IOM 1177 / Page 5 of 8
Installation
Field Wiring
Wiring between the sensor and the water source heat pump
unit for typical heating and cooling operation is shown in
Figure 3
.
Figure 3: Field wiring
SmartSource
™
Board
MicroTech
®
III Board
I/O Expansion
Module
Base Board
Terminal Block Label
TB2-1
TB1-1
TB1-2
TB1-3
TB1-4
TB1-5
TB3-1
TB3-2
TB1-1
Description
24V
AC
Unit Status Output
Fan & Unit Mode
Setpoint Adjust
Room
Temp Sensor &
Tenant Override
DC Signal Common
Emergency Shutdown
Input
Unoccupied Input
Dehumidification Input
Terminal Label
R
1
2
3
4
5
E
U
1
Typical Wiring
Terminal Label
1
2
3
4
5
E
U
Description
Unit Status LED Input
Fan & Unit Mode
Setpoint Adjustment
Room
Temperature
Sensor &
Tenant Override
DC Signal Common
Emergency Shutdown
Unoccupied
Adjustable Cool/Warm Room Temperature Sensor with Occupancy Switch (Part No. 910121753)
Maintenance
Wipe the display as needed with a damp water only cotton
cloth. Do not use any type of cleaner as it may damage the
buttons or scratch the display. Do not paint.
Terminal Descriptions
1 – Unit Status Indicator Input from the MicoTech III
SmartSource Unit Controller. (5VDC)
2 - Output Signal, Fan and Unit Mode (0 to 5VDC)
3 - Output Signal, Setpoint Adjustment
4 - Output Signal, Room Temp Thermistor Sensor. (10K ATP
Z curve, 10K-2)
5 - Ground or Neutral. Common Reference for All Signal
Terminals
E – Emergency Shutdown. (Terminal grounded when in
System “Off” mode, VDC only)
U - Unoccupied Contact. (Terminal grounded when in
Unoccupied, VDC only)
