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•  Avoid installation above gas ranges or stoves.
•  Avoid installation between the kitchen fan and stove. If oily 

fumes or a large amount of steam are present in the installation 

location, take measures to prevent the fumes and steam from 

entering in the equipment.

•  Install in a location where the exhaust gas flow will not be af

-

fected by fans or range hoods.

•  Take care that noise and exhaust gas will not affect neighbors.  

Avoid installation on common walls as the unit will make some 

operational noises while it is running.

• 

Before installing, make sure that the exhaust flue termination will 

have the proper clearances according to 

the National Fuel Gas 

Code (ANSI Z223.1-latest edition) or the Natural Gas and Propane 

Installation Code (CSA B149.1).

•  If the unit is installed in a location with very high humidity, condensate 

may form inside the unit and/or cause incomplete combustion, 

damage to the  electrical components, or electric leakage.

State of California: The water heater must be braced, anchored or strapped to avoid moving during an 

earthquake.  Contact local utilities for code requirements in your area or call: 1-866-766-7489 and re

-

quest instructions.

Be sure to do

Prohibited

Prohibited

CAUTION

The Commonwealth of Massachusetts: The water heater can be used for hot water only and not in a 

combination of domestic and space heating.

For Venting Manufacturers Requirements, see websites listed below:

Noritz N-Vent 

www.noritz.com

•  The water heater is designed for indoor installation only. Never install it 

outdoors or in a bathroom, it may be damaged or a fire may be caused.

•  Consult with the customer concerning the location of installation.
• 

Install the water heater in an area that allows for the proper clearances 

to combustible and noncombustible construction. Consult the rating 

plate on the appliance for proper clearances.

•  Do not install the water heater in a place where it may be threatened by 

falling objects, such as under shelves.

•  The water heater must be installed in a place where supply and exhaust 

pipes can be installed as directed.

•  Do not install the water heater where the exhaust will blow on outer walls 

or material not resistant to heat. Also consider the surrounding trees and 

animals.

The heat and moisture from the water heater may cause discoloration of 

walls and resinous materials, or corrosion of aluminum materials.

Prohibited

Summary of Contents for GQ-2457WS-FFA US

Page 1: ...e 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 acco...

Page 2: ...bow Part No Description CRCAI 1 F CAIP Support Strap CVP 45ELB CRF P Standard Horizontal Kit FP 5 OUT CRF 20 Part No Description Roof Flashing Adapter A CRFB 55 Adjustable 90 Elbow 90 Elbow Straight S...

Page 3: ...troller to only one of the units When quick connecting with a NR83 DVC model the remote controller must be connected to the NR83DVC GQ 2457WS FFA US unit System Diagram Insulate the hot wa ter piping...

Page 4: ...ng With a Solar Pre Heater Using this unit with a solar pre heater can lead to unpredictable output temperatures and possibly scalding If absolutely necessary use mixing valves to ensure output temper...

Page 5: ...lfur ethylene compounds acids are present Using the incorrect voltage may result in fire or cracking Avoid installation in places where dust or debris will accumulate Dust may accumulate and reduce th...

Page 6: ...ode requirements in your area or call 1 866 766 7489 and re quest instructions Be sure to do Prohibited Prohibited CAUTION The Commonwealth of Massachusetts The water heater can be used for hot water...

Page 7: ...est edition for detailed requirements WARNING Item Distance from combustibles Maintain the following clearances from both combustible and non combustible materials Check Illustration In order to facil...

Page 8: ...I Z223 1 NFPA 54 National Fuel Gas Code A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings Permitted o...

Page 9: ...s for the remaining four screws 7 Hang the unit again by the first screw and then insert and tighten the remaining four screws 8 Take waterproofing measures so that water does not enter the building f...

Page 10: ...ter 8 Vent Pipe Installation The venting system shall be installed in accordance with the water heater manufacturer s instructions and if applicable the venting system manufacturer s instructions This...

Page 11: ...eater before changing the dip switches Failure to perform this step will result in a 73 code displayed on the remote controller and a cease in operation If this occurs disconnect then reconnect power...

Page 12: ...ulate protect the vent termination from blockage by snow drifts or damage from snow falling off of roofs Support the vent pipe with hangers at a minimum of every 7 2 1m All piping must be fully suppor...

Page 13: ...te at least 6 1 8m from the combus tion air intake of any appliance and 3 0 9m from any other building opening gas utility me ter service regulator etc Enclose exterior vent systems below the roof lin...

Page 14: ...he installer The installer must be professionally trained to do such work and must always follow all local and national codes and regulations Gas line sizing calculations must be performed for every i...

Page 15: ...ding to total btuh demand of the building and length from the meter or regulator so that the following supply pressures are available even at maximum demand WARNING Natural Gas Supply Pressure Min 4 W...

Page 16: ...45 13 5m Use 50 15m 175 000 Btuh requires 1 Outlet E 25 7 5m Use 30 9m 180 000 Btuh requires 3 4 Section 4 45 13 5m Use 50 15m 355 000 Btuh requires 1 1 4 Natural Gas Meter Noritz Tankless Gas Water...

Page 17: ...t each appliance to verify all appliances are receiving a minimum of 5 WC for NG or 8 WC for LP If all appliances are not receiving the minimum inlet pressure the gas piping system may need to be chan...

Page 18: ...em or components previ ously used with a nonpotable water heating appliance When water is required in one part of the system at a higher temperature than in the rest of the system means such as a mixi...

Page 19: ...r on the inlet If this is not done local boiling will occur inside the water heater causing abnormal sounds and decreasing the durability of the heat exchanger Freeze Prevention Freezing is prevented...

Page 20: ...m 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...

Page 21: ...nd then the other to the circulating pump 4 Connect the drain hose H2 to the circulating pump 5 Connect the drain hose H3 to the drain valve V4 6 Pour 1 gallon of and gallon water into the bucket Nori...

Page 22: ...ushing solution through the water heater for 1 hour at a rate of 1 5 gallons per minute or more 5 The code C60 is displayed on the Remote Controller when the water heater detects the flow of the flush...

Page 23: ...9 Open the gas supply valves and water outlet valves 10 Check for correct operation of the water heaters is displayed when the Main Water Heater s blue connector is connected is displayed when the Sub...

Page 24: ...11 3 L min Adjust as necessary to prevent cycling 5 If the system requires water for space heating at a higher temperature than for other uses means such as a mixing valve shall be provided to temper...

Page 25: ...eater will not activate resulting in possible freezing damage Do not let the power cord contact the gas piping Tie the redundant power cord out side the water heater Putting the redundant length of co...

Page 26: ...to the water heater 3 Press the Flow Meter Alarm Set Button and hold it in for 2 seconds or more 4 Press the Flow Meter Alarm Set Button until the remote controller displays item number 12 5 Press Set...

Page 27: ...his unit can be programmed so that it will default to one of three temperatures if the remote controller is removed 140 F 60 C 130 F 54 C 125 F 52 C To change the default temperature adjust the dip sw...

Page 28: ...om a wall circuit to the pump 5 Replace the front cover Pump Wiring This feature is not available when using the Quick Connect Multi System feature Relay connection with larger pumps 85 W 1 Locate and...

Page 29: ...nto the unit 4 Plug the connector on the Quick Connect Cord to the receptacle inside the unit 5 Attach the ground wire of the Quick Connect Cord to the terminal block fixing plate If the ground wire i...

Page 30: ...r normal the burner may need to be cleaned by qualified service technician Do not obstruct the flow of combustion and ventilation air The pressure relief valve must be operated once a year to ensure t...

Page 31: ...rol manual valve clockwise to the off position Should overheating occur or the gas supply fail to shut off turn off the manual control valve to the appliance Handling after trial operation If the unit...

Page 32: ...3 9 100mm 2 8 70mm 1 4 36mm HEIGHT OF EACH FITTINGS FROM BOTTOM OF CASE 24 6 626mm 22 3 567mm 1 0 26mm 4 4 113mm HOT WATER OUTLET COLD WATER INLET GAS INLET 1 8 45mm 1 9 49mm 2 2 56mm AIR INLET FLUE C...

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