21
Cooling
System
Suction pressure and discharge pressure is normal
Confirmed that the amount of refrigerant charge is
appropriate
Whether the refrigerant leakage phenomenon
See color sight glass
Drain water tray is smooth
If there is frost expansion valve
Whether the compressor frost occurs
Whether evaporator frost occurs
Line for damage
Pipe insulation is normal
Other
Without loosening under examination terminal head
Check off whether the screws drop phenomenon
Check whether the supply voltage in the normal range
Check the floor below normal situation
Check if the indoor unit loosening
5.2.
Common Fault Alarm Phenomenon and Measures
Failure mainly for the precision air conditioning units cooling system
failure, control system failure, the ventilation system failures and
communications failures, some of Common symptoms and treatment
recommendations Table 5-2 Common alarm phenomenon and measures.
Table 5-2 Common Fault Alarm Phenomenon and Measures
Symptom
Possible Causes
Responses
The unit
does not
start
The unit is not
powered on
Check the input power supply
apparatus, the wiring is solid
Power sequence is
wrong
Check the phase sequence power
and wiring
Compressor
overload
Thermal overload
Check the air conditioning
Refrigerated space Insulation and
sealing the case, the necessary
Time Plus equipment
