Specifications

IM 1049-4 / Page 23 of 36
Typical Wiring Diagrams
Figure 30: MicroTech III Unit Controller with ECM Motor – 208 /230-60-1 Unit Sizes 024-070
Drawing No. 910104890
Legend
Item
Description
CC
Compressor - Contactor
CM
Compressor - Motor
COS
Condensate Overow Sensor
HP
High Pressure Switch
ISO-NC
Isolation V
alve - Normally Closed
ISO-NO
Isolation V
alve - Normally Open
LED1
LED
Annunciator / Harness
LP
Low Pressure Switch
SL
TS
Suction Line
Temp Sensor
LWT
Leaving W
ater Temp Sensor
MIII
MicroT
ech III Main Board
RAT
Return Air
Temp Sensor
RV
Reversing V
alve Solenoid
X1
T
ransformer
_____
Standard Unit Wiring
_ _ _ _
Optional Wiring (by others)
T
able B
208V
RED
230V
ORG
Note: Thegraytintedareasinthewiringdiagram;DischargeAir(DAT)andReturnAir(RAT)Temperaturesensorsareeld-
installedonunitsconguredwithacommunicationmodule.TheLeavingWater(LWT)sensorisunit-mountedfromthefactory.
*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.
Notes:
1.
Main board jumpers:
JP3 Geothermal
T
ransformer:
Unused wire to be capped.