Mitsubishi Electric PUHZ-FRP71VHA2R1, Руководство по обслуживанию

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36
OCH665B
Phenomena
Factor
Countermeasure
7. Remote controller display works
normally and the unit performs
heating operation, however, the
capacity cannot be fully obtained.
1 Linear expansion valve fault
Opening cannot be adjusted well due to linear
expansion valve fault.
2 Refrigerant shortage
3
Lack of insulation for refrigerant piping
4
Filter clogging
5 Heat exchanger clogging
6
Air duct short cycle
7
Bypass circuit of outdoor unit fault
1 • Discharging temperature and indoor heat
exchanger temperature does not rise.
Inspect the failure by checking
discharging pressure.
• Replace linear expansion valve.
2 • If refrigerant leaks, discharging
temperature rises and LEV opening
increases.
Inspect leakage by checking the
temperature and opening.
• Check pipe connections for gas leakage.
3
Check the insulation.
4
Open intake grille and check the filter.
Clean the filter by removing dirt or dust
on it.
5 • If the filter is clogged, indoor pipe
temperature rises and discharging
pressure increases. Check if heat
exchanger is clogged by inspecting
discharging pressure.
• Clean the heat exchanger.
6
Remove the blockage.
7
Check refrigerant system during
operation.
8. For 3 minutes after temperature
adjuster turns off, the compressor
will not start operating even if tem-
perature adjuster is turned on.
For 3 minutes after temperature
adjuster turns on, the compressor
will not stop operating even if tem-
perature adjuster is turned off.
(Compressor stops operating imme-
diately when turning off by the
remote controller.)
12
Normal operation
(For protection of compressor)
12
Normal operation
6. Remote controller display works
normally and the unit performs cool-
ing operation, however, the capacity
cannot be fully obtained. (The air
does not cool well.)
1
Refrigerant shortage
2 Filter clogging
3 Heat exchanger clogging
4
Air duct short cycle
1
• If refrigerant leaks, discharging tempera-
ture rises and LEV opening increases.
Inspect leakage by checking the tem-
perature and opening.
• Check pipe connections for gas leak-
age.
2
Open intake grille and check the filter.
Clean the filter by removing dirt or dust
on it.
3 • If the filter is clogged, indoor pipe tem-
perature rises and discharging pressure
increases. Check if heat exchanger is
clogged by inspecting discharging pres-
sure.
• Clean the heat exchanger.
4
Remove the blockage.