HOT OIL HEATER
Section A. GENERAL
a. These Instructions are published for the use of the personnel to whom the Volcanic Hot Oil Heater,
200STM77, is issued. Chapters 1 through 5 provide information on the operation, maintenance
accessories, components and attachments This manual provides descriptions of the main units and their functions in
relationship to other components.
This manual covers only the Volcanic Model 200STM77 Hot Oil Heater.
2. Theory of Operation
a. The Volcanic Model 200STM77 Hot Oil Heater is designed to handle heat transfer liquid. Its coil design
permits full control over temperature and flow of heat transfer liquid to external users.
b. Outlet fluid temperature is controlled by an Indicating temperature control which has its capillary element
mounted in a well in the heater outlet header pipe. This instrument is set for on-off operation.
c. A high temperature limit control also has Its element Installed in the heater outlet header pipe When this limit
control is activated, It will shut down the burner.
d. A low level control Is mounted in the rear of the expansion tank. The liquid fluid level must be above this float
control for operation of Hot Oil Heater
e. A pressuretrol is Installed with piping connections to the heater outlet header pipe This switch insures that the
pump pressure is adequate during operation and that the liquid is flowing through the heater coil
f. The flame program control provides for automatic Ignition, firing operation, and flame failure alarm of the Hot
Oil Heater burner In conjunction with the limits, operating controls and interlocking devices, the flame program control
programs the burner-blower motor, Ignition transformer, and the fuel valves.
g. The circulating pump provides the capacity and pressure to circulate the heat transfer liquid through the
heater coil and external user. The circulating pump motor is activated by push buttons In the starter cover plate. This
pump must be started before the firing sequence can begin.