Prepare The Tubing; Connect The Tubing - Panasonic U-8ME1E8 Installation Instructions Manual

3-4. Prepare the Tubing

● Material: Use C1220 phosphorous deoxidized copper
as described in JIS H3300, "Copper and Copper Alloy
Seamless Pipes and Tubes." (For tubes that are ø22.22 or
larger, use 1/2H material or H material. For all others use O
material.)
● Tubing size
Use the tubing size indicated in the table below.
● When cutting the tubing, use a tube cutter, and be sure to
remove any burrs.
(The same applies to distribution tubing (optional).)
● When bending the tubes, bend each tube using a radius
that is at least 4 times the outer diameter of the tube. When
bending, use sufficient care to avoid crushing or damaging
the tube.
● For flaring, use a flare tool, and be sure that flaring is
performed correctly.
CAUTION
Use sufficient caution during preparation of the tubing.
Seal the tube ends by means of caps or taping to prevent
dust, moisture, or other foreign substances from entering
the tubes.
Refrigerant tubing
Tubing size (mm)
Outer dia. Thickness
ø6.35 t0.8
ø9.52 t0.8
ø12.7 t0.8
ø15.88 t1.0
ø19.05 t1.2

3-5. Connect the Tubing

● When operating the refrigerant tube installation in the
field, do not apply the flame of welding to the surrounding
sheet-metal parts. If necessary, use a wet rag to prevent
overheating of the heat exchanger.
● If you have difficulty installing the refrigerant tube, you may
remove the fixing bracket.
Since this bracket is only used for transportation, it is not
necessary to reinstall in its original position. If not used for
transportation, dispose of the bracket in a proper way.
Outer dia. Thickness
ø22.22 t1.0
ø25.4 t1.0
ø28.58 t1.0
ø31.75 t1.1
ø38.1 over t1.35
ø41.28 over t1.45
Removable
● Except for the 16hp model, do not use the supplied
connector tubing. (See figure below.)
Model : 8hp, 10hp, 12hp, 14hp, 18hp, 20hp (Except 16hp)
3 2 1
1
2 Liquid tubing Flare connection
3 Balance tube Flare connection
Model : 16hp
3 2 1
1
2 Liquid tubing Flare connection
3 Balance tube Flare connection
Refrigerant tube port
● Use caulking, putty, or a similar material to fill any gaps at
the refrigerant tube port (
dust or foreign substances from entering the unit.
* Perform this work even if the tubing is routed out in a
downward direction.
Tubing routed out
through the front side
Tubing routed out
through the bottom
24
Refrigerant Connection
tubing method
Gas tubing Brazing
Refrigerant Connection
tubing method
Gas tubing Brazing
) in order to prevent rainwater,
Tubing
cover
Bottom
plate
Supplied
parts used?
No
No
No
Supplied
parts used?
yes
(ø25.4 ø28.58)
No
No