Noritz N-0751M - User Manual

Other manuals for Noritz N-0751M

Installation Manual120 pages

Field Manual60 pages

Instructional Manual4 pages

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Summary

Important Safety Information

Warning Iconography and Risk Levels

Explains DANGER, WARNING, CAUTION icons, and general hazard symbols.

Flammable Liquids and Scalding Hazards

Details risks associated with flammable vapors and high water temperatures causing burns.

Operational Safety Precautions

Exhaust System and Gas Safety

Covers safe operation of the exhaust system and precautions for gas leaks.

Ignition, Water Damage, and Valve Safety

Advises against manual ignition, handling water-damaged units, and proper valve operation.

Emergency Procedures and Explosion Hazards

Outlines actions for gas leaks, abnormal combustion, and pressure relief valve safety.

Installation and Environmental Safety

Installation Clearance and Location Requirements

Specifies safe distances for vent terminals and installation area requirements.

Combustible Materials and Air Quality

Carbon Monoxide Prevention and Codes

Highlights carbon monoxide risks and emphasizes adherence to installation codes.

Usage, Maintenance, and Freezing Safety

Electrical, Maintenance, and Unit Coverage Safety

Preventing Damage from Freezing

Automatic Freeze Prevention System

Manual Freezing Protection Measures

Provides steps for protecting the unit and plumbing in extremely cold conditions.

Draining Procedure for Long-Term Storage

Troubleshooting Common Issues

Initial Operation and Ignition Problems

Temperature and Flow Rate Issues

Addresses concerns about water temperature, flow rate, and heating performance.

Hot Water Volume and Alarm Problems

Error Code Diagnosis and Resolution

Explains how to interpret and resolve specific error codes shown on the remote controller.

Summary

Important Safety Information

Warning Iconography and Risk Levels

Explains DANGER, WARNING, CAUTION icons, and general hazard symbols.

Flammable Liquids and Scalding Hazards

Details risks associated with flammable vapors and high water temperatures causing burns.

Operational Safety Precautions

Exhaust System and Gas Safety

Covers safe operation of the exhaust system and precautions for gas leaks.

Ignition, Water Damage, and Valve Safety

Advises against manual ignition, handling water-damaged units, and proper valve operation.

Emergency Procedures and Explosion Hazards

Outlines actions for gas leaks, abnormal combustion, and pressure relief valve safety.

Installation and Environmental Safety

Installation Clearance and Location Requirements

Specifies safe distances for vent terminals and installation area requirements.

Combustible Materials and Air Quality

Carbon Monoxide Prevention and Codes

Highlights carbon monoxide risks and emphasizes adherence to installation codes.

Usage, Maintenance, and Freezing Safety

Electrical, Maintenance, and Unit Coverage Safety

Preventing Damage from Freezing

Automatic Freeze Prevention System

Manual Freezing Protection Measures

Provides steps for protecting the unit and plumbing in extremely cold conditions.

Draining Procedure for Long-Term Storage

Troubleshooting Common Issues

Initial Operation and Ignition Problems

Temperature and Flow Rate Issues

Addresses concerns about water temperature, flow rate, and heating performance.

Hot Water Volume and Alarm Problems

Error Code Diagnosis and Resolution

Explains how to interpret and resolve specific error codes shown on the remote controller.

This document is an owner's guide for the Noritz Tankless Gas Water Heater, Model N-0751M. It provides critical safety information, operational instructions, maintenance guidelines, and technical specifications for the device.

Function Description:

The Noritz N-0751M is a tankless gas water heater designed to provide on-demand hot water. It is a power-vented model suitable for both indoor and outdoor wall-mounted installations. Unlike traditional tank water heaters, it does not store hot water, heating it only when a hot water fixture is opened. This design aims to provide a continuous supply of hot water and potentially save energy by avoiding standby heat loss. The unit is equipped with an automatic ignition device, eliminating the need for a pilot light.

Important Technical Specifications:

Model Name: N-0751M
Installation Type: Indoor/Outdoor, Wall Hanging, Power Vented
Ignition: Direct Ignition
Operating Pressure: 15-150 psi
Minimum Flow Rate: 0.5 GPM (gallons per minute)
Dimensions: 23.6" (Height) x 13.8" (Width) x 9.4" (Depth)
Weight: 47 lbs.
Water Holding Capacity: 0.2 Gallon
Connection Sizes: 3/4" for Water Inlet, Hot Water Outlet, and Gas Inlet
Power Supply: 120 VAC (60Hz), less than 2 amperes
Consumption: NG: 62W, LP: 75W (Freeze Prevention: 145W)
Materials: Casing made of Zincified Steel Plate/Polyester Coating, Flue Collar of Stainless Steel, Heat Exchanger of Copper Sheeting/Copper Tubing
Safety Devices: Flame Rod, Thermal Fuse, Lightning Protection Device (ZNR), Electric Leakage Prevention Device (GFCI), Overheat Prevention Device, Freezing Prevention Device, Fan Rotation Detector
Maximum Performance: 199,900 btuh (for both NG and LP)
Minimum Performance: 12,000 btuh (for both NG and LP)
Maximum Hot Water Capacity (45°F Rise): 7.5 Gal./min.
Capacity Range: 0.5-9.8 Gal./min.
Temperature Settings: 100-150°F (in 5°F intervals), 160, 170, 180°F (in 10°F intervals) (14 Options)
Default Temperature Options: 120, 130, 140, 180°F (Original is 120°F)
Elevation Limit: Approved for installation up to 4500 ft. above sea level. Higher elevations require contacting Noritz America.

Usage Features:

The water heater is controlled via a remote controller (RC-7649M) which displays the current temperature, burner status, and error codes.

Power On/Off: A dedicated button on the remote controller turns the heater on and off.
Temperature Setting: Users can adjust the desired hot water temperature using UP/DOWN buttons. The display flashes for 10 seconds and emits a tone when setting to 125°F or higher as a high-temperature warning, emphasizing the risk of scalding.
Flow Meter Alarm: This feature allows users to set an alarm to sound when a specific volume of water (in gallons) has been dispensed, useful for filling bathtubs. Settings range from 10-60 gallons (in 5-gallon intervals), 70-100 gallons (in 10-gallon intervals), or 990 gallons (to disable the alarm).
Muting the Remote Controller: The remote controller's button press sounds can be muted by holding the Power On/Off button for five seconds. However, the flow meter alarm and high-temperature warning tone cannot be muted.
Adjusting Maximum Output Temperature: The upper limit of the hot water supply temperature can be changed from the default 110°F to various settings up to 180°F, offering flexibility for different applications. This adjustment requires a specific sequence involving turning off the power, holding the flow meter alarm set button, and then using the setting buttons.
Initial Operation: Before first use, users must open the water supply valve, open and close a hot water fixture to confirm water availability, open the gas supply valve, and turn on the power.
Safety Warnings: The manual uses DANGER, WARNING, and CAUTION icons to highlight potential hazards, including scalding, fire, explosion from flammable vapors, and carbon monoxide poisoning. It advises against using the heater if the exhaust pipe is damaged, storing flammable materials nearby, or operating it with a damaged power cord.

Maintenance Features:

The manual outlines both periodic inspection and maintenance tasks to ensure the longevity and safe operation of the water heater.

Periodic Inspection:
- Check for laundry, newspapers, timber, oil, spray cans, and other combustible materials near the unit.
- Check for abnormal sounds during operation.
- Check for dust and soot in the exhaust vent or exhaust vent terminal.
- Check for dust or debris in the air inlet.
- Check for abnormalities in external appearance, discoloration, or flaws.
- Check for proper operation of the pressure relief valve.
- Check for water leaks from the equipment and piping.
Equipment Maintenance: Wipe the outside surface with a wet cloth and dry. Use a neutral detergent for stains.
Remote Controller Maintenance: Wipe the surface with a wet cloth. Avoid benzene, oil, or fatty detergents to prevent deformation. Keep it as dry as possible.
Water Drain Valve (with Water Filter) Maintenance: If debris clogs the filter, it can affect hot water flow. The process involves closing the water supply, opening all hot water fixtures, removing drain plugs, taking out the water drain valve (with filter), cleaning it with a brush under running water, replacing it, closing drain plugs, and opening the water supply.
Preventing Damage from Freezing: The unit has an automatic freeze-prevention heater, but external plumbing needs protection. For extremely cold temperatures (below -30°F indoor or -4°F outdoor), specific measures include turning off power, closing the gas valve, and keeping a small stream of hot water running from a fixture. If the unit is unused for long periods, draining the water is recommended.
Troubleshooting: The manual provides a comprehensive troubleshooting guide for common issues like no hot water, incorrect temperature, flow meter alarm problems, and error codes (e.g., "11" for ignition error, "90" or "99" for abnormal combustion/low gas supply pressure).
Optional Maintenance (Isolation Valves): Isolation valves, available as an accessory from Noritz, facilitate full diagnostic testing and easy flushing of the system. They include two full port isolation valves and a pressure relief valve for the hot side.
Warranty and Service: A warranty registration card is included separately. Noritz will stock repair and maintenance parts for ten years from the original installation date. Reinstallation in a different location or with a different gas type requires consulting Noritz.