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Indoor unit
The smallest
room
The second
smallest room
Outdoor unit
Ventilation apparatus
Indoor unit
Opening
Wall
Outdoor unit
(Situation in which there are no door openings or
in which there are openings above and blow
doors that occupy at least 0.15% of the floor area)
(3) Use the results of calculations (1) and (2) to calculate the refrigerant concentration:
If the calculation results do not exceed the maximum concentration, perform the same calculations for the larger second and
third room, etc., until it has been determined that nowhere will the maximum concentration be exceeded.
(b) There are partitions, but there are openings that allow the effective mixing of air.
(c) If the smallest room has mechanical ventilation
Apparatus that is linked to a household gas detection and alarm device, the calculations should be performed for
the second smallest room.
Total refrigerant in the refrigerating unit (O[lbs])
[ maximum concentration
The smallest room in which an indoor (O/K[lbs/ft³])
unit has been installed (K[ft³])
Maximum concentration of
R410A: 0.3O/K[0.019 lbs/ft³]