INSTALLATION INSTRUCTIONS
R
−
22 Split System Air Conditioner
4
421 01 5203 02
Specifications subject to change without notice.
B. REFRIGERANT LINE SETS
The refrigerant line set must be properly sized to assure
maximum efficiency and proper oil circulation.
Refer to Product Specifications and Long Line
Applications Guideline for line set sizing
.
NOTE:
Total line set length must not exceed 200 feet
(61m).
A crankcase heater must be used when the refrigerant
line length exceeds 80 feet (24.4m).
If outdoor unit is more than 10 feet (3m) higher than the
indoor coil, refer to the Long Line Applications Guideline
manual for instructions.
When the outdoor unit is higher than the indoor coil, the
vertical separation must not exceed 100 feet (30m).
When the outdoor unit is lower than the indoor coil, the
vertical separation must not exceed 50 feet (15.2m).
If it is necessary to add refrigerant line in the field, use
dehydrated or dry, sealed, deoxidized, copper
refrigeration tubing. Do not use copper water pipe.
Do not remove rubber plugs or caps from copper tubing
until connections are ready to be made.
Be extra careful when bending refrigeration tubing.
Tubing can “kink” easily, and if this occurs, the entire
length of tubing must be replaced.
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in
improper product operation.
Do not leave system open to atmosphere any
longer than absolutely required for installation.
Internal system components
−
especially
refrigerant oils
−
are extremely susceptible to
moisture contamination. Keep ends of tubing
sealed during installation until the last possible
moment.
!
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in
personal injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal. Use all service
ports and open all flow
−
control devices, including
solenoid valves.
Federal regulations require that you do not vent
refrigerant to the atmosphere. Recover during
system repair or final unit disposal.
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. 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” (25mm) 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
improper product operation.
Do not bury more than 36” (1m) of line set
underground. Refrigerant may migrate to cooler
buried section during extended periods of unit
shut
−
down, causing refrigerant slugging and
possible compressor damage at start
−
up.
If ANY section of the line set is buried
underground, provide a minimum 6” (152mm)
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.
E. LIQUID LINE FILTER
−
DRIER
NOTE:
It is required that an approved filter drier (XH-6
with 25% activated alumina/75% molecular sieve
desiccants) be installed in the liquid line due to the POE
oil.
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.
