Noritz NRC1111-OD Operating and maintenance manual

NRC1111-OD, NRC1111-DV
NCC1991-OD, NCC1991-DV
NCC1992-DV
NRC111OD(GQ-C3257WX US), NRC111DV(GQ-C3257WX-FF US)
NCC199OD(GQ-C3257WZ US), NCC199DV(GQ-C3257WZ-FF US)
SKJ70RQ
Rev. 05/16 Page 1
Phone [phone] Fax [phone]
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.
This instructional manual is only intended for use by a qualified service professional or authorized Noritz
Model Include :
11160 Grace Avenue, Fountain Valley, CA 92708
Heat Exchanger Replacement
Noritz America Corporation

Heat Exchanger Replacement Procedure
1. Drain the unit as shown in follwing procedure 1. Drain the unit as shown in follwing procedure
Manual Draining
Page 2
Drainage using the Remote Controller
Procedure
* RC-9018M
* RC-7651M
Drain Plugs
Each drain plug might not be
visible if insulation is installed
around the piping.

Heat Exchanger Replacement Procedure
Diagram
(2) Remove additional ground wires
Page 3
Procedure
2. Remove Front Cover
(1)Disconnect electrical power to the unit
(2)Turn off gas and water
(3) Remove 4 screws
3. Remove Lightning Protection
(1) Remove 2 screws that hold the Lightning Protection Plate
(Whichever the unit is in case No.1, 2, 3)
(3) Let Lightning Protection hang outside of the unit
(1)
Case No.1
(2)
Case No.2
(2)
Case No.3
(2)
(1)
(1)
Ex.
)
OD model

Heat Exchanger Replacement Procedure
Diagram
4. Unplug all wires that attach to the wiring harness
and the body of the unit
(1) Loosen the wire anchor from left side of Case,
unplug Freeze Prevention Heaters (2),
remove Cover - Drain
(2) Loosen the wire anchor from Condensate Container,
unplug Freeze Prevention Heaters (2),
Water Servo - Main, Water Level Electrode,
and Thermistor - Heat Exchanger
(3) Remove Cable Tie,
unplug Freeze Prevention Heaters (3),
Water Servo - Bypass, and Thermistor - Hot Water
(4) Remove Cable Tie,
unplug Freeze Prevention Heaters (2),
Wiring for Fan Motor, Water Flow Sensor,
Thermistor - Cold Water, and Wiring for Manifold Plate
Page 4
Procedure
Cover - Drain
(1)
(2)
(3)
(4)
Cable Tie
Cable Tie

Heat Exchanger Replacement Procedure
Diagram
(5) Unplug wiring for Igniter
DV model only ; Unplug Thermistor - Exhaust
(6) Loosen the wire anchor from right side of Case,
unplug Freeze Prevention Heater, High Limit Switch,
Thermal Fuse (2) and Themistor - Scale Detection*
(7) Unplug Flame Rod and Ignition Plug
(8) Let all wires hang outside of the unit
Page 5
Procedure
(5)
Thermistor-Exhaust
(6)
(7)
(8)
Thermistor - Scale Detection
*The following models have "Thermistor
- Scale Detection"
NRC111OD(GQ-C3257WX US)
NRC111DV(GQ-C3257WX-FF US)
NCC199OD(GQ-C3257WZ US)
NCC199DV(GQ-C3257WZ-FF US)
Ex.
)
DV model

Heat Exchanger Replacement Procedure
Diagram
5. DV model only ; Remove Exhaust Flue from top of the unit
(1) Disconnect the venting from the unit
(2) Remove 4 screws and pull Exhaust Flue off of the unit
and set aside
6. Remove Manifold Plate
(1) Remove 4 big silver screws on Manifold Plate
that attach the Manifold Plate to Burner
(2) Remove "C" Clamp
(3) Locate inlet pipe to Manifold Plate and push up,
remove the Manifold Plate
7. Remove Pipe - 1/4" Drain from Copper Heat Exchanger
(CU HE)
(1) Remove 2 "C" Clamps
(2) Remove the pipe
Page 6
Procedure
(2)
(1)
(2)
(1)
(3)
(1)

Heat Exchanger Replacement Procedure
Diagram
8. Remove Pipe - Flow Sensor to Stainless Steel
Heat Exchanger (SS HE) and Water Flow Sensor
(1) Remove "C" Clamp on top of the pipe going into SS HE
(2) Remove "C" Clamp on bottom of the pipe
going into Water Flow Sensor
(3) Remove the pipe
(4) Remove "C" Clamp on Water Flow Sensor,
remove Water Flow Sensor
9. Remove Condensate Container
(1) Remove the screw holding the metal clamp on
the top of Condensate Container
(2) Remove 3 Hose Clamps on the hoses of Condensate
Container, 1 will be right below SS HE and other 2
will be on Condensate Container (you will need a
needle nose pliers to open Hose Clamps)
(3) Pull hoses off and lift up Condensate Container,
remove Condensate Container
Page 7
Procedure
(1)
(1)
(4)
(2)
(2)
Pipe - Flow Sensor to SS HE
(2)
(2)
(3)
SS HE

Heat Exchanger Replacement Procedure
Diagram
10. Disconnet a pipe from Water Servo - Main
(1) Remove "C" Clamp,
disconnect a pipe from Water Servo - Main
11. Remove the assembly from Case
(1) Remove 2 set screws on the bottom of Burner
(2) Remove 2 set screws near the top of Case
(Surpport bottom of the assembly)
(3) SS HE, Copper Heat Exchanger(CU HE), Burner, and
Fan Motor will come out in one section, remove from
the unit
Page 8
Procedure
(1)
Water Servo - Bypass
(1)
(2)
Water Servo - Main
Ex.) DV model

Heat Exchanger Replacement Procedure
Diagram
12. Remove Pipe - Heat Exchanger SS to CU
(1) Remove "C" Clamp on top of the pipe going into SS HE
(2) Remove "C" Clamp on the pipe going into CU HE
(3) Remove the pipe
13. Separate SS HE from CU HE
(1) Remove 2 screws on the bracket between SS HE
and CU HE
(2) Remove 7 screws that located on the
back side of SS HE
(3) Separate SS HE from CU HE
Page 9
Procedure
Pipe - Heat Exchanger SS to CU
(
1
)
(
2
)
(2)
(1)
NRC1111-OD/DV
NCC1991-OD/DV
NCC1992-DV
NRC111OD/DV(GQ-C3257WX＊＊)
NCC199OD/DV(GQ-C3257WZ＊＊)
Pipe - Heat Exchanger SS to CU

Heat Exchanger Replacement Procedure
Diagram
14. Replacing SS HE
Note: If you are not replacing SS HE then,
you can skip this step and set SS HE aside.
(1) Remove old Gasket between SS HE and CU HE Exhaust
Box and replace with new one
(2) OD model only ;
Remove Gasket on the front of SS HE and place
on new one
15. Remove CU HE
(1) Remove 12 screws holding Burner to CU HE
(2) Separate Burner from CU HE
16. Remove the heat exchanger components from
old heat exchanger and put on new heat exchanger
(1) Front side: Freeze Prevention Heater
(2) Right side: High Limit Switch and Freeze Prevention
Heater (Secure to put Freeze Prevention Heater on
same position)
(3) Left side: Freeze Prevention Heater
(Secure to put Freeze Prevention Heater on
same position)
(4) Back side: Thermistor - Scale Detection*
Remove Packing on CU HE
Remove the small screw(M3×6) on CU HE
that holding the Thermistor - Scale Detection
Page 10
Procedure
(1)
(
1
)
Front side
(
2
)
Ri
g
ht side
(
3
)
Left Side
(1)
(2)
NRC1111-OD/DV
NCC1991-OD/DV
NCC1992-DV
NRC111OD/DV(GQ-C3257WX＊＊)
NCC199OD/DV(GQ-C3257WZ＊＊)
(
2
)
Ri
g
ht side
(
4
)
Back Side
Thermistor - Scale Detection
NRC111OD/DV(GQ-C3257WX＊＊)
NCC199OD/DV(GQ-C3257WZ＊＊)
Gasket
*The following models have "Thermistor
- Scale Detection"
NRC111OD(GQ-C3257WX US)
NRC111DV(GQ-C3257WX-FF US)
NCC199OD(GQ-C3257WZ US)
NCC199DV
(
GQ-C3257WZ-FF US
)
Gasket
Packing
- for holding Thermistor