10. Installation
16
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Ceiling cassette 4-way
Indoor Units
Indoor unit
• The following parts are local purchasing.
- Hanging Bolt - W 3/8 or M10
- Nut - W 3/8 or M10
- Spring Washer - M10
- Plate Washer - M10
2) For new ceilings
①
Refer to the paper pattern for ceiling opening
dimension.
• The center of the ceiling opening is indicated on the
paper pattern for installation.
The center of the unit is indicated on the label attached
to the unit and on the paper pattern for installation.
• First remove paper packaging material from the
4 corners of the paper pattern for installation , fix the
paper pattern to the unit with screws.
• Ceiling height is shown on the side of the paper pattern
for installation. Adjust the height of the unit according to
this indication.
<Ceiling work>
②
Adjust the unit to the right position for installa-
tion.
③
Assure that the unit is horizontal.
• The indoor unit is equipped with a built-in drain pump
and float switch. At each of the unit's 3 corners, verify
that it is level by using awater-level or a water-filled
vinyl tube. (Otherwise it will result in the malfunctioning
of unit and cause water to drip.)
④
Remove the washer fixing plate used for
preventing the washer from falling and tighten the
upper nut.
5) Remove the paper pattern for installation
3) For existing ceilings
①
Adjust the height and position of the unit.
②
Perform steps 3 and 4 in "5.1 For new ceilings".
10.6 Connecting pipes to the indoor unit
1) Refrigerant piping work
please refer “REFRIGERANT PIPING WORK”.
2) Piping insulation
①
Perform heat insulation work completely on both gas and
the liquid pipe. Because improper insulation will result
condensate formation over pipe.
②
Use the heat insulation material for the refrigerant piping
which has an excellent heat resistance (over 248°F).
③
Precautions in high humidity circumstance:
④
Refer to insulation work
3) Indoor unit drain piping
• Drain piping must have downward (1/50 to 1/100): be sure
not to provide up-and-down slope to prevent reverse flow.
• During drain piping connection, be careful not to exert
extra force on the drain port on the indoor unit.
• The outside diameter of the drain connection on the inddor
unit is 1 1/4".
• Make 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.
CAUTION
Piping material: Polyvinyl chloride pipe 1" and pipe fit-
tings
p
Flexible drain hose
1/50~
1/100
MAX
27 9/16"
Upward
routing
not allowed
