Inputs And Outputs - Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet

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INPUTS AND OUTPUTS

4. System component
OUTDOOR UNIT WIRING
4-2. Outdoor unit input/output connector
INPUTS AND OUTPUTS (CITY MULTI ONLY)
Caution:
4-2-1. Output
• State (CN51)
Distant control
board
L
1
L
2
4-2-2. Input
Y, R2 series
(1) Step demand and Low noise mode (CN3D)
For details, refer to "Table 4-1-2."
Relay circuit
X
Y
Preparations
in the field
X : Low noise mode or demand
Y : Demand
X,Y : Relay
*2. Optional part : PAC-SC36NA-E or field supply.
(3) Autochangeover (CN3N) (R2 excluded)
Relay circuit
Adapter *2
X
Y
Preparations
Maximum cable
in the field
length is 10m
X : Cooling / Heating
Y : Validity / Invalidity of X
X,Y : Relay
Contact rating voltage >= 15VDC
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
*2. Optional part : PAC-SC36NA-E or field supply.
OFF
Y
ON Cooling
40
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.
Relay circuit Adapter *1
Outdoor unit
control board
X
Y
CN51
X Y
5
4
3
Preparations
Maximum cable
in the field
length is 10m
Outdoor unit
Adapter *2
control board
CN3D
1
2
3
Maximum cable
length is 10m
Contact rating voltage >= 15VDC
Contact rating current >= 0.1A
Minimum appicable load =< 1mA at DC
(4) Snow sensor (CN3S)
Outdoor unit
control board
CN3N
1
2
3
X : Relay
*2. Optional part : PAC-SC36NA-E or field supply.
Snow sensor : The outdoor fan runs when X is closed
X
OFF ON
Normal
Heating
L1 : Outdoor unit error display lamp
L2 : Compressor operation lamp (compressor running state)
X, Y : Relay (coil =<0.9W : 12VDC)
*1. Optional part : PAC-SC37SA-E or field supply.
(2) Low noise mode (CN3D + DipSW4-4 OFF)
Relay circuit
X
Preparations
in the field
X : Relay
Contact rating voltage >= 15VDC
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
*2. Optional part : PAC-SC36NA-E or field supply.
Low noise mode : The sound pressure level is reduced by controlling
-Note-
The sound pressure level can not be reduced, when neither
the fan frequency nor the compressor frequency are maximum.
Outdoor unit
Relay circuit Adapter *2
control board
CN3S
1
X
2
3
Preparations
in the field
Maximum cable
length is 10m
Contact rating voltage >= 15VDC
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
in stop mode or thermostat mode.
Outdoor unit
Adapter *2
control board
CN3D
1
2
3
Maximum cable
length is 10m
the maximum fan frequency and compressor frequency.
(5) Energy-saving mode (CN3K)
External input
Relay circuit adapter *2
1
2
3
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 appicable load =< 1mA at DC
*2. Optional part : PAC-SC36NA-E or field supply.
AN1 2nd
Outdoor unit
control board
CN3K