Fulton Vertical Electric (FT-N) Thermal Fluid (hot oil) Heater - Manual (Page 58)

Fulton Thermal Corp.*Electric Thermal Fluid Heaters Manual* Version 2010-0423
Page 58
h) Operating Limit Controller
1. 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 can be adjusted following instructions in the component
data sheet section of this manual.
i) Pressure Gauges
1. All units have two pressure gauges measuring the thermal fluid pressure
at the inlet of the heater and at the outlet of the heater. The difference
between the readings of the two gauges indicates the pressure loss
across the heater. The difference must not fall below the recommended
value. Recommendations are based on heater size and are listed in
Section Two.
2. The gauge indicating the pressure of the fluid at the inlet is labeled
“Inlet“. The “Outlet” gauge indicates the pressure at the outlet, and in
effect indicates the resistance of the external pipework circuit. The
pressure gauge indicating pressure at the inlet of the pump is labeled
“Suction .”
j) Flow Proving Device
1. The heater is dependent on proper flow for operation; therefore, three
pressure switches and a differential pressure switch are used to sense
flow across the heater. Any one of these switches will shut the unit down
in the event of loss of flow.
15. Daily Start-Up
a) Check positioning of all system valves to ensure flow is not dead-headed.
b) Visually check relative position of minimum level float switch in the combination tank.
c) Turn on power supply switches.
d) Where applicable, open water cooling valve and check that water flows correctly. (For
water cooled pumps only.)
e) Open fuel valves.
f) Set three position switch to “Pump”. Push and hold manual pump start button, monitoring
pressure gauges on heater.
g) Push reset on high fluid pressure switch located on the side of the control panel. Release
pump start switch. Pump should continue to run.
h) When ready to begin heating, move three position switch from “Pump” to “Heat”. After a
short delay resulting from the purge period, the burner will ignite. Make sure that the
temperature setpoint is as desired.
i) On gas units, pilot valve activation will be indicated after pre-purge cycle has completed,
followed by main flame activation. Check the presence of the flame by observing flame