To Determine The Additional Refrigerant Amount; To Charge Refrigerant - Daikin RKXYQ5T7Y1B Installation And Operation Manual

5 Installation
NOTICE
If the power of some units is turned off, the charging
procedure cannot be finished properly.
NOTICE
Be sure to turn on the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
NOTICE
If operation is performed within 12 minutes after the
compressor unit, heat exchanger unit and indoor units are
turned on, the compressor will not operate before the
communication is established in a correct way between the
compressor unit, heat exchanger unit and indoor units.
NOTICE
Before starting charging procedures, check if the 7‑LEDs
display is as normal (see
page 16), and there is no malfunction code on the user
interface of the indoor unit. If a malfunction code is
present, see "8.1 Solving problems based on error
codes" on page 22.
NOTICE
Make sure all connected units (heat exchanger unit +
indoor units) are recognised (setting [1‑5]).
5.6.2 To determine the additional refrigerant
amount
Additional refrigerant to be charged=R (kg). R should be rounded off
in units of 0.1 kg.
R=[(X ×Ø12.7)×0.12+(X ×Ø9.5)×0.059+(X
1 2
X =Total length (m) of liquid piping size at Øa
1...3
Model
RKXYQ5
When using metric piping, please take into account following table
concerning the weight factor to be allocated. It should be substituted
in the formula for R.
Inch piping
Size (Ø) (mm) Weight factor
6.4 0.022
9.5 0.059
12.7 0.12
5.6.3

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:
Installation and operation manual
12
"6.1.4 To access mode 1 or 2" on
×Ø6.4)×0.022]×0.8+B
3
B parameter (kg)
3.1
Metric piping
Size (Ø) (mm) Weight factor
6 0.018
10 0.065
12 0.097
Description
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
a
A
d
N2 R410A
B
b c e
Only circuit 1
A
B
Only circuit 2
A
B
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
The determined additional
refrigerant amount is reached
Too much refrigerant is
charged
The determined additional
refrigerant amount is not
reached yet
VRV IV compressor unit for indoor installation
Compressor unit
g
f
C
g
D
h
C
C
f
D
i
C
h
C
i
h
i
C
C
g
f
C
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.
RKXYQ5T7Y1B
4P408443-1 – 2015.07