Daikin VRV IV Q+ Series Installer And User Reference Manual page 100

18 | Piping installation
Installer and user reference guide
100
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 the stop valves are closed (valve A and C, liquid and gas line).
f
a
d
b c e
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Charge hose
g Refrigerant charge port
h Gas line stop valve
i Liquid line stop valve
j Outdoor unit
k To indoor unit
l Stop valve
m Field piping
n Gas flow
o Stop valve service port
A Valve A
B Valve B
C Valve C
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.
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.
j j j
g
A
h
i
B
C
o
If
Close valve B and disconnect the
manifold connection to the liquid
line.
Close valve B, disconnect the
manifold connection to the liquid
line, and perform steps 5~6.
Then
k
l
m
n
Then
4
138].
RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546229-1A – 2020.10