Daikin VRV IV+ Installer And User Reference Manual page 103

REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
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 port of the liquid stop valve (open valve B).
Make sure that all outdoor unit stop valves, as well as valves A, C, and D are
closed.
NOTICE
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.
p < p >
A B
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
D Valve D
4 Do one of the following:
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
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.
Additionally, input the additional refrigerant amount into the system via setting
[2-14].
Perform the test procedure as described in "21 Commissioning" [
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 outdoor unit
stop valves. At this point, valve A must remain closed!
Perform steps 3~4.
Perform steps 3~6.
C D
h
g
f
If
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.
18 Piping installation
|
Then
Then
4
145].
Installer and user reference guide
103