Daikin VRV IV Q+ Series Installation And Operation Manual page 22

14 Piping installation
NOTICE
Pay attention that mentioned torque range is applicable for
opening Ø19.1~Ø25.4 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.
▪ 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) (when opening or
size (mm)
Valve body
Ø9.5 5~7
Ø12.7 8~10
Ø15.9 14~16
Ø19.1 19~21
Ø25.4
Installation and operation manual
22
closing)
Hexagonal Service port
wrench
4 mm 10.7~14.7
6 mm
8 mm
14.2.7 To remove the spun pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off
the spun piping.
If these instructions are NOT followed correctly it may
result in property damage or personal injury, which may be
serious depending on the circumstances.
Use the following procedure to remove the spun 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.
f
a
C
d
e
b c
a Gauge manifold
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
A Valve A
B Valve B
C Valve C
3 Recover gas and oil from the spun piping by using a recovery
unit.
CAUTION
Do not vent gases into the atmosphere.
4 When all gas and oil is recovered from the spun piping,
disconnect the charge hose and close the service ports.
5 Cut off the lower part of the gas and liquid stop valve pipes
along the black line. Use an appropriate tool (e.g. a pipe cutter).
j
i h
g
A
B
l
k m
n
RXYQQ8~20U7Y1B
VRV IV Q+ series heat pump
4P546221-1B – 2020.10