A.O. Smith 100 Series, Service Handbook

Page: 35 / 80

35
Servicing should only be performed by a Qualified Service Agent
ADJUSTMENT
There must be sufficient load to operate the boiler/water heater at high fire to perform the following adjustments. Start the boiler/water
heater and observe proper operating parameters for the system.
Required Tools:
• TORX
®
T40 or 5 mm hex wrench
• 3 mm or 7/64 inch hex wrench
• Combustion analyzer
These boilers/water heaters are equipped with a Honeywell combined gas/air control and gas safety shut off control valves. The
valve functions in parallel with the variable speed combustion blower to supply the correct gas air ratio for optimum performance and
efficiency. The combustion blower speed is controlled automatically and determines the amount of negative pressure experienced
by the gas safety shut off/control valves. The gas/air regulator adjusts gas flow to maintain the proper pressure at the outlet nozzle
of the associated valve.
SETTING OF THE TEST MODE
On the Burner Home screen, select any individual boiler/water heater which will guide to Burner Information screen.
Click on Operation button, and under the Modulation Menu, set the required Firing rate (High/Low) by setting the RPM.
On the Firing Rate page, set the Firing rate RPM by selecting the Manual in Run check box.
FIGURE 22. BURNER HOME SCREEN FIGURE 23. BURNER INFORMATION SCREEN