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41
Refrigerant Piping Connections
Due to our policy of continuous product innovation, some specifications may change without notification.
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REFRIGERANT PIPING CONNECTIONS
Accessing and Positioning the Indoor Unit Piping / Connections (HEV2, HFV3, and HXV2), continued.
Using a Conduit for IDU Wiring / Cable Installation
Use a liquidtight 3/4 inch elbow connector for exible conduit.
1. Prop indoor unit away from wall bracket.
2. Guide communication / connection (power) cable insulation into the conduit.
• Check local, state, and federal codes when choosing a conduit size.
• For systems with wiring greater than 130 feet, see the “Communication / Connection (Power) Cable Specifications
from Outdoor Unit to Indoor Unit” in the Electrical System Installation section for information.
3. Attach conduit using the liquidtight 3/4 inch elbow connector.
4. Reassemble the indoor unit properly onto the wall bracket.
5. If conduit is not used, see pages in this section for refrigerant piping, condensate drain, power wiring / communica-
tion cable bundling information.
6. To protect the piping, condensate drain, and conduit from the elements, add a lineset cover from the indoor access
hole to the outdoor unit.
Indoor Unit Piping Flare Nut Field-
Installed
Piping
Pipe Size (in. O.D.) Outside Diameter (mm) Torque (ft-lbs.)
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
Table 20: Torque Wrench Tightening.
Figure 52: Piping Installation When Piping is on the Right Side.
Piping Installation When Piping is on the Right Side (HEV2,
HFV3, and HXV2)
See the Electrical System Installation section for information on how to connect
the communication / connection (power) wiring from the outdoor unit.
1. Align the center of the refrigerant piping and corresponding connection
as shown.
2. Place a couple of drops of refrigerant oil on outside of the flare before
assembling. Do not add any contaminants. Tighten the flare nut
initially by hand.
3. Finish tightening the flare nut with a torque wrench until the wrench
clicks. Follow torque guidelines in the table below.
When tightening the are nut with a torque wrench, ensure the direction for
tightening follows the arrow on the wrench.
4. Bundle the refrigerant piping, drain hose, and communication / con-
nection (power) cable together. Ensure that the drain hose is located
at the bottom of the bundle.
• If using a conduit for the power wiring / communications cable, see
below.
Positioning the drain hose at the top of the bundle can cause condensate to
overow from the drain pan in the inside of the indoor unit.
Figure 53: Indoor Unit Connection.
Figure 54: Liquidtight 3/4 Inch Elbow Connector
Attached to Flexible Conduit.
Indoor Unit Connections
Right Side Piping
Piping
Connection
Cable
Tape
Drain Hose
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