Heat Controller CDG SERIES Manuel D’Utilisation

Heat Controller, Inc. 

INSTALLATION INSTRUCTIONS 

Cased/Uncased Coils

8

Consult local codes for special requirements.

To provide extra protection from water damage, install an additional auxiliary drain pan, provided by 

installer under the entire unit with a separate drain line. Manufacturer will not be responsible for any 

damages due to the failure to follow these requirements.

Do not use the coil pan shipped with the unit on OIL furnaces or any application where the 

temperature of the drain pan may exceed 275°F. A field fabricated metal drain pan can be 

used for these type of applications. Fallure to follow this warning may result in property 

damage and/or personal injury.

If the uncased coil is to be installed on top of a gas furnace, allow enough space between the top of the 

furnace and the bottom of the plastic coil drain pan to have a free flow of air. A minimum of 2.0” distance 

from the top of the furnace and the bottom of the coil pan is required. The coil should be installed with 

the line set and drain openings to the front of the furnace.

The coil drain pan has a primary and an optional secondary drain with 3/4” NPT female connections; use 

either PVC or metal pipe and  hand tighten to a torque of approximately 37 in-lbs. to prevent damage to 

the drain pan connection. An insertion depth between 3/8'' to 1/2" inches (3-5 turns) should be expected 

at this torque setting.

Use male 3/4” NPT threaded fitting for outside connection and make sure the drain holes are not blocked. 

Insulation may be needed for drain line to prevent sweating.

W

or

2''

Bottom flange detail 

can be typical of the 

details below

GAS FURNACE

Fig. 4: Uncased Coil

W=Coil Pan Width + Insulation Thickness x2