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UNIT PIPING
Refrigerant Safety
WARNING
Verify the maximum refrigerant concentration in the space
where the indoor unit will be mounted meets the concentration
limit allowed by ASHRAE Standards 15-2010 and 34-2010.
There is danger of asphyxiation from oxygen displacement.
ASHRAE Standards 15-2010 and 34-2010 offer
guidelines that address refrigerant safety and the
maximum allowable concentration of refrigerant in an
occupied space. Refrigerant will dissipate into the
atmosphere, but a certain volume of air is required for
this to occur safely. For R410A refrigerant, the maximum
allowable concentration of refrigerant is twenty-six (26)
lbs. per 1,000 cubic feet of an occupied space. Buildings
with twenty-four (24) hour occupancy allow half of that
concentration.
1
ASHRAE Standards 15 and 34 assume that if a system
develops a leak, its entire refrigerant charge will dump
into the area where the leak occurs. To meet ASHRAE
Standards 15 and 34, calculate the refrigerant
concentration that may occur in the smallest room
volume on the system, and compare the results to the
maximum allowable concentration number.1 Also
consult state and local codes in regards to refrigerant
safety.
1 Information about ASHRAE Standard 15-2010 / 34-2010 and
addenda current as of the date of this publication
Piping Materials and Handling
Pipes used for the refrigerant piping system must include
the specified thickness, and the interior must be clean.
While handling and storing, do not bend or damage the
pipes, and take care not to contaminate the interior with
dust, moisture, etc. Keep refrigerant pipe dry, clean, and
airtight
.
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