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Noritz N-063S Series - User Manual

Noritz N-063S Series
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Descale P
Group C
rocedure
This instruc
onal manual is only intended for use by a qualified service professional or authorized Noritz
Service Representa
ve. Any unauthorized use of this manual may result in voiding the warranty.
Please contact Noritz Technical Support (866-766-7489) for add
onal support.
Noritz America Corpo on
11160 Grace Avenue, Fountain Valley, CA 92708
Phone 866-766-7489 Fax 714-241-1196
Rev. 06/16
• N-042 • N-063S Series • NR50-OD • NRC661 Series (Not A)
• N-063 • N-069M Series • NR66 Series • NR83-DVC
• N-084 • N-084M Series • NR71 Series • NRC83 Series
• N-132 • N-132M Series • NR98 Series • NRC98 Series
• N-0531S Series • NC199 Series • NR981 Series
• N-0631S Series • NRC111 Series • NC1991 Series
• N-0751M Series • NCC199 Series • NRC1111 Series
• N-0841MC Series • NR111 Series • NCC1991 Series
• N-0842MC Series • NC250 Series • NCC1992-DV
• N-0931M Series • NC380-SV-ASME
• N-1321M ASME
Pg. 1
Applicable Models:
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Overview

This document outlines the descaling procedure for a range of Noritz tankless water heaters, specifically designated as "Group C" models. The primary function of this procedure is to maintain the efficiency and longevity of the water heater by removing mineral deposits that can accumulate over time, particularly in areas with hard water. Regular descaling prevents issues such as reduced hot water flow, inconsistent water temperature, and increased energy consumption, ultimately extending the lifespan of the unit and ensuring optimal performance.

The manual emphasizes that this procedure is intended for use by a qualified service professional or an authorized Noritz Service Representative. Unauthorized use may void the warranty, highlighting the technical nature of the task and the potential for damage if not performed correctly. Noritz America Corporation provides technical support for assistance.

The document begins by listing the applicable models for this descaling procedure, which include a wide array of Noritz tankless water heaters from various series, such as N-042, N-063S, NR50-OD, NRC661, and many others, including ASME-certified models. This comprehensive list ensures that users can quickly identify if their specific unit falls under this Group C descaling protocol.

A crucial section of the manual addresses water quality and its impact on the water heater's warranty. It explicitly states that damage resulting from water in excess of 12 gpg (200 mg/L) of hardness or poor water quality is not covered by the Noritz America Limited Warranty. This underscores the importance of monitoring water hardness and considering water treatment solutions.

The manual then provides detailed "Residential Use Treatment Guidelines" and "Commercial Use Treatment Guidelines" in tabular format. These tables categorize water hardness levels (Soft, Slightly Hard, Moderately Hard, Hard, Very Hard, Extremely Hard) and recommend appropriate treatment devices and flushing frequencies. For instance, for "Soft" water (0-1 gpg), no treatment device or flushing is typically needed. However, for "Extremely Hard" water (>14 gpg), a "Treatment Required" status is indicated, often recommending H2Flow devices. The guidelines also specify that Noritz Isolation Valves should be installed to facilitate flushing, and flushing is required if a water treatment device is not installed. Commercial applications generally suggest more frequent flushing, such as "Twice a Year" for "Hard" water, compared to "Once a Year" for residential use. This section serves as a practical guide for users to assess their water quality and implement necessary preventative measures.

The core of the document is the "Flushing Procedure C," which provides step-by-step instructions for descaling the water heater. This procedure involves several key stages:

  1. Preparation and Initial Setup:

    • The user is instructed to turn on the remote controller and set the temperature to 140°F (or 145°F for specific models like N-132, N-132M, N-1321M, or NC380 series). This step is crucial for closing the "Water Servo-Bypass," which is part of the internal water flow control system.
    • The diagram illustrates the setup with isolation valves (V1, V2, V3, V4), a circulating pump, and a bucket for the flushing solution. The importance of isolation valves for diagnostic testing and easy flushing is highlighted.

  2. Initiating Water Flow and Monitoring:

    • Open the "V2 Valve" to allow water to run, initiating the unit's operation.
    • Confirm that "MM60" (Water Servo-Main position) shows "000" (fully open) and "MM62" (Water Servo-Bypass position) shows "1275" or higher (fully closed). This monitoring ensures that the internal components are in the correct state for effective descaling.

  3. Circulation of Flushing Solution:

    • Unplug the water heater from electrical power and close the "Gas Supply Valve, V1 and V2 Valves" for safety.
    • Prepare the flushing solution by mixing 1 gallon of "Calcium, Lime and Rust Removal Product" with 1 gallon of water in a bucket.
    • Place both drain hoses (H2 and H3) into the bucket containing the flushing solution.
    • Open the "V3 Valve" and "V4 Valve" for flushing.
    • Turn on the circulating pump to circulate the flushing solution for 1 hour. This continuous circulation allows the descaling agent to effectively dissolve mineral deposits within the heat exchanger.

  4. Rinsing and Reassembly:

    • After 1 hour, turn off the circulation pump.
    • Remove both drain hoses (H2 and H3) from the bucket.
    • Place the drain hose (H3) into a sink or outside to drain the used solution.
    • Close the "V3 Valve" and open the "Water Inlet Valve (V1)." It's important not to open the "Water Outlet Valve (V2)" at this stage.
    • Clean the water heater with fresh water for 3 minutes or more to thoroughly rinse out any remaining flushing solution. For condensing units, a specific instruction is provided to carefully unscrew the "Water Drain Valve" to rinse the solution and then close it.

  5. Final Steps and Verification:

    • Close the "V4 Valve" and remove both drain hoses (H1 and H3).
    • Plug the water heater back into electrical power and turn on the power ON/OFF Button on the remote controller.
    • Open the "Water Outlet Valve (V2)" and "Gas Supply Valve."
    • Finally, check for the correct operation of the water heater to ensure that the descaling process was successful and the unit is functioning properly.

The manual includes a clear diagram illustrating the connections for the flushing procedure, showing the water heater, isolation valves, circulating pump, and bucket. This visual aid helps users understand the setup and connections required. The distinction between "Condensing Models Only" for the "SS Hex" and "Primary Hex" components, along with the "Water Flow Sensor," provides specific guidance for different unit types.

Overall, this manual provides a comprehensive and detailed guide for descaling Noritz Group C tankless water heaters. It combines clear step-by-step instructions with important safety warnings, warranty information, and water quality guidelines, making it an essential resource for qualified service professionals to ensure the optimal performance and longevity of these devices. The emphasis on professional service and adherence to specific procedures highlights the technical nature of tankless water heater maintenance.

Noritz N-063S Series Specifications

General IconGeneral
ModelN-063S Series
Maximum Flow Rate6.3 GPM
Minimum Flow Rate0.5 GPM
Activation Flow Rate0.5 GPM
Gas TypeNatural Gas / Propane
Flow RateUp to 6.3 GPM
Voltage120V
Warranty12 years heat exchanger, 5 years parts

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