To Determine The Additional Refrigerant Amount - Daikin VRV IV+ Installer And User Reference Manual

18 | Piping installation

18.4.3 To determine the additional refrigerant amount

Installer and user reference guide
98
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 ×Ø22.2)×0.37+(X
1
(X ×Ø12.7)×0.12+(X ×Ø9.5)×0.059+(X
4 5
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+REYQ8~12
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:
×Ø19.1)×0.26+(X ×Ø15.9)×0.18+
2 3
×Ø6.4)×0.022]×1.04+(A+B+C)
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
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10