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NR50, NR66 and NR71 Series Heat Exchanger
Models Include:
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.
Replacement
NR50-OD
N-0531S, N-0531S-OD, NR66-SV, NR66-OD
N-0631S, N-0631S-OD, NR71-SV, NR71-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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Table of Contents
Related Manuals for Noritz NR50 Series
Summary of Contents for Noritz NR50 Series
- Page 1 N-0531S, N-0531S-OD, NR66-SV, NR66-OD N-0631S, N-0631S-OD, NR71-SV, NR71-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 NR50, NR66, and NR71 Heat Exchanger Replacement Procedure Procedure Diagram 1. Remove front cover (1) Disconnect electrical power to unit (2) Turn off gas and water (3) Remove 4 screws (4) Remove filter and drain unit completely 2. Remove circuit board (1) Remove 1 screw that holds the circuit board and let it hang outside of the unit...
- Page 3 Procedure Diagram 5. Remove fan (1) Remove the 2 screw on both sides of the fan, screws are located on back side of the case (2) When the screws are remove the back side of the fan with drop down and fan will rotate out 6.
- Page 4 Procedure Diagram 9. Remove heat exchanger components from old heat exchanger and put on new heat exchanger (1) Freeze prevention heater (front) (2) Freeze prevention sensor (left side) (3) High limit switch (right side) (4) Thermal fuse and fasteners from 4 sides of heat exchanger, See the 4 views of the heat exchanger to make sure the thermal fuse is routed...
- Page 5 Procedure Diagram 10. Place new O-Rings on new heat exchanger (1) Cold Water Pipe (smaller of 2 o-rings) (2) Hot water Pipe 11. Replace burner gasket (1) Remove old gasket (2) Replace with new gasket 12. Reattach burner and heat exchanger assembly (1) 10 screws around perimeter of burner 13.
- Page 6 Procedure Diagram 15. Replace Fan (1) Located metal tab on top of fan and use slot on burner to guide fan in place (2) Tighten 2 screws on both sides of the fan towards the back of case 16. Replace manifold plate (1) Secure the 3 smaller gold screw from the manifold plate that attach the manifold to the gas valve (do not fully...
- Page 7 Procedure Diagram 18. Check for water leaks (1) Replace water inlet filter (2) Turn on cold water shut off valve slowly (check for leaks around “C” clamps) (3) If you get leaks shut off water and re- secure “C” Clamps. 19.
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