11
GB
D
F
E
I
NL
P
GR
RU
TR
CZ
SV
SL
HG
PO
D
<B>
<A>
F
G
E
A
F
G
C
E
A
O
S
<B>
<A>
D
D
B
567
<C>
A
B
12
<C>
98
<C>
43
<C>
567
<C>
34
<C>
A
B
10.2. Precautions concerning piping connec-
tion and valve operation
•
Conduct piping connection and valve operation accurately and carefully.
•
Removing the pinched connecting pipe
When shipped, a pinched connecting pipe is attached to the on-site liquid and
gas valves to prevent gas leakage.
Take the following steps
1
through
4
to remove the pinched connecting pipe
before connecting refrigerant pipes to the outdoor unit.
1
Check that the refrigerant service valve is fully closed (turned clockwise all
the way).
2
Connect a charging hose to the service port on the liquid/gas refrigerant
service valve, and extract the gas in the pipe section between the refriger-
ant service valve and the pinched connecting pipe.
3
After vacuuming gas from the pinched connecting pipe, sever the pinched
connecting pipe at the location shown in [Fig.10.2.1] and drain the refriger-
ant.
4
After completing
2
and
3
heat the brazed section to remove the pinched
connecting pipe.
[Fig. 10.2.1]
• P72, 96
• P120, 144
<A> Refrigerant service valve (liquid side/brazed type)
<B> Refrigerant service valve (gas side/brazed type)
A
Shaft
Fully closed at the factory, when connecting the piping, and when vacuuming.
Open fully after these operations are completed.
<When opening>
• Turn the shaft counterclockwise with a hexagonal wrench.
• Turn around the shaft until it stops.
<When closing>
• Turn the shaft clockwise with a hexagonal wrench.
• Turn around the shaft until it stops.
B
Shaft
Fully closed at the factory, when connecting the piping, and when vacuuming.
Open fully after these operations are completed.
<When opening>
• Turn the shaft counterclockwise.
• Turn around the shaft until it stops.
<When closing>
• Turn the shaft clockwise.
• Turn around the shaft until it stops.
C
Stopper pin
Prevents the shaft from turning 90˚ or more.
D
Service port
Available for gas venting of the pinched connecting pipe, or vacuuming in the
refrigerant pipes on the site.
E
Cap
Remove the cap before operating the shaft. Be sure to return it to the original
position after completing the operation.
F
Pinched connecting pipe severing portion
G
Pinched connecting pipe brazing portion
<Refrigerant piping connection examples>
[Fig.10.2.2]
Warning:
•
The sections between the refrigerant service valves and the pinched con-
necting pipes are filled with gas and refrigerant oil. Extract the gas and
refrigerant oil in the above-mentioned pipe section before heating the
brazed section to remove the refrigerant service valve pinched connect-
ing pipe.
- If the brazed section is heated without first extracting the gas and refrigerant
oil, the pipe may burst or the pinched connecting pipe may blow off and ignite
the refrigerant oil, causing serious injury.
Caution:
•
Place a wet towel on the refrigerant service valve before heating the brazed
section to keep the temperature of the valve from exceeding 120 ˚C [248 ˚F].
•
Direct the flame away from the wiring and metal sheets inside the unit to
prevent heat damage.
Caution:
•
Do not vent R410A into the atmosphere.
•
Refrigerant pipe connection
This product needs connecting pipes for front piping and bottom post-piping
(sold separately). (Refer to [Fig.10.2.2])
Check the liquid/gas piping dimensions before connecting the refrigerant pipe.
Refer to item 9.2 Refrigerant piping system for piping dimensions.
Make sure that the refrigerant pipe is not touching other refrigerants pipes, unit
panels, or base plates.
Be sure to use non-oxidative brazing when connecting pipes.
Be careful not to burn the wiring and plate when brazing.
<A> Front pipe routing
<B> Bottom pipe routing
<C> Included with outdoor unit
A
Gas pipe (field supply required)
B
Liquid pipe (field supply required)
C
Shape
<A>
<B>
