Rooftop Installations; Safe Refrigerant Handling - Whirlpool WHP43 Installation Instructions Manual

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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
While these items will not cover every conceivable situation, they
should serve as a useful guide.
To avoid possible injury, explosion or death, practice safe
handling of refrigerants.
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.
Goodman 13
• 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.

Rooftop Installations


Goodman 12
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:
Design Temperature
+15ºF (-9ºC) and above
-5º (-20.6ºC) to +14º (-10ºC) 8" (20.3 cm)
below -5º (-20.6ºC)
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.
Goodman 14
• Never fill a cylinder more than 80% full of liquid
• 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.
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.
Suggested Minimum Elevation
2¹⁄₂" (6.4 cm)
12" (30.5 cm)
Goodman 15

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