Pentax N-0751M, N-0751M-OD User Manual

Installation Manual

NORITZ AMERICA CORPORATION

Canada

TANKLESS GAS WATER HEATER

N-0751M (Indoor/Outdoor Installation) N-0751M-OD (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 indicates an imminently hazardous situation which,

DANGER

if not avoided, will result in death or serious injury.

WARNING

CAUTION

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

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

Disconnect Power

Ground

Be sure to do

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

WS-06-9012

Rev. 01/07

Low NOx

Approved by

SCAQMD

Installation must conform with local codes, or in the absence of local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54- latest 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.

Included Accessories

The following accessories are included with the unit. Check for any missing items before starting installation.

Part Shape Q’ty

Tapping Screw

(N-0751M only)

Owner's Guide, Warranty,

Installation Manual

(this document)

Remote Controller

Cord (3m(10'))

Optional Accessories

Quick Connect Cord

Isolator Exp

(includes pressure

relief valve)

each

Cross Recessed

Head Screw

(N-0751M-OD only)

Remote Controller

(See p. 21)

The accessories listed below are not included with the units, but may be necessary for installation.

Remote Controller

Cord (8m(26'))

Pipe Cover

Q’tyShapePart

Q’tyShapePartPart Shape Q’ty

[Outdoor installation only]

Remote Controller

Outdoor

Junction Box

[ N-0751M only ]

Part Shape Q’ty

Outdoor Vent Cap

(VC4(-1))

[ N-0751M-OD only ]

Part Shape Q’ty

Recess Box

(RB-4)

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 Connector

Typical Plumbing

Cord Connector

Terminal Block

Remote Controller

Remote Controller Cord

Distance at center 400 - 800mm (16-32")

Distance on sides 50 - 450mm (2-18")

* When connecting two units, use only

a single remote controller.

Note: Connect the remote

controller to only one of the units.

Gas Supply Piping

Cold Water Supply

Hot Water

Union

Gas Valve

Shutoff Valve

Hot Water

Cold Water

Size the piping to allow for the maximum flow rates of the units.

Make this distance as short as possible. * The hot water temperature will become unstable as the pipe length increases.

Union

Quick Connect cord

Pressure Relief Valve

Shutoff Valve

Leave enough clearance around the plumbing to apply insulation. It will be necessary to add bends to the piping to ensure that this clearance is available.

• 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.

0 - 2,000 Ft.

168,000

2.0

162,800

2,000 - 4,500 Ft.

610 - 1,370 m

Before Installation

DANGER

Checkup

[For indoor installation only]

• Check the fixing brackets and vent pipe yearly for damage or wear. Replace if necessary.

WARNING

Check the Gas

• Check that the rating plate indicates the correct type of gas.

• Check that the gas supply line is sized for 199,900 Btuh for this unit.

Check the Power

• The power supply required is 120V AC, at 60Hz.

N-0751M

Natural

199,900 BTU

12,000 BTU

0 - 2,000 Ft.

Gaz Naturel

199,900

168,000

2.0

202

(

0 - 610 m

4.0

0.65

765

)

2,000 - 4,500 Ft.

10.5"

2.55"

192,800

162,800

(610 - 1,370 m

2.0

)

Using the incorrect voltage may result in fire or electric shock.

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.

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 poisoning and a potential fire hazard.

Indoor

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]

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 according to the National Fuel Gas Code (ANSI Z223.1).

[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.

Prohibited

Be sure to do

[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.

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. 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

• Maintain the following clearance from both combustible and non-combustible materials.

From Heater

Required Clearances

• 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 noncombust-

ible material of a width greater than the

Cooking Equipment

water heater.

Check Illustration

Exhaust hood

Dividing plate

Range

300mm (12") Indoor 900mm (36") Outdoor

600mm (24") Outdoor 100mm (4") Indoor

50mm (2") Indoor

600mm (24") Outdoor

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.

repair/inspection

Securing of space for

200mm (8") or more

600mm (24") or more

Min: 75mm (3")

200mm (8") or more

[ For N-0751M -OD]

Item Check

• Maintain the following clearance from both combustible and non-combustible materials.

*( ) indicates the distance when installing a heat insulat-

ing board (incombustible material other than metal, with thickness of 2.5mm (0.1") or more) or "section of building effectively finished with incombustible material." Note, however, that combustion failure may occur to the unit as exhaust gas reflects from the wall. Provide clearance of 600mm (24") or more in the front of the unit to facilitate inspection and repair.

Required Clearances From Heater

•

When installing the unit in a common side corridor, provide a clearance of 1175mm (47") or more in front of the unit.

• Set the bottom edge of the exhaust port about 2100mm (84") from the corridor floor.

600mm (24") (300mm (12")) or more

combustible

10mm (0.4") or more

combustible

150mm (6") or more

Handrail

combustible

900mm (36") or more

150mm (6") or more

combustible

1175mm (47") or more about

2100mm (84") common side

corridor

• When installing the unit on a balcony, etc., secure an evacuation route of 600mm (24") or more in width.

• Provide clearance of 600mm (24") or more in front of the unit to facilitate inspection and repair. Do install the unit such as the wall of the second floor where the unit is out

Surrounding the area of installation

of reach.

600mm (24") or more

Handrail

balcony, etc.

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.

G= H=

Clearance

Above grade, veranda, porch, deck, or balcony

Window or door that may be opened

Permanently closed window Vertical clearance to ventilated soffit

located above the terminal within a horizontal distance of 0.6m the center of the terminal

Unventilated soffit Outside corner Inside corner Each side of center line extended

above meter/regulator assembly Service regulator vent outlet Nonmechanical air supply inlet or

combustion air inlet to any other appliance

Mechanical air supply inlet

Above paved sidewalk or paved driveway located on public property

Under veranda, porch, deck, or balcony

(2')

from

Vent Terminal

Air Supply Inlet

Indoor Installation

(See p.10)

1.2m (4') below or to the side of opening, or 0.3m (1') above

opening [900mm (36")]

* * *

0.9m (3') within a height 4.5m (15')

above meter/regulator assembly

0.9m (3')

1.2m (4') below or to the side of opening, or 0.3m (1') above

opening [900mm (36")]

0.9m (3') above if within 3m (10') [1.8m (6')]

[2.1m *** (7' ***)]

*[300mm (12") - Canada Only****] *[300mm (12") - Canada Only****]

Outdoor Installation

300mm (12") [300mm (12")]300mm (12") [300mm (12")]

300mm (12") [900mm (36")]

0.9m (3') within a height 4.5m (15') above meter/regulator assembly

300mm (12") [900mm (36")]

0.9m (3') above if within 3m (10') [1.8m (6')]

Area Where Terminal is Not Permitted

(See p.10, 11)

* * *

0.9m (3')

[2.1m *** (7' ***)]

[ ]= 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.

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:

• 1.2m (4') below, 1.2m (4') horizontally from, or 0.3m (1') above any door, operable window, or gravity air inlet into any building.

0.9m (3') above any forced air inlet within 3m (10').

stalled Indoors

Vent Clearances When Heater is In-

• 0.3m (1') below, 0.3m (1') horizontally from, or 0.3m (1') above any door, operable window, or gravity air inlet into any building.

0.9m (3') above any forced air inlet within 3m (10').

Illustration

1.2m (4')

0.3m (1')

0.9m (3')

0.3m (1')

0.9m (3')

stalled Outdoors With a Vent Cap

Vent Clearances When Heater is In-

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.

(Noritz vent cap)

[ For N-0751M- OD]

Maintain the following clearances to any

opening in any building:

• 0.3m (1') below, 0.3m (1') horizontally from,

or 0.3m (1') above any door, operable window, or gravity air inlet into any building.

0.9m (3') above any forced air inlet within 3m (10').

into Any Building

Outdoor Clearances to Opening

• 0.3m (1') below, 0.3m (1') horizontally from, or 0.3m (1') above any door, operable window, or gravity air inlet into any building.

0.9m (3') above any forced air inlet within 3m (10').

Illustration

0.3m (1')

0.9m (3')

0.3m (1')

0.9m (3')

Installed in a Recess Box

Vent Clearances When Heater is

(recess box installation with cover removed)

For Installations in Canada, clearances are as follows: To windows, doors, & gravity air inlets: 900mm (36"). To forced air inlets: 1.8m (6').

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 sufficient, 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

Be sure to do

be damaged and may become highly dangerous.

• Install the unit on a vertical wall and ensure that it is level.

Item

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.

Locating Screw Holes

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

Mounting

device.

Illustration

Location of Screw Hole

Mounting Bracket (upper)

Locating Screw Holes

Tapping Screw

• Make sure the unit is installed securely so that it will

not fall or move due to vibrations or earthquakes.

Structure

• 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 discon-

necting 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

Above 610m (2,000').

system.

Installations at Elevations

DISCONNECT

HIGH ELEVATION

Vent Pipe Installation

[ For N-0751M]

CARBON MONOXIDE POISONING Follow all vent system requirements in accordance with relevant local or state regulation,

Be sure to do

or, in the absence of local or state code, in the U.S. to the National Fuel Gas Code ANSI Z233.1/NFPA 54 – latest edition, and in Canada, in accordance with NSCNGPI.

(Indoor Installation Only)

WARNING

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

34.6m (15')

28.2m (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

Product Hor. Vert. Hor. Vert.

Noritz N-Vent Protech FasNSeal

Protech FasNSeal W2 HeatFab SafTVent Z-Flex Z-Vent Flex-L-StaR-34

250mm (10") (sides) 375mm (15") (top) 150mm (6") (bottom)

200mm (8") (sides) 300mm (12") (top) 100mm (4") (bottom)

150mm

(6")

150mm

(6")

200mm

(8")

200mm

(8")

100mm

(4")

100mm

(4")

100mm

(4")

150mm

(6")

100mm

(4")

100mm

(4")

75mm

(3")

75mm

(3")

75mm

(3")

50mm

(2")

25mm

(1")

25mm

(1")

75mm

(3")

75mm

(3")

75mm

(3")

50mm

(2")

25mm

(1")

25mm

(1")

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 & verti-

cal 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

Part No.

Protech FasNSeal FSAA4 HeatFab SafTVent 9401RYPK Z-Flex Z-Vent 2SVWA04 Flex-L Star-34 SRASPSA4

Horizontal Vent Termination

Hanger

Straps

Elbow

Slope vent

Downwards

**0.3m (1') Min. -

Appliance

Adapter*

0.9m (3') Max.

* Adapter not required when using Noritz N-Vent.

** 0.3m (1') minimum recommended, but not required. Avoid installing elbow directly on flue.

Vertical Vent Termination

Storm Collar

Roof Jack

Hanger

Elbow

**0.3m (1') Min. -

0.9m (3') Max.

Appliance

Strap

Condensation

Drain (Install According to

Local Codes)

Adapter*

* Adapter not required when using Noritz N-Vent.

** 0.3m (1') minimum recommended, but not required. Avoid installing elbow directly on flue.

Wall

Thimble

Rain

Cap

Flashing

Firestop/

Support

Firestop

Roof

Te r mination

• Terminate at least 300mm (12") above grade or above snow line.

• Terminate at least 2.1m (7') above a public walkway, 1.8m (6') from the combustion air intake of any appliance, and 0.9m (3') from any other building opening, gas utility meter, service regulator etc.

• Terminate at least 0.9m (3') above any forced air inlet within 3m (10'), 1.2m (4') below, 1.2m (4') horizontally from or 0.3m (1') above any door, window, or gravity air inlet into any building per National Fuel Gas Code ANSI Z223.1/NFPA 54.

• Slope the horizontal vent 1/4" downwards for every 300m (12").

• Use a condensation drain if necessary.

•In the Commonwealth of Massachusetts a carbon monoxide detector is required for all side wall horizontally vented gas fuel equipment. Please refer to Technical Bulletin TB 010606 for full installation instructions.

• Terminate at least 1.8m (6') from the combustion air intake of any appliance, and 0.9m (3') from any other building opening, gas utility meter, service regulator etc.

• 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.

Combustion Air

Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.

• Provide two permanent openings to allow circulation of combustion air.

• Make each opening 199 square inches if they provide indoor air, and 100 square inches for outdoor air.

• 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.

250mm (10")

500mm (20")

250mm (10")

Openings supplying indoor air

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

Gas Meter

Select a gas meter capable of supplying the entire btuh demand of all gas appliances in the building.

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

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.

Measuring Gas Pressure

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.

Noritz Gas Water Heater

(199,900 Btuh)

Outlet E

Section 4

1.5m (5') 1.5m (5')

3m (10')

Natural Gas

Meter

Sample Gas Line

Clothes Dryer

3m (10')

Section 3 Section 2

Outlet D

Gas Fireplace (25,000 Btuh)

**See next page for the pipe capacity charts.

(35,000 Btuh)

Outlet C

1.5m (5')

Section 1

3m (10')

Barbecue

(50,000 Btuh)

Outlet A

Outlet B

Gas Range Stove

(65,000 Btuh)

3m (10')

1.5m (5')

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"

Gas Line Sizing for a Noritz Gas Water Heater

Natur

Liquified P

Maximum Natur

Pipe

3m (10')

Size

1/2" 3/4"

1" 1 1/4" 1 1/2"

2" 2 1/2"

3 1/2"

Adapted from UPC 1997

al Gas Delivery Capacity in Cubic Feet per Hour (0.60 Specific Gravity, 0.5" WC Pressure Drop)

6m (20') 9m (30')

174

119 249

363

470

684 1404 2103

4050

6455 11,412 16,709 23,277

Contact the Gas Supplier for Btu/Cubic Ft. of the Supplied Gas. 1000 BTU/Cubic Ft. is a Typical Value

965 1445 2784 4437

7843 11,484 15,998

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90')

96 200 377

775 1161 2235 3563

6299 9222

12,847

82 171 323 663

993 1913 3049 5391 7893

10,995

Length in Feet

73 152 286 588 880

1696 2703 4778 6995 9745

66 138 259

532

798 1536 2449 4329 6338 8830

61 127 239 490 734

1413 2253

3983 5831 8123

404

605 1165 1857 3284 4808 6698

37.5m (125')

1033 1646 2910 4261 5936

56 53 50 44 118 111 104 93 222 208 197 174 456 683

1315 2096

3705 5425 7557

30m (100')

428

641 1234 1966

3476 5090 7091

358 536

Maximum Liquified P

Pipe

3m (10')

Size

1/2"

275

3/4"

567

1071

2205

1 1/4"

3307

1 1/2"

6221

** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.

Maximum Capacity of Flex TracPipe in Cubic Feet per Hour of Natural Gas

Pipe Size

3m (10')

206

3/4"

383

1 1/4"

614

1 1/2"

1261

2934

Maximum Capacity of Flex TracPipe in Thousands of Btuh Liquified Petroleum

Pipe Size

3m (10')

325

3/4"

605

1 1/4"

971

1 1/2"

1993

4638

** For reference only. Please consult gas pipe manufacturer for actual pipe capacities. TracPipe® is a registered trademark of Omega Flex.

etroleum (Undiluted) Delivery Capacity in Thousands of Btuh (0.5" WC Pressure Drop)

94 168 251

559

1317

149 265 397 884

2082

Length in Feet

103 217 409

834 1275 2394

Length in Feet

86 153 227 509

1203

Length in Feet

136 241 359 805

1902

96 196 378 771

1181 2205

80 141 209

471

1114

126 222 330

745

1761

89 185 346 724

1086 2047

75 132 194 440

1042

118 208 307 696

1647

83 173 322 677

1023 1921

78 162 307 630 976

1811

(0.60 Specific Gravity, 0.5" WC Pressure Drop)

71 125 181

415 983

112 197 286

656

1554

6m (20') 9m (30')

189

152

393

315

732

590

1496

1212

2299

1858

4331

3465

6m (20') 9m (30')

147 269 418 888

2078

232 425 661

1404 3285

121

218 334 723

1698

191

344 528

1143 2684

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 60m (200')

129

114

267

237

504

448

1039

913

1559

1417

2992

2646

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 45m (150')

105 188 284 625

1472

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 45m (150')

166 297 449 988

2327

37.5m (125') 45m (150')

1606

67 118 171 393 933

106 186 270

621

1475

132

146 275

252

567

511

866

787

1496

94 137 320

762

( 0.5" WC Pressure Drop)

87 143 217 506

1205

55 112 213 440 675

1260

60m (200')

116 277 661

60m (200')

129 183

438

1045

Maximum Capacity for Gas Flex Connectors in Cubic Feet per Hour of Natural Gas

Pipe Size

300mm (12") 600mm (24") 900mm (36") 1200mm (48") 1500mm (60") 1800mm (72") 1/2" 3/4"

1 1/4"

180 150

290 581

1470

Length in Inches

125 255 512

1200

106 215

442

1130

(0.60 Specific Gravity, 0.5" WC Pressure Drop)

197 397 960

Maximum Capacity for Gas Flex Connectors in Thousands of Btuh Liquified Petroleum

Pipe

300mm (12") 600mm (24") 900mm (36") 1200mm (48") 1500mm (60") 1800mm (72")

Size

1/2" 3/4"

1 1/4"

** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.

288 240

465 930

2352

Length in Inches

200 409 825

1920

169 344 708

1808

149 315 638

1536

173 347 930

( 0.5" WC Pressure Drop)

137 278 556

1488

Installation and service must be performed by a qualified plumber. In the Commonwealth of Massachusetts, this product must be installed by a licensed

10.

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

• 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.

Water Piping

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.

water hammer prevention measure.

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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