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25
INSTALLATION (cont.)
Wall Thermostat Connection
(Millivolt System ONLY: Option) (cont.)
Connecting Wall Thermostat to Unit
4. Set the wall thermostat to cooling system mode, since most wall thermostats
are designed for both heating and cooling.
5. Prepare the wire harness for connection from the unit to the thermostat.
Recommended wire type and size: Thermostat cable / Solid wire 16 ~ 26 AWG
6. Identify the thermostat connectors labeled G, Y, and RC.
G (Fan On/Off), Y (Cooling On/Off) and RC (Cooling Transfer - Common)
7. Connect the wire harness from the terminal of the unit to the thermostat
according to the labels shown below.
Note: Use thermostat that is compatible with millivolt system. Do not connect
thermostat to AC power source.
Wall Thermostat
Connector Name
Unit Connector Name Function
RC
Y
G
RC
Y
G
Common
Cool On/Off
Fan On/Off
Unit Thermostat
(Millivolt System)
G
Y
RC
GYWRCRHOB
Remove Factory-Installed Jumper
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