Noritz NR501-OD Installation Manual
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Noritz NR501-OD Installation Manual

Tankless gas water heater
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See also: Service Manual , Owner's Manual
Installation Manual
TANKLESS GAS WATER HEATER
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.
DANGER
WARNING
CAUTION
WARNING:
If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Prohibited
Requests to Installers
• In order to use the water heater safely, read this installation manual carefully, and follow the in-
stallation 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, please either place this Installation Manual in a plastic pouch and
attach it to the side of the water heater (or the inside of the pipe cover or recess box if applicable),
or hand it to the customer to retain for future reference. Also, be sure to fill in all of the required
items on the warranty and to hand the warranty to the customer along with the Owner's Guide.
SBB8066
Rev. 01/14
NR501-OD
NR662-OD
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.
Disconnect
Power
CAUTION
Low NOx
Approved by
SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)
(Outdoor Installation)
(Outdoor Installation)
Ground
FOR USE IN RESIDENTIAL APPLICATIONS.
Installation must conform with local codes, or in the absence of
local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA
54- latest edition.
Noritz America reserves the right to discontinue, or change
at any time, the designs and/or specifications of its products
without notice.
NORITZ AMERICA
CORPORATION
Be sure to do
*SBB8066*

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Summary of Contents for Noritz NR501-OD

  • Page 1 Installation Manual NORITZ AMERICA CORPORATION TANKLESS GAS WATER HEATER NR501-OD (Outdoor Installation) NR662-OD (Outdoor Installation) 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.

  • Page 2: Included Accessories

    Included Accessories The following accessories are included with the unit. Check for any missing items before starting installation. Part Shape Q’ty Part Shape Q’ty Owner's Guide, Warranty, Cross Recessed Installation Manual Head Screw each (this document) The accessories listed below are not Optional Accessories included with the units, but may be necessary for installation.

  • Page 3: Before Installation

    • Check that the rating plate indicates the correct type of gas. • Check that the gas supply line is sized for 120,000 Btuh for NR501-OD. (140,000 Btuh for NR662-OD.) Check the Power • The power supply required is 120VAC, at 60Hz.
  • Page 4 WARNING • Avoid places where fires 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. Prohibited Using the incorrect voltage may result in fire or cracking. •...

  • Page 5: Installation Clearances

    Installation Clearances WARNING Before installing, check for the following: Install in accordance with relevant building and mechanical codes, as well as any local, state or national regulations, or in the absence of local and state codes, to the National Fuel Gas Code ANSI Z223.1/ NFPA 54 –...
  • Page 6 Clearance Requirements from Vent Terminations to Building Openings * All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code, ANSI Z223.1. Vent Terminal Area Where Terminal is Not Permitted Air Supply Inlet US Non-Direct Vent Description Installations Clearance above grade, veranda, porch,...

  • Page 7: Securing To The Wall

    Installation Securing to the wall • The weight of the device will be applied to the wall. If the strength of the wall is not sufficient, reinforcement must be done to prevent the transfer of vibration. • Do not drop or apply unnecessary force to the device when installing. Internal parts may be damaged and may become highly dangerous.

  • Page 8: Gas Piping

    Gas Piping Follow the instructions from the gas supplier. CAUTION The guidelines and examples we have provided in this manual section are for reference only. The sizing and installation of the gas system for this water heater, as with any gas appliance, is the sole responsibility of the installer.
  • Page 9 WARNING Pressure Test The appliance and its gas connections must be leak tested before placing the appliance in operation. The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than ½...
  • Page 10 Outlet E: 25' (7.5m) (Use 30' (9m)), 120,000 Btuh requires 3/4" (NR501-OD) 140,000 Btuh requires 3/4" (NR662-OD) Natural Gas Section 4: 45' (13.5m) (Use 50' (15m)), 295,000 Btuh requires 1 1/4" (NR501-OD) Meter 315,000 Btuh requires 1 1/4" (NR662-OD) Table 2. For 8” WC – 10.5” WC initial supply pressure Maximum Natural Gas Delivery Capacity (3.0”...
  • Page 11 Table 3. Maximum Undiluted Propane (LP) Delivery Capacity in Thousands of BtuH (0.5” WC Pressure Drop) Length (including fittings) Pipe 100' 125' 150' 200' Size (3m) (6m) (9m) (12m) (15m) (18m) (21m) (24m) (2m) (30m) (38m) (45m) (60m) 1/2" 3/4" 1"...

  • Page 12: Water Piping

    Z21.22, or The ANSI/ASME Boiler and Pressure Vessel Code, Section IV ( Heating Boilers ). This pressure relief valve must be capable of an hourly Btu rated temperature steam discharge of 120,000 Btuh for NR501-OD (140,000 Btuh for NR662-OD). Multiple valves may be used. The pressure relief capacity must not exceed 150 psig. No valve shall be placed between the relief valve and the water heater.
  • Page 13 Supply water piping Hot water piping • Do not use PVC, iron, or any piping which has been • Do not use lead, PVC, iron or any piping which treated with chromates, boiler seal or other chemicals. has been treated with chromates, boiler seal or •...

  • Page 14: Water Treatment System

    Water Treatment If this water heater will be installed in an application where the supply water is hard, the water must be treated with either the Noritz H2Flow or ScaleShield or a water softener. Refer to the below tables for suggested treatment and maintenance measures to be taken based on the water hardness level.
  • Page 15 the Heat Exchanger must be flushed. is set to "Flushing Mode". from an authorized Noritz wholesaler.
  • Page 16 located...

  • Page 17: Plumbing Applications

    Plumbing Applications Recirculation System Notes: 1. Size the pump to provide a maximum of 1.5GPM (5.7L/min.) through the system at 10ft (0.3m) of head plus piping losses. Adjust the flow using a globe valve and verify the Hot Water Return flow rate with the maintenance monitors.

  • Page 18: Electrical Wiring

    Electrical Wiring Consult a qualified electrician for the electrical work. Do not connect electrical power to the unit until all electrical wiring has been completed. Disconnect Power This appliance must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI/NFPA 70.
  • Page 19 Adjusting Set Temperature • This unit can be programmed so that it will default to one of four temperatures if the optional remote controller is not used [140 °F (60 °C), 135 °F (57 °C), 130 °F (55 °C), 120 °F (50 °C)]. To change the default temperature, adjust the DIP switches as described below.

  • Page 20: Connecting Remote Controller Cord To Unit

    Connecting Remote Controller Cord to Unit • Keep the remote controller cord away from the freeze prevention heaters in the unit. • Tie the redundant cord outside the water heater. Do not put the extra length inside the equipment. • The remote controller cord can be extended up to 83' (25m) with 18AWG wire. •...

  • Page 21: Maintenance

    Maintenance Periodically check the following to ensure proper operation of the water heater. • The venting system must be examined periodically by a qualified service technician to check for any leaks or corrosion. • The burner flame must be checked periodically for a proper blue color and consistency. •...

  • Page 22: Lighting Instructions

    WARNING A fire or explosion may result if these instructions are not followed, which may cause lose of life, personal injury or property damage. Lighting Instructions This water heater does not have a pilot. It is equipped with an ignition device that automatically lights the burner.
  • Page 23 Dimensions NR501-OD < inch (mm) > 13.3" (338mm) 4- φ0.5" (φ13mm) 2-0.3"×0.5" (6.5×13mm) OBLONG HOLE 4.7" (120mm) 0.4" (10mm) 6.7" (170mm) 13.8" (350mm) 3.3" (85mm) 1.6" (40mm) 13.1" (334mm) 2.0" (50mm) 1.1" (27mm) 7.0" (178mm) 0.4" (11mm) 2.9" (73mm) AIR INLET...
  • Page 24 NR662-OD < mm (inch) > 13.3" (338mm) 4- φ0.5" (φ13mm) 2-0.3"×0.5" (6.5×13mm) OBLONG HOLE 4.7" (120mm) 0.4" (10mm) 6.7" (170mm) 3.3" (85mm) 1.6" (40mm) 13.8" (350mm) 2.0" (50mm) 1.1" (27mm) 13.1" (334mm) 8.4" (214mm) 0.4" (11mm) 1.5" (37mm) AIR INLET DISPLAY WINDOW AIR INLET 2.4"...
  • Page 25 For Installers: Read this installation guide Optional Remote Controller RC-7651M carefully before carrying out installation. Installation Guide NORI T Z AMERI C A CORPORATI O N Note Do not connect power to the water heater before the remote controller has been properly installed. Recommended installation location of the remote controller is in a bathroom.
  • Page 26 Installation 3. Remove the cover of the remote control, 1. Apply Wall Packing to the rear side of the mark the location of the screw holes, and remote controller. drill holes for the wall anchors. 2. Connect the remote controller wires to the 4.
  • Page 27 Installing the Remote Controller Outdoor Junction Box 5. Slide the box nut over the remote controller 1. Insert the remote controller wires through the wires and screw it onto the wall pipe. wall pipe and secure the wall pipe to the remote controller.

This manual is also suitable for:

Nr662-od

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