Panasonic CS-20PM1HPK, Installation Manual

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7 English
• To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the end or
cover it with tape.
• Do not allow air, etc., to become mixed with the specified refrigerant inside the refrigeration cycle.
• The outdoor unit is charged with refrigerant.
• To prevent flare nut cracking and gas leaks, be sure to use both a spanner and torque wrench together, as
shown in the drawing, when connecting or disconnecting pipes to / from the unit.
• Refer to the table below for flare measurements.
• When connecting the flare nut, coat the flare both inside and outside with ester oil or ether oil and initially
tighten by hand 3 or 4 turns before tightening firmly.
• Refer to the table for tightening torque. Overtightening may damage the flare.
• Use the attached pipe, with the “CS-
∗∗
PM1HPK”.
• Wrap only the gas line side with the sealing pad (5). Bend the pad over the insulation for fitting (union) from
above.
• After inspecting pipe joints for gas leakage, be sure to insulate with the accessory joint insulation for fitting
(3) (4) while referring to the figure on the next page. (Fasten both ends with clamps (6)).
CAUTION
Overtightening may damage the flare and cause leaks.
Use “ Tabel 2 ” as a reference if a torque wrench is not available. Once work is complete, make sure there is
no gas leaking. As the flare nut is tightened with the wrench, the torque will suddenly increase. From that posi-
tion, tighten the nut to the angle shown on “ Tabel 2 ”.
• Make absolutely sure to execute heat insulation works on the pipe-connecting section after checking gas
leakage by thoroughly studying the following figure and using the attached heat insulating materials for
fitting (3) and (4). (Fasten both ends with the clamps (6) (attached).)
(Refer to Fig. 1)
• Wrap the sealing pad (5) (attached) only around the insulation for the joints on the gas piping side.
CAUTION
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping
may cause condensation or burns if touched.
• When brazing the refrigerant piping, only begin brazing after having carried out nitrogen substitution
(NOTE 1) or while inserting nitrogen into the refrigerant piping (NOTE 2). Once this is done, connect the
indoor unit with a flared or a flanged connection.
NOTES
1. Refer to the “Manual for Multi Installation for Buildings” for directions on how to carry out nitrogen substi-
tution. (Inquire with your dealer.)
2. Nitrogen should be set to 0.02 Mpa (0.2 kg/cm
2
) with a pressure-reducing valve if brazing while inserting
nitrogen into the piping.
Torque wrench
Flare nut
Piping union
Spanner
Coated with ester
oil or ether oil.
Insulation for fitting
(accessory) (4)
(For liquid pipes)
Clamp (6)
(4 accessory)
Insulation for fitting
(accessory) (3)
(For gas pipes)
Sealing pad (accessory) (5)
(Wrapped over union)
Gas pipe
Liquid pipe
Fig. 1
Refrigerant piping
Part to be brazed Taping
Pressure-reducing valve
hands valve
Nitrogen
Nitrogen