Table of Contents
(3) Both for MA remote controller and M-NET remote controller
Phenomena
1
Cooling with normal remote
controller display but not
providing capacity.
Factors
(1) Insufficient frequency rise
1 Faulty detection of pressure
sensor.
2 Higher discharge temperature
exceeding frequency limit.
3 Higher high pressure exceeding
frequency limit.
4 Low pressure excessively
lowered.
(2) Faulty action of indoor unit LEV
1 Faulty action of indoor unit LEV
does not allow sufficient flow
rate. Frequency does not rise
due to lowered low pressure.
2 Leaking LEV of stopping unit
lowers flow rate of operating unit.
(3) Abnormal speed of outdoor unit fan
1 Faulty motor or board, or heat
exchanger clogging lowers
airflow rate.
2 Faulty temperature intake of OA
sensor causes fan control
malfunction.
3 Faulty intake of pressure sensor
causes fan control malfunction.
(4) Long piping length
Pressure loss degree at pressure
side varies cooling capacity greatly.
(5) Piping size is not proper (slender)
(6) Insufficient refrigerant volume
Discharge temperature rises while
frequency does not rise.
- 156 -
Checke method & Handling
(a) Observe difference between sensor
detected pressure and actual
pressure by monitoring with LED.
→ At abnormal intake, check the
pressure sensor. (Refer to
Troubleshooting of Pressure
Sensor).
Note: Lower intake of low pressure
sensor than actual pressure
causes insufficient capacity.
SW1 setting
High pressure sensor
1 2 3 4 5
6
7 8 9 10
ON
Low pressure sensor
1 2 3 4 5
6
7 8 9 10
ON
(b) Observe difference between
evaporating temperature (Te) and
target evaporating temperature
(Tem) by monitoring with LED.
Note: Higher Te than Tem causes
insufficient capacity.
SW1 setting
Evaporating temperature Te
1 2 3 4 5
6
7 8 9 10
ON
Target evaporating temperature Tem
1 2 3 4 5
6
7 8 9 10
ON
Note: When frequency does not rise
even at higher Te than Tem,
frequency restriction by discharge
temperature or high pressure
may be affected.
At high discharge temperature
→ Refer to 1102
At high pressure
→ Refer to 1302
Refer to the page of LEV
troubleshooting ( 9.[4].6 )
Refer to the page of outdoor unit fan
troubleshooting.
Refer to the page of 5106.
Refer to the page of 1302.
Check the characteristic of capacity
decrease by piping length.
Piping pressure loss is assumable by
temperature difference between heat
exchanger outlet temperature of indoor
unit and OC evaporation temp. (Te).
→ Modify piping.
Refer to Item 1-(1) (Frequency does not
rise sufficiently.)
Refer to Item Refrigerant volume
adjustment.
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Troubleshooting
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