Panasonic CU-2E18NBU service manual

18.For R410A models, when connecting the piping, do not use any existing (R22) pipes and flare nuts. Using such same may cause abnormally high pressure in the refrigeration cycle (piping), and possibly result in explosion and injury. Use only R410A materials.

Thickness of copper pipes used with R410A must be more than 1/32". Never use copper pipes thinner than 1/32". It is desirable that the amount of residual oil is less than 0.0014 oz/32.8ft.

19.During installation, install the refrigerant piping properly before run the compressor. (Operation of compressor without fixing refrigeration piping and valves at opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).

20.During pump down operation, stop the compressor before remove the refrigeration piping. (Removal of refrigeration piping while compressor is operating and valves are opened condition will cause suck-in of air, abnormal high pressure in refrigeration cycle and result in explosion, injury etc.).

21.After completion of installation or service, confirm there is no leakage or refrigerant gas. It may generate toxic gas when the refrigerant contacts with fire.

22.Ventilate if there is refrigerant gas leakage during operation. It may cause toxic gas when refrigerant contacts with fire.

23.Do not insert your fingers or other objects into the unit, high speed rotating fan may cause injury.

24.Must not use other parts except original parts described in catalog and manual.

25.Using of refrigerant other than the specified type may cause product damage, burst and injury etc.

CAUTION

1.Do not install the unit at place where leakage of flammable gas may occur. In case gas leaks and accumulates at surrounding of the unit, it may cause fire.

2.Carry out drainage piping as mentioned in installation instructions. If drainage is not perfect, water may enter the room and damage the furniture.

3.Tighten the flare nut with torque wrench according to specified method. If the flare nut is over-tightened, after a long period, the flare may break and cause refrigerant gas leakage.

4. Do not touch outdoor unit air inlet and aluminium fin. It may cause injury.

5.Select an installation location which is easy for maintenance.

6.Pb free solder has a higher melting point than standard solder; typically the melting point is 50°F – 70°F (30°C – 40°C) higher. Please use a high temperature solder iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).

Pb free solder will tend to splash when heated too high (about 1100°F / 600°C).

7.Power supply connection to the air conditioner.

Power supply cord shall be UL listed or CSA approved 4 conductor with minimum AWG12 wires.

Power supply point should be in an easily accessible place for power disconnection in case of emergency. In some countries, permanent connection of this air conditioner to the power supply is prohibited.

Fix power supply connection to a circuit breaker for the permanent connection.

Use NRTL approved fuse or circuit breaker (rating refers to name plate) for the permanent connection.

8.Do not release refrigerant during piping work for installation, servicing, reinstallation and during repairing a refrigerant parts. Take care of the liquid refrigerant, it may cause frostbite.

9.Installation or servicing work: It may need two people to carry out the installation or servicing work.

10. Do not install this appliance in a laundry room or other location where water may drip from the ceiling, etc.

11. Do not sit or step on the unit, you may fall down accidentally.

12.Do not touch the sharp aluminium fins or edges of metal parts.

If you are required to handle sharp parts during installation or servicing, please wear hand glove. Sharp parts may cause injury.

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