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AEC/Appllcatlon Engineering
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Maintains a constant flow of fluid through the heater tank to prevent damage to the heating
elements and fluid
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Factory pre-set to maintain the system pressure specified by the customer- must not be
tampered with in any way
Pressure Switch
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Built into each unit
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Guards against heater damage
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Prevents the heater elements from being energized unless the pump is running and fluid is
in the system
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Factory set; no field adjustments needed - must not be tampered with
Safety Thermostat
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Protects against thermal runaway
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Shuts down the heater outputs, sounds the audible alarm, and lights the alarm indicator if an
over temperature condition exists
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Pump continues to run, pumping fluid through the system to prevent heater damage
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Automatic reset design resets the thermostat as the unit cools
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All heater controller functions lock out until you reset main power
Note:
Always have a qualified maintenance technician determine and correct the cause of an
over temperature fault before you resume operation
Electrical Components
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NEMA 1 standard electrical enclosure
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IEC motor starters
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Full unit fusing - pump motor, heater, primary side transformer
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High temperature heater cutout
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High temperature audible and visual alarm, activated by the safety thermostat
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Pressure switch shuts down heater for low pressure
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Mercury heater contactors
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Pump motor and immersion heater operate on three-phase, 50/60 cycle nominal voltage
with control circuit at I l 5V single phase
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Single phase machine tool transformer with primary fuse protection and grounded
secondary supplies control circuit voltage
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Electrical panel complies with NEC provisions
TOH True Temp,... Serles Hot 011 Temperature Control Units
Page 11
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