Panasonic U-8MF1E8 Installation Instructions Manual page 15

3WAY_ECO-i_inst_eng_Book.indb 23
3-3. Routing the Tubing
● The tubing can be routed out either from the front or from the
bottom. (Fig. 3-5)
● The connecting valve is contained inside the unit. Therefore,
remove the front panel. (Fig. 3-5)
(1) If the tubing is routed out from the front, use cutting pliers or
a similar tool to cut out the tubing outlet slit (part indicated
by ) from the tubing cover. (Figs. 3-5 and 3-6)
Front
Remove
Bottom 11 panel
screws from
front panel
Tubing cover
Remove 2 screws
Use cutting pliers or similar
tool to cut cover out
(2) If the tubing is routed out from the bottom, remove the slit
part ( ).
● Use a drill bit approximately 5 mm dia. to create holes at the
4 slit hole indentations (openings).
● Punch out the slit part (
).
● Be careful not to damage the base plate.
Indentation
(4 locations)
Slit hole
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 ø25.4 or larger, use 1/2H material or H
material. For all others use O material.)
● Tubing size
Use the tubing size indicated in the following table.
Refrigerant tubing (Existing tubing can be used.)
Tubing size (mm)
Outer dia. Thickness Outer dia. Thickness
ø6.35 t0.8 ø25.4
ø9.52 t0.8 ø28.58
ø12.7 t0.8 ø31.8
ø15.88 t1.0 ø38.1
ø19.05 t1.0 ø41.28
ø22.22 t1.15
● 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.
3-5. Connect the Tubing
● Except for 8HP type, use the supplied connector tubing.
(See figure below.)
8HP type
Fig. 3-5
Connection
Refrigerant tubing
method
1
Suction tube Brazed connection
2
Discharge tube Brazed connection
3
Liquid tube Brazed connection
4
Balance tube Flared connection
10HP type
Fig. 3-6
Connection
Refrigerant tubing
method
1
Suction tube Brazed connection Yes (ø19.05→ø22.22)
2
Discharge tube Brazed connection Yes (ø15.88→ø19.05)
3
Liquid tube Brazed connection
4
Balance tube Flared connection
t1.0
t1.0
t1.1
t1.15
t1.2
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SUPPLEMENT
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12HP type
Refrigerant tubing
1
Suction tube
2
Discharge tube
3
Liquid tube
4
Balance tube
14HP type
Use supplied
connector tube?
No Refrigerant tubing
No
1
Suction tube
No
2
Discharge tube
No
3
Liquid tube
4
Balance tube
16HP type
Use supplied
connector tube?
Refrigerant tubing
1
Suction tube
No
2
Discharge tube
No
3
Liquid tube
4
Balance tube
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.
Connection Use supplied
method connector tube?
Tubing routed out forward
Brazed connection Yes (ø19.05→ø25.4)
Brazed connection Yes (ø15.88→ø19.05)
Brazed connection Yes (ø9.52→ø12.7)
Flared connection No
Flare nut
● Tighten each cap as specified below.
Tightening torque for each cap
Service port cap
(width 15 mm)
Valve cap
(width 22 mm)
Flare nut
Connection Use supplied
method connector tube? (valve dia. ø9.52)
Brazed connection No
● Precautions for brazing
Brazed connection Yes (ø19.05→ø22.22)
Be sure to replace the air inside the tube with nitrogen to
prevent oxide film from forming during the brazing process.
Brazed connection No
Be sure to use a damp cloth or other means to cool the valve
Flared connection No
unit during brazing.
Work method
Field-supply tube
Brazing locations
CAUTION
1. Be sure to use nitrogen. (Oxygen, CO
Connection Use supplied
be used.)
method connector tube?
2. Use a pressure-reducing valve on the nitrogen tank.
Brazed connection Yes (ø25.4→ø28.58)
3. Do not use agents intended to prevent the formation of oxide
Brazed connection Yes (ø19.05→ø22.22)
film. They will adversely affect the refrigeration oil, and may
cause equipment failure.
Brazed connection No
4. The balance tube is not used if only 1 outdoor unit is
Flared connection No
installed.
Use the unit in the same conditions as when it was shipped
from the factory.
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) in order to prevent rainwater,
Base plate
Tubing
cover
Tubing routed out downward
Valve cap
Service port cap
7 – 12 N · m (70 – 120 kgf · cm)
20 – 25 N · m (200 – 250 kgf · cm)
34 – 42 N · m (340 – 420 kgf · cm)
Pressure-
reducing
Remote valve
valve
(regulator)
Taping
, and CFC must not
2