Panasonic S-45PU1E5 Technical Data & Service Manual page 665

4 Check the
4-1 Outdoor air intake temperature is high.
situation
May be caused by poor outdoor unit air flow
4-2
(dirty or clogged heat exchanger, blocked discharge port, etc.)
Air short circuit has occurred. This is a phenomenon when
4-3 discharged air (exhaust heat) from the outdoor unit is drawn back
into the suction vent.
4-4 Indoor air intake temperature is high.
4-5 The filter of the indoor unit is clogged.
Air short circuit has occurred. This is a phenomenon when
4-6 discharged air (exhaust heat) from the indoor unit is drawn back
into the suction vent.
5 Check
5-1 Possible to operate.
operation
5-2 Operating pressure is affected by pressure overload.
5-3 Tends to have an overcharge of refrigerant in the system.
5-4 Tends to operate for a long time turning gas back into liquid.
5-5 Tends to have insufficient refrigerant charge in the system.
Even though the high pressure saturation temperature is 43°C or
5-6 less, the secondary current of the inverter is high.
(The frequency (Hz) ends up dropping due to the current.)
6 Check
Dividing the outdoor EEPROM INV operation time by the number
6-1
history
of times oil was supplied to the system yields 3 hours or less.
There is a history of H31 in the pre-trip counter of the outdoor
6-2
EEPROM alarm history.
7 Check the
The results of HIC board IPM Pass/Fail Tests show the outside the
7-1
HIC boards
range of the resistance of a conforming part listed in the next page.
8 Check the
compressor
8-1 The compressor is causing a failure in the insulation.
The winding resistance of the compressor is abnormal.
Standard winding resistance
Single-phase model
(2.5hp – 3hp)
8-2
U-W :
V-W :
Single-phase model
(4hp – 6hp)
U-V : 0.720 ohm U-V :
0.726 ohm U-W :
0.708 ohm V-W :
hp: horse power
3-phase model
0.490 ohm U-V : 1.061 ohm
0.495 ohm U-W : 1.079 ohm
0.483 ohm V-W : 1.050 ohm
5-57
Yes Take measures
No 4-2
Yes Correct
No 4-3
Prevent air short
Yes
circuit
No 4-4
Yes Take measures
No 4-5
Yes Clean the filter
No 4-6
Prevent air short
Yes
circuit
No 5-1
Yes 5-2
No 6-1
Yes 5-3
No 5-4
Adjust the amount
Yes
of refrigerant
No 5-4
Check the operation
Yes
of functional parts
No 5-5
Adjust the amount
Yes
of refrigerant
No 5-6
Replace the
Yes
compressor
No See what happens.
Yes 6-2
No 6-2
Replace the
compressor and add
Yes oil. However if 6-1
was "no," it is not
necessary to add oil.
No 7-1
Yes Replace HIC board
No 8-1
Replace the
Yes
compressor
No 8-2
Replace the
Yes
compressor
No 9-1
5