OPERATING AND MAINTENANCE MANUAL
Chapter 7 - Electronic controller
iC 215 ÷ iC 780
41
The data in this manual are not binding and they can be modified by the manufacturer without notice.
Reproduction of this manual is strictly prohibited
EN
ENGLISH
7 . 1 1 . 1 2 C h i l l e r m o d e a n t i - f r e e z e a l a r m
7 . 1 1 . 1 3 W a t e r d i f f e r e n t i a l p r e s s u r e s w i t c h a l a r m
Each time the water pump is started the water differential pressure switch alarm is disregarded for time
AL15
to allow the
hydraulic circuit to reach steady state conditions. In normal operating conditions, if the pressure switch is in alarm for time
AL17
the compressor is stopped and label
AEFL
is displayed: the water pump continues to run for additional time
AL16
after which, if the pressure switch is still in alarm, the pump is stopped.
At this point the alarm persists with manual reset so it must be reset manually.
Parameter
AL18
is the time for which the pressure switch must not be in alarm in order to allow a reset.
ATTENTION
Activation of alarm relay + buzzer occurs only if the
water differential pressure switch
alarm is active during a normal
operating stage. Otherwise exclusively an illuminated signal is generated (flashing icon).
NOTE
The alarm is always automatic reset with the unit in stand-by or remote OFF (pump stopped).
Water differential pressure switch alarm manual reset:
If the alarm features manual reset, to reset it the operator must open the functions menu (reset procedure in functions menu).
7 . 1 1 . 1 4 C o m p r e s s o r s t h e r m a l a l a r m
Chiller Operation
Display labels meaning
b1AC
(chiller mode circuit 1 anti-freeze alarm)
b1Ac
(chiller mode circuit 1 anti-freeze alarm indication)
With the alarm active and a dual circuit unit both the labels are displayed
(
b1AC
-
b2AC
/
b1Ac
-
b2Ac
).
Cause of trip
In operation and in stand-by remote OFF, if the anti-freeze control probe detects
a temperature < set
AL26
for at least
AL28
seconds.
Reset
Anti-freeze control probe detects a temperature > set
A26
+ differential
AL27
.
Reset
Automatic - becomes manual after
AL29
trips / hour (reset procedure in
functions menu).
Icon
Flashing
E
Action
The compressors are stopped and the alarm label is displayed (
b1AC b2AC
)
and the Alarm relay + buzzer are activated
Display labels meaning
AEFL
(water differential pressure switch or level sensor alarm)
Cause of trip
The alarm is not acknowledged for time
AL15
after starting of the water pump.
Alarm signalled if ID active for time
AL17
.
Reset
ID not active for time
AL18
Reset
Automatic - becomes manual if ID active for time
AL16
counted at expiry of
AL17
(reset procedure in functions menu)
Icon
Flashing Flow!
Action
Alarm relay + buzzer activated only if the water differential pressure switch
alarm is active during a normal operating stage.
Display labels meaning
C1tr
(compressor 1 thermal alarm) -…
C4tr
(compressor 4 thermal alarm)
Cause of trip
With digital input active.
The alarm is not acknowledged for
AL19
after compressor start.
Reset
If ID inactive
Reset
Manual from menu
ALrM
with password request
Icon
Flashing
E
Action
Alarm relay + buzzer activated