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39
Refrigerant Piping Connections
Due to our policy of continuous product innovation, some specifications may change without notification.
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REFRIGERANT PIPING CONNECTIONS
Table 17: Torque Wrench Tightening.
Pipe Size (in. OD) Outside Diameter (mm) Torque (lbs-ft)
1/4 6.35 13.0 - 18.0
3/8 9.52 24.6 - 30.4
1/2 12.7 39.8 - 47.7
5/8 15.88 45.4 - 59.3
3/4 19.05 71.5 - 87.5
Connecting the Indoor Unit Refrigerant Piping
1. Ensure there is enough working space between the indoor unit and the installation plate by
using the piping holder as a space holder.
2. Remove the flare nuts attached to the indoor unit piping. To remove, hold onto the piping
with an adjustable wrench, and then loosen the flare nut with a torque wrench.
3. Thread the flare nuts onto the field-supplied piping.
4. Flare the end of the piping following industry best practices, and the information in the
“General Refrigerant Piping System” section.
5. Place a couple of drops of PVE refrigerant oil on outside of the flare before assembling.
Do not add any contaminants.
6. Align the center of the refrigerant field piping to the corresponding indoor unit piping.
7. Connect the refrigerant field piping to the indoor unit piping. First, hold onto the piping with
an adjustable wrench. Tighten the flare nut initially by hand, and then finishing tightening
using a torque wrench. Follow torque guidelines in the table.
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Figure 44: Releasing the Piping Holder.
Figure 45: Using the Piping Holder to Prop
the Indoor Unit Away from the Wall.
Figure 46: Connecting the Refrigerant Field Piping to the
Indoor Unit Piping.
Indoor Unit Connections
See the Insulation pages at the end of this section for information on insulating the refrigerant piping and refrigerant piping connections.
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