ENGLISH
Installation Manual 63
Caution for Refrigerant Leak
The installer and system specialist shall secure safety against leakage according to local regulations or standards.
The following standards may be applicable if local regulations are not available.
Though the R410A refrigerant is harmless and incombustible itself , the room to equip the air conditioner should be large enough to
such an extent that the refrigerant gas will not exceed the limiting concentration even if the refrigerant gas leaks in the room
.
n Limiting concentration
Check limiting concentration along following steps and take appropriate measure depending on the situation.
n Calculate amount of all the replenished refrigerant (kg (lbs)) per each refrigerant
sys-
tem.
n Calculate minimum room capacity
Calculate room capacity by regarding a portion as one room or the smaller room.
(1) Without partition
(2) With partition and with opening which serve as
passage of air to adjoining room
Caution for Refrigerant Leak
Introduction
Checking procedure of limiting concentration
Limiting concentration is the limit of Freon gas concentration where immediate measures can be taken with-
out hurting human body when refrigerant leaks in the air. The limiting concentration shall be described in the
unit of kg/m
3
(lb/ft
3
) (Freon gas weight per unit air volume) for facilitating calculation.
Limiting concentration: 0.44kg/m
3
(0.028(lb/ft
3
))(R410A)
Outdoor unit
(No.1 system)
Flow of
refrigerant
Indoor unit
Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)
Amount of additional
replenished refrigerant
Total amount of replenished
refrigerant in refrigerant
facility (kg (lbs))
+
=
Note : In case one refrigerant facility is
divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.
Outdoor unit
Indoor unit
Outdoor unit
Indoor unit
Opening
Partition
In the case of opening
without door , or 0.15
% or more openings
(to floor space) both
above and below door)
Amount of replenished
refrigerant per one outdoor
unit system
Amount of replenished
refrigerant at factory shipment
Amount of additionally
replenished refrigerant
depending on piping
length or piping
diameter at customer
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