Troubleshooting; Table 40 Unit Diagnostics - Emerson Liebert CRV User Manual

17.0 T
ROUBLESHOOTING
Table 40 Unit diagnostics
Problem Possible Cause
Dirty filters
Filter clog sensor failure
Incorrect positioning of remote
temperature sensor(s)
Remote temperature sensor(s) issue
Chilled water units: inlet water
temperature is too high
Refrigerating circuit charge issue
Rack temperature
is too high
Cold air short-cycling issues
Insufficient room-cooling capacity
Chilled water-regulating valve issue
Unit safety device tripped
Compressor will not load
Low pressure condition detected
Evaporator Fans
will not modulate
from 100%
Fan control not properly set
® ™
Liebert CRV
Corrective Action
Replace filters
Call Emerson Network Power
Verify that remote temperature sensors are correctly
positioned
Verify CANbus cable connections and CANbus termination
are correct.
Adjust remote sensor mode(max/average) and number of
sensors calculated in average.
Contact your local Emerson representative
Check cooling water temperature
Contact your local Emerson representative
Verify unit positioning/room configuration
Verify unit air baffles set-up
Verify cold aisle containment seals (if applicable)
Reduce rack heat load or add cooling units
Contact your local Emerson representative
Contact your local Emerson representative
Verify air temperature setpoint and temperature control
sensor reading
Verify suction pressure in the service menus, diagnostic
service icon with the compressor loaded to 100%. If the
suction drops below 109 psi (7.5 bar), the compressor
capacity will decrease to help build suction. Verify suction
transducer reading is correct compared with a manifold
gauge.
Verify suction pressure in the service menus, diagnostic
service icon with the compressor loaded to 100%. If the
suction drops below 109 psi (7.5 bar), the fan speed will
increase to help build suction. Verify suction transducer
reading is correct compared with a manifold gauge.
Contact your local Emerson representative
See 11.3 Liebert CRV Operation—Liebert iCOM Control
Contact your local Emerson representative
172

Troubleshooting

®