Daikin RYYQ8U7Y1B, Installer And User Manual

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17 | Piping installation
Installer and user reference guide
90
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11
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 size
(mm)
Tightening torque (N•m) (when opening or closing)
Valve body Hexagonal wrench Service port
Ø9.5 5~7 4 mm 10.7~14.7
Ø12.7 8~10
Ø15.9 14~16 6 mm
Ø19.1 19~21 8 mm
Ø25.4
17.2.11 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.
p< p>
R410A N2
b c e
a
f g
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
A Valve A
B Valve B
3 Recover gas and oil from the spun piping by using a recovery unit.
CAUTION
Do NOT vent gases into the atmosphere.