Fulton Vertical Tubeless (FT-A) Thermal Fluid (hot oil) Heater - Manual (Page 57)

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SECTION 3
FTA-IOM-2013-0227
OPERATION
3-17
4
WARNING
Non-Fulton product information is for
reference purposes only. No Fulton
document may substitute for full
review of documentation available
from the component manufacturer.
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.
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.
On/Off Controls
Typically one controller is provided to sense the temperature on the heater
outlet. This controls the operation of the heater by switching it on and off .
1. An adjustable two point diff erential between shut off and start up is
built into the controller. This prevents frequent cycling of the burner. The
controller is set to provide the desired outlet fl uid temperature. Due to the
temperature rise through the unit, this may be considerably higher than
the inlet temperature.
2. If the unit is equipped with an on/off controller, it will be located on the
face of the electrical cabinet. The temperature setpoint in the controller
can be adjusted following the manufacturer’s instructions.
Modulating Controls
All gas-fi red models may be equipped with modulating controls.
1. The modulating temperature controller continuously regulates the outlet
fl uid temperature between the minimum fi ring rate and high fi re. When
the unit is on low fi re and the temperature continues to climb past the
setpoint, the heater will shut down. It will typically re-start when the
process temperature drops 7 F below setpoint.
2. Minimum load depends on the degree of modulation provided. Typically
2:1 modulation is provided, depending on the fuel selection and heater
size. In this case minimum load is one half of full fi ring rate.
3. The modulating temperature controller is set to maintain the desired fl uid
outlet temperature. Due to the temperature rise across the heater, this may
be considerably higher than the inlet temperature.
4. If the unit is equipped with a modulating controller, it will be located on
the face of the electrical cabinet. The temperature setpoint in the controller
can be adjusted following the instructions in the component data sheet
section of this manual.
Pressure Gauges
All units have two pressure gauges measuring the thermal fl uid pressure at the
inlet of the heater and at the outlet of the heater. A third gauge measures the
pump suction pressure.