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

Page: 73 / 124

Models 3.2 - 13.2, controller
µ
chiller
Blue Box - Page 67
SYMPTOM OPERATION PROBABLE CAUSE POSSIBLE CORRECTIVE ACTION
COOLING HEATING
I)
Compressor 1 and/or 2
not working (display ⊗ ⊗ Circuit overcharged (only
version LC and LC/HP) Check refrigerant charge and
remove if necessary;
On with alarm
“H1” and/or “H2”)
⊗ ⊗ High pressure switch faulty Check and replace if necessary
⊗ ⊗ Coil filters clogged; air flow
too low (version LC and
LC/HP) Clean filters with compressed air
⊗ ⊗ Presence of incondensable
gas in the refrigerant circuit Empty circuit, apply vacuum, and
recharge
⊗ ⊗
Fans faulty (version LC and
LC/HP)
Check and replace fans
⊗ ⊗ Faulty circulating pump Check and replace
⊗ Defrost-end pressure switch
not working (only version
LC/HP)
Check and replace
⊗ ⊗ Metallic filter of condenser
clogged Clean filter
⊗ ⊗ Insufficient condenser
water flow Check hydraulic circuit and
condenser water flow
⊗ ⊗ Condenser entering water
temperature too high Check condenser hydraulic circuit