3
Rooftop Installations
If it is necessary to install this unit on a roof structure, ensure the
roof structure can support the weight and that proper
consideration is given to the weather-tight integrity of the roof.
Since the unit can vibrate during operation, sound vibration
transmission should be considered when installing the unit.
Vibration absorbing pads or springs can be installed between the
unit legs or frame and the roof mounting assembly to reduce
noise vibration.
NOTE: These units require special location consideration in areas
of heavy snow accumulation and/or areas with prolonged
continuous subfreezing temperatures. Heat pump unit bases
have cutouts under the outdoor coil that permit drainage of frost
accumulation.
Situate the unit to permit free unobstructed drainage of the
defrost water and ice. In more severe weather locations, it is
recommended that the unit be elevated to allow unobstructed
drainage and airflow.
The following elevation minimums are recommended:
SAFE REFRIGERANT HANDLING
While these items will not cover every conceivable situation, they
should serve as a useful guide.
Design Temperature
Suggested Minimum Elevation
+15ºF (-9ºC) and above
2
¹⁄₂
" (6.4 cm)
-5º (-20.6ºC) to +14º (-10ºC)
8" (20.3 cm)
below -5º (-20.6ºC)
12" (30.5 cm)
Goodman 12
WARNING
To avoid possible injury, explosion or death, practice safe
handling of refrigerants.
Goodman 13
WARNING
Refrigerants are heavier than air. They can “push out”
the oxygen in your lungs or in any enclosed space. To
avoid possible difficulty in breathing or death:
• Never purge refrigerant into an enclosed room or
space. By law, all refrigerants must be reclaimed.
• If an indoor leak is suspected, throughly ventilate the
area before beginning work.
• Liquid refrigerant can be very cold. To avoid possible
frostbite or blindness, avoid contact and wear gloves
and goggles. If liquid refrigerant does contact your
skin or eyes, seek medical help immediately.
• Always follow EPA regulations. Never burn refrigerant,
as poisonous gas will be produced.
Goodman 14
WARNING
To avoid possible explosion:
• Never apply flame or steam to a refrigerant cylinder. If
you must heat a cylinder for faster charging, partially
immerse it in warm water.
• Never fill a cylinder more than 80% full of liquid
refrigerant.
• Never add anything other than R-22 to an R-22 cylinder
or R-410A to an R-410A cylinder. The service
equipment used must be listed or certified for the type
of refrigerant used.
• Store cylinders in a cool, dry place. Never use a cylinder
as a platform or a roller.
Goodman 15
WARNING
To avoid possible explosion, use only returnable (not
disposable) service cylinders when removing refrigerant
from a system.
• Ensure the cylinder is free of damage which could lead
to a leak or explosion.
• Ensure the hydrostatic test date does not exceed 5 years.
• Ensure the pressure rating meets or exceeds 400 lbs.
When in doubt, do not use cylinder.
