10. Caution For Refrigerant Leaks - Daikin RZQ24MVJU Installation Manual

When nothing is displayed in the remote controller
• There might be a problem with the connection or transmission
between the indoor unit and the remote controller.
Check connections, and check for wire breakage.
CAUTION
<To piping technician>
<To electrician>
• After finishing the test operation and before using the unit by
customer, confirm that the outside panels and screws are
attached securely to the units.

10. CAUTION FOR REFRIGERANT LEAKS

DANGER
• Refrigerant gas is heavier than air and replaces oxygen. A massive
leak could lead to oxygen depletion, especially in basements, and an
asphyxiation hazard could occur leading to serious injury or death.
(Points to note in connection with refrigerant leaks)
Introduction
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.
The Split System, like other air conditioning systems, uses R410A as
refrigerant. R410A itself is an entirely safe non-toxic, non-combustible
refrigerant. Nevertheless care must be taken to ensure that air condi-
tioning facilities are installed in a room which is sufficiently large. This
assures that the maximum concentration level of refrigerant gas is not
exceeded, in the unlikely event of major leak in the system and this in
accordance to the local applicable regulations and standards.
Maximum concentration level
The maximum charge of refrigerant and the calculation of the maximum
concentration of refrigerant is directly related to the humanly occupied
space in to which it could leak.
The unit of measurement of the concentration is lb./ft
3
of the refrigerant gas in 1ft volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
Direction of the refrigerant flow
Pay a special attention to the place, such as a basement, etc.
where refrigerant can stay, since refrigerant is heavier than air.
Procedure for checking maximum concentration
Check the maximum concentration level in accordance with steps 1 to 4
below and take whatever action is necessary to comply.
1. Calculate the amount of refrigerant (lb.) charged to each system
separately.
amount of refriger- additional charging
+
ant in the unit amount (amount of
(amount of refrig- refrigerant added
erant with which locally in accordance
the system is with the length or
charged before diameter of the refrig-
leaving the factory) erant piping)
16
2. Calculate a room volume (ft
3. Calculate the refrigerant concentration by using the results of the
total amount of refrigerant in the
system
volume (ft
there is an indoor unit installed
4. Deal with the situations where the result exceeds the maximum con-
3
( the weight in lb.
Room where
refrigerant leak
has occurred
(outflow of all the
refrigerant from
the system)
total amount
=
of refriger-
ant (lb.) in
the system
NOTE
• Where a single refrigerant facility is divided into 2 entirely indepen-
dent refrigerant systems then use the amount of refrigerant with
which each separate system is charged.
3
calculations in steps 1 and 2 above.
3
) of the room in which
centration level.
Where the installation of a facility results in a concentration in excess
of the maximum concentration level then it will be necessary to revise
the system.
Please consult your dealer.
)
≤ maximum concen-
3
tration level (lb./ft )