To Charge Refrigerant - Daikin VRV IV+ RXYTQ8U5/U7YF Installation And Operation Manual

14 Piping installation
Charging refrigerant
<< Continuation of previous page
Step 4
• Connect valve A to the refrigerant charge port (d)
• Open all outdoor unit stop valves
Step 5
Proceed with manual charge
Step 6
Activate field setting [2-20]=1
Unit will start manual refrigerant charging operation.
Step 7
• Open valve A
• Charge remaining amount of refrigerant P (kg)
R=Q+P
Step 8
• Close valve A
• Push BS3 to stop manual charging
• Charging is finished
• Fill in the amount on the additional refrigerant charge label
• Go to test run
14.4.5

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
amount" [ 4 21].
refrigerant
2 The first 10 kg of additional refrigerant can be pre-charged
without outdoor unit operation.
If
The additional refrigerant amount
is smaller than 10 kg
The additional refrigerant charge
is larger than 10 kg
3 Pre-charging can be done without compressor operation, by
connecting the refrigerant bottle to the service ports of the liquid
and equalising stop valves (open valve B). Make sure that valve
A and all outdoor unit stop valves are closed.
NOTICE
During pre-charging, the refrigerant is charged through the
liquid line. Close valve A and disconnect the manifold from
the gas line.
Installation and operation manual
24
R>Q
"14.4.3 To determine the additional
Then
Perform steps 2+3.
Perform steps 2~8.
p < p >
A
d
R410A
p < p >
A B
g
f
a
d C
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
A Valve A
B Valve B
C Valve C
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
VRV IV+ heat pump for high ambient temperatures
Then
Close valves C and B and
disconnect the manifold
connection to the liquid line.
Close valves C and B,
disconnect the manifold
connection to the liquid line,
and perform steps 4~8.
RXYTQ
4P546223-1C – 2021.11