Navien NPE-240A Service Manual

Version 2.21
122 NPE Service Manual
4. Replace the old fuse with the new part.
5. Ensure that the new fuse is of an equivalent rating and that it is
properly fixed inside the housing.
6. Close the fuse housing.
7. Turn on water supply, power supply, and gas supply to the
unit.
6.2.3 Fan Motor (Combustion Air)
1. Turn off the gas supply to the unit.
2. Disconnect the unit from the power supply.
3. Turn off the water supply to the unit.
4. Remove the mounting screw from the fan assembly as shown
in Figure 4 below.
5. Remove the fan assembly bracket with the attached intake
port.
Figure 4
7. Remove the old PCB and replace it with the new part.
8. Reattach all wiring connectors to the PCB.
9. Set the proper DIP S/W settings on the PCB (refer to page
90).
10. Reinstall the PCB using the 2 screws previously removed.
11. Turn on the water and gas supplies, then reconnect the power
supply to the unit.
NOTE
All wiring harness connections to the PCB should match in
color and pintypes. Do not use excessive force when removing
the connectors as this may cause damage to the PCB.
6.2.2 Fuse
1. Turn off the gas supply to the unit.
2. Disconnect the unit from the power supply.
3. Locate the fuse housing shown in Figure 3 below. Open the
housing to expose the fuse.
Figure 3

Navien NPE-240A Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Factor	0.97
Energy Efficiency	97%
Voltage	120V
Ignition Type	Electronic
Maximum Input	199, 900 BTU/h
Water Connection Size	3/4"
Gas Connection Size	3/4"
Warranty	15-year on heat exchangers, 5-year on parts, 1-year on labor
Dimensions	17.3" W x 13.2" D x 27.4" H