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Honeywell DH90 Installation Manual

Whole house dehumidifier with fresh air ventilation
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Fresh Air Ventilation
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.
HVAC Installer: Please leave manual for homeowner.
® U.S. Registered Trademark.
Copyright © 2006 Honeywell International Inc.
All rights reserved.
Dehumidification
Compact Size
Energy Efficient
DH90 Whole House Dehumidifier
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.
with fresh air ventilation
Installation Guide
69-1951

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Table of Contents
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  Summary of Contents for Honeywell DH90

  • Page 1: Introduction

    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.
  • Page 2: Table Of Contents

    DH90 Dehumidifier • For HVAC Installer Only Table of Contents Introduction ..... . . 1 Features & Benefits ....1 Safety Precautions .
  • Page 3: Intended Application

    With the optional ventilation ducting and ventilation control hookup, the device also provides precise amounts of ventilation air. 2. Approvals The DH90 is certified by ETL to meet UL 474 and CSA 22.2 No. 92. 3. Specifications Model: DH90 Electrical: 110-120 VAC, 6.2 Amps,...
  • Page 4: Condensate Removal

    Air may be drawn from a basement that is open to the home. All flexible ducting connected to the DH90 should be UL listed. A short piece of flexible ducting on all DH90 duct connections is recommended to reduce noise and vibration transmitted to rigid ductwork in the structure.
  • Page 5: B Ducting For Fresh Air-Option

    4.4C Installation in a Basement or Crawl Space with an Existing Forced Air HVAC System Install a separate 10" return for the DH90 in a central area of the structure. Optional: Duct the supply of the DH90 to a 10" x 10" x 10" tee/damper, adjusted to 20% open to the basement.
  • Page 6: D Installation In An Attic With An Existing Forced Air Hvac System

    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.
  • Page 7: Noise Abatement

    4.5 Noise Abatement A length of 10' or more of acoustical flex ducting on the outlet of the DH90 will reduce air noise from the fan. A length of flexible ducting on all DH90 duct connections is recommended to reduce noise transmitted to rigid ductwork in the structure.
  • Page 8: Choose Correct Wiring Diagram

    DH90 Dehumidifier • For HVAC Installer Only 6.1 Choose the correct wiring diagram based on HVAC system HVAC System Heat Room Wake Auto Figure 7: Single transformer, conventional system. Figure 8: Dual transformer, conventional system. HVAC HEATING COOLING System Heat...
  • Page 9: Parts List

    Vaulted ceilings do not need to be considered when setting this control. M19998A • For homes with multiple systems: Honeywell recommends a ventilation control and fresh air intake for each system. Measure ventilation airflow for each system independently. Refer to Multi-system Setup Example for further details.
  • Page 10: Service

    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.
  • Page 11: Refrigerant Charging

    Fan does not run with ventilation activated. Compressor runs briefly but cycles on & off with humidity control turned to ON. 1. Loose connection in fan circuit. 2. Obstruction prevents fan rotation. 3. Defective fan. 4. Defective fan relay. 5. Defective fan capacitor. Evaporator coil frosted continuously, low de- humidifying capacity.
  • Page 12 This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.

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