Airwell CWP-CO 35 [17/42] Control system
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Airwell CWP-CO 35 [17/42] Control system

Airwell CWP-CO 04 [17/42] Control system
Page 16
6 CONTROL SYSTEM
6.1 CWP
Control system
µchiller
6.1.1 Temperature controller
The controller mounted on COOLING ONLY units is
shop calibrated to control the unit according to the
temperature of the chilled water returning from the
system. Therefore, its probe is installed in the point
where the water enters the refrigerant/water ex-
changer, so that it can detect the system load. The
only regulation required for the controller is the cali-
bration of the set point, which can be carried out in
the 10 to 18 °C range (the shop calibration is 12
°C). Regarding the units in HEAT PUMP solution, the
controller can be calibrated from 25 °C to 45 °C for
heating (the shop calibration is 40 °C); the require-
ments specified for the units in cooling only solution
shall apply also to cooling.
In order to set the cooling set point to a value lower
than the shop setting, it is essential that you add
some antifreeze to the circulating water and re-cali-
brate accordingly all the safety components of the
equipment.
N
OTE: To set the entering water temperature set
point to values below 10 °C, consult our Technical
Department to become acquainted with all the pre-
cautions that should be adopted for a perfect oper-
ation of the equipment
6.1.2 Antifreeze function
The antifreeze protection (managed by the con-
troller) is activated on all models when the leaving
water temperature drops to a value below 4 °C, and
causes the safety stop of the unit. This safety device is
a complement to the differential safety pressure
switch.
Control System
x 100
Comp
PRG
Mute
SEL
Clear
µchiller
Interfacing panel of the control system controller
Manuale CWP 4.11.2005 11:56 Pagina 16

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