or a maker is changed.
Classification

Inorganic
MatterOrganic
MatterSubstance Namehydrochloric acid gas

StateNotes

gas

nitric acid gas
other corrosion gases
SOx gasNOx gaschlorine gas
sulfurous acid gas
other pollution gases
concentrated hydrochloric acidconcentrated nitric acidsubstance which produces othercorrosion gas
divalent metal ion
siloxane gas
oxime gas
lamp black
diethylamine
other amine-based gas
amide-based low molecular weightcompoundmethylene chloride
perchloroethylene
trichloroethylene
perchloroethylene
tetrachloroethylene
other chlorinated solvent
oil mist
dimethyl sulfoxide
other sulfur based organic solvent
silicone sealantsilicone greasesilicone rubber
silicone-based sealing compoundother siloxane chemical compoundpran-ace
camphorother insect repellent
paradichlorobenzene
other chlorine-based insect repellent
vapor phase inhibitor
corrosion inhibitor which is added inmaterials
cigaret tar constituent

gas
gas
gas
gas
gas
gas
gas
liquidliquid

2,6-Di-tert-butyl-4-methylphenol (BHT)

liquidliquidliquid
gas
gas
gas
gas
gas
gas, liquid
liquidliquidliquidliquidliquidliquidliquidliquidliquid
solid
solid
solid
solid
solid
solid
solid
solid
gas, liquidgas, liquid
liquid, solid

These substances produce siloxane gas.
Heat treatment (bake) is necessary to remove
low molecule siloxane of non-reaction.

liquid, solidgas, liquid

5 / 6

The antioxidant which was added in packing

RB-OP21008-A

2. Recommended Materials
The recommended materials in a range understanding in us are as follows.
Classification

Material Name
Glass , Metal , Acrylic , Plastic

Frame
the material which does not include“Silicon group”
Sealing
Compound[Recommended products]
modified silicon caulk (Konishi Co., Ltd.)the material which does not include“Silicon group”

AdhesiveGasket

Notes
The acrylic and plastic resin has moisturepermeability. Please thicken the board
thickness when using them.
Do not use silicon-based sealing compounds.
In addition, about the recommendation product,
please operate ROSAHL after completelycured.
(Please avoid operating ROSAHL beforecuring.)
Do not use silicon-based adhesives.

[Recommended products]
Silex, SL220W, SL220LB(Konishi Co., Ltd.)
Silicon rubber(secondary vulcanization finished)
EPT rubber [Ethylene-propylene](single bubble)
PTFE rubber [Polytetrafluoroethylene]

About the silicon rubber, please performsecondary vulcanization by all means.
(ex. 200 deg C / 6 hours)
In addition, we don’t evaluate all silicon rubber,
EPT rubber, PTFE rubber.
Please evaluate enough when using them.

The above are just as of April 1, 2021 but not all of them. Please verify in advance and evaluate enoughwhen using our electric dehumidifier “ROSAHL”. We don’t take any responsibility or liability for any
damage or loss caused through the unknown phenomenon and the wrong usage.

Precautions in the Use for the Storage Cabinet
1. When you use ROSAHL to dehumidify into the storage cabinet, do not store volatile rust preventive orthings that organic gas volatilizes. The volatile gas which is released from goods reacted at a membrane's
anode and new harmful gas is produced.
As a result, not only it causes decrease in performance of ROSAHL, but also it might adversely affect on
goods in the storage cabinet. We cannot guarantee even if harm occurs to the stored valuables under theinfluence of new produced gas. Please evaluate enough when you use ROSAHL for the storage cabinet.
2. The maker who produces and sells storage cabinet equipped with ROSAHL should explain that enoughfor end users using the storage cabinet.

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