The Following Symptoms Are Normal - Mitsubishi Electric PURY-P72 Service Handbook

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[VIII Test Run Mode
1
[6] The following symptoms are normal.
Symptoms
Remote controller
Cause
display
The indoor unit does not start "Cooling (heating)" The unit cannot perform a heating (cooling) operation when other indoor
after starting cooling (heating) icon blinks on the units are performing a cooling (heating) operation.
operation. display.
The auto vane adjusts its posi- After an hour of cooling operation with the auto vane in the vertical posi-
tion by itself. tion, the vane may automatically move into the horizontal position.
Normal display Louver blades will automatically move into the horizontal position while
the unit is in the defrost mode, pre-heating stand-by mode, or when the
thermostat triggers unit off.
The fan stops during heating
Defrost
The fan remains stopped during defrost operation.
operation.
The fan keeps running after
Unlit
When the auxiliary heater is turned on, the fan operates for one minute
the unit has stopped. after stopping to dissipate heat.
The fan speed does not reach The fan operates at extra low speed for 5 minutes after it is turned on or
the set speed when operation
STAND BY
until the pipe temperature reaches 35
D
C[95
D F],
then it operates at low
switch is turned on. speed for 2 minutes, and finally it operates at the set speed.
(Pre-heating stand-by)
When the main power is
The system is starting up. Wait until the blinking display of "Hon or
turned on, the display shown
"HO" or "PLEASE "PLEASE WAIT" go off.
on the right appears on the in- WAIT" icons blink
door unit remote controller for on the display.
5 minutes.
The drain pump keeps run- The drain pump stays in operation for three minutes after the unit in the
ning after the unit has
Unlit cooling mode is stopped.
stopped.
The drain purnp is running When drain water is detected, the drain pump goes into operation even
while the unit is stopped. while the unit is stopped.
Indoor unit and
Be
controller This noise is made when the refrigerant circuit is reversed and is normal.
make noise during cooling!
Normal display
heating changeover.
Sound of the refrigerant flow is This is caused by the transient instability of the refrigerant flow and is nor-
heard from the indoor unit im-
Normal display
mal.
mediately after starting opera-
tion.
Warm air sometimes comes This is due to the fact that the LEVs on some of the indoor units are kept
out of the indoor units that are
Normal display
slightly open to prevent the refrigerant in the indoor units that are not op-
not in the heating mode.
erating in the heating mode from liquefying and accumulating in the com-
pressor. It is part of a normal operation.
HWE0803A
- 162-
GB