Daikin VRV IV+ - To Determine the Additional Refrigerant Amount

18 | Piping installation
Installer and user reference guide
98
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
18.4.3 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+REYQ8~12 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: