Noritz EZ98 User Manual

FADK109
Rev. 06/17
Page 1
11160 Grace Avenue, Fountain Valley, CA 92708
Phone 866-766-7489 Fax 714-241-1196
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.
Contact Noritz Technical Support (866-766-7489) for additional support.
Noritz America Corporation
Heat Exchanger Replacement
EZ98 (EZTR50) [GQ-C2859WX-FF US]
EZ111 (EZTR75) [ GQ-C3259WX-FF US]
NCC199CDV [GQ-C3259WZ-FF US]
NRCB180DV [GHQ-C2801WX-FF US]
NRCB199DV [GHQ-C3201WX-FF US]

Noritz EZ98 Specifications

General

Category	Tankless Water Heater
Series	EZ Series
Fuel Type	Natural Gas
Maximum BTU Input	199, 000 BTU/h
BTU Input Range	15, 000 - 199, 000 BTU/hr
Venting	Direct Vent
Voltage	120V
Water Connections	3/4"

Summary

1. Drain the unit

Drainage using Remote Controller

Procedure for draining water using the remote controller for various models.

Manual Draining Procedures

Steps for manual draining for different Noritz water heater models.

1. Draining for NRCB Models

Drainage using Operation Panel

Procedure for draining water using the unit's operation panel for NRCB models.

Manual Draining for NRCB

Steps for manual draining for NRCB199DV/NRCB180DV models.

2. Remove Front Cover

Front Cover Removal (EZ/NCC Models)

Steps to remove the front cover for EZ111DV/EZ98DV or NCC199CDV models.

Front Cover Removal (NRCB Models)

Steps to remove the front cover for NRCB199DV/NRCB180DV models.

3. Remove Ground Wires

4. Unplug Wiring Harness

Unplugging Wires (EZ/NCC Models)

Procedure to unplug specific wires for EZ111DV/EZ98DV or NCC199CDV models.

Unplugging Wires (NRCB Models)

Procedure to unplug specific wires for NRCB199DV/NRCB180DV models.

5. Remove Pipes (EZ111DV/EZ98DV/NCC199CDV)

General Pipe Removal Steps

Disconnecting common pipes like freeze prevention heaters and gas valve.

Model-Specific Pipe Removal (EZ/NCC)

Unplugging specific components for EZ111DV/EZ98DV and NCC199CDV.

5. Remove Pipes (NRCB199DV/NRCB180DV)

Pipe Removal for NRCB Models

Steps to remove pipes for NRCB199DV/NRCB180DV models.

6. Remove Fan Motor and Venturi Assembly

Fan Motor & Venturi Removal (EZ/NCC Models)

Steps to remove fan motor and venturi assembly for EZ111DV/EZ98DV or NCC199CDV.

Fan Motor & Venturi Removal (NRCB Models)

Steps to remove fan motor and venturi assembly for NRCB199DV/NRCB180DV.

7. Remove Heat Exchanger Assembly from Case

Heat Exchanger Assembly Removal

Procedure to remove the heat exchanger assembly from the main case.

8. Remove Parts from the Heat Exchanger

Heat Exchanger Parts Removal

Steps to remove specific parts from the heat exchanger unit.

9. Separate Primary SS HEX and Secondary SS HEX

Separating SS HEX Components

Procedure to separate the primary and secondary SS HEX components.

10. Separate Primary SS HEX and Burner Chamber

HEX and Burner Chamber Separation

Steps to separate the primary SS HEX and the burner chamber.

11. Replace Primary SS HEX

Attaching New Primary SS HEX

Procedure to attach the new primary SS HEX with relevant components.

12. Join Primary SS HEX and Burner Chamber

Joining HEX and Burner Chamber

Procedure to join the primary SS HEX and burner chamber with new gasket.

12. Rejoin Primary SS HEX and Burner Chamber

Securing HEX and Burner Chamber

Steps to secure the primary SS HEX and burner chamber with screws.

13. Assemble Primary SS HEX and Secondary SS HEX

Assembling SS HEX Components

Procedure to assemble the primary and secondary SS HEX with new gasket and screws.

14. Exhaust Duct Replacement

Exhaust Duct Replacement Procedure

Steps for replacing the exhaust duct, including gasket and mounting plate.

15. Attach Parts to Heat Exchanger

Attaching Igniter and Secondary SS HEX

Procedure to attach the igniter mounting plate and secondary SS HEX to the heat exchanger.

16. Fix Heat Exchanger Assembly in Case

Securing Heat Exchanger Assembly

Steps to fix the heat exchanger assembly into the main case.

17. Attach Fan Motor and Venturi Assembly

Attaching Fan Motor and Venturi Assembly

Procedure to attach the fan motor and venturi assembly to the burner chamber.

18. Attach Pipes (EZ111DV/EZ98DV/NCC199CDV)

Attaching Pipes (EZ111DV/EZ98DV)

Steps to attach pipes for EZ111DV/EZ98DV models.

Attaching Pipes (NCC199CDV)

Steps to attach pipes for NCC199CDV models.

18. Attach Pipes (NRCB199DV/NRCB180DV)

Attaching Pipes (NRCB Models)

Steps to attach pipes for NRCB199DV/NRCB180DV models.

19. Plug Wires to Wiring Harness

Plugging Wires (EZ/NCC Models)

Procedure to plug wires for EZ111DV/EZ98DV or NCC199CDV models.

Plugging Wires (NRCB Models)

Procedure to plug wires for NRCB199DV/NRCB180DV models.

20. Attach Ground Wires

21. Attach Circuit Board

Attaching Circuit Board (EZ/NCC Models)

Steps to attach the circuit board for EZ111DV/EZ98DV or NCC199CDV.

Attaching Circuit Board (NRCB Models)

Steps to attach the circuit board for NRCB199DV/NRCB180DV.

22. Attach Front Cover

Attaching Front Cover (EZ/NCC Models)

Steps to attach the front cover for EZ111DV/EZ98DV or NCC199CDV.

Attaching Front Cover (NRCB Models)

Steps to attach the front cover for NRCB199DV/NRCB180DV.