The most common causes of air conditioner failure to “start" are:
a) Voltage not within
±
10% of rated voltage.
b) Power supply interrupted.
c) Control settings improper.
d) Air conditioner is disconnected from main power source.
e) Fuse blown or circuit breaker off.
ii) Diagnosis of Refrigerant Circuit / Application
There might be some cases where the unit starts running but does not perform satisfactory, i.e.
insufficient cooling. Judgement could be made by measuring temperature difference of indoor
unit's intake and discharge air as well as running current.
Insufficient Cooling
Unit Starts
Excessive heat
source e.g. electric
kettle
High cool load
Refrigerant circuit
Leakage
Restriction e.g. at
strainer, capillary,
filter dryer, etc.
Compressor
Less or no compression
(Low running current)
Room overcrowded
with people
Windows / doors
wide open
Check air circulation
Indoor/Outdoor coil dirty
(clogged)
Air filters dirty
Fan Malfunction
Obstruction at air inlet/outlet
of indoor/outdoor unit
Satisfactory operation with temperature difference of
air intake & discharge of indoor unit 8°C - 13°C
Insufficient Heating
Unit Starts
High heat load
Refrigerant circuit
Leakage
Restriction e.g. at
strainer, capillary,
filter dryer, etc.
Compressor
Less or no compression
(Low running current)
Windows / doors
wide open
Check air circulation
Indoor/Outdoor coil dirty (clogged)
Air filters dirty
Fan Malfunction
Obstruction at air inlet/outlet
of indoor/outdoor unit
Satisfactory operation with temperature difference of
air intake & discharge of indoor unit 14°C - 20°C
86
Содержание MCM 020 D
Страница 21: ...Refrigerant Circuit MODEL MCM020D MLC M4LC020B MODEL MCM025D MLC M4LC025B MCM030D M4LC030B Page 20...
Страница 23: ...MODEL MCM020DR MLC M4LC020BR MODEL MCM025DR MLC M4LC025BR MCM030DR MLC030BR Page 22...
Страница 41: ...MODEL MLC M4LC061 C CR Page 40...
Страница 42: ...Wiring Diagrams COOLING ONLY INDOOR UNIT MODEL MCM020 025D OUTDOOR UNIT MODEL MLC M4LC020 025B Page 41...
Страница 43: ...INDOOR UNIT MODEL MCM030D OUTDOOR UNIT MODEL MLC030B Page 42...
Страница 44: ...INDOOR UNIT MODEL MCM030D OUTDOOR UNIT MODEL MLC M4LC030C Page 43...
Страница 45: ...INDOOR UNIT MODEL MCM040D OUTDOOR UNIT MODEL MLC035C Page 44...
Страница 46: ...INDOOR UNIT MODEL MCM040 050D OUTDOOR UNIT MODEL MLC M4LC040 050C Page 45...
Страница 47: ...INDOOR UNIT MODEL MCM061 062C OUTDOOR UNIT MODEL M4LC060C Page 46...
Страница 48: ...INDOOR UNIT MODEL MCM061 062C OUTDOOR UNIT MODEL MLC M4LC061C Page 47...
Страница 49: ...HEAT PUMP INDOOR UNIT MODEL MCM020 025DR OUTDOOR UNIT MODEL MLC M4LC020 025BR Page 48...
Страница 50: ...INDOOR UNIT MODEL MCM030DR OUTDOOR UNIT MODEL MLC030BR Page 49...
Страница 51: ...INDOOR UNIT MODEL MCM030DR OUTDOOR UNIT MODEL MLC M4LC030CR Page 50...
Страница 52: ...INDOOR UNIT MODEL MCM040DR OUTDOOR UNIT MODEL MLC035CR Page 51...
Страница 53: ...INDOOR UNIT MODEL MCM040 050DR OUTDOOR UNIT MODEL MLC M4LC040 050CR Page 52...
Страница 54: ...INDOOR UNIT MODEL MCM061 062CR OUTDOOR UNIT MODEL MLC M4LC061CR Page 53...
Страница 55: ...INDOOR UNIT MODEL MCM061 062CR OUTDOOR UNIT MODEL MLC M4LC060CR Page 54...
Страница 61: ...LOW AMBIENT UNIT OPTIONAL OUTDOOR UNIT MODEL MLC010B 015B 50HZ OUTDOOR UNIT MODEL MLC020B 025B 50HZ Page 60...
Страница 63: ...SINGLE PHASE FOR 4HP OUDOOT UNIT MODEL MLC M4LC040C COOLING ONLY MODEL MLC M4LC040CR HEATPUMP Page 62...
Страница 68: ...MCM061 062C Figure C Provide the installation space as shown in Figure D MCM D MCM061 062C Figure D Page 67...
Страница 94: ...2004 McQuay International 1 800 432 1342 www mcquay com ISO 9002 REGISTERED...