Lennox International Inc. WING - Manual (Page 19)

17
PIPE DIAMETER TIGHTENING TORQUE
TIGHTENING TORQUE
Apply the tightening torque shown in the table.
Insufficient tightening torque could cause
refrigerant leak,
excessive tightening torque will damage pipe
flare.
1/2'' 50-55 Nm
3/8''
3/4''
31-35 Nm
65-70 Nm
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.
INDOOR
UNIT
Service valve
Coupling
Flared nuts
Insulation
Protective hoods
OUTDOOR
UNIT
Pipe cutter
Bent Unpolished
CUT THE PIPE PROPERLY
AVOID FROM METALIC DUST ENTERING INTO THE PIPE
CLEAN THE BURRS
90°
YES
NO
Bent
0-0.5 m.m.
Copper pipe
FAULTY
Damaged surface Flawed Irregular
MAKE A CORRECT FLARE
Liquid line
Service port
Gas line
Wrench
REFRIGERANT CONNECTIONS