Daikin RYYQ8U7Y1B, Installer And User Manual

Page: 103 / 176

17 | Piping installation
Installer and user reference guide
103
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
If Then
The additional refrigerant amount is
smaller than 10 kg Perform steps 3~4.
The additional refrigerant charge is
larger than 10 kg Perform steps 3~6.
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. The equalising line is ONLY charged to
break the vacuum. Charge it to maximally 0.05 MPa (0.5 bar), then close valve C and
disconnect its connection to the manifold. Continue pre-charging through the liquid
line only.
p< p>
R410A N2
C
D
b c e
a
g
h
f
d
A B
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 Equalising line stop valve (only for RYMQ)
A Valve A
B Valve B
C Valve C
D Valve D
4 Do one of the following:
If Then
4a The calculated additional
refrigerant amount is reached by
above pre-charging procedure Close valves D and B and disconnect
the manifold connection to the
liquid line.
4b The total amount of refrigerant
could not be charged by pre-
charging Close valves D and B, disconnect
the manifold connection to 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.
Additionally, input the additional refrigerant amount into the system via setting
[2-14].
Perform the test procedure as described in "20 Commissioning" [
4
145].