Wiring Diagram; Terminal Designator Descriptions - Bosch 8-733-944-325 Installation & Operation Manual

Installation, Operation & Application Manual

4 Wiring diagram

Figure 2
Factory installed jumper between RH and RC is required.
Thermostat is powered between RH & C.

4.1 Terminal designator descriptions

A – Alarm/display (24 VACinput, switched from RH)

 RC, RH – 24 VAC hot
C – 24 VAC common

 Y1 – 1st stage cool, 1st stage heat for heat pumps
Y2 – 2nd stage cool for 2-stage or 2-compressor systems. 2nd stage heat

for 2-stage or 2-compressor heat pump systems.
G – Fan

 W1/O/B – Configurable
— W1 – 1st stage heat for non-heat pump systems
— O – Cool active reversing valve
— B – Heat active reversing valve
W2 – 2nd stage heat for 1 compressor heat pump and non-heat pump

AUX – Humidifi er or dehumidifi er

Bosch Thermotechnology Corp. | 09.2016
UPM
OUT
ALR
CO M
Transformer
120 VAC 24 VAC
Cool/Compressor #1
Heat #1/Reversing Valve
Heat #2
Cool/Compressor #2
De(humidifier)
Bosch 2H/2C/Hum Touch-Technology Thermostat | 7
A
T
RH
H
E
RC
R
M
C
O
S
Y1
T
A
W1
O/B
T
G
Fan
W2
Y2
AUX
Data subject to change