Table of Contents
Advertisement
10-2. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
10-2-1. 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.
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)
Maximum concentration of
(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 R410A concentration
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
amount at ex-factory plus additional 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.
: 0.3
/
R410A
O
K
(2) Calculate room volumes (K) 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
(b) There are partitions, but there are openings that allow
the effective mixing of air.
Indoor unit
Opening
Wall
(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
The second
room
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.
76
Outdoor unit
Outdoor unit
(situation in which there
are no door openings or
in which there are open-
ings above and blow
doors that occupy at
least 0.15% of the floor
area)
Outdoor unit
Indoor unit
[ maximum concentration(O/K)
Maximum concentration of R410A:0.3O/K
Hide quick links:
Advertisement
Table of Contents
