5
Safety Considerations
1. Calculate the amount of refrigerants (1b) charged to each system separately.
Amount of refrigerants in a single unit system (amount of refrigerant with which the system is charged
before leaving the factory)
+
Additional charging amount (amount of refrigerant added locally in accordance with the length or
diameter of the refrigerant piping)
=total amount of refrigerants (1b) in the system.
NOTE
Where a single refrigerant facility is divided into 2 entirely independent refrigerant systems then use
the amount of refrigerants with which each separate system is charged.
2. Calculate the smallest room volume(ft³)
Incase like the following, calculate the volume of (A), (B) as a single room or as the smallest room.
A. Where there are no smaller room divisions
B. Where there is a room division but there is an opening between the rooms sufficiently large to
permit a free flow of air back and forth.
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