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Installation and Operation Manual  -  

WHDEHUM-90P

6

pump configuration.  This will require expert 

installation.

4. 

Support the PVC tubing so that it maintains a 

smooth downward flow to drain.

5. 

Always test the drain before leaving the 

installation area.

Step 3: Electrical Power Connections

The dehumidifier is equipped with a 3-prong, 

standard 120VAC electrical plug.  Given operation 

in damp and wet environments, and to put safety 

first, the required electrical outlet to be used to 

connect the dehumidifiers should have:

1. 

Ground Fault Circuit Interrupter (GFCI)

2. 

15 Amp minimum circuit that cannot be shared 

with any other significant load

120VAC may cause serious injury from electric 

shock.  To ensure safety:

1. 

Disconnect electrical power before servicing.

2. 

Only plug unit into grounded electrical circuit.

3. 

Do not use extension cord.

4. 

Do not use a plug adapter.

Step 4: General Ducting Points and 

Requirements

In all cases, sound duct design practices must be 

followed, such as those provided in ACCA manual 

“D” of ASHRAE’s 

Fundamentals of Air System 

Design

.

For supply side air ducting (output from the 

dehumidifier), the WHDEHUM-90P has a 6” round 

duct.

For return side ducting, the dehumidifier is 

equipped as follows:

• 

A 12” round collar.

For ducting material to use between existing ducts 

or new ducts with the dehumidifier, it is advisable 

to select an acoustical flex duct material on all 

dehumidifier duct connections to reduce noise 

and vibration transmitted to rigid ductwork in the 

structure.  At the same time, flex ducting is very 

easy to use and eliminates the need for very 

detailed measurement, cutting, and duct forming.

Ducting for Standalone Unit Configuration

For Standalone Unit Dehumidification, there is not 

a connection to existing HVAC ductwork.  In the 

SUD case, when installing the dehumidifier inside a 

sealed crawlspace, a basement, or a sealed attic, 

the ducting requirements are  recommended as 

follows:

1. 

If the area is open without partitions and the 

dehumidifier can be located near the center 

of the zone, then the return ducting is not 

absolutely necessary.  Still, a minimum length 

of supply duct of just 3’ to 6’ will aid in overall 

air distribution.  The short supply duct distance 

will support carrying the dehumidified air far 

enough away from the unit that it will not be 

quickly reprocessed again as returned air.

2. 

If the area being served is divided by walls or 

partitions, then the return duct should be routed 

to a second area/zone than the area where the 

dehumidifier is placed - and the supply duct 

should be routed to even a third area.  These 

different areas will help push the air between 

the walls and/or partitions.

3. 

A similar but reverse strategy as #1 above, if 

the dehumidifier needs to be located along the 

perimeter in a more open zone, then a single 

return to the dehumidifier should be installed 

in the central open area of the structure to aid 

overall air distribution.

Ducting for Whole-House Separate Room

Figure 1 on page 4 depicts an example system 

configuration that is in a residential living 

environment but is not interconnected with an 

existing HVAC system.  The dehumidifier unit 

is separated given the living area is not in close 

proximity with the HVAC system, or the existing 

HVAC system could be a mini-split without any 

ductwork to connect with.  In either case, the 

dehumidifier is to be installed with its own separate 

ducting, including both return and supply side.  

Return Ducting for Whole-House Separate Room

The return duct length is not overly critical, and 

it is acceptable to provide more than a single 

WARNING

In all cases, local codes precede over 

installation and wiring recommendations.  Do 

not plug the dehumidifiers into the outlet until all 

the control circuitry is properly connected.

Summary of Contents for Comfort-Aire Century WHDEHUM-90P

Page 1: ...www marsdelivers com Installation and Operation Manual WHDEHUM 90P Whole House Dehumidifier...

Page 2: ...trary to these guidelines may void warranty The benefits of a properly humidified environment are many They include personal comfort as well as the preservation of furniture draperies carpets wooden f...

Page 3: ...t operating in standalone unit mode Condensate pump if not easy to reach gravity fed drain Air duct take offs and conversions as necessary if not operating in standalone mode ID plastic or vinyl drain...

Page 4: ...uire dehumidification As of late there is a growing trend towards mini split HVAC systems that are implemented as heating and cooling systems Separated dehumidification configurations are ideal soluti...

Page 5: ...wait a minimum of two hours before turning the unit on Additionally the Comfort Aire Century dehumidifier cannot sit directly on the floor unless the unit condensate drain output is feeding directly i...

Page 6: ...en installing the dehumidifier inside a sealed crawlspace a basement or a sealed attic the ducting requirements are recommended as follows 1 If the area is open without partitions and the dehumidifier...

Page 7: ...d or unconditioned area An example would be to feed the separate room from the main living area which would maximize the airflow from there proving a living area that likely is more dry than the other...

Page 8: ...OSESTO DISABLE DEHUMIDIFIER G If the dehumidifier is installed in an attic leak protection the unit should be place a normally closed condensate overflow s Wire the float switch to terminals A5 and R...

Page 9: ...reen The display screen has two functions When the unit is powered ON it shows the local humidity While setting the desired humidity level the screen will show the set point humidity level 2 Power Ind...

Page 10: ...iated float switch is open Step 2 Push the power switch to turn the dehumidifier ON Step 3 Press the Central Control button until the Whole House light turns on which indicates the unit is configured...

Page 11: ...delivers com within 60 days of purchase The original consumer must retain a receipted bill of sale as proof of warranty period part numbers serial numbers purchase and installation dates REMEDY PROVID...

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