DCN: 141-01435-01 8/30/06
16
HVAC System Wiring
Diagram 2 - Heat Pump System Wiring
Heat Pump HVAC System Setup Notes:
Single Stage Compressor Systems use
Y1 for
stage 1
heating/cooling, and
W1 for
stage 2
heating (heat
strips).
Two Stage Compressor Systems use
Y1 for
stage 1
,
Y2 for
stage 2
heating/cooling, and
W1 for
stage 3
heating (heat strips).
NOTE: You must configure the Changeover valve setting to work correctly with your HVAC system.
Set Dipswitch SW1 as below for correct changeover operation. Changeover with cool is typical for
most systems. Check your system information to be sure. If you get cooling when you expect
heating, change SW1-S2 to the other position.
IMPORTANT!
Do not cut JP1 for Heat Pump Systems.
RC and RH are common for Heat Pumps.
Heat Pump HVAC System
G Fan
W1 Heat Strips (Heat Stage 3 )
Y1 Comp Stage 1
R 24VAC Return
C 24VAC Common
Red
Green
White
Yellow
24V RH
W1 Heat 1
G Fan
Y1 Comp 1
W2/O CO
HVAC SYSTEM
THERMOSTAT CONNECTION
TU16 Control Unit
Typical thermostat wiring color codes
Y2 Comp Stage 2
24V RC
J4
Y2 Comp 2
O Changeover Valve
Orange
Black
S2
Dipswitch SW1 Setup for Heat Pump HVAC Systems.
1. Set SW1-1 (position 1) to the Heat Pump position. (On - to the right)
2. Set SW1-2 (position 2) to the correct changeover (reversing valve) setting for your Heat Pump system.
a. For systems with changeover with cooling, Set SW1-2 to Off - to the left (default setting)
b. For systems with changeover with heating, Set SW1-2 to On - to the right
STD
SW1
1
2
OFF ON
HP
Wire R to either RH or RC
24C COM
HFRU REV P
JP1
RC&RH
FUSE
Blue
Note: Set SW1-S1 to HP
And S2 to correct Changeover valve
setting
