Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

Page: 31 / 349

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[
II
Restrictions ]
SW4-7:OFF (Compressor ON/OFF, NIGHT MODE)
SW4-7:ON (STEP DEMAND)
Example of wiring connection
CN3D 1-3P Compressor ON/OFF CN3D 1-2P NIGHT MODE
Open OFF Open OFF
Short-circuit ON Short-circuit ON
CN3D 1-2P
Open Short-circuit
CN3D 1-3P
Open 100% (not on the
on-DEMAND control)
75%
Short-circuit 0% 50%
If the step listed as the wrong example above is taken, thermo may go off.
The percentage of the demand listed in the table above is an approximate value based on the
compressor volume and does not necessarily correspond with the capacity.
(Wrong)
(Correct)
100%
100%
0%
75%
50%
50%
Demand control
steps
Note the following steps to be taken when using the STEP DEMAND
(Example) When switching from 100% to 50%
CN51
Remote controller board
Controller board on
outdoor (heat source) unit
Relay circuit
CN51
X
Y
X
Y
5
4
3
1
2
3
Maximum allowable wiring length = 10 m
L1 : Error indicator lamp/freeze prevention output
L2 : Compressor operation display lamp
X,Y : Relay (For 12V DC coil rating 0.9 W or below)
L
1
L
2
Field-installed
CN3D
Remote controller board Controller board on
outdoor (heat source) unit Relay circuit
CN3D X
Y
X
Y
Maximum allowable wiring length = 10 m
SW1 : NIGHT MODE command or Compressor ON/OFF
SW2 : Compressor ON/OFF command
X,Y : Relay (Rated contact DC 15 V 0.1 A or above
Minimum applied load 1 mA or below)
SW1
SW2
Field-installed
Lamp power supply
Relay power supply