INSTALLATION INSTRUCTIONS

C. ROUTING AND SUSPENDING REFRIGERANT LINES

Run refrigerant lines as straight and direct as possible, avoiding unnecessary bends and turns. Always insulate the entire suction line. Both lines should be insulated when routed through an attic or when routed through an underground raceway.

When routing refrigerant lines through a foundation or wall, do not allow refrigerant lines to come in direct contact with the building structure. Make openings large

3-phase R-22 Split System Heat Pump

enough so that lines can be wrapped with extra insulation. Fill all gaps with RTV caulk. This will prevent noise transmission between the tubing and the foundation or wall.

Along floor or ceiling joists, suspend refrigerant lines so that they do not contact the building structure, water pipes, or ductwork. Use insulated or suspension type hangers. Metal straps must be at least 1” wide to avoid cutting into the tube insulation. Keep the liquid and suction lines separate. Refer to Figure 5.

Figure 5

Routing and Suspending Refrigerant Lines

 

OUTDOOR WALL

INDOOR WALL

 

JOIST

HANGER STRAP

 

 

 

 

CAULK

 

(AROUND SUCTION

INSULATION

LIQUID TUBE

TUBE ONLY)

 

 

 

SUCTION TUBE

SUCTION TUBE

INSULATION

1” MIN

LIQUID TUBE

THROUGH THE WALL

SUSPENSION

!CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in improp‐ er product operation.

Do not bury more than 36” of line set underground. Refrigerant may migrate to cooler buried section during extended periods of unit shut-down, caus‐ ing refrigerant slugging and possible compressor damage at start-up.

If ANY section of the line set is buried under‐ ground, provide a minimum 6” vertical rise at the service valve.

D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT

Proper oil return to the compressor should be maintained with suction gas velocity. If velocities drop below 1500 fpm (feet per minute), oil return will be decreased. To maintain suction gas velocity, do not upsize vertical suction risers. Use the “<80 feet” suction line sizes shown Figure 4.

Install oil traps every 20 feet of vertical suction line riser (refer to Figure 6).

NOTE: If there is more than 20 feet vertical separation between outdoor and indoor units, refer to the Long Line Application Guidline document for additional instructions.

Figure 6

Oil Traps for Outdoor Unit Higher

than Indoor Coil

 

 

10” Max.

3” Min.

20 ft.

20 ft.

E. LIQUID LINE FILTER-DRIER

Outdoor units are shipped with an appropriate filter-drier for installation in the liquid line. Leave the plugs in the tube ends until the filter-drier is installed. The optimal location for the filter-drier is close to the indoor coil. Heat pump filter-driers are “bi-flow” type. Either end can be pointed towards indoor coil. Refer to Figure 7.

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