the purpose of evaluating potential for fire or explosion hazard relative to potential ignition sources within the appliance if the piping within the area of the

appliance to be evalu ated complies with ali of the following ;

no connecting joints;

no bends with centreline bend radius less than 2,5 times the external pipe diameter;

protected from potential damage during normal operation , service or maintenance.

CAUTION

To prevent the refrigerant piping from oxidizing inside when welding, it is necessary to charge nitrogen, or oxide will chock the circulation

system.

Pressured nitrogen [4.3MPa (43bar) for R32] should be used in the airtight testing.

Tighten high/low pressure valves before charging pressured nitrogen.

Charge pressure nitrogen from the connector on the pressure valves.

The airtight testing should never use any oxygen, flammable gas or poisonous gas.

7.4 Refrigerant connections

Comply with the following indications when connecting the refrigerant pipes:

•

Make sure that the refrigerant pipes can withstand the refrigerant maximum pressure (PS= 4,3MPa).

•

Make sure there is no any dirt or water before connectiong the piping to the outdoor and indoor units.

•

Wash the pipes with high pressure nitrogen, never use refrigerant of outdoor unit.

•

Match the ends of the previously flared pipe with those of the connections on the indoor units (see part. L e G "fig. 3 - dimensional data and connections" a pagina 87).

•

Tighten the union by hand and then torque it with the aid of an adequate wrench.

To the outdoor unit

• Match the ends of the pipe previously flared with those of the taps on the outdoor unit.

• Screw the fitting by hand and then tighten it with a suitable wrench.

The protective cap is a one-time part, it can not be reused. In case it is removed, it should be replaced with a new one.

Outer diam.

Ø 6.35

Ø 9.52

Ø 15.88

CAUTION

To prevent the refrigerant piping from oxidizing inside when welding, it is necessary to charge nitrogen, or oxide will chock the circulation