Blue Box SIGMA 2002, Installation, Installation, Operating, Operating, And Maintenance Manual

Page: 75 / 124

Models 3.2 - 13.2, controller
µ
chiller
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