Daikin SV1A25AJV1B - Natural Ventilation

13 | Special requirements for R32 units
Installer and user reference guide
50
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
When the R32 sensor in the SV unit detects a refrigerant leak, the SVS output will
close and activate the alarm. An error message will display on the remote
controllers of the connected indoor units. See "21Troubleshooting"[4118].
Field settings
External alarm
Code Description Value
[2-0]
(a)
Cluster indication 0 (default): disable
[2-4]
(b)
Safety measures 1 (default): enable
[2-7]
(b)
Ventilated enclosure 0: disable
(a)
Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b)
Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "17.1Making field settings"[4100].
SV unit test run
Before SV unit operation, it is required to perform a test run that simulates a
refrigerant leak. See "18.3SV unit test run"[4110] for more details.
13.4.3 Natural ventilation
Natural ventilation is a safety measure where ventilation is made to a place where
sufficient air is available to dilute the leaked refrigerant such as a large space.
The duct connection must be replaced with the duct closing plate accessory (see
"14.5.2To install the duct closing plate"[473]).
The natural ventilation safety measure can be applied by following the steps
below:
Step1 – Determine total room area, which is the total area of the space that has
natural ventilation and the space in which the SV unit is installed:
The respective room area can be determined by projecting the walls, doors and
partitions to the floor and calculating the enclosed area. Spaces connected only
through false ceilings, ductwork, or similar connections are not considered a single
space.
Step 2 – Use the graph or table below to determine the total refrigerant charge
limit in the system:
Note: Round down the derived values.
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
50 25 30 35 40 45 50 55 60 65201510 70 75 80
m [kg]
A
1
+ A
min
[m
2
]
A
1
+ A
min
[m²] m [kg]
20 6.7
30 10.1
40
0 0
10 3.3
13.5
50 16.8
60 20.2
70 23.6
80 27.0
90 30.3
100 33.7
110 37.1
120 40.5
130 43.9
140 47.2
150 50.6
160 54.0
170 57.4
180 60.7
190 64.1
200 67.5
210 70.9
220 74.2
230 77.6
236 79.6
237 79.8
240 79.8
250 79.8
m Total refrigerant charge in the system [kg]
A
1
Area of the room with natural ventilation [m²]
A
min
Minimum room area of the space in which the SV unit is installed [m²]