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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
Fresh Air Ventilation (optional)
install enclosure.
An automatic ventilation controller and dehumidi- Fresh air may be ducted to the unit and regulated
stat are included. using the provided Honeywell W8150 f
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DH90 Dehumidifier • For HVAC Installer Only Table of Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . 1 4.5 Noise Abatement . . . . . . . . . . . . . . . . 7 Features & Benefits . . . . . . . . . . . . . . . . . 1 5. Maintenance . . . . . . . . . . . . . . . . . . . . . . . 7 5.1 Air Filter . . . . . . . . . . . . . . . . . . . . . . . 7 Safety Precautions . . . . . . . . . . . . . . . . . . 2 5.2 Optional Fresh Air Intake . . . . . . . . . . 7 1. Intended Application
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For HVAC Installer Only • Installation Guide 4.1A Power Accessibility 1. Intended Application for DH90 Unit should be located in an area where the cord’s The DH90 is intended for use in residential length (10') should easily reach a 115 VAC electrical applications to reduce the indoor humidity levels outlet with a minimum of a 15 A circuit capacity. and increase comfort. With the optional ventilation ducting and ventilation control hookup, the device also provides precise amounts of ventil
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DH90 Dehumidifier • For HVAC Installer Only The DH90 plugs into a common grounded 115VAC 4.4 Ducting outlet. The device draws 6.2 Amps under normal operating conditions. If used in an area which ImPORTANT: When connecting ventilation may become wet, a ground fault interrupter (GFI) duct, remove the label and 6" round protected circuit is recommended. insulation plug from the ventilation duct opening. If not using ventilation feature, ImPORTANT: Do not install the humidistat leave the ins
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For HVAC Installer Only • Installation Guide equivalent rectangular. For longer lengths, structure. This helps prevent dirty and use a minimum 12" diameter or equivalent. humid air from entering elsewhere. Grills or diffusers on the duct ends must Exhaust fans are recommended in the not excessively restrict airflow. bathrooms and kitchen. • Isolated Areas: Effective dehumidification An insulated 6" diameter duct is generally may require that ducting be branched to sufficient to provide u
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DH90 Dehumidifier • For HVAC Installer Only W8150 EARD6 Controller Motorized Heating & A/C unit damper Fresh air intake Supply air Indoor air return Indoor air supply Indoor air return Figure 3: Attic Installation. Instead of installing a separate return to the DH90, The preferred method of installation is to create a Attic installation and if the existing system has multiple returns, separate return for the DH90 in a central area of it is possible to select one to disconnect from the struc
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OUTDOOR HUMIDITY -T 2E 0M FPERATUR -3 E 0 C SE1 T5 T% ING -10 F -25 C 20% +10 0 F F --1 20 0 C C 3 20 5% % Humidity Control +20 F -5 C 35% Régulateur d'humidité Over 20 F Over 0 C 40% Outdoor Humidity -2T 0e m f perature -30 c S1 e5 tt% ing -10 0 ff --2 20 5 c c 25 20% % Humidity control +10 f -10 c 30% over+ 2 20 0 ff over -0 5 c c 4 30 5% % Régulateur d'humidité For HVAC Installer Only • Installation Guide W8150 6. Wiring Diagrams Controller EARD6 Motorized DH90 damper Exhaust White Air
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DH90 Dehumidifier • For HVAC Installer Only 6.1 Choose the correct wiring diagram based on HVAC system HVAC HVAC R C W Y G R C W1 W2 Y1 Y2 G W8150A W8150A GF GF RC RC CC CC CH CH W W GT GT R RC W Y G R RC C W1 W2 Y1 Y2 G System System Heat Heat AM AM Fan Fan Tue Room Tue Room Wake DST Auto Wake DST Auto M19994 M19996 Figure 7: Single transformer, conventional system. Figure 9: Multi-stage conventional system. Figure 8: Dual transformer, conventional system. Figure 10: Wiring heat pump without em
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1 For HVAC Installer Only • Installation Guide HVAC TIPS: • Ventilation control reads new dial setting only when test button is pushed or power is cycled. R C Y W2 E G O To ensure dial settings are read, push test button after any changes are made. W8150A • For single bedroom homes, set the bedrooms GF dial to 2 (this may result in more ventilation than RC the minimum required). CC • For homes having more than five bedrooms CH and only a single ventilation system, set the W bedrooms dial t
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DH90 Dehumidifier • For HVAC Installer Only 9. Service CAUTION: Servicing the DH90 with its high pressure refrigerant system and high voltage circuitry presents a health hazard which could result in death, serious bodily injury, and/or property damage. Service should only be performed by a qualified service technician. 9.1 Troubleshooting 4. Defective compressor. 5. Defrost thermostat open. No dehumidification, neither fan nor compressor run with fan switch and ventilation timer OFF. 6. Optio
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For HVAC Installer Only • Installation Guide Fan does not run with ventilation activated. Unit Test to determine problem: Compressor runs briefly but cycles on & off 1. Detach field control wiring connections with humidity control turned to ON. from main unit. 1. Loose connection in fan circuit. 2. Connect the yellow and green pigtails 2. Obstruction prevents fan rotation. from the main unit together; only the impeller fan should run. Disconnect the 3. Defective fan. wires. 4. Defective fan
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DH90 Dehumidifier • For HVAC Installer Only Warranty Information Honeywell warrants this product, excluding battery, to be free from defects in the THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS workmanship or materials, under normal use and service, for a period of five (5) PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WAR- years from the date of purchase by the consumer. If at any time during the war- RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
