FT-C Vertical Electric Thermal Fluid Heater Manual 12 2013 ISSUE 1
The differential pressure switch is mounted to the heater.
Sensing lines connect this switch to both the inlet and outlet manifold of the heater. This switch is
critical and ensures proper ow through the heater at all times.
1. Proper setpoint is 0.14 barg below the published differential pressure of the heater.
The differential pressure will vary with heater model.
2. The heater is dependent on proper ow for operation; therefore, a differential pressure switch
is used to sense the pressure drop across the heater. The differential pressure switch will
shut the unit down in the event of loss of ow.
3. The differential 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.
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 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 secods.
4. Attempt to restart pump by depressing the pump start push button.
5. The pump should not start. Reset starter and start pump.
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