MovinCool CM12 Service Manual - Manual (Page 33)

Operation Section
33
6.2 Millivolt Wall Thermostat Connection
1) Use with a single stage wall thermostat.
Thermostat type: Millivolt System
2) Set the wall thermostat to cooling system mode, since most wall thermostats are designed for
both heating and cooling.
3) Prepare the wire harness for connection from the unit to the thermostat. The recommended wire size is:
Wire Type: Thermostat cable / Solid wire 16 ~ 26 AWG
4) Identify the thermostat connectors labeled G, G1, Y, and RC.
G (Fan On/Off), G1 (Fan Speed Hi/Lo), Y (Cooling On/Off) and RC (Cooling Transfer - Common)
Connecting Thermostat to CM 12 Unit
< NOTE >
Use thermostat that is compatible with millivolt system. Do not connect thermostat to AC power source.
Wall Thermostat
Connector Name
CM 12 WIRES
Function
Label Name Color
RC RC Brown Common line for thermostat connection.
Y Y Red When both Y and G signals are ON, the compressor comes ON.
G G Orange
When the G signal is ON, the evaporator fan comes ON.
(When the signal is OFF, the evaporator fan goes OFF.)
G1 G1 Yellow
When the G1 signal is ON, the evaporator fan speed switches to Lo.
(When the signal is OFF, the evaporator fan speed switches to Hi.)
ILL00615-00
CM 12 Unit
Thermostat
(Millivolt System)
Orange Wire
G
Y
RC
G1
Red Wire
GY
W
R
C
R
H
O
B
Brown Wire
Yellow Wire
Remove Factory-Installed Jumper
Use only with thermostat that has
Fan Hi-Lo Speed control.