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ELECTRICAL WIRING
88
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.
Introduction
Though the R410A refrigerant is harmless and incombustible itself , the room to equip the air
conditioner should be large to such an extent that the refrigerant gas will not exceed the limiting
concentration even if the refrigerant gas leaks in the room.
Limiting concentration
Limiting concentration is the limit of Freon gas concentration where immediate measures can
be taken without hurting human body when refrigerant leaks in the air. The limiting
concentration shall be described in the unit of kg/m
for facilitating calculation.
Checking procedure of limiting concentration
Check limiting concentration along following steps and take appropriate measure depending on
the situation.
Calculate amount of all the replenished refrigerant (kg) per each refrigerant system.
Amount of replenished
Amount of additional
+
refrigerant per one outdoor
replenished refrigerant
unit system
Amount of replenished
Amount of additionally
refrigerant at factory shipment
replenished refrigerant
depending on piping
length or piping
diameter at customer
Calculate minimum room capacity
Calculate room capacity by regarding a portion as one room or the smaller room.
- Without partition
Indoor unit
Limiting concentration: 0.44 kg/m
Outdoor unit
Flow of
(No.1 system)
refrigerant
Indoor unit
Total amount of replenished
=
refrigerant in refrigerant
facility (kg)
Note : In case one refrigerant facility is
Outdoor unit
3
(Freon gas weight per unit air volume)
3
(R410A)
Room where refrigerant leaks
(Refrigerant of the whole No.1
system flows out.)
divided into 2 or more refrigerant
systems and each system is
independent, amount of replenished
refrigerant of each system shall be
adopted.
- With partition and with opening which serve
as passage of air to adjoining room
Indoor unit
Opening
Partition
Outdoor unit
In the case of opening
without door , or 0.15
% or more openings
(to floor space) both
above and below door)
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