Fulton Alliance (FT-HC) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 58)

© The Fulton Companies 2012
OPERATION
FTHC-IOM-2012-1001
SECTION 3
3-22
!
WARNING
Do not operate, or allow others
to operate, service or repair this
equipment unless you (they) fully
understand all applicable sections
of this manual and are qualifi ed to
operate/maintain the equipment.
Non-Fulton product information is for
reference purposes only. No Fulton
document may substitute for full
review of documentation available
from the component manufacturer.
 High and Low Fluid Pressure Switches
The heater is equipped with a low inlet, high inlet and high outlet pressure switch.
The switches are located on the side of heater panel with tubing connections
to the respective heater inlet and outlet manifolds. The switches are used to
ensure proper fl ow through the heater (no restrictions in the piping system). The
switches must be set at startup and the setpoints are based on the system design/
performance.
1. The only pressure required in the thermal fl uid system is the pressure required
to maintain the proper fl ow. Pressure changes are monitored with these
switches, which will shut the unit down in case of a change in the fl uid fl ow.
2. With three position switch set to “Pump”, remove the cover from the pressure
switch and manually activate. Pump should shut down.
3. Repeat for each switch; replace covers. Note, if the burner was on, it would
also stop.
4. To set the low fl uid pressure cutout switch, raise the setpoint with the fl uid at
operating temperature and pump running, until the pump shuts down. Note
the setpoint and lower by 10 PSI, then re-start pump. The setpoint at cutout
should correspond to the reading on the output pressure gauge.
5. With the unit cold and pump running, lower the high fl uid pressure cutout
switch until the pump shuts down. Note the setpoint and raise by 10 PSI, then
re-start pump. The setpoint at cutout should correspond to the inlet gauge
reading.
 Gas Pressure Switch
NOTE:

Gas Fired Units Only
The high and low gas pressure switches are located on the gas train. See Figure
19. 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.
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 and open the upstream manual valve.
11. The unit will start purge and fi re.