THERMOJET
®
G-3700E SERIES
OIL PURIFIER SYSTEM
INSTALLATION AND OPERATING MANUAL
Doc #
77740151
Rev
03
Date
June 2020
Page
68
of
111
Locate the thermocouple terminal enclosure for the T/C connected to the heater element.
Remove the terminal enclosure cover and find the terminal screws which connect the
thermocouple to the high alarm circuit. Disconnect the thermocouple and wire the thermocouple
simulator to the same screws. Take care to observe proper polarity for (+) and (-) terminations.
Restart the ThermoJet by turning the main disconnect to the ON position and then switching the
ON-OFF selector switch to the ON position. The unit will start and oil temperature will increase to
the normal operating temperature. Allow the machine to reach normal operating temperature.
Adjust the thermocouple simulator output so that the signal replicates an increasing temperature
T < 135°C (275°F) to T > 135°C (275°F). The high temperature cutout will disable the oil heater
and give a local annunciation as the temperature increases above 135°C ±2°C (275°F ±4°F). Oil
temperature will decrease.
NOTICE:
The Heater High Temperature alarms are designed to
disable the oil heater as temperature increase above 135°C
±2°C (275°F ±4°F). High temperature cutout set point is
non-adjustable.
Oil temperature begins
to decrease once the
temperature exceeds
the cutout set point
High temperature pilot
light (RED) illuminates
once the temperature
exceeds the cutout set
point
