13
D. Motor cuts out on overload.
1. The dryer is working outside its
rating.
2. The dryer is working under bad
conditions for air-cooled
condenser.
3. The cooling circuit is not
working with the right
refrigerant charge.
1a. Check the flow rate of treated air.
1b. Check the room temperature.
1c. Check the air temperature at the dryer
inlet.
2a. Clean the condenser.
*2b. Check the operation and the
calibration of the fan cycling press.
Switch.
*2c. Check the operation of the fan.
*3a. Check if there are leaks of
refrigerating gas.
*3b. Charge it again.
E. The motor hums and does not
start.
1. The line voltage is too low.
2. The machine was switched off
and on again without leaving
enough time for pressure
balancing.
3. The starting system of the motor
is defective.
1a. Contact the electric power company.
2a. Wait a few minutes before starting the
machine again.
*3a. Check the running and starting relays
and condensers (if installed).
F. The machine (compressor) has
stopped and does not restart
even after a few minutes.
1. The overload protection has
intervened: see B2, B3 and C3
above.
2. The compressor motor has
burned out.
1a. See remedies above.
2a. Replace.
G. The compressor is very noisy.
1. Trouble with the internal
mechanical parts or with the
valves.
1a. Repair or replace.
Table 3 — Troubleshooting Guide, continued
Symptoms
Cause
Remedy
Summary of Contents for QPNC Series
Page 16: ...14 QPNC 75 External Parts List...
Page 18: ...16 QPNC 75 Internal Parts List...
Page 20: ...18 QPNC 100 125 External Parts List...
Page 22: ...20 QPNC 100 125 Internal Parts List...
Page 24: ...22 QPNC 150 200 250 External Parts List...
Page 26: ...24 QPNC 150 200 250 Internal Parts List...
Page 28: ...26 QPNC 75 Dimensional Drawing...
Page 29: ...27 QPNC 100 125 Dimensional Drawing...
Page 30: ...28 QPNC 150 to 250 Dimensional Drawing...
Page 31: ...29 QPNC 75 115V Wiring Diagram...
Page 32: ...30 QPNC 75 230V Wiring Diagram...
Page 33: ...31 QPNC 100 125 115V Wiring Diagram...
Page 34: ...32 QPNC 100 125 230V Wiring Diagram...
Page 35: ...33 QPNC 150 175 200 250 Wiring Diagram...
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