Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 32

[ II Restrictions ]
Example of wiring connection
(1) CN51
Distant control
Relay circuit
board
L
X
1
Y
L
2
Preparations
in the field
L1 : Outdoor unit error display lamp
L2 : Compressor operation lamp (compressor running state)
X, Y : Relay (coil =<0.9W : DC12V)
1. Optional part : PAC-SC37SA-E or field supply.
(3) CN3N
Relay circuit
Adapter 2
X
1
2
Y
3
Preparations
Maximum cable
in the field
length is 10m
(4) CN3D
Relay circuit Adapter 2
X
Y
Preparations
in the field
Maximum cable
length is 10m
X : Low-noise mode
Y : Compressor ON/OFF
X,Y : Relay Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum appicable load =< 1mA at DC
2. Optional part : PAC-SC36NA-E or field supply.
HWE0716A
Adapter 1
Outdoor unit
control board
CN51
X Y
5
4
3
Maximum cable
length is 10m
Outdoor unit
control board
OFF
CN3N
OFF
Y
ON Cooling
X : Cooling / Heating
Y : Validity / Invalidity of X
X,Y : Relay Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
2. Optional part : PAC-SC36NA-E or field supply.
Outdoor unit
control board
CN3D
1
2
3
(2) CN3S
Relay circuit Adapter 2
1
X
2
3
Preparations
in the field
Maximum cable
length is 10m
X : Relay
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
Snow sensor : The outdoor fan runs when X is closed
in stop mode or thermostat mode.
2. Optional part : PAC-SC36NA-E or field supply.
X
ON
Normal
Heating
Relay circuit
Adapter 2
1
X
2
3
Preparations
in the field
Maximum cable
length is 10m
X : Low-noise mode
X : Relay Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
2. Optional part : PAC-SC36NA-E or field supply.
Low-noise mode : The noise level is reduced by controlling the maximum
fan frequency and maximum compressor frequency.
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Outdoor unit
control board
CN3S
Outdoor unit
control board
CN3D
GB