41
Starting up the system
2
33
A
B
C
Fig. 65
– Activate the vacuum pump. Open the valves of the
pressure gauge to start creating a vacuum in the
system.
– After 30 minutes close the valves of the pressure
gauge.
– If within 5/10 minutes the pressure gauge returns
to zero, there are leaks in the system. Proceed
with repair.
– Open the pressure gauge valves again and
continue drying for at least two hours and in any
case until a pressure dierence of 0.1 Mpa is
exceeded. Once this pressure is reached, continue
for another two hours.
– Close the pressure gauge valves.
– Stop the vacuum pump.
– If the pressure in the piping has not increased after
one hour, the procedure is over. If the pressure has
increased, there are leaks in the system.
When done, it is possible to keep the high and low
pressure hoses connected to the pressure gauge and
to the stop valves of the master unit for the purpose of
charging with refrigerant.
6.4 Charging with refrigerant
a
CAUTION
Charge the refrigerant only after having done
“6.2 Gas leak test” page 39 and “6.3 Vacuum
operation” page 40 .
a
CAUTION
Do not charge more refrigerant than necessary
because to do so can seriously compromise
the correct functioning of the refrigeration
circuit.
a
CAUTION
Use only R410A refrigerant. Charging with
other substances may cause an explosion and
fire.
m
CAUTION
When charging the refrigerant, wear suitable
PPE such as gloves and protective goggles.
m
CAUTION
Open the refrigerant containers slowly.
l
WARNING
Use only instruments and appliances designed
for use with R410A refrigerant.
l
WARNING
The refrigerant must be treated in compliance
with the regulations in force.
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