Electronic Thermostat Installation - Bosch GreenSource SM024 Installation And Maintenance Manual

52 | Electronic Thermostat Installation

ELECTRONIC THERMOSTAT
INSTALLATION
Position the thermostat subbase against the wall
so that it is level and the thermostat wires
protrude through the middle of the subbase. Mark
the position of the subbase mounting holes and
drill holes with a 3/16-inch bit. Install supplied
anchors and secure base to the wall. Thermostat
wire must be 8-conductor, 18-AWG wire. Strip the
wires back 1/4-inch (longer strip lengths may
cause shorts) and insert the thermostat wires into
the connector as shown. Tighten the screws to
ensure secure connections. The thermostat has
the same type connectors, requiring the same
wiring. See instructions in the thermostat for
detailed installation and operation information.
R
24VAC (Hot)
C
24VAC (Common)
Y1
Compressor (1st Stage)
Y2
Compressor (2nd Stage)
w
Auxiliary Heat
O
Reversing Valve
G
Blower Relay
L
System Monitor
Figure # 109 Thermostat Wiring
When using a 2-cool, 3-heat thermostat W1 and
W2/EM must be connected together via a
jumper. (Figure#110)
THERMOSTAT
R
G
Y
C
O
B
E
W2
Figure # 110
6 720 220 406 (2013/1)
PACKAGED
HEAT PUMP
R
G
Y
C
O
B
W1
W2
Subject to change without prior notice
SM Series Heat Pump
SM Series Heat Pump