Fulton Alliance (FT-HC) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 57)

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SECTION 3
FTHC-IOM-2012-1001
OPERATION
3-21
!
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.
 Diff erential Pressure Switch
The diff erential pressure switch (Figure 18) 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.
FIGURE 18 - DIFFERENTIAL PRESSURE SWITCH