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General| Type | Condensing Tankless Water Heater |
|---|---|
| Water Connection | 3/4" NPT |
| Ignition Type | Electronic |
| Fuel Type | Natural Gas or Propane |
| Energy Efficiency | 0.96 |
| Vent Type | 2" PVC/CPVC or Polypropylene |
| Temperature Range | 98°F - 140°F |
| Warranty | 15 years heat exchanger, 5 years parts |
Details coverage durations for heat exchanger and other parts.
Defines the start of warranty coverage based on purchase.
Specifies warranty terms for the heat exchanger component.
Outlines warranty for all parts except the heat exchanger.
Defines the applicability of the service manual to Navien CH Series.
Outlines rights, access, and reading requirements for the manual.
Explains the use of symbols for referring to sections.
Defines terms used in safety messages to avoid risks.
Explains symbols indicating hazards like DANGER, WARNING, CAUTION.
Details symbols like IMPORTANT and NOTE for specific information.
Alerts to risks of fire, explosion, or asphyxiation from improper venting.
Warns about scalding risk from high hot water temperatures.
Provides step-by-step instructions for actions if gas is smelled.
Lists general safety rules to follow before operating or servicing.
Outlines installation codes and standards that must be followed.
Advises checking gas type and AC voltage compatibility before servicing.
Warns against field conversion and voids warranty.
Describes the KD Navien condensing gas boiler features and models.
Identifies and lists the main components of the boiler with part numbers.
Lists key specifications like heat capacity, weight, dimensions, and pressure.
Provides detailed physical dimensions and connection sizes.
Illustrates water flow and system operation for heating and DHW modes.
Visualizes the sequence of operations and decision points in the boiler's system.
Details the functions and settings of the DIP switches for various modes.
Provides a visual representation of the electrical connections within the boiler.
Identifies specific points for electrical measurements and their normal values.
Describes the function, failure events, and diagnostics for the main control board.
Explains the transformer's role in supplying power to the unit.
Details the function of over-temperature and exhaust safety switches.
Describes thermistors used for measuring temperatures in the boiler.
Explains the function and troubleshooting for the combustion air fan motor.
Details the igniter and flame sensing component for ignition.
Describes the sensor that monitors air pressure for combustion.
Explains the component that distributes gas to the burners.
Details the valve controlling gas flow to the main burner.
Describes the pump that circulates water for heating or DHW.
Explains the valve that diverts water flow between heating and DHW.
Details the sensor that monitors water pressure in the system.
Describes the valve that maintains system water pressure.
Lists all error codes, their reasons, and self-diagnostic/action steps.
Covers errors 01E through 40E, detailing causes and fixes.
Guides on diagnosing issues based on observed symptoms like noise or no hot water.
Provides instructions on how to safely drain water from the boiler.
Details the procedure for cleaning the air intake filter.
Outlines general safety precautions and steps for replacing parts.
Step-by-step guide for replacing the Printed Circuit Board (PCB).
Instructions for safely replacing the internal fuse of the unit.
Guide for replacing the power transformer component.
Steps for removing and replacing the combustion air fan motor.
Instructions for replacing the flame rod and ignition electrode.
Guide for replacing the ignition transformer.
Steps for replacing the Air Pressure Sensor.
Instructions for disassembling and replacing the gas manifold.
Guide for replacing the main gas valve assembly.
Steps for replacing the Gas Pressure Sensor.
Instructions for replacing the condensation trap.
Guide for replacing the domestic hot water flow sensor.
Steps for removing and replacing the circulation pump.
Instructions for replacing the 3-way diverter valve.
Guide for replacing the water pressure sensor.
Instructions for cleaning or replacing the space heating strainer.
Steps for replacing the auto feeder valve.
Guide for replacing the DHW heat exchanger.
Instructions for replacing the DHW outlet collar.
Illustrates the steps for disassembling the boiler's outer casing.
Provides a diagram and steps for disassembling the burner assembly.
Shows a diagram of the water circuit components for disassembly.
Outlines recommended annual inspection and maintenance tasks.
Provides a template for recording inspection results.
Provides a template for recording maintenance activities.
