Electrical Wiring; General Precautions On Wiring - Panasonic U-8ME2R8 Installation Instructions Manual

Do not apply an adjustable
wrench to the hexagonal part.
Use two adjustable wrenches when removing or installing the
balance tube flare nut.
In particular, do not apply an adjustable wrench to the
hexagonal part at the top of the valve.
If force is applied to this part, gas leakage will occur.
Apply an adjustable wrench to settle the fixing tool as shown in
the figure. If not used, the valve fixing tool will get distorted.
Use two adjustable wrenches, as shown in the figure,
when removing the liquid tube valve flare nut.
1. Do not apply a wrench to the valve cap when removing or
installing the flare nuts. Doing so may damage the valve.
2. If the valve cap is left off for a long period of time, refrigerant
leakage will occur. Therefore, do not leave the valve cap off.
3. Applying refrigerant oil to the flare surface can be effective in
preventing gas leakage, however be sure to use a refrigerant
oil which is suitable for the refrigerant that is used in the
system.
This unit utilizes R410A refrigerant, and the refrigerant oil is
ether oil (synthetic oil). However, hub oil (synthetic oil) can
also be used.
● Precautions for brazing
Be sure to replace the air inside the tube with nitrogen to
prevent oxide film from forming during the brazing process.
Be sure to use a damp cloth or other means to cool the valve
unit during brazing.
Work method
Work method
Field-supply tube
Brazing locations
Taping
CAUTION
1. Be sure to use nitrogen
Oxygen, CO , and CFC must not be used.
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2. Use a pressure-reducing valve on the nitrogen tank.
3. Do not use agents intended to prevent the formation of oxide
film. They will adversely affect the refrigeration oil, and may
cause equipment failure.
4. The balance tube is not used if only 1 outdoor unit is
installed. Use the unit in the same conditions as when it was
shipped from the factory.
Valve fixing tool
Remote valve
Pressure-reducing Pressure-reducing
valve (regulator)
valve (regulator)

4. ELECTRICAL WIRING

4-1. General Precautions on Wiring

(1) Before wiring, confirm the rated voltage of the unit as
shown on its nameplate, then carry out the wiring closely
following the wiring diagram.
(2) Provide a power outlet to be used exclusively for each
unit, and a power supply disconnect, circuit breaker and
earth leakage breaker for overcurrent protection should be
provided in the exclusive line.
(3) To prevent possible hazards from insulation failure, the unit
must be grounded.
(4) Each wiring connection must be done in accordance with
the wiring system diagram. Wrong wiring may cause the
unit to misoperate or become damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be very
dangerous. The manufacturer will accept no responsibility
for any damage or misoperation that occurs as a result of
such unauthorized changes.
(7) Regulations on wire diameters differ from locality to
locality. For field wiring rules, please refer to your LOCAL
ELECTRICAL CODES before beginning. You must
ensure that installation complies with all relevant rules and
regulations.
(8) To prevent malfunction of the air conditioner caused by
electrical noise, care must be taken when wiring as follows:
● The remote control wiring and the inter-unit control
wiring should be wired apart from the inter-unit power
wiring.
● Use shielded wires for inter-unit control wiring between
units and ground the shield on both sides.
(9) Use a waterproof conduit for outdoor unit wiring to avoid
damaging the wire and to prevent accumulation of liquid
inside the unit.
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