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Warns about dangers of hot water and scald risks.
Steps for gas leaks: evacuate, ventilate, contact authorities.
Emphasizes installation and service by qualified personnel only.
Instructions for handling appliances submerged in water.
Safe handling of flammables, maintenance, and intended use.
Explains symbols used in the manual for safety and information.
Details the warranty coverage for the appliance.
Identifies and labels the primary parts of the heater using a diagram.
Covers pre-installation, user instructions, clearances, and location choice.
Details supply/return piping, radiant heating, multi-zone systems, and water/glycol connections.
Covers gas supply, operating at altitudes, and electrical connections.
Explains vent system types, installation, and condensation removal.
Shows water connection kits, diagrams, and system layouts.
Important safety and procedural guidelines for all maintenance tasks.
Detailed steps for cleaning the burner and flue-gas side of the heat exchanger.
Procedures for draining heating/domestic sides, checking flame, safety valves, flue system, and materials.
What to do for gas leaks, water leaks, malfunctions, overheating, and routine maintenance.
Explains the instrument panel, ignition procedure, summer/winter operation modes.
Covers resetting ignition module, low water cut-off, high-limit thermostat, and pressure gauge.
Discusses circulator pump, gas valve switch, shut-off procedures, freezing precautions, and flue gas discharge.
Step-by-step guide for diagnosing and resolving burner ignition issues.
Troubleshooting sequence for issues related to heating calls.
Troubleshooting sequence for issues related to domestic hot water calls.
Lists part numbers for AXIA 20E and AXIA 29E models.
Provides specifications for heating/output ratings, pressures, temperatures, and dimensions.
Graphical representation of residual head, burner pressure, and efficiency vs. input rating.
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