User guide

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3-21
SECTION 3 FTCS-IOM-2013-1114 OPERATION
! 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 quali 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.
of loss of  ow.
3. The di 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, high inlet and high outlet pressure
switch. See Figure 6. 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  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  uid system is the pressure required
to maintain the proper  ow. Pressure changes are monitored with these
switches, which will shut the unit down in case of a change in the  uid  ow.
 TO TEST THE SWITCHES
1. With 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  uid pressure cutout switch, raise the setpoint with
the  uid at operating temperature and pump running, until the pump
shuts down. Note the setpoint and lower by 10 PSI, then restart pump. The
setpoint at cutout should correspond to the reading on the inlet pressure
gauge.
FIGURE 24  HIGH/LOW GAS PRESSURE SWITCH