Noritz NRK-1 Installation guide

Brand: Noritz

Model: NRK-1

Type: Installation guide

Installation Manual

Potential dangers from accidents during installation and use are divided into the following three categories.

Closely observe these warnings, they are critical to your safety.

WARNING

CAUTION

DANGER DANGER indicates an imminently hazardous situation which, if not

avoided, will result in death or serious injury.

WARNING indicates a potentially hazardous situation which, if not

avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided,

may result in minor or moderate injury.

Vent Kit for Condensing Tankless Gas Water Heater

NRK-1

Rev. 06/23 SBB81HS

Model: NRK-1

Installation must conform with local codes, or in the absence of local codes, the National Fuel Gas Code, ANSI

Z223.1 / NFPA54 - latest edition and/or the Natural Gas and Propane Installation Code CSA B149.1 - latest

edition.

The manufacturer reserves the right to discontinue, or change at any time, the designs and/or specifications of its

products without notice.

[Applicable Model]

• EZ98DV, EZ111DV

• NRCR92DV, NRCR111DV

Refer to the installation procedure video by scanning the two-dimensional barcode on the right.

(https://help.noritz.com/index.php/knowledge-base/nrk-1installation/)

If the information in this manual is not followed exactly, a fire or explosion may result causing property

damage, personal injury or death.

WARNING

• Do not connect this vent kit to any appliance not listed in this manual.

• Do not connect this vent kit to any other manufacturer’s appliance.

DANGER

Requests to Installers

• This manual is for the vent components for the designated tankless water heater. For the installation of the

tankless water heater itself, read the installation manual that comes with the tankless water heater.

• In order to install this vent kit correctly, read this installation manual carefully, and follow the installation

instructions.

• Failures and damage caused by erroneous work or work not as instructed in this manual are not covered by

the warranty.

• Check that the installation was done properly in accordance with this installation manual upon completion.

• After completing installation, place this installation manual in a plastic pouch and attach it to the side of the

water heater, or hand it to the customer to retain for future reference.

CAUTION

1. General Information

Property damage, personal injury or death can result if these instructions are not followed. They are a guide for

professional installers generally familiar with the installation and maintenance of heating equipment and related

vent systems.

• Do not install in areas with minimum temperatures below 32°F (0°C) as condensation will form inside the

B-Vent causing corrosion.

• Do not use for anything other than designated tankless water heater (including models manufactured by

others).

• Appliances can be started up immediately after NRK-1 is installed and inspected.

2. Included Accessories and Parts Lists

Part Shape Q'ty Part#

Diffuser Items

- No Roof Kit

Diffuser 1 EZ2FVD-NRK

Base Junction Support 1 EZ2FVBJS-1

Base Junction Adapter Set 1 EZ2FVBJADS-1

3″ Diffuser Gasket 1 EZ2FVDG-1

4″ Diffuser Gasket 1 EZ2FV4DG

Aluminum Tape 4 —

Spacer for 3″ B-Vent 1 EZ2SP3-NRK

Spacer for 4″ B-Vent 1 EZ2SP4-NRK

Installation Manual

(This document) 1 —

SV Conversion 2″ Air Intake Filter 1 SV-CK-2-1

InnoFlue®

Items

2″ Polypropylene Rigid Pipe

(Straight, 3 ft) 3 ISVL023

Polypropylene-PVC Adapter 1 ISAGL0202

Centrocerin (Lubricant) 1 IACE50

Color: red

Color: white

The following accessories are included.

Check for any missing items before starting installation.

Note) PVC pipe is not included in this kit.

3. General Safety

• If similar vent has already been installed, it must be replaced with this designated new one.

• NRK-1 is designed only for installation inside of the B-Vent wall. Do not use it for other installation method.

• Make sure the B-Vent rain cap is attached before installation. Do not use this kit if the B-Vent rain cap or

B-Vent itself is corroded and damaged.

• Before installation, make sure no nails or screws have penetrated through the inner B-Vent wall where

the polypropylene pipe will be installed. Those obstructions may damage the polypropylene pipe and may

result in fires, property damage or exposure to Carbon Monoxide.

• Make sure components are kept under these following conditions.

* Clean and dry place.

* Keep out of direct sunlight.

• Handle the polypropylene pipe carefully.

Dropping, Crushing and Stacking may cause damage, and may result in fires, property damage or

exposure to Carbon Monoxide.

• NRK-1 cannot be painted.

• Avoid places where open flame are common, such as those where gasoline, benzene and adhesives are

handled, or places in which corrosive gases (ammonia, chlorine, sulfur, ethylene compounds, acids) are

present.

• Avoid installation in places where dust or debris will accumulate.

Dust may block the air-supply opening, causing the performance of the device fan to drop and incomplete

combustion may occur as a result.

• Avoid installation in places where special chemical agents (e.g. hair spray or spray detergent) are used.

• Only approved for use with the designated B-Vent manufactures.

• If the B-Vent rain cap falls off from the roof due to the installation work, access to the roof for replacement

of the rain cap may be required.

• Any work done incorrectly or not described in this manual can leave parts in the B-Vent and be difficult to

remove. In this case, access to the roof may be required.

WARNING

• Check for any damage to components that may have occurred during transportation before installation.

• Consult with the customer regarding the location of installation.

• Do not install this vent kit in a place where it may be subject to falling objects.

CAUTION

4. Before Installation (Check the condition of installation site)

Before installing the NRK-1 vent kit, verify that the installation location is suitable. All checkpoints (1-8) must be

verified to be in the “Suitable” column. If any item is found to be in the “Not Suitable” column, STOP and the Flex

Vent 2” Kit should be used instead.

Check point Suitable Not Suitable

Mark “ ” if each

condition is

matched.

1. Vent system

Vent system is used by 1 appliance only

Common vent

2. No Screws or

nails protruding

within the B-Vent

No screws or nails protruding Screws or nails protruding

3. B-Vent shape

Round Oval

4. B-Vent diameter 3″ or 4″ 5″ or larger

5. Distance B-Vent

connection from

the ceiling to the

unit

Horizontal : 5 ft or less

Vertical : 3 ft or less

Horizontal : More than 5 ft

Vertical : More than 3 ft

3 ft or les

s5 ft or less

Check point Suitable Not Suitable

Mark “ ” if each

condition is

matched.

6. Vent length from

the top of unit to

the B-Vent rain

cap

No turn from the

B-Vent rain cap to

the ceiling

8.5 ft or less (no turn)

More than 8.5 ft

There is a turn

8.5 ft or les

7. Rain cap

manufacturer

Duravent

Model: 3BVDC, 3GVDC

4BVDC, 4GVDC

Other than those in the left columns.

Amerivent

Model: 3ECW, 4ECW

Metal-Fab

Model: 3MCHP, 4MCHP

8. Connection type

of rain cap

Normal locking

Cap fits over outside of B-vent

Universal cap

Cap fits inside of B-vent

5. General System Overview

For 3″ B-Vent

For 4″ B-Vent

2ʺ Air Intake Filter

Diffuser

Spacer

Base Junction Support

Roof

Ceiling

Polypropylene-PVC adapter

B-Vent Rain Cap

PVC Items

(Elbows, Straight Pipes)

3ʺ B-Vent (Straight)

3ʺ Diffuser Gasket

2ʺ Polypropylene Pipe (Straight)

2ʺ Air Intake Filter

Diffuser

Base Junction Support

Base Junction Adapter

Roof

Ceiling

B-Vent Rain Cap

PVC Items

(Elbows, Straight Pipes)

4ʺ B-Vent (Straight)

4ʺ Diffuser Gasket + 3ʺ Diffuser Gasket

2ʺ Polypropylene Pipe (Straight)

Polypropylene-PVC adapter

Spacer

6. Installation

If the B-Vent rain cap falls off from the roof due to the installation work, access to the roof for replacement of the

rain cap may be required.

Any work done incorrectly or not described in this manual can leave parts in the B-Vent and be difficult to remove.

In this case, access to the roof to remove or replace parts may be required. Take extra care and precaution to

perform the installation as safely as possible.

1. Tools necessary for the installation

2. Installation Procedure

For an example of a proper installation of this kit. Please follow the procedure below.

If not installed correctly, the water heater will not function properly.

1. Screwdriver 2. Cutting tool 3. Tape measure 4. Marker

• Phillips head

• Flat head

• Box wrench (5/16″)

• Hacksaw

• Box Cutter

etc.

NOTE: Hand saws are

not approved for cutting.

NOTE: Single side

hook tape measures

are recommended.

Double-sided hook tape

measures may get caught

inside B-vent.

Double-sided

hook types

• For your safety, do not attempt to work on a rooftop until safety precautions have been identified and taken

including fall prevention measures, ladders or stairways, and personal protective equipment (PPE).

• Installation in windy or wet conditions require additional precautions. Follow local safety regulations.

WARNING

Except for PVC items, use only the parts provided in the package.

Using parts other than the ones provided may cause the product to be assembled incorrectly.

WARNING

[Maximum vent lengths]

• The maximum vent length is 17 ft (5.2 m). The maximum vent length of the B-Vent is 8.5 ft (2.6 m).

• The maximum allowed number of elbows is 2 using 45 degree elbows or 90 degree elbows.

Before proceeding with the installation, refer to section “4. Before Installation (Check the condition of

installation site)”.

1Remove the B-Vent between bottom of ceiling and tank type water heater.

• Do not leave the B-Vent elbow. Only straight piping from the B-Vent rain cap to the

bottom of the ceiling.

• Make sure the bottom edge of the B-Vent is below the ceiling.

• Make sure no screws or nails are protruding into the B-Vent.

• Make sure there are no holes on the inside of the B-Vent.

2Drain and remove the tank type water heater.

3Measure the original B-Vent diameter and length from the bottom of the B-Vent to the

rain cap.

Record this measurement. This distance is used to determine the total length of

polypropylene pipe.

Tape measure

B-Vent Rain Cap

B-Vent

Length

Diameter

Installation Procedure

Necessary

Accessories

and Tools

Installation Procedure

Necessary

Accessories

and Tools

4: This section details how to measure then cut the polypropylene pipes to the required length needed

for the measured B-Vent.

4-1 Check the table (on pages 12-13) for selecting proper polypropylene pipe length

in accordance with the B-Vent length.

Example of B-Vent length: 66 1/4″

NOTE:

If B-Vent measurement is 66.49″ (or less), use 66″ on the chart. If B-Vent measurement

is 66.5″ (or more), use 67″ on the chart.

4-2 Confirm the required number of polypropylene pipes and their length.

Example of B-Vent length: 66 1/4″

NOTE:

Refer to the table (on pages 12-13) before cutting the polypropylene pipe,

to prevent the female end from interfering with the base junction support and

the base junction adapter attached to the bottom end of the B-Vent. The flared

female end of the polypropylene pipe does not fit through the base junction

support or adapter.

The lengths in the table also include an additional 8” length that may be used to

easily attach any additional needed parts below the B-Vent.

Female

end

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Pipe-#3 Mark

66 35 31 3/4 13 1/4 or more 5 1/4

67 35 32 3/4 13 1/4 or more 5 1/4

[Excerpt from the table on page 12]

Pipe #1 Pipe #2 Pipe #3

[Excerpt from the table on page 12]

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Pipe-#3 Mark

66 35 31 3/4 13 1/4 or more 5 1/4

67 35 32 3/4 13 1/4 or more 5 1/4

The number of polypropylene pipes: 3

Pipe length

Pipe-#1: 35″

Pipe-#2: 31 3/4″

Pipe-#3: 13 1/4″ or more

Installation Procedure

Necessary

Accessories

and Tools

4-3 Cut the polypropylene pipe in accordance with the table with a hacksaw.

Example of B-Vent length: 66 1/4″

• Deburr the cut end using a box cutter so that damage to the diffuser gasket is

avoided.

• Remove debris from inside the polypropylene pipe prior to assembly.

Measure

Hacksaw

Box Cutter

4-4 Put a mark on the polypropylene pipe in accordance with the table.

The mark is used for confirming if the installation is done properly.

Example of B-Vent length: 66 1/4″

Proceed to Step 5 on page 14

Measure

Marker

[Excerpt from the table on page 12]

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Pipe-#3 Mark

66 35 31 3/4 13 1/4 or more 5 1/4

67 35 32 3/4 13 1/4 or more 5 1/4

Cut the pipe at

8″ from the

male end. Cut

Cut

35″

Pipe-#1 Pipe-#2 Pipe-#3

8″

31 3/4″

Necessary minimum

length: 13 1/4″

Do not cut pipe shorter than

13 1/4″, measured from the

female side of the

polypropylene pipe. This

length should be determined

by the actual water heater

installation condition such

that enough pipe is exposed

to attach adapter.

1/8″ (3 mm)

or less

3° or less

Determine the length of pipe #3

according to the location of the

water heater

[Excerpt from the table on page 12]

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Pipe-#3 Mark

66 35 31 3/4 13 1/4 or more 5 1/4

67 35 32 3/4 13 1/4 or more 5 1/4

5 1/4″

Mark

Pipe-#3

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Mark Pipe-#2 Pipe-#3

12 18 or more 12

Not used. Not used.

13 19 or more 13

14 20 or more 14

15 21 or more 15

16 22 or more 16

17 23 or more 17

18 24 or more 18

19 25 or more 19

20 26 or more 20

21 27 or more 21

22 28 or more 22

23 29 or more 23

24 30 or more 24

25 31 or more 25

26 32 or more 26

27 33 or more 27

28 34 or more 28

29 35 29

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Mark Pipe-#3

38 35 12 3/4 or more 4 3/4

Not used.

39 35 13 3/4 or more 5 3/4

40 35 14 3/4 or more 6 3/4

41 35 15 3/4 or more 7 3/4

42 35 16 3/4 or more 8 3/4

43 35 17 3/4 or more 9 3/4

44 35 18 3/4 or more 10 3/4

45 35 19 3/4 or more 11 3/4

46 35 20 3/4 or more 12 3/4

47 35 21 3/4 or more 13 3/4

48 35 22 3/4 or more 14 3/4

49 35 23 3/4 or more 15 3/4

50 35 24 3/4 or more 16 3/4

51 35 25 3/4 or more 17 3/4

52 35 26 3/4 or more 18 3/4

53 35 27 3/4 or more 19 3/4

54 35 28 3/4 or more 20 3/4

55 35 29 3/4 or more 21 3/4

56 35 30 3/4 or more 22 3/4

57 35 31 3/4 or more 23 3/4

58 35 32 3/4 or more 24 3/4

59 35 33 3/4 or more 25 3/4

60 35 34 3/4 or more 26 3/4

61 35 35 3/4 or more 27 3/4

62 35 36 3/4 or more 28 3/4

63 35 37 3/4 or more 29 3/4

64 35 38 3/4 or more 30 3/4

65 35 39 3/4 or more 31 3/4

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Mark Pipe-#3

30 26 1/2 13 1/4 or more 5 1/4

Not used.

31 27 1/2 13 1/4 or more 5 1/4

32 28 1/2 13 1/4 or more 5 1/4

33 29 1/2 13 1/4 or more 5 1/4

34 30 1/2 13 1/4 or more 5 1/4

35 31 1/2 13 1/4 or more 5 1/4

36 32 1/2 13 1/4 or more 5 1/4

37 33 1/2 13 1/4 or more 5 1/4

For B-Vent length from 12″ to 29″ For B-Vent length from 38″ to 65″

For B-Vent length from 30″ to 37″

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Pipe-#3 Mark

66 35 31 3/4 13 1/4 or more 5 1/4

67 35 32 3/4 13 1/4 or more 5 1/4

68 35 33 3/4 13 1/4 or more 5 1/4

69 35 34 3/4 13 1/4 or more 5 1/4

70 35 35 3/4 13 1/4 or more 5 1/4

71 35 36 3/4 13 1/4 or more 5 1/4

72 35 37 3/4 13 1/4 or more 5 1/4

73 35 38 3/4 13 1/4 or more 5 1/4

For B-Vent length from 66″ to 73″

B-Vent

length

[inch]

Polypropylene pipe length [inch]

Pipe-#1 Pipe-#2 Pipe-#3 Mark

74 35 40 1/4 12 3/4 or more 4 3/4

75 35 40 1/4 13 3/4 or more 5 3/4

76 35 40 1/4 14 3/4 or more 6 3/4

77 35 40 1/4 15 3/4 or more 7 3/4

78 35 40 1/4 16 3/4 or more 8 3/4

79 35 40 1/4 17 3/4 or more 9 3/4

80 35 40 1/4 18 3/4 or more 10 3/4

81 35 40 1/4 19 3/4 or more 11 3/4

82 35 40 1/4 20 3/4 or more 12 3/4

83 35 40 1/4 21 3/4 or more 13 3/4

84 35 40 1/4 22 3/4 or more 14 3/4

85 35 40 1/4 23 3/4 or more 15 3/4

86 35 40 1/4 24 3/4 or more 16 3/4

87 35 40 1/4 25 3/4 or more 17 3/4

88 35 40 1/4 26 3/4 or more 18 3/4

89 35 40 1/4 27 3/4 or more 19 3/4

90 35 40 1/4 28 3/4 or more 20 3/4

91 35 40 1/4 29 3/4 or more 21 3/4

92 35 40 1/4 30 3/4 or more 22 3/4

93 35 40 1/4 31 3/4 or more 23 3/4

94 35 40 1/4 32 3/4 or more 24 3/4

95 35 40 1/4 33 3/4 or more 25 3/4

96 35 40 1/4 34 3/4 or more 26 3/4

97 35 40 1/4 35 3/4 or more 27 3/4

98 35 40 1/4 36 3/4 or more 28 3/4

99 35 40 1/4 37 3/4 or more 29 3/4

100 35 40 1/4 38 3/4 or more 30 3/4

101 35 40 1/4 39 3/4 or more 31 3/4

102 35 40 1/4 40 1/4 32 1/4

For B-Vent length from 74″ to 102″

5Attach the diffuser and the 3″ diffuser gasket to the cut side of the pipe-#1.

Diffuser

3″ Diffuser

Gasket

4″ Diffuser

Gasket

(only for 4″

B-Vent)

Fix the diffuser and the 3″ diffuser gasket to the pipe-#1 by 3 screws.

• After installation, visually confirm that the diffuser, 3″ diffuser gasket, and pipe are

securely fastened by looking through holes in the diffuser.

For 4″ B-Vent, put 4″ diffuser gasket on top of 3″ diffuser gasket.

3″ Diffuser Gaske

Too Much

Screws not

penetrating pipe

3″ Diffuser Gasket

4″ Diffuser Gasket

3″ Diffuser Gaske

4″ Diffuser Gaske

Installation Procedure

Necessary

Accessories

and Tools

Installation Procedure

Necessary

Accessories

and Tools

6Peel off the release paper of the double sided tape attached on the diffuser top and

attach the spacer.

NOTE:

Make sure the spacers are correctly oriented.

Spacer for 3″

B-Vent

Spacer for 4″

B-Vent

7Apply Centrocerin (Lubricant) only to the top and bottom of the diffuser gasket.

Diffuser

Diffuser Gasket

Polypropylene pipe

Apply Centrocerin

(Lubricant)

Centrocerin

(Lubricant)

8Loosen the 2 bands on the top and bottom of the base junction support.

[For 4″ B-Vent]

Attach the base junction support to the base junction adapter and make the base

junction adapter set.

The tightening torque should be between 7 and 10 in lb.

Base Junction

Support

Base Junction

Adapter

Screwdriver

(Flat head)

Box wrench

(5/16″)

Release Paper

[For 3″ B-Vent]

Use spacer for 3″ B-Vent.

Red

[For 4″ B-Vent]

Use spacer for 4″ B-Vent.

Whit

Loosen by at

least one turn

Tighten

Installation Procedure

Necessary

Accessories

and Tools

9Pass the pipe-#1 in the B-Vent very carefully.

10 Connect next polypropylene pipe. Make sure that it is firmly inserted all the way in with

Centrocerin, then fix it by using aluminum tape.

NOTE:

• If you only use pipe-#1 and pipe-#2, make sure pipe-#2 is the pipe you marked in

step 4-4.

• When using pipe-#3, install using the same procedure as above.

In this case, make sure pipe-#3 is the pipe you marked in step 4-4.

• Insert the pipes more carefully as the mark approaches to the B-Vent end.

Centrocerin

(Lubricant)

Aluminum tape

Spin

Push

Pipe-#1:

Polypropylene

pipe with diffuse

B-Vent

Do not insert

completely as it will

connect with other

polypropylene pipes.

Mark

Pipe-#2 Pipe-#3

Apply a thin layer of

Centrocerin to the O-ring

attached to the female side

of the polypropylene pipe.

Fix the connection part of

the polypropylene pipe with

aluminum tape.

Aluminum tape

Matching surface

Make sure the marked point and

the B-Vent end are approximately

in the same position.

If there is a difference of more

than 2 inches, start over from

step 3.

Mark Mark

than

2″

Mark

than

2″

Installation Procedure

Necessary

Accessories

and Tools

11 Connect the base junction support with end of the B-Vent.

When passing the base junction support through the polypropylene pipe, hold the

polypropylene pipe firmly and be careful not to push the polypropylene pipe up the

B-Vent rain cap.

NOTE:

• If you fail to hold the polypropylene pipe in place, the entire assembly may push up

and jar the B-Vent rain cap out of place.

• Fix the spacer with the spacer touching the top surface

of the B-Vent rain cap so that the polypropylene pipe

does not fall down.

• [For 4″ B-Vent] Attach the base junction adapter set

with 2 screws from outer pipe of the B-Vent.

• Tighten the band on the base junction support for the B-Vent and the polypropylene

pipe, and then fix them completely.

• The tightening torque should be between 7 and 10 in lb.

Screwdriver

(Phillips head)

Screwdriver

(Flat head)

Box wrench

(5/16″)

12 Attach the polypropylene-PVC adapter to the polypropylene pipe with Centrocerin.

Polypropylene

-PVC Adapter

Centrocerin

(Lubricant)

Spacer

Top surface of the

B-Vent rain cap

Base Junction Suppor

Tighten

Tighte

Base Junction Support

(Example of 3″ B-Vent)

Screws

Base Junction Support

Base Junction Adapter

Tighten

(Example of 4″ B-Vent)

Apply a thin layer of

Centrocerin to the O-ring

attached to the female side of

the polypropylene-PVC

adapter.

Polypropylene-PVC adapter

(Example of 3″ B-Vent)

Installation Procedure

Necessary

Accessories

and Tools

13 Make PVC pipe route to the water heater by using elbows (90 or 45 degree), straight

pipes (short sections).

Screwdriver

(Flat head)

Box wrench

(5/16″)

14 Fix the connection part with aluminum tape.

Aluminum tape

(Example of 3″ B-Vent)

Polypropylene-PVC

adapter

PVC items (Elbows, Straight pipes)

You can move the water heater

left or right to adjust the PVC pipe.

(Example of 3″ B-Vent)

WARNING

Determine the proper length not giving

too much tension to vent pipe.

If the PVC pipe is too

short, there will be

tension to those parts.

Be careful not to make trap

configuration of PVC pipe.

Slope the horizontal vent 1/4″

upwards for every 12″ (305 mm)

toward the termination to drain

condensate.

Aluminum tape

Polypropylene-PVC

adapter

PVC items

(Elbows, Straight pipes

)

Aluminum tape

Polypropylene-PVC

adapter

Polypropylene pipe

Installation Procedure

Necessary

Accessories

and Tools

15 Insert the air intake filter into the intake.

Follow the instruction in the SV conversion kit installation manual to install the SV

conversion kit. Screwdriver

(Flat head)

Box wrench

(5/16″)

16 Adjust the exhaust type setting to single vent (SV).

Example of GQ-C3260 series

Remove the front cover and adjust the DIP switch.

Disconnect the electrical power and then turn ON DIP switch #3.

17 Make sure that there is no leakage or loose connection in the venting system.

18 After installation is completed, visually confirm the B-Vent rain cap has not been

dislodged during installation.

Air Intake Filter

Failure to perform this step will

result a “73” code displayed on

the Remote Controller and a

cease in operation.

If this occurs, disconnect, then

reconnect the electrical power

to the water heater to reset the

system.

Circuit Board

12345678

OFF

Here

CARBON MONOXIDE POISONING

Failure to properly seal the vent system could cause dangerous flue gases to

enter the living space.

WARNING

7.Maintenance

• The venting system must be examined periodically by a qualified service technician to check for any leaks or

corrosion.

• Check and confirm that there is no tension to the polypropylene and PVC pipe by hanging or suspending of

anything.

• When replacing the water heater, replace whole venting components to new ones.

Periodically check the following to ensure

proper operation of the water heater.

Noritz NRK-1 Installation guide

Noritz NRK-1 Installation guide

Noritz NRK-1 Installation guide

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