Installation Manual
Canada
NORITZ AMERICA CORPORATION
TANKLESS GAS WATER HEATER
N-0751M N-0751M-OD
(Indoor/Outdoor Installation)
(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.
DANGER |
DANGER indicates an imminently hazardous situation which, |
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if not avoided, will result in death or serious injury. |
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WARNING |
WARNING indicates a potentially hazardous situation which, |
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if not avoided, could result in death or serious injury. |
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CAUTION |
CAUTION indicates a potentially hazardous situation which, |
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if not avoided, may result in minor or moderate injury. |
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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 |
Disconnect |
Ground |
Be sure to do |
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Power |
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CAUTION
Requests to Installers
•In order to use the water heater safely, read this installation manual carefully, and follow the installation 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.
CERTIFIED
R
Low NOx
Approved by
SCAQMD
WS-06-9012
Rev. 01/07
Installation must conform with local codes, or in the absence of local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54latest edition and/or CSA B149.1, Natural Gas and Propane Installation Code (NSCNGPIC).
Noritz America reserves the right to discontinue, or change at any time, the designs and/or specifications of its products without notice.
1. Included Accessories |
The following accessories are included with the unit. |
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Check for any missing items before starting installation. |
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Part |
Shape |
Q’ty |
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Q’ty |
Tapping Screw |
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5 |
Cross Recessed |
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3 |
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Head Screw |
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(N-0751M only) |
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(N-0751M-OD only) |
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Owner's Guide, Warranty, |
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1 |
Remote Controller |
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Installation Manual |
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1 |
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each |
(See p. 21) |
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(this document) |
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Remote Controller |
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1 |
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Cord (3m(10')) |
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The accessories listed below are not
2. Optional Accessories included with the units, but may be necessary for installation.
Part |
Shape |
Q’ty |
Part |
Shape |
Q’ty |
Quick Connect Cord |
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Remote Controller |
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Cord (8m(26')) |
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Isolator Exp |
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Pipe Cover |
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(includes pressure |
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1 |
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relief valve) |
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[Outdoor installation only]
Remote Controller
1
Outdoor
Junction Box
[ N-0751M only ] |
[ N-0751M-OD only ] |
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Shape |
Q’ty |
Outdoor Vent Cap |
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1 |
(VC4(-1)) |
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Part |
Shape |
Q’ty |
Recess Box |
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(RB-4) |
1 |
2
3. Quick Connect Multi System Installation
•The Quick Connect Multi System allows the installation of two units together utilizing only the Quick Connect Cord.
The Quick Connect Cord is 2m (6'). long. Install the units 50 - 450mm (2-18") apart from each other to ensure the cord will be able to reach between the units. (See Typical Plumbing diagram). (If the distance between the two units is too great, not only will the cord not be able to reach, but the water temperature may also become unstable because of the difference in pipe length between the two units).
System Diagram
Quick Connect |
Cord |
Cord |
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Cord |
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Connector |
Connector |
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Typical Plumbing
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Union |
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Quick Connect |
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cord |
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Make this distance as short as possible. |
Pressure |
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Relief |
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* The hot water temperature will |
Valve |
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become unstable as the pipe |
Shutoff |
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length increases. |
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Valve |
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*When connecting two units, use only a single remote controller.
Terminal Block
Remote Controller |
Note: Connect the remote |
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controller to only one |
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of the units. |
Remote Controller Cord |
Gas Supply Piping |
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G |
Cold Water Supply |
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Hot Water |
Distance at center 400 - 800mm (16-32")
Distance on sides 50 - 450mm (2-18")
Union |
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Union |
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Gas Valve |
Shutoff |
Shutoff Valve |
Valve |
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Hot Water |
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Cold Water |
Leave enough clearance around the plumbing to |
Size the piping to allow for the maximum |
apply insulation. It will be necessary to add |
flow rates of the units. |
bends to the piping to ensure that this clearance |
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is available. |
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•Insulate the hot water piping to prevent heat loss. Insulate and apply heating materials to the cold water supply piping to prevent heat loss and freezing of pipes when exposed to excessively cold temperatures.
3
4. Before Installation
DANGER
Checkup [For indoor installation only]
• Check the fixing brackets and vent pipe yearly for damage or wear. Replace if necessary.
Check the Gas
WARNING
• |
Check that the rating plate indicates the |
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N-0751M |
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correct type of gas. |
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Natural Gaz Naturel |
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12,000 BTU |
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199,900 BTU |
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• |
Check that the gas supply line is sized for |
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202 |
765 |
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0.65 |
2.55" |
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4.0 |
10.5" |
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199,900 Btuh for this unit. |
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0 - 2,000 Ft. (0 - 610 m) 2,000 - 4,500 Ft.* (610 - 1,370 m*) |
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Check the Power |
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• The power supply required is 120V AC, at 60Hz. |
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Using the incorrect voltage may result in fire or electric shock. |
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Use Extreme Caution if Using 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 temperatures do not get to scalding levels. Do not use a solar pre-heater with the quick-connect multi-system.
CAUTION
Do Not Use Equipment for Purposes Other Than Those Specified
•Do not use for other than increasing the temperature of the water supply, as unexpected accidents may occur as a result.
Check Water Supply Quality
•If the water supply is hard, acidic or otherwise impure, treat the water with approved methods in order to ensure full warranty coverage.
4
5. Choosing Installation Site
*Locate the appliance in an area where leakage from the unit or connections will not result in damage to the area adjacent to the appliance or to the lower floors of the structure. When such locations cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance. The pan must not restrict combustion air flow.
DANGER
[For indoor installation only]
•Install the exhaust vent so that there are no obstacles around the termination and so that exhaust can't accumulate. Do not enclose the termination with corrugated metal or other materials.
[For outdoor installation only]
• Do not enclose the termination with corrugated metal or other materials.
This will cause carbon monoxide |
Indoor |
poisoning and a potential fire hazard.
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.
Using the incorrect voltage may result in fire or cracking.
•Avoid installation in places where dust or debris will accumulate.
Dust may block the air-supply opening, causing the performance of the device fan to drop and incomplete combustion to occur as a result.
•Avoid installation in places where special chemical agents (e.g., hair spray or spray detergent) are used.
Ignition failures and malfunction may occur as a result.
•Carbon Monoxide Poisoning Hazard. Do not install this water heater in a mobile home, recreation vehicle or on a boat.
Prohibited
[Indoor installation]
Prohibited
[Outdoor installation]
5
CAUTION
•Consult with the customer concerning the location of installation.
•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.
•Install in a location where the exhaust gas flow will not be affected by fans or range hoods.
•Take care that noise and exhaust gas will not affect neighbors.
•Before installing, make sure that the vent termination (or the vent
cap in an outdoor installation) will have the proper clearances |
Prohibited |
according to the National Fuel Gas Code (ANSI Z223.1). |
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[For outdoor installation only]
•Install the water heater in a location where it is free from obstacles and stagnant air.
•Do not install the water heater near staircases or emergency exits.
•Do not locate the vent termination directed towards a window or any
other structure which has glass or wired glass facing the termination.
• Avoid installation where the unit will be exposed to excessive winds.
[For indoor installation only]
•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.
[For N-0751M only]
•Make sure that the location allows installation of the exhaust vent as specified.
•For outdoor installation, use the outdoor vent cap.
If it is necessary to vent above the roof line in an outdoor installation, also use the base of the vent cap for rain protection.
Prohibited
Be sure to do
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: 1-800-456-9805 and request instructions.
6
6. 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 – latest edition. In Canada, see NSCNGPIC for detailed requirements.
[ For N-0751M ]
Item
From Heater
Required Clearances
Cooking Equipment
ofSecuring forspacerepair/inspection
Check
•Maintain the following clearance from both combustible and non-combustible materials.
•If the unit will be installed in the vicinity of a permanent kitchen range or stove that has the possibility of generating steam that contains fats or oils, use a dividing plate or other measure to ensure that the unit is not exposed to air containing such impurities.
*The dividing plate should be of noncombustible material of a width greater than the water heater.
•If possible, leave 200mm (8") or more on either side of the unit to facilitate inspection.
•If possible, leave 600mm (24") or more in front of the unit to facilitate maintenance and service if necessary.
Illustration
300mm (12") Indoor
900mm (36") Outdoor
600mm (24") Outdoor
100mm (4") Indoor
50mm (2") Indoor
600mm (24") Outdoor
Exhaust hood |
Dividing plate |
Water |
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heater |
Range |
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Min: 75mm (3")
200mm
(8") or Min: 75mm (3") more
200mm (8") or
600mm more (24") or more
7
[ For N-0751M -OD]
Item |
Check |
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• Maintain the following clearance from both combustible |
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and non-combustible materials. |
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Heater |
* ( ) indicates the distance when installing a heat insulat- |
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ing board (incombustible material other than metal, with |
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From |
thickness of 2.5mm (0.1") or more) or "section of build- |
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ing effectively finished with incombustible material." |
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Note, however, that combustion failure may occur to the |
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ClearancesRequired |
unit as exhaust gas reflects from the wall. Provide clear- |
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ance of 600mm (24") or more in the front of the unit to |
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facilitate inspection and repair. |
installation |
• |
When installing the unit in a common side corridor, provide |
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(84") from the corridor floor. |
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a clearance of 1175mm (47") or more in front of the unit. |
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• Set the bottom edge of the exhaust port about 2100mm |
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ofarea |
• When installing the unit on a balcony, etc., secure an |
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the |
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evacuation route of 600mm (24") or more in width. |
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Surrounding |
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• Provide clearance of 600mm (24") or more in front of the |
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unit to facilitate inspection and repair. Do install the unit |
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such as the wall of the second floor where the unit is out |
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of reach. |
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600mm (24") |
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combustible |
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(300mm (12")) |
combustible |
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or more |
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10mm (0.4") |
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or more |
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combustible |
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combustible |
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900mm |
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combustible |
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(36") or more |
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150mm |
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(6") or more |
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150mm |
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(6") or more |
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1175mm (47") |
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or more |
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about |
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Handrail |
2100mm (84") |
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common side |
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corridor |
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600mm (24")
or more
Handrail
balcony, etc.
8
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 and in Canada, in accordance with NSCNGPIC.
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Vent Terminal |
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Area Where Terminal |
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Air Supply Inlet |
is Not Permitted |
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Clearance |
Indoor Installation |
Outdoor Installation |
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(See p.10) |
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(See p.10, 11) |
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A= |
Above grade, veranda, porch, deck, |
300mm (12") [300mm (12")] |
300mm (12") [300mm (12")] |
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or balcony |
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B= |
Window or door that may be opened |
1.2m (4') below or to the side of |
300mm (12") [900mm (36")] |
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opening, or 0.3m (1') above |
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opening [900mm (36")] |
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C= |
Permanently closed window |
* |
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* |
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Vertical clearance to ventilated soffit |
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D= |
located above the terminal within a |
* |
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horizontal distance of 0.6m (2') from |
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the center of the terminal |
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E= |
Unventilated soffit |
* |
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F= |
Outside corner |
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G= |
Inside corner |
* |
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H= |
Each side of center line extended |
0.9m (3') within a height 4.5m (15') |
0.9m (3') within a height 4.5m (15') |
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above meter/regulator assembly |
above meter/regulator assembly |
above meter/regulator assembly |
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I= |
Service regulator vent outlet |
0.9m (3') |
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0.9m (3') |
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Nonmechanical air supply inlet or |
1.2m (4') below or to the side of |
300mm (12") [900mm (36")] |
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J= |
combustion air inlet to any other |
opening, or 0.3m (1') above |
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appliance |
opening [900mm (36")] |
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K= |
Mechanical air supply inlet |
0.9m (3') above if within |
0.9m (3') above if within |
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3m (10') [1.8m (6')] |
3m (10') [1.8m (6')] |
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L= |
Above paved sidewalk or paved |
[2.1m *** (7' ***)] |
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[2.1m *** (7' ***)] |
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driveway located on public property |
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M= |
Under veranda, porch, deck, or |
*[300mm (12") - Canada Only****] |
*[300mm (12") - Canada Only****] |
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balcony |
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[ ]= indicates clearances required in Canada
*Maintain clearances in accordance with local installation codes and the requirements of the gas supplier
***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 only if veranda,porch,deck,or balcony is fully open on a minimum of two sides beneath the floor.
9
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 and in Canada, in accordance with NSCNGPIC.
[ For N-0751M]
Maintain the following clearances to any opening in any building:
In- |
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• 1.2m (4') below, 1.2m (4') horizontally from, |
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or 0.3m (1') above any door, operable win- |
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is |
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dow, or gravity air inlet into any building. |
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HeaterWhen |
Indoors |
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0.9m (3') above any forced air inlet within |
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3m (10'). |
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Clearances |
stalled |
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Vent |
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• 0.3m (1') below, 0.3m (1') horizontally from, |
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isIn |
Cap |
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or 0.3m (1') above any door, operable |
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Heater |
Venta |
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window, or gravity air inlet into any building. |
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0.9m (3') above any forced air inlet within |
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VentClearancesWhen |
stalledOutdoorsWith |
3m (10'). |
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(Noritz vent cap) |
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Illustration
1.2m (4')
1.2m (4')
0.3m (1')
0.9m (3')
0.3m (1') 0.3m (1')
0.3m (1')
0.9m (3')
*For Installations in Canada, clearances are as follows: To windows, doors, & gravity air inlets: 900mm (36"). To forced air inlets: 1.8m (6'). These clearance requirements hold true for all of the above situations: Indoor, Outdoor w/vent cap.
10
[ For N-0751M- OD]
Maintain the following clearances to any opening in any building:
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• 0.3m (1') below, 0.3m (1') horizontally from, |
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ClearancesOpeningOutdoorto |
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or 0.3m (1') above any door, operable |
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window, or gravity air inlet into any building. |
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BuildingAnyinto |
0.9m (3') above any forced air inlet within |
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3m (10'). |
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• 0.3m (1') below, 0.3m (1') horizontally from, |
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is |
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or 0.3m (1') above any door, operable |
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window, or gravity air inlet into any building. |
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HeaterWhen |
BoxRecess |
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0.9m (3') above any forced air inlet within |
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3m (10'). |
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VentClearances |
Installedina |
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(recess box installation with cover removed)
Illustration
0.3m (1')
0.3m (1')
0.3m (1')
0.9m (3')
0.3m |
0.3m (1') |
(1') |
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0.3m |
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(1') |
0.9m (3') |
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*For Installations in Canada, clearances are as follows: To windows, doors, & gravity air inlets: 900mm (36"). To forced air inlets: 1.8m (6').
11
7. Installation
Securing to the wall
• |
The weight of the device will be applied to the wall. If the strength of the wall is not suffi- |
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cient, 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 |
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Be sure to do • |
be damaged and may become highly dangerous. |
Install the unit on a vertical wall and ensure that it is level. |
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Item
Locating Screw Holes
Mounting
Structure |
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Elevations |
(2,000'). |
Installationsat |
Above610m |
Check
CAUTION
•When installing with bare hands, take caution to not inflict injury.
•Be careful not to hit electrical wiring, gas, or water piping while drilling holes.
1.Drill a single screw hole, making sure to hit a stud.
2.Insert and tighten the screw and hang the unit by the upper wall mounting bracket.
3.Determine the positions for the remaining four screws (two for the top bracket and two for the bottom), and remove the unit.
4.Drill holes for the remaining four screws.
5.Hang the unit again by the first screw, and then insert and tighten the remaining four screws.
6.Take waterproofing measures so that water does not enter the building from screws mounting the device.
•Make sure the unit is installed securely so that it will not fall or move due to vibrations or earthquakes.
•If this water heater is being installed at an elevation of 610m (2,000') or higher, disconnect the connector labeled "High Elevation Disconnect" as illustrated on the right. This connector is located inside the unit.
•Disconnect power to the water heater before disconnecting this connector. 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 to the water heater to reset the system.
Illustration
Location of Screw Hole
Mounting Bracket (upper)
Locating Screw Holes
Tapping Screw
ELEVATION
DISCONNECT
HIGH
12
8. Vent Pipe Installation (Indoor Installation Only)
[ For N-0751M]
WARNING
CARBON MONOXIDE POISONING
Follow all vent system requirements in accordance with relevant local or state regulation, or, in the absence of local or state code, in the U.S. to the National Fuel Gas Code ANSI
Be sure to do |
Z233.1/NFPA 54 – latest edition, and in Canada, in accordance with NSCNGPI. |
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Vent Piping
•Use only UL listed category III vent materials.
•Follow the vent pipe manufacturer's installation instructions.
Pipe diameter |
100mm (4") |
No. of Elbows |
Max. Straight Vent Length |
3 |
4.6m (15') |
2 |
8.2m (27') |
1 |
11.7m (39') |
•Make the vertical section of the exhaust vent as short as possible.
•Maintain the same vent pipe diameter from the heater flue to the vent termination.
Clearances
Manufacturer and |
Enclosed |
Unenclosed |
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Product |
Hor. |
Vert. |
Hor. |
Vert. |
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Noritz N-Vent |
250mm (10") (sides) |
100mm |
75mm |
75mm |
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150mm (6") (bottom) |
(4") |
(3") |
(3") |
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375mm (15") (top) |
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Protech FasNSeal |
200mm (8") (sides) |
100mm |
75mm |
75mm |
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100mm (4") (bottom) |
(4") |
(3") |
(3") |
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300mm (12") (top) |
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Protech FasNSeal W2 |
150mm |
100mm |
75mm |
75mm |
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(6") |
(4") |
(3") |
(3") |
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HeatFab SafTVent |
150mm |
150mm |
50mm |
50mm |
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(6") |
(6") |
(2") |
(2") |
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Z-Flex Z-Vent |
200mm |
100mm |
25mm |
25mm |
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(8") |
(4") |
(1") |
(1") |
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Flex-L-StaR-34 |
200mm |
100mm |
25mm |
25mm |
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(8") |
(4") |
(1") |
(1") |
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These clearances are subject to change.
Refer to the UL listing for the proper clearances.
•The first vertical run from the top of the heater should be no longer than 0.9m (3').
•Make sure vent pipe is gas tight and will not leak. Use silicon sealant wherever necessary.
•Do not common vent or connect more than one appliance to this venting system.
•The total vent length including horizontal & vertical vent runs should be no less than 0.9m (3').
•Do not place any dangerous objects at the end of the exhaust vent and check that vent pipe is not blocked in any way.
•Steam (smoke) or water drops may come out from the end of the exhaust pipe. Select the location for the end of the vent so that steam is not visible, and the vent is not wet with dripping water.
•If snow is expected to accumulate, take care the end of the pipe is not covered with snow or hit by falling lumps of snow.
•Consult the vent pipe manufacturer's installation instructions for chimney connections.
Appliance Adapters
•Use the following adapters to connect the unit to the venting system.
Manufacturer and
Product
Protech FasNSeal
HeatFab SafTVent
Z-Flex Z-Vent
Flex-L Star-34
13
Horizontal Vent Termination |
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• |
Terminate at least 300mm (12") above |
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Hanger |
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grade or above snow line. |
Elbow |
Straps |
• |
Terminate at least 2.1m (7') above a public |
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walkway, 1.8m (6') from the combustion air |
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Wall |
Termination |
intake of any appliance, and 0.9m (3') from |
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any other building opening, gas utility meter, |
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Slope vent Thimble |
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Downwards |
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service regulator etc. |
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• |
Terminate at least 0.9m (3') above any |
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**0.3m (1') Min. - |
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forced air inlet within 3m (10'), 1.2m (4') be- |
Appliance |
0.9m (3') Max. |
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low, 1.2m (4') horizontally from or 0.3m (1') |
Adapter* |
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above any door, window, or gravity air inlet |
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* Adapter not required when |
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into any building per National Fuel Gas Code |
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ANSI Z223.1/NFPA 54. |
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using Noritz N-Vent. |
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** 0.3m (1') minimum recommended, |
• Slope the horizontal vent 1/4" downwards |
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but not required. Avoid installing |
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for every 300m (12"). |
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elbow directly on flue. |
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• Use a condensation drain if necessary. |
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• In the Commonwealth of Massachusetts a |
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carbon monoxide detector is required for all |
Vertical Vent Termination |
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side wall horizontally vented gas fuel equip- |
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ment. Please refer to Technical Bulletin TB |
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Rain |
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Cap |
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010606 for full installation instructions. |
Storm |
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Collar |
Roof |
• Terminate at least 1.8m (6') from the combus- |
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Flashing |
tion air intake of any appliance, and 0.9m (3') |
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Roof |
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from any other building opening, gas utility |
Jack |
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meter, service regulator etc. |
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Firestop/
Support
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Hanger |
Firestop |
Elbow |
Strap |
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Condensation |
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Drain (Install |
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**0.3m (1') Min. - |
According to |
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0.9m (3') Max. |
Local Codes) |
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Appliance |
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Adapter* |
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* Adapter not required when |
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using Noritz N-Vent. |
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** 0.3m (1') minimum recommended, |
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but not required. Avoid installing |
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elbow directly on flue. |
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•Enclose exterior vent systems below the roof line to limit condensation and protect against mechanical failure.
•When the vent penetrates a floor or ceiling and is not running in a fire rated shaft, a firestop and support is required.
•Terminate the vent system at least 0.6m (2') above, but not more than 1.8m (6') above the roof line, or according to the vent pipe manufacturer's instructions.
•Terminate the vent system at least 0.6m (2') above any portion of a building located within 3m (10') horizontally.
•Provide vertical support every 3.6m (12') or as required by the vent pipe manufacturer's instructions.
•Slope the horizontal vent 1/4" for every 300m (12") towards the drain tee.
•Do not vent straight upwards.
Always have a horizontal section of venting.
•Install a condensation drain in the horizontal section of the venting.
14
Combustion Air |
Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1 and |
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in Canada, in accordance with NSCNGPIC. |
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• Provide two permanent openings to allow |
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circulation of combustion air. |
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250mm (10") |
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• Make each opening 199 square inches if they |
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provide indoor air, and 100 square inches for |
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500mm (20") |
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outdoor air. |
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• If the unit is installed in a mechanical closet, provide a 600mm (24") clearance in front of the unit to the door.
• If combustion air will be provided through a duct, size the duct to provide 60 cubic feet of fresh air per minute.
500mm (20")
250mm (10")
Openings supplying indoor air
15
9. Gas Piping
Follow the instructions from the gas supplier.
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1⁄2 psi (3.5 kPa).
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 1⁄2 psi (3.5 kPa).
The appliance and its gas connections must be leak tested before placing the appliance in operation.
The inlet gas pressure must be within the range specified. This is for the purposes of input adjustment.
In order to choose the proper size for the gas line, consult local codes or the National Fuel Gas Code ANSI Z223.1.
Gas Pressure
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:
Natural Gas Supply Pressure
Min. 4" WC
Max. 10.5" WC
LP Gas Supply Pressure
Min. 8" WC
Max. 14" WC
Measuring Gas Pressure
Gas Meter
Select a gas meter capable of supplying the entire btuh demand of all gas appliances in the building.
Gas Connection
•Do not use piping with a diameter smaller than the inlet diameter of the water heater.
•Gas flex lines are not recommended unless they are rated for 199,900 btuh.
•Install a gas shutoff valve on the supply line.
•Use only approved gas piping materials.
In order to check the gas supply pressure to the unit, a tap is provided on the gas inlet. Remove the hex head philips screw from the tap, and connect a manometer using a silicon tube.
In order to check the gas manifold pressure, a pair of taps are provided on the gas valve inside the unit.
The pressure can be checked either by removing the hex head philips screw and connecting a manometer with a silicon tube, or by removing the 1/8" NPT screw with an allen wrench and connecting the appropriate pressure gauge.
Sample Gas Line
Noritz Gas Water Heater
(199,900 Btuh) Barbecue
(50,000 Btuh)
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Outlet E |
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Outlet A |
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Clothes Dryer |
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3m (10') |
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(35,000 Btuh) |
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3m (10') |
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Outlet C |
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1.5m (5') |
Section 1 |
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Section 4 |
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Section 3 Section 2 |
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1.5m (5') |
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1.5m (5') |
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1.5m (5') |
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3m (10') |
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1.5m (5') |
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1.5m (5') |
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Outlet D |
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Outlet B |
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3m (10') |
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Gas Fireplace |
Gas Range Stove |
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(25,000 Btuh) |
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(65,000 Btuh) |
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Natural Gas |
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Meter |
**See next page for the pipe capacity charts. |
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Instructions
1.Size each outlet branch starting from the furthest using the Btuh required and the length from the meter.
2.Size each section of the main line using the length to the furthest outlet and the Btuh required by everything after that section.
Sample Calculation
Outlet A: 13.5m (45') (Use 15m (50')), 50,000 Btuh requires 1/2" Outlet B: 12m (40'), 65,000 Btuh requires 1/2"
Section 1: 13.5m (45') (Use 15m (50')), 115,000 Btuh requires 3/4" Outlet C: 9m (30'), 35,000 Btuh requires 1/2"
Section 2: 13.5m (45') (Use 15m (50')), 150,000 Btuh requires 3/4" Outlet D: 7.5m (25') (Use 9m (30')), 25,000 Btuh requires 1/2" Section 3: 13.5m (45') (Use 15m (50')), 175,000 Btuh requires 1" Outlet E: 7.5m (25') (Use 9m (30')), 199,900 Btuh requires 3/4" Section 4: 13.5m (45') (Use 15m (50')), 374,900 Btuh requires 1-1/4"
16
Gas Line Sizing for a Noritz Gas Water Heater
Adapted from UPC 1997
Maximum Natural Gas Delivery Capacity in Cubic Feet per Hour (0.60 Specific Gravity, 0.5" WC Pressure Drop)
Pipe |
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Length in Feet |
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Size |
3m (10') |
6m (20') |
9m (30') |
12m (40') |
15m (50') |
18m (60') |
21m (70') |
24m (80') |
27m (90') |
30m (100') |
37.5m (125') |
1/2" |
174 |
119 |
96 |
82 |
73 |
66 |
61 |
56 |
53 |
50 |
44 |
3/4" |
363 |
249 |
200 |
171 |
152 |
138 |
127 |
118 |
111 |
104 |
93 |
1" |
684 |
470 |
377 |
323 |
286 |
259 |
239 |
222 |
208 |
197 |
174 |
1 1/4" |
1404 |
965 |
775 |
663 |
588 |
532 |
490 |
456 |
428 |
404 |
358 |
1 1/2" |
2103 |
1445 |
1161 |
993 |
880 |
798 |
734 |
683 |
641 |
605 |
536 |
2" |
4050 |
2784 |
2235 |
1913 |
1696 |
1536 |
1413 |
1315 |
1234 |
1165 |
1033 |
2 1/2" |
6455 |
4437 |
3563 |
3049 |
2703 |
2449 |
2253 |
2096 |
1966 |
1857 |
1646 |
3" |
11,412 |
7843 |
6299 |
5391 |
4778 |
4329 |
3983 |
3705 |
3476 |
3284 |
2910 |
3 1/2" |
16,709 |
11,484 |
9222 |
7893 |
6995 |
6338 |
5831 |
5425 |
5090 |
4808 |
4261 |
4" |
23,277 |
15,998 |
12,847 |
10,995 |
9745 |
8830 |
8123 |
7557 |
7091 |
6698 |
5936 |
|
Contact the Gas Supplier for Btu/Cubic Ft. of the Supplied Gas. 1000 BTU/Cubic Ft. is a Typical Value |
Maximum Liquified Petroleum (Undiluted) Delivery Capacity in Thousands of Btuh (0.5" WC Pressure Drop)
Pipe |
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Length in Feet |
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Size |
3m (10') |
6m (20') |
9m (30') |
12m (40') |
15m (50') |
18m (60') |
21m (70') |
24m (80') |
27m (90') |
30m (100') |
37.5m (125') |
45m (150') |
60m (200') |
|
1/2" |
275 |
189 |
152 |
129 |
114 |
103 |
96 |
89 |
83 |
78 |
69 |
63 |
55 |
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3/4" |
567 |
393 |
315 |
267 |
237 |
217 |
196 |
185 |
173 |
162 |
146 |
132 |
112 |
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1" |
1071 |
732 |
590 |
504 |
448 |
409 |
378 |
346 |
322 |
307 |
275 |
252 |
213 |
1 |
1/4" |
2205 |
1496 |
1212 |
1039 |
913 |
834 |
771 |
724 |
677 |
630 |
567 |
511 |
440 |
1 |
1/2" |
3307 |
2299 |
1858 |
1559 |
1417 |
1275 |
1181 |
1086 |
1023 |
976 |
866 |
787 |
675 |
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2" |
6221 |
4331 |
3465 |
2992 |
2646 |
2394 |
2205 |
2047 |
1921 |
1811 |
1606 |
1496 |
1260 |
** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
Maximum Capacity of Flex TracPipeR in Cubic Feet per Hour of Natural Gas (0.60 Specific Gravity, 0.5" WC Pressure Drop)
Pipe |
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Length in Feet |
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Size |
3m (10') |
6m (20') |
9m (30') |
12m (40') |
15m (50') |
18m (60') |
21m (70') |
24m (80') |
27m (90') |
30m (100') |
45m (150') |
60m (200') |
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3/4" |
206 |
147 |
121 |
105 |
94 |
86 |
80 |
75 |
71 |
67 |
55 |
48 |
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1" |
383 |
269 |
218 |
188 |
168 |
153 |
141 |
132 |
125 |
118 |
94 |
82 |
1 |
1/4" |
614 |
418 |
334 |
284 |
251 |
227 |
209 |
194 |
181 |
171 |
137 |
116 |
1 |
1/2" |
1261 |
888 |
723 |
625 |
559 |
509 |
471 |
440 |
415 |
393 |
320 |
277 |
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2" |
2934 |
2078 |
1698 |
1472 |
1317 |
1203 |
1114 |
1042 |
983 |
933 |
762 |
661 |
Maximum Capacity of Flex TracPipeR in Thousands of Btuh Liquified Petroleum ( 0.5" WC Pressure Drop)
Pipe |
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Length in Feet |
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Size |
3m (10') |
6m (20') |
9m (30') |
12m (40') |
15m (50') |
18m (60') |
21m (70') |
24m (80') |
27m (90') |
30m (100') |
45m (150') |
60m (200') |
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3/4" |
325 |
232 |
191 |
166 |
149 |
136 |
126 |
118 |
112 |
106 |
87 |
76 |
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1" |
605 |
425 |
344 |
297 |
265 |
241 |
222 |
208 |
197 |
186 |
143 |
129 |
1 |
1/4" |
971 |
661 |
528 |
449 |
397 |
359 |
330 |
307 |
286 |
270 |
217 |
183 |
1 |
1/2" |
1993 |
1404 |
1143 |
988 |
884 |
805 |
745 |
696 |
656 |
621 |
506 |
438 |
|
2" |
4638 |
3285 |
2684 |
2327 |
2082 |
1902 |
1761 |
1647 |
1554 |
1475 |
1205 |
1045 |
** For reference only. Please consult gas pipe manufacturer for actual pipe capacities. TracPipe® is a registered trademark of Omega Flex.
Maximum Capacity for Gas Flex Connectors in Cubic Feet per Hour of Natural Gas (0.60 Specific Gravity, 0.5" WC Pressure Drop)
Pipe |
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Length in Inches |
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Size |
300mm (12") |
600mm (24") |
900mm (36") |
1200mm (48") |
1500mm (60") |
1800mm (72") |
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1/2" |
180 |
150 |
125 |
106 |
93 |
86 |
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3/4" |
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290 |
255 |
215 |
197 |
173 |
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1" |
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581 |
512 |
442 |
397 |
347 |
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1 1/4" |
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1470 |
1200 |
1130 |
960 |
930 |
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Maximum Capacity for Gas Flex Connectors in Thousands of Btuh Liquified Petroleum ( 0.5" WC Pressure Drop)
Pipe |
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Length in Inches |
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Size |
300mm (12") |
600mm (24") |
900mm (36") |
1200mm (48") |
1500mm (60") |
1800mm (72") |
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1/2" |
288 |
240 |
200 |
169 |
149 |
137 |
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3/4" |
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465 |
409 |
344 |
315 |
278 |
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1" |
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930 |
825 |
708 |
638 |
556 |
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1 1/4" |
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2352 |
1920 |
1808 |
1536 |
1488 |
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** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
17
Installation and service must be performed by a qualified plumber. In the 10. Water Piping Commonwealth of Massachusetts, this product must be installed by a licensed
plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248 CMR Sections 2.00 and 5.00. Observe all applicable codes.
This appliance suitable for potable water and space heating applications. Do not use this appliance if any part has been underwater. Immediately call a qualified service technician to inspect the appliance and replace any part of the control system and gas control which has been under water.
If the water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold water supply line, means shall be provided to control thermal expansion. Contact the water supplier or a local plumbing inspector on how to control this situation.
A pressure relief valve must be installed near the hot water outlet that is rated in accordance with and complying with either The Standard for Relief Valves and Automatic Shutoff Devices for Hot Water Supply Systems, ANSI 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 199,900 Btuh. 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. The relief valve must be installed such that the discharge will be conducted to a suitable place for disposal when relief occurs. No reducing coupling or other restriction may be installed in the discharge line. The discharge line must be installed to allow complete drainage of both the valve and the line. If this unit is installed with a separate storage vessel, the separate vessel must have its own temperature and pressure relief valve. This valve must also comply with The Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22. (in the U.S. only). A temperature relief valve is not required, but if one is used, do not install the valve with the probe directly in the flow of water. This may cause unwarranted discharge of the valve.
Piping and components connected to the water heater shall be suitable for use with potable water. Toxic chemicals, such as those used for boiler treatment, shall not be introduced into the potable water.
A water heater used to supply potable water may not be connected to any heating system or components previously 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 mixing valve shall be installed to temper the water to reduce the scald hazard.
•Flush water through the pipe to clean out metal powder, sand and dirt before connecting it.
•Take appropriate heat insulation measures (e.g., wrapping with heat insulation materials, using electric heaters) according to the climate of the region to prevent the pipe from freezing.
•Use a union coupling or flexible pipe for connecting the pipes to reduce the force applied to the piping.
•Do not use piping with a diameter smaller than the coupling.
•When feed water pressure is too high, insert a depressurizing valve, or take water hammer prevention measure.
•Avoid using joints as much as possible to keep the piping simple.
•Avoid piping in which an air holdup can occur.
•If installing the unit on a roof:
•About lower-level hot water supply
If the unit is installed on a roof to supply water to the levels below, make sure that the water pressure supplied to the unit does not drop below 29 psi. It may be necessary to install a pump system to ensure that the water pressure is maintained at this level.
Check the pressure before putting the unit into operation.
Failure to supply the proper pressure to the unit may result in noisy operation, shorter lifetime of the unit, and may cause the unit to shut down frequently.
Supply water piping
•Do not use PVC, iron, or any piping which has been treated with chromates, boiler seal or other chemicals.
•Mount a check valve and a shut off valve (near the inlet).
•In order for the client to use the water heater comfortably, 98.1 to 491 kPa (14 to 70 PSI) of pressure is needed from the water supply.
Be sure to check the water pressure. If the water pressure is low, the water heater cannot perform to its full capability, and may become a source of trouble for the client.
Drain piping
•Expansion water may drop from the pressure prevention device and wet the floor. If necessary, provide drain piping or use a drain hose to remove the water.
Hot water piping
•Do not use lead, PVC, iron or any piping which has been treated with chromates, boiler seal or other chemicals.
•The longer the piping, the greater the heat loss. Try to make the piping as short as possible.
•Use mixing valves with low water resistance. Use shower heads with low pressure loss.
•If necessary, use a pump or other means to ensure that the supply water pressure to the inlet of the heater does not fall below 29 PSI when the maximum amount of water is being demanded. Also install a pressure meter 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.
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