To Remove The Pinched Pipes; Checking The Refrigerant Piping; About Checking The Refrigerant Piping - Daikin RXYTQ8T7YF Installer And User Manual

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
6.4.11

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 Remove the valve cover and make sure that the stop valves are
fully closed.
a
b
c
d
a Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
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
RXYTQ8~16T7YF
VRV IV system air conditioner
4P388989-1B – 2016.02
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
B Valve B
3 Recover gas and oil from the pinched piping by using a
recovery unit.
CAUTION
Do not vent gases into the atmosphere.
4 When all gas and oil is recovered from the pinched piping,
disconnect the charge hose and close the service ports.
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, a pair of nippers).
WARNING
Never remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
6 Wait until all oil is dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
6.5

Checking the refrigerant piping

6.5.1

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 they will close. Leak test and vacuum drying of field
piping and indoor units is impossible when this happens.
Therefore, there will be explained 2 methods for initial installation,
leak test and vacuum drying.
6 Installation
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
Installer and user reference guide
21