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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 – 3rd stage heat
Bosch Thermotechnology Corp. | 08.2016
UPM
OUT
ALR
CO M
Transformer
120 VAC
24 VAC
Cool/Compressor #1
Heat #1/Reversing Valve
Heat #2
Cool/Compressor #2
Heat #3
Bosch 3H/2C Touch-TechnologyThermostat | 7
A
T
RH
H
E
RC
R
M
C
O
S
Y1
T
A
W1
O/B
T
Fan
G
W2
Y2
AUX
Data subject to change
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