25
Installation manual
Fig.7-2
7.5 Caution on refrigerant leakage
7.6 Hand over to the customer
This air conditioner uses R410A as refrigerant, which is
safe and noncombustible.
The room housing the air conditioner should be big
enough so that a refrigerant leakage cannot reach critical
thickness.
Critical thickness-----the max thickness of Freon without
harming people. R410A critical thickness: 0.42 [ kg/m
3
]
Outdoor unit
Indoor unit
Room full of leaking refrigerant
(all refrigerant has leaked out)
Fig.7-3
A [ kg]
B [ m
3
]
Countermeasure against excessive thickness
Install a mechanical ventilator to reduce the refrigerant
thickness to under the critical level (ventilate regularly).
Install a leakage detector alarm for the mechanical
ventilator if you cannot regularly ventilate the room.
≤
Critical thickness：0.42 [kg/m
3
]
Indoor unit
OA
a: Ventilation opening
b.
A leakage detector alarm
for mechanical ventilator
Give the installation manual for the indoor unit and outdoor
unit to the user.
Calculate the critical thickness as follows and take the
necessary action.
Calculate the sum of the charge volume (A[kg])
Total refrigerant volume=refrigerant volume when
delivered (nameplate)+super addition
Calculate the indoor cubage (B[m3]) (as the minimum
cubage)
Calculate the refrigerant thickness.
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