Mitsubishi Electric CMB-WM108V-AA Service Handbook page 45

[ II Restrictions ]
(2) Example of wiring connection
CAUTION
1) Wiring should be covered by insulation tube with supplementary insulation.
2) Use relays or switches with IEC or equivalent standard.
3) The electric strength between accessible parts and control circuit should have 2750V or more.
(1) CN51
Distant control
Relay circuit
board
L
1
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. When using a base heater, error output will not be available.
(3) CN3D
External input
Relay circuit adapter
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 applicable load =< 1mA at DC
2. Optional part : PAC-SC36NA-E or field supply.
(4) CN3K
External input
Relay circuit adapter
X
Preparations
in the field
Maximum cable
length is 10m
X : Energy-saving mode command
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.
HWE1708A
External input
adapter
1 Outdoor unit
control board
X
Y
CN51
X Y
5
4
3
Maximum cable
length is 10m
3
Outdoor unit
2
control board
CN3D
1
2
3
Outdoor unit
2
control board
CN3K
1
2
3
(2) CN3S
External input
Relay circuit
adapter
X
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.
External input
Relay circuit
adapter
X
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
2
control board
CN3S
1
2
3
Outdoor unit
2
control board
CN3D
1
2
3
GB