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Elevate Unit
Accumulation of water and ice in base pan may cause
equipment damage.
Elevate unit per local climate and code requirements to
provide clearance above estimated snowfall level and ensure
adequate drainage of unit. Use snow stand in areas where
prolonged freezing temperatures are encountered.
If conditions or local codes require the unit be attached to
pad or mounting frame, tie down bolts should be used and
fastened through knockouts provided in unit base pan.
Roof Top Installations
Mount on level platform or frame 6 inches above roof
surface. Place unit above a load-bearing wall and isolate unit
and tubing set from structure. Arrange supporting members
to adequately support unit and minimize transmission of
vibration to building. Ensure roof structure and anchoring
method is adequate for location. Consult local codes
governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may
require wind baffles to achieve adequate defrost. A sheet
metal baffle should be spaced 6-1/2" from the fall of the coil.
The height should cover the face of the coil and the length
should be 6" from the access panel.
NOTE: Unit must be level to within ± 2 (± 3/8 in./ft) per
compressor manufacturer specifications.
Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. For proper airflow,
quiet operation and maximum efficiency. Position so water,
snow, or ice from roof or eaves cannot fall directly on unit.
507710-01
CAUTION
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
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
•
with clearance less than 2 ft. from a second unit
•
with clearance less than 4 ft. on top of unit
Operating Ambient
The minimum outdoor operating ambient in cooling mode is
55°F, and the maximum outdoor operating ambient in cooling
mode is 125°F. The maximum outdoor operating ambient
in heating mode is 66°F.
Refrigeration Line Sets
Use only refrigerant grade copper tubes. Split systems
may be installed with up to 50 feet of line set (no more than
20 feet vertical) without special consideration (see long line
set guidelines).
Recommended Liquid & Vapor Tube Diameters (In.)
Unit
Size
Connections Dia.
018
3/8"
3/8"
024
3/8"
030
036
3/8"
042
3/8"
048
3/8"
060
3/8"
* FIELD SUPPLIED 7/8 X 1-1/8 CONNECTOR REQUIRED ON BOTH ENDS OF VAPOR TUBING.
It is important that no tubing be cut or seals broken until you
are ready to actually make connections to the evaporator
and to the condenser section. DO NOT remove rubber
plugs or copper caps from the tube ends until ready to
make connections at evaporator and condenser. Under no
circumstances leave the lines open to the atmosphere for
any period of time, if so unit requires additional evacuation
to remove moisture.
Be extra careful with sharp bends. Tubing can "kink" very
easily, and if this occurs, the entire tube length will have
to be replaced. Extra care at this time will eliminate future
service problems.
It is recommended that vertical suction risers not be up-
sized. Proper oil return to the compressor should be
maintained with suction gas velocity.
Issue 1148
LIQUID
VAPOR
Tube Dia.
Connections Dia.
3/8"
3/4"
3/8"
3/4"
3/8"
3/4"
3/8"
7/8"
3/8"
7/8"
3/8"
7/8"
3/8"
7/8"
Tube Dia.
3/4"
3/4"
3/4"
7/8"
7/8"
7/8"
*1-1/8
Page 3 of 16
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