THERMOJET
®
H-2500E SERIES
OIL PURIFIER SYSTEM
INSTALLATION AND OPERATING MANUAL
Doc #
77740119
Rev
15
Date
June 2020
Page
32
of
100
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 135 PSI (9.3
BAR). 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 180
o
F (82
o
C) 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 glass window into the controller
enclosure so as to prevent damage to any flame
proof joint between the enclosure and the treaded
cover. Flameproof joints are not to be repaired in
the field. If the flame path 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
Oil heater
Pressure switch provides
permissive interlock with the
oil heater
