15
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Piping installation
Installer and user reference guide
98
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
NOTICE
The connections to the indoor units and all indoor units should also be leak and
vacuum tested. Keep any possible (field supplied) field piping valves open as well.
Also see the indoor unit installation manual for more details. Leak test and vacuum
drying should be done before the power supply is set to the unit.
15.4.4 To perform a strength pressure test and leak test
The test must satisfy the specifications of EN378‑2.
Prerequisite:
To prevent the safety valve from opening during the test, do the
following:
▪
Remove the safety valve(s) and, if present, the changeover valve.
▪
Install a cap (field supplied) onto the treaded piece.
1
Connect to the gas side (c) (e) and liquid side (d). See
2
Pressurise both liquid side and gas side from service ports SP3, SP7 and SP11.
Always test the pressure according to EN378-2 and mind the set pressure of
the pressure relief valve (if installed). Recommended test pressure for the
liquid and the gas side: 1.1 Ps (99 bar gauge).
3
Make sure there is no pressure drop.
4
If there is a pressure drop, locate the leak, repair it and repeat the test.
15.4.5 To perform vacuum drying
1
Connect a vacuum pump to service ports SP3, SP7 and SP11. See
"15.4.3 Checking refrigerant piping: Setup"
2
Vacuum the unit for at least 2 hours and to –100.7 kPaG (-1.007 bar gauge) or
below.
3
Leave the unit for more than 1 hour with a vacuum pressure of –100.7 kPaG
(-1.007 bar gauge) or less. On the vacuum gauge, check if the pressure does
not increase. If the pressure rises, the system has a leak or moisture remained
into the piping.
4
If the test was successful, replace the cap on the threaded piece with the
changeover valve (if applicable) and safety valve(s).
WARNING
To ensure that the safety valve(s) and the changeover valve are properly reinstalled,
a leak test is mandatory.
In case of a leak
1
Find and repair the leak.
2
When done, perform the leak test and vacuum test again. See
perform a strength pressure test and leak test"
98] and
98].
In case of remaining moisture
When the unit is installed on rainy days, moisture may still remain in the piping
after a first vacuum drying is performed. If so, conduct the following procedure:
1
Pressurise the nitrogen gas up to 0.05 MPa (for vacuum destruction) and
vacuum for at least 2 hours.