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Mitsubishi Electric PURY-HP72 Service Handbook page 38

R410a
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[2-4 M-NET Address Settings ]
(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
X
1
Y
X
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.
(2) CN3S
External input
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.
(4) 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 appicable load =< 1mA at DC
2. Optional part : PAC-SC36NA-E or field supply.
HWE13080
External input
adapter
1 Outdoor unit
control board
CN51
Y
5
4
3
Maximum cable
length is 10m
(3) CN3N
Outdoor unit
control board
Relay circuit
CN3S
Preparations
in the field
2. Optional part :
PAC-SC36NA-E or field supply.
Outdoor unit
2
control board
CN3D
1
2
3
HP-TKMU-A-H model
External input
Distant control
Relay circuit
adapter
board
L
Y
2
Y
Preparations
Maximum cable
in the field
length is 10m
L2 : Compressor operation lamp (compressor running state)
Y : Relay (coil =<0.9W : DC12V)
1. Optional part : PAC-SC37SA-E or field supply.
3. On the TKMU-A-H models, the error signal output function is disabled
at default settings. Change the DipSW4 (No. 974) setting to use the error
signal output function. When the setting is changed, base heaters cannot
be used.
External input
adapter
2
Outdoor unit
control board
CN3N
X
1
2
Y
3
X : Cooling / Heating
Maximum cable
Y : Validity / Invalidity of X
length is 10m
X,Y : Relay
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
External input
Relay circuit
adapter
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.
- 27 -
1 Outdoor unit
control board
CN51
4
3
X
OFF
ON
OFF
Normal
Y
ON
Cooling
Heating
Outdoor unit
2
control board
CN3D
GB

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