Daikin VRV IV Series - Page 85

16 | Piping installation
Installer and user reference guide
85
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Manifold Connections Compressor unit
p
<
p
>
R410AN2
g h e
f
i
B
A
Circuit 1 and 2 together
C
c
b
A
a
d
B
C
C
C
D
D
RDXYQ
RDXYQ
c
c
d
d
b
b
a
a
5 HP
8 HP
Only circuit 1
a
B
bA
C
C
Only circuit 2
C
C
dB
cA
a Liquid line stop valve (circuit 1: to heat exchanger unit)
b Gas line stop valve (circuit 1: to heat exchanger unit)
c Gas line stop valve (circuit 2: to indoor units)
d Liquid line stop valve (circuit 2: to indoor units)
e Vacuum pump
f Pressure reducing valve
g Nitrogen
h Weighing scales
i Refrigerant R410A tank (siphon system)
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: