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9 PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
Indoor unit
Outdoor unit
9-1. 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 deleterious.
To prevent possible injury, the rooms should be large enough to keep the R410A concentration specified by KHK : (a high pres-
sure gas safety association) installation guidelines S0010 as follows.
Note:
When single refrigeration system is consists of several independent refrigeration circuit, figure out the total refrigerant
amount by each independent refrigerant circuit.
(2) Calculate room volumes (K[ft³]) 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
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
* Maximum concentration
Maximum refrigerant concentration of R410A of a room is 0.30
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[0.019lbs/ft³]
9-2. CONFIRMING PROCEDURE OF R410A CONCENTRATION
Follow (1) to (3) to confirm the R410A concentration and take appropriate treatment, if necessary.
(1) Calculate total refrigerant amount by each refrigerant system.
Total refrigerant amount is precharged refrigerant amount at ex-factory plus additional charged amount
at field installation.
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.