mcr S-THERM smoke exhaust vents: C, E, NG-A. OPERATION AND MAINTENANCE MANUAL
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8.
CONTROL
The operation of smoke and combined smoke exhaust and ventilation vents is based on devices used
to open and close them. These devices constitute the control system for smoke exhaust or smoke
exhaust and ventilation. The smoke ventilation control system, depending on the type of
devices used in it, can be made as:
• pneumatic,
• electric,
• mechanic.
Depending on the control method, mcr S-THERM vents are equipped with pneumatic actuators
with thermal fuses or electric actuators and additionally with electric actuators to control gravitational
ventilation.
If the control fails and the vent leaf cannot be closed, contact the service department immediately (see
chap. 11.
If the leaf has to be closed immediately: disconnect the immobilised actuator from the leaf (e.g. by
removing the eyebolt from the hook console or removing the eyebolt from the actuator, or
disconnecting actuator E from the mounting console), then close the leaf and secure it against opening.
8.1.
Pneumatic control
Depending on the system configuration, additional pneumatic tubing may need to be connected to the
vent (e.g. copper/steel tubing to the alarm box with cartridges).
Threaded connections of screw connections with valves, actuators, etc., are sealed with suitable
chemicals, e.g. Loctite 243 (recommended) or Teflon tape, by wrapping it around the thread. For
Loctite 243, apply several (2-3) drops of Loctite 243 to the thread to be sealed. Once the threaded
connection has been screwed together, Loctite 243 sets, sealing the joint and preventing uncontrolled
loosening (important for actuator connections). The unscrewing of such a secured screw connection is
only possible with hand tools.
