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DH90 Whole House Dehumidifier

with fresh air ventilation

Installation Guide

Dehumidification

Fresh Air Ventilation

Compact Size

Energy Efficient

The  DH90  whole  house  dehumidifier  integrates 
high-capacity dehumidification, fresh air ventila-
tion,  and  filtration,  into  a  compact  and  easy  to 
install enclosure.

An automatic ventilation controller and dehumidi-
stat are included.

The dehumidifier removes 90 pints of water from 
the air per day (80F, 60% RH) while only using 6.2 
Amps of electricity.

The high moisture removal capacity helps main-
tain proper levels of humidity in most homes.

Dehumidification 

The  DH90's  high  efficiency  refrigeration  system  is 
further  enhanced  with  a  heat  exchanger  to  achieve 
exceptional  performance  while  keeping  your  energy 
costs as low as possible.

Fresh Air Ventilation (optional)

Fresh air may be ducted to the unit and regulated 
using  the  provided  Honeywell  W8150  fresh  air 
ventilation  controller  along  with  the  optional 
EARD6 damper.

69-1951

HVAC Installer: Please leave manual for homeowner.

® U.S. Registered Trademark. 
Copyright © 2006 Honeywell International Inc.
All rights reserved.

Summary of Contents for DH90A1007 - Whole House Dehumidifier

Page 1: ...e only using 6 2 Amps of electricity The high moisture removal capacity helps main tain proper levels of humidity in most homes Dehumidification The DH90 s high efficiency refrigeration system is further enhanced with a heat exchanger to achieve exceptional performance while keeping your energy costs as low as possible Fresh Air Ventilation optional Fresh air may be ducted to the unit and regulate...

Page 2: ... Parts List 9 8 Setting the Control 9 9 Service 10 9 1 Troubleshooting 10 9 2 Refrigerant Charging 11 9 3 Compressor Capacitor Replacement 11 Safety Precautions Read the installation operation and maintenance instructions carefully before installing and operating this device Proper adherence to these instructions is essential to obtain maximum benefit from your DH90 indoor air quality system READ ...

Page 3: ...10 should easily reach a 115 VAC electrical outlet with a minimum of a 15 A circuit capacity 4 1B Accessibility The installed DH90 should have at least 14 inches of clearance in the front of the device to service the filter 4 1C Support Structure and Suspension Place the DH90 on supports to raise the base of the unit Do not place the DH90 directly on structural building members without vibration a...

Page 4: ...ine with a continuous slope of 1 per 10 to assure proper water removal 4 4 Ducting Important When connecting ventilation duct remove the label and 6 round insulation plug from the ventilation duct opening If not using ventilation feature leave the insulation intact For the ideal installation draw air from the central part of the home and return it to the isolated areas of the home like the bedroom...

Page 5: ...haust fans are recommended in the bathrooms and kitchen An insulated 6 diameter duct is generally sufficient to provide up to 75 CFM of outside air Large quantities of outside air will impact DH90 performance positively or negatively depending upon the inside and outside air conditions The outside air duct should be connected to the 6 round collar on the side of the unit The amount of outside air ...

Page 6: ...of installation is to create a separate return for the DH90 in a central area of the structure Duct the supply of the DH90 to the air supply of the existing HVAC system Connect an insulated duct from outside to the 6 collar of the DH90 if you wish to provide fresh air Adjust a damper in the duct to provide the desired amount of fresh air See Figure 3 4 4E Installation in a Structure with No Existi...

Page 7: ...clean the screen on the outdoor fresh air intake port seasonally The screen may become plugged during the seasons when there are many particles in the outdoor air Exhaust Air Fresh air Inlet hood Indoor air return EARD6 Motorized damper W8150 Controller Figure 4 Install with no forced air HVAC system 6 Wiring Diagrams Dehumidistat DH90 24VAC for powered Humidistat Humidity Control Régulateur d hum...

Page 8: ...CH W GT NOTE REMOVE FACTORY INSTALLED JUMPER BETWEEN Cc AND CH ON W8150 W8150A Figure 8 Dual transformer conventional system 6 1 Choose the correct wiring diagram based on HVAC system Figure 9 Multi stage conventional system Wake Room System Fan Heat Auto AM DST Tue W1 C R W2 Y1 Y2 G W1 C RC R W2 Y1 Y2 G M19996 GF RC CC CH W GT HVAC W8150A Wake Room System Fan Heat Auto AM DST Tue R C Y G O RC R W...

Page 9: ... five bedrooms and only a single ventilation system set the bedrooms dial to 5 this may result in less ventilation than the minimum required For conditioned square feet set area sq ft dial to the nearest value For airflow set airflow cfm dial to the nearest value Vaulted ceilings do not need to be considered when setting this control For homes with multiple systems Honeywell recommends a ventilati...

Page 10: ...4 Defective compressor 5 Defrost thermostat open 6 Optional Condensate Pump Safety Switch open Fan runs when there is a call for dehumidifica tion and the ventilation control is OFF but the compressor cycles on and off too frequently 1 Low ambient temperature and or humidity causing unit to cycle through defrost mode 2 Defective compressor overload 3 Defective compressor 4 Defrost thermostat defec...

Page 11: ...er only the impeller fan should run Disconnect the wires 3 Connect the yellow and blue pigtails from the main unit together the compressor and impeller fan should run 4 If these tests work the main unit is working properly You should check the control panel and field control wiring for problems next 5 Remove the control panel from the mounting box and detach it from the field installed control wir...

Page 12: ...mages so this limitation may not apply to you THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT THE DURATION OF ANY IMPLIED WARRANTIES INCLUDING THE WAR RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS HEREBY LIMITED TO THE FIVE YEAR DURATION OF THIS WARRANTY Some states do not allow limitations on how long an implied warranty lasts so the above limita ti...

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