The Following Phenomena Do Not Represent Trouble (Emergency); Specifications - Mitsubishi Electric CITY MULTI PUMY-71 Manuel D'installation

For M-NET remote controller systems
Symptoms or inspection code
The operation is shown on the display
but some of the indoor units will not
operate.
The remote controller goes off soon
even if indoor unit operates.
Power on indicator ( ) on remote
controller not on. (No power supplied
to M-NET remote controller.)
The "HO" on the remote controller
goes out or if the "HO" repeats regu-
larly (normally, the "HO" is displayed
for a maximum of 3 minutes after the
outdoor unit has been turned on).
The power on display ( ) is displayed
on the remote controller but it does not
operate.

9.4. The following phenomena do not represent trouble (emergency)

Phenomenon
Indoor unit does not start even if cool-
ing (heating) operation is selected.
The auto vane runs freely.
Fan setting changes during heating.
Fan stops during heating operation.
No setting of fan while start SW has
been turned on.
Indoor unit remote controller shows
"HO" indicator for about 3 minutes when
turning ON universal power supply.
Drain pump does not stop while unit has
been stopped.
Drain pump continues to operate while
unit has been stopped.

10. Specifications

Item Model
Rated cooling capacity
Rated heating capacity
Rated power supply voltage
Size (height × width × depth)
Air flow rate
Operation noise
Weight
* "(+30)" specified for the depth indicates the projecting dimension of the fan guard.
The rated capacities conform to the test conditions specified in JISB8616.
Cooling: Indoor: 27°CDB/19°CWB
• There is an address miss for an indoor unit in the same group or for the
remote controller.
• The initial registration of the remote controller in the different refrigerant group-
ings was not performed.
• The power to the indoor unit has not been turned on.
• Fuse burnt out on controller circuit board for indoor unit.
• The power to the outdoor unit has not been turned on.
• The indoor/outdoor transmission cable has a short or is broken.
• M-NET remote controller is connected to the MA remote controller cable.
• The M-NET remote controller cable has shorted or is broken.
• The permissible number of indoor units within a refrigerant system has been
exceeded or permissible number of remote controllers connected has been
exceeded.
• The power for the power supply expansion unit for the transmission wire is
not on.
• The MA remote controller is connected to the indoor/outdoor unit transmis-
sion cable.
• There is an address setting miss for an indoor unit or for the remote control-
ler.
• The address for the outdoor unit remains at "00".
• The indoor/outdoor transmission cable has a short, broken wire or bad con-
nection.
• The indoor/outdoor transmission cable for the indoor/ outdoor units is con-
nected to TB7.
Display of remote controller
" ( )" blinks.
Normal display
Normal display
"DEFROST"
"STAND BY "
"HO" flashes
Light out
—
Unit PUMY-71VM
kW 8.0
kW 9.0
Single phase 220-240V, 50 Hz / 220V, 60Hz
1,280 × 900 × 320 (+30)
mm
m 3 /min 95
dB <A> 52
kg 102
Outdoor: 35°CDB
Cause
The indoor unit cannot cool (heat) if other indoor units are heating (cool-
ing).
Because of the control operation of auto vane, it may change over to
horizontal blow automatically from the downward blow in cooling in case
the downward blow operation has been continued for 1 hour. At de-
frosting in heating, hot adjusting and thermostat OFF, it automatically
changes over to horizontal blow.
Ultra-low speed operation is commenced at thermostat OFF.
Light air automatically changes over to set value by time or piping tem-
perature at thermostat ON.
The fan is to stop during defrosting.
Ultra low-speed operation for 5 minutes after SW ON or until piping
temperature becomes 35°C, low speed operation for 2 minutes there-
after, and then set notch is commenced. (Hot adjust control)
System is being driven.
Operate remote controller again after "HO" disappears.
After a stop of cooling operation, the unit continues to operate the drain
pump for three minutes and then stops it.
Unit continues to operate drain pump if drainage is generated, even
during a stop.
PUMY-125VM
14.0
16.0
1,280 × 1,020 × 350 (+30)
90
54
130
Heating: Indoor: 20°CDB
Inspection method and solution
• Check the following as possible causes of
the error.
• Entire system
• Within entire refrigerant system
• Within same group only
• Only one indoor unit
(a) If entire system and within entire refrig-
erant system
• Check the self-diagnosis LEDs on the
outdoor unit.
• Check those items shown to the left
that are related to the outdoor unit.
(b) If within same group only and only one
indoor unit
• Check those items shown to the left
that are related to the indoor unit.
Cause
PUMY-125YM (A)
14.0
16.0
3 phase 380-415V, 50Hz/380V, 60Hz
1,280 × 1,020 × 350 (+30)
90
54
127
Outdoor: 7°CDB/6°CWB
21