Specifications

Page 24 of 36 / IM 1059-1
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 26: Optional Remote Sensor Wiring
MicroTech III Wall-Mounted Room Temperature Sensors
(Kit P/N 669529101, 669529201, 669529001)
Figure 27: MicroTech III Wall-Mounted Room
Temperature Sensors (669529201 Not Shown)
General
Microtech III Wall-Mounted Room Temperature Sensors
provide electronic sensing of room temperatures at wall loca-
tions.Allsensormodelsfeatureathermistor(10kΩ)andagreen
LED for unit status. Tenant override, setpoint adjustment poten-
tiometer, 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
When the optional room temperature sensor is connected
to the unit controller, the Return Air Temperature (RAT) sen-
sor
must not be installed. The room temperature sensor and
return air temperature sensor must not be connected simulta-
neously
or the unit will not operate properly.
Thermostat Connections
Figure 24: 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 25: 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.
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 669529101
Sensor 669529201 Not Shown
Sensor 669529001
CAUTION