Table of Contents
Advertisement
R
Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X
Total length [m] of liquid piping size at Øa
1...3
A, B
Parameters A and B
Parameters A and B:
Model
RKXYQ5
RKXYQ8
Metric piping. When using metric piping, replace the weight factors
in the formula by the ones from the following table:
Inch piping
Piping
Weight factor
Ø6.4 mm
0.022
Ø9.5 mm
0.059
Ø12.7 mm
0.12
14.4.3
To charge refrigerant
Charging refrigerant consists of 2 stages:
Stage
Stage 1: Pre-charging Recommended in case of larger systems.
Can be skipped, but charging will take longer
then.
Stage 2: Manual
Only necessary if the determined additional
charging
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
A
Circuit 1 and 2
p <
p >
together
B
f
A
i
N2
R410A
B
g
h
e
Only circuit 1
A
B
Only circuit 2
A
B
a
Liquid line stop valve (circuit 1: to heat exchanger unit)
RKXYQ5T8 + RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1B – 2021.12
A
B
0.8
3.1 kg
1.0
2.6 kg
Metric piping
Piping
Weight factor
Ø6 mm
0.018
Ø10 mm
0.065
Ø12 mm
0.097
Description
Compressor unit
5 HP
b
a
C
c
D
b
C
C
a
c
D
d
d
C
RDXYQ
C
b
8 HP
a
C
b
a
c
C
c
d
C
RDXYQ
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
The determined additional
refrigerant amount is reached
Too much refrigerant is
charged
The determined additional
refrigerant amount is not
reached yet
Stage 2: Manual charging
(= charging in the "Manual additional refrigerant charge" mode)
Summary – Manual charging:
Refrigerant bottle
Stop valves
Compressor
5 Connect as shown. Make sure valve A is closed.
p <
p >
A
b
R410A
a
c
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
d
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!
14 Piping installation
Then
Disconnect the manifold from
the liquid line(s).
You do not have to perform the
"Stage 2" instructions.
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.
Disconnect the manifold from
the liquid line(s).
Continue with the "Stage 2"
instructions.
Connected to the service port for refrigerant
charge.
This charges to both circuits, and to the
compressor unit's internal refrigerant piping.
Open
Operates
d
RDXYQ
Installation and operation manual
25
Advertisement
Table of Contents
