Installation instruction
23
English Installation instruction
• After selecting the best location, start installation to Indoor/Outdoor Unit Installation Diagram.
1. Fix the unit on concrete or rigid frame firmly and horizontally by bolt nut (ø10 mm).
2. When installing at roof, please consider strong wind and earthquake.
Please fasten the installation stand firmly with bolt, screws or nails.
AB
C
D
Install the Outdoor Unit
Connecting the Piping to Indoor
Connecting the Piping to Outdoor
Evacuation of the Equipment
Outdoor Unit
For connection joint location at outside building
Please make flare after inserting flare nut (locate at joint portion of tube assembly)
onto the copper pipe. (In case of using long piping)
Connect the piping
• Align the center of piping and sufficiently tighten the flare nut with fingers.
• Further tighten the flare nut with torque wrench in specified torque as
stated in the table.
Torque
wrench
Spanner or
Wrench
Decide piping length and then cut by using pipe cutter.
Remove burrs from cut edge.
Make flare after inserting the flare nut (locate at valve)
onto the copper pipe.
Align center of piping to valve and then tighten with
torque wrench to the specified torque as stated in the
table.
Do not overtighten, overtightening may cause gas leakage.
Piping size Torque
6.35 mm (1/4") [18 N•m (1.8 kgf•m)]
9.52 mm (3/8") [42 N•m (4.3 kgf•m)]
12.7 mm (1/2") [55 N•m (5.6 kgf•m)]
15.88 mm (5/8") [65 N•m (6.6 kgf•m)]
19.05 mm (3/4") [100 N•m (10.2 kgf•m)]
WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT
AND PIPES in the following procedure.
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation.
There is no extra refrigerant in the outdoor unit for air purging.
1. Connect a charging hose with a push pin to the Low side of a charging set and the service port of the 3-way valve.
• Be sure to connect the end of the charging hose with the push pin to the service port.
2. Connect the center hose of the charging set to a vacuum pump.
3. Turn on the power switch of the vacuum pump and make sure that the needle in the gauge moves from
0 cmHg (0 MPa) to –76 cmHg (–0.1 MPa). Then evacuate the air approximately ten minutes.
Model A B C D
540 mm 160 mm 18.5 mm 330 mm
570 mm 105 mm 18.5 mm 320 mm
484 mm 102 mm 18.5 mm 260 mm
513 mm 148 mm 18.5 mm 260 mm
SU12 Series, NU12_4 Series,
KU12 Series, YU12 Series
KU18 Series, KZ18 Series,
TU18 Series, YU18 Series
NU24 Series, KU24 Series,
KZ24 Series, YU24 Series
SU18 Series
513 mm 148 mm 5.5 mm 292 mm
NU12_5 Series, NU18 Series,
SU24 Series
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