16
7425MUM661
Model: CWB FC
- Use and Maintenance Manual
Rev02
•
Check that the alarm symbol
does not appear on the electronic controller; if this
should happen, press the
ESC
button to display the type of alarm triggered.
Attention!
At the first start-up there could be an alarm for an incorrect sequence of
the R-S-T phases, indicated by the initials
A02
, when you press the
ESC
button.
This safety system prevents the compressors from turning in the wrong direction.
Note: the phase sequence relay located inside the electrical panel must have both
LEDS lit to confirm the correct electromagnetic field.
In this case, turn on the main power supply switch upstream from the
machine and reverse the two phases immediately downstream from the main
switch.
Attention!
Never reverse the wires downstream from the unit main switch on
the electrical panel because doing so risks changing the correct
sequence of other devices, such as, for example, the pump and
fans.
Repeat the steps from point 1.
•
Wait for the electronic controller to verify that the water flow is constant through the
signal from the differential pressure-switch; if the differential pressure-switch
intervenes (alarm code
A03
when you press the
ESC
button), vent the system,
check that the shut-off taps and the functioning of the pump are turned on; reset the
alarm by holding down the
ESC
button for 5 seconds;
•
Wait for the compressors to start.
4.2.1
Start-up under critical conditions
If the temperatures of the water and air are particularly high and outside operating limits, it is
possible that the chiller is being asked to work in conditions that are too harsh: in this case,
the
CWB FC
will partially start, i.e., they will work with only one compressor until the water
slowly returns within operating limits; only then will the machine function at full load.
To overcome this problem, you will have to reduce the thermal load on the machine by
shutting off some of the uses or, if this is not possible, by reducing the flow of water into the
evaporator: partially close the output tap from the chiller and restart the machine.
Operate the chiller under these conditions until the water temperature gradually returns
within operating limits; then, you can turn on the tap completely.
4.3 T
URNING OFF THE UNIT
To turn off the chiller, move the Start/Stop switch to the Stop position or hold down the
UP
button on the
electronic controller for at least 5 seconds (see paragraph
5.2 Turning on and off
).
Attention!
It is important to turn the unit off before the pumps, otherwise the risk of
damaging the evaporator is existing.
