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11-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
Indoor unit
The smallest
room
The second
smallest room
Outdoor unit
Ventilation apparatus
Branch box
Indoor unit
Branch box
Opening
Wall
Outdoor unit
(Situation in which there
are no door openings or
in which there are open-
ings above and below
doors that occupy at
least 0.15% of the floor
area)
Indoor unit
Branch box
Outdoor unit
11-2-1. Introduction
R410A refrigerant of this air conditioner is non-toxic and
non-flammable but leaking of large amount from an indoor
unit into the room where the unit is installed may be deleteri-
ous.
To prevent possible injury, the rooms should be large
enough to keep the R410A concentration specified by KHK:
(a high pressure gas safety association) installation guide-
lines S0010 as follows.
Note:
When single refrigeration system consists of several inde-
pendent refrigeration circuit, figure out the total refrigerant
amount by each independent refrigerant circuit.
Follow (1) to (3) to confirm the R410A concentration and take
appropriate treatment, if necessary.
(1) Calculate total refrigerant amount by each refrig-
erant system.
Total refrigerant amount is precharged refrigerant
at ex-factory plus additional charged amount at
field installation.
(2) Calculate room volumes (m
3
) and find the room
with the smallest volume
The part with represents the room with the smallest
volume.
(a) Situation in which there are no partitions
(3) Use the results of calculations (1) and (2) to cal-
culate the refrigerant concentration:
If the calculation results do not exceed the maximum concen-
tration, perform the same calculations for the larger second
and third room, etc., until it has been determined that nowhere
the maximum concentration will be exceed.
Indoor unit
All refrigerant of this system will leak out to this
room if there is leakage at this indoor unit.
Direction
of refrigerant flow
Outdoor unit
Branch box
Maximum concentration
Maximum refrigerant concentration of R410A of a room
is 0.3 kg/K accordance with the installation guidelines.
To facilitate calculation, the maximum concentration is
expressed in units of O/K ( kg of R410A per K)
(KHK installation guidelines S0010)
Maximum concentration of R410A: 0.3O/K
11-2-2. Confirming procedure of R410A concentration
(b) There are partitions, but there are openings that allow
the effective mixing of air.
(c) If the smallest room has mechanical ventilation appa-
ratus that is linked to a household gas detection and
alarm device, the calculations should be performed for
the second smallest room.
Total refrigerant in the refrigerating unit (O)
[ Maximum concentration(O/K)
The smallest room in which an indoor
unit has been installed (K)
Maximum concentration of R410A:0.3O/K
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