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This instructional manual is only intended for use by a qualified service professional or authorized Noritz
Service Representative. Any unauthorized use of this manual may result in voiding the warranty.
Please contact Noritz Technical Support (866-766-7489) for additional support.
SKJ70NL
Rev. 10/13
NR501, NR662 Series Heat Exchanger
Replacement
NR501-OD, NR662-OD
Noritz America Corporation
11160 Grace Avenue, Fountain Valley, CA 92708
Phone 866-766-7489 Fax 714-241-1196
Page 1
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Summary of Contents for Noritz NR501 Series
- Page 1 Model Include: NR501-OD, NR662-OD This instructional manual is only intended for use by a qualified service professional or authorized Noritz Service Representative. Any unauthorized use of this manual may result in voiding the warranty. Please contact Noritz Technical Support (866-766-7489) for additional support.
- Page 2 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram Remove the front cover (1) Disconnect electrical power to unit (2) Turn off gas and water (3) Remove 4 screws (4) Remove drain 2 valves and drain the unit completely (5) Remove the cover - circuit board Cover - Circuit Board Disconnect the connectors from the circuit board and remove the ground wire, and the circuit board...
- Page 3 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram Remove the manifold plate (1) Remove 3 big silver screws on the manifold plate that attach the manifold to the burner (2) Remove 2 smaller silver screws from the manifold plate that attach the manifold to the gas valve (3) Remove manifold plate and unplug the connector from gas solenoid valves (3) Disconnect pipes from the water flow sensor and the water...
- Page 4 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram Remove the heat exchanger from the case (1) Remove the 2 set screws on the bottom of the burner (2) Remove the 2 set screws on the top of the case (support bottom of the assembly) (3) Copper Heat Exchanger(CU HE), Burner, and Fan will come out in one section.
- Page 5 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram (4) Attach the thermal fuse and 6 clamps from 4 sides of Front side heat exchanger, See 4 views of the heat exchanger to make sure the thermal fuse is routed correctly The end of insulation tube(Black) and the clamp on the left are lined up Right side...
- Page 6 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram (5) Place the new freeze prevention heater with one that was shipped in the heat exchanger kit. Wrap the freeze prevention heater around outlet pipe from the CU HE as shown in diagrams (6) Make sure to route the wire as shown in the diagram (6) Outlet Pipe...
- Page 7 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram Reattach the burner and the CU HE (1) Attach 10 screws around perimeter of the burner and the CU HE Replace the assembly back inside the case (1) Secure the 2 set screws on the bottom of the burner (2) Secure the 2 set screws on the top of the case Reconnect water connections (1) Maintain the high limit switch, the thermistor - heat...
- Page 8 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram Replace the manifold plate (1) Plug the connector to gas solenoid valves (3) as right diagram (2) Confirm that there is o-ring before replace the manifold plate O & BL (3) Replace the 2 smaller silver screws from the manifold wire GY &...
- Page 9 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram Plug all wires that attach to the wiring harness and the body Thermistor - Air of the water heater (1) Plug all wires that attach to the wiring harness (2) Tie wires by cable tie as right diagram (3) Tie wires by cable tie as right diagram Thermistor - Hot Water Thermistor - Cold Water...
- Page 10 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram (6) Replace the circuit board; secure the screw on middle- upper of the circuit board. Secure the ground wire. (7) Reconnect the connectors to the circuit board (8) Plug the high limit switch and the thermistor - heat exchanger Plug the freeze prevention heater, the thermal fuse (2) and tie the wires by the cable tie...
- Page 11 NR501-OD, NR662-OD Series Heat Exchanger Replacement Procedure Procedure Diagram (11) Put all wires as the diagram NR501-OD NR662-OD (14) Replace the cover - circuit board Cover - Circuit Board Check for gas leaks and doing trial operation (1) Turn on gas (2) Turn on the unit.