Electronic Thermostat Installation - Bosch SM024 Installation, Operation And Maintenance Manual

56 | Electronic Thermostat
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.
When using a 2-cool, 3-heat thermostat both the
W1 & W2 on the Heat Pump and W2 & EM on
the thermostat must be connected together via
a jumper. (See Figure#115)
THERMOSTAT
R
G
Y1
Y2
C
O
B
E
W2
Figure # 115
6 720 220 406 (2015/02)
PACKAGED
HEAT PUMP
R
G
Y1
Y2
C
O
B
W1
W2
Subject to change without prior notice
SM Series Heat Pump
Packaged heat pumps are equipped with
detachable Thermostat connectors. These
connectors are located in different locations
based on the blower motor that is installed in the
unit.
a) For the X13 motor, the two detachable
connectors are on the Main Harness;
connectors are marked as P1 and P2. See Wire
Harness Drawing on Pg#72.
b) For the EON motor, the three detachable
thermostat connectors are located on the ECM
Interface board. See Wiring Harness Drawing
on Pg#73.
Harness wiring can be loose, based on the
options installed for the unit. See the Wiring
Harness Drawing notes for further details.
SM Series Heat Pump