FULTON FT-0080C, Инструкция по установке, эксплуатации, обслуживанию и каталог запасных частей

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FT-C Vertical Electric Thermal Fluid Heater Manual 12 2013 ISSUE 1
Page 40
3
3.6.6
SEQUENCE OF OPERATION
Before firing the heater familiarise yourself on the use of the controls, lighting, and shutdown
procedures.
For Gas Fired Burners
The burner is of forced design. The sequence of operation is as follows:
1) The flame programmer opens the main gas valve once stable pilot flame is established.
2) Pressure regulators on both the pilot and main gas supply, supply pressure to the proper level.
Note: Note the maximum inlet pressure rating of each regulator and supply a step-down regulator if required.
3) Combustion air is delivered by a centrifugal blower fan. An air switch monitors the pressure and
is part of the flame programmer safety interlock circuit.
4) The flame programmer monitors the safe operation of the burner. Functions include pre-purge
of the combustion chamber, provision of ignition via the ignition transformer and electrode,
opening the pilot gas valve, monitoring the pilot flame signal via the flame sensor, opening main
gas valves and providing post-purge of the combustion chamber.
The flame is monitored by a flame sensor. In the event of insufficient, unstable, or non
existent pilot or main flame, the flame sensor will cause a safety lockout of the flame
programmer. Safety lockout can also be caused if the flame sensor is improperly positioned or
grounded. After fault has been corrected, reset by pressing the reset button on the casing of the
burner control box.
For On/Off Burner
The sequence of operation for the on/off burner is as follows:
1) Beginning with power on, limit switch closed, fuel valves closed, and temperature controller
calling for heat, the flame programmer starts the cycle and the blower motor starts prepurge.
2) The air proving switch must be closed now. Air dampers remain in maximum position.
3) (Gas Pilot) Provided all safety interlocks are proven, ignition and pilot are energised and a
timed trial for pilot ignition begins. After the pilot flame is proven, the main fuel valve is
energised. Ignition is turned off when flame is registered and the main gas valves open.
4) (Spark Ignition) At the end of purge time, provided all safety interlocks are proven, the spark is
on and oil valves are opened. When the flame is proven, the spark is shut off.
5) When the fluid temperature reaches the off setting (typically the setpoint plus 2 to 5 degrees) of
the operating temperature controller, all fuel valves are closed.
The burner motor stops and the entire system is ready for restart on demand.