Noritz N-0631S User Manual

SAR8583-2
Rev. 03/08
Model N-0631S
N-0631S-OD
N-0531S
N-0531S-OD
TANKLESS GAS WATER HEATER
Owner’s Guide
NORITZ America Corporation
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using, please:
Read this manual completely for operation instructions.
Completely fill out the warranty registration card (included separately) and
mail the detachable portion to Noritz America Corporation.
Keep this manual (and the remainder of the warranty registration card) where it
can be found whenever necessary.
Installation must conform with local codes, or in the absence of local codes,
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
Noritz America reserves the right to discontinue, or change at any time, the
designs and/or specifications of its products without notice.
Low NOx
Approved by
SCAQMD
CERTIFIED
R
- Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
- Installation and service must be performed by a qualified installer, service
agency or the gas supplier.
If the information in this manual is not followed exactly, a fire or explosion
may result causing property damage, personal injury, or death.
WARNING
*SAR8583 T*

Noritz N-0631S Specifications

General

Type	Tankless
Fuel Type	Natural Gas
Maximum BTU Input	63, 000 BTU/h
Flow Rate	6.3 GPM
Energy Factor	0.82
Weight	38 lbs
Efficiency	82%
Energy Source	Natural Gas
Input BTU/h	63, 000 BTU/h
Venting	Direct Vent
Warranty	12 years heat exchanger, 5 years parts

Summary

Important Safety Information-1

Flammable vapor hazards

Warns about flammable vapors, storage, and properties.

Scalding risks from hot water

Warns about burns from hot water (>125°F) and vulnerable groups.

Important Safety Information-2

Exhaust vent terminal safety

Specifies safe locations for exhaust vents to prevent CO poisoning.

Clearance and combustible material rules

Advises on clearances and avoiding combustibles near the unit.

Gas/power supply matching

Indoor installation clearances

Prohibited locations for installation

Important Safety Information-3

Electrical grounding and cord safety

Stresses grounding importance and safe handling of power cords.

Unit operation and covering restrictions

Freezing prevention advice

Advises on preventing freezing damage during non-use or cold weather.

Initial Operation

Valve and power preparation steps

Details opening water/gas valves and turning on power.

How to Use (Using the remote controller)

Power on and display basics

Temperature setting and warnings

Explains setting temperature and high-temperature warning system.

Adjusting the Maximum Output Temperature

Procedure for setting max temperature

Steps to turn off power, press alarm set, and use setting buttons.

Preventing Damage from Freezing

Automatic freeze protection mechanism

Explains the unit's automatic freeze prevention and its limits.

Cold weather operation advice

Advises running hot water during extreme cold to prevent freezing.

Draining the Water Heater

Water draining process for storage

Step-by-step guide to drain the water heater for long-term storage.

Procedures for unit restart

Troubleshooting-1

Initial operation and ignition issues

Addresses problems with unit ignition and failing to ignite.

Hot water temperature problems

Error Code and Flashing Light Checks

Unit abnormality light signals

Remote controller error code interpretation