ignition interlock override devices
Commercial and institutional Make Up Air Units
Tenderall Fan Co offers different types of industrial Make-Up Air Systems for larger industrial plants ventilation. An improvement in the industrial plants on the environment can have significant benefits in terms of more production, fewer errors and a decrease in complaints and absenteeism among employees.
Air Handling Units for the Make-Up Air and Space Pressurization applications have the following characteristics:
- Outlet temperature usually checked with a probe mounted near the outlet of the unit.
- Discharge air temperature is set at the control panel or using a remote station.
- Gas input is "modulated" by a butterfly valve, actuator and controller.
Applications for space is a room thermostat used for outlet temperature. On a call for heat, the unit providing air heated to the maximum temperature until the room thermostat is satisfied. Once satisfied, The device will either disable or will continue at a reduced temperature exhaust.
An override option can also be supplied. In this case, a room thermostat is supplied In addition to the basic system. The unit is set to full-fire at room temperature is too low.
Direct Spark ignition units are supplied with a transformer the igniter.
Pilot units are supplied with an automatic pilot operated solenoid valve pressure regulator and a small - about 20,000 BTU - like an ignition transformer the pilot with electric igniter.
Pre-treatment of the system (by starting the blower for a certain time to a minimum air volume change) to provide inflammation of the main burner is not required by ANSI code, but is often determined by the user. This should be provided when a building containing combustible dust or fumes which would can achieve and collect in a gas-fired unit while it is active.
To assure safe operation of a gas fired heating, a number of Security are usually provided:
A. Damper Limit Switch - Dampers should be fully open before unit will operate.
B. Air Proving Switch - Located near outlet unit of the airflow to prove before igniting burner.
C. Flame Supervision - discussed above. Closed unit on flame failure.
D. High Temperature Limit - Signals unit to reduce gas when the maximum allowable temperature is reached. If the air temperature limit, the device off.
E. High Gas Pressure Switch - Closes unit to protect against spikes in the inlet gas pressure regulator.
F. low gas pressure switch - Closes unit at low inlet pressure discovered. Redundant safety device, because small flash unit would be closed.
G. Safety valve - Responds to various inputs above - Exit gas.
Gas-fired Air Heating Systems are a class of devices used primarily in industrial and commercial environments to ensure worker comfort. To a lesser extent, these systems are used to the air for process and finishing applications such as paint drying and curing equipment.
Additional information can be found on the Tenderall Fan company website http://www.tenderall.com/ahu/index.html.
Oleg Chetchel
Commercial Air Handling Systems Engineer
Fan Tenderall Co
http://www.tenderall.com/contact/index.html
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