![background image](http://html1.mh-extra.com/html/daikin/rweq96tayd-series/rweq96tayd-series_installation-manual_4699714026.webp)
5 Installation
Installation manual
26
RWEQ96~432TAYD
∗
+ RWEQ96~432TATJ
∗
VRV W T-Series water-cooled system air conditioner
5 .6
Charging refrigerant
5 .6 .1
Precautions when charging refrigerant
WARNING
▪ Only use R410A as refrigerant. Other substances may
cause explosions and accidents.
▪ R410A contains fluorinated greenhouse gases. Its
global warming potential (GWP) value is 2090. Do NOT
vent these gases into the atmosphere.
▪ When charging refrigerant, always use protective
gloves and safety glasses.
NOTE
If the power of some units is turned off, the charging
procedure cannot be finished properly.
NOTE
In case of a multiple module system, turn on the power of
all outside units.
NOTE
Be sure to turn on the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
NOTE
If operation is performed within 12 minutes after the indoor
and outside units are turned on, the compressor will not
operate before the communication is established in a
correct way between outside unit(s) and indoor units.
NOTE
Before starting charging procedures, check if the
7-segment display indication of the outside unit A1P PCB
is as normal (see "7.2.4 To access mode 1 or 2" on
page 36). If a malfunction code is present, see
"10.2 Solving problems based on error codes" on page 46.
NOTE
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.
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
1
×
Ø7/8
)×0.249+(X
2
×
Ø3/4
)×0.175+(X
3
×
Ø5/8
)×0.121+
(X
4
×
Ø1/2
)×0.081+(X
5
×
Ø3/8
)×0.040+(X
6
×
Ø1/4
)×0.015]+[B]
R
Additional refrigerant to be charged [in lbs and rounded off
to 1 decimal place]
X
1 . . .6
Total length [ft] of liquid piping size at
Øa
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
1
×
Ø7/8
)×0.249+(X
2
×
Ø3/4
)×0.175+(X
3
×
Ø5/8
)×0.121+
(X
4
×
Ø1/2
)×0.081+(X
5
×
Ø3/8
)×0.040+(X
6
×
Ø1/4
)×0.015]×1.04+[A]+[B]
R
Additional refrigerant to be charged [in lbs and rounded off
to 1 decimal place]
X
1 . . .6
Total length [ft] of liquid piping size at
Øa
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
Parameter [A]
BSQ36T
∗
0.1 lbs/unit (0.05 kg/unit)
BSQ60T
∗
0.2 lbs/unit (0.1 kg/unit)
BSQ96T
∗
0.4 lbs/unit (0.2 kg/unit)
BS4Q54T
∗
0.7 lbs/unit (0.3 kg/unit)
BS6Q54T
∗
0.9 lbs/unit (0.4 kg/unit)
BS8Q54T
∗
1.2 lbs/unit (0.5 kg/unit)
BS10Q54T
∗
1.6 lbs/unit (0.7 kg/unit)
BS12Q54T
∗
1.8 lbs/unit (0.8 kg/unit)
BSF4Q54T
∗
1.4 lbs/unit (0.65 kg/unit)
BSF6Q54T
∗
1.9 lbs/unit (0.85 kg/unit)
BSF8Q54T
∗
2.2 lbs/unit (1.0 kg/unit)
01_EN_4P602454-1C.indd 26
2020/07/29 16:16:47