Lochinvar SNR126-065, SNR151-100, SNR201-100, SNA151-100, SNA201-100 Installation Manual

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SHW-I-S Rev A

Installation & Service

Manual

Models: SNR126-065, SNR151-100,

SNR201-100, SNA151-100, SNA201-100,

SNA286-125, SNA401-125, AND SNA501-125

WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

--Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

--WHAT TO DO IF YOU SMELL GAS

•Do not try to light any appliance.

•Do not touch any electrical switch; do not use any phone in your building.

•Immediately call your gas supplier from a near by phone. Follow the gas supplier’s instructions.

•If you cannot reach your gas supplier, call the fire department.

--Installation and service must be performed by a qualified installer, service agency, or the gas supplier.

WARNING This manual must only be used by a qualified heating installer / service

technician. Read all instructions in this manual before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.

Save this manual for future reference.

Contents

PLEASE READ BEFORE PROCEEDING ......................	3
Hazard Definitions ......................................................	3
THE SHIELD -- HOW IT WORKS ...............................	4-6
RATINGS .........................................................................	7
1. DETERMINE WATER HEATER LOCATION
Closet and Alcove Installations ........................................	8
Provide Clearances..........................................................	8
Flooring and Foundation ................................................	10
Remove Water Heater from Wood Pallet ......................	10
Prevent Combustion Air Contamination.........................	10
Using an Existing Vent System to Install a New Water
Heater.............................................................................	11
Removing Water Heater From Existing Common Vent . 11
Combustion & Ventilation Air Requirements............	12-14
2. GENERAL VENTING
Direct Venting Options ...................................................	15
Install Vent and Combustion Air Piping .........................	16
Requirements for Installation in Canada........................	17
Sizing .............................................................................	17
Min./Max. Combustion Air & Vent Piping Lengths ..........	17
Materials..........................................................................	18
Optional Room Air..........................................................	19
PVC/CPVC .....................................................................	20
Polypropylene.................................................................	21
Stainless Steel Vent .......................................................	22
3. SIDEWALL DIRECT VENTING....................	23-29
4. VERTICAL DIRECT VENTING............................	30-33
5. SYSTEM PIPING
General Piping ...............................................................	34
Scalding ....................................................................	34
Water Chemistry .......................................................	35
Piping Components........................................................	35
Piping Diagrams ..................................................	36-38
6. GAS CONNECTIONS
Connecting Gas Supply Piping ......................................	39
Natural Gas ....................................................................	40
Pipe Sizing for Natural Gas ......................................	40
Natural Gas Supply Pressure Requirements ...........	40
Propane Gas ..................................................................	40
Pipe Sizing for Propane Gas ....................................	40
Propane Supply Pressure Requirements .................	40
Check Inlet Gas Supply ............................................	41-42
Gas Pressure .................................................................	42
Gas Valve Replacement ................................................	42
7. FIELD WIRING
Low Voltage Connections ..............................................	43
Enable Switch ................................................................	43
Louver Relay Output / Louver Proving Switch Input......	43
Power Cord Connection ................................................	43
Runtime Contacts ..........................................................	43
Alarm Contacts ..............................................................	43

8. CONDENSATE DISPOSAL
Condensate Drain ............................................................	46
9. START-UP
Check for Gas Leaks .......................................................	47
Inspect/fill Condensate System........................................	47
Final Checks Before Starting the Water Heater..........	47-50
10. OPERATING INFORMATION
How the Water Heater Operates......................................	51
Temperature Control ........................................................	51
Protection Features..........................................................	51
Water Heater Temperature Regulation............................	52
Adjustable Control Parameters ...................................	52-53
The Shield Control Module ..............................................	54
11. MAINTENANCE
Maintenance and Annual Startup.....................................	55
Address Reported Problems ......................................	56
Inspect Water Heater Interior .....................................	56
Clean Condensate Trap .............................................	56
Check All Piping for Leaks..........................................	56
Flue Vent System and Air Piping................................	56
Check Water System..................................................	56
Check Expansion Tank...............................................	57
Check Water Heater Relief Valve...............................	57
Inspect Ignition & Flame Sense Electrodes................	57
Check Ignition Ground Wiring.....................................	57
Check All Water Heating Wiring .................................	57
Check Control Settings...............................................	57
Perform Startup & Checks..........................................	57
Check Burner Flames.................................................	58
Check Flame Signal ...................................................	58
Review with Owner.....................................................	58
Handling Ceramic Fiber Materials ..............................	58
Cleaning Heat Exchanger......................................	58-59
Oiled Bearing Circulators............................................	59
Magnesium Anode Rod Inspection.............................	59
Check Delta T.............................................................	59
12. TROUBLESHOOTING
Before Troubleshooting....................................................	60
Troubleshooting Chart - No Display ...........................	61
Checking Temperature Sensors.................................	62
Troubleshooting Chart - Noisy System.......................	63
Troubleshooting Chart - Fault Messages
Displayed ...............................................................	64-69
Combustion Analysis Procedure ......................................	70
Gas Valve Adjustment Procedure....................................	71
13. DIAGRAMS
Ladder Diagram ...............................................................	72
Wiring Diagram.................................................................	73

Installation & Service Manual

Please read before proceeding

Hazard definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.

DANGER

WARNING

CAUTION CAUTION NOTICE

DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

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.

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

NOTICE indicates special instructions on installation, operation, or maintenance that are important but not related to personal injury or property damage.

WARNING

NOTICE

Installer – Read all instructions, in this manual before installing. Perform steps in the order given.

Have this water heater serviced/inspected by a qualified service technician, at least annually.

Failure to comply with the above could result in severe personal injury, death or substantial property damage.

When calling or writing about the water heater – Please have the water heater model and serial number from the water heater rating plate.

	Consider piping and installation when
	determining water heater location.
	Any claims for damage or shortage in
	shipment must be filed immediately against
	the transportation company by the consignee.
	Factory warranty (shipped with unit) does
	not apply to units improperly installed or
	improperly operated.
	Failure to adhere to the guidelines on this
WARNING	Failure to adhere to the guidelines on this
	page can result in severe personal injury,
	death, or substantial property damage.

When servicing the water heater –

•To avoid electric shock, disconnect electrical supply before performing maintenance.

•To avoid severe burns, allow the water heater to cool before performing maintenance.

WARNING	If the information in these instructions is
	not followed exactly, a fire or explosion
	may result causing property damage,
	personal injury or death
	-- Do not store or use gasoline or other
	flammable vapors and liquids in the
	vicinity of this or any other appliance.
	-- WHAT TO DO IF YOU SMELL GAS
	• Do not try to light any appliance.
	• Do not touch any electrical switch; do
	not use any phone in your building.
	• Immediately call your gas supplier
	from a near by phone. Follow the
	gas supplier’s instructions.
	• If you cannot reach your gas supplier,
	call the fire department.
	-- Installation and service must be
	performed by a qualified installer,
	service agency, or the gas supplier.

Water heater operation –

•Do not block flow of combustion or ventilation air to the water heater.

•Should overheating occur or gas supply fail to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off the gas supply at a location external to the appliance.

•Do not use this water heater if any part has been under water. The possible damage to a flooded appliance can be extensive and present numerous safety hazards. Any appliance that has been under water must be replaced.

The Shield - How it works...

1.Access cover - front

Provides access to the gas train, heat exchanger and controls.

2.Air intake adapter

Allows for the connection of the PVC air intake pipe to the water heater.

3.Air pressure switch

The air pressure switch detects blocked inlet conditions.

4.Air shroud (501-125 Model Only_Not Shown)

The air shroud directs air and gas flow into the blower.

5.Blower

The blower pulls in air and gas through the venturi (item 32). Air and gas mix inside the blower and are pushed into the burner, where they burn inside the combustion chamber.

6.Burner (not shown)

Made with metal fiber and stainless steel construction, the burner uses pre-mixed air and gas and provides a 5 to 1 firing rate.

7.Condensate drain connection

Connects the condensate drain line to 1/2" PVC.

8.Electronic Control Module

The electronic control responds to internal and external signals and controls the blower, gas valve, and pump to meet the demand.

9.Electronic display

The electronic display consists of 4 buttons, and a liquid crystal display. The display is used to make adjustments and read water heater status.

10.Flame inspection window (not shown)

The quartz glass window provides a view of the burner surface and flame.

11.Flame sensor

Used by the control module to detect the presence of burner flame.

12.Flue gas sensor (not shown)

This sensor monitors the flue gas exit temperature. The control module will modulate and shut down the water heater if the flue gas temperature gets too hot. This protects the flue pipe from overheating.

13.Gas connection pipe

Threaded pipe connection, either 1/2", 3/4", or 1", depending on the model. This pipe should be connected to the incoming gas supply for the purpose of delivering gas to the water heater.

14.Gas shutoff switch (151-100 - - 286-125 Models Only)

An electrical switch designed to cut power from the gas valve to prevent gas flow to the burner.

15.Gas shutoff valve (401-125 -- 501-125 Models Only)

Manual valve used to isolate the gas valve from the gas supply.

16.Gas valve

The gas valve senses the negative pressure created by the blower, allowing gas to flow only if the gas valve is powered and combustion air is flowing.

17.Heat exchanger access cover

Allows access to the combustion side of the heat exchanger coils.

Installation & Service Manual

18.Heat exchanger inlet temperature sensor

This sensor monitors the inlet water temperature to the heat exchanger.

19.Heat exchanger outlet temperature sensor

This sensor monitors heat exchanger outlet water temperature.

20.Ignition electrode

Provides direct spark for igniting the burner.

21.Line voltage junction box

The junction box contains the connection points for the line voltage power.

22.Low voltage connection board

The connection board is used to connect external low voltage devices.

23.Low voltage wiring connections (knockouts)

Conduit entryway for the low voltage connection board.

24.Power cord

The power cord allows for quick connection to 120V supply.

25.Pump

Circulates water between the tank and the heat exchanger.

26.Pump relay

Switches power to the pump.

27.Relief valve

Protects the heat exchanger from over pressure and temperature conditions. The relief valve is set at 150 PSI.

28.Stainless steel heat exchanger

Allows water to flow through specially designed coils for maximum heat transfer, while providing protection against flue gas corrosion. The coils are encased in a jacket that contains the combustion process.

29.Tank sensor

Used by the control to monitor the temperature of the tank.

30.Pump access panel

Panel used to gain access to the pump and condensate trap; also used to gain access to the outlet water sensor on Models 286-125 -- 501-125 only.

31.Vent pipe connection

Allows for the connection of the vent pipe system to the water heater.

32.Venturi

The venturi controls air and gas flow into the burner.

33.Water heater drain valve

Location from which the water heater can be drained.

34.Water inlet

Copper sweat connection for cold water supply that returns water from the system to the heat exchanger, either 1-1/2" or 2", depending on the model.

35.Water outlet

Copper sweat connection that supplies hot water to the system, either 1-1/2" or 2", depending on the model.

36.Over-temp switch (286-125 --501-125 Models Only)

An electrical switch designed to shut down water heater operation in the event the outer back of the heat exchanger, directly above the flue connection exceeds 604°F (318°C). This is a one time switch and could warrant a heat exchanger replacement. Check the integrity of the rear refractory at the back of the upper coil if the switch opens.

Installation & Service Manual

The Shield - How it works... (continued)

Models 126-065 -- 201-100	23
24	2
24	34
	13
1	31
	27
	35
	7
	30
9

IMG00461

	29	IMG00461
		IMG00461
34
Front View - Models 126-065 -- 201-100		Rear View - Models 126-065 -- 201-100

		28
	24
		13
	20	35
	11	2
	21	2
	21
	22	16
	22	32
		32
		14
		3
		5
		8
		9

IMG00461

Left Side (inside unit) -- Models 126-065 -- 201-100

	3
25	17
21
7	26
7
	9

IMG00461

Right Side (inside unit) -- Models 126-065 -- 201-100

Lochinvar SNR126-065, SNR151-100, SNR201-100, SNA151-100, SNA201-100 Installation Manual

Installation & Service Manual

The Shield - How it works...

Models 286-125 -- 401-125
	15		24
35	2	23
35	27
	27
31		1
28		1
28	34		35
		26	35


36	19	22
	19	8
	18	21	13
	7	20
	7	11	16
	25	11
		17
		17	32
			14
		9	5
			3
	IMG00461	29	IMG00461
	IMG00461	29
		33

Rear View - Models 286-125 -- 401-125

Right Side (inside unit) - Models 286-125 -- 401-125

Model 501-125			24
15		23
2		23
2
35
31	27	1
		1
			35
28			35
28		26
		26
		22
36	34	8
36		21
		21
	19	20	13
	19	17
	18	17
	18	11	16
			16
			32
	7		32
	7		14
		9	5
	25	9	3
	25

	29
IMG00461	IMG00461
	33
Rear View - Model 501-125	Right Side (inside unit) - Model 501-125

Installation & Service Manual

Ratings

					HLW

Model Number		CSA
Note: Change “N”	Input Modulation Btu/hr			Water Content	Water	Gas	Vent/Air Size
Note: Change “N”				Gallons	Connections	Connections
to “L” for L.P. gas		(Note 2)		Gallons	Connections	Connections
to “L” for L.P. gas		(Note 2)
models.
models.	Min		Max				(Note 1)
	Min		Max				(Note 1)
SNR126-065	25,000 - 125,000			TBD	1-1/2"	1/2"	3"

SNR151-100	30,000 - 150,000			TBD	1-1/2"	1/2"	3"

SNA151-100	30,000 - 150,000			TBD	1-1/2"	1/2"	3"

SNR201-100	40,000 - 200,000			TBD	1-1/2"	1/2"	3"

SNA201-100	40,000 - 200,000			TBD	1-1/2"	1/2"	3"

SNA286-125	57,000 - 285,000			TBD	2"	3/4"	4"

SNA401-125	80,000 - 400,000			TBD	2"	1"	4"

SNA501-125	100,000 - 500,000			TBD	2"	1"	4"

NOTICE	Maximum allowed working pressure is located on the rating plate.
NOTICE
Notes:

1. Shield water heaters require special gas venting. Use only the vent materials and methods specified in the Shield Installation and Service Manual.

2. Standard Shield water heaters are equipped to operate from sea level to 4,500 feet only with no adjustments. The water heater will de-rate by 4% for each 1,000 feet above sea level up to 4,500 feet.

3. High altitude Shield water heaters are equipped to operate from 3,000 to 12,000 feet only with no field adjustments. The water heater will de-rate by 2% for each 1,000 feet above 3,000 feet. High altitude models are manufactured with a different control module for altitude operation, but the operation given in this manual remains the same as the standard models. A high altitude label (as shown in FIG. A) is also affixed to the unit.

UNIT EQUIPPED FOR

HIGH ALTITUDE

3,000 FT. TO 12,000 FT.

IMG00462

Figure A High Altitude Label Location

Installation & Service Manual

1 Determine water heater location

Installation must comply with:

•Local, state, provincial, and national codes, laws, regulations, and ordinances.

•National Fuel Gas Code, ANSI Z223.1 – latest edition.

•National Electrical Code.

•For Canada only: B149.1 Installation Code, CSA C22.1 Canadian Electrical Code Part 1 and any local codes.

	NOTICE	The Shield water heater gas manifold
	NOTICE	and controls met safe lighting and other
		and controls met safe lighting and other
		performance under tests specified in
		ANSI Z21.10.3 – latest edition.

Before locating the water heater, check:

1.Check for nearby connection to:

•Water piping

•Venting connections

•Gas supply piping

•Electrical power

2.Locate the appliance so that if water connections should leak, water damage will not occur. When such locations cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed under the appliance. Under no circumstances is the manufacturer to be held responsible for water damage in connection with this appliance, or any of its components.

3.Check area around the water heater. Remove any combustible materials, gasoline and other flammable liquids.

Failure to keep water heater area clear andWARNING free of combustible materials, gasoline, and other flammable liquids and vapors can result in severe personal injury, death,

or substantial property damage.

4. The Shield water heater must be installed so that gas control system components are protected from dripping or spraying water or rain during operation or service.

WARNING This appliance is certified as an indoor appliance. Do not install the appliance

outdoors or locate where the appliance will be exposed to freezing temperatures or to temperatures that exceed 100°F.

Do not install the appliance where the relative humidity may exceed 93%. Do not install the appliance where condensation may form on the inside or outside of the appliance, or where condensation may fall onto the appliance.

Failure to install the appliance indoors could result in severe personal injury, death, or substantial property damage.

WARNING	This appliance requires a special venting
WARNING	system. The vent connection to the
	appliance must be made with the CPVC
	pipe section provided with the appliance.
	The field provided vent fittings must

be cemented to the CPVC pipe section. Use only the vent materials, primer and cement specified in this manual to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.

Closet and alcove installations

A closet is any room the water heater is installed in which is less than 433 cubic feet for 126-065 and 201-100 models and 638 cubic feet for the 286-125 through 501-125 models.

An alcove is any room which meets the criteria for a closet with the exception that it does not have a door.

Example: Room dimensions = 6 feet long, 6 feet wide, and 9 foot ceiling = 6 x 6 x 9 = 324 cubic feet. This would be considered a closet for a Shield Water Heater.

WARNING For closet and alcove installations as shown in FIG.’s 1-1 and 1-2, CPVC or

stainless steel vent material must be used inside the structure. The ventilating air openings shown in FIG.’s 1-1 and 1-2 are required for this arrangement. Failure to follow this warning could result in fire, personal injury, or death.

Provide clearances:

Clearances from combustible materials

1.Hot water pipes—at least 1/4" from combustible materials.

2.Vent pipe – at least 1" from combustible materials.

3.See FIG.’s 1-1 and 1-2 on page 9 for other clearance minimums.

Clearances for service access

1.See FIG.’s 1-1 and 1-2 on page 9 for recommended service clearances. If you do not provide the minimum clearances shown, it may not be possible to service the water heater without removing it from the space.

		Installation & Service Manual
1 Determine water heater location (continued)
Figure 1-1 Closet Installation - Minimum Required Clearances
1/4" (6.35 MM)	WARNING	For closet installations, CPVC,
MINIMUM CLEARANCE		For closet installations, CPVC,
AROUND HOT WATER PIPES		polypropylene	or stainless steel
1" (25.4 MM)		polypropylene	or stainless steel
MINIMUM CLEARANCE		vent material	MUST BE used in
AROUND VENT PIPE		vent material	MUST BE used in
AROUND VENT PIPE		a closet structure due to elevated
		a closet structure due to elevated
		temperatures.	Failure to follow
6"		this warning could result in fire,
		personal injury, or death.
VENTILATIING
AIR OPENING
CLOSED DOOR

VENTILATIING

AIR OPENING

RECOMMENDED SERVICE CLEARANCES:

Top -	18" (457 mm)
Left/Right Side -	24" (610 mm)
Front -	24" (610 mm)

IMG00463

Figure 1-2 Alcove Installation - Minimum Required Clearances

1/4" (6.35 MM) MINIMUM CLEARANCE

AROUND HOT WATER PIPES 1" (25.4 MM)

MINIMUM CLEARANCE AROUND VENT PIPE

OPEN FRONT

IMG00463

WARNING For alcove installations, CPVC, polypropylene or stainless steel

vent material MUST BE used in an alcove structure due to elevated temperatures. Failure to follow this warning could result in fire, personal injury, or death.

RECOMMENDED SERVICE

CLEARANCES:

Top -	18" (457 mm)
Left/Right Side -	24" (610 mm)
Front -	24" (610 mm)

Installation & Service Manual

1 Determine water heater location

Table 1A Corrosive Contaminants and Sources

Products to avoid:

Spray cans containing chloro/fluorocarbons

Permanent wave solutions

Chlorinated waxes/cleaners

Chlorine-based swimming pool chemicals

Calcium chloride used for thawing

Sodium chloride used for water softening

Refrigerant leaks

Paint or varnish removers

Hydrochloric acid/muriatic acid

Cements and glues

Antistatic fabric softeners used in clothes dryers

Chlorine-type bleaches, detergents, and cleaning solvents found in household laundry rooms

Adhesives used to fasten building products and other similar products

Areas likely to have contaminants

Dry cleaning/laundry areas and establishments

Swimming pools

Metal fabrication plants

Beauty shops

Refrigeration repair shops

Photo processing plants

Auto body shops

Plastic manufacturing plants

Furniture refinishing areas and establishments

New building construction

Remodeling areas

Garages with workshops

Flooring and foundation

Flooring

The Shield water heater is approved for installation on combustible flooring, but must never be installed on carpeting.

WARNING Do not install the water heater on carpeting even if foundation is used. Fire can result,

causing severe personal injury, death, or substantial property damage.

When local codes require compliance with NSF 5, the heater must be sealed to the floor with a food grade silicone to prevent debris and harborage of vermin under the heater.

If flooding is possible, elevate the water heater sufficiently to prevent water from reaching the water heater.

Remove water heater from wood pallet

1.Remove the sides and the top of the crate.

2.Remove the blocks on the base of the crate to allow for easier removal.

3.The water heater can then be slid off the base of the crate for installation.

NOTICE	Do not drop the water heater or bump the
NOTICE	jacket on the floor or pallet. Damage to the
	water heater can result.

Prevent combustion air contamination

Install air inlet piping for the Shield water heater as described in this manual. Do not terminate vent/air in locations that can allow contamination of combustion air. Refer to Table 1A, for products and areas which may cause contaminated combustion air.

WARNING Ensure that the combustion air will not contain any of the contaminants in Table 1A.

Contaminated combustion air will damage the water heater, resulting in possible severe personal injury, death or substantial property damage. Do not pipe combustion air near a swimming pool, for example. Also, avoid areas subject to exhaust fumes from laundry facilities. These areas will always contain contaminants.

When using an existing vent system to install a new water heater:

Installation & Service Manual

1 Determine water heater location (continued)

When removing a water heater from existing common vent system:

WARNING	Failure to follow all instructions can result
WARNING	in flue gas spillage and carbon monoxide
	emissions, causing severe personal injury
	or death.

Check the following venting components before installing:

•Material - For materials listed for use with this appliance, see Section 2 - General Venting. For polypropylene or stainless steel venting, an adapter of the same manufacturer must be used at the flue collar connection.

•Size - To ensure proper pipe size is in place, see Table 2A. Check to see that this size is used throughout the vent system.

•Manufacturer - For a stainless steel or polypropylene application, you must use only the listed manufacturers and their type product listed in Tables 2E and 2G for CAT IV positive pressure venting with flue producing condensate.

•Supports - Non-combustible supports must be in place allowing a minimum 1/4" rise per foot. The supports should adequately prevent sagging and vertical slippage, by distributing the vent system weight. For additional information, consult the vent manufacturer’s instructions for installation.

•Terminations - Carefully review Sections 2 through 4 to ensure requirements for the location of the vent and air terminations are met and orientation of these fit the appropriate image from the Sidewall or Vertical options listed in the General Venting Section. For stainless steel vent, only use terminations listed in Table 2H for the manufacturer of the installed vent.

•Seal - With prior requirements met, the system should be tested to the procedure listed in parts (c) through (f) of the Removal of an Existing Water Heater Section, this page.

With polypropylene and stainless steel vent, seal and connect all pipe and components as specified by the vent manufacturer used; with PVC/CPVC vent, see the Installing Vent or Air Piping Section on page 20.

If any of these conditions are not met,WARNING the existing system must be updated

or replaced for that concern. Failure to follow all instructions can result in flue gas spillage and carbon monoxide emissions, causing severe personal injury or death.

	DANGER	Do not install the Shield water heater
	DANGER	into a common vent with any other
		into a common vent with any other
		appliance. This will cause flue gas spillage
		or appliance malfunction, resulting in
		possible severe personal injury, death, or
		substantial property damage.
		Failure to follow all instructions can result
	WARNING	Failure to follow all instructions can result
	WARNING	in flue gas spillage and carbon monoxide
		emissions, causing severe personal injury
		or death.

At the time of removal of an existing water heater, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.

a.Seal any unused openings in the common venting system.

b.Visually inspect the venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion, or other deficiencies, which could cause an unsafe condition.

c.Test vent system – Insofar as is practical, close all building doors and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

d.Place in operation the appliance being inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.

e.Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe.

f.After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as outlined herein, return doors, windows, exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous conditions of use.

g.Any improper operation of the common venting system should be corrected so the installation conforms with the

National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code. When resizing any portion of the common venting system, the common venting system should be resized to approach the minimum size as determined using the appropriate tables in Part 11 of the National Fuel Gas Code, ANSI Z223.1/NFPA and/or CAN/CSA B149.1, Natural Gas and Propane Installation Code.

Installation & Service Manual

1 Determine water heater location

Maintain minimum specified clearances for adequate operation. All installations must allow sufficient space for servicing the vent connections, water pipe connections, piping and other auxiliary equipment, as well as the appliance.

Multiple appliances may be installed in a modular water heater installation. Multiple appliances may be installed side by side with no clearance between adjacent appliances because this appliance is approved for zero clearance from combustible surfaces.

Consult the Venting section of this manual for specific installation instructions for the appropriate type of venting system that you will be using.

1. If air is taken directly from outside	the building
with no duct, provide two permanent	openings to
the equipment room (see FIG. 1-3):

(a)Combustion air opening, with a minimum free area of one square inch per 4000 Btu/hr input (5.5 cm2 per KW). This opening must be located within 12" (30 cm) of the bottom of the enclosure.

(b)Ventilation air opening, with a minimum free area of one square inch per 4000 Btu/hr input (5.5 cm2 per kW). This opening must be located within 12" (30 cm) of the top of the enclosure.

Combustion and ventilation air requirements for appliances drawing air from the equipment room

Provisions for combustion and ventilation air must be in accordance with Air for Combustion and Ventilation, of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.

The equipment room MUST be provided with properly sized openings to assure adequate combustion air and proper ventilation.

Figure 1-4_Combustion Air Through Ducts

2. If combustion and ventilation air is taken from the outdoors using a duct to deliver the air to the equipment room, each of the two openings should be sized based on a minimum free area of one square inch per 2000 Btu/hr (11 cm2 per kW) of input (see FIG. 1-4).

Figure 1-3_Combustion Air Direct from Outside

Installation & Service Manual

1 Determine water heater location (continued)

IF NECESSARY FOR

TIGHT CONSTRUCTION

Figure 1-6_Combustion Air from Outside - Single Opening

Figure 1-5_Combustion Air from Interior Space

3.If air is taken from another interior space, each of the two openings specified above should have a net free area of one square inch for each 1000 Btu/hr (22 cm2 per kW) of input, but not less than 100 square inches (645 cm2) (see FIG. 1-5).

4.If a single combustion air opening is provided to bring combustion air in directly from the outdoors, the opening must be sized based on a minimum free area of one square inch per 3000 Btu/hr (7 cm2 per kW). This opening must be located within 12" (30 cm) of the top of the enclosure (see FIG. 1-6).

TABLE - 1B

MINIMUM RECOMMENDED COMBUSTION

AIR SUPPLY TO EQUIPMENT ROOM

	FIG. 1-3		FIG. 1-4		FIG. 1-5		FIG. 1-6
Model	*Outside Air from		*Outside Air from		**Inside Air from
	2 Openings Directly from		2 Ducts Delivered from		2 Ducts Delivered from Interior		*Outside Air from
Number	Outdoors		Outdoors		Space		1 Opening Directly
	Top	Bottom	Top	Bottom	Top	Bottom	from Outdoors, in2
	Opening, in2	Opening, in2	Opening, in2	Opening, in2	Opening, in2	Opening, in2
126-065	32	32	63	63	125	125	42
	(207 cm2)	(207 cm2)	(407 cm2)	(407 cm2)	(807 cm2)	(807 cm2)	(271 cm2)

151-100	38	38	75	75	150	150	50
	(246 cm2)	(246 cm2)	(484 cm2)	(484 cm2)	(968 cm2)	(968 cm2)	(323 cm2)

201-100	50	50	100	100	200	200	67
	(323 cm2)	(323 cm2)	(646 cm2)	(646 cm2)	(1,291 cm2)	(1,291 cm2)	(433 cm2)

286-125	72	72	143	143	285	285	95
	(465 cm2)	(465 cm2)	(923 cm2)	(923 cm2)	(1,839 cm2)	(1,839 cm2)	(613 cm2)

401-125	100	100	200	200	400	400	134
	(646 cm2)	(646 cm2)	(1,291 cm2)	(1,291 cm2)	(2,581 cm2)	(2,581 cm2)	(865 cm2)

501-125	125	125	250	250	500	500	167
	(807 cm2)	(807 cm2)	(1,613 cm2)	(1,613 cm2)	(3,226 cm2)	(3,226 cm2)	(1,078 cm2)

*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings. The above requirements are for the water heater only; additional gas fired appliances in the equipment room will require an increase in the net free area to supply adequate combustion air for all appliances.

**Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *“Tight Construction”. For buildings of *“Tight Construction”, provide air openings into the building from outside.

*No combustion air openings are needed when the water heater is installed in a space with a volume NO LESS than 50 cubic feet per 1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *“Tight Construction”.

*“Tight Construction” is defined as a building with less than 0.40 ACH (air changes per hour).

Installation & Service Manual

1 Determine water heater location

Combustion air requirements are based on the latest edition of the National Fuel Gas Code, ANSI Z223.1; in Canada refer to the latest edition of CGA Standard CAN B149.1. Check all local code requirements for combustion air.

All dimensions based on net free area in square inches. Metal louvers or screens reduce the free area of a combustion air opening a minimum of approximately 25%. Check with louver manufacturers for exact net free area of louvers. Where two openings are provided, one must be within 12" (30cm) of the ceiling and one must be within 12" (30cm) of the floor of the equipment room. Each opening must have net free area as specified in the chart above (Table 1B). Single openings shall commence within 12" (30cm) of the ceiling.

CAUTION Under no circumstances should the equipment room ever be under negative

pressure. Particular care should be taken where exhaust fans, attic fans, clothes dryers, compressors, air handling units, etc., may take away air from the unit.

The combustion air supply must be completely free of any flammable vapors that may ignite or chemical fumes which may be corrosive to the appliance. Common corrosive chemical fumes which must be avoided are fluorocarbons and other halogenated compounds, most commonly present as refrigerants or solvents, such as Freon, trichlorethylene, perchlorethylene, chlorine, etc. These chemicals, when burned, form acids which quickly attack the stainless steel heat exchanger, headers, flue collectors, and the vent system.

The result is improper combustion and a non-warrantable, premature appliance failure.

EXHAUST FANS: Any fan or equipment which exhausts air from the equipment room may deplete the combustion air supply and/or cause a downdraft in the venting system. Spillage of flue products from the venting system into an occupied living space can cause a very hazardous condition that must be immediately corrected. If a fan is used to supply combustion air to the equipment room, the installer must make sure that it does not cause drafts which could lead to nuisance operational problems with the appliance.

Installation & Service Manual

2 General venting

Direct venting options - Sidewall Vent

IMG00464

Figure 2-1 Two-Pipe Sidewall Termination - See page 23 for more details

Figure 2-2 PVC/CPVC Concentric Sidewall Termination - See page 27 for more details

Direct venting options - Vertical Vent

IMG00466

Figure 2-3 Two-Pipe Vertical Termination - See page 30 for more details

Figure 2-4 PVC/CPVC Concentric Vertical Termination - See page 32 for more details

Figure 2-5 Vertical Vent, Sidewall Air - See page 19 for more details

Installation & Service Manual

2 General venting

Install vent and combustion air piping

DANGER	The Shield water heater must be vented and
	supplied with combustion and ventilation
	air as described in this section. Ensure the
	vent and air piping and the combustion
	air supply comply with these instructions
	regarding vent system, air system, and
	combustion air quality. See also Section 1
	of this manual.
	Inspect finished vent and air piping
	thoroughly to ensure all are airtight and
	comply with the instructions provided and
	with all requirements of applicable codes.
	Failure to provide a properly installed vent
	and air system will cause severe personal
	injury or death.

WARNING

NOTICE

This appliance requires a special venting system. Use only approved stainless steel, PVC, CPVC or polypropylene pipe and fittings listed in Tables 2D, 2E, and 2G for vent pipe, and fittings. Failure to comply could result in severe personal injury, death, or substantial property damage.

DO NOT mix components from different systems. The vent system could fail, causing leakage of flue products into the living space. Mixing of venting materials will void the warranty and certification of the appliance.

Installation must comply with local requirements and with the National Fuel Gas Code, ANSI Z223.1 for U.S. installations or CSA B149.1 for Canadian installations.

WARNING

CAUTION NOTICE

For closet and alcove installations, CPVC, polypropylene or stainless steel material MUST BE used in a closet/alcove structure. Failure to follow this warning could result in fire, personal injury, or death.

Improper installation of venting systems may result in injury or death.

Follow the instructions in Section 1, page 11 of this manual when removing a water heater from an existing vent system.

WARNING Do not connect any other appliance to the vent pipe or multiple water heaters to

a common vent pipe. Failure to comply could result in severe personal injury, death, or substantial property damage.

The Shield water heater vent and air piping can be installed through the roof or through a sidewall. Follow the procedures in this manual for the method chosen. Refer to the information in this manual to determine acceptable vent and air piping length.

You may use any of the vent/air piping methods covered in this manual. Do not attempt to install the Shield water heater using any other means.

You must also install air piping from outside to the water heater air intake adapter unless following the Optional Room Air instructions on page 19 of this manual. The resultant installation is direct vent (sealed combustion).

Air intake/vent connections

1.Combustion Air Intake Connector (FIG. 2-6) - Used to provide combustion air directly to the unit from outdoors. A fitting is provided on the unit for final connection. Combustion air piping must be supported per guidelines listed in the National Mechanical Code, Section 305, Table 305.4 or as local codes dictate.

2.Vent Connector (FIG.'s 2-7 thru 2-9) - Used to provide a passageway for conveying combustion gases to the outside. A transition fitting is provided on the unit for final connection. Vent piping must be supported per the National Building Code, Section 305, Table 305.4 or as local codes dictate.

Figure 2-6 Near Water Heater Air Piping

AIR

IMG00467

2 General venting (continued)

Requirements for installation in Canada

1.Installations must be made with a vent pipe system certified to ULC-S636.

2.The first three (3) feet of plastic vent pipe from the appliance flue outlet must be readily accessible for visual inspection.

3.The components of the certified vent system must not be interchanged with other vent systems or unlisted pipe/fittings. For concentric vent installations, the inner vent tube must be replaced with field supplied certifiedvent material to comply with this requirement.

4.The 3" Concentric Vent Kit available from Lochinvar (see Section 3 – Sidewall Termination – Optional Concentric Vent) and the 3" Concentric Vent Kit available from IPEX are both approved for use on the Shield water heater. Both kits are listed to the ULC-S636 standard for use in Canada.

Sizing

The Shield water heater uses model specific combustion air intake and vent piping sizes as detailed in Table 2A below.

Table 2A Air Intake/Vent Piping Sizes


Model		Air Intake	Vent
126-065 -- 201-100		3 inches	3 inches
286-125 -- 501-125		4 inches	4 inches
	Increasing or decreasing combustion air
NOTICE	Increasing or decreasing combustion air
NOTICE	or vent piping sizes is not authorized.

Installation & Service Manual

Minimum / Maximum allowable combustion air and vent piping lengths are as follows:

Combustion Air = 12 equivalent feet minimum / 100 equivalent feet maximum

Vent = 12 equivalent feet minimum / 100 equivalent feet maximum

When determining equivalent combustion air and vent length, add 5 feet for each 90° elbow and 3 feet for each 45° elbow.

EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45° elbows + (1) concentric vent kit (CVK3003) = 49 equivalent feet of piping.

NOTICE	The appliance output rating will reduce
NOTICE	by up to 1.5% for each 25 feet of vent
	length.

Table 2B Concentric Vent Kit Equivalent Vent Lengths

Model	Kit	Equivalent
Model	Number	Vent Length
	Number	Vent Length
126-065 -- 201-100	CVK3003	3 feet
286-125	CVK3007	3 feet
401-125	CVK3007	5 feet
501-125	CVK3007	30 feet

2 General venting

Materials

Air inlet pipe materials:

The air inlet pipe(s) must be sealed. Choose acceptable combustion air inlet pipe materials from the following list:

PVC, CPVC, Polypropylene or ABS

Dryer Vent or Sealed Flexible Duct (not recommended for rooftop air inlet)

Galvanized steel vent pipe with joints and seams sealed as specified in this section.

Type “B” double-wall vent with joints and seams sealed as specified in this section.

AL29-4C, stainless steel material to be sealed to specification of its manufacturer.

*Plastic pipe may require an adapter (not provided) to transition between the air inlet connection on the appliance and the plastic air inlet pipe.

WARNING Using air intake materials other than those specified can result in personal

injury, death or property damage.

NOTICE	The use of double-wall vent or insulated
	material for the combustion air inlet pipe is
	material for the combustion air inlet pipe is
	recommended in cold climates to prevent
	the condensation of airborne moisture in
	the incoming combustion air.

Sealing of Type “B” double-wall vent material or galvanized vent pipe material used for air inlet piping on a sidewall or vertical rooftop Combustion Air Supply System:

a.Seal all joints and seams of the air inlet pipe using either Aluminum Foil Duct Tape meeting UL Standard 723 or 181A-P or a high quality UL Listed silicone sealant such as those manufactured by Dow Corning or General Electric.

b.Do not install seams of vent pipe on the bottom of horizontal runs.

c.Secure all joints with a minimum of three (3) sheet metal screws or pop rivets. Apply Aluminum Foil Duct Tape or silicone sealant to all screws or rivets installed in the vent pipe.

d.Ensure that the air inlet pipes are properly supported.

Installation & Service Manual

The PVC, CPVC, or ABS air inlet pipe should be cleaned and sealed with the pipe manufacturer’s recommended solvents and standard commercial pipe cement for the material used. The PVC, CPVC, ABS, Dryer Vent or Flex Duct air inlet pipe should use a silicone sealant to ensure a proper seal at the appliance connection and the air inlet cap connection. Dryer vent or flex duct should use a screw type clamp to seal the vent to the appliance air inlet and the air inlet cap. Proper sealing of the air inlet pipe ensures that combustion air will be free of contaminants and supplied in proper volume.

Follow the polypropylene manufacturer’s instructions when using polypropylene material as an inlet pipe.

When a sidewall or vertical rooftop combustion air supply system is disconnected for any reason, the air inlet pipe must be resealed to ensure that combustion air will be free of contaminants and supplied in proper volume.

DANGER	Failure to properly seal all joints and seams
DANGER	as required in the air inlet piping may
	result in flue gas recirculation, spillage
	of flue products and carbon monoxide
	emissions causing severe personal injury
	or death.

2 General venting (continued)

Optional room air

Optional room air is intended for NOTICE commercial applications. Combustion air piping to the outside is recommended

for residential applications.

Commercial applications utilizing the Shield water heater may be installed with a single pipe carrying the flue products to the outside while using combustion air from the equipment room. In order to use the room air venting option the following conditions and considerations must be followed.

• The unit MUST be installed with the appropriate room air provisions.

• The equipment room MUST be provided with properly sized openings to assure adequate combustion air. Please refer to instructions provided with the room air kit (KIT30052 - Models 126-065 -- 201-100 and KIT30053 - Models 286-125 -- 501125).

• There will be a noticeable increase in the noise level during normal operation from the inlet air opening.

• Using the room air configuration makes the unit vulnerable to combustion air contamination from within the building. Please review Section 1, Prevent Combustion Air Contamination, to ensure proper installation.

• Vent system and terminations must comply with the standard venting instructions set forth in this manual.

WARNING When utilizing the single pipe method, provisions for combustion and ventilation

air must be in accordance with Air for Combustion and Ventilation, of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.

Installation & Service Manual

Air contamination

Pool and laundry products and common household and hobby products often contain fluorine or chlorine compounds. When these chemicals pass through the water heater, they can form strong acids. The acid can eat through the water heater wall, causing serious damage and presenting a possible threat of flue gas spillage or water heater water leakage into the building.

Please read the information given in Table 1A, page 10, listing contaminants and areas likely to contain them. If contaminating chemicals will be present near the location of the water heater combustion air inlet, have your installer pipe the water heater combustion air and vent to another location, per this manual.

WARNING

If the water heater combustion air inlet is located in a laundry room or pool facility, for example, these areas will always contain hazardous contaminants.

To prevent the potential of severe personal injury or death, check for areas and products listed in Table 1A, page 10 before installing the water heater or air inlet piping.

If contaminants are found, you MUST:

• Remove contaminants permanently. —OR—

• Relocate air inlet and vent terminations to other areas.

Installation & Service Manual

2 General venting

PVC/CPVC

This product has been approved for use with the PVC/CPVC vent materials listed in Table 2D.

Installing vent and air piping

WARNING

NOTICE

WARNING

The vent connection to the appliance must be made with the starter CPVC pipe section provided with the appliance if PVC/CPVC vent is to be used. The field provided vent fittings must be cemented to the CPVC pipe section using an “All Purpose Cement” suitable for PVC and CPVC pipe. Use only the vent materials, primer, and cement specified in Table 2D to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.

Use only cleaners, primers, and solvents that are approved for the materials which are joined together.

All PVC vent pipes must be glued, properly supported, and the exhaust must be pitched a minimum of a 1/4 inch per foot back to the water heater (to allow drainage of condensate).

Insulation should not be used on PVC or CPVC venting materials. The use of insulation will cause increased vent wall temperatures, which could result in vent pipe failure.

Table 2D PVC/CPVC Vent Pipe, and Fittings

Approved PVC/CPVC Vent Pipe and Fittings

Item	Material	Standard
	PVC Schedule 40, 80	ANSI/ASTM D1785
Vent pipe	PVC - DWV	ANSI/ASTM D2665
	CPVC Schedule 40, 80	ANSI/ASTM F441
	PVC Schedule 40	ANSI/ASTM D2466
Vent fittings	PVC Schedule 80	ANSI/ASTM D2467
	CPVC Schedule 80	ANSI/ASTM F439
Pipe Cement	PVC	ANSI/ASTM D2564
/ Primer	CPVC	ANSI/ASTM F493

NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE

NOTE: In Canada, CPVC and PVC vent pipe, ﬁttings and cement/ primer must be ULC-S636 certiﬁed.

1.Work from the water heater to vent or air termination. Do not exceed the lengths given in this manual for the air or vent piping.

2.Cut pipe to the required lengths and deburr the inside and outside of the pipe ends.

3.Chamfer outside of each pipe end to ensure even cement distribution when joining.

4.Clean all pipe ends and fittings using a clean dry rag. (Moisture will retard curing and dirt or grease will prevent adhesion.)

5.Dry fit vent or air piping to ensure proper fit up before assembling any joint. The pipe should go a third to two-thirds into the fitting to ensure proper sealing after cement is applied.

6.Priming and Cementing:

a.Handle fittings and pipes carefully to prevent contamination of surfaces.

b.Apply a liberal even coat of primer to the fitting socket and to the pipe end to approximately 1/2" beyond the socket depth.

c.Apply a second primer coat to the fitting socket.

d.While primer is still wet, apply an even coat of approved cement to the pipe equal to the depth of the fitting socket along with an even coat of approved cement to the fitting socket.

e.Apply a second coat of cement to the pipe.

f.While the cement is still wet, insert the pipe into the fitting, if possible twist the pipe a 1/4 turn as you insert it. NOTE: If voids are present, sufficient cement was not applied and joint could be defective.

g.Wipe excess cement from the joint removing ring or beads as it will needlessly soften the pipe.

Figure 2-7 Near Water Heater PVC/CPVC Venting

VENT

20	IMG00468

MODELS: 286-125 - 501-125

MODELS: 126-065 - 201-100

Installation & Service Manual

2 General venting (continued)

Polypropylene

This product has been approved for use with polypropylene vent with the manufacturers listed in Table 2E.

All terminations must comply with listed options in this manual and be a single-wall vent offering.

For use of flex pipe, it is recommended to have the vent material in 32°F or higher ambient space before bending at installation. No bends should be made to greater than 45° and ONLY installed in vertical or near vertical installations.

For support and special connections required, see the manufacturer's instructions. All vent is to conform to standard diameter and equivalent length requirements established.

WARNING

NOTICE

Table 2E Polypropylene Vent Pipe and Fittings

Approved Polypropylene Vent Manufacturers

Use only the adapters and vent system listed in Tables 2E and 2F. DO NOT mix vent systems of different types or manufacturers. Failure to comply could result in severe personal injury, death, or substantial property damage.

Installations must comply with applicable national, state, and local codes. For Canadian installation, polypropylene vent must be listed as a ULC-S636 approved system.

Installation of a polypropylene vent system should adhere to the vent manufacturer’s installation instructions supplied with the vent system.

Make	Model
Centrotherm Eco Systems	InnoFlue SW/Flex

Duravent (M & G Group)	PolyPro Single-Wall / PolyPro Flex

	NOTICE	The installer must use a specific vent
	NOTICE	starter adapter at the flue collar
		connection. The adapter is supplied by
		the vent manufacturer to adapt to its vent
		system. See Table 2F for approved vent
		adapters. Discard CPVC starter piece.
		All vent connections MUST be secured by
	NOTICE	All vent connections MUST be secured by
	NOTICE	the vent manufacturer's joint connector
		(FIG. 2-8).

WARNING Insulation should not be used on polypropylene venting materials. The use

of insulation will cause increased vent wall temperatures, which could result in vent pipe failure.

Table 2F Approved PolypropyleneTerminations

Figure 2-8 Near Water Heater Polypropylene Venting

JOINT CONNECTOR REQUIRED AT
ALL COMPONENT CONNECTIONS
OF VENT SYSTEM
JOINT CONNECTOR REQUIRED AT ALL
COMPONENT CONNECTIONS
OF VENT SYSTEM
POLYPROPYLENE	POLYPROPYLENE
ADAPTER	ADAPTER

MODELS: 126-065 - 201-100	IMG00469
	MODELS: 286-125 - 501-125

Model		Centrotherm InnoFlue SW			Duravent Polypro

	Polypropylene	Joint	Sidewall Retaining	Sidewall Adapter*	Polypropylene	Joint	Sidewall Kit*
	Polypropylene	Joint	Sidewall Retaining	Sidewall Adapter*	Polypropylene	Joint	Sidewall Kit*
	Adapter	Connector	Bracket*		Adapter	Connector
126-065 -- 201-100	ISAAL0303	IANS03	IATP0303	ISTAGL0303	3PPS-AD	3PPS-LB	3PPS-HLK

286-125 -- 501-125	ISAAL0404	IANS04	IATP0404	ISTAGL0404	4PPS-AD	4PPS-LB	4PPS-HLK

* These parts are only needed if the sidewall termination assembly is used (see FIG. 3-4B on page 25).

Installation & Service Manual

2 General venting

Stainless steel vent

This product has been approved for use with stainless steel using the manufacturers listed in Table 2G.

WARNING Use only the materials, vent systems, and terminations listed in Tables 2G and 2H.

DO NOT mix vent systems of different types or manufacturers. Failure to comply could result in severe personal injury, death, or substantial property damage.

	NOTICE	The installer must use a specific vent starter
	NOTICE	adapter at the flue collar connection,
		supplied by the vent manufacturer to
		adapt to its vent system. See Table 2H for
		approved vent adapters. Discard CPVC
		starter piece.
		Installations must comply with applicable
	NOTICE	Installations must comply with applicable
	NOTICE	national, state, and local codes. Stainless
		steel vent systems must be listed as a
		UL-1738 approved system for the United
		States and a ULC-S636 approved system
		for Canada.

Table 2G Stainless Steel Vent Pipe and Fittings

NOTICE	Installation of a stainless steel vent system
NOTICE	should adhere to the stainless steel vent
	manufacturer’s installation instructions
	supplied with the vent system.

Figure 2-9 Near Water Heater Stainless Steel Venting

3" S.S. ADAPTER

4" S.S. ADAPTER

MODELS: 126-065 - 201-100

IMG00470

MODELS: 286-125 - 501-125

Approved Stainless Steel Vent Manufacturers

Make	Model
Dura Vent (M & G Group)	FasNSeal Vent / FasNSeal Flex* Vent
Z-Flex (Nova Flex Group)	Z-Vent

Heat Fab (Selkirk Corporation)	Saf-T Vent
Metal Fab	Corr/Guard

*Use of FasNSeal Flex smooth inner wall vent is to be used in vertical or near vertical sections only, taking precaution to ensure no sagging occurs of the vent system. Connect to the FasNSeal rigid vent using specially designed adapters and sealing method, see manufacturer’s instructions.

Table 2H Approved Stainless Steel (S.S.) Terminations and Adapters

		ProTech			Heat Fab				Z Flex
Model		FasNSeal			Saf-T Vent				Z-Vent

	S.S.	Flue	Intake	S.S.		Flue	Intake	S.S.	Flue	Intake Air
			Intake				Intake
			Air				Air
	Adapter	Termination	Air	Adapter		Termination	Air	Adapter	Termination	Termination
	Adapter	Termination	Termination	Adapter		Termination	Termination	Adapter	Termination	Termination
126-065 -- 201-125	300715	FSBS3	303889	9301PVC		9392	9314TERM	2SVSLA03	2SVSTP03	2SVSTEX0390
126-065 -- 201-125	300715	FSRC3(R.C)	303889	9301PVC		5300CI	9314TERM	2SVSLA03	2SVSRCX03	2SVSTEX0390
286-125 -- 501-125	F303759	FSBS4	FSAIH04	9401PVC		9492	9414TERM	2SVSLA04	2SVSTP04	2SVSTEX0490
286-125 -- 501-125	F303759	FSRC4(R.C.)	303888	9401PVC		5400CI	9414TERM	2SVSLA04	2SVSRCX04	2SVSTEX0490
	Metal	Fab
	Corr/Guard
126-065 -- 201-125	3CGIA	3CGSWHT	3CGSW90LT
126-065 -- 201-125	3CGIA	3CGSWC	3CGSW90LT
		3CGSWC
286-125 -- 501-125	4CGIA	4CGSWHT	4CGSW90LT
286-125 -- 501-125	4CGIA	4CGSWC	4CGSW90LT
		4CGSWC

3 Sidewall direct venting

Vent/air termination – sidewall

WARNING

Follow instructions below when determining vent location to avoid possibility of severe personal injury, death, or substantial property damage.

A gas vent extending through an exterior wall shall not terminate adjacent to a wall or below building extensions such as eaves, parapets, balconies, or decks. Failure to comply could result in severe personal injury, death, or substantial property damage.

Determine location

Locate the vent/air terminations using the following guidelines:

1.The total length of piping for vent or air must not exceed the limits given in the General Venting Section on page 17 of this manual.

2.You must consider the surroundings when terminating the vent and air:

a.Position the vent termination where vapors will not damage nearby shrubs, plants or air conditioning equipment or be objectionable.

b.The flue products will form a noticeable plume as they condense in cold air. Avoid areas where the plume could obstruct window views.

c.Prevailing winds could cause freezing of condensate and water/ice buildup where flue products impinge on building surfaces or plants.

d.Avoid possibility of accidental contact of flue products with people or pets.

e.Do not locate the terminations where wind eddies could affect performance or cause recirculation, such as inside building corners, near adjacent buildings or surfaces, window wells, stairwells, alcoves, courtyards, or other recessed areas.

WARNING	Sidewall vent and air inlet terminations
	must terminate in the same pressure
	zone.

f.Do not terminate above any door or window. Condensate can freeze, causing ice formations.

g.Locate or guard vent to prevent condensate damage to exterior finishes.

Installation & Service Manual

Figure 3-1A PVC/CPVC/Polypropylene Sidewall Termination

of Air and Vent

	TO BOILER
	INTAKE AIR
	CONNECTION
FROM BOILER
VENT PIPE
CONNECTION
POSSIBLE ORIENTATIONS		12"
POSSIBLE ORIENTATIONS		MIN
		TO
		OVER-
		HANG
	VENT / AIR
	TERMINATION
		12"
		MIN
	GRADE OR
	SNOW LINE
Table 3A Sidewall Vent Kits
Model	Kit Number	Vent Size
126-065 -- 201-100	KIT30045	3 inch vent
286-125 -- 501-125	KIT30046	4 inch vent

If using the alternate sidewall termination:

3. The air piping must terminate in a down-turned elbow as shown in FIG. 3-1B. This arrangement avoids recirculation of flue products into the combustion air stream.

4. The vent piping must terminate in an elbow pointed outward or away from the air inlet, as shown in FIG. 3-1B.

WARNING Do not exceed the maximum lengths of the outside vent piping shown in FIG. 3-1B.

Excessive length exposed to the outside could cause freezing of condensate in the vent pipe, resulting in potential water heater shutdown.

Figure 3-1B Alternate PVC/CPVC/Polypropylene Sidewall Termination of Air and Vent w/Field Supplied Fittings

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