10
■
When screwing in the indoor unit
•
Remove the front grill.
(Refer to Fig. 7)
•
Secure the indoor unit to the installation panel (1) with the securing
screws (6).
(Refer to Fig. 11)
5. REFRIGERANT PIPING WORK
〈
For refrigerant piping of outdoor units, see the installation manual attached to the outdoor unit.
〉
〈
Execute heat insulation work completely on both sides of the gas piping and the liquid piping.
Otherwise, a water leakage can result sometimes.
〉
(
When using a heat pump, the temperature of the gas piping can reach up to approximately 250°F, so use
insulation which is sufficiently resistant.)
〈
Also, in cases where the temperature and humidity of the refrigerant piping sections might exceed
86°F or RH80 %, reinforce the refrigerant insulation. (13/16” or thicker) Condensation may form on the
surface of the insulating material.
〉
〈
Before refrigerant piping work, check which type of refrigerant is used. Proper operation is not pos-
sible if the types of refrigerant are not the same.
〉
NOTE
• Use a pipe cutter and flare suitable for the type of refrigerant.
• To prevent dust, moisture or other foreign matter from infiltrating the tube, either pinch the end
or cover it with tape.
• Do not allow anything other than the designated refrigerant to get mixed into the refrigerant
circuit, such as air, etc.
• If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly right away.
•
The outdoor unit is charged with refrigerant.
•
Use copper alloy seamless pipes.
•
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 Fig. 12)
•
Refer to “Table 1” for the dimensions of flare.
•
When connecting the flare nut, coat the flare section (both inside and
outside) with ester oil or ether oil, rotate three or four times first, then
screw in.
(Refer to Fig. 13)
CAUTION
•
Over-tightening may cause the flare nuts to crack or the refrigerant
to leak.
•
Use the flare nut included with the unit.
