Operation, Operating limit controller – Fulton Hopkins (HPN) Horizontal Coil Thermal Fluid (hot oil) Heater User Manual
Page 55
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SECTION 3
HPN-IOM-2014-0416
OPERATION
3-23
!
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.
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 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 restart 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.
.
Operating Limit Controller
The limit controller is mounted in the panel box door. This limit controller senses
temperature in the outlet manifold. The temperature setpoint in the controller
may be adjusted per manufacturer’s instructions.
FIGURE 14 - HIGH/LOW GAS PRESSURE SWITCH