Honeywell DH90 User Manual

Dehumidification

69-1951

Fresh Air Ventilation

Compact Size

Energy Efficient

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

DH90 Whole House Dehumidifier

with fresh air ventilation

Installation Guide

Fresh Air Ventilation (optional)

An automatic ventilation controller and dehumidistat 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 maintain 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.

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.

DH90 Dehumidifier • For HVAC Installer Only

Table of Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . 1

Features & Benefits . . . . . . . . . . . . . . . . . 1

Safety Precautions . . . . . . . . . . . . . . . . . . 2

1. Intended Application . . . . . . . . . . . . . . . . 3

2. Approvals . . . . . . . . . . . . . . . . . . . . . . . . . 3

3. Specifications . . . . . . . . . . . . . . . . . . . . . . 3

4. Installation . . . . . . . . . . . . . . . . . . . . . . . . 3

4.1 Installation Checklist . . . . . . . . . . . . . 3

4.1A Power Accessibility . . . . . . . . . . 3

4.1B Accessibility . . . . . . . . . . . . . . . 3

4.1C Support Structure and

Suspension . . . . . . . . . . . . . . . . 3

4.1D Sizing Chart . . . . . . . . . . . . . . . 3

4.2 Electrical Requirements . . . . . . . . . . . 3

4.3 Condensate Removal . . . . . . . . . . . . 4

4.4 Ducting. . . . . . . . . . . . . . . . . . . . . . . . 4

4.4A Fresh Air / Supply Air . . . . . . . . 4

4.4B Ducting for Fresh Air—Option . . 5

4.4C Installation in a Basement or Crawl Space with an Existing

Forced Air HVAC System . . . . . 5

4.4D Installation in an Attic with an Existing Forced Air

HVAC System . . . . . . . . . . . . . . 6

4.4E Installation in a Structure with Two Forced Air HVAC Systems . 6

4.5 Noise Abatement . . . . . . . . . . . . . . . . 7

5. Maintenance . . . . . . . . . . . . . . . . . . . . . . . 7

5.1 Air Filter . . . . . . . . . . . . . . . . . . . . . . . 7

5.2 Optional Fresh Air Intake . . . . . . . . . . 7

6. Wiring Diagrams . . . . . . . . . . . . . . . . . . . . 7

6.1 Choose correct wiring diagram . . . . . 8

7. 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 AND SAVE THESE INSTRUCTIONS

• The device is designed to be installed INDOORS IN A SPACE THAT IS PROTECTED FROM RAIN AND FLOODING.

• Install the unit with space to access the front panel for maintenance and service.

• Avoid directing the discharge air at people, or over the water in pool areas.

• If used near a pool or spa; be certain there is NO chance the unit could fall into the water, splashed and that it is plugged into a GFI GROUND FAULT INTERRUPT OUTLET.

• DO NOT place the device directly on structural members.

• A drain pan MUST be placed under the unit if installed above a living area or above an area where water leakage could cause damage.

For HVAC Installer Only • Installation Guide

1. Intended Application for DH90

The DH90 is intended for use in residential applications to reduce the indoor humidity levels and increase comfort. 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,

60 Hz, grounded

Capacity: 90 pints/day @ 80°F, 60%

Inlet air temperature range: 55°F min., 100°F max.

Air Flow: 200 CFM without external

ducting

4.1A Power Accessibility

Unit should be located in an area where the cord’s length (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 absorbers or unwanted noise may result.

The DH90 may be suspended from structural members by supporting the entire base of the unit via cross members, rigid frame, or the like. Do not hang the a DH90 from the cabinet. Remember to place a drain pan under the unit if it is suspended above a finished area or above an area where water leakage could cause damage.

Refrigerant Charge: 1 lb., 12 oz. R22

Duct Connections: Round 10" inlet, 10"

outlet, 6" ventilation inlet

Filter Size: Pleated MERV 11:

14" x 14" x 1"

Unit Size (w/o Duct Collars): 34.5"L x 15.75"W

x 20.875"H

Unit Weight: 92 lbs

Shipping Weight: 99 lbs

4. Installation

4.1 Installation Checklist

IMPORTANT: Prior to installation of the DH90, the following checklist should be reviewed.

The DH90 can be installed in a variety of locations to meet the owner’s needs, and integrate with existing forced air systems or existing ductwork if desired. Choose a location with consideration to accessibility for service, drain availability, and power outlet location.

4.1D Sizing Chart

*This sizing chart is based on extreme climates where Rh levels are between 70 and 90% outdoor Rh. For less extreme climates then larger homes can be adequetely served. Actual requirements

may vary.

Dehumidifier Capacity Required to

Maintain Desired Indoor Rh*

Home Size

(square

feet)

2080 49-54 55-58 71-78

2600 61-68 65-72 90-97

3120 75-82 79-86 95-110

60% Indoor Rh55% Indoor Rh50% Indoor

Pints/day Pints/day Pints/day

4.2 Electrical Requirements

WARNING: Installation must be performed by a qualified service technician and must comply with local codes. Remove power to the device before installing or servicing the device. Failure to connect the device according to these instructions may result in damage to the device or the controls.

DH90 Dehumidifier • For HVAC Installer Only

Fresh air intake

Supply air

Ducting to isolated areas

Indoor air

return

W8150 Controller

EARD6 Motorized damper

The DH90 plugs into a common grounded 115VAC outlet. The device draws 6.2 Amps under normal operating conditions. If used in an area which may become wet, a ground fault interrupter (GFI) protected circuit is recommended.

IMPORTANT: Do not install the humidistat where it may not accurately sense the relative humidity such as near HVAC supply registers, near exterior doors, on an outside wall, near a window, or near a water source.

Refer to Section 6 for typical hookup diagrams. Some of the control wires leaving the DH90 may not be used with certain installations and should be left unconnected with wire nuts taped onto the stripped ends for safety.

4.3 Condensate (Water) Removal

The DH90 removes a large amount of moisture from the air and the device must be connected to a drain line that will carry away the excess water. A trap in the drain line is recommended and may be required by some local codes.

The drain line should be connected to the 3/4" male pipe thread adaptor on the front of the DH90.

Care should be taken to install the drain line 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 bedrooms, den, utility room, or family room. See Fig. 1. Alternative installation option can be completed by drawing air directly from the return ducting and distributing through the supply air to the home.

4.4A Fresh Air / Supply Air

IMPORTANT: DO NOT draw air directly from the kitchen, laundry, or isolated basement.

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. Ducting the DH90 as mentioned requires consideration of the following points:

• Duct Sizing: For total duct lengths up to 25', use a minimum 10" diameter round or

Figure 1: Ducting to isolated areas.

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