4
English
3
Adjust the unit to the right position for installation.
(See “Preparations before installation” on page 3.)
4
Check if the unit is horizontally levelled.
- Do not install the unit tilted. The indoor unit is equipped with a
built-in drain pump and float switch. (If the unit is tilted against the
direction of the condensate flow (the drain piping side is raised),
the float switch may malfunction and cause water to drip.)
- Check if the unit is levelled at all four corners with a water level or
a water-filled vinyl tube as shown in figure 11.
1
Water level
2
Vinyl tube
5
Remove the paper pattern for installation. (For new ceilings only.)
Refrigerant piping work
For refrigerant piping of outdoor unit, refer to the installation manual
supplied with the outdoor unit.
Execute thermal insulation work completely on both sides of the gas
piping and liquid piping. Otherwise, this can sometimes result in water
leakage.
Before rigging pipes, check which type of refrigerant is used.
Installation shall be done by a licensed refrigeration
technician, the choice of materials and installation shall
comply with the applicable national and international codes.
Use a pipe cutter and flare suitable for R410A refrigerant.
To prevent dust, moisture or other foreign matter from infiltrating the
pipe, either pinch the end, or cover it with tape.
The outdoor unit is charged with refrigerant.
To prevent water leakage, execute thermal insulation work
completely on both sides of the gas and liquid piping. When using a
heat pump, the temperature of the gas piping can reach up to
approximately 250°F (120°C), use insulation which is sufficiently
heat resistant.
Be sure to use both a spanner and torque wrench together when
connecting or disconnecting pipes to/from the unit.
1
2
4
3
1
Torque wrench
2
Spanner
3
Piping union
4
Flare nut
Do not mix anything other than the specified refrigerant, such as air,
etc. inside the refrigerant circuit.
Only use annealed material for flare connections.
Refer to Table 1 for the dimensions of flare nut spaces and the
appropriate tightening torque. (Overtightening may damage the
flare and cause leaks.)
Table 1
Piping size
[in. (mm)]
Tightening torque
[lbf·ft. (N·m)]
Flare dimensions A
[in. (mm)]
Flare
[in. (mm)]
f
1/4”
(6.4)
10.4-12.7
(15.7±1.5)
0.342-0.358
(8.9±0.2)
R0.016-0.031
(0.4-0.8)
f
1/2”
(12.7)
36.5-44.5
(54.9±5.4)
0.638-0.654
(16.4±0.2)
• Refer to
Table 1
to determine the proper tightening torque.
When connecting the flare nut, coat the flare inner surface with
ether oil or ester oil and initially tighten 3 or 4 turns by hand before
tightening firmly.
If the refrigerant gas leaks during the work, ventilate the area. A
toxic gas is emitted by the refrigerant gas being exposed to a fire.
Make sure there is no refrigerant gas leak. A toxic gas may be
released by the refrigerant gas leaking indoor and being exposed to
flames from an area heater, cooking stove, etc.
Finally, insulate as shown in the figure below (use the supplied
accessory parts).
4 5
5
1 2
3
1
Liquid pipe
2
Gas pipe
3
Insulation for fitting for liquid
pipe
4
Insulation for fitting for gas
pipe
5
Clamps
(use 2 clamps per insulation)
Piping insulation procedure
Gas piping
Liquid piping
A
B
D
C
7
1
2
3
4 5
6
6
A
B
C
1
2
3
4 5
6
6
D
7
1
Piping insulation material (field supply)
2
Flare nut connection
3
Insulation for fitting (supplied with the unit)
4
Piping insulation material (attached to the unit)
5
Unit body
6
Clamp (field supply)
7
Medium 1 sealing pad for gas piping (supplied with the unit)
Medium 2 sealing pad for liquid piping (supplied with the unit)
A
Turn seams up
B
Attach to base
C
Tighten the part other than the piping insulation material
D
Wrap over from the base of the unit to the top of the flare nut
connection
For field insulation, be sure to insulate field piping all the
way into the pipe connections inside the unit.
Exposed piping may cause condensation or may cause
burns when touched.
Make sure that no oil remains on plastic parts of the
decoration panel (optional accessory).
Oil may cause degradation and damage to plastic parts.
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