Mitsubishi Electric PUHY-P200 Service Handbook page 77

11. Operation mode
(1) Indoor unit operation modes
An operation mode can be selected from the following 5 modes on the remote controller.
1
Cooling mode
2
Heating mode
3
Dry mode
4
Fan mode
5 Stopping mode
(2) Outdoor unit operation mode
1 Cooling mode
2 Heating mode
3 Stopping mode
Note : If the outdoor unit is already in the cooling mode, other indoor units
(in stopping mode, fan mode, thermo OFF) will not run a heating operation
when directed to do so, and "HEAT" on the remote controller will blink.
When the outdoor unit is already in the heating mode, the reverse will be true.
(The first selection made on the remote controller has the priority.)
12. Demand control
Cooling/heating operation can be prohibited (thermo OFF) by an external input to the indoor units.
Note : When DIPSW4-7 are on, STEP DEMAND are possible. NIGHT MODE will become unavailable however.
SW4-7 : OFF (Compressor ON/OFF and NIGHT MODE)
CN3D 1-3P Compressor ON/OFF
OPEN
SHORT
SW4-7 : ON (STEP DEMAND)
CN3D 1-2P
CN3D 1-3P
OPEN
SHORT
Note the following steps to be taken when using the STEP DEMAND
(Example) When witching from 100% to 50%
Demand control
steps
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.
[ Example of wiring connection ]
Remote controller board
SW1
SW2
To be
acquired
on site
SW1 : NIGHT MODE or demand command
SW2 : Demand command
X,Y : Relay (contact rating DC1mA)
All indoor units in operation are in cooling mode.
All indoor units in operation are in heating mode.
All indoor units are in fan mode or stopping mode.
CN3D 1-2P
OPEN
ON
SHORT
OFF
OPEN
100% (no demand)
0%
→ NO
(Wrong) 100% 0%
OK
→
(Correct) 100% 75%
Adaptor for external input
(PAC-SC36NA)
Relay circuit
Orange 1
Brown
X
2
X
Red
Y
3
Y
Maximum allowable length of wiring is 10 m.
- 75 -
NIGHT MODE
OFF
ON
SHORT
75%
50%
→
50%
→
50%
Outdoor unit
controller board
CN3D