Fulton Vertical Coil (FT-C_S) Thermal Fluid (hot oil) Heater - Manual (Page 63)

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3-23
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 qualifi ed to
operate/maintain the equipment.
temperature, note that the temperatures quoted are the actual limit to
which any of the fl uids may be subjected. It is important to remember that
in any fi red heater there exists a “fi lm” temperature which is higher than the
temperature of the bulk of the fl uid. Temperature controllers measure the
bulk temperature and not the fi lm temperature. This must be taken into
consideration when setting the temperature controls.
3. Approximate guidelines for temperature settings are not to override the
system design parameters.
4. These instructions should be used in conjunction with information from
the system designer. Consult manufacturer’s literature.
5. Standard primary temperature control sensing point location for On/Off
and Modulating heaters is on the heater outlet. For systems with multiple
heaters manifolded together, the sensing point is on the heater inlet.
6. When optional inlet location of the primary controls is specifi ed, the
following instructions may still be used with some modifi cation. For
instance when primary controls are located on the inlet, the dead band
range will be much narrower than on heaters with outlet control. In
addition, temperature changes will not be as immediately apparent.
7. An indicating temperature controller is used to regulate the thermal fl uid
temperature. Typically the indicating control is a thermocouple.
8. The thermocouple is directly immersed in the thermal fl uid in the heater
manifold. The setpoint of the controller is regulated by the keypad.
 High Temperature Limit Switches Safety
All units are fi tted with high temperature limit controllers which monitor the fl uid
temperature at the heater outlet. This limit controller provides over temperature
protection. A high temperature limit switch acts as an over temperature safety
device.
1. If the high temperature limit shuts down the unit, the manual reset button
on the limit switch must be pressed after determining and resolving issue.
The red button on the fl ame programmer (or door reset) must also be
pressed to reset the unit before it can be restarted.
2. The high temperature limit controller is factory set to 0 F. This must be set
to the lowest of the following:
» Maximum operating temperature of the fl uid.
» Maximum operating temperature of the equipment.
» 15°F (9°C) over maximum system operating temperature.
3. Do not set this controller too close to the normal outlet temperature in
order to avoid nuisance lockouts due to small transient over temperatures.
4. Several consecutive lockouts caused by the high temperature limit
controller indicate the need for immediate installation review.