Emicon EAH Use and maintenance manual - page 35
Use and Maintenance Manual Air-cooled water chillers and Heat Pumps R-PAE/R-PAH/EAH Rev. 1 del 03/09
5.4 Fault alarm and display system
The troubleshooting is realized by the microprocessor, which activates an alarm and shows on its display the
type of fault occurred (see also the attached microprocessor manual).
Since the alarm state is very often generated by an unfitted electric contact, in case of fault make sure all wiring
connections are plugged in the corresponding terminals. In case of fault, consult the attached microprocessor manual to
check the parameters setting has been done properly
.
5.5 Troubleshooting
TROUBLE
POSSIBLE CAUSE
CORRECTIVE ACTION
A) The electric panel is not powered.
Check presence of electric tension; make sure the
main switch is closed.
1. The unit does not work
B) The auxiliary circuit is not powered.
C) The microprocessor does not start the
unit
Check fuses FUT and FUA
Check the electric connections to the microprocessor
and
the
setpoint
D) The external impulse to the
microprocessor fails
Check the remote ON/OFF contact is closed
A) The unit does not work
See trouble 1
B) The control system setting is not correct
Check the setting of the control system
2. Cooled water temperature
C) The compressor does not work
See trouble 11
too high
D) The compressor output is not sufficient
See troubles 7 and 10
E) The control system does not work
Check the attached Microprocessor manual
F) Thermal load higher than estimated
Check the thermal load value
3. Cooled water temperature
too low
A) The control system setting is not correct
B) The control system does not work
Check the setting of the control system
Check the attached Microprocessor manual
C) The cooled water flow capacity is too low
See trouble 4
A) The water pump does not work
Check the pump electric connections
B) Pressure drop in the hydraulic system
Check the pressure drop and compare it with the pump
higher than estimated
head pressure
4. Cooled water flow capacity C) The pump heat protection is
activated
Check pump winding electric resistance; after reset, check
tension and electric absorption
D) Obstruction in the hydraulic circuit
Make sure filters are not clogged; check the shut-
off valves on the circuit are open.
E) Air presence in the hydraulic circuit
Discharge the air by means of the air discharge
valves on the hydraulic circuit
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