– 38 –
• Use the tightening torque levels as listed in the
following table.
• Tightening torque of flare pipe connections.
Pressure of R410A is higher than that of R22.
(Approx. 1.6 times) Therefore, using a torque
wrench, tighten the flare pipe connecting sections
which connect the indoor and outdoor units of the
specified tightening torque.
Incorrect connections may cause not only a gas leak,
but also a trouble of the refrigeration cycle.
CAUTION
Tightening with an excessive torque may crack the nut
depending on installation conditions.
Evacuation
Perform vacuuming from the charge port of valve of the
outdoor unit by using a vacuum pump.
For details, follow to the Installation Manual attached to
the outdoor unit.
• Do not use the refrigerant sealed in the outdoor unit
for evacuation.
REQUIREMENT
For the tools such as charge hose, use those
manufactured exclusively for R410A.
Refrigerant amount to be added
For addition of the refrigerant, add refrigerant “R410A”
referring to the attached Installation Manual of outdoor
unit.
Use a scale to charge the refrigerant of specified
amount.
REQUIREMENT
• Charging an excessive or too little amount of
refrigerant causes a trouble of the compressor.
Charge the refrigerant of specified amount.
• A personnel who charged the refrigerant should write
down the pipe length and the added refrigerant
amount in the F-GAS label of the outdoor unit. It is
necessary to fix the compressor and refrigeration
cycle malfunction.
Open the valve fully
Open the valve of the outdoor unit fully. A 4 mm-
hexagonal wrench is required for opening the valve.
For details, refer to the Installation Manual attached to
the outdoor unit.
Gas leak check
Check with a leak detector or soap water whether gas
leaks or not, from the pipe connecting section or cap of
the valve.
REQUIREMENT
Use a leak detector manufactured exclusively for HFC
refrigerant (R410A, R134a).
Heat insulation process
Apply heat insulation for the pipes separately at liquid
side and gas side.
• For the heat insulation to the pipes at gas side, use
the material with heat-resisting temperature 120 °C
or higher.
• To use the attached heat insulation pipe, apply the
heat insulation to the pipe connecting section of the
indoor unit securely without gap.
REQUIREMENT
• Apply the heat insulation to the pipe connecting
section of the indoor unit securely up to the root
without exposure of the pipe. (The pipe exposed to the
outside causes water leak.)
• Wrap heat insulator with its slits facing up (ceiling
side).
Outer dia. of connecting
pipe (mm)
Tightening torque (N•m)
6.4
14 to 18 (1.4 to 1.8 kgf•m)
9.5
34 to 42 (3.4 to 4.2 kgf•m)
12.7
49 to 61 (4.9 to 6.1 kgf•m)
15.9
63 to 77 (6.3 to 7.7 kgf•m)
Indoor unit
Union
Heat insulation
pipe
(Accessory)
Flare nut
Heat insulator
of the pipe
Wrap the pipe with the attached heat insulator
without any gap between the indoor unit.
The seam must be faced upward
(ceiling side).
Banding band
(locally
procured)
7
Electrical connection
WARNING
•
Use the specified wires for wiring connect the terminals. Securely fix them to prevent external forces applied
to the terminals from affecting the terminals.
Incomplete connection or fixation may cause a fire or other trouble.
•
Connect earth wire. (grounding work)
Incomplete grounding cause an electric shock.
Do not connect earth wires to gas pipes, water pipes, lightning conductor or telephone earth wires.
•
Appliance shall be installed in accordance with national wiring regulations.
Capacity shortage of power circuit or incomplete installation may cause an electric shock or a fire.
CAUTION
• For power supply specifications, follow the Installation Manual of outdoor unit.
• Do not connect 220 – 240 V power to the terminal blocks (
,
) for control wiring.
Otherwise, the system will fail.
• Do not damage or scratch the conductive core and inner insulator of power and system interconnection wires during
peeling them.
• Perform the electric wiring so that it does not come to contact with the high-temperature part of the pipe.
The coating may melt resulting in an accident.
• Do not turn on the power of the indoor unit until vacuuming of the refrigerant pipes completes.
System interconnection wires specifications
*Number of wire x wire size
Remote controller wiring
CAUTION
The remote controller wire and system interconnection wires cannot be parallel to contact each other and cannot be
stored in the same conduits. If doing so, a trouble may be caused on the control system due to noise or other factor.
System
interconnection
wires*
4 x 1.5 mm
2
or more
(H07 RN-F or 60245 IEC 66)
Up to
70 m
Remote controller wiring, remote controller inter-unit
wiring
Wire size: 2 × 0.5 to 2.0 mm
2
Total wire length of remote controller wiring and remote
controller inter-unit wiring = L + L1 + L2 + … Ln
In case of wired type only
Up to 500 m
In case of wireless type
included
Up to 400 m
Total wire length of remote controller inter-unit wiring = L1 + L2 + … Ln
Up to 200 m
A
B
L1
L
L2
Ln
Indoor unit
Remote controller inter-unit wiring
Indoor unit
Indoor unit
Indoor unit
Remote
controller
(Max. 8 units)
Remote
controller
wiring
75-EN
76-EN
+001114119401_01EN.book Page 38 Wednesday, October 31, 2012 4:56 PM
