64 Outside Unit
Caution for Refrigerant Leak
(3) With partition and without opening which serve as passage of air to adjoining room
n Calculate refrigerant concentration
n In case the concentration exceeds the limit
When the concentration exceeds the limit, change original plan or take one of the countermeasures
shown below:
• Countermeasure 1
Provide opening for ventilation.
Provide 0.15% or more opening to floor space both above and below door, or provide opening without
door.
• Countermeasure 2
Provide gas leak alarm linked with mechanical ventilator.
Pay special attention to the place, such as a basement, etc. where refrigerant can be present, since
refrigerant is heavier than air.
Outdoor unit
Indoor unit
Smallest
room
(R410A)
Refrigerant concentration
(lb/ft
3
)
Total amount of replenished
refrigerant in refrigerant facility (kg(lbs))
Capacity of smallest room where
indoor unit is installed (ft
3
)
In case the result of calculation exceeds
the limiting concentration, perform the
same calculations by shifting to the
second smallest, and the third smallest
rooms until at last the result is below the
limiting concentration.
Countermeasure 2
Gas leak alarm
Mechanical ventilator
Countermeasure 1
Opening effective to ventilation
Indoor unit
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