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Piping installation
Installer and user reference guide
92
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
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
2
Open valves C (on line of B) and B.
3
Pre‑charge refrigerant until the determined additional refrigerant amount is
reached or pre‑charging is not possible anymore, and then close valves C and
B.
4
Do one of the following:
If
Then
The determined additional refrigerant
amount is
reached
Disconnect the manifold from the
liquid line(s).
You do not have to perform the
"Stage 2" instructions.
Too much
refrigerant is charged
Recover refrigerant until the
determined additional refrigerant is
reached.
Disconnect the manifold from the
liquid line(s).
You do not have to perform the
"Stage 2" instructions.
The determined additional refrigerant
amount is
not reached
yet
Disconnect the manifold from the
liquid line(s).
Continue with the "Stage 2"
instructions.
Stage 2: Manual charging
(= charging in the "Manual additional refrigerant charge" mode)
Summary – Manual charging
:
