FT-C Vertical Electric Thermal Fluid Heater Manual 12 2013 ISSUE 1
n)
1. The High Outlet Pressure Switch should be set at 0.35 barg over the maximum pressure
read on the heater outlet pressure gauge during proper operation at the coldest ambient
temperature expected.
p)
1. If the pressure is veried and reads correctly below the set point on the switch and the
sensing line to the pressure switch is open, the pressure switch is faulty. Replace the
switch, set for the desired set point and test for proper operation.
q)
1. The High Inlet Pressure Switch is a normally closed switch that opens with improper
heater inlet pressure.
2. The purpose of the High Inlet Pressure Switch is to protect the heater from building too
high of a pressure.
3. Typical electric heaters have a maximum working pressure of 10.34 barg with 6.9 barg
safety valve(s) on the heater outlet manifold. The High Outlet Pressure Switch should be
set at 0.35 barg over the heater outlet pressure as read at ambient temperature assuming
that none of the conditions mentioned below are true.
a)
1. Any obstruction downstream of the heater will increase the pressure that the heater outlet
sees. This obstruction will generally result from an improper valve setting.
2. Observe the heater outlet pressure at temperature with all users / heat exchangers calling
for heat (100% user). Observe the 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. The High Inlet Pressure Switch should be set at ambient temperature. The setting should
be 0.35 barg higher than the maximum pressure read on the heater outlet pressure
gauge during proper operation.
c)
1. The Differential Pressure Switch is a normally open diaphragm switch that closes with a
proper heater differential pressure between the heater inlet and outlet.
2. The purpose of the Differential Pressure Switch is to protect the heater from too high of a
temperature and to protect the thermal uid from exceeding its maximum lm
temperature. Each heater model number has a specic minimum differential pressure.
3. See if you do not know this pressure. This pressure is the difference in
pressure between the heater inlet pressure gauge and the heater outlet pressure gauge.
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