Specifications

Page 20 of 32 / IM 1060
Figure 17: MicroTech
®
III Controller with I/O Expansion
Module & Communication Module
208/230, 460, 575-60-3 Unit Sizes 096-120
Drawing No. 910101586
Legend
Item Description
CC1 Circuit 1 Compressor Contactor
CC2 Circuit 2 Compressor Contactor
CM1 Circuit 1 Compressor
CM2 Circuit 2 Compressor
 COS CondensateOverowSensor
HP Circuit 1 High Pressure Switch
HP2 Circuit 2 High Pressure Switch
IOEXP I/O Expansion Board / Harness
LED1 LED Annunciator / Harness
LED2 LED Annunciator / Harness
*RAT Return Air Temp Sensor
*LWT Leaving Water Temp Sensor
LP Circuit 1 Low Pressure Switch
LP2 Circuit 2 Low Pressure Switch
SLTS Circuit 1 Suction Line Temp Sensor
SLTS2 Circuit 2 Suction Line Temp Sensor
R1 Fan Motor Starter
RV Circuit 1 Reversing Valve Solenoid
RV2 Circuit 2 Reversing Valve Solenoid
TB1 Power Terminal Block
X1 75 VA Transformer
*DAT Discharge Air Temp Sensor
*EWT Entering Water Temp Sensor
Notes:
1. “Run/Prg”Jumpertobein“Run”position
for normal operation
* Optional with Communication Module
Typical Wiring Diagram
MicroTech III Control Board
JP1 Open(Normal)Shorted(TestMode)
JP2 Shorted
JP3
 Open(StdRange)
  Shorted(GeothermalRange)
JP4 Spare
JP5 Open
JP6 Open
JP7 Spare
JP8 Spare
I/O Expansion Module
JP1 Shorted
JP2 Open
JP3 Open
JP4 Open
JP5 Open
JP6 Open
JP7 Spare
JP8 Spare