Fulton Vertical Coil (FT-C_S) Thermal Fluid (hot oil) Heater - Manual (Page 50)

© The Fulton Companies 2013
3-10
OPERATION
FTCS-IOM-2013-1114
SECTION 3
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
Should overheating occur or the gas
supply fails to shut off , manually shut
off the gas supply external to the
equipment .
providing post-purge of the combustion chamber.
5. The fl ame is monitored by a fl ame sensor. In the event of insuffi cient,
unstable, or non existent pilot or main fl ame, the fl ame sensor will cause a
safety lockout of the fl ame programmer. Safety lockout can also be caused if
the fl ame 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.
 SEQUENCE OF OPERATION 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 fl ame 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
energized and a timed trial for pilot ignition begins. After the pilot fl ame is
proven, the main fuel valve is energized. Ignition is turned off when fl ame
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 fl ame is
proven, the spark is shut off .
5. When the fl uid 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.
 MODULATING BURNER
The function of the fl ame programmer must be greatly extended in a modulated
system. Along with limit controls, operating controls and interlock devices, the
programmer automatically controls the operation of the burner, blower motor,
ignition, main fuel valves and modulating motor (or servo motors).
The sequence of operation is as follows:
1. Beginning with power on, limit switch closed, fuel valves closed, and
modulating limit controller closed and calling for heat, the fl ame programmer
begins its cycle and the blower motor starts prepurge. The modulating circuit
closes, driving the air dampers to maximum for prepurge.
2. The air fl ow proving switch must be closed now. After timed prepurge, the
modulating motor (servo motor) drives the air damper to its low fi re position.
All start interlocks must be proven or the fl ame programmer will lockout.
3. (Units with Gas Pilot) Ignition and pilot are energized and a timed trial for
pilot ignition begins. After the pilot fl ame is proven, ignition turns off and the
main fuel valve is energized. Pilot fuel is turned off and the modulating motor