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(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 counter measure
shown below:
• Counter measure 1
Provide opening for ventilation.
Provide 0.15% or more opening to floor space both above and below door, or provide opening without
door.
• Counter measure 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.
Smallest
room
Refrigerant concentration
(kg/m
3
)
(R410A)
Gas leak alarm
Mechanical ventilator
Indoor unit
Caution For Refrigerant Leak
Outdoor unit
Indoor unit
In case the result of calculation exceeds
the limiting concentration, perform the
3
)
same calculations by shifting to the
second smallest, and the third smallest
rooms until at last the result is below the
limiting concentration.
Countermeasure 1 Opening effective to ventilation
Installation Manual 67
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