Heat Controller HDG Manual Do Utilizador

Heat Controller, Inc. 

INSTALLATION INSTRUCTIONS 

HDG Series Air Handler

12

IMPORTANT: Class 2 low voltage control wiring should not be run in conduit with main power 

wiring and must be separated from power wiring, unless class 1 wire of proper voltage rating is 

used. 

•  Low voltage control wiring should be 18 Awg. color-coded. For lengths longer than 100 ft., 

16 Awg. wire should be used.

•  Low voltage control connections are made to low voltage pigtails extending from top of air 

handler (upflow position - see Figure 3). Connections for control wiring are made with wire 

nuts. Control wiring knockouts (518 and 7/8) are also provided on the right and left side of 

the unit for side connection. 

•  See wiring diagrams attached to indoor and outdoor sections to be connected.
•  Make sure, after installation, separation of control wiring and power wiring has been 

maintained.

The unit must be permanently grounded. FaIlure to do so can result In electrical shock 

causing personal injury or death.   

•  This product must be sufficiently ground in accordance with National Electric Code (C.E.C. 

in Canada) and any applicable local ordinace.

•  Grounding may be accomplished by grounding metal conduit when installed in accord 

ance with electrical codes to the unit cabinet.

•  Grounding may also be accomplished by attaching ground wire(s) to ground lug(s) 

provided in the unit wiring compartment.

•  Ground lug(s) are located close to wire entrance on left side of unit (up-flow). Lug(s) may 

be moved to marked locations near wire entrance on right side of unit (upflow). If alternate 

location is more convenient. 

•  Use of multiple supply circuits require grounding of each circuit to lug(s) provided in unit.