Operation and Maintenance Manual
– SCD Smoke Dampers
Version 1
Date 04 2018
Page 43 of 81
5.1.4. THERMAL FUSES
In TAVE and TAVZ thermal trips, only G5-RWA-xx thermal fuses, which were tested
with the trips, can be used
Rys. 21. Thermal fuses.
G5-RWA
Colour of a thermal fuse defines the limit temperature:
G5-RWA-68, G8-RWA-68
red
68
°C
G5-RWA-93,
green
93
°C
G5-RWA-141, G8-RWA-141
blue
141
°C
Note:
The nominal temperature of a thermal trip ampoule shall always be lower (or equal
to) than the nominal temperature of the CO
2
cylinder.
5.1.5. CO
2
CYLINDERS (CARTRIDGES)
Cylinders with compressed CO
2
are the source of energy for the basic function of the
smoke dampers with a pneumatic drive. They are equipped with safety valves. The
connection thread is ½" UNF (extra-fine).
Note: CO
2
is always released from a
cylinder in the liquid state!
Rys. 22. CO
2
cartridges
When a cylinder with CO2 has been punctured, the gas rapidly expands and stays
cool at the same time. It may result in liquid CO2 freezing inside the cylinder. In this state
the gas cannot go out of the tank, so there will be not enough gas in the pneumatic system.