THERMOJET
®
G-3700E SERIES
OIL PURIFIER SYSTEM
INSTALLATION AND OPERATING MANUAL
Doc #
77740151
Rev
03
Date
June 2020
Page
37
of
111
Should the heater element or 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
pilot light will illuminate. The alarm pilot light will remain
illuminated and the oil heater will not be operable until the
Heater High Temperature reset button is depressed. Press
the reset push button to resume heater operation.
