Fulton Vertical Tubeless (FT-A) Thermal Fluid (hot oil) Heater - Manual (Page 19)

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SECTION 2
FTA-IOM-2013-0227
INSTALLATION
2-13
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
contacts air.
Oxidation of the fl uid will also occur when hot thermal fl uid contacts air at a leak
in the system piping. Oxidized thermal fl uid becomes acidic and will damage the
thermal fl uid system. Thermal fl uid breakdown can occur in sections of piping
where there is a low fl ow condition. A low fl ow rate through the heater will result
in high fi lm temperatures leading to breakdown of the thermal fl uid.
THERMAL FLUID BREAKDOWN PREVENTION
Multiple pressure switches and a diff erential pressure switch are used to
prevent this condition from occurring. See Figure 5. These safeties must
not be bypassed at any time.
Exceeding the maximum operating temperature of the thermal fl uid will
also result in thermal fl uid breakdown. Fulton heaters are equipped with a
temperature limit switch (located on the front of the panel box) to prevent
this from occurring.
A high temperature limit switch is an over temperature safety device.
If the high temperature limit shuts down the unit, the manual reset
button on the limit switch must be pressed. The reset button on the
fl ame programmer must also be pressed to reset the unit before it can be
restarted. See Figure 6. Refer to Maintenance section of this manual for
troubleshooting activities.
FIGURE 5 - PRESSURE SWITCHES