Heat Controller HDG48 Manuel D’Utilisation

Heat Controller, Inc. 

INSTALLATION INSTRUCTIONS 

HDG Series Air Handler

18

Keep the coil connections sealed until refrigerant connections are made. See the Installation Instructions 

for the outdoor unit for details on line sizing, tubing installation, and charging information.
Coil is shipped with “No charge”. Evacuate the system before charging with refrigerant.
Install refrigerant tubing so that it does not block service access to the front of the unit.
Nitrogen should flow through the refrigerant lines while brazing. 
Use a brazing shield to protect the cabinet’s paint and a wet rag to protect the rubber grommet from be-

ing damaged by torch flames. After the refrigerant connections are made, seal the gap around the con-

nections with pressure sensitive gasket.

Consult local codes for specific requirements.

1. 

When making drain fitting connections to the drain pan, use a thin layer of Teflon paste, silicone 

or Teflon tape and install, hand tighten.

2. 

When making drain fitting connections to drain pan, do not overtighten. Over tightening fittings 

can split pipe connetions on the drain pan.

•    Install drain lines so they do not block service access to front of the unit. Minimum clearance of 24 

inches is required for filter, coil or blower removal and service access. 

•    Make sure unit is level or pitched slightly toward primary drain connection so that water will drain 

completely from the pan. (See Fig. 5) 

•   Do not reduce drain line size less than connection size provided on condensate drain pan. 
•    All drain lines must be pitched downward away from the unit a minimum of 1/8” per foot of line to 

ensure proper drainage. 

•    Do not connect condensate drain line to a closed or open sewer pipe. Run condensate to an open 

drain or run line to a safe outdoor area. 

 

CONDENSATE DRAIN TRAP

DO NOT OVERTIGHTEN DRAIN FITTING

TOWARD DRAIN CONNECTION 

UNIT MUST BE SLIGHTLY INCLINED 

Fig. 5 CONDENSATE DRAIN TRAP

 

3"

3"

UNIT

TO APPROVED DRAIN

DO NOT OPERATE UNIT WITHOUT 

CONDENSATE DRAIN TRAP.