Specifications

IM 1059-1 / Page 21 of 36
Figure 21: MicroTech
®
III Controller with I/O Expansion
Module & Communication Module
208/230, 460, 575-60-3 (1.5 hp or less)
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