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Caution For Refrigerant Leak
(3) With partition and without opening which serve as passage of air to adjoining room
■ Calculate refrigerant concentration
Total amount of replenished
refrigerant in refrigerant facility (kg)
Capacity of smallest room where
indoor unit is installed (m
■ 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.
Countermeasure 2
Pay special attention to the place, such as a basement, etc. where refrigerant can be present, since
refrigerant is heavier than air.
64
Outdoor Unit
Smallest
room
≤>
Refrigerant concentration
3
)
(R410A)
Gas leak alarm
Mechanical ventilator
Indoor unit
In case the result of calculation exceeds
the limiting concentration, perform the
(kg/m
3
)
same calculations by shifting to the
second smallest, and the third smallest
rooms until at last the result is below the
limiting concentration.
Indoor unit
Countermeasure 1 Opening effective to ventilation
Outdoor unit
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