mcr S-THERM smoke exhaust vents: C, E, NG-A. OPERATION AND MAINTENANCE MANUAL
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Fig. 54 PUAV pneumatic actuator - lock release direction.
Pneumatic actuators for smoke exhaust purposes are equipped with an internal lock which prevents
closing of the fully opened vent leaf. Method of closing the vent leaves after an alarm opening for
systems without remote closing function:
- Release the CO
2
from the system by unscrewing the cartridge from the thermal fuse or alarm box
(note: there is high pressure in the system - unscrew slowly; note: the cartridge may give a frostbite).
- Release the actuator locks (5) by lifting them in the direction of the actuator movement
(in accordance with the arrow on Fig. 54).
- Lower the vent leaf.
- Confirm the leaf is closed.
- Insert a new CO
2
cartridge in the thermal fuse or alarm box.
- If necessary, replace the thermal fuse (alcohol ampoule (2)).
8.2.
Electric control
The leaf opening control system using a 24 V= electric actuator for smoke exhaust is delivered ready
for installation in the vent. Adaptation to operation consists in hanging the catch plates of the traverse
on the frame and connecting them with a set of self-drilling screws to the base. The coupling of the
actuator to the leaf consists of connecting the eyebolt of the electric actuator to the pin of the hook
console and adjusting it appropriately so that the console snaps securely onto the T-bolt, while at the
same time the electric actuator is turned off when the vent is closed by a limit switch rather than an
overload switch.
Connection of Gxx (mcr-W) / SGxx (mcr-WSG) actuator (polarity of conductors):
brown cable +
b brown cable -
blue cable -
blublue cable +
For controlling and supplying electric actuators Gxx (mcr W) / SGxx (mcr WSG) of
mcr S-THERM vents, smoke exhaust and ventilation control units mcr 9705, mcr 0204 and extension
modules mcr R0424 and/or mcr R0448 should be used.
It is recommended that the vent leaf opening for ventilation with a 24 V actuator does not exceed
30°, which corresponds to an opening time of approx. 20 seconds.
8.3.
Ventilation function
The ventilation function can be implemented in 2 primary ways:
using pneumatic actuators with an appropriate installation,
using an additional electric actuator supplied with 230 V~ (see figure below).
5
spindle retracts
spindle extends
