NTI INSTALLATION MANUALS

Part 14 - Maintenance

Cleaning the CH and DHW Inlet Filters 1. Remove the clip and remove the CH lter. 2. Clean the lter with a toothbrush and clean running water. 3. Reinstall the CH Filter.

DANGER

Failure to replace a damaged sealing ring will result in exhaust gas leaks, substantial property damage, severe personal injury, or death. 4. Replace all damaged seals that are damaged or showing signs of wear. 5. Proceed in the reverse order to reinstall the components. Replacing the Fan 1. Remove the silencer and gas line as described in Cleaning the Heat Exchanger Combustion Chamber. 2. Loosen the three [3] screws to release the Mixer (1) from the fan (5). Ensure the O-Ring (4) is not damaged or deteriorating.

Figure 112 - Removing the Fan

DHW Filter

Figure 111 - Removing the DHW Filter

4. Remove the DHW ow switch to have access to the DHW inlet lter. Remove the clip and pull the ow switch assembly upward. 5. Clean the lter with a toothbrush and clean running water. 6. Reinstall the DHW inlet lter. 7. Re ll the DHW circuit following the lling and purging instructions in this manual. 8. Re ll the CH circuit following the lling and purging instructions in this manual. Restore gas and power to the boiler. D. Replacing Components At any point in time over the boiler’s service life it may be necessary to replace boiler components. If the boiler displays an error message, determine its cause and possible remedies. If the remedy is replacement of a component, ensure: 1. That the boiler is powered OFF. Press the ON/OFF button to turn the boiler o . Then turn the main electrical power to the boiler o at the circuit breaker. 2. The boiler electrical connection is connected properly. A loose electrical connection could the root cause of problems. 3. The front cover has been removed. 4. The main shuto gas valve is closed. 5. All water valves to and from the boiler (supply, return, inlet, outlet) are closed. 6. If necessary, the water has been drained from the boiler and/or appropriate circuit. 7. No water can get into the display / control panel. Replacing the Burner 1. Remove the front cover and pivot the electronic housing following the instructions described in Removing the Cabinet Cover and Inspecting the Boiler. 2. Remove the combustion assembly as described in Cleaning the Heat Exchanger Combustion Chamber. 3. Remove, inspect, and replace the burner as described in Checking the Burner.

1 2 3

4 5

6

Figure 113 - Removed Fan, Bi-Venturi, and Components

Legend: 1 - Mixer (when converting to Propane, install the Mixer included in the Natural Gas to Propane Conversion Kit) 2 - Gas Diaphragm if applicable (Models converted to Propane require a Gas Diaphragm - see Natural Gas to Propane Conversion Instructions)

3 - Gas Seal 4 - O-Ring 5 - Fan 6 - Fan to Air Inlet Channel Gasket

3. Inspect the fan to air inlet channel gasket. Ensure it is not damaged or deteriorating.

DANGER

Ensure that the correct gas diaphragm and mixer are used for the correct fuel type for the boiler - Natural Gas or Propane. See Conversion Kit Instructions. Failure to do so will result in substantial property damage, severe personal injury, or death.

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