mcr S-THERM smoke exhaust vents: C, E, NG-A. OPERATION AND MAINTENANCE MANUAL
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8.4.
Mechanic control
The mechanic control system consists of a lock and oleopneumatic actuators (gas springs) connected
by a lever to the traverse in the base and to the leaf.
There are 3 types of lock:
1)
Standard (without electromagnet).
2)
With electromagnet releasing in response to electrical impulse (current flow).
3)
With electromagnet releasing in response to power failure.
Fig. 63 shows the lock in the standard version (a) and with the electromagnet version (b).
a)
Standard lock
b)
Electromagnet lock
Fig. 62 Types of locks for mechanic controls.
The standard and electromagnetic locks can be easily distinguished by the presence (for
electromagnetic lock) or absence (for standard lock) of housing. On the other hand, the type of
lock with an electromagnet can be determined by the power of the electromagnet:
1)
Power 3.5 W - electromagnet releasing in response to electric impulse (current flow)
2)
Power 1.6 W - electromagnet releasing in response to power failure
Read the electromagnet power from the rating sticker.
8.4.1.
Methods of opening the lock
A vent with mechanic control system can be opened in 3 different ways, depending on the order:
1)
Automatically, when the flux melts.
2)
By opening the electromagnet.
3)
By hand, with a rope.
The above opening methods are shown in Fig 64.
