120
8. Sequential Control For Cool Mode
The starting sequence for indoor fan, outdoor fan and compressors is shown as below:
2 seconds
Start
Indoor fan
15 seconds
2 seconds
outdoor fan 1
compressor 1*
15 seconds
2 seconds
outdoor fan 2
compressor 2*
15 seconds
2 seconds
outdoor fan 3
compressor 3*
15 seconds
2 seconds
outdoor fan 4
compressor 4*
* if available and applicable
The compressors will be turned on one by one depending on the on/off conditions shown in the above
9. Sequential control for heat mode
The starting sequence for indoor fan, outdoor fan and compressors is as shown below :
2 seconds
2 seconds
Start
Indoor fan
all 4 way valves
15 seconds
2 seconds
outdoor fan 1
compressor 1*
15 seconds
2 seconds
outdoor fan 2
compressor 2*
15 seconds
2 seconds
outdoor fan 3
compressor 3*
15 seconds
2 seconds
15 seconds
15 seconds
outdoor fan 4
compressor 4*
Heater 1*
Heater 2*
* if available and applicable
The compressors will be turned on one by one depending on the on/off conditions shown in the above.
Troubleshooting
When any air conditioner malfunction is noted, immediately switch off the power supply to the unit and
contact the local dealer, if necessary. Some simple trouble shooting tips are given below :
Trouble
Probable Cause
Suggested Action
1. Fan does not work
1. No power supply
2. Fan capacitor faulty
3. Fan motor faulty
4. Switch faulty
1. Check power supply
2. Contact local dealer
3. Contact local dealer
4. Change switch
2. Fan works, but
compressor does
not work
1. Thermostat setting too high
2. Dual pressure control trip
3. Compressor faulty
4. Compressor contactor faulty
1. Reset thermostat
2. Reset Pressure Control
3. Contact local dealer
4. Contact local dealer
3. Both fan and
compressor does
not work
1. Power failure
2. Starter trip
3. Fuse blown in power switch or operating
unit
1. Operate when power supply resume
2. Reset starter
3. Check and replace fuse
4. Air-conditioner
works but cooling
not satisfactory
1. Thermostat setting too high
2. Doors and/or windows not closed
3. Condenser coil dirty
4. Some objects blocking the inlet and/or
outlet of the unit
5. Insufficient refrigerant charge.
1. Reset thermostat
2. Close doors and/or windows
3. Contact local dealer
4. Remove the object
5. Contact local dealer
Summary of Contents for M4MC075D
Page 71: ...70 Blower Performance Curves BLOWER PERFORMANCE CURVE MDB 075D...
Page 72: ...71 BLOWER PERFORMANCE CURVE MDB 100D...
Page 73: ...72 BLOWER PERFORMANCE CURVE MDB 125D...
Page 74: ...73 BLOWER PERFORMANCE CURVE MDB 150D...
Page 75: ...74 BLOWER PERFORMANCE CURVE MDB 200D...
Page 76: ...75 BLOWER PERFORMANCE CURVE MDB 250D L s 70 65 60...
Page 77: ...76 BLOWER PERFORMANCE CURVE MDB 300D...
Page 78: ...77 BLOWER PERFORMANCE CURVE MDB 400D...
Page 79: ...78 BLOWER PERFORMANCE CURVE MDB 500D...
Page 80: ...79 BLOWER PERFORMANCE CURVE MDB 075D DR VERY HIGH STATIC...
Page 81: ...80 BLOWER PERFORMANCE CURVE MDB 100D DR VERY HIGH STATIC...
Page 82: ...81 BLOWER PERFORMANCE CURVE MDB 125D DR VERY HIGH STATIC...
Page 83: ...82 BLOWER PERFORMANCE CURVE MDB 150D DR VERY HIGH STATIC...
Page 89: ...88 MODEL MDB 500D4 DR4 NOTE 1 WITH SEQUENTIAL CONTROLLER 2 VERTICAL AIR DISCHARGE...
Page 90: ...89 Outlines And Dimensions Outdoor MODEL MMC 075 100D DR MODEL MDB 125D DR...
Page 91: ...90 MODEL MMC 150D DR OUTDOOR UNIT WITH BALL VALVE MODEL MMC 075D...
Page 92: ...91 MODEL MMC 100D MODEL MMC 125D...
Page 93: ...92 MODEL MMC 150D...
Page 97: ...96 MODEL MDB 400D4 vs MMC 100D x 4 MDB 500D4 vs MMC 125D x 4 WITH SEQUENTIAL CONTROLLER...
Page 101: ...100 MODEL MDB 400DR4 vs MMC 100DR x 4 MDB 500DR4 vs MMC 125DR x 4 WITH SEQUENTIAL CONTROLLER...
Page 102: ...101 Refrigerant Circuit Diagram MODEL MMC 075D 100D 125D 150D...
Page 103: ...102 MODEL MLC 061C...
Page 104: ...103 MODEL MMC 075DR 100DR 125DR 150DR R22 M4MC 75DR 100DR 125DR 150DR R407C...
Page 177: ...2004 McQuay International 1 800 432 1342 www mcquay com ISO 9002 REGISTERED...