R
24VAC Power Supply
Rc
24VAC Power Supply for Y1, Y2
C
24VAC Power Supply Common
Y1
Cool Stage 1, relay output
Y2
Cool Stage 2, relay output
W1
Heat Stage 1, relay output
W2
Heat Stage 2, relay output
G
Fan Control, relay output
8 • Emerson Programmable Touchscreen Thermostat I&O Manual
026-1739 Rev 0
For systems with only one stage, second stage terminals (Y2,W2) can be left
floating (open).
2.4.6. Wiring Guide - Heat Pump Systems (24VAC)
Shorting
Jumper
R
24VAC Power Supply
Rc
24VAC Power Supply for Y1, Y2
C
24VAC Power Supply Common
Y1
*Cool Stage 1, relay output
Y2
*Cool Stage 2, relay output
O/B
Reversing Valve, relay output
G
Fan Control, relay output
For systems with only one stage, second stage terminal (Y2) can be left floating
(open).
2H / 2C System with 2 Transformers
Table 2-6
- Dual Transformer System
2H / 2C System
Table 2-7
- Heat Pump Systems
*
NOTE: Stage 1 and Stage 2 for Heat Pumps are Compressor Stages (Heat/Cool) and not
only Cool Stages.
