About Charging Refrigerant; To Determine The Additional Refrigerant Amount; To Charge Refrigerant: Flow Chart - Daikin REYQ8T7Y1B Installation And Operation Manual

5 Installation
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) by pre-charging before the
automatic charging function can be started.
5.6.2

About charging refrigerant

Once vacuum drying is finished, additional refrigerant charging can
start.
There are two methods to charge additional refrigerant.
Method
Automatic charge "5.6.6 Step 6a: To automatically charge
refrigerant" on page 19
Manual charge "5.6.7 Step 6b: To manually charge
refrigerant" on page 20
INFORMATION
Adding refrigerant using the automatic refrigerant charging
function is not possible when Hydrobox units are
connected to the system.
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 actual automatic or
manual charging. This step is included in below procedure (see
"5.6.5 To charge refrigerant" on page
charging will take longer then.
A flow chart is available which gives an overview of the possibilities
and actions to be taken (see
chart" on page 16).
5.6.3 To determine the additional refrigerant
amount
INFORMATION
For final charge adjustment in the test laboratory, please
contact your local dealer.
NOTICE
The refrigerant charge of the system must be less than
100 kg. This means that in case the calculated total
refrigerant charge is equal to or more than 95 kg you must
divide your multiple
independent systems, each containing less than 95 kg
refrigerant charge. For factory charge, refer to the unit
name plate.
5.6.4

To charge refrigerant: Flow chart

For more information, see "5.6.5 To charge refrigerant" on
Installation and operation manual
16
See
18). It can be skipped, but
"5.6.4 To charge refrigerant: Flow
outdoor system into smaller
page 18.
Formula:
R=[(X ×Ø22.2)×0.37+(X ×Ø19.1)×0.26+(X
1 2
(X ×Ø12.7)×0.12+(X ×Ø9.5)×0.059+(X
4 5
+C)
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...6
A~C Parameters A~C
Parameter A. If the total indoor unit capacity connection ratio
(CR)>100%, charge an additional 0.5 kg of refrigerant per outdoor
unit.
Parameter B. In case of a multi-outdoor-unit system, add the sum of
the individual outdoor unit charge factors.
Model
REMQ5+REYQ8+
REYQ10+REYQ12
REYQ14
REYQ16
REYQ18
REYQ20
Parameter C. When using more than one multi BS unit, add the sum
of the individual BS unit charge factors.
Model
BS1Q10
BS1Q16
BS1Q25
BS4Q
BS6Q
BS8Q
BS10Q
BS12Q
BS16Q
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
Ø15.9 mm 0.18
Ø19.1 mm 0.26
Ø22.2 mm 0.37
×Ø15.9)×0.18+
3
×Ø6.4)×0.022]×1.04+(A+B
6
B
0 kg
1.3 kg
1.4 kg
4.7 kg
4.8 kg
C
0.05 kg
0.1 kg
0.2 kg
0.3 kg
0.4 kg
0.5 kg
0.7 kg
0.8 kg
1.1 kg
Metric piping
Piping Weight factor
Ø6 mm 0.018
Ø10 mm 0.065
Ø12 mm 0.097
Ø15 mm 0.16
Ø16 mm 0.18
Ø18 mm 0.24
Ø22 mm 0.35
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353996-1E – 2018.04