Blue Box SIGMA 2002 - Page 75

Models 3.2 - 13.2, controller µchiller
Blue Box - Page 69
SYMPTOM OPERATION PROBABLE CAUSE POSSIBLE CORRECTIVE ACTION
COOLING HEATING
M)
Compressor 1 and/or 2
not working (display
On with alarm
⊗ ⊗
Insufficient refrigerant
charge
Find leak with leak detector,
repair, and recharge circuit
“C1” and/or “C2”)
⊗
4-way valve locked Replace valve
⊗ ⊗
Lack of oil Check quantity of oil in circuit
and replenish as necessary.
Check that the circuit has all the
necessary measures to ensure oil
return to the compressor
⊗ ⊗
Condenser entering water
temperature too high
Check temperature and flow of
condenser entering water
N)
Ice on liquid refrigerant
pipe
⊗ ⊗
Liquid refrigerant filter
clogged
Replace filter
⊗ ⊗
Valve on liquid refrigerant
line (if present) not
completely open
Open valve fully
O)
Compressors run
constantly
⊗ ⊗
Operating thermostat
incorrectly set or faulty
Check setting; replace
thermostat if necessary
⊗ ⊗
Lack of refrigerant gas
charge
Check and recharge if necessary
⊗ ⊗
Excess thermal load Reduce thermal load