Table of Contents
Advertisement
SMMS Compact 4-way Cassette
Tightening connection
CAUTION
Do not apply excessive torque. Otherwise, the nut may
crack depending on the conditions.
Outer dia. of copper pipe
Tightening torque
6.4 mm
14 - 18 (1.4 to 1.8 kgf•m)
9.5 mm
33 - 42 (3.3 to 4.2 kgf•m)
12.7 mm
50 - 62 (5.0 to 6.2 kgf•m)
▼ Tightening torque of flare pipe connections
Pressure of R410A is higher than that of R22.
(Approx. 1.6 times) Use 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.
Align the centres of the connecting pipes and tighten
the flare nut as far as possible with your fingers. Then
tighten the nut with a spanner and torque wrench as
shown in the figure.
Work using double spanner
REQUIREMENT
Tightening with an excessive torque may crack the nut
depending on installation conditions.
Tighten the nut within the specified tightening torque.
Piping with outdoor unit
Shape of valve differs according to the outdoor unit.
For details of installation, refer to the Installation
Manual of the outdoor unit.
21-EN
Installation Manual
Leak check test, evacuation
and other procedure
For leak check test, evacuation, addition of refrigerant,
and gas leak check, refer to the Installation Manual
attached to the outdoor unit.
REQUIREMENT
Unit: N•m
Do not supply power to the indoor unit until the leak
check test and evacuation are completed. (If the indoor
unit is powered on, the pulse motor valve is fully closed,
which extends the time for vacuuming.)
Open the valve fully
Open the valve of the outdoor unit fully.
For details, refer to the Installation Manual attached to
the outdoor unit.
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.
Apply the attached 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 may causes water leak.)
• Wrap heat insulator with its slits facing up (ceiling
side).
Wrap the pipe with the attached heat insulator
without any gap between the indoor unit.
The seam must be faced upward
Indoor unit
(ceiling side).
Flare nut
Heat insulation
Union
Banding band
pipe
(locally
(Accessory)
procured)
SMMS Compact 4-way Cassette
– 11 –
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
• If incorrect / incomplete wiring is carried out, it will
cause an electrical fire or smoke.
• Install an earth leakage breaker that is not tripped by
shock waves.
If an earth leakage breaker is not installed, an electric
shock may be caused.
• Use the cord clamps attached to the product.
• Do not damage or scratch the conductive core and
inner insulator of power and inter-connecting wires
when peeling them.
• Use the power cord and Inter-connecting wire of
specified thickness, type, and protective devices
required.
• Do not connect 220 V – 240 V power to the terminal
blocks (
,
,
U
U
A
1
2
the system will fail.)
• Do not damage or scratch the conductive core and
inner insulator of power and inter-connecting wires
when 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.
REQUIREMENT
• For power supply wiring, strictly conform to the Local
Regulation in each country.
• For wiring of power supply of the outdoor units, follow
the Installation Manual of each outdoor unit.
• 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.
Heat insulator
• After connecting wires to the terminal blocks, provide
of the pipe
a trap and fix wires with the cord clamp.
• Run the refrigerant piping line and control wiring line in
the same line.
• Do not turn on the power of the indoor unit until
vacuuming of the refrigerant pipes completes.
Power supply wire and
communication wires
specifications
Power supply wire and communication wires are
procured locally.
For the power supply specifications, follow to the table
below. If capacity is little, it is dangerous because
overheat or burnout may be caused.
For specifications of the power capacity of the outdoor
unit and the power supply wires, refer to the Installation
Manual attached to the outdoor unit.
Indoor unit power supply
• For the power supply of the indoor unit, prepare the
exclusive power supply separated from that of the
outdoor unit.
• Arrange the power supply, circuit breaker, and main
switch of the indoor unit connected to the same
outdoor unit so that they are commonly used.
• Power supply wire specification: Cable 3-core 2.5
mm², in conformity with Design 60245 IEC 57.
,
) for control wiring. (Otherwise,
B
Installation Manual
22-EN
Advertisement
Table of Contents
