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Electrical Control Function
Electrical Control
105
1. Electrical Control Function
1.1 Definition
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
1.2 Main Protection
1.2.1 Time Delay at restart for compressor.
1.2.2 Sensor protection at open circuit and breaking disconnection.
1.2.3 Phase check function
If the phase sequence is detected wrong or lack of 1 or 2 phase, the unit won’t start and there is error code
displayed on outdoor PCB.
1.2.4 Low pressure check function
The low pressure switch should be always closed. If it is open, the system will stop until the fault is cleared.
During defrosting procedure and 4 minutes after defrosting ends, low pressure switch won’t be checked.
Note: The system will not check if the protection could be cleared in 30 seconds after the protection occurs.
If this protection occurs 3 times, it won’t recover automatically until the main power is cut off.
1.2.5 Over-current protection
When compressor is running, if the current is over twice of the rated for 3 seconds, the compressor will stop
and an error code will be displayed on the outdoor PCB. If the current becomes normal, the compressor will
restart after 3 minutes.
Note:
The current won’t be checked within 3 seconds after the compressor starts. The system will not check
if the protection could be cleared in 30 seconds after the protection occurs.
Summary of Contents for MHF-18HWN1-Q
Page 1: ...Contents i R410A ON OFF SERIES Service Manual 2013 LEUS B 1306...
Page 2: ......
Page 4: ......
Page 17: ...Wiring Diagrams Duct Type 13 4 Wiring Diagrams MHF 18HWN1 Q...
Page 18: ...Wiring Diagrams 14 Duct Type MHF 24HWN1 Q...
Page 19: ...Wiring Diagrams Duct Type 15 MHF 30HWN1 Q MHF 36HWN1 Q...
Page 20: ...Wiring Diagrams 16 Duct Type MHF 30HWN1 R MHF 36HWN1 R MHF 48HWN1 R MHF 60HWN1 R...
Page 21: ...Wiring Diagrams Duct Type 17...
Page 27: ...Field Wiring Duct Type 23 10 Field Wiring MHF 18HWN1 Q...
Page 32: ...Service Space 28 Ceiling Floor Type 3 Service Space...
Page 33: ...Wiring Diagrams Ceiling Floor Type 29 4 Wiring Diagrams MUE 36HRN1 Q...
Page 34: ...Wiring Diagrams 30 Ceiling Floor Type MUE 36HRN1 R MUE 48HRN1 R MUE 60HRN1 R...
Page 37: ...Field Wiring Ceiling Floor Type 33 9 Field Wiring MUE 36HRN1 Q...
Page 38: ...Field Wiring 34 Ceiling Floor Type MUE 36HRN1 R MUE 48HRN1 R MUE 60HRN1 R...
Page 45: ...Service Space Super slim Cassette Type 41 3 Service Space 1000mm 1000mm 1000mm 1000m m...
Page 46: ...Wiring Diagrams 42 Super slim Cassette Type 4 Wiring Diagrams MCD 18HRN1 Q...
Page 47: ...Wiring Diagrams Super slim Cassette Type 43 MCD 24HDN1 Q...
Page 48: ...Wiring Diagrams 44 Super slim Cassette Type MCD 36HDN1 R...
Page 49: ...Wiring Diagrams Super slim Cassette Type 45 MCD 48HDN1 R MCD 60HDN1 R...
Page 54: ...Field Wiring 50 Super slim Cassette Type 9 Field Wiring MCD 18HRN1 Q...
Page 55: ...Field Wiring Super slim Cassette Type 51 MCD 24HRN1 Q MCD 36HRN1 R MCD 48HRN1 R MCD 60HRN1 R...
Page 60: ...Wiring Diagrams 56 High Static Pressure Duct Type 4 Wiring Diagrams MHG 24HWN1 Q...
Page 61: ...Static Pressure High Static Pressure Duct Type 57 5 Static Pressure 24 000Btu h...
Page 66: ...Field Wiring 62 High Static Pressure Duct Type 10 Field Wiring MHG 24HWN1 Q...
Page 73: ...Wiring Diagrams Outdoor Units 69 4 Wiring Diagrams MOU 18HN1 Q...
Page 74: ...Wiring Diagrams 70 Outdoor Units MOU 24HN1 Q MOU 30HN1 Q...
Page 75: ...Wiring Diagrams Outdoor Units 71 MOU 30HN1 R MOU 36HN1 Q...
Page 76: ...Wiring Diagrams 72 Outdoor Units MOU 36HN1 R...
Page 77: ...Wiring Diagrams Outdoor Units 73 MOU 48HN1 R...
Page 78: ...Wiring Diagrams 74 Outdoor Units MOUA 60HN1 R...