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General| Brand | A.O. Smith |
|---|---|
| Model | Master-Fit 100 Series |
| Category | Water Heater |
| Language | English |
Defines the required qualifications for personnel servicing the water heater.
Critical safety warning regarding unqualified service personnel and manual instructions.
Emphasizes thorough inspection of wiring and connectors for proper troubleshooting.
Details the gas supply pressure and electrical specifications for the water heaters.
Specifies the required minimum and maximum gas supply pressures for proper operation.
Guidelines for setting gas pressures in installations with multiple appliances.
Discusses stoichiometric air needs and recommends excess air for combustion.
Explains how lack of air can cause downdrafts and affect appliance operation.
Describes requirements for direct communication with outdoors for combustion air.
Warns about corrosive vapors in combustion air and their effects on the unit.
Discusses how devices like pressure reducers create closed water systems.
Explains thermal expansion in closed systems and potential warranty implications.
Specifies the required power supply voltage, frequency, and grounding.
Provides a table detailing minimum clearances for right side, left side, back, and ceiling.
Identifies components like Low Gas Pressure Switch and Supply Gas Inlet.
Shows the Main Gas Regulator, Manifold Pressure Tap, and Top Knob.
Details the Manifold Gas Outlet and Main Valve Solenoid connections.
Classifies water heaters as Category I, non-condensing, negative pressure venting appliances.
States approval for Type B vent and confirms the draft inducer does not pressurize exhaust.
Provides guidelines for common venting of multiple heaters using tapered or constant manifolds.
Venting sizing tables for specific models based on input, rise, and vent height.
Venting sizing tables for additional models based on input, rise, and vent height.
Lists specific pressure settings for various BTN and BTR models to close the switch.
Identifies key components like the integrated heater control and ignition control board.
Details display LEDs, temperature adjustment dial, and reset functions.
Labels terminals for low gas switch, flame probe, inducer, and gas valve connections.
Shows the main burner, HSI, rollout shield, and radiation shield.
Describes the step-by-step sequence for igniter warm-up, gas valve opening, and flame sensing.
Visualizes the heater's operating sequence, including checks and lockout conditions.
Interprets diagnostic LED flash codes for the heater control board.
Lists flash codes for the ignition control board and their corresponding indications.
Covers polarity check, high limit continuity, and temperature probe continuity checks.
Tests for no inducer, no ignition, igniter heat without burner, and short ignition.
Checks for shutoff below setting by testing water temperature probe continuity.
Explains the meaning of display LEDs (Power, Call for Heat, ECO, Reset Status).
Provides a detailed wiring diagram showing connections between major components.
