To Determine The Additional Refrigerant Amount; To Charge Refrigerant - Daikin RXYSQ6T8VB Installer And User Manual

NOTICE
Before starting charging procedures, check if the 7‑LEDs
display is as normal (see
page 29), and there is no malfunction code on the user
interface of the indoor unit. If a malfunction code is
present, see "11.3 Solving problems based on error
codes" on page 39.
NOTICE
Make sure all connected indoor units are recognised
(setting [1‑5]).
NOTICE
Close the front panel before any refrigerant charge
operation is executed. Without the front panel attached the
unit cannot judge correctly whether it is operating properly
or not.
NOTICE
In case of maintenance and the system (outdoor unit+field
piping+indoor units) does not contain any refrigerant any
more (e.g., after refrigerant reclaim operation), the unit has
to be charged with its original amount of refrigerant (refer
to the nameplate on the unit) and the determined additional
refrigerant amount.
6.7.3 To determine the additional refrigerant
amount
INFORMATION
For final charge adjustment in a test laboratory, contact
your dealer.
Formula:
R=[(X ×Ø9.5)×0.059+(X ×Ø6.4)×0.022]
1 2
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...2
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
Connection ratio requirements. When selecting indoor units, the
connection ratio must comply with the following requirements. For
more information, see the technical engineering data.
(a)
Indoor units Total CR
VRV DX 50~130%
RA DX 80~130%
(a) Total CR = Total indoor unit capacity connection ratio
(b) CR per type = Allowable capacity connection ratio per
indoor unit type
6.7.4

To charge refrigerant

To speed up the refrigerant charging process, it is in case of larger
systems recommended to first pre-charge a portion of refrigerant
through the liquid line before proceeding with the manual charging. It
can be skipped, but charging will take longer then.
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1 – 2017.04
"7.2.4 To access mode 1 or 2" on
Metric piping
Piping Weight factor
Ø6 mm 0.018
Ø10 mm 0.065
(b)
CR per type
VRV DX RA DX
50~130% —
— 80~130%
Pre-charging refrigerant
Pre-charging can be done without compressor operation, by
connecting the refrigerant bottle to the service port of the liquid stop
valve.
1 Connect as shown. Make sure that all outdoor unit stop valves,
as well as valve A are closed.
p < p >
A B
g
f
a
d C
N2
b c e
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
A Valve A
B Valve B
C Valve C
2 Open valves C 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
Charging refrigerant (in manual additional refrigerant charge
mode)
The remaining additional refrigerant charge can be charged by
operating the outdoor unit by means of the manual additional
refrigerant charge mode.
5 Connect as shown. Make sure valve A is closed.
6 Installation
Then
Disconnect the manifold from
the liquid line.
You do not have to perform the
"Charging refrigerant (in
manual additional refrigerant
charge mode)" instructions.
Recover refrigerant.
Disconnect the manifold from
the liquid line.
You do not have to perform the
"Charging refrigerant (in
manual additional refrigerant
charge mode)" instructions.
Disconnect the manifold from
the liquid line.
Continue with the "Charging
refrigerant (in manual
additional refrigerant charge
mode)" instructions.
Installer and user reference guide
23