Fulton Vertical Tubeless (FT-A) Thermal Fluid (hot oil) Heater - Manual (Page 54)

© The Fulton Companies 2013
OPERATION
FTA-IOM-2013-0227
SECTION 3
3-14
4
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.
Non-Fulton product information is for
reference purposes only. No Fulton
document may substitute for full
review of documentation available
from the component manufacturer.
NOTE: The diff erential pressure will vary with heater model.
2. The heater is dependent on proper fl ow for operation; therefore, a
diff erential pressure switch is used to sense the pressure drop across the
heater. The diff erential pressure switch will shut the unit down in the event
of loss of fl ow.
3. The diff erential pressure switch can be tested while only the pump is
running at operating temperature. Remove the metal cover on top of the
switch and increase the setpoint until the pump shuts down. This value
should be greater than the DP of the gauges. Next, decrease the setpoint
back to its initial value and depress the pump start button to verify the
pump will re-start.
High and Low Fluid Pressure Switches
The heater is equipped with a low inlet and high outlet pressure switch. See
Figure 5. 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.
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.
TO TEST THE SWITCHES
1. With the three position switch set to “Pump”, remove the cover from the
pressure switch and manually trip the switch. Pump should shut down.
2. Repeat for each switch; replace covers. Note, if the burner was on, it would
also stop.
3. To set the inlet 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 inlet pressure
gauge.
4. 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.
5. With the unit running at operating temperature, lower the high outlet
pressure switch until the pump shuts down. Note the setpoint and raise
by 10 psi, then restart the pump. The setpoint of this switch should
correspond to the outlet pressure gauge reading.
NOTE: Switch settings shall never exceed the safety valve set pressure.