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

Page: 74 / 124

Models 3.2 - 13.2, controller
µ
chiller
Blue Box - Page 68
SYMPTOM OPERATION PROBABLE CAUSE POSSIBLE CORRECTIVE ACTION
COOLING HEATING
L)
Compressor 1 and/or 2
not working (display
On with alarm “L1”
and/or “L2”) ⊗ ⊗ Refrigerant circuit
completely empty Check refrigerant circuit with
leak detector after pressurising to
approximately 4 bar. Repair leak,
apply vacuum, charge circuit.
⊗ ⊗ Low pressure switch faulty Check and replace if necessary
⊗ Metallic coil filter clogged;
air flow too low (only
LC/HP) Clean filter with compressed air
⊗ ⊗
Refrigerant filter clogged Check and replace if necessary
⊗ ⊗ Faulty water circulator
pump Check and replace if necessary
⊗ Defrost pressure switch
with incorrect setting (only
version LC/HP) Check and correct setting
⊗ ⊗ Liquid refrigerant valve not
completely open (if present)
Check and open fully
⊗ ⊗ Thermostatic expansion
valve not operating
correctly Check, clean, or replace if
necessary
⊗ ⊗ Evaporator metallic filter
clogged Clean the filter
⊗ ⊗
Evaporator circulating
pump faulty Check, and replace if necessary