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Thermostat Connection Diagrams
Mark IV/AC Units – Unit Sizes 007 to 019
Non-Programmable Electronic Thermostat (P/N 668054201)
7-Day Programmable Electronic Thermostat (P/N 107095901)
Includes Thermostat and Wall Plate.
Refer to the installation, operation &
application guide (LIA217) for thermostat
107095901 installation details
Optional Remote Sensor (P/N 667720401)
1. Remove cover from remote sensor housing.
2. Select an appropriate location for mounting the remote
sensor.
3. Mount remote sensor unit using hardware provided.
4. Install two strand shielded wire between remote sensor
and thermostat. Shielded wire must be used.
Do not run remote sensor wire in conduit with other wires.
• Wire 1 should run between the S1 terminal on the
thermostat and the S1 terminal on the remote sensor
• Wire 2 should run between the S2 terminal on the
thermostat and the S2 terminal on the remote sensor
• Connect the shielding of the wire to the S2 terminal on
the thermostat
5. Disable the main sensor (R12) on the thermostat by
cutting it from the circuit board.
S1
S2
S1
S2
Cut R12 from
circuit board
Remote Sensor
Thermostat
Wire 1
Wire 2
WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit1)
OW2GW1Y1 F E L U A P V R C
RCW1Y1 W2 Y2 G
Thermostat Terminals
WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit1)
OW2GW1Y1 F E L U A P V R C
RCW1Y1 W2 Y2 G O
Thermostat Terminals
Override (Optional)
Includes Thermostat and Wall Plate.
Refer to the installation, operation &
application guide (LIA204-4) for
thermostat 668054201 installation details
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