Emerson Liebert InteleCool 2, User Manual

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Troubleshooting
32
8.0 T
ROUBLESHOOTING
Table 18 Troubleshooting guide
Problem Probable Cause Remedy
Unit will not start
No power to unit Check voltage to input circuit breaker.
Control voltage circuit
breaker open
Locate short and reset breaker.
Shut off by external
thermostat or stat is
defective
Check operation of thermostat.
No cooling
Low refrigerant
charge
Check with gauges.
Compressor contactor
not pulling in
Check voltage at contactor. If not present refer to print and
determine voltage loss. Check enthalpy sensor for full CCW or D
setting.
No output from
thermostat
Check operation of stat. Should have voltage output to Y
terminal during cooling.
Unit cycles on
high pressure switch
Loss or restriction of
airflow
Check condenser blower assembly for proper operation. Check
for dirty coil or inlet grille restriction.
Defective fan cycling
control
Switch should make @ 240 PSIG

10 (1655 kPa ±68.9). (Check
settings on adjustable switch when supplied.)
Heat does not operate
No voltage output
from thermostat
Check stat for proper output to W terminal.
Fusible link blown Check for open and replace.
Bad contactor Check for open and replace.