17
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Piping installation
Installer and user reference guide
87
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
If you have a manifold…
Then
With refrigerant line
splitters
You can check both circuits at once. To do so, connect
the manifold via the splitters to both circuits, and
check.
Without refrigerant line
splitters
(takes twice as long)
You have to check the circuits separately. To do so:
▪
First connect the manifold to
circuit 1
, and check.
▪
Then connect the manifold to
circuit 2
, and check.
Possible connections:
Manifold
Connections
Compressor unit
p< p>
R410A
N2
b
c
e
a
d
B
A
Circuit 1 and 2 together
C
g
h
A
f
i
B
C
C
C
D
D
RDXYQ
RDXYQ
h
h
i
i
g
g
f
f
5 HP
8 HP
Only circuit 1
i
B
h
A
C
C
Only circuit 2
C
C
f
B
g
A
a
Pressure reducing valve
b
Nitrogen
c
Weighing scales
d
Refrigerant R410A tank (siphon system)
e
Vacuum pump
f
Liquid line stop valve (circuit 2: to indoor units)
g
Gas line stop valve (circuit 2: to indoor units)
h
Gas line stop valve (circuit 1: to heat exchanger unit)
i
Liquid line stop valve (circuit 1: to heat exchanger unit)
A, B, C
Valves A, B and C
D
Refrigerant line splitter
Valve
State of valve
Valves A, B and C
Open
Liquid line and gas line stop valves (f, g,
h, i)
Close
NOTICE
The connections to the indoor units and to the heat exchanger unit, and all indoor
units and the heat exchanger unit itself should also be leak and vacuum tested. Keep
any possible (field supplied) field piping valves open as well.
Refer to 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. If not, see also the
flow chart earlier described in this chapter (see
"About checking the refrigerant
85]).
17.3.4 To perform a leak test
The leak test must satisfy the specifications of EN378‑2.
