HWA1-A
Air/water chillers with axial fans
11
Set-point
b08
b09
b11
b13
F
5°C
1
5°C
37°C
-17°C
G
10°C
1
8°C
40°C
-20°C
8
CIRCOLATOR MANAGEMENT
The circulator of the pump can be set according to one of the following operation modes:
-
Operation by thermo-regulator (default)
-
Operation by thermo-regulator with periodic activation
-
Continuous operation
The circulator will switch off immediately if:
-
You have a pump (circulator) in locking alarm including the manual reset flow switch alarm.
-
The unit is in stand-
by mode or when it’s switched off from
a remote input
(when it’s turned ON)
. The circulator turns off
always with a delay given by
P02
.
The circulator is always running if the antifreeze heaters are
ON
.
The circulator can be configured with the parameter
P03
in order to make it operating independently than the compressor or
under a call for operation.
P03 = 0
for
Continuous operation
P03 = 1
for operation under the thermoregulatory call
Note:
Whenever the flow switch alarm is automatically reset the pump is ON even if the compressor is off.
Otherwise, the circulator remains always in operation if the antifreeze heaters are ON or when the hydraulic pump operates in
antifreeze mode. The operation in antifreeze mode starts if the water setting temperature decreases below
P04 °C
(default value
5°C), and stops if the water setting temperature increases above
P04+P05 °C
(the default value of
P05
is
2,0°C
).
The regulation of the circulator is linear type.
8.1
Air purging of the system
This function allows the air purging of the system, to achieve this function, the circulator will run at its maximum speed.
To enable the function:
Controller in
OFF
mode
Enter at the parameters PRG
→
PSS
→
PRG
→
(introduce the maintainer password)
Press simultaneously for
3
seconds
the buttons
UP and DOWN.
The circulator of the plant will run at the maximum speed for
5 minutes
then it stops the operation.
It is possible to stop manually the air purge cycle function of the system by pressing the
MODE
/
ESC
button, or by pressing
simultaneously the
UP
and
DOWN
buttons for 3 seconds.
During this function, the flow-switch alarm is deactivated.
8.2
Operation by mean of the thermoregulator (Default)
During this operating mode (
P03=1
, default), the thermo-regulator actuates the circulator; after a time delay of
P01
seconds from
the circulator pump startup, the compressor also will turn ON. However, during the power off status, the circulator pump turns off
with a delay of
P02
minutes after shutdown status by mean of the thermo-regulator (the shutdown status is corresponding to the
off status of the compressor).
If the flow switch alarm is active in automatic reset, the pump is anyway
ON even if the compressor is off.
If you enable the operation of the unit from "
DI2
" digital input corresponding to the remote "on-off" the circulator will start
operation immediately for 2 minutes regardless of the internal thermoregulation of the unit (the activation of water recirculation
in the plant circuit leads to the correct activation of the thermoregulation).
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