International comfort products N2H3 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
contact with the building structure. Make openings large
Figure 4
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
suction risers.
6
Routing and Suspending Refrigerant Lines
INDOOR WALL
LIQUID TUBE
SUCTION TUBE
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 4.
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
1" MIN
SUSPENSION
E. DUAL FUEL APPLICATIONS
WARNING
!
PERSONAL INJURY
HAZARD
Failure to follow this warning could result in
personal injury, death, and/or product damage.
Dual fuel applications require a High Pressure
Switch. Refer to Product Specifications literature
for kit part number. (Some models may have High
Pressure Switch factory installed.)
JOIST
INSULATION
SUCTION TUBE
LIQUID TUBE
- PRODUCT DAMAGE
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