Related Manuals for A.O. Smith BTH 199
Summarization of Contents
Installation
Exterior Clearances
Details required clearances for horizontal and direct vent installations for BTH units.
Minimum Air for Combustion
Explains the minimum air requirements for combustion per BTUH input.
Make-Up Air Requirements
Covers make-up air for direct communication, vertical, and horizontal ducts.
Contaminated Air and Flammable Items
Discusses the impact of air quality and hazards of flammable materials near the unit.
Venting and Gas Supply
Supply Gas Pressure
Details on checking supply gas pressure at the gas valve.
Manifold Gas Pressure
Explains how to measure manifold gas pressure at the gas valve.
BTH Sequence of Operation
Pressure Switch Information
Provides details on pressure switch operation and ratings.
Cyclone BTH Normal Indications and Readings
BTH Display Board Indications
Details on control panel and display board indicators during operation.
Troubleshooting
Pre-Service Tips
Essential checks and conditions to verify before troubleshooting.
Continuity Checks
Guidance on performing continuity tests on various components.
Igniter Continuity Check
Step-by-step procedure for checking igniter continuity.
Valve Coil Continuity Check
Procedure for checking the continuity of the gas valve coil.
Control Board Check
Steps to verify 120 VAC supply to the control board.
Transformer Test
Procedure for testing the 120 VAC to 24 VAC transformer.
24 VAC Checks
Testing for 24 VAC from the transformer and control board.
24 VAC Thru ECO Test
Test for 24 VAC through the Energy Cutoff (ECO) switch.
Temperature Thermistor Check
Procedure to check the resistance of temperature thermistors.
Blower Speed Test
Checking for 120 VAC supply to the blower motor.
Blower Speed Reduction Test
Testing the blower speed reduction board for BTH 250 models.
Continuity Pressure Switch Test
Checking continuity of each pressure switch terminal to terminal.
24 VAC Check Through Pressure Switches
Verifying 24 VAC flow through pressure switches.
Voltage Test to Igniter
Testing for 120 VAC to the igniter on 250 models.
Gas Pressure Tests
Includes supply gas pressure and manifold gas pressure tests.
Component Part Information
Gas Valves and Orifice Table
Lists gas valve models, voltages, and orifice sizes for different BTH models.
BTH Error Codes
Common Error Codes
Lists common error codes and their potential causes and solutions.
Other Service Hints
Provides additional service tips for condensation and noise issues.
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