OPERATION AND MAINTENANCE MANUAL mcr LAM vents
Page 13 of 20
The following two types of pneumatic actuators area used:
1. Powered by CO
2
(smoke exhaust) or by compressed air (natural ventilation)
– for
opening and closing. Types of control: C1
– only opening (closing vents by hand), C2
– opening and closing.
2. Powered by CO
2
(smoke exhaust) or by compressed air (natural ventilation)
– for
opening only, closed manually from the roof level or by a gas spring (automatic). Types
of control: c#.
The pneumatic actuator for smoke exhaust features integral locks, which prevent opening
of the louver blades when the vent is idle or closing them when it has been opened in the
emergency mode (to extract smoke).
Closing of pneumatically operated vents after emergency opening
– for systems without
remote closing function:
1. Release CO
2
: unscrew the bottle from the thermal release valve or alarm box (Warning
1: high pressure! unscrew slowly! Warning 2: the CO
2
bottle may frost over).
2. Release the actuator locks (5) by lifting them in the motion direction of the actuator
(shown by arrow in Figure 14 Pneumatic actuator
– lock release direction).
3. Tilt down the louver blades.
4. Check closing status.
5. Fit a new CO
2
bottle in the thermal release valve or in the alarm box.
6. The thermal fuse (thermo bulb) should be replaced if needed (2).
Closing of vents fitted with a pneumatic actuator and a gas spring after emergency opening
– for systems without remote closing function:
1. Release CO
2
: unscrew the bottle from the thermal release valve or alarm box (Warning
1: high pressure! unscrew slowly! Warning 2: the CO
2
bottle may frost over).
2. Move the ventilation box valve lever to the vent opening position.
3. After ca. 5 sec. move the ventilation box valve lever to the vent closing position.
4. Fit a new CO
2
bottle in the thermal release valve or in the alarm box.
5. The thermo bulb (alcohol filled glass bulb) should be replaced if needed (2).
9.2
Electric control
9.2.1. Louvered smoke vents
The vent opening/ closing system, based on 24 V DC electric actuator, used for smoke
exhaust, is pre-installed at the factory. This control system is called E1.
Wiring diagram of MCR-W actuator (polarity of conductors):
Brown +
Rod is withdrawn
(vent closes)
Brown
–
Rod is extended
(vent opens)
Blue
–
Blue +
MCR9705, MCR0204 smoke exhaust and daily ventilation control units with MCRR0424
and/or MCRR0448 extension modules are used to supply electricity and control the MCR-W
actuators fitted in mcr LAM louvered vents.
9.2.2. Louvres for daily ventilation
The vent opening/ closing system, based on 230 V AC electric actuator, used for daily
ventilation, is pre-installed at the factory. The control system is called E2.
