Operation and Maintenance Manual
– SCD Smoke Dampers
Version 1
Date 04 2018
Page 39 of 81
PxxV and DxxV series pneumatic actuators are maintenance-free, because their
design ensures constant lubrication. However the piston rod and actuator locks should be
cleaned regularly and lubricated with widely available silicone-free greases. In the case of
actuators operating in such an environment as the landfarm, food industry, galvanising
plants, chemical industry, swimming pools, SPA etc., it is recommended to use water
separators, preferably just before control valves, and the condensate drain in a
compressed air tank. Alternatively an air dehumidifier can be used.
After the actuator has been installed, but before it is ON, check the following items:
•
That the actuator cylinder can move freely in the BG scissor mechanism.
•
That, at full stroke actuation, the damper leaf does not hit any elements.
•
That, at the maximum load and maximum vacuum, there is no excessive
deformation of the leaf or mechanism.
•
Final locking position (if present).
•
That the piston rod and unlocking screws are free of rust.
•
That the piston is not damaged.
•
That the atmosphere the pneumatic actuator is installed in is not corrosive.
There is an open position lock in the pneumatic actuator.
In order to close the “A” type damper after emergency opening carry out the following
operations:
1. Unscrew the cartridge from the TAVE thermal trip or AK alarm box. CO2 will flow
out from the system. NOTE: When the cartridge is unscrewed, the cylinder gets
suddenly cold.
2. Unlock the actuator by moving the locking pins away (see Fig. 18).
3. Carefully close the damper leaf.
4. Set the thermal trip according to the instruction given on page 32.
5. Check if the leaf is closed.
6. Install a new CO2 cartridge in the thermal trip or alarm box.
7. Replace the thermal fuse.
Maintenance actions:
Only trained employees may perform maintenance of the actuators and CO
2
system. The
maintenance shall be carried out at least once a year.
The following elements must be checked:
•
The unlocking screws for traces of rust.
•
The state of the unlocking screws sealing ring for abrasion and damage, as well
as sealing of the housing.
•
The piston rod for traces of rust, damage and dirt (clean if necessary).
•
Piston rod gaskets (wipers) for dirt and wear and tear in terms of the piston road
sealing.
•
The tightness of all components (it is necessary to check the actuator tightness in
every compression position and in the outermost positions
– open and closed).
•
Air dustiness.
5.1.3. THERMAL TRIP
In the thermal trip, when the thermal fuse has been triggered at the given limit temperature,
CO2 is released from its cylinder and flows to the actuator, causing the damper to open.
The thermal fuse reacts at the specific nominal temperature, with -3
°C / +8 °C tolerance.
Components:
•
Thermal fuse (ampoule)
•
Cylinder with CO2
•
Pin
