Caution For Refrigerant Leaks - Daikin VRV II RXYQ5MY1B Installation Manual

Insufficient E4
refrigerant F3
Temperature adjustment operation confirmation
• After the test run is over, operate the unit normally. (Heating is not
possible if the outdoor temperature is 24°C or higher.)
• Make sure the indoor and outdoor units are operating normally
(If a knocking sound can be heard in the liquid compression of
the compressor, stop the unit immediately and then energize
the heater for a sufficient length of time before restarting the
operation.)
• Run each indoor unit one at a time and make sure the corre-
sponding outdoor unit is also running.
• Check to see if cold (or hot) air is coming out of the indoor unit.
• Press the fan direction and fan strength buttons on the indoor
unit to see if they operate properly.
Caution
〈 〈 〈 〈 Cautions for normal operation check〉 〉 〉 〉
• Once stopping, the compressor will not restart in about 5 minutes
even if the Run/Stop button of an indoor unit in the same system
is pressed.
• When the system operation is stopped by the remote controller,
the outdoor units may continue operating for further 5 minutes at
maximum.
• If the system has not undergone any check operation by the test
operation button since it was first installed, an error code "U3" is
displayed. In this case, perform check operation referring to
"8-2 Test run".
• After the test run, when handing the unit over to the customer,
make sure the electric box lid, the service lid, and the unit casing
are all attached.
9.

CAUTION FOR REFRIGERANT LEAKS

(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 follow-
ing standards may be applicable if local regulations are not
available.
The VRV System, like other air conditioning systems, uses R410A as
refrigerant. R410A itself is an entirely safe non-toxic, non-combusti-
ble refrigerant. Nevertheless care must be taken to ensure that air
conditioning facilities are installed in a room which is sufficiently
large. This assures that the maximum concentration level of refriger-
ant gas is not exceeded, in the unlikely event of major leak in the sys-
tem and this in accordance to the local applicable regulations and
standards.
Maximum concentration level
The maximum charge of refrigerant and the calculation of the maxi-
mum 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 kg/m
3
kg of the refrigerant gas in 1m volume of the occupied space).
Compliance to the local applicable regulations and standards for the
maximum allowable concentration level is required.
In Japan the maximum allowed concentration level of refrigerant to a
humanly space for R410A is limited to 0.3 kg/m
English
• Check if the additional refrig-
erant charge has been fin-
ished correctly.
• Recalculate the required
amount of refrigerant from the
piping length and add an ade-
quate amount of refrigerant.
3
( the weight in
3
.
1
2
1. direction of the refrigerant flow
2. room where refrigerant leak has occurred (outflow of all
the refrigerant from the system)
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 (kg) charged to each system
separately.
amount of refriger- additional charging
+
ant in a single unit amount (amount of
system (amount of refrigerant added
refrigerant with locally in accordance
which the system with the length or
is charged before diameter of the refrig-
leaving the factory) erant piping)
Note
• Where a single refrigerant facility is divided into 2 entirely inde-
pendent refrigerant systems then use the amount of refrigerant
with which each separate system is charged.
2.
Calculate the smallest room volume (m
Incase like the following, calculate the volume of (A), (B) as a sin-
gle room or as the smallest room.
A.
Where there are no smaller room divisions
B.
Where there is a room division but there is an opening
between the rooms sufficiently large to permit a free flow of
air back and forth.
1. opening between rooms
2. partition
(Where there is an opening without a door or where there are
openings above and below the door which are each equivalent in
size to 0.15% or more of the floor area.)
3.
Calculating the refrigerant density using the results of the calcu-
lations in steps 1 and 2 above.
total volume of refrigerant in the
refrigerant system
3
size (m ) of smallest room in which
there is an indoor unit installed
If the result of the above calculation exceeds the maximum con-
centration level then make similar calculations for the second then
third smallest room and so until the result falls short of the maxi-
mum concentration.
4.
Dealing with the situations where the result exceeds the maxi-
mum concentration level.
Where the installation of a facility results in a concentration in
excess of the maximum concentration level then it will be neces-
sary to revise the system.
Please consult your Daikin supplier.
total amount
=
of refriger-
ant (kg) in
the system
3
)
1
2
≤
maximum concen-
3
tration level (kg/m )
16