To Remove The Spun Pipes; Checking The Refrigerant Piping; About Checking The Refrigerant Piping - Daikin RXYLQ10T7Y1B Series Installation And Operation Manual

14 Piping installation
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 (turn clockwise to close)
size (mm)
Valve body Hexagonal
wrench
Ø9.5 5.4~6.6 4 mm
Ø12.7 8.1~9.9
Ø15.9 13.5~16.5 6 mm
Ø19.1 27.0~33.0 8 mm
Ø25.4
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.
p < p >
A B
f
a
d
N2 R410A
b c e
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.
4 When all gas and oil is recovered from the spun piping,
disconnect the charge hose and close the service ports.
Installation and operation manual
22
Shaft
Cap (valve Service
lid) port
13.5~16.5 11.5~13.9
18.0~22.0
23.0~27.0
22.5~27.5
g
5 Cut off the lower part of the gas, liquid and equalising stop
valve pipes along the black line. Use an appropriate tool (e.g. a
pipe cutter).
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the spun piping.
6 Wait until all oil has dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
14.3

Checking the refrigerant piping

14.3.1

About checking the refrigerant piping

Refrigerant piping works are
finished? No
Yes
The indoor units and/or
outdoor unit were already
No
powered ON?
Yes
Use procedure:
"Method 2: After power ON".
It is very important that all refrigerant piping work is done before the
units (outdoor or indoor) are powered on. When the units are
powered on, the expansion valves will initialise. This means that the
valves will close.
NOTICE
Leak test and vacuum drying of field piping and indoor
units is impossible when field expansion valves are closed.
Method 1: Before power ON
If the system has not yet been powered on, no special action is
required to perform the leak test and the vacuum drying.
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543426-1B – 2020.10