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General| Gas Connection | 3/4" NPT |
|---|---|
| Water Connection | 3/4" NPT |
| Type | Condensing Tankless |
| Fuel Type | Natural Gas or Propane |
| Voltage | 120V |
| Temperature Range | 98°F - 140°F |
| Vent Diameter | 3" PVC/CPVC |
| Warranty | 15 years heat exchanger, 5 years parts |
Definitions of hazard terms used in the manual.
Explains hazard symbols like DANGER, WARNING, CAUTION.
Explains symbols for IMPORTANT and NOTE.
General safety guidelines for operation and environment.
Overview of the Navien condensing gas boiler features and models.
Identifies and lists major internal components with part numbers.
Provides key technical specifications for different models.
Shows physical dimensions and connection diameters.
Illustrates water flow for heating and DHW modes.
Visualizes the boiler's operational sequence and logic.
Details the function and configuration of DIP switches.
Provides a detailed electrical wiring schematic.
Identifies key test points for electrical troubleshooting.
Describes the Printed Circuit Board (PCB) function and failure.
Explains the function and specifications of the transformer.
Details the function of limit switches for overheat protection.
Explains the function and types of thermistors used.
Describes the fan motor's role in combustion air supply.
Details the flame rod's function in ignition and flame detection.
Explains the ignition transformer's role in spark generation.
Describes the Air Pressure Sensor's function in air supply control.
Explains the manifold's role in gas distribution to the burner.
Details the main gas valve's function in controlling gas flow.
Explains the Gas Pressure Sensor's role in combustion control.
Describes the burner assembly and its function in combustion.
Explains the flow sensor's function in steady hot water temperature.
Details the primary heat exchanger's role in heat transfer.
Explains the secondary heat exchanger's function in heat transfer.
Describes the DHW heat exchanger's role in hot water generation.
Explains the circulation pump's function in water circulation.
Details the 3-way valve's function in switching between heating and DHW.
Explains the water pressure sensor's role in system operation.
Describes the auto feeder valve's function in maintaining water pressure.
Comprehensive list of error codes and their reasons.
Troubleshooting steps for 'Boiling' error.
Troubleshooting steps for 'Ignition failure'.
Troubleshooting steps for 'False-flame detection'.
Troubleshooting steps for 'Disconnection of supply temperature sensor'.
Troubleshooting steps for 'Shortcircuit of heating temperature sensor'.
Troubleshooting steps for 'Hot Water Outlet thermistor open error'.
Troubleshooting steps for 'Hot Water outlet thermistor short'.
Troubleshooting steps for 'Fan Motor RPM error'.
Troubleshooting steps for 'Air pressure Sensor error'.
Troubleshooting steps for 'Water pressure sensor error'.
Troubleshooting steps for 'Flame loss'.
Troubleshooting steps for 'PCB error'.
Troubleshooting steps for 'High Limit Switch Cut-off'.
Troubleshooting steps for 'Space heating return thermistor open'.
Troubleshooting steps for 'Short circuit of space heating return thermistor'.
Troubleshooting steps for 'Cold water inlet thermistor open'.
Troubleshooting steps for 'Shortcircuit of cold water inlet thermistor'.
Troubleshooting steps for 'Abnormal air pressure sensor error'.
Troubleshooting steps for 'Leakage'.
Troubleshooting steps for 'Exhaust high limit error'.
Troubleshooting steps for 'Gas pressure sensor error'.
Troubleshooting steps for 'Communication error'.
Troubleshooting steps for 'Flow sensor error'.
Troubleshooting steps for 'Short circuit of outdoor temperature sensor'.
Guides troubleshooting based on symptoms like noise or hot water issues.
Lists precautions and tools for boiler inspection.
Procedures for checking and adjusting gas pressure.
Steps for draining water from the unit.
Instructions for cleaning the air filter.
General safety and procedural guidelines for part replacement.
Detailed steps for replacing individual components.
Steps for disassembling the boiler's outer casing.
Diagram and list for burner assembly parts.
Diagram and list for water pathway components.
Recommended annual inspection and maintenance tasks.
A template for recording inspection findings.
A template for recording maintenance performed.
