THERMOJET
®
G-3700E SERIES
OIL PURIFIER SYSTEM
INSTALLATION AND OPERATING MANUAL
Doc #
77740151
Rev
03
Date
June 2020
Page
35
of
111
Heater Operation:
The electric heater will not energize until flow is established and all the air escapes from the
heater tube and the oil pressure builds. This ensures that the heater does not energize before it is
immersed in oil. A pressure switch connected to the oil supply tubing downstream of the heater.
The pressure switch provides a permissive start interlock and allows the heater to energize once
the oil pressure reaches 9.3 BAR (135 PSIG). This may be noted on the inlet pump discharge
and filter discharge pressure gauges as well as by the amber HEATER ON indicator light.
At initial start-up the red Heater High Temperature alarm pilot light and the yellow Heater ON will
be illuminated. Press the Heater High Temperature Alarm reset button to reset the high
temperature alarm and turn the Heater High Temperature alarm pilot light OFF. The yellow
Heater On pilot light will remain ON until the oil temperature approaches the normal operating
temperature set by the temperature controller.
The temperature controller is factory set at 82
o
C (180
o
F) and is field adjustable. The
temperature controller is accessed by unscrewing the glass window from the explosion proof
electrical enclosure.
Care should be taken when removing and
reinstalling the controller enclosure so prevent
damage to any flame proof joint, such as between
the enclosure and the treaded cover. Flameproof
joints are not to be repaired in the field. If the
flamepath is damaged the enclosure is to be
removed from service and replaced with a new
properly working enclosure.
Amber HEATER ON pilot
light illuminates when heater
is energized
Pump and filter discharge
pressure gauges indicates
system pressure
Pressure switch provides
permissive interlock with the
oil heater
Oil heater
