Fulton Alliance (FT-HC) Horizontal Coil Thermal Fluid (hot oil) Heater - Manual (Page 61)

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SECTION 3
FTHC-IOM-2012-1001
OPERATION
3-25
!
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.
 Modulating Controls
All coil models are standard-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
3:1 or 5:1 modulation is provided. In this case minimum load is one third 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.
1. The diff erence between the readings of the two gauges indicates the
pressure loss across the heater. The diff erence must not fall below the
recommended value. Recommendations are based on heater size and are
listed in manual and on the product data submittals on www.fulton.com.
2. The gauge indicating the pressure of the fl uid at the inlet is labeled “Inlet“.
The “Outlet” gauge indicates the pressure at the outlet, and in eff ect
indicates the resistance of the external pipework circuit. The pressure
gauge indicating pressure at the inlet of the pump is labeled “Suction.”