12
7425MUM651
Model: QBS
- Use and Maintenance Manual
Rev. 02
4
P
RELIMINARY
C
HECKS
A
ND
S
TART
-U
P
4.1
P
RELIMINARY CHECKS AND PREPARATION FOR THE FIRST START
-
UP
Before starting up the unit, it is a good idea to do the following:
•
Check that the water shut-off valves are open;
•
Verify the regular water level in the tank;
Attention!
Make sure that the tube that draws the inlet water to the pump is almost always
fluid-filled. It is also recommend, at least in the very early re-start phase, to
close the liquid outlet port of the chiller to increase the pump's prevalence.
This will avoid premature failure of the impeller and will extend the life of
mechanical seal. Also, the engine will not overheat.
•
Check that the surrounding temperature is in the range for the machine to function (see Chapter
7 Operating Limits
);
•
Check the cut-off switch on the machine switchboard is open;
•
Check that the mains voltage matches the voltage on the machine's identification plate with a
tolerance of ±10%;
•
Close the main power supply switch;
•
Close the cut-off switch on the machine's electrical panel.
4.2
S
TARTUP
Connect the device power supply. Touch the for 4 seconds. The led
will flash and turn off, the
chiller will switch on.
The controller will display the temperature of the water inside the tank - if it is higher than the set
value the compressor will start up.
To disable, touch the for 4 seconds. The led
will flash and turn on, the chiller will switch off.
4.3
S
TART
-
UP UNDER CRITICAL CONDITIONS
The consequence of starting up under critical conditions could be the intervention of the high-pressure
pressure switch (to rearm the high-pressure pressure switch, see paragraph
6.2 Rearming the high-
pressure pressure switch
).
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.