Lochinvar 800 User Manual

Installation & Operation Manual

Models: 399 - 800

This manual must only be used by a qualified heating installer / service technician. Read all instructions, including this manual and the Knight XL Service Manual, before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.

 WARNING

Save this manual for future reference.

KBX-I-O Rev G

Contents

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.

HAZARD DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2

PLEASE READ BEFORE PROCEEDING . . . . . . . . . . . . 3

THE KNIGHT XL -- HOW IT WORKS . . . . . . . . . . . . . . . 4-6

RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1. DETERMINE BOILER LOCATION

Provide Air Openings to Room . . . . . . . . . . . . . . . . . . . . 10

Flooring and Foundation . . . . . . . . . . . . . . . . . . . . . . . . 10

Residential Garage Installation . . . . . . . . . . . . . . . . . . . . 10

Vent and Air Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Prevent Combustion Air Contamination . . . . . . . . . . . . . . 10

Corrosive Contaminants and Sources . . . . . . . . . . . . . . . 11

Using an Existing Vent System to Install a New Boiler . . 11

Removing a Boiler from Existing Common Vent . . . . . . . 12

2. PREPARE BOILER

Remove Boiler from Wood Pallet . . . . . . . . . . . . . . . . . . 13

Gas Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Model 399 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Model 500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Models 600 - 800 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Leveling the Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3. GENERAL VENTING

Direct Venting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-16

Install Vent and Combustion Air Piping . . . . . . . . . . . . . . 17

PVC/CPVC Vent Piping Materials . . . . . . . . . . . . . . . 17

Requirements for Installation in Canada . . . . . . . . . . . . . 17

Installing Vent or Air Piping . . . . . . . . . . . . . . . . . . . . . . . 17-18

PVC/CPVC Air Intake/Vent Connections . . . . . . . . . . . . . 18

Air Inlet Pipe Materials . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Stainless Steel Air Intake/Vent Connections . . . . . . . . . . 20

Min./Max. Combustion Air & Vent Piping Lengths . . . . . . 21

Vent and Air Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Optional Room Air . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-22

4. SIDEWALL DIRECT VENTING

Vent/Air Termination - Sidewall . . . . . . . . . . . . . . . . . . . . 23-26

Determine Location . . . . . . . . . . . . . . . . . . . . . . . . . . 23-25

Prepare Wall Penetrations . . . . . . . . . . . . . . . . . . . . . 25-26

Termination and Fittings . . . . . . . . . . . . . . . . . . . . . . . 26

Multiple Vent/Air Terminations . . . . . . . . . . . . . . . . . . 26

Sidewall Termination - Optional Concentric Vent . . . . . . 27-29

5. VERTICAL DIRECT VENTING

Vent/Air Termination - Vertical . . . . . . . . . . . . . . . . . . . . . 30-31

Determine Location . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Prepare Roof Penetrations . . . . . . . . . . . . . . . . . . . . . 31

Termination and Fittings . . . . . . . . . . . . . . . . . . . . . . . 31

Multiple Vent/Air Terminations . . . . . . . . . . . . . . . . . . 31

Vertical Termination - Optional Concentric Vent . . . . 32-33

6. HYDRONIC PIPING

System Water Piping Methods . . . . . . . . . . . . . . . . . . . . 34

Low Water Cutoff Device . . . . . . . . . . . . . . . . . . . . . . . . . 34

Chilled Water System . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Freeze Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

General Piping Information . . . . . . . . . . . . . . . . . . . . . . . 34

Flow Switch and Relief Valve Installation . . . . . . . . . . . . 35

Flow Switch Adjustment . . . . . . . . . . . . . . . . . . . . . . . 36

Circulator Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Near Boiler Piping Connections . . . . . . . . . . . . . . . . . . . 36

Near Boiler Piping Components . . . . . . . . . . . . . . . . . . . 38

7. GAS CONNECTIONS

Connecting Gas Supply Piping . . . . . . . . . . . . . . . . . . . . 41

Natural Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Pipe Sizing for Natural Gas . . . . . . . . . . . . . . . . . . . . 42

Natural Gas Supply Pressure Requirements . . . . . . . 42

Propane Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Pipe Sizing for Propane Gas . . . . . . . . . . . . . . . . . . . 42

Propane Supply Pressure Requirements . . . . . . . . . . 42

Check Inlet Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Gas Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . 44

8. FIELD WIRING

Line Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . 45

Low Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . 46

Wiring of the Cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

9. CONDENSATE DISPOSAL

Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

10. STARTUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50-55

11. OPERATING INFORMATION

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Cascade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58-59

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Knight XL Control Module . . . . . . . . . . . . . . . . . . . . . . . . 61-62

Status Display Screens . . . . . . . . . . . . . . . . . . . . . . . . . . 63-66

12. MAINTENANCE

Maintenance and Annual Startup . . . . . . . . . . . . . . . . . . 67-71

13. DIAGRAMS

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Ladder Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Revision Notes . . . . . . . . . . . . . . . . . . . . . . . . . Back Cover

Installation & Operation Manual

Please read before proceeding

Installer – Read all instructions, including this manual and the Knight XL Service Manual, before installing. Perform steps in the order given.

User – This manual is for use only by a qualified heating installer/service technician. Refer to the User’s Information Manual for your reference.

Have this boiler 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.

Failure to adhere to the guidelines on this page can result in severe personal injury, death, or substantial property damage.

When servicing boiler –

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

• To avoid severe burns, allow boiler to cool before performing maintenance.

Boiler operation –

• Do not block flow of combustion or ventilation air to

the boiler.

• 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 boiler 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.

Boiler water –

• Thoroughly flush the system (without boiler

connected) to remove sediment. The high-efficiency heat exchanger can be damaged by build-up or corrosion due to sediment.

• Do not use petroleum-based cleaning or sealing

compounds in the boiler system. Gaskets and seals in the system may be damaged. This can result in substantial property damage.

• Do not use “homemade cures” or “boiler patent

medicines”. Serious damage to the boiler, personnel, and/or property may result.

• Continual fresh make-up water will reduce boiler life.

Mineral buildup in the heat exchanger reduces heat transfer, overheats the stainless steel heat exchanger, and causes failure. Addition of oxygen carried in by makeup water can cause internal corrosion in system components. Leaks in boiler or piping must be repaired at once to prevent makeup water.

Freeze protection fluids –

• NEVER use automotive antifreeze. Use only inhibited

propylene glycol solutions, which are specifically formulated for hydronic systems. Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems.

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

Consider piping and installation when determining boiler 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.

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

This appliance MUST NOT be installed in any location where gasoline or flammable vapors are likely to be present.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric 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

NOTICE

 WARNING

Installation & Operation Manual

The Knight XL - How it works...

1. Stainless steel heat exchanger

Allows system 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.

2. Heat exchanger access cover

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

3. Blower

The blower pulls in air and gas through the venturi (item

5). Air and gas mix inside the blower and are pushed into the burner, where they burn inside the combustion chamber.

4. 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.

5. Venturi

The venturi controls air and gas flow into the burner.

6. Flue gas sensor

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

7. Boiler outlet temperature sensor

This sensor monitors boiler outlet water temperature (system supply). If selected as the controlling sensor, the control module adjusts boiler firing rate so the outlet temperature is correct.

8. Boiler inlet temperature sensor

This sensor monitors return water temperature (system return). If selected as the controlling sensor, the control module adjusts the boiler firing rate so the inlet temperature is correct.

9. Temperature and pressure gauge (field installed, not shown)

Monitors the outlet temperature of the boiler as well as the system water pressure.

10. Electronic display

The electronic display consists of 7 buttons and a dual line 32character liquid crystal display.

11. Flue pipe adapter

Allows for the connection of the PVC vent pipe system to the boiler.

12. Burner (not shown)

Made with metal fiber and stainless steel construction, the burner uses pre-mixed air and gas and provides a wide range of firing rates.

13. Water outlet (system supply)

A 1-1/2" or 2" NPT (depending on the model) water connection that supplies hot water to the system.

14. Water inlet (system return)

A 1-1/2" or 2" NPT (depending on the model) water connection that returns water from the system to the heat exchanger.

15. Gas connection pipe

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

16. SMART Control Module

The SMART Control responds to internal and external signals and controls the blower, gas valve, and pumps to meet the heating demand.

17. Automatic air vent

Designed to remove trapped air from the heat exchanger coils.

18. Air intake adapter

Allows for the connection of the PVC air intake pipe to the boiler.

19. High voltage junction box

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

20. Boiler drain port

Location from which the heat exchanger can be drained.

21. Low voltage connection board

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

22. Low voltage wiring connections (knockouts)

Conduit connection points for the low voltage connection board.

23. Condensate drain connection

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

24. Access cover - front

Provides access to the gas train and the heat exchanger.

25. Ignition electrode

Provides direct spark for igniting the burner.

26. Flame inspection window

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

27. Gas shutoff valve

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

28. High limit

Device that monitors the outlet water temperature. If the temperature exceeds its setting, it will break the control circuit, shutting the boiler down.

29. Relief valve

Protects the heat exchanger from an over pressure condition. The relief valve will be set at 50 PSI.

30. Flame sensor

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

31. Line voltage wiring connections (knockouts)

Conduit connection points for the high voltage junction box.

32. Top panel

Removable panel to gain access to the internal components.

33. Power switch

Turns 120 VAC ON/OFF to the boiler.

34. Leveling legs

Used to allow the heat exchanger to be leveled. This is needed for the proper draining of the condensate from the combustion chamber.

35. Air shroud (Model 500 only)

The air shroud controls air and gas flow into the burner.

Installation & Operation Manual

Front View - Model 399

Left Side (inside unit) - Model 399

Right Side (inside unit) - Model 399

The Knight XL - How it works... (continued)

Rear View - Model 399

Model 399

36. Air pressure switch

The air pressure switch detects blocked flue/inlet conditions.

37. Pump relay board

The pump relay board is used to connect the boiler, system and DHW pumps.

4 5

Installation & Operation Manual

The Knight XL - How it works...

Rear View - Model 500

Rear View - Models 600 - 800 Left Side (inside unit) - Models 600 - 800

Left Side (inside unit) - Model 500

Model 500

Models 600 - 800

Installation & Operation Manual

Ratings

Notes:

1. The ratings are based on standard test procedures prescribed by the United States Department of Energy.

2. Net I=B=R ratings are based on net installed radiation of sufficient quantity for the requirements of the building and nothing need be added for normal piping and pickup. Ratings are based on a piping and pickup allowance of 1.15.

3. Knight XL boilers require special gas venting. Use only the vent materials and methods specified in the Knight XL Installation and Operation Manual.

4. Standard Knight XL boilers are equipped to operate from sea level to 4,500 feet only with no adjustments. The boiler will de-rate by 4% for each 1,000 feet above sea level up to 4,500 feet.

5. High altitude Knight XL boilers are equipped to operate from 3,000 to 12,000 feet only with no field adjustments. The boiler 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 boilers. A high altitude label (as shown in FIG. A) is also affixed to the unit.

6. Ratings have been confirmed by the Hydronics Institute, Section of AHRI.

Maximum allowed working pressure is located on the rating plate.

NOTICE

Knight XL Boiler

I=B=R Rating

Model Number

Note: Change “N” to

“L” for L.P. gas models.

Input MBH

(Note 4)

Min Max

Gross

Output

MBH

(Note 1)

Net

I=B=R

Ratings

Water,

MBH

(Note 2)

KBN399 80 399 373 324

KBN500 100 500 467 406

KBN600 120 600 567 493

KBN700 140 700 660 574

KBN800 160 800 752 654

Other Specifications

Boiler

Water Content Gallons

Water

Connections

Gas

Connections

Air

Size

Vent

Size

(Note 3)

3.4 1-1/2" 1" 4" 4"

4.2 1-1/2" 1" 4" 4"

4.2 2" 1" 4" 4"

5.0 2" 1" 4" 6"

5.7 2" 1" 4" 6"

Figure A High Altitude Label Location

UNIT EQUIPPED FOR

3,000 FT. TO 12,000 FT.

HIGH ALTITUDE

Installation & Operation Manual

The Knight XL gas manifold and controls met safe lighting and other performance criteria when the boiler underwent tests specified in ANSI Z21.13 – latest edition.

Failure to keep boiler area clear and free of combustible materials, gasoline, and other flammable liquids and vapors can result in severe personal injury, death, or substantial property damage.

Installation must comply with:

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

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

• Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1, when required.

• National Electrical Code.

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

Before locating the boiler, check:

1. Check for nearby connection to:

• System 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. The pan must not restrict combustion air flow. 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 boiler. Remove any combustible

materials, gasoline and other flammable liquids.

4. The Knight XL must be installed so that gas control

system components are protected from dripping or spraying water or rain during operation or service.

5. If a new boiler will replace an existing boiler, check for

and correct system problems, such as:

• System leaks causing oxygen corrosion or heat exchanger cracks from hard water deposits.

• Incorrectly-sized expansion tank.

• Lack of freeze protection in boiler water causing system and boiler to freeze and leak.

 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 (37.8°C).

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

Provide clearances:

Clearances from combustible materials

1. Hot water pipes—at least 1" (25 mm) from combustible materials.

2. Vent pipe – at least 1" (25 mm) 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 boiler without removing it from the space.

Closet and alcove installations

This appliance requires a special venting system. The vent connection to the appliance must be made with the starter CPVC/stainless steel pipe section provided with the appliance. The field provided PVC 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.

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.

 WARNING

NOTICE

 WARNING

1 Determine boiler location

A closet is any room the boiler is installed in which is less than 171 cubic feet for KBN399 models, 193 cubic feet for KBN500 models, 223 cubic feet for KBN600 models, 247 cubic feet for KBN700 models and 278 cubic feet for KBN800 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 = 5 feet long, 4 feet wide, and 8 foot ceiling = 5 x 4 x 8 = 160 cubic feet. This would be considered a closet for a Knight XL Boiler.

Installation & Operation Manual

1 Determine boiler location (continued)

Figure 1-2 Alcove Installation - Minimum Required Clearances

6" (152 MM)

13" (330 MM)

TOP

CLOSET INSTALLATION

1" (25 MM) MINIMUM CLEARANCE AROUND HOT WATER PIPES AND VENT PIPE

VENTILATING* AIR OPENING

CLOSED DOOR

VENTILATING* AIR OPENING

RIGHT

6" (152 MM)

F RONT

14" (356 MM)

REAR

12" (305 MM)

LEFT

*AREA OF EACH OPENING: 1 SQ. INCH PER 1000 BTU PER HOUR INPUT WITH A MINIMUM OF 100 SQ. INCHES

Figure 1-1 Closet Installation - Minimum Required Clearances

 WARNING

For closet installations, CPVC or stainless steel material MUST BE used in a closet structure due to elevated temperatures. Failure to follow this warning could result in fire, personal injury, or death.

RECOMMENDED SERVICE CLEARANCES:

Front - 30" (762 mm) Top - 24" (610 mm) Left Side - 24" (610 mm) Rear - 24" (610 mm)

RECOMMENDED SERVICE CLEARANCES:

Front - 30" (762 mm) Top - 24" (610 mm) Left Side - 24" (610 mm) Rear - 24" (610 mm)

 WARNING

For alcove installations, CPVC or stainless steel 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.

1" (25 MM) MINIMUM CLEARANCE AROUND HOT WATER PIPES AND VENT PIPE

12"

(305 MM)

LEFT

ALCOVE INSTALLATION

13" (330 MM)

TOP

OPEN

FRONT

14" (356 MM)

REAR

18" (457 MM)

FRONT

RIGHT

Installation & Operation Manual

1 Determine boiler location

Provide air openings to room:

Knight XL alone in boiler room

1. No air ventilation openings into the boiler room are needed when clearances around the Knight XL are at least equal to the SERVICE clearances shown in FIG.’s 1-1 and 1-2. For spaces that do NOT supply this clearance, provide two openings as shown in FIG. 1-1. Each opening must provide one square inch free area per 1,000 Btu/hr of boiler input.

Knight XL in same space with other gas or oil-fired appliances

1. Follow the National Fuel Gas Code (U.S.) or CSA B149.1 (Canada) to size/verify size of the combustion/ventilation air openings into the space.

The space must be provided with combustion/ventilation air openings correctly sized for all other appliances located in the same space as the Knight XL.

Do not install the boiler in an attic.

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

2. Size openings only on the basis of the other appliances in the space. No additional air opening free area is needed for the Knight XL because it takes its combustion air from outside (direct vent installation).

Do not install the boiler on carpeting even if foundation is used. Fire can result, causing severe personal injury, death, or substantial property damage.

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

Flooring and foundation

Flooring

The Knight XL is approved for installation on combustible flooring, but must never be installed on carpeting.

Residential garage installation

Precautions

Take the following precautions when installing the appliance in a residential garage. If the appliance is located in a residential garage, it should be installed in compliance with the latest edition of the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA-B149 Installation Code.

• Appliances located in residential garages and in adjacent spaces that open to the garage and are not part of the living space of a dwelling shall be installed so that all burners and burner ignition devices are located not less than 18 inches (46 cm) above the floor.

• The appliance shall be located or protected so that it is

not subject to physical damage by a moving vehicle.

Vent and air piping

The Knight XL requires a special vent system, designed for pressurized venting.

The boiler is to be used for either direct vent installation or for installation using indoor combustion air. When room air is considered, see the General Venting Section. Note prevention of combustion air contamination below when considering vent/air termination.

Vent and air must terminate near one another and may be vented vertically through the roof or out a side wall, unless otherwise specified. You may use any of the vent/air piping methods covered in this manual. Do not attempt to install the Knight XL using any other means.

Be sure to locate the boiler such that the vent and air piping can be routed through the building and properly terminated. The vent/air piping lengths, routing and termination method must all comply with the methods and limits given in this manual.

Prevent combustion air contamination

Install air inlet piping for the Knight XL as described in this manual. Do not terminate vent/air in locations that can allow contamination of combustion air. Refer to Table 1A, page 11 for products and areas which may cause contaminated combustion air.

You must pipe combustion air to the boiler air intake. Ensure that the combustion air will not contain any of the contaminants in Table 1A, page 11. Contaminated combustion air will damage the boiler, 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.

 WARNING

Installation & Operation Manual

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

Table 1A Corrosive Contaminants and Sources

1 Determine boiler location (continued)

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

 WARNING

When using an existing vent system to install a new boiler:

Check the following venting components before installing:

•Material- For materials listed for use with this appliance, see Section 3 - General Venting, Table 3A. For stainless steel venting, an adapter of the same manufacturer (Table 3B) must be used at the flue collar connection.

•Size- To ensure proper pipe size is in place, see Table 3D. Check to see that this size is used throughout the vent system.

• Manufacturer - For a stainless steel application, you must use only the listed manufacturers and their type product listed in Table 3A 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 3 through 5 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 3B 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 Boiler Section on page 12.

With 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 17.

 WARNING

If any of these conditions are not met, 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.

Installation & Operation Manual

1 Determine boiler location

When removing a boiler from existing common vent system:

Do not install the Knight XL 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.

At the time of removal of an existing boiler, 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.

 DANGER

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 & Operation Manual

2 Prepare boiler

Remove boiler from wood pallet

1. After removing the outer shipping carton from the boiler, remove the parts box.

2. Remove the front door to access the lag bolts in front of

the unit (FIG. 2-1).

3. To remove the boiler from the pallet (after removing the

front door):

a. Remove the two lag bolts from the wood pallet

inside the boiler (FIG. 2-1).

b. Detach the boiler from the lag bolts in the rear of the

unit, see FIG. 2-1.

Do not drop the boiler or bump the jacket on the floor or pallet. Damage to the boiler can result.

For a boiler already installed, you must turn off gas supply, turn off power and allow boiler to cool before proceeding. You must also completely test the boiler after conversion to verify performance as described under Start-up, Section 10 of this manual. Failure to comply could result in severe personal injury, death, or substantial property damage.

For the 399 Model you must install a propane orifice to operate the Knight XL on propane gas. Verify when installing that the orifice size marking matches boiler size (Model 399 - 8.0 LP orifice stamping).

Models 500 - 800 do not require an orifice installation for propane operation, but they will require a valve adjustment.

Figure 2-1 Boiler Mounted on Shipping Pallet

Gas conversions

NOTICE

 WARNING

Figure 2-2 Installing Propane Orifice - Model 399

Model 399

1. Remove the top and front access covers from the unit (no tools required for removal).

2. Remove the three screws securing the venturi to the blower.

Note: When separating the venturi from the blower, take

care not to damage the O-ring inside the blower (FIG. 2-2).

3. Remove the four star-drive screws securing the gas valve to the venturi (FIG. 2-2).

4. Locate the propane orifice disk from the conversion kit bag. Verify that the stamping on the orifice disk matches the boiler size (Model 399 - 8.0 LP orifice stamping).

5. Remove the existing orifice from the O-ring in the side of the gas valve and replace it with the orifice from the kit. Position and secure the orifice in the valve as shown in FIG. 2-2.

6. Reposition the gas valve against the venturi and replace the star-drive screws (FIG. 2-2) securing the valve to the venturi.

7. Inspect the O-ring inside the blower. Handle the O-ring with care, do not damage. Reposition the venturi against the blower and replace the screws securing the venturi to the blower (FIG. 2-2).

8. After installation is complete, attach the propane conversion label (in the conversion kit bag) next to the boiler rating plate. Attach the LP caution label (in the conversion kit bag) to the left side of the unit in the lower left corner.

9. Replace the top and front access covers.

 DANGER

Model 399: Inspect the O-ring when the blower is disassembled. The O-ring must be in good condition and must be installed. Failure to comply will cause a gas leak, resulting in severe personal injury or death.

 WARNING

After converting to LP, check combustion per the Start-up procedure in Section 10 of this manual. Failure to check and verify combustion could result in severe personal injury, death, or substantial property damage.

BLOWER

O-RING

VENTURI

SCREWS QTY. 3

SCREWS QTY. 4

O-RING

BRASS ORIFICE

GAS VALVE

Installation & Operation Manual

2 Prepare boiler

Figure 2-5 Leveling Legs on the Boiler

Leveling the boiler

1. Set the boiler in place and check level. a) Adjust legs if necessary to level boiler, see FIG. 2-5

below.

Figure 2-3 Gas Valve Adjustment - Model 500

Model 500

1. Remove the top access cover from the unit (no tools required for removal).

2. Turn the adjustment screw on the gas valve clockwise until it stops. Then turn the adjustment screw counterclockwise four and three quarter (4 3/4) turns (see FIG. 2-3).

3. Use a combustion analyzer to verify CO

is within the range

of 9.6 – 10.5%. If not, adjust the screw counterclockwise incrementally to raise CO

and clockwise to lower CO

(FIG. 2-3).

4. After adjustment is complete, attach the propane conversion label (in the conversion kit bag) next to the boiler rating plate. Attach the LP caution label (in the conversion kit bag) to the left side of the unit in the lower left corner.

5. Replace the top access cover.

Figure 2-4 Gas Valve Adjustment - Models 600 - 800

Models 600 - 800

1. Remove the top access cover from the unit (no tools required for removal).

2. Remove the cover on top of the gas valve (FIG. 2-4).

3. Turn the adjustment screw on top of the gas valve clockwise one and three quarter (1 3/4) turns on the 600 Model, one and a half (1 1/2) turns on the 700 Model, and one turn on the 800 Model (see FIG. 2-4).

4. Use a combustion analyzer to verify CO

is within the range

of 9.6 – 10.5%. If not, adjust the screw counterclockwise incrementally to raise CO2and clockwise to lower CO

(FIG. 2-4).

5. After adjustment is complete, attach the propane conversion label (in the conversion kit bag) next to the boiler rating plate. Attach the LP caution label (in the conversion kit bag) to the left side of the unit in the lower left corner.

6. Replace the gas valve cover along with the top access cover.

 WARNING

COVER

LLEN WRENCH

ADJUSTMENT SCREW

ALLEN WRENCH

ADJUSTMENT SCREW

SCREWDRIVER SLOT

LOWER

RAISE

Installation & Operation Manual

PVC/CPVC Two Pipe

See Figure 4-1A

Models 399 - 600 Only

PVC/CPVC Alternate

Two Pipe

See Figure 4-2A

Stainless Steel

Alternate Two Pipe

See Figure 4-2B

Stainless Steel

Two Pipe

See Figure 4-1C

Models 399 - 600 Only

PVC/CPVC Concentric

See Figure 4-7

Models 399 - 600 Only

Direct venting options - Sidewall Vent

3 General venting

Installation & Operation Manual

Direct venting options - Vertical Vent, Sidewall Air

3 General venting

Direct venting options - Vertical Vent

PVC/CPVC

Two Pipe

See Figure 5-1A

Stainless Steel

Two Pipe

See Figure 5-1B

PVC/CPVC

Concentric

See Figure 5-5

PVC/CPVC

Vertical Vent, Sidewall Air

Stainless Steel

Vertical Vent, Sidewall Air

Stainless steel vent/air design and terminations will vary slightly by manufacturer.

NOTICE

Installation & Operation Manual

3 General venting (continued)

PVC/CPVC vent piping materials

Use only the materials listed in Table 3A (pg. 18) for vent pipe, and fittings. Failure to comply could result in severe personal injury, death, or substantial property damage.

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.

Install vent and combustion air piping

 DANGER

The Knight XL 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.

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 boiler (to allow drainage of condensate).

This appliance requires a special venting system. 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. For stainless steel venting use an adapter from Table 3B (pg. 20) that corresponds with the intended vent manufacturer to be used and discard the CPVC starter piece. 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 this manual to make the vent connections. Failure to follow this warning could result in fire, personal injury, or death.

 WARNING

NOTICE

 WARNING

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

NOTICE

Requirements for installation in Canada

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

IPEX is an approved vent manufacturer in Canada supplying vent material listed 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.

Installing vent or air piping

Improper installation of PVC or CPVC systems may result in injury or death.

 CAUTION

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

NOTICE

1. Work from the boiler 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.

Installation & Operation Manual

3 General venting

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.

c. Apply a liberal even coat of primer to the pipe end to

approximately 1/2" beyond the socket depth. d. Apply a second primer coat to the fitting socket. e. While primer is still wet, apply an even coat of

approved cement to the pipe equal to the depth of

the fitting socket.

f. While primer is still wet, apply an even coat of

approved cement to the fitting socket. g. Apply a second coat of cement to the pipe. h. 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. j. Wipe excess cement from the joint removing ring or

beads as it will needlessly soften the pipe.

Table 3A Vent Pipe, and Fittings

PVC/CPVC air intake/vent connections

1. Combustion Air Intake Connector (FIG.’s 3-9 and 3-10) - 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 3-9 and 3-10) - Used to provide a passageway for conveying combustion gases to the outside. Transition fittings are provided with 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 3-10 Near Boiler PVC/CPVC Venting Models 700 - 800

Figure 3-9 Near Boiler PVC/CPVC Venting - Models 399 - 600

All vent pipe materials and fittings must comply with the following:

Item Material

Standards for installation in:

United States Canada

Vent pipe and fittings

PVC schedule 40 ANSI/ASTM D1785

CPVC and PVC venting must be ULC-

S636 Certified. IPEX is an approved

manufacturer in Canada supplying vent

material listed to ULC-S636.

PVC-DWV ANSI/ASTM D2665

CPVC schedule 40 ANSI/ASTM F441

AL29-4C UL1738 ULC-S636

Pipe cement/primer

PVC ANSI/ASTM D2564

IPEX System 636

Cements & Primers

CPVC ANSI/ASTM F493

NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE

Approved Stainless Steel Vent Manufacturers

Make Model

ProTech Systems (Simpson Dura-Vent Co.) FasNSeal Vent

Z-Flex (Nova Flex Group) Z-Vent

Heat Fab (Selkirk Corporation) Saf-T Vent

AIR

VENT

* 4” CPVC STREET ELBOW MAY BE SUBSTITUTED

4" CPVC PIPE SUPPLIED WITH BOILER MUST BE USED FOR VENT CONNECTION

NOTE: CPVC VENT PIPE AND VENT FITTINGS MUST BE USED IN CLOSET AND ALCOVE INSTALLATIONS.

VENT

AIR

6” COUPLING

(FIELD SUPPLIED)

6” CPVC

STARTER

PIECE

(FACTORY SUPPLIED)

THE 6” STAINLESS STEEL ADAPTER SUPPLIED WITH THE BOILER MUST BE USED FOR VENT CONNECTION TO PVC/CPVC. THE 6” CPVC STARTER PIECE MUST BE USED FOR PVC ONLY.

Installation & Operation Manual

3 General venting (continued)

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 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.

 WARNING

Using vent or air intake materials other than those specified, failure to properly seal all seams and joints or failure to follow vent pipe manufacturer’s instructions can result in personal injury, death or property damage. Mixing of venting materials will void the warranty and certification of the appliance.

NOTICE

The use of double-wall vent or insulated 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 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.

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.

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

Stainless steel vent

This product has been approved for use with stainless steel using the manufacturers listed in Table 3A.

Use only the materials, vent systems, and terminations listed in Table 3B. DO NOT mix vent systems of different types or manufacturers, unless listed in this manual. Failure to comply could result in severe personal injury, death, or substantial property damage.

 WARNING

Installations must comply with applicable 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.

NOTICE

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

NOTICE

The installer must use a specific vent starter adapter at the flue collar connection, supplied by the vent manufacturer to adapt to its vent system. See Table 3B for approved vent adapters. Discard CPVC starter piece.

NOTICE

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 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.

Installation & Operation Manual

3 General venting

Figure 3-12 Near Boiler Stainless Steel Venting Models 700 - 800

Figure 3-11 Near Boiler Stainless Steel Venting Models 399 - 600

Table 3C Stainless Steel Vent Termination Kit(s)

Model Kit Number

700 - 800 KIT3137

Stainless steel air intake/vent connections

1. Combustion Air Intake Connector (FIG.’s 3-11 and 3-12) - 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 3-11 and 3-12) - 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.

Table 3B Approved Stainless Steel Terminations and Adapters

Model

ProTech Heat Fab Z Flex

FasNSeal Saf-T Vent Z-Vent

Boiler

Adapter

Flue

Termination

Intake

Air

Termination

Boiler

Adapter

Intermediate

Adapter

Flue

Termination

Intake

Air

Termination

Boiler

Adapter

Flue

Termination

Intake Air

Termination

399-600

F303759

FSBS4

FSRC4(R.C)

FSAIH04

303888

KB285600 9454BUREZ-1*

9492

5400CI

9414TERM 2SVSLA04

2SVSTP04

2SVSRCX04

2SVSTEX0490

700-800

F303759

(Intake

Only)

FSBS6

FSAIH04

303888

* = This adapter must be used in addition to the boiler adapter for Saf-T vent pipe as shown in FIG. 3-11, unless approved vent other than standard diameter is used. Consult a Heat Fab representative for questions.

VENT

4" S.S. ADAPTER

4" S.S. INTERMEDIATE

(FOR SAF-T VENT ONLY)

Installation & Operation Manual

Model Kit Number

Equivalent

Vent Length

399 CVK3007 5 Feet (1.5 m)

500 CVK3007 30 Feet (9 m)

600 CVK3007 30 Feet (9 m)

3 General venting (continued)

Vent, air piping and termination:

The Knight XL 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.

Removing from existing vent

Follow the instructions in Section 1, page 12 of this manual when removing a boiler from an existing vent system.

Vent and air piping

Vent and air system:

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.

You must also install air piping from outside to the boiler air intake adapter. The resultant installation is direct vent (sealed combustion).

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

DO NOT mix components from different systems. The vent system could fail, causing leakage of flue products into the living space. Use only approved stainless steel, PVC or CPVC pipe and fittings. For PVC/CPVC use with primer and cement specifically designed for the material used.

NOTICE

 WARNING

Table 3E Concentric Vent Kit Equivalent Vent Lengths

The appliance output rating will reduce by up to 1.5% for each 25 feet (68 m) of vent length.

NOTICE

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

Combustion Air = 12 equivalent feet (3.7 m) minimum / 100 equivalent feet (30.5 m) maximum

Ve n t = 12 equivalent feet (3.7 m) minimum / 100 equivalent feet (30.5 m) maximum

When determining equivalent combustion air and vent length, add 5 feet (1.5m) for each 90° elbow and 3 feet (.9 m) for each 45° elbow.

EXAMPLE: 20 feet (6 m) of PVC pipe + (3) 90° elbows + (3) 45° elbows + (1) concentric vent kit (CVK3007) = 49 equivalent feet (15 m) of piping.

Model Air Intake Vent

399 - 600 4 inches (102 mm) 4 inches (102 mm)

700 - 800 4 inches (102 mm) 6 inches (152 mm)

The Knight XL uses model specific combustion air intake and vent piping sizes as detailed in Table 3D below.

Table 3D Air Intake/Vent Piping Sizes

Increasing or decreasing combustion air or vent piping is not authorized.

NOTICE

Optional room air

Commercial applications utilizing the Knight XL boiler 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 kit (Table 3F).

• 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.

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

• Using the room air kit 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.

NOTICE

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

Installation & Operation Manual

3 General venting

If the boiler 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 11 before installing the boiler or air inlet piping.

If contaminants are found, you MUST:

• Remove products permanently. —OR—

• Relocate air inlet and vent

terminations to other areas.

 WARNING

Air contamination

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

Please read the information given in Table 1A, page 11, listing contaminants and areas likely to contain them. If contaminating chemicals will be present near the location of the boiler combustion air inlet, have your installer pipe the boiler combustion air and vent to another location, per this manual.

Model Description Kit Number

399 - 800

Filter Box Assembly KIT30022

90° Elbow with Screen KIT30053

Table 3F Optional Room Air Kit

 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 & Operation Manual

4 Sidewall direct venting

Vent/air termination – sidewall

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.

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

NOTICE

 WARNING

Do not connect any other appliance to the vent pipe or multiple boilers to a common vent pipe. 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 21 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.

Figure 4-1A PVC/CPVC Sidewall Termination of Air and Vent

Model Kit Number Vent Size

399 - 600 KIT30046 4 inch vent

700 - 800 KIT30048 6 inch vent

Table 4A Sidewall Vent Kits

Do not exceed the maximum lengths of the outside vent piping shown in FIG. 4-1B. Excessive length exposed to the outside could cause freezing of condensate in the vent pipe, resulting in potential boiler shutdown.

 WARNING

If using the alternate sidewall termination:

3. The air piping must terminate in a down-turned elbow as shown in FIG. 4-1B. 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.4-1B.

Figure 4-1B Alternate PVC/CPVC Sidewall Termination of Air and Vent w/Field Supplied Fittings

TO BOILER INTAKE AIR

CONNECTION

FROM BOILER

VENT PIPE

CONNECTION

POSSIBLE ORIENTATIONS

VENT / AIR

TERMINATION

GRADE OR

SNOW LINE

12"

MIN

TO OVERHANG

12"

MIN

+ 53 hidden pages