Specifications

IM 1060 / Page 23 of 32
Thermostat Connections
Figure 20: 7-Day Programmable Electronic
Thermostat (P/N 668375301)
Notes: Includes Thermostat and Wall Plate.
Refer to the installation, operation & application guide
(LIA265) for thermostat 668375301.
Figure 21: Non-Programmable Electronic
Thermostat (P/N 668375401)
Note: Includes Thermostat and Wall Plate.
Refer to the installation, operation & application guide
(LIA266) for thermostat 668375401.
*When remote reset of a lockout condition is required
at the wall thermostat, it will be necessary to utilize
a conductor between terminal "O" on the wall
thermostat to terminal "O" on the MicroTech III unit
controller (non-programmable stat only).
Optional Remote Sensor (P/N 66720401)
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.
Figure 22: Optional Remote Sensor Wiring
MicroTech III Wall-Mounted Room Temperature Sensors
(P/N 668900801, 669088201, 669088101)
Figure 23: MicroTech III Wall-Mounted Room
Temperature Sensors (669088201 Not Shown)
General
Microtech III Wall-Mounted Room Temperature Sensors
provide electronic sensing of room temperatures at
wall locations. All sensor models feature a thermistor
(10kΩ)andagreenLEDforunitstatus.Tenantoverride,
setpoint adjustment potentiometer, thermometer, and a
communications port are optional features available in
any combination.
This manual provides general information for the
Microtech III Wall-Mounted Room Temperature
Sensors. For installation instructions refer to IM 955.
MicroTech III Unit Control Board
Low Voltage Terminal Strip (Circuit 1)
W1
Y1
W2
Y2
G
Thermostat
Terminals
-
C
TB2
24VAC
Alarm Output
Heat 2
Heat 1
Cool 2
Cool 1
Fan
Tenant Override
24VAC Common
C
O
G
Y1
Y2
W1
W2
A
R
+
R
MicroTech III Unit Control Board
Low Voltage Terminal Strip (Circuit 1)
W1
Y1
W2
Y2
G
Thermostat
Terminals
-
C
TB2
24VAC
Alarm Output
Heat 2
Heat 1
Cool 2
Cool 1
Fan
Tenant Override
24VAC Common
C
O
G
Y1
Y2
W1
W2
A
R
+
R
O
*Override(Optional)
S1
S2
S1
S2
Cut R12 from
circuit board
Remote Senso
r
Thermostat
Wire 1
Wire 2
Sensor 668900801
Sensor 669088101
When the optional room temperature sensor is connected
totheunitcontroller,theReturnAirTemperature(RAT)
sensor must not be installed. The room temperature sensor
and return air temperature sensor must not be connected
simultaneously or the unit will not operate properly.
CAUTION