15
English
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
C
B
9
8
10
10
11
13
12
14
15
7
1 Pressure reducing valve
2 Nitrogen
3 Measuring instrument
4 Refrigerant R410A tank (siphon system)
5 Vacuum pump
6 Charge hose
7 High/low pressure gas pipe stop valve
8 Suction gas pipe stop valve
9 Liquid pipe stop valve
10 Outdoor unit
11 To Branch Selector unit (indoor unit)
12 Stop valve
13 Field piping
14
Gas flow
15 Stop valve service port
A Valve A
B Valve B
C Valve C
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.
Liquid pipe stop valve
Suction gas pipe stop value
Protective plate
Stop valves mounting plate
High/low pressure gas
pipe stop valve
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.
Wait until all oil is dripped out.
6
Cut the pinched piping 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.
8.2.3. Connecting refrigerant piping to the outdoor unit
•
All pipings for gas and liquid over from the field connection piping kit
are field supplied.
Front connection
Remove the knockout hole of the piping intake and connect piping
to the piping intake.
1
3
2
4
5
4
Open knockout
hole here
1 Liquid pipe stop valve
2 Suction gas pipe stop valve
3 High/low pressure gas pipe stop valve
4 Filed connection piping kit (accessory)
5 Knockout hole
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