Multizone Wall Mounted Air Handler Installation Manual

Instructions for Connecting Piping to
Indoor Unit
1. Align the center of the two pipes that you will
connect. See Fig. 5.7.
2. Tighten the are nut as tightly as possible by
hand.
3. Using a spanner, grip the nut on the unit
tubing.
4. While rmly gripping the nut on the unit
tubing, use a torque wrench to tighten the
are nut according to the torque values in the
Torque Requirements table below. Loosen
the aring nut slightly, then tighten again.
Note: Use of an approved refrigerant sealant is
recommended for all are joint connections.
Refrigerant Piping
Connection
 Page 22 
Revised 5/14/2020
6. Place aring tool onto the form.
7. Turn the handle of the aring tool clockwise until
the pipe is fully ared.
8. Remove the aring tool and are form, then
inspect the end of the pipe for cracks and even
aring.
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 rst connect the low-pressure
pipe, then the high-pressure pipe.
MINIMUM BEND RADIUS
When bending connective refrigerant piping,
the minimum bending radius is 4in. See
Fig.5.6.
≥4inRadius
Fig 5.6
Fig 5.8
Indoor unit tubing Flare nutPipe
Fig 5.7
Torque Requirements
Outer Diameter of Pipe (inch) Tightening Torque (ft/lb) Add. Tightening Torque (ft/lb)
1/4" 11 ft/ lb 12 ft/ lb
3/8" 18 ft/ lb 20 ft/ lb
1/2" 25 ft/ lb 26 ft/ lb
5/8" 33 ft/ lb 35 ft/ lb
Excessive force can break the nut or damage the refrigerant piping. You must not exceed torque
requirements shown in the table above.
DO NOT USE EXCESSIVE TORQUE