FT-C Vertical Electric Thermal Fluid Heater Manual 12 2013 ISSUE 1
a)
1. Any obstruction downstream of the ow switch(es) will increase the pressure that the
heater outlet sees. Any increase in outlet pressure will result in diminished ow. This
obstruction will generally result from an improper valve setting.
2. Observe heater outlet pressure at temperature with all users / heat exchangers calling
for heat (100% user). Observe heater outlet pressure at temperature with all users / heat
exchangers not calling for heat (100% bypass).
3. Bypass regulating valve(s) should be adjusted to equal ow condition through users. Call
or e-mail Fulton for further details.
4. It may be possible that an automatic control valve has failed. If this is the case, the valve
should be replaced.
b)
1. A plugged strainer will result in a decrease in ow through the heater. High vacuums
developed from plugged strainers can also stress the seals of the pump causing the
pump to fail.
2. A "Pump Suction" gauge is provided on Fulton Thermal skids to help determine when a
strainer needs cleaning. Generally this point is between 0 and -0.17 barg.
3. If the strainer is plugged, isolate the strainer and drain being mindful of the temperature
of the thermal uid. Remove the strainer and clean with compressed air, high-pressure
water or a cleaning solution. Replace and observe new heater inlet pressure.
c)
1. A failed coupling will result in a decreased or no ow condition through the heater. The
coupling can be checked by removing the coupling guard between the pump and pump
motor. The coupling should not be torn or misshapen. If the coupling needs to be
replaced, it will be necessary to re-align the circulating pump rst at ambient temperature
and again when it's at operating temperature.
d)
1. Cavitation occurs when a partial vacuum presents itself at the eye of the pump impeller
due to loss of head or if any low heater ashes to gas at the impeller. During this time, the
pump impeller spins without actually circulating any thermal uid.
2. If Fulton Ltd provided the heater skid, loss of head to the pump is extremely unlikely with
proper uid level in the tank. The most common low heater in a thermal piping system is
water, which needs to be boiled out at startup.
3. Once the system has been brought up to full operating temperature, assuming that the
entire system has seen ow, there should be no further occurrence of low heater
contamination apart from heat exchanger failure.
e)
1. The Differential Pressure Switch should be set at operating temperature. The setting
should be 0.14 barg below the minimum differential pressure for that particular heater
model number.
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