Panasonic CS-F24DTE5 - Page 40

Flare nut fastening torque N.m (kgf.cm)
ø6.35 mm 18 (180) ø15.88 mm 65 (660)
ø9.52 mm 42 (430) ø19.05 mm 100 (1020)
ø12.7 mm 55 (560)
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Be sure to use the drain hose provided (accessory item.)
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Drain piping must have down-slope (1/50 to 1/100): be sure
not to provide up-and-down slope to prevent reversal flow.
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During drain piping connection, be careful not to exert extra
force on the drain port at the indoor unit.
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The outside diameter of the drain connection at the indoor
unit is 20 mm.
Piping material: Polyvinyl chloride pipe VP-20 and pipe fittings
Heat insulation material: Polyethylene foam with thickness more
than 8mm (local supply).
Liquid side piping Gas side piping
ø9.52 mm ø15.88 mm
10.4.4. Refrigerant piping
Refrigerant is charged to the outdoor unit. For details, see the manual for installation work of outdoor unit.(Additional charging,
etc.)
1. Brazing for piping.
a. Execute brazing before tightening the flare nut.
b. Brazing must be executed while blowing nitrogen gas.
(This prevents generation of oxidized scale in copper pipe.)
2. When there is a lot of brazing for long piping, install a strainer at the midway of the piping.
(The strainer is locally supplied.)
3. Use clean copper pipe with inner wall surface free from mist and dust. Blow nitrogen gas or air to blow off dust in the pipe before
connection.
4. Form the piping according to its routing. Avoid bending and bending back the same piping point more than three times.
(This will result in hardening of the pipe).
5. After deforming the pipe, align centers of the union fitting of the indoor unit and the piping and tighten them firmly with wrenches.
6. Connect pipe to the service valve or ball valve which is located below the outdoor unit.
7. After completed the piping connection, be sure to check if there is gas leakage in indoor and outdoor connection.
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Confirm the red mark of the union (thin side) is always at lower direction after connecting piping.
Vacuum drying
After completing the piping connection, execute vacuum drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out by using the service ports of both the liquid and gas side valves.
CAUTION Use two wrenches and tighten with regular torque.
10.4.5. Indoor unit drain piping
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CS-F24DTE5 CU-L24DBE5 / CS-F28DTE5 CU-L28DBE5