Safety Precautions
1. Always wear safety eye wear, work gloves and
protective clothing when installing equipment.
2. Never assume electrical power is disconnected. Use a
meter to verify power is disconnected.
3. Keep hands out of fan areas when power is connected
to equipment.
4. Have a fire extinguisher available.
5. R-22 causes frost-bite burns.
6. R-22 is toxic when burned.
7. The weight of the unit requires caution and proper
handling procedures when lifting or moving to avoid
personal injury. Use care to avoid contact with sharp
or pointed edges.
NOTE TO INSTALLING DEALER:
These instructions and warranty are to be given to
the owner or prominently displayed near the indoor
furnace/air handler unit.
Unit Location
The remote condensing unit is to be installed on a solid
foundation. This foundation should extend a minimum of
2" (inches) beyond the sides of the condensing unit and
must be level. To reduce the possibility of noise
transmission, the foundation slab should NOT be in contact
with or be an integral part of the building foundation.
The "top discharge" condenser air is taken in through the
condenser coil and is discharged out the top. For quiet
operation and maximum efficiency, eliminate any
obstructions which might interfere with air discharge.
Zoning ordinances may govern the minimum distance the
condensing unit can be installed from the property line.
Check before proceeding.
Locate the outdoor unit as close to the indoor unit as
possible to avoid any long refrigeration line runs. Allow a
minimum of 36" (inches) on the service panel side of the
unit for service. Ensure there is a minimum of 24" (inches)
clearance on two of the sides and 12" (inches) on the
other side. A minimum vertical clearance of 60" (inches)
is required to overhang. Allow at least 24" (inches)
between multiple units.
DO LOCATE THE UNIT:
• with proper clearances on sides and top of unit.
• on a solid, level foundation or pad
• to minimize refrigerant line lengths.
• to allow for drainage of defrost water and prevent ice
build-up (heat pump only)
• above expected snowfall levels (heat pump only).
DO NOT LOCATE THE UNIT:
• on brick, concrete blocks or unstable surfaces.
• near clothes dryer exhaust vents.
• near sleeping area or near windows.
• under eaves where water, snow or ice can fall directly
on the unit.
Roof Top Installations
If necessary to install units on a roof structure, be sure
to elevate and level the units. The unit must be installed
at least 6" (inches) above the roof surface. Ensure the
roof structure and anchoring method is adequate for unit
location. Isolate unit and tubing from building structure.
Consult local codes regarding rooftop mounting.
Evaporator Piston Selection
The condensing unit must be matched to an approved
evaporator. Refer to the unit specification sheet furnished
with the unit or unit rating plate for proper size piston. If
the evaporator coil does not have a piston already installed
or if the piston installed is not the one indicated, a
replacement piston is required. The correct number piston
is included with unit or may be purchased from a
wholesale distributor. See the evaporator coil (indoor unit)
instructions for details of changing the piston.
The evaporator coil may also use a thermal expansion
valve (TXV) in place of a piston.
NOTE: The proper piston or thermostatic expansion
valve MUST be installed in the indoor coil
prior to installation of refrigerant lines.
Refrigeration Line Sets
Fully annealed refrigeration lines should be used when
installing the system. DO NOT use copper water pipe.
Refer to unit specification sheet for proper line set sizes.
Table 1 lists line set sizes if specification sheet is not
available. Split systems may be installed with up to 50 feet
of line set (no more than 20 feet vertical) without special
consideration. For other lengths, contact your distributor
technical service.
Table 1 Line set sizes
Unit Size Liquid Line Vapor Line
18 3/8" * 5/8"
24 3/8" * 5/8"
30 3/8" 3/4"
36 3/8" 3/4"
42 3/8" 7/8"
48 3/8" 7/8"
60 3/8" 1-1/8" **
* Up to 25 feet of 1/4" line is permissible
** 7/8" permissible, resulting in 3-4% capacity reduction
20407502 ISSUE 0144 Page 2 of 8
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