THERMOJET
®
H-2500E SERIES
OIL PURIFIER SYSTEM
INSTALLATION AND OPERATING MANUAL
Doc #
77740119
Rev
15
Date
June 2020
Page
34
of
100
Should the vessel surface thermocouple output reach the high temperature alarm/heater cutout setting,
power to the oil heater element is interrupted. When this happens the oil temperature as indicated on the
heater controller display will begin to decrease. As the oil temperature falls below oil heater controller
setting, the heater controller will sense the decreasing oil temperature and attempt to energize the heater.
However the high limit controller will prohibit the oil heater from energizing and oil temperature will
continue to fall. The Heater On pilot light will be illuminated because the heater controller is providing an
ON signal to the heater power control relay.
NOTICE:
When a Heater High Temperature alarm occurs the red
press-to-test pilot light will illuminate. The alarm pilot light
will remain illuminated and the oil heater will not be
operable until the press-to-test Heater High Temperature
reset button is depressed. Press to resume heater
operation.
