Emerson Liebert PEX Series User Manual page 103

98 Chapter 8 Troubleshooting
Affiliated table 2: maintenance table (six-month)
Inspection date:
Unit model:
Filters
___ 1. Check for clogging or damage
___ 2. Check the filter clog switch
___ 3. Clean the filter
Fan
___ 1. Fan blades are not distorted
___ 2. Whether there is bearing wear
___ 3. Belt tightness and its state
___ 4. Check and fasten the circuit connector
Compressor
___ 1. Check for leakage
___ 2. Listen to the operation sound, observe the
operation vibration
___ 3. Check and fasten the circuit connections
Air-cooled condenser (if used)
___ 1. Check the fins clean
___ 2. The fan base should be firm
___ 3. The fan vibration absorber is not deteriorated
or damaged
___ 4. The SPD board should be effective (in the
storming seasons, the SPD board should be check
once a week)
___ 5. Check the voltage regulating function of the
rotation speed controller
___ 6. The temperature switch is set at the required
position
___ 7. The refrigerant pipes are properly supported
___ 8. Check and fasten the circuit connections
Water-cooled condenser (if used)
___ 1. Clean the water pipe system
Signature _________________________________________________________
Note: copy this table for filing.
___________________
___________________
Liebert.PEX2 Series Air Conditioner User Manual
Prepared by: ___________________
Unit SN: ___________________
___ 2. Check the electric valve
___ 3. Check for leakage
Refrigeration cycling system
___ 1. Check the suction pressure and suction
superheat degree
___ 2. Check the discharge pressure and
condensing subcooling degree
___ 3. Check the refrigerant pipes
___ 4. Check the moisture content (through the
sight glass)
___ 5. Check the hot gas bypass valve
___ 6. Check the thermal expansion valve
___ 7. Check whether or not refrigerant should be
added through the sight glass
Heating system
___ 1. Check the re-heater operation
___ 2. Check the erosion situation of the
components
___ 3. Check and fasten the circuit connections
Infrared humidifier
___ 1. Check clogging of the drain pipes
___ 2. Check the lamps of the infrared humidifier
___ 3. Check the mineral sediments on the water
pan
___ 4. Check and fasten the circuit connections
Electric control part
___ 1. Check the fuses and MCB
___ 2. Check and fasten the circuit connections
___ 3. Check the control program
___ 4. Check the contactor suction