A.O. Smith fps50, FPSE50, FPS40, FPS 75 manual Air For Combustion

FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK

AIR FOR COMBUSTION

Checking for On initial start up, check for the correct draft on the Power Shot. To check the

Draftdraft, place a smoke stick directly in front of the inlet air damper while the heater is firing. A properly operating system will draw the smoke into the inlet air damper as shown in the right illustration. The illustration on the left shows a negative

To check for a negative condition close all windows, outside doors, and fireplace dampers. Turn on all exhausting appliances, including kitchen draft hoods, clothes dryers, furnaces, bathroom vents, etc. Open all inner doors between these appliances and the Power Shot.

Once all appliances are on and inner doors open, open the inlet air damper on the Power Shot when the heater is not firing. Using your hand, check for air movement. If air is being blown back into the room, a negative pressure condition exists.