Charging Refrigerant; Precautions When Charging Refrigerant; To Determine The Additional Refrigerant Amount - Daikin VRV W T Serie Manual De Instalación

3×
a
b
a Insulation material
b Caulking etc.
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 2087.5. 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
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 35). If a malfunction
"10.2 Solving problems based on error codes" on page
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.
RWEQ96~432TATJU + RWEQ96~432TAYDU
VRV W T-Series water-cooled system air conditioner
4P484115-1A – 2017.10
procedures, check if the
code is present, see
42.
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. This means that in case the calculated total
refrigerant charge is equal to or more than 209 lbs you
must divide your multiple module system into smaller
independent systems, each containing less than 209 lbs
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 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
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
Parameter B . If the total indoor unit capacity connection ratio>85%,
charge an additional refrigerant.
5 Installation
×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
A
0.1 lbs
0.2 lbs
0.4 lbs
0.7 lbs
0.9 lbs
1.2 lbs
1.6 lbs
1.8 lbs
Installation manual
25