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Super Digital Inverter
4
INSTALLATION CONDITIONS
Before installation
Be sure to prepare to the following items before installation.
Length of refrigerant pipe
Length of refrigerant pipe
connected to indoor/
outdoor unit
3 to 30 m
*31 to 75 m
*
Caution during addition of refrigerant
When the total length of refrigerant piping exceeds 30 m,
add 40 g/m of refrigerant up to a maximum total length of
piping at 75 m. (Max. amount of additional refrigerant is
1,800 g.)
Charge the refrigerant accurately. Overcharging may
cause serious trouble with the compressor.
•
Do not connect a refrigerant pipe that is shorter than 3 m.
This may cause a malfunction of the compressor or other
devices.
Airtight test
1. Before starting an airtight test, further tighten the spindle
valves on the gas and liquid sides.
2. Pressurize the pipe with nitrogen gas charged from the
service port to the design pressure (4.15 MPa) to
conduct an airtight test.
3. After the airtight test is completed, evacuate the nitrogen
gas.
Air purge
•
To purge air, use a vacuum pump.
•
Do not use refrigerant charged in the outdoor unit to
purge air. (The air purge refrigerant is not contained in
the outdoor unit.)
Electrical wiring
•
Be sure to fix the power wires and indoor/outdoor
connecting wires with clamps so that they do not come
into contact with the cabinet, etc.
Item
Addition of refrigerant is
unnecessary at the local site.
<Addition of refrigerant>
Add 40 g of refrigerant for
every 1 m of piping that
exceeds 30 m.
12
Earthing
•
Proper earthing can prevent charging of electricity on the
outdoor unit surface due to the presence of a high
frequency in the frequency converter (inverter) of the
outdoor unit, as well as prevent electric shock. If the
outdoor unit is not properly earthed, you may be exposed
to an electric shock.
•
Be sure to connect the earth wire. (grounding work)
Incomplete earthing can cause an electric shock.
Do not connect earth wires to gas pipes, water pipes,
lightning rods or earth wires for telephone wires.
Test Run
Turn on the leakage breaker at least 12 hours before starting
a test run to protect the compressor during startup.
12-EN
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