Fulton Hopkins (HPN) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 52)

© Fulton Companies 2014
OPERATION
HPN-IOM-2014-0416
SECTION 3
3-20
!
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.
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.
 Pump Motor Starter
If a pump starter is supplied the pump motor starter will be located in the heater
panel or pump skid. When the pump start button is pushed, the pump motor
starter will engage the pump.
1. While fi ring, actuate the manual trip button on the pump motor starter.
2. Pump and burner will shut down.
3. The blower should continue to run for approximately 30 seconds.
4. Attempt to restart pump by depressing the pump start push button.
5. The pump should not start. Reset starter and start pump.
 Diff erential Pressure Switch
The diff erential pressure switch (Figure 13) is mounted to the heater panel.
Sensing lines connect this switch to both the inlet and outlet manifold of the
heater. This switch is critical and ensures proper fl ow through the heater at all
times.
1. Proper setpoint is 2 psi below the published diff erential pressure of the
heater.
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. Remove the metal cover on top of the switch and increase the
setpoint until the pump shuts down. 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
Multiple coil fl ow heaters are equipped with a low inlet, high inlet and high outlet
pressure switch (Figure 13). 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.