Bosch BCC100 - Installation Overview

Conventional Heating
(2 Stages) / Cooling System
(2 Stages) with humidifier
Install a jumper between R/h
and Rc only if a single
transformer is used for
heating and cooling.
Otherwise connect the
heating transformer to R/h
and/or the cooling
transformer to Rc.
-
G
W2
Y2
O/B
H/Dh
Data
C
W/E
Y
R/h
Rc
Thermostat
Conventional Heating /
Cooling system without
the C or spare wire (also
commonly called a 4-wire
system)
▶ At the unit, connect C
with the G wire
▶ Connect Y to G
-
G
W2
Y2
O/B
H/Dh
Data
C
W/E
Y
R/h
Rc
Thermostat
-
G
W2
Y2
O/B
H/Dh
Data
C
W/E
Y
R/h
Rc
Thermostat
Conventional Heating /
Cooling System
with C wire
The following are wiring diagrams for common systems: