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10-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
10-2-1. Introduction
R-22 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 deleterious.
To prevent possible injury, the rooms should be large
enough to keep the R-22 concentration specified by KHK :
(a high pressure gas safety association) installation guide-
lines S0010 as follows.
Maximum concentration
Maximum refrigerant concentration of R-22 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 R-22 per K)
Maximum concentration of R-22: 0.3
(KHK installation guidelines S0010)
Outdoor unit
Direction
of refrigerant flow
Indoor unit
All refrigerant of this system will leak out to this
room if there is leakage at this indoor unit.
10-2-2. Confirming procedure of R-22 concentration
Follow 1) to 4) to confirm the R-22 concentration and take
appropriate treatment, if necessary.
(1) Calculate total refrigerant amount by each refrig-
erant system based on one indoor unit.
Total refrigerant amount is prechrged refrigerant
amount of the indoor unit at ex-factory plus addi-
tional charged amount at field installation.
Note:
When single refrigeration system is consists of several
independent refrigeration circuit, figure out the total refrig-
erant amount by each independent refrigerant circuit.
(2) Calculate room volumes (in K
with the smallest volume
The part with
volume.
(a) Situation in which there are no partitions
/
O
K
(b) There are partitions, but there are openings that allow
the effective mixing of air.
Indoor unit
(c) If the smallest room has mechanical ventilation appara-
tus that is linked to a household gas detection and
alarm device, the calculations should be performed for
the second smallest room.
Ventilation apparatus
The smallest
room
(3) Use the results of calculations (1)and (2) to calcu-
late the refrigerant concentration:
Total refrigerant in the refrigerating unit (O)
The smallest room in which an indoor
unit has been installed (K)
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
will the maximum concentration be exceeded.
110
K ) and find the room
represents the room with the smallest
Outdoor unit
Indoor unit
Outdoor unit
(situation in which there
are no door openings or
in which there are open-
Opening
ings above and blow
doors that occupy at
Wall
least 0.15% of the floor
area)
Outdoor unit
Indoor unit
The second
smallest room
[ maximum concentration(O/K)
Maximum concentration of R-22:0.3O/K
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