The Hastings `ELECTROFLO features the package concept in electric heating units. A UL listed electric heater is incorporated into a factory assembled, wired and tested heating system. Three temperature control sequences are available to meet the requirements of most heating  applications:

APPLICATION AND OPERATING  SEQUENCE

SBEH - SPACE HEATING (100% RETURN AIR)

The SBEH unit is designed for 100% return air room heating applications with the air temperature being controlled from the heated space. The SBEH operating sequence is not recommended for ventilating applications.

The "On" position of the "On-Off-Auto" blower switch provides continuous blower operation. The "Auto" position allows blower operation whenever the room thermostat calls for heat. With the " Summer-Off-Winter" season switch in the "Winter" position, the room thermostat stages the electric heater to maintain the desired space air temperature.

With the "Summer-Off-Winter" season switch in the "Summer" position, electric heater is de-energized and blower operates to provide recirculated air.

SBEM - MAKE - UP AIR (100% OUTSIDE AIR)

The SBEM  make-up air unit is designed to replace exhausted building air with 100% outside air to prevent the many problems of "air starvation."  This replacement air is heated when the outside air temperature is below the desired discharge air conditions.

The "On" position of the "On-Off" blower switch provides continuous blower operations. With the "Summer-Off-Winter" season switch in the "Winter" position, the discharge air temperature controller stages the electric heater to maintain   desired leaving air temperature.

With the "Summer-Off-Winter" season switch in the "Summer" position, the electric heater is de-energized and blower operates to provides  summer ventililation. 

SBEV - HEATING & VENTILATING (MIXED OR 100% OUTSIDE AIR)

The SBEV combines the control of both make-up air and space air temperature. This sequence is equally effective for up to 100% of either outside or return air heating and ventilating applications, or 100% outside air only.

The "On" position of the "On-Off-Auto" blower switch provides continuous blower operation. The "Auto" position allows blower operation whenever the room thermostat calls for heat.

With the "Summer-Off-Winter" season switch in the "Winter" position, the electric heater is staged by either the room thermostat or the discharge air controller. Hearing is controlled by the room thermostat. If discharge temperature falls below the setting of the discharge air controller, the room thermostat is over-ridden and heating output is increased until discharge air controller is satisfied.

With the "Summer-Off-Winter" season switch in the "Summer" position, the electric heater is de-energized and blower operates to provide summer ventilation.