36
Troubleshooting and Diagnostics
A. Compressor cannot be started, but remains silent.
"EE" code is displayed as controller and control panel communication fails.
A total of 13 fault input alarm switches, as well as 1 failure output alarm switch, are provided for
single compressor system
B. Compressor cannot be started, but makes a sound.
C. Compressor 2 cannot be started.
Possible cause
Solution
The power is not connected.
Check the following items:
a. Main power switch is off.
b. Fuse blows.
No refrigerating instruction is available.
Check the following items:
a. Main power switch is off.
b. Fuse blows.
Check the following items:
a. Thermo probe is damaged.
b. Control wiring is disconnected or improper.
c. Control power fuse blows.
Microcomputer outputs no compressor control signals.
Check the following items:
a. High voltage switch trips as a result of excessive high- voltage.
b. High voltage switch fails.
c. Low voltage switch trips as a result of insufficient coolant.
d. Flow switch or antifreezing switch trips as water valve is not
switched on.
e. Internal protection contact of fan trips.
f. Microcomputer controller goes wrong.
Electromagnetic switch of compressor fails in exciting.
Check the following items:
a. Poor function of compressor contact
b. Poor wiring
c. Open circuit of low voltage switch
Internal protection contact of compressor trips.
Check the following items:
a. Check compressor current.
b. Await restoration of internal contact (for about 10-20MIN).
Possible cause
Solution
Too low compressor voltage
Check the following items:
a. Some fuses blow.
b. Too low power voltage
c. Electromagnetic contactor of compressor goes wrong.
d. Loose wiring
Compressor failure
Check the following items:
a. Motor winding is in open circuit.
b. Phase current is excessive.
Starting voltage is inadequate (single phase type).
Check the following items:
a. Poor starting of capacitor
b. Poor starting of relay
Possible cause
Solution
No refrigeration or heating signal is available.
Check the following items:
a. Temperature switch is damaged.
b. Control wiring is disconnected or improper.
Microcomputer outputs no compressor control signals.
Please refer to the third item in Section A.
Electromagnetic switch of compressor fails in exciting.
Please refer to the fourth item in Section A.
Содержание Koolman R410A
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