18
English
NOTE
Precautions when cutting the slit holes and removing the through hole
cover:
• Open the slit holes with a cutting nippers or similar tool.
• After cutting the slit holes, it is recommended to remove burrs in the
slit holes and paint the edges and areas around the edges using the
repair paint to prevent rusting.
• When passing electrical wiring through the slit holes, protect the wiring
with a conduit or bushings, making sure not to damage the wiring.
8.2.2. 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.
3
4
1
2
1 Service port and service port
cover
2 Stop valve
3 Field piping connection
4 Stop valve cover
2
Connect the vacuuming/recovery unit to service ports of all stop
valves.
1
2
3
4
5
6
A
B
8
7
9
9
10
12
11
13
14
1 Gauge manifold
2 Nitrogen
3 Measuring instrument
4 Refrigerant R410A tank (siphon system)
5 Vacuum pump
6 Charge hose
7 Gas pipe stop valve
8 Liquid pipe stop valve
9 Outdoor unit
10 To indoor unit
11 Valve
12 Field piping
13
Gas flow
14 Stop valve service port
A Valve A
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, discon-
nect the charge hose and close the service ports.
WARNING
When brazing at the proximity of the stop valves, be sure to protect
the stop valves mounting plate with a protective plate to prevent from
contacting with the burner flame.
Gas pipe stop valve
Protective plate
Liquid pipe stop valve
Stop valves mounting plate
5
Cut off the lower part of the smaller pinched piping with an ap-
propriate tool such as pipe cutters. Let the remaining oil drip out in
case the recovery was not complete.
1
2
1 Pinched piping (small)
2 Pinched piping (large)
Wait until all oil is dripped out.
6
Cut the pinched piping (large) off with a pipe cutter just above the
brazing point or marking if there is no brazing point.
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.
7
Wait until all oil is dripped out before continuing with the connection
of the field piping in case the recovery was not complete.
Closing direction
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