Thermolec ACU-STEAM Betriebsanleitung

User and Maintenance Manual

for the Homeowner

and

Installation Instructions

for the Contractor

ACU-STEAM™

Humidiﬁer

by Thermolec

Please read this manual carefully before beginning installation.

Important Notice to the Contractor :

Once the installation is complete, please leave this manual with the customer for future reference.

July 2010 V1.0

CONTRACTOR

Page 1

1. Warnings and Disclaimer – Installation Precautions

Please read and understand the warnings and instructions fully before you begin this installation and keep

them handy for future reference.

The manufacturer will assume no responsibility and the warranty will be void if the installer or the user does not

adhere to the following precautions :

1.1 This humidiﬁer will be connected to and used under water pressure and it must be installed in such a

way that if a leak occurs, the water could not cause any damage to the property. Make sure all water

connections are properly installed or a water leak could occur.

1.3 Do not install a humidiﬁer where the surrounding temperature may be 32ºF (0ºC) or colder. Freezing

water will damage the humidiﬁer and burst the supply pipe, resulting in home damage.

1.6 Do not install a humidiﬁer if the city water pressure exceeds 90 psi. Check the local codes related to

pressure reduction.

1.8 The installation, wiring and plumbing of the humidiﬁer must comply with national and local electrical,

plumbing and building codes.

1.9 Electrical wiring and water tubes must not come in contact with sharp edges or hot surfaces.

1.10 Make certain an appropriate drain system is installed and there is no resistance to the ﬂow of the

discharged water.

1.11 Do not set the humidity level higher than that recommended or condensation damage will occur.

1.13 Always shut the power off before you start the installation or when doing maintenance.An electric

shock from 120 or 240 volts could cause serious injury.

1.14 When you perform maintenance, please be careful because the unit can be extremely hot. Always

allow enough time for the unit to cool down.

1.15 To prevent electric shock or injuries, never operate the humidiﬁer without the cover as there are high

voltage and hot components inside.

1.16 This humidiﬁer will only work with non demineralized water. The maximum water supply temperature is

86 ºF (30 ºC)

HOME OWNERHOME OWNER

Page 2

Instructions and User Manual for the Homeowner

2. View of the unit

2.1 External view of the humidiﬁer. Fig. 2a

2.2 Water Tank Top View. Please see Fig. 2b.

2.3 Water tank Side View. Please see Fig. 2c.























Fig. 2c

Fig. 2b

HOME OWNERHOME OWNER

Page 3

3. Startup

3.1 The startup of the humidiﬁer is done in as follows :

Put the main power ON at the electrical panel. The green pilot light comes ON. The humidiﬁer is

ready to work.

Open the water supply valve.

Adjust the knob on the humidistat.

Working Principle :

3.2 Unlike other types of humidiﬁers which produce humidity by passing warm air on a water curtain, a

rotating pad or another type of media, this humidiﬁer produces humidity from steam dispersed directly into the

air.

3.3 A humidistat installed on the wall controls the unit. You set the knob of the humidistat according to your

need or comfort. Please read the next section about the humidity control.

3.4 When the humidistat senses a need for humidity, it starts the humidiﬁcation process.

3.5 The tank ﬁlls with water.

3.6 The electronic control starts the fan to move the air as the humidiﬁer starts boiling water and producing

steam. If the fan cannot start (i.e. there is no air movement to transport the steam or insufﬁcient air pressure),

the humidiﬁer stops itself. Please note that it may take a few minutes to bring the water to a boil. The steam

exits the water tank through the steam hose, moves to the steam diffuser installed in the fan module and is

spread into the room.

3.7 As water evaporates, the electric valve opens as needed to replenish the water in the tank.

3.8 When the humidity reaches the desired level, the humidiﬁer stops producing steam and automatically

drains. In order to eliminate the residues and keep the tank as clean as possible, the humidiﬁer also drains

after a certain number of boiling / reﬁll cycles. If there is still a demand from the humidistat after draining, the

tank reﬁlls and starts to produce steam again. This process is part of the self-cleaning feature.

3.9 When the humidistat is satisﬁed, the fan continues to run for a short period of time in order to eliminate

the steam from the ducts and the unit goes to ready mode, waiting for the next call from the humidistat.

HOME OWNERHOME OWNER

Page 4

4. How to Control the Humidity

4.1 Humidity level and comfort are personal matters but it is generally acknowledged that a Relative

Humidity of 35-40% is desirable. However, you should take the outside temperature into consideration

before setting the humidity level in order to avoid condensation on the windows. Usually, a narrow strip of

condensation around or at the bottom of the window is considered as normal.

4.2 If you installed an ACU-STEAM humidistat and an outdoor sensor, this adjustment will be done

automatically. The outdoor sensor reduces the setting of the humidistat according to the outdoor temperature

during cold days without having to set the humidistat knob manually.

It does the opposite during mild days. Please see Fig. 4b for the percentage of relative humidity on

the electronic humidistat label. The middle of the scale corresponds to the middle of the comfort zone,

approximately 35% RH (Relative Humidity).

4.3 If you are using a mechanical or other humidistat, the adjustment according to the outside temperature

will have to be done manually. For your information, the following table shows the recommended setting of the

humidistat according to the outside temperature. Please see Fig. 4a.

4.4 No matter which humidiﬁcation system you are using, please do not forget that the humidity level

cannot adjust quickly. It may take some time to build up the humidity to your comfort level. Depending on the

dryness of the house, carpets, furniture, drapes and wood will absorb moisture before you can feel the change.

4.5 If the house remains unoccupied during the winter season, set the humidistat to the minimum set point

in order to prevent condensation.

NOTE: The best location for the humidistat is at least two feet away from the faceplate and at a level that is

lower than the bottom of the faceplate.

Fig. 4b

Outside Temprature Recommended Setting

-22ºF (-30ºC) 15%

-13ºF (-25ºC) 20%

-4ºF (-20ºC) 25%

+5ºF (-15ºC) 30%

+14ºF (-10ºC) 35%

above

23ºF (-5ºC) 40%

Fig. 4a

HOME OWNERHOME OWNER

Page 5

5. Functions of the Electronic Circuit

5.1 The electronic board located inside the unit controls all the humidiﬁer functions. The front panel is

equipped with pilot lights indicating the status of the humidiﬁer. Please see Fig.5a.

Please refer to Article 5.2 for the description of the functions.

The red pilot light, which is a warning light, can either glow all the time or ﬂash when activated.

In case of error, the humidiﬁer enters stand-by mode. The ﬂashing of the pilot lights indicates which error

happened. The error recognition sequence is as follows :

The green pilot light near the power button blinks once;

The red light ﬂashes a certain number of times, this is the error code;

A pause with no light at all;

Another blink of the green light, once;

Another series of ﬂashing of the red light;

And so on until the condition is reset or service is performed.

Shutting the power OFF at the breaker in the main panel or depressing the power button until the

green light is fully on will reset the error code.

5.2 The ACU-STEAM humidistat also has two pilot lights to indicate the current status.

The green light is lit when the humidistat is demanding for humidity, thus activating the boiling cycle. The red

light indicates a warning and reproduces the same warning code as the red light on the humidiﬁer control

panel. If ever the red light is lit or ﬂashing on the humidistat, you know immediately that the humidiﬁer needs

attention.

Display Status Description

On/Standby

Green light OFF The humidiﬁer has no power – Breaker is OFF.

Blinking The humidiﬁer has power, but is in standby mode.

ON The humidiﬁer has power and is functional.

White button Press to put the humidiﬁer in stand-by mode.

The green light is blinking.

Press and keep depressed 3 seconds to power

or reset the humidiﬁer. The green light is ON.

Fan

White light ON The fan control is activated.

On/Standby - Green

Fan

Warning

Steam

Fill

Drain

- White

- Red

- White

- Blue

- Yellow

Fig. 5a

Mode

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Page 6

Warning

Red light ON An abnormal condition occurred.

Please refer to the error code table in Section 7.

Steam

White light ON The humidiﬁer is heating water to produce steam.

Filling cycle

Blue light ON The electric water valve is open thus ﬁlling the

humidiﬁer.

Draining cycle

Yellow light ON The humidiﬁer is in draining mode.

White button Not active on residential models.

HOME OWNERHOME OWNER

Page 7

6. What To Do if a Malfunction Occurs

6.1 Shut the main power OFF and restart the humidiﬁer to see if the error code disappears.

6.2 If you see a water leak, follow the water supply tube and close the valve installed on the water pipe

located near the humidiﬁer.

6.3 Please refer to the error code table to identify the possible cause of the malfunction and the actions that

you can take.

6.4 Should the problem persist, please call your service company. They are the best qualiﬁed to help you

quickly. Describe the problem to them and mention the error code you observed on the front panel. They may

help you solve the problem over the phone. If needed, they will ﬁx the problem themselves or call our technical

service.

6.5 Should you attempt to look at the unit yourself, please apply all appropriate safety measures. - Shut the

main power OFF and wait for the unit to cool before you open it.

7. Description of Error Codes

Number of

ﬂashes of the

red light Error Description Humidiﬁer Status Actions to be Taken

by the Owner Reset

OFF No error The humidiﬁer is working ﬁne None

Continuous

ON There is water in the

pan under the tank. Risk of overﬂow. Humidiﬁer stops

itself.

Turn the main power OFF, then

- Open the unit and check for leaks

- Check the drain tube

- Close the supply valve and call for

service

Automatic Reset when

switching main power ON

again.

1Problem with the water

level sensors inside the

unit.

Internal problem - Humidiﬁer cannot

read the water level properly and

stops itself.

Turn the main power OFF, then call

your service company

Automatic Reset when

switching main power ON

again.

3Inadequate water

supply.

Humidiﬁer cannot ﬁll properly and

stops itself - Heating elements and

supply valve are switched off.

Turn the main power OFF, then

- Check the water supply circuit

- Check if the water supply valve is

open.

- Call your service company

Automatic Reset when

switching main power ON

again.

4Inadequate drainage. Humidiﬁer cannot drain properly -

Risk of overﬂow - the unit stops itself.

Turn the main power OFF, then

- Close the supply valve

- Call your service company

Automatic Reset when

switching main power ON

again.

5Fan not running. Humidiﬁer stops itself. Turn the main power OFF, then

- Call your service company Automatic Reset when

error conditions disappear.

Temperature inside the

tank exceeded the high

temperature limit and

the safety switch has

tripped.

This is a very serious condition.

The humidiﬁer stops itself and cannot

restart without service.

Turn the main power OFF, then

- Call your service company

Only the service company

can reset the unit after

checking all functions.

HOME OWNERHOME OWNER

Page 8

8. Cleaning the tank

As with any device evaporating water, some minerals normally dissolved in the water may create deposits

inside of the unit. Even though the unit is draining and cleaning itself during normal operation , it will require a

bit of maintenance from time to time.

WARNING :

The water tank and its contents can become extremely hot. Please be careful when you handle it.

The tank may have water inside.

8.1 Since the tank is drained when the demand of the humidistat has been satisﬁed, there should be

approximately one inch of water if the unit is not operating. But if the humidistat is calling for steam and the

water is boiling, turn down the humidistat. The humidiﬁer will stop and drain. Please note that when using an

ACU-STEAM electronic humidistat, if the relative humidity is extremely low the humidiﬁer may still run with the

knob at the minimum setting because of a range limiter inside the cover. If this occurs you will need to remove

the humidistat cover by pulling it off and turn the knob completely counter-clockwise. The humidiﬁer should

now stop and drain. Wait until the unit has cooled before proceeding with the following steps.

8.2 Before doing anything, TURN THE MAIN POWER OFF.

8.3 Remove the cover by turning the two 1/4 turn screws to the left.

8.4 Unplug the white quick connect wire connected on the water pan at the bottom of the unit. This wire is

connected to the overﬂow sensor. Please see Fig. 8a.

White Wire

Main drain Tube

Overflow Pan

1. Lift 2. Pull

Overflow

Drain Tube

Rigid Drain Pipe

Overflow Sensor

Fig. 8a

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