Specifications

IM 1049-4 / Page 25 of 36
Typical Wiring Diagrams
Figure 32: MicroTech III Unit Controller with ECM Motor and Optional Communication Module – 460-60-3 Unit Sizes
024-070
Drawing No. 910102101
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)
Table B
460V/N
BLK/RED
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.
3-phase service with a neutral is required
for ECM fan motor and 460 VAC
operation.