Drain Piping Work; Refrigerant Piping Work - Panasonic CS-20KM1HPK Installation Manual

5. DRAIN PIPING WORK

〈〈 〈〈 〈〈 〈〈Rig the drain pipe as shown below and take measures against condensation.
Improperly rigged piping could lead to leaks and eventually wet furniture and
belongings.〉〉 〉〉 〉〉 〉〉
(1) Rig the drain piping.
• Keep the drain hose short and sloping downwards, as shown in the drawing,
to prevent air pockets from forming.
• Use a vinyl tube of the same size (nominal diameter: 20 mm, outer diameter:
26 mm) as the pipe connection, or larger.
• Insulate all piping inside the building.
(2) After piping work is finished, check drainage flows smoothly.
• See "INDOOR UNIT INSTALLATION" and detach the left side panel.
• Slowly add water to the left side of the drainage pan to check drainage flow.
CAUTION
Drain piping connections
Do not connect the drain piping directly to sewage pipes that smell of ammonia. The ammonia in the sew-
age might enter the indoor unit through the drain pipes and corrode the heat exchanger.

6. REFRIGERANT PIPING WORK

〈 〈 〈 〈 For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.〉 〉 〉 〉
〈 〈 〈 〈 Be sure to thermally insulate both the gas pipes and fluid pipes. Water leakage may result if the pipes
are not insulated. (Only use insulation resistant to at least 120 °C.)
Furthermore, if the temperature/humidity in the refrigerant piping are expected to exceed 30 °C or
80% RH, the thermal insulation of the refrigerant pipes should be strengthened (to be a thickness of
20 mm or more). There may be some condensation on the surface of the insulation material.〉 〉 〉 〉
〈 〈 〈 〈 Before rigging tubes, check which type of refrigerant is used. Proper operation is not possible if the
types of refrigerant are not the same.〉 〉 〉 〉
6-1 CAUTION
• Use a pipe cutter and flare suitable for the type of refrigerant.
• Apply ether oil or ester oil around the flare portions before connecting.
• To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the end or
cover it with tape.
• 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 below, 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 refrigerating machine oil and ini-
tially tighten by hand 3 or 4 turns before tightening firmly.
• Refer to the table below for tightening torque. Overtightening may damage the flare.
• Check the pipe connector for gas leaks, then insulate it as shown in the drawing.
CAUTION
Overtightening may damage the flare and cause leaks.
English
Coated with ester
oil or ether oil.
Torque wrench
Flare nut
Drain hose
Drain hose
Spanner
Piping union
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