EN
18
2 .6 .2
Tests and inspections
Check that the cooling system is perfectly sealed after connect-
ing the pipes.
To perform the operations described below, use a pressure
gauge unit which is specific for R410A and a vacuum pump with
a minimum flow rate of 40 l/min:
Unscrew the closure cap of the gas line service joint.
Connect the vacuum pump and the pressure gauge unit us-
ing hoses with a 5/16” fitting to the gas line service fitting.
Start the pump and open the taps of the pressure gauge unit.
Reduce the pressure to -101kPa (-755mmHg, -1bar).
Keep the pressure reduced for at least 1 hour.
Close the taps of the pressure gauge unit and switch off the
pump.
Go to step 8 if the pressure is still -101kPa (-755mmHg, -1bar)
after 5 minutes. If the pressure within the circuit has risen to
a value greater than -101kPa (-755mmHg, -1bar) search for
the leak (using a soapy solution with refrigerant circuit under
nitrogen pressure ~ 30 bar); once identified and repaired, re-
start from point 3.
Using a 4mm hexagonal spanner, open the liquid valve stem
to open it completely.
Open the gas valve stem completely using a 5 mm hexagonal
spanner.
Remove the charge hose connected to the gas pipe service
fitting.
Put the gas pipe service fitting plug back and fasten it with
a spanner.
Refit the gas and liquid service valve stem plugs and fasten
them.
If the length of the pipe is greater than 30 meter it is neces-
sary to top up the R410A gas load by 40 g per metre.
Do not open the taps if you are not certain about the sealing.
A
Pressure gauge unit
B
Vacuum gauge, where fitted
C
Vacuum pump
D
Hose tap (open)
E
Service fitting (closed)
F
Gas pipe
G
Liquid pipe
H
External unit
I
Valve stem
L
Valve stem cover
M
Loading hole
N
Main valve
Lo
Hi
A
A
D
E
H
E
C
C
I
M
N
L
B
F
G
Summary of Contents for PDC FLOOR 12T
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