KeepRite N4A3 Installation Instructions Manual page 6

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 con-
tact with the building structure. Make openings large
Figure 5
OUTDOOR WALL
CAULK
INSULATION
THROUGH THE WALL
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 suc-
tion 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).
6
Routing and Suspending Refrigerant Lines
INDOOR WALL
LIQUID TUBE
SUCTION TUBE
R−410A Split System Air Conditioner
enough so that lines can be wrapped with extra insulation.
Fill all gaps with RTV caulk. This will prevent noise trans-
mission 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 suc-
tion lines separate. Refer to Figure 5.
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
1" MIN
SUSPENSION
Oil Traps for Outdoor Unit Higher
Figure 6
JOIST
INSULATION
SUCTION TUBE
LIQUID TUBE
than Indoor Coil
10" Max.
3" Min.
20 ft.
20 ft.
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