Dimplex LIA 0608HXCF M Installation And Operating Instruction page 23

LIA 0608HXCF M - LIA 1316HXCF M
7.4.2 Leakage tightness test
Connect the multi-way valve (with pressure gauges) and

dry nitrogen gas cylinder with the filling hoses on this
maintenance connection.
NOTE
A multi-way valve must be used for the leak test. If no multi-
way valve is available, an isolating valve can also be used. The
"Hi" lever on the 3-way valve must be closed at all times.
The system may be charged with max. 3.0 MPa dry nitro-

gen. The cylinder valve must be closed with a pressure of
3.0 MPa. The next step is to search for leaks with liquid
soap.
NOTE
In order to prevent liquid nitrogen from entering the cooling
system, the top side of the gas cylinder must be higher than
the bottom side when pressure is building in the system.
1) The gas cylinder is usually used in an upright position.
Check all pipe connections (indoor and outdoor) and main-
tenance valves of the air and liquid side for leaks. Bubbles
indicate a leak. The soap must be wiped away with a clean
cloth.
2) If no leaks are identified in the system, reduce the nitrogen
pressure by removing the filling hose connection from the
gas cylinder. When the system pressure is normal again,
the hose must be removed from the gas cylinder.
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7.4.3 Evacuation
1) Connect the end of the filling hose mentioned above to the
vacuum pump to pump the pipework and indoor unit
empty. The levers "Lo" and "Hi" on the multi-way valve
must be open. Start the vacuum pump. The duration of the
pumping empty process varies with different lengths of
the pipework and the pump output. The following table
shows the time required for pumping empty.
Time required for suction with a vacuum pump 0.11 m/hour.
Length of the pipework
2) Close the levers "Lo" and "Hi" on the multi-way valve at the
desired vacuum pressure and switch off the vacuum
pump.
Finally
1) Open the valve handle on the liquid side completely in an
anti-clockwise direction with a maintenance valve key.
2) Open the handle of the valve on the gas side completely in
an anti-clockwise direction.
3) Loosen the filling hose connected to the air side slightly
from the maintenance connection to reduce the pressure,
then remove the hose.
4) Tighten the screw nuts and caps on the air side mainte-
nance connection again with an adjustment key. This pro-
cess is very important to prevent leaks on the system.
5) Position the valve caps on the air and liquid side mainte-
nance valves again and tighten. The purging with the vac-
uum pump is complete. The split heat pump is now ready
for test operation.
452172.66.05-EN · FD 0306
less than 10 m
30 min. or longer
0.6 mbar or less
English
Length of the pipework
more than 10 m
60 min. or longer
EN-21