Honeywell DH90A1007 Installation Guide - Page 4

DH90 Dehumidifier • For HVAC Installer Only 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. Figure 1: Ducting to isolated areas. 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 Fresh air intake W8150 Controller Supply air EARD6 Motorized damper Indoor air return  Ducting to isolated areas