6. Place flaring tool onto the form.
7. Turn the handle of the flaring tool
clockwise until the pipe is fully flared.
8. Remove the flaring tool and flare form,
then inspect the end of the pipe for
cracks and even flaring.
Step 4: Connect pipes
When connecting refrigerant pipes, be careful
not to use excessive torque or to deform the
piping in any way. You should first connect the
low-pressure pipe, then the high-pressure pipe.
MINIMUM BEND RADIUS
When bending connective refrigerant piping,
the minimum bending radius is 4 in. (10cm).
≥4 in.(10cm)
Radius
TORQUE REQUIREMENTS
Outer Diameter of Pipe
Tightening Torque
Add. Tightening Torque
Ø 0.25 in. (Ø 6.35mm)
11 lb•ft (1,500 N•cm)
11.8 lb•ft (1,600 N•cm)
Ø 0.375 in. (Ø 9.52mm)
18.4 lb•ft (2,500 N•cm)
19.18 lb•ft (2,600 N•cm)
Ø 0.5 in. (Ø 12.7mm)
25.8 lb•ft (3,500 N•cm)
26.55 lb•ft (3,600 N•cm)
Ø 0.63 in. (Ø 16mm)
33.19 lb•ft (4,500 N•cm)
34.67 lb•ft (4,700 N•cm)
DO NOT USE EXCESSIVE TORQUE
Excessive force can break the nut or damage the refrigerant piping. You must not exceed
torque requirements shown in the table above.
Instructions for Connecting Piping
to Indoor Unit
1. Align the center of the two pipes that you will
connect. See Fig. 5.7.
Indoor unit tubing
Flare nut
Pipe
2. Tighten the flare nut as tightly as possible
by hand.
3. Using a wrench, grip the nut on the unit
tubing.
4. While firmly gripping the nut on the unit
tubing, use a torque wrench to tighten the
flare nut according to the torque values in the
Torque Requirements table below. Loosen
the flaring nut slightly, then tighten again.
Fig. 5.6
Fig. 5.7
Fig. 5.8
Page 24
Refrigerant Piping
Connection
See. Fig. 5.6.
