Operation and Maintenance Manual
– SCD Smoke Dampers
Version 1
Date 04 2018
Page 44 of 81
To prevent this phenomenon cylinders with CO2 are mounted with the outlet at the
bottom. Then, when the cylinder has been perforated, the gas pressure forces liquid gas
through the valve to the pneumatic system made of tubes. In the system the liquid gas
phase is quickly heated by the environmental heat and it becomes gas, without the risk of
freezing.
The cylinders of different sizes are available:
Size
(CO
2
[g] content)
Dimensions [mm]
Nominal
temperature
[°C]
Charging efficiency
(density) [g/ml]
20
26 x 115
93
0.54
24
26 x 115
68
0.65
38
30 x 144
93
0.58
40
30 x 144
68
0.62
55
35 x 159
93
0.58
75
30 x 205
50
0.74
80
35 x 217
93
0.57
120
50 x 178
93
0.56
150
50 x 178
68
0.70
300
50 x 315
50
0.71
500
60 x 342
50
0.75
750
60 x 490
50
0.71
1000
80 x 382
50
0.71
1500
80 x 525
50
0.75
5.1.6. AK ALARM BOXES
AKs are one of the main elements of the smoke damper control system. They make it
possible to release gas energy in order to open a damper, in the following scenarios:
1. Manual release
– by pushing the black push button,
2. Electric release
– by applying nominal voltage to the electromagnet (with HEA and
HEPA option only),
3. Pneumatic release
– by applying pneumatic triggering agent (e.g. CO2) to the PA
connection (with HEA/HEPA option only).
