International comfort products N4A3 Series Installation Instructions Manual page 6

INSTALLATION INSTRUCTIONS
WARNING
!
PERSONAL INJURY HAZARD
Failure to relieve system pressure could result in
personal injury and/or death.
Relieve pressure and recover all refrigerant before
servicing existing equipment, and before final unit
disposal. Use all service ports and open all flow-
control devices, including solenoid valves.
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
enough so that lines can be wrapped with extra insulation.
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.
6
Routing and Suspending Refrigerant Lines
INDOOR WALL
LIQUID TUBE
SUCTION TUBE
R-410A Split System Air Conditioner
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.
CAUTION
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improp‐
er product operation.
Do not leave system open to atmosphere any lon‐
ger than absolutely required for installation. Inter‐
nal system components - especially refrigerant
oils - are extremely susceptible to moisture con‐
tamination. Keep ends of tubing sealed during
installation until the last possible moment.
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
1" MIN
SUSPENSION
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.
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. Install the
filter-drier with the arrow pointing towards the indoor coil.
Refer to Figure 5.
JOIST
INSULATION
SUCTION TUBE
LIQUID TUBE
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