
1. Information for Refrigerant
3
MULTI
Installation of Outdoor Units
1.2 Caution For Refrigerant Leaks
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.
1.2.1 Concentration limit
1.2.2 Checking procedure of limiting concentration
Check concentration limit along following steps and take appropriate measure depending on the situation.
■
Calculate refrigerant concentration
1.
Calculate amount of all the replenished refrigerant (kg) per each refrigerant system.
2.
Calculate the volume of the room where indoor unit is installed as single room or the smallest room.
Concentration limit is the limit of Freon gas concentration where immediate measures can be taken without
hurting human body when refrigerant leaks in the air. The concentration limit shall be described in the unit of
kg/m
3
(Freon gas weight per unit air volume) for facilitating calculation.
Concentration limit : 0.44kg/m
3
(R410A)
Without partition
With partition but opened which
serve passage of air to adjoining
room
With partition and without opening
which serve as passage of air to
adjoining room
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 refrigerant
in the system
(kg)
R
d
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.
Amount of pre-charged
refrigerant per single
system
Amount of replenished
refrigerant at factory shipment
Amount of additionally
replenished refrigerant
depending on piping
length or piping
diameter by customer
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)
Outdoor unit
Indoor unit
Smallest
room
Содержание A2UW18GFAC
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