Controls
Heatec thermal fluid and process heaters automatically maintain the operating temperature set by the operator. Accuracy is within a half percent of the set temperature. They maintain thermal fluid temperature at the heater's outlet up to 750 degrees F (depending on variables).

HCI thermal fluid and process heaters have numerous safety features to ensure they always operate within prescribed limits. They will shut down automatically if an abnormal operating condition develops.

Limit switches and sensors ensure proper operation. They monitor the burner flame, thermal fluid temperature, exhaust gas temperature, flow of thermal fluid, fuel, and combustion air pressures.

Flame Monitor
The heart of the heater control system is a flame monitor with an ultraviolet scanner. It employs solid-state electronics for reliability and long life.

The flame monitor senses the burner main flame and pilot. It purges the firing chamber before firing. It turns on the pilot for a pre-programmed period and allows the main fuel valve to open only when safe. It shuts off fuel if a flame is not present.

Fuels
The heaters operate on natural gas, LPG, or commercial grade fuel oils, depending on the burner used. An optional combination burner allows switching between two different fuels.

Burner Controls
Modulating burner controls provide suitable turndown ratios. Full modulation allows the firing rate to closely match the heat demand. This conserves fuel, reduces temperature overshooting and eliminates constant on-off recycling.

Things that enhance value

• No blending of fluid from separate coils to achieve set temperatures.

• Pipe connection is provided for hookup of inert gas to snuff burner flame.

• Bolt-on nozzle covers permit replacement of helical coil without flame-cutting.

• Plated bolts and assembly hardware to resist rust and corrosion.

• Documentation furnished includes heater general arrangement, control wiring, piping and instrumentation, expansion tank arrangement, pump package arrangement, and component list.

• Electrical and electromechanical checkout before shipment.