EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-G 075
- R410A - Air-cooled scroll chillers
EWAQ-
- R410A - Air-cooled scroll chillers
EWYQ-
- R410A - Air-cooled scroll heat pumps
Air and Water cooled scroll chillers & heat pump
Operation
Manual
Operation Manual
70
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
Led on the button 2 of External HMI is
blinking
String in the alarm list:
+UnitOff PvmGfpAlm
String in the alarm log:
UnitOff PvmGfpAlm
String in the alarm snapshot:
UnitOff PvmGfp Alm
Loss of one phase.
Check voltage level on each of the
phases.
Not correct sequence connection of
L1,L2,L3.
Check sequence of L1, L2, L3
connections according indication on
chiller’s electrical scheme.
Voltage level on the unit’s panel is not
in the allowed range (±10%).
Check that voltage level on each
phases is into the allowed range that
is indicated on the chiller label.
It is important to check the voltage
level on each phases not only with
chiller not running, but mainly with
chiller running from minimum capacity
up to full load capacity. That's
because voltage drop can occur from
a certain unit cooling capacity level,
or because of certain working
condition (i.e. high values of OAT);
In these cases the issue can be
related with the sizing of power
cables.
There is a short-circuit on the unit.
Check for correct electrical isolation
condition of each unit’s circuit with a
Megger tester.
6.1.3.4 Evaporator Flow Loss alarm
This alarm is generated in case of flow loss on the evaporator. This alarm protect the evaporator
against:
-
Freezing: when unit works as chiller or as heat pump with water inversion
-
High Pressure: when unit works as heat pump with gas inversion
Symptom
Cause
Solution
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
Led on the button 2 of External HMI is
blinking
String in the alarm list:
+UnitOff EvpFlwAlm
String in the alarm log:
UnitOff EvpFlwAlm
String in the alarm snapshot:
UnitOff EvpFlw Alm
No evaporator water flow sensed or
water flow too low.
Check the evaporator water pump
filler and the water circuit for
obstructions.
Check the evaporator flow switch
calibration and adapt to minimum
water flow.
Check if evaporator pump impeller
can rotate freely and it has no
damages.
Check evaporator pumps protection
devices
(circuit
breakers,
fuses,
inverters, etc.)
Check
evaporator
flow
switch
connections.
6.1.3.5 Condenser Flow Loss alarm (W/C only)
This alarm is generated in case of water flow loss to the condenser. This alarm protect the
condenser against:
-
Freezing: when unit works as heat pump with gas inversion
-
High Pressure: when unit works as chiller or as heat pump with water inversion
Symptom
Cause
Solution
