Daikin VRV IV RKXYQ5T8Y1B Series Installation And Operation Manual page 21

3 When the stop valve cannot be turned any further, stop turning.
4 Install the stop valve cover.
Result: The valve is now open.
To fully open the Ø19.1 mm stop valve, turn the hexagonal wrench
until a torque between 27 and 33 N•m is achieved.
Inadequate torque may cause leakage of refrigerant and breakage of
the stop valve cap.
NOTICE
Pay attention that mentioned torque range is applicable for
opening Ø19.1 mm stop valves only.
To close the stop valve
1 Remove the stop valve cover.
2 Insert a hexagon wrench into the stop valve and turn the stop
valve clockwise.
3 When the stop valve cannot be turned any further, stop turning.
4 Install the stop valve cover.
Result: The valve is now closed.
To handle the stop valve cover
▪ The stop valve cover is sealed where indicated by the arrow. Do
NOT damage it.
▪ After handling the stop valve, tighten the stop valve cover
securely, and check for refrigerant leaks. For the tightening
torque, refer to the table below.
To handle the service port
▪ Always use a charge hose equipped with a valve depressor pin,
since the service port is a Schrader type valve.
RKXYQ5T8 + RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1A – 2020.10
▪ After handling the service port, make sure to tighten the service
port cover securely. For the tightening torque, refer to the table
below.
▪ Check for refrigerant leaks after tightening the service port cover.
Tightening torques
Stop valve Tightening torque N•m (turn clockwise to close)
size (mm)
Valve body Hexagonal
wrench
Ø9.5 5.4~6.6
Ø12.7 8.1~9.9
Ø19.1 27.0~33.0
14.2.2 To remove the pinched pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
Failure to observe the instructions in procedure below
properly may result in property damage or personal injury,
which may be serious depending on the circumstances.
Use the following procedure to remove the pinched piping:
1 Make sure that the stop valves are fully closed.
2 Connect the vacuuming/recovery unit through a manifold to the
service port of all stop valves.
You have to recover gas and oil from all 4 pinched pipes. Depending
on your available tools, use method 1 (manifold with refrigerant line
splitters required) or method 2.
Manifold Connections
A
Method 1:
p < p >
Connect to all service
B
ports at once.
A
e
B
Method 2:
First connect to the
first 2 service ports.
A
B
Then connect to the
last 2 service ports.
A
B
a, b, c, d Service ports of stop valves
e Vacuuming/recovery unit
A, B, C Valves A, B and C
D Refrigerant line splitter
3 Recover gas and oil from the pinched piping by using a
recovery unit.
CAUTION
Do not vent gases into the atmosphere.
14 Piping installation
Shaft
Cap (valve Service
lid) port
4 mm 13.5~16.5 11.5~13.9
18.0~22.0
8 mm 22.5~27.5
Compressor unit
5 HP
b
a
C
a
D
b
C
c
C
c
d
D
d
C
RDXYQ
8 HP
C
b
a
a
c
b
C
RDXYQ
C
c
d
C
Installation and operation manual
d
21