FDB2 FIRE AND GAS DAMPER - Halton

FDB2 Installation, operation and
maintenance instructions
Version: 10
Date: 19.12.2012
2. OPERATION INSTRUCTIONS FOR ELECTRICAL DAMPERS
2.1. GENERAL
Electrical dampers can be fitted with many different types of electrical actuators that operate the damper
blades. Electrical actuators usually include internal open/closed limit switches that can be used to detect the
position of the damper from remote systems.
The voltage and current required for each damper depends on the type of actuator.
2.2. ELECTRICAL CONTROL SYSTEM
Supply voltage depending on the actuator type is supplied to the junction box. This is connected via a micro
switch/ fusible link assembly to the drive Actuator. This supply voltage provides the motive force to open the
damper blade in which position it will remain as long as the supply voltage is maintained.
Isolation of the Actuator from the supply voltage allow the spring-return forces in the Actuator to rotate it back
through 90 degrees to the damper “closed” position. This is the basis of the “fail safe closed” mode of control.
The movement of the damper blades is accomplished with a rotary, single-acting, spring-return Actuator,
which is directly attached to one of the blade drive shafts. The other blades are connected to the driven shaft
by means of a linkage mechanism. The damper open and closed conditions are selected by energizing or deenergizing
the control voltage supply.
The damper can be controlled from remote systems simply by turning the supply power on and off. Local
control and monitoring can be achieved with FD-CON-2 accessory control boxes. Multitude of different
additional limit switches and other components can be installed to the damper according to order
specification.
2.2.1. Normal operation
A) To select damper ‘OPEN’ energize control voltage supply. Supply voltage will then pass via the micro
switch /fusible link assembly into the damper Actuator hence opening the damper.
B) To select damper ‘CLOSED’ de-energize the control voltage supply. The spring return Actuator closes
the damper.
2.2.2. Automatic damper closing
The damper will automatically ‘CLOSE’ if the temperature of the air within the damper duct exceeds 50
(option 74, 100) degrees centigrade thus breaking the fusible link which allows the micro switch to go into
the “closed” position thus de-energies the spring return Actuator.
2.3. MANUAL OVERRIDE
Manual override functions for electrical dampers are always a special solution and depends heavily on the
type of actuator used. If the manual override function is required in the order specification then a separate
detailed manual will be supplied for this operation.
Main sales office & factory
Tel. +358 (0)2079 2200
Fax. +358 (0)2079 22060
http://www.haltonmarine.com
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