To Charge Refrigerant - Daikin VRV W T-Series Installation Manual

5 Installation
5 .6 .4

To charge refrigerant

Follow the steps as described below.
Pre-charging refrigerant
1 Calculate the additional amount of refrigerant to be added using
the formula mentioned in "5.6.3 To determine the additional
refrigerant amount" on page 26.
2 The first 22 lbs (10 kg) of additional refrigerant can be pre-
charged without outside unit operation:
If
The additional refrigerant amount
is smaller than 22 lbs (10 kg)
The additional refrigerant charge
is larger than 22 lbs (10 kg)
3 Pre-charging can be done without compressor operation, by
connecting the refrigerant bottle to the service port of the liquid
stop valve (open valve B). Make sure that all outside unit stop
valves, as well as valves A, C, and D are closed.
NOTE
During pre-charging, the refrigerant is charged through the
liquid line only. Close valves C, D, and A and disconnect
the manifold from the gas line and the high pressure/low
pressure gas line.
C
(1)
p < p >
h
A B
g
f
a
d
N2 R410A
b c e
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g
Gas line stop valve
h High pressure/low pressure gas line stop valve
A Valve A
B Valve B
C Valve C
(1)
D Valve D
(1) Only for heat recovery mode.
NOTE
Do not connect the vacuum pump to the suction gas stop
valve if the unit is intended to run in heat pump mode. This
will increase the risk of unit failure.
4 Do one of the following:
If
4a The calculated additional
refrigerant amount is reached
by above pre-charging
procedure
4b The total amount of
refrigerant could not be
charged by pre-charging
Installation manual
28
Then
Perform steps 3~4.
Perform steps 3~6.
D
Then
Close valve B and disconnect
the manifold from the liquid
line.
Close valve B, disconnect the
manifold from the liquid line,
and perform steps 5~6.
INFORMATION
If the total additional refrigerant amount was reached in
step 4 (by pre-charging only), record the amount of
refrigerant that was added on the additional refrigerant
charge label provided with the unit and attach it on the
back side of the front panel.
Perform the test
"8 Commissioning" on page 41.
Charging refrigerant
5 After pre-charging, connect valve A to the refrigerant charge
port and charge the remaining additional refrigerant through this
port. Open all outside unit stop valves. At this point, valve A
must remain closed!
p < p >
A
d
b
R410A
a c
a
Weighing scales
b Refrigerant R410A tank (siphon system)
c Vacuum pump
d Refrigerant charge port
A Valve A
INFORMATION
For a multi outside unit system, it is not required to connect
all charge ports to a refrigerant tank.
The refrigerant will be charged with ±48.6 lbs (22 kg) in 1
hour time at an outside temperature of 86°FDB (30°CDB)
or with ±13.3 lbs (6 kg) at an outside temperature of
32°FDB (0°CDB).
If you need to speed up in case of a multiple module
system, connect the refrigerant tanks to each outside unit.
NOTE
▪ The refrigerant charging port is connected to the piping
inside the unit. The unit's internal piping is already
factory charged with refrigerant, so be careful when
connecting the charge hose.
▪ After adding the refrigerant, do not forget to close the lid
of the refrigerant charging port. The tightening torque
for the lid is 8.48 to 10.25 ft·lbf (11.5 to 13.9 N·m).
▪ In order to ensure uniform refrigerant distribution, it
may take the compressor ±10 minutes to start up after
the unit has started operation. This is not a malfunction.
The remaining additional refrigerant charge can be charged by
operating the outside unit by means of the manual refrigerant charge
operation mode:
6 Take all the precautions mentioned in "7 Configuration" on
page 35 and "8 Commissioning" on page 41 into account.
7 Turn on the power of the indoor units and outside unit.
8 Activate outside unit setting [2-20]=1 to start manual refrigerant
charge mode. Refer to "7.2.8 Mode 2: Field settings" on page 37
for details.
Result: The unit will start operation.
9 Valve A can be opened. Charging of remaining additional
refrigerant can be done.
10 When the remaining calculated additional refrigerant amount is
added, close valve A and push BS3 to stop the manual
refrigerant charging procedure.
VRV W T-Series water-cooled system air conditioner
procedure as described
RWEQ96~432TAYCU
4P540122-1B – 2018.11
in