Panasonic U-72MF1U9 Technical Data Manual page 52

4. Installation Instructions
4-12. 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 ø1" (ø25.4 mm) 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
Refrigerant tubing (Existing tubing can be used.)
Outer dia.
1
ø1/4" (ø6.35)
ø3/8" (ø9.52)
ø1/2" (ø12.7)
ø5/8" (ø15.88)
2
4-13. Connect the Tubing
Use the supplied connector tubing. (See figure below.)
72 type (6-Ton)
3
4 3 2
1
4
5
96 type (8-Ton)
4 3 2 1
6
7
Refrigerant tube port
Use caulking, putty, or a similar material to fill any
gaps at the refrigerant tube port (
8 prevent rainwater, dust or foreign substances from
entering the unit.
* Perform this work even if the tubing is routed out
in a downward direction.
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.
Tubing size (mm)
Thickness Outer dia.
t1/32" (t0.8) ø3/4" (ø19.05)
t1/32" (t0.8) ø7/8" (ø22.22)
t1/32" (t0.8) ø1-1/8" (ø28.58)
t5/128" (t1.0) ø1-3/8" (ø34.92)
Refrigerant
Connection method
tubing
1 Suction tube Brazed connection
2 Discharge tube Brazed connection
Liquid tube Brazed connection
3
4 Balance tube Flared connection
Refrigerant
Connection method
tubing
1 Suction tube Brazed connection
2 Discharge tube Brazed connection
3 Liquid tube Brazed connection
4 Balance tube Flared connection
) in order to
Thickness
over t5/128" (t1.0)
t5/128" (t1.0)
t5/128" (t1.0)
over t3/64" (t1.1)
Use supplied
connector tube?
No
No
No
No
Use supplied
connector tube?
Yes (ø3/4" ø7/8")
Yes (ø5/8" ø3/4")
No
No
Tubing routed out forward
2 - 38
Design of 3WAY VRF SYSTEM
Base plate
Tubing
cover
Tubing routed out downward