Daikin VRV IV i Series, Инструкция по установке и эксплуатации, Страница: 25 / 48

14 Piping installation
Installation and operation manual
25
RK RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1B – 2021.12
R Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X
1...3
Total length [m] of liquid piping size at Øa
A, B Parameters A and B
Parameters A and B :
Model A B
RKXYQ5 0.8 3.1 kg
RKXYQ8 1.0 2.6 kg
Metric piping. When using metric piping, replace the weight factors
in the formula by the ones from the following table:
Inch piping Metric piping
Piping Weight factor Piping Weight factor
Ø6.4 mm 0.022 Ø6 mm 0.018
Ø9.5 mm 0.059 Ø10 mm 0.065
Ø12.7 mm 0.12 Ø12 mm 0.097
14.4.3 To charge refrigerant
Charging refrigerant consists of 2 stages:
Stage Description
Stage 1: Pre-charging Recommended in case of larger systems.
Can be skipped, but charging will take longer
then.
Stage 2: Manual
charging Only necessary if the determined additional
refrigerant amount is
not reached yet by
pre-charging.
Stage 1: Pre-charging
Summary – Pre-charging :
Refrigerant bottle Connected to the service ports of the stop
valves. Which stop valves to use depends
on the circuits you choose to pre-charge to:
▪ Circuits 1 and 2 together (manifold with
refrigerant line splitters required).
▪ First circuit 1, then circuit 2 (or vice versa).
▪ Only circuit 1
▪ Only circuit 2
Stop valves Closed
Compressor Does NOT operate
1 Connect as shown (choose one of the possible connections).
Make sure that all compressor unit stop valves, as well as valve
A are closed.
Possible connections:
Manifold Connections Compressor unit
p< p>
R410A N2
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
b A
C
C
Only circuit 2
C
C
d B
c A
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 :
Refrigerant bottle Connected to the service port for refrigerant
charge.
This charges to both circuits, and to the
compressor unit's internal refrigerant piping.
Stop valves Open
Compressor Operates
5 Connect as shown. Make sure valve A is closed.
p< p>
R410A
a c
b
A
d
RDXYQ
a Weighing scales
b Refrigerant R410A tank (siphon system)
c Vacuum pump
d Refrigerant charge port
A Valve A
NOTICE
The refrigerant charging port is connected to the piping
inside the unit. The unit's internal piping is already factory
charged with refrigerant, so be careful when connecting
the charge hose.
6 Open all compressor unit stop valves. At this point, valve A
must remain closed!