Specifications

IM 1060-3 / Page 21 of 32
Typical Wiring Diagrams
Figure 18: MicroTech® III Controller with I/O Expansion
Module & Communication Module – 208/230, 460, 575-60-3 (greater than 1.5 hp)
Drawing No. 910101589
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
*RA
T
Return
Air Temp Sensor
*L
WT
Leaving W
ater Temp Sensor
LP
Circuit 1 Low Pressure Switch
LP2
Circuit 2 Low Pressure Switch
SL
TS
Circuit 1 Suction Line
Temp Sensor
SLTS2
Circuit 2 Suction Line
Temp Sensor
R1
Fan Motor Starter
R
V
Circuit 1 Reversing V
alve Solenoid
R
V2
Circuit 2 Reversing V
alve Solenoid
TB1
Power
Terminal Block
X1
75 V
A Transformer
*DA
T
Discharge
Air Temp Sensor
*EWT
Entering W
ater Temp Sensor
Notes:
1.
“Run/Prg” Jumper to be in “Run” position
for normal operation
* Optional with Communication Module
MicroT
ech III Control Board
JP1
Open (Normal) Shorted (T
est 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