Fulton Vertical Tubeless (FT-A) Thermal Fluid (hot oil) Heater - Manual (Page 55)

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SECTION 3
FTA-IOM-2013-0227
OPERATION
3-15
4
WARNING
Non-Fulton product information is for
reference purposes only. No Fulton
document may substitute for full
review of documentation available
from the component manufacturer.
Gas Pressure Switch
NOTE: Gas Fired Units Only
The high and low gas pressure switches are located on the gas train See Figure
20. The switches are used to ensure that the incoming gas pressure and gas
pressure to the burner are within the appropriate range.
1. While fi ring, shut the main gas ball valve closest to the burner.
2. Unit will lock out on high gas pressure.
3. Attempt restart by resetting fl ame programmer.
4. Unit will start purge and lock out.
5. Open the gas valve closest to the burner and reset fl ame programmer.
6. Reset high side of switch, unit will start purge and fi re.
7. To test the low gas pressure switch, close the incoming manual valve.
8. Allow the control to sequence.
9. When the gas valves energize, the heater should lock out.
10. Reset the low side of the switch/reset fl ame programmer and open the
upstream manual valve.
11. The unit will start purge and fi re.
Operating Temperature Controls
The operating temperature control (Yokagawa, Honeywell) is located in the
heater panel and regulate the cycling of the heater.
FIGURE 20 - HIGH/LOW GAS PRESSURE SWITCH