Daikin VRV IV RXYLQ10T7Y1B Series, Инструкция по установке и эксплуатации

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14 Piping installation
Installation and operation manual
25
RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543426-1B – 2020.10
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]+A+B
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, B Parameters A and B (see tables below)
▪ Parameter A:
In case of a multi-outdoor-unit system, add the sum of the
individual outdoor unit charge factors.
Parameter A
Piping length
(a)
CR A
8 HP 10~14 HP
≤30 m 105%<CR≤130% 0.5 kg
>30 m 105%<CR≤130% 1.2 kg 1.5 kg
(a) Piping length is considered the distance from the outdoor
unit to the farthest indoor unit
CR Total indoor unit capacity connection ratio
▪ Parameter B:
Parameter B
8+10 HP 12+14 HP
3.5 kg 3.8 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
14.4.4 To charge refrigerant: Flow chart
For more information, see "To charge refrigerant" [
4
26].
Pre-charging refrigerant
Step 1
Calculate additional refrigerant charge amount: R (kg)
Refrigerant overcharge happened, recover
refrigerant to reach R=Q
Step 2
• Open valves C and B to the liquid line
• Execute pre-charging amount: Q (kg)
Step 3a
• Close valves C and B
• Charging is finished
• Fill in the amount on the additional
refrigerant charge label
• Go to test run
Step 3b
Close valves C and B
R=Q R>Q R<Q
Continued on next page >>
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R410A N2
C
A B