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RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV System Air Conditioner
4P329765-1 – 2012.09
Installation and operation manual
18
Use the following procedure to remove the pinched piping:
1
Remove the valve cover and make sure that the stop valves are
fully closed.
2
Connect the vacuuming/recovery unit to service ports of all stop
valves.
1
Gauge manifold
2
Nitrogen
3
Measuring instrument
4
Refrigerant R410A tank (siphon system)
5
Vacuum pump
6
Charge hose
7
Refrigerant charge port
8
Gas pipe stop valve
9
Liquid pipe stop valve
A
Valve A
B
Valve B
C
Valve C
10
Outdoor unit
11
To indoor unit
12
Stop valve
13
Field piping
14
Gas flow
3
Recover gas and oil from the pinched piping by using a recovery
unit.
4
When all gas and oil is recovered from the pinched piping,
disconnect the charge hose and close the service ports.
5
In case the pinched piping lower part looks like detail A in the
figure below, follow instructions as per procedure steps 7+8.
In case the pinched piping lower part looks like detail B in the
figure below, follow instructions as per procedure steps 6+7+8.
6
For equalizing gas and gas stop valves, cut off the lower part of
the smaller pinched piping with an appropriate tool (e.g., pipe
cutter, a pair of nippers, …). Let the remaining oil drip out in case
the recovery was not complete.
Wait until all oil is dripped out.
7
Cut the pinched piping off with a pipe cutter just above the
brazing point or marking if there is no brazing point.
8
Wait until all oil is dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
10.2.3. Connecting refrigerant piping to the outdoor unit
Connection from the stop valves to the field piping can be done by
using accessory pipes supplied as accessory.
The connections to the branch kits are the responsibility of the
installer (field piping).
CAUTION
Do not vent gases into the atmosphere.
1
Service port and service
port cover
2
Stop valve
3
Field piping connection
4
Stop valve cover
3
4
1
2
13
9
1
2
4
3
5
7
14
6
12
10
8
C
B
A
11
1
Pinched piping
2
Stop valve
3
Service port
4
Point of melting the brazing
metal; cut pipe off just above
this brazing or marking point
B
A
3
2
4
1
WARNING
Never remove the pinched piping by
brazing.
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.
INFORMATION
All local inter unit piping are field supplied except the
accessory pipes.
NOTICE
Precautions when connecting field piping. Add brazing
material as shown in the figure.
NOTICE
Be sure to use the supplied accessory pipes when
carrying out piping work in the field.
Be sure that the field installed piping does not touch
other pipes, the bottom panel or side panel. Especially
for the bottom and side connection, be sure to protect
the piping with suitable insulation, to prevent it from
coming into contact with the casing.
NOTICE
Make sure that the onsite piping does not come in contact
with other piping, the bottom frame or side panels of the
unit.
1
1
1
1
2
2
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