tyPiCal Wiring diagraMs
MicroTech III Unit Controller with PSC Motor, Desuperheater and I/O
Expansion Module for Hot Gas Reheat Control (Unit Sizes 019-070)
208/230/60/1-Phase
DrawingNo.669007101A
*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.
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.
Table B
208V RED
230V ORG
Notes:
Transformer:
Unusedwiretobecapped.
Legend
Item Description
C1 Capacitor-Compressor
C2 Capacitor-Fan
CC Compressor-Contactor
CM Compressor-Motor
COS CondensateOverowSensor
DAT DischargeAirTempSensor
EWT EnteringWaterTempSensor
HP HighPressureSwitch
HTR ElectricHeaterCartridge
IOEXP I/OExpansionBoard/Harness
ISO-NC IsolationValve-NormallyClosed
ISO-NO IsolationValve-NormallyOpen
DSHP DesuperheaterPump
HGRH 3-WayValveSolenoid
P1 24VACSupplyI/OExpansionBrd.
LED1 LEDAnnunciator/Harness
LED2 LEDAnnunciator/Harness
LP LowPressureSwitch
SLTS SuctionLineTempSensor
LWT LeavingWaterTempSensor
MIII MicroTechIIIMainBoard
R1 Relay-FanMotor
R2 Relay-ElectricHeat
RAT ReturnAirTempSensor
RV ReversingValveSolenoid
TB1 PowerTerminalBlock
X1 Primary24VACTransformer
X2 Secondary24VACTransformer
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StandardUnitWiring
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OptionalWiring(byothers)
IM 930-6 •EnnityVerticalWaterSourceHeatPumps 28 www.DaikinApplied.com