Daikin REYQ12T7Y1B - About charging refrigerant; To determine the additional refrigerant amount; To charge refrigerant: Flow chart

5 Installation
Installation and operation manual
16
REYQ8~20+REMQ5T7Y1B
VRV IV system air conditioner
4P353996-1E – 2018.04
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 See
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 18). It can be skipped, but
charging will take longer then.
A flow chart is available which gives an overview of the possibilities
and actions to be taken (see "5.6.4 To charge refrigerant: Flow
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 outdoor system into smaller
independent systems, each containing less than 95 kg
refrigerant charge. For factory charge, refer to the unit
name plate.
Formula:
R=[(X
1
×Ø22.2)×0.37+(X
2
×Ø19.1)×0.26+(X
3
×Ø15.9)×0.18+
(X
4
×Ø12.7)×0.12+(X
5
×Ø9.5)×0.059+(X
6
×Ø6.4)×0.022]×1.04+(A+B
+C)
R Additional refrigerant to be charged [in kg and rounded off
to 1 decimal place]
X
1...6
Total length [m] of liquid piping size at Øa
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 B
REMQ5+REYQ8+
REYQ10+REYQ12
0kg
REYQ14 1.3kg
REYQ16 1.4kg
REYQ18 4.7kg
REYQ20 4.8kg
Parameter C. When using more than one multi BS unit, add the sum
of the individual BS unit charge factors.
Model C
BS1Q10 0.05kg
BS1Q16 0.1kg
BS1Q25 0.2kg
BS4Q 0.3kg
BS6Q 0.4kg
BS8Q 0.5kg
BS10Q 0.7kg
BS12Q 0.8kg
BS16Q 1.1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
Ø15.9mm 0.18 Ø15mm 0.16
Ø16mm 0.18
Ø19.1mm 0.26 Ø18mm 0.24
Ø22.2mm 0.37 Ø22mm 0.35
5.6.4 To charge refrigerant: Flow chart
For more information, see "5.6.5To charge refrigerant"on page18.