Charging Refrigerant; To Determine The Additional Refrigerant Amount - Daikin VRV W T-Series Installation Manual

5 Installation
5 .6 .2

Charging refrigerant

The outside unit is factory charged with refrigerant, but depending on
the field piping you have to charge additional refrigerant.
Make sure the outside unit's external refrigerant piping is checked
(leak test, vacuum drying).
Charging additional refrigerant typically consists of the following
stages:
1 Determining how much you have to charge additionally.
2 Charging additional refrigerant (pre-charging and/or charging).
5 .6 .3 To determine the additional refrigerant
amount
NOTE
The refrigerant charge of the system must be less than
210 lbs (100 kg). This means that in case the calculated
total refrigerant charge is equal to or more than 209 lbs
(95 kg) you must divide your multiple module system into
smaller independent systems, each containing less than
209 lbs (95 kg) refrigerant charge. For factory charge, refer
to the unit name plate.
In case of heat pump mode
Formula:
R=[(X ×Ø7/8)×0.249+(X ×Ø3/4)×0.175+(X
1 2
(X ×Ø1/2)×0.081+(X ×Ø3/8)×0.040+(X
4 5
R Additional refrigerant to be charged [in lbs and rounded off
to 1 decimal place]
X Total length [ft] of liquid piping size at Øa
1 . . .6
B Parameter [B]
C Parameter [C]
* In units of 0.1 kg, additional refrigerant to be charged=R (kg).
R=[(X1 × Φ22.2) × 0.37+(X2 × Φ19.1) × 0.26+(X3 × Φ15.9) × 0.18+(X4 ×
Φ12.7) × 0.12+(X5 × Φ9.5) × 0.059+(X6 × Φ6.4) × 0.022]+[B]
In case of heat recovery mode
Formula:
R=[(X ×Ø7/8)×0.249+(X ×Ø3/4)×0.175+(X
1 2
(X ×Ø1/2)×0.081+(X ×Ø3/8)×0.040+(X
4 5
R
Additional refrigerant to be charged [in lbs and rounded off
to 1 decimal place]
X Total length [ft] of liquid piping size at Øa
1 . . .6
A Parameter [A]
B
Parameter [B]
C Parameter [C]
* In units of 0.1 kg, additional refrigerant to be charged=R (kg).
R=[(X1 × Φ22.2) × 0.37+(X2 × Φ19.1) × 0.26+(X3 × Φ15.9) × 0.18+(X4 ×
Φ12.7) × 0.12+(X5 × Φ9.5) × 0.059+(X6 × Φ6.4) × 0.022] × 1.04+[A]+[B]
Parameter A . When using more than one multi branch selector unit,
add the sum of the individual branch selector unit charge factors.
Model
BSQ36T
BSQ60T
BSQ96T
BS4Q54T
BS6Q54T
BS8Q54T
BS10Q54T
BS12Q54T
Installation manual
26
×Ø5/8)×0.121+
3
×Ø1/4)×0.015]+[B]
6
×Ø5/8)×0.121+
3
×Ø1/4)×0.015]×1.04+[A]+[B]
6
Parameter [A]
0.1 lbs/unit (0.05 kg/unit)
0.2 lbs/unit (0.1 kg/unit)
0.4 lbs/unit (0.2 kg/unit)
0.7 lbs/unit (0.3 kg/unit)
0.9 lbs/unit (0.4 kg/unit)
1.2 lbs/unit (0.5 kg/unit)
1.6 lbs/unit (0.7 kg/unit)
1.8 lbs/unit (0.8 kg/unit)
Parameter B . If the total indoor unit capacity connection ratio>85%,
charge an additional refrigerant.
Total
Field
indoor unit
piping
Total outside unit capacity type
capacity
length
RWEQ72-
connection
144T type
ratio
≤85%
<295.3 ft
The smaller
(90 m)
>85% of [C] or 5.51
lbs. (2.5 kg)
≤85%
≥295.3 ft
(90 m)
>85%
INFORMATION
Piping length is considered by the distance from the
outside unit to the farthest indoor unit.
Parameter [C]
Indoor unit
capacity
07 09 12 15
type
Refrigerant
0.06 0.03 0.14 0.29
amount (lbs.
(0.03) (0.014) (0.06) (0.13)
(kg)/unit)
Indoor unit
FXFQ type
capacity
07 09 12 15
type
Refrigerant
0.36 0.33 0.30 0.26
amount (lbs.
(0.16) (0.15) (0.14) (0.12)
(kg)/unit)
Connection ratio requirements . When selecting indoor units, the
connection ratio must comply with the requirements shown in "3.5.2
Connection Ratio" on page 8. For more information, see the
technical engineering data.
VRV W T-Series water-cooled system air conditioner
Parameter [B]
Refrigerant amount
RWEQ168- RWEQ312-
288T type 432T type
0.0
The smaller The smaller
of [C] or 6.61 of [C] or 7.50
lbs. (3.0 kg) lbs. (3.4 kg)
0.0
2.20 lbs. (1.0 kg)
FXMQ type
18 24 30 36 48 54
0.25 0.16 0.33 0.25 0.08 0.00
(0.11) (0.07) (0.15) (0.11) (0.04) (0.00)
Others
18 24 30 36 48
0.61 0.53 0.61 0.53 0.36 0.00
(0.28) (0.24) (0.28) (0.24) (0.16) (0.00)
RWEQ96~432TAYCU
4P540122-1B – 2018.11