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P
Q
To outdoor/indoor/MDC
units comm. bus
XT2
To wired controller
comm. bus
Occupancy sensor/ON-OFF
(Dry contact)
Display board
RED
WHITE
B
LUE
E
L B
ACK
LEGEND:
NOTE: Field wiring must use copper conductors only.
ACB
— Auxiliary Control Board
ALARM
— Warning Lamp
AUXH
— Output for Auxiliary Heat
CS
— Condensate Switch
CTON
— Output for Cooling Operation
EEV
— Electronic Expansion Valve
FAN
— Output for Fan Operation
FM
— Indoor Fan Motor
HTON
— Output for Heating Operation
PUMP
— Pump Motor
SVD
— Solenoid Valve
T1/T0
— Room Temperature Sensor
T2A
— Inlet Pipe Temperature Sensor
T2B
— Outlet Pipe Temperature Sensor
XP1-8
— Connectors
XS1-4
— Connector
XT1-2
— Terminal Block
---------- Optional Component or Field Wiring
P
Q
ACB interface
CN50
WHITE
B
LUE
CN51
CN51
FAN CTON HTON AUXH
( Current range: 0-1A)
( Voltage range: 0-24V AC/DC)
" +5V GND +12V "
ONLY USED
FOR TESTING
CN14
CN12
CN11 CN5
CN52
CN54
SW8
CN2{L_IN}
EARTH
CN3 CN18
CN4{N_IN}
ALARM
L1 L2
XT1
POWER IN
Fig. 20 —40VMH072 - 096 Typical Wiring Diagram
ON/OFF
SWITCH
CN27
CN24
RED
CN57+
BLACK
CN58-
BLUE
BLUE
CN29
CN20
PUMP
SVD
15
FM
CN3
CN3
BLUE
CN13
CN13
BLACK
-
~
BLUE
RED
FM
~
+
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