Lennox International Inc WING manual Outdoor Unit, Indoor, Yes

REFRIGERANT CONNECTIONS

Service valve

OUTDOOR

UNIT

Flared nuts	INDOOR
	UNIT
	Coupling

Protective hoods

Insulation

REFRIGERANT CONECTION FOR UNITS WITH COUPLINGS AND SERVICE VALVES NOTE: THE REFRIGERANT LINES GAS AND LIQUID, MUST BE INSULATED

Make the refrigerant connections between the outdoor and indoor unit, as follows:

-With the valves closed on outdoor unit, unscrew the flare nuts, removing all the protective hoods. -Unscrew the flare nuts and the coupling on indoor unit, removing the protecting hoods. -Introduce the flare nuts in the corresponding union tubes, previously isolated.

-Make the thread union of the tubes in valves and coupling using the keys, as shown in the picture.

-To do vacuum, first close the valves on outdoor unit, second connect the plug of the vacuum pump to the suction valves service port 1/4”, do vacuum to get an absolute pressure of 0.5 mm Hg. This way the vacuum will

be created in indoor unit and union pipes.

-Remove the plugs and open the valves of outdoor unit. -Verify leakage in couplings.

-Insulate pipes and service ports.

CUT THE PIPE PROPERLY			MAKE A CORRECT FLARE
Pipe cutter
YES	Bent	Unpolished	FAULTY
90°
		NO
		Bent	Damaged surface	Flawed	Irregular

AVOID FROM METALIC DUST ENTERING INTO THE PIPE

CLEAN THE BURRS

0-0.5 m.m.

Copper pipe

TIGHTENING TORQUE
Apply the tightening torque shown in the table.	Gas line
Insufficient tightening torque could cause
refrigerant leak,	Service port
excessive tightening torque will damage pipe
flare.

PIPE DIAMETER	TIGHTENING TORQUE
3/8''	31-35 Nm
1/2''	50-55 Nm
3/4''	65-70 Nm

Liquid line

Wrench

17