Observe the heat transfer oil level to see that it does not drop below the line stenciled on the tank head.
To add heat transfer oil to the system, connect the fill valve to a drum with a flexible hose or suitable
connection, with one end submerged to the bottom of a drum of heat transfer oil Close the pump valve
and open the fill valve at the same time. Leave the valves this way until the drum is empty, then close
the fill valve and open the pump valve to change drums. If the system is in operation, let the pump run,
but if the system is not in operation, turn the pump switch off while changing drums.
When adding heat transfer oil to a system from a drum, make sure that the drum has a second
opening for air to enter. If not, the drum can be collapsed by pump suction.
The valves on the external user should be operated as follows:
The supply valve should remain full open. You should throttle the return valve to control the temperature.
To reduce the temperature, throttle the valve to close, but never close completely. To raise the
temperature, open the valve. When the temperature is close to the desired amount, you should move
the valve handle approximately 1/2 turn at a time.
Allow approximately one half hour between adjustments to allow for heat balance.
If the stack of the heater should become smoky, this is caused either by not enough combustion air, or
too much fuel oil. In either case, there will not be a good heat release and heating will be poor. This
condition should be cleared up as soon as possible by either increasing the combustion air or limiting the
fuel oil going into the burner.
This section provides information useful in diagnosing and correcting unsatisfactory operation or failure
of the hot oil heater and its components. Each trouble symptom stated is followed by a list of probable
causes of trouble. The possible remedy recommended is stated and described opposite the probable