OM 931-6 • MicroTech III Unit Controller for WSHP
21
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MicroTech III Unit Controller (Standalone) – 208/230/460/575/60Hz/3-Phase
Drawing No. 668991201
Shown with optional desuperheater
pump wiring.
Wiring diagrams are typical. For the latest drawing version
refer to the wiring diagram located on the inside of the controls
access panel of the unit.
Table B
208V
RED
230V
ORG
Note:
Gray tinted areas in the wiring diagram: Units with factory installed communication module include Discharge Air Temperature (DAT) and
Return Air Temperature (RAT) sensors shipped loose and are field installed. The Leaving Water Temperature (LWT) sensor is factory installed.
Entering Water Temperature (EWT) sensor is included with ECM and/or Secondary Electric Heat.
Legend
Item Description
C1
Capacitor-Compressor
C2
Capacitor-Fan
CC
Compressor - Contactor
CM
Compressor - Motor
CDS
Condensate Overflow Sensor
DAT
Discharge Air Temp Sensor
EWT
Entering Water Temp Sensor
HP
High Pressure Switch
HTR
Electric Heater Cartridge
IOEXP I/O Expansion Board / Harness
ISO-NC Isolation Valve - Normally Closed
ISO-NO Isolation Valve - Normally Open
LED1
LED Annunciator / Harness
LED2
LED Annunciator / Harness
LP
Low Pressure Switch
SLTS
Suction Line Temp Sensor
LWT
Leaving Water Temp Sensor
MIII
MicroTech III Main Board
R1
Relay - Fan Motor
R2
Relay - Electric Heat
RAT
Return Air Temp Sensor
RV
Reversing Valve Solenoid
TB1
Power Terminal Block
X1
Transformer
_____
Standard Unit Wiring
_ _ _ _
Optional Wiring (by others)
Notes:
Transformer:
Unused wire to be capped.
Desuperheater only available on
115-208-230V applications.
