Mitsubishi Electric PUHY-(E)P300, Service Handbook, Page: 33 / 302

[
II
Restrictions ]
- 24 -
HWE07010 GB
Example of wiring connection
CN51
CN3S
CN51
X
Y
L
1
L
2
ecr
uo
s r
e
wo
p
p
ma
L
Distant control
board
Relay circuit Adapter 1
Outdoor unit
control board
Preparations
in the field
Maximum cable
length is 10m
5
4
3
X Y
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.
2. Optional part : PAC-SC36NA-E or field supply.
X : Relay
Snow sensor : The outdoor fan runs when X is closed
in stop mode or thermostat mode.
X
CN3S
Preparations
in the field
Maximum cable
length is 10m
Adapter 2
Outdoor unit
control board
2
3
1
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
Relay circuit
2
CN3N
2. Optional part : PAC-SC36NA-E or field supply.
Preparations
in the field
OFF
Cooling
ON
Heating
Normal
Y
OFF
ON
X
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
X : Cooling / Heating
Y : Validity / Invalidity of X
X,Y : Relay
CN3N
X
Y
Relay circuit
Adapter 2
Outdoor unit
control board
Maximum cable
length is 10m
1
2
3
CN3D
2. Optional part : PAC-SC36NA-E or field supply.
X : Silent mode
X : Silent mode
Y : Compressor ON/OFF
X,Y : Relay Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum appicable load =< 1mA at DC
Y
X
CN3D
Preparations
in the field
Maximum cable
length is 10m
Adapter 2
Outdoor unit
control board
3
2
1
Relay circuit
2. Optional part : PAC-SC36NA-E or field supply.
X
CN3D
Preparations
in the field
Maximum cable
length is 10m
Adapter 2
Outdoor unit
control board
2
3
1
X : Relay
: The noise level is reduced by controlling the maximum
fan frequency and maximum compressor frequency.
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
Silent mode
(Night mode)
Relay circuit