Section 3. Installation - Trane Relay Panel Installation Manual

2.5 System Transformer Sizing Guidelines
OD Unit Type
Communicating Heat Pump
Communicating Air Conditioner
24Volt-Controlled Single Stage Heat Pump
24Volt-Controlled Single Stage Air Conditioner
24Volt-Controlled 2-Stage Single Compressor Heat Pump
24Volt-Controlled 2-Stage Single Compressor Air Conditioner
24Volt-Controlled 2-Stage Dual Compressor Heat Pump
24Volt-Controlled 2-Stage Dual Compressor Air Conditioner
*Note: The VA rating of all 24V field-installed accessories must be added to the above for sizing indoor unit control transformers or the accessories
must be powered separately.

Section 3. Installation

Unit Location Considerations
The unit's rugged design allows installation in closet, attic or other non-condensing locations free from obstruc-
tions or other hazards.
1
Remove Cover
Remove cover by grasping at edges and gently
pulling the cover straight towards you. It should
release without much effort.
2
Mark Mounting Location
Mark four holes on the wall using the base as a
template. A level may be used to ensure accuracy.
18-HD68D1-3
Indoor Unit Type
Comm Comm
Furnace Air Handler
Minimum Indoor 24V Control Power
Transformer Size, VA*
35 35
35 35
35 40
35 40
65 75
50 40
50 75
35 40
24V 24V
Furnace Air Handler
See Below
35 40
35 40
65 75
50 40
50 75
35 40
3