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DH90 Dehumidifier • For HVAC Installer Only
2
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.