16
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Piping installation
Installer and user reference guide
85
LRYELRNUN5A7Y1
CO₂ Conveni-Pack outdoor unit
4P605460-1 – 2020.08
16.4.3 Checking refrigerant piping: Setup
a
N2
R744
a
b
b
b
b
c1 d1
E
C
A
B
D
e
f
c2 d2
A
Nitrogen (N
2
)
B
R744 refrigerant tank
C
Weighing scales
D
Vacuum pump
E
Outdoor unit
a
Pressure regulator
b
Charge hose
c1, c2
Gas side
d1, d2
Liquid side
e
To refrigeration indoor unit
f
To air conditioning indoor unit
Stop valve
Service port
Field piping
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.
16.4.4 To perform a leak test
The leak test must satisfy the specifications of EN378‑2.
1
Connect to the gas side (c) and liquid side (d) of the circuit you want to test.
See
"16.4.3 Checking refrigerant piping: Setup"
2
Pressurize both liquid side and gas side of the refrigeration circuit up to
3.0 MPa (30 bar) from the charge port of the stop valve.
3
Pressurize both liquid side and gas side of the air conditioner circuit up to
3.0 MPa (30 bar) from the charge port of the stop valve.
4
Make sure there is no pressure drop for at least 24 hours.
5
If there is a pressure drop, locate the leak and repair.
To check for leaks: Vacuum leak test
1
Evacuate the system from the liquid and gas piping to –100.7 kPa (–1.007 bar)
(5 Torr absolute) for more than 2 hours.
2
Once reached, turn off the vacuum pump and check that the pressure does
not rise for at least 1 minute.
3
Should the pressure rise, the system may either contain moisture (see vacuum
drying below) or have leaks.
