Failure Diagnosis - Lennox ECOLEAN EAC 0091 S Installation, Operating And Maintenance

4.- MAINTENANCE

4.3.- FAILURE DIAGNOSIS

PROBLEM
The unit does not start after
the last start.
The fan does not work
(although the compressor is
operating).
The compressor stops when
the high pressure switch is cut
off.
The compressor stops when
the low pressure switch is cut
off.
The oil level in the compressor
is very low.
High noise level of compressor
and high and low pressures are
abnormal.
CAUSE
* Disconnected supply.
* Main switch set to STOP.
* No water flow.
* Fuses are broken.
* Low electrical supply.
* One of the safety devices has
been activated.
* Compressor fault.
* Low water temperature.
* Internal safety device open.
* Bad connection.
* Poor condensation control.
* Condenser coil blocked.
* Unit operating outside of limiting.
* Abnormal operation of the fans.
* Insufficient charge.
* The water exchanger is blocked
(water side).
* No water flow.
* The crank case heater is not
working.
* Phase connection for
compressor power supply
incorrectly.
ACTION
* Check electrical supply.
* Connect main switch.
* Start water pump (and check air in
system).
* Check voltage.
* Check antifreeze thermostat.
* Check high/low pressure switch.
* Change compressor.
* Create demand for cooling.
* Let the motor cool.
* Connect properly.
* Check operation.
* Maintain condenser coil.
* Check the ventilators.
* Check the charge.
* Maintain the exchanger.
* Check that there is sufficient water flow.
* Replace the crank case heater and
check oil level.
* Switch the wires between
two of the phases of
compressor power supply.
38