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15

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 psig (3.5 kPa).  We do not recommend pressure testing in excess of ½ psig (3.5kPa). 

If it must be done, the appliance and its individual shutoff valve must be completely disconnected 

from the gas supply piping system during the test process.

Pipe Sizing/Flexible Connectors 

A gas shutoff valve must be installed on the supply line. Gas flex lines are not recommended unless 

the minimum inside diameter is ¾” or greater and the rated capacity of the connector is equal to or 

greater than the BTU capacity of the water heater.  Gas piping shall be in accordance with local utility 

company requirements and/or in the absence of local codes, use the latest edition of National 

Fuel Gas Code (NFPA54GC), ANSI Z223.1. In Canada, use the latest edition of CSA B149.1, 

National Gas and Propane installation code. Size the gas line according 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” WC

Max 10.5” WC

LP Gas Supply Pressure

Min 8” WC

Max 14” WC

Reference Tools & Sample Calculations

The tables and samples below are for reference only. The professional sizing and installing the gas 

line should always run the appropriate calculations before all installations.

CAUTION

Which Table to Use

•  For NG installations with the initial supply pressure at point of delivery (at the meter, for example) is 

less than 8” WC, use the 0.5” WC pressure drop table (Table 1). 

•  For NG installations with the initial supply pressure at point of delivery is greater than or equal to 8” 

WC, use the 3.0” pressure drop table (Table 2). 

•  For all LP installation use (Table 3)

The inlet pressure must be at least 5” WC for NG or 8” WC for LP for all appliances in the gas system.

If the inlet gas pressure drops below 5” WC for NG or 8” WC for LP, the heater may continue to operate, 

but the other appliances in the house may experience flame loss or ignition failure, which can result in gas 

leakage into the home.  Refer to the NFPA 54 for details. 

Please contact Noritz for details. For corrugated stainless steel tubing (CSST) capacity tables, please 

consult with the manufacturer.

Содержание GQ-2457WS-FFA US

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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