Lochinvar KBN081, KBN106, KBN151, KBN211, KBN286 Installation Manual

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Page 1

KBII-I-O Rev J

Installation & Operation Manual

Models: 81 - 286

 WARNING

Save this manual for future reference.

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

Page 2

Contents

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

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

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

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

1. DETERMINE BOILER LOCATION

Provide Clearances ............................................................ 8

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

Leveling the Boiler ...................................................... 13

3. GENERAL VENTING

Direct Venting Options ..................................................... 14

Install Vent and Combustion Air Piping ........................... 15

Requirements for Installation in Canada .......................... 16

Sizing ............................................................................... 16

Min./Max. Combustion Air & Vent Piping Lengths ............16

Materials ............................................................................17

Optional Room Air ............................................................ 18

PVC/CPVC ....................................................................... 19

Polypropylene ................................................................... 20

Stainless Steel Vent ......................................................... 21

4. SIDEWALL DIRECT VENTING

Vent/Air Termination - Sidewall ................................... 22-25

Determine Location ................................................ 22-24

Prepare Wall Penetrations .......................................... 24

Multiple Vent/Air Terminations ......................................... 25

Sidewall Termination - Optional Concentric Vent ....... 26-28

5. VERTICAL DIRECT VENTING

Vent/Air Termination - Vertical .................................... 29-30

Determine Location ..................................................... 29

Prepare Roof Penetrations ......................................... 30

Multiple Vent/Air Terminations .................................... 30

Vertical Termination - Optional Concentric Vent ... 31-32

Alternate Vertical Concentric Venting .................... 33-34

6. HYDRONIC PIPING

System Water Piping Methods ......................................... 35

Low Water Cutoff Device ................................................. 35

Chilled Water System ....................................................... 35

Freeze Protection ............................................................. 35

General Piping Information .............................................. 35

Relief Valve / T & P Installation ....................................... 36

Near Boiler Piping Components .................................. 36-37

Near Boiler Piping Connections ....................................... 37

Circulator Sizing ............................................................... 37

Variable Speed Pump Option .......................................... 39

7. GAS CONNECTIONS

Connecting Gas Supply Piping ................................... 47-48

Natural Gas ...................................................................... 48

Pipe Sizing for Natural Gas ........................................ 48

Natural Gas Supply Pressure Requirements ............. 48

Propane Gas .................................................................... 48

Pipe Sizing for Propane Gas ...................................... 48

Propane Supply Pressure Requirements ................... 48

Check Inlet Gas Supply ................................................... 49

Gas Pressure ................................................................... 50

Gas Valve Replacement .................................................. 50

8. FIELD WIRING

Line Voltage Connections ................................................ 51

Low Voltage Connections ................................................ 51

Wiring of the Cascade ...................................................... 53

9. CONDENSATE DISPOSAL

Condensate Drain ............................................................ 55

10. STARTUP ............................................................. 56-61

11. OPERATING INFORMATION

General ............................................................................. 62

Cascade ........................................................................... 65

Sequence of Operation ............................................... 66-67

Knight Boiler Control Module ...................................... 68-69

Status Display Screens ............................................... 70-72

12. MAINTENANCE

Maintenance and Annual Startup ................................ 73-77

13. DIAGRAMS

Ladder Diagram ............................................................... 78

Wiring Diagram................................................................. 79

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

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.

Page 3

Please read before proceeding

Installation & Operation Manual

 WARNING

NOTICE

 WARNING

Installer – Read all instructions, including this manual and the Knight Boiler 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.

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.

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

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.

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.

• 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.

 CAUTION

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.

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.

Page 4

The Knight Boiler - How it works...

Installation & Operation Manual

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. Combustion chamber 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 (limit rated)

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

7. Boiler outlet temperature sensor (housed with the high limit 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 LCD display

The electronic display consists of 4 buttons, a navigation dial and a multiple line liquid crystal display.

11. Flue pipe adapter

Allows for the connection of the vent 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)

NPT water connection that supplies hot water to the system, either 1" or 1-1/4", depending on the model.

14. Water inlet (system return)

NPT water connection that returns water from the system to the heat exchanger, either 1" or 1-1/4", depending on the model.

15. Gas connection pipe

Threaded pipe connection, either 1/2" or 3/4", 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 SYSTEM Control Module

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

17. Manual 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. Relief valve

Protects the heat exchanger from an over pressure condition. The relief valve provided with the unit is set at 30 psi.

28. Flame sensor

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

29. Line voltage wiring connections (knockouts)

Conduit connection points for the high voltage junction box.

30. Top panel

Removable panel to gain access to the internal components.

31. Power switch

Turns 120 VAC ON/OFF to the boiler.

32. 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.

33. Air pressure switch

The air pressure switch detects blocked inlet conditions.

34. Transformer

The transformer provides 24V power to the integrated control.

35. High limit sensor (housed with the outlet temperature sensor)

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

36. Gas shutoff switch

An electrical switch designed to cut power to the gas valve to prevent releasing any gas.

37. Over-temp switch (Model 286 Only) (located underneath access cover)

An electrical switch designed to shut down boiler 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.

Page 5

Installation & Operation Manual

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

Models 81 - 211

Front View - Models 81 - 211

Rear View - Models 81 - 211

Left Side (inside unit) - Models 81 - 211

Right Side (inside unit) - Models 81 - 211

Page 6

The Knight Boiler - How it works...

Model 286

Installation & Operation Manual

Front View - Model 286

Rear View - Model 286

Left Side (inside unit) - Model 286

Right Side (inside unit) - Model 286

Page 7

Ratings

Installation & Operation Manual

Knight Boiler

Other Specifications

AHRI Rating

Input

Model Number

Note: Change “N” to

“L” for L.P. gas models.

Max Min

KBN081 16 80 74 64 95 KBN106 21 105 97 84 95 KBN151 30 150 139 121 95

KBN211 42 210 196 170 95 KBN286 57 285 267 232 95

NOTICE

Maximum allowed working pressure is located on the rating plate.

MBH

(Note 5)

Heating

Capacity

MBH

(Note 2,7)

Net

AHRI

Ratings

Water,

MBH

(Note 3,7)

Notes:

1. As an Energy Star Partner, Lochinvar has determined that Knight boilers meet the Energy Star guidelines for energy efficiency.

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

3. Net AHRI 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.

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

5. Standard Knight 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.

6. High altitude Knight 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.

7. Ratings have been confirmed by the Hydronics Section of AHRI.

AFUE

(Note 1, 7)

Boiler

Water Content Gallons

0.6 1" 1/2" 3" 3"

0.7 1" 1/2" 3" 3"

1.3 1" 1/2" 3" 3"

1.7 1" 1/2" 3" 3"

2.4 1-1/4" 3/4" 4" 4"

Water

Connections

Gas

Connections

Air

Size

Vent Size

(Note 4)

8. Knight boilers comply with the requirements of CSD-1 Section CW-400 requirements as a temperature operation control. The manual reset high limit provided with the Knight is listed to UL353.

UNIT EQUIPPED FOR

HIGH ALTITUDE

3,000 FT. TO 12,000 FT.

Figure A High Altitude Label Location

Page 8

1 Determine boiler location

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.

NOTICE

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.

 WARNING

4. The Knight boiler 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.

The Knight boiler 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 & Operation Manual

 WARNING

Closet and alcove installations

A closet is any room the boiler is installed in which is less than 67 cubic feet for KBN081 and KBN106 models, 86 cubic feet for KBN151 models, 107 cubic feet for KBN211 models, and 120 cubic feet for KBN286 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 = 4 feet long, 3 feet wide, and 8 foot ceiling = 4 x 3 x 8 = 96 cubic feet. This would be considered a closet for a Knight Boiler.

 WARNING

Provide clearances:

Clearances from combustible materials

1. Hot water pipes—at least 1/4" (6 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.

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.

This appliance requires a special venting system. If using PVC the vent connection to the appliance must be made with the starter 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.

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

Page 9

1 Determine boiler location (continued)

Figure 1-1 Closet Installation - Minimum Required Clearances

Installation & Operation Manual

1" MINIMUM CLEARANCE

AROUND HOT WATER

PIPES AND VENT PIPE

12"

LEFT

14"

REAR

RECOMMENDED SERVICE CLEARANCES:

FRONT - 24” TOP - 24” LEFT SIDE - 24” REAR - 24”

CLOSET INSTALLATION

FRONT

 WARNING

13”

TOP

For closet installations, CPVC, polypropylene or stainless steel vent material MUST BE used in a closet structure due to elevated temperatures. Failure to follow

VENTILATING* AIR OPENING

CLOSED DOOR

VENTILATING* AIR OPENING

RIGHT

this warning could result in fire, personal injury, or death.

*AREA OF EACH OPENING:

1 SQ. INCH PER 1000 BTU PER HOUR INPUT WITH A MINIMUM OF 100 SQ. INCHES.

Figure 1-2 Alcove Installation - Minimum Required Clearances

1/4" (6 MM) MINIMUM CLEARANCE

ROUND HOT WATER PIPES

1” (25 MM) MINIMUM CLEARANCE

ROUND VENT PIPE

ALCOVE INSTALLATION

 WARNING

13”

TOP

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.

OPEN

12”

LEFT

14”

REAR

FRONT

0”

RIGHT

RECOMMENDED SERVICE CLEARANCES:

FRONT - 24” TOP - 24” LEFT SIDE - 24” REAR - 24”

18”

FRONT

Page 10

1 Determine boiler location

Installation & Operation Manual

Provide air openings to room:

Knight boiler alone in boiler room

1. No air ventilation openings into the boiler room are needed when clearances around the Knight boiler 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 boiler in same space with other gas or oilfired 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.

 WARNING

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 boiler because it takes its combustion air from outside (direct vent installation).

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

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.

Flooring and foundation

Flooring

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

 WARNING

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

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

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 boiler 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 Section 3, General Venting. 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 boiler 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 boiler 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.

 WARNING

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.

Page 11

1 Determine boiler location (continued)

Installation & Operation Manual

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

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

 WARNING

Check the following venting components before installing:

• Material - For materials listed for use with this appliance, see Section 3 - 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 3A. 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 3E and 3G 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 3H 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 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 19.

 WARNING

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

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.

Page 12

1 Determine boiler location

When removing a boiler from existing common vent system:

Installation & Operation Manual

 DANGER

 WARNING

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.

Do not install the Knight boiler 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 in flue gas spillage and carbon monoxide emissions, causing severe personal injury or death.

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.

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.

Page 13

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.

NOTICE

Figure 2-1 Boiler Mounted on Shipping Pallet

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

Installation & Operation Manual

5. 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.

6. Replace the top and front access covers.

Table 2A LP Conversion Table

LP Conversion Table

Model LP Orifice Stamping

81 80 106 105 151 150 211 210 / W150 286 285

 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.

. 2

Gas conversions

 WARNING

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

2. Remove the three screws securing the gas valve to the venturi (FIG. 2-2).

3. Locate the propane orifice disk from the conversion kit bag. Verify that the stamping on the orifice disk matches the boiler size (see Table 2A).

Place the orifice into the black rubber grommet in the

side of the gas valve and secure in the valve (FIG. 2-2).

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

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.

You must install a propane orifice to operate the Knight boiler on propane gas. Verify when installing that the orifice size marking matches boiler size (Table 2A).

Figure 2-2 Installing Propane Orifice

Leveling the boiler

1. Set the boiler in place and check level. a) Adjust legs if necessary to level boiler, see FIG. 2-3 below.

Figure 2-3 Leveling Legs on the Boiler

Page 14

3 General venting

Direct venting options - Sidewall Vent

Installation & Operation Manual

Figure 3-1 Two-Pipe Sidewall Termination - See page 22 for more details

Direct venting options - Vertical Vent

Figure 3-2 PVC/CPVC Concentric Sidewall Termination - See page 26 for more details

Figure 3-3 Two-Pipe Vertical Termination - See page 29 for more details

Figure 3-4 PVC/CPVC Concentric

Vertical Termination - See page 31 for more details

Figure 3-5 Vertical Vent, Sidewall Air - See page 21 for more details

Page 15

3 General venting (continued)

Install vent and combustion air piping

Installation & Operation Manual

 DANGER

 WARNING

NOTICE

 WARNING

The Knight boiler 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.

This appliance requires a special venting system. Use only approved stainless steel,

PVC, CPVC or polypropylene pipe and fittings listed in Tables 3D, 3E, and 3G 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.

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.

The Knight boiler 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 Knight boiler using any other means.

You must also install air piping from outside to the boiler air intake adapter unless following the Optional Room Air instructions on page 21 of this manual. The resultant installation is direct vent (sealed combustion).

Air intake/vent connections

1. Combustion Air Intake Connector (FIG. 3-6) - 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 3-7 thru 3-9) - 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 3-6 Near Boiler Air Piping

AIR

 CAUTION

NOTICE

 WARNING

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

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

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.

Page 16

3 General venting

Installation & Operation Manual

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 certified vent material to comply with this requirement.

4. The 3" Concentric Vent Kit available from Lochinvar (see

Section 4 – Sidewall Termination – Optional Concentric Vent) and the 3" Concentric Vent Kit available from IPEX are both approved for use on the Knight boiler. Both kits are listed to the ULC-S636 standard for use in Canada.

Sizing

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

Table 3A Air Intake/Vent Piping Sizes

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

Table 3B Concentric Vent Kit Equivalent Vent Lengths

Model Kit Number

81 - 211 CVK3003 3 feet

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

Equivalent Vent

Length

Model Air Intake Vent

81 - 211 3 inches 3 inches

286 4 inches 4 inches

NOTICE

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

286 CVK3007 3 feet

Page 17

3 General venting (continued)

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

NOTICE

Using air intake materials other than those specified can result in personal injury, death or property damage.

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.

Installation & Operation 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 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.

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.

Page 18

3 General venting

Installation & Operation Manual

Optional room air

NOTICE

Commercial applications utilizing the Knight 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 3C).

• 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.

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

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.

 WARNING

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 contaminants permanently. —OR—

• Relocate air inlet and vent terminations

to other areas.

 WARNING

Table 3C Optional Room Air Kit

Model Kit Number

81 - 211 KIT30052

286 KIT30053

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.

Page 19

3 General venting (continued)

Installation & Operation Manual

PVC/CPVC

This product has been approved for use with the PVC/CPVC vent materials listed in Table 3D.

Installing vent and air piping

 WARNING

NOTICE

 WARNING

Table 3D PVC/CPVC Vent Pipe, and Fittings

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 3D 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 boiler (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.

Approved PVC/CPVC Vent Pipe and Fittings

Item Material Standard

PVC Schedule 40, 80 ANSI/ASTM D1785

Vent pipe

Vent fittings

Pipe Cement /

Primer

NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE

PVC - DWV ANSI/ASTM D2665 CPVC Schedule 40, 80 ANSI/ASTM F441 PVC Schedule 40 ANSI/ASTM D2466 PVC Schedule 80 ANSI/ASTM D2467 CPVC Schedule 80 ANSI/ASTM F439 PVC ANSI/ASTM D2564 CPVC ANSI/ASTM F493

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.

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 3-7 Near Boiler PVC/CPVC Venting

NOTE: In Canada, CPVC and PVC vent pipe, ﬁ ttings and cement/ primer must be ULC-S636 certiﬁ ed.

Page 20

3 General venting

Polypropylene

This product has been approved for use with polypropylene vent with the manufacturers listed in Table 3E.

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.

Table 3E Polypropylene Vent Pipe and Fittings

Approved Polypropylene Vent Manufacturers

Make Model

Centrotherm Eco Systems

Duravent (M & G Group)

PolyPro Single-Wall / PolyPro Flex

InnoFlue SW/Flex

Installation & Operation Manual

 WARNING

NOTICE

Use only the adapters and vent system listed in Tables 3E and 3F. 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.

NOTICE

 WARNING

Table 3F Approved PolypropyleneTerminations

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

All vent connections MUST be secured by the vent manufacturer's joint connector (FIG. 3-8).

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.

Figure 3-8 Near Boiler Polypropylene Venting

POLYPROPYLENE ADAPTER

JOINT CONNECTOR REQUIRED AT ALL COMPONENT CONNECTIONS OF VENT SYSTEM

IMG00015

Centrotherm InnoFlue SW

Model

81 - 211

286

* These parts are only needed if the sidewall termination assembly is used (see FIG. 4-4B on page 24).

Polypropylene

Adapter

ISAAL0303 IANS03 IATP0303 ISTAGL0303 3PPS-AD 3PPS-LB 3PPS-HLK ISAAL0404 IANS04 IATP0404 ISTAGL0404 4PPS-AD 4PPS-LB 4PPS-HLK

Joint

Connector

Sidewall Retaining

Bracket*

Sidewall

Adapter*

Polypropylene

Adapter

Duravent Polypro

Joint

Connector

Sidewall Kit*

Page 21

3 General venting (continued)

Stainless steel vent

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

 WARNING

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

Installation & Operation Manual

NOTICE

Figure 3-9 Near Boiler Stainless Steel Venting

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

NOTICE

Table 3G Stainless Steel Vent Pipe and Fittings

Dura Vent (M & G Group) FasNSeal Vent / FasNSeal Flex* Vent Z-Flex (Nova Flex Group) Z-Vent Heat Fab (Selkirk Corporation) Saf-T Vent

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 3H for approved vent adapters. Discard CPVC starter piece.

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.

Approved Stainless Steel Vent Manufacturers

Make Model

S.S. ADAPTER

*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 3H Approved Stainless Steel (S.S.) Terminations and Adapters

ProTech Heat Fab Z Flex

FasNSeal Saf-T Vent Z-Vent

Model

81 - 211

286

S.S.

Adapter

300715

F303759

Flue

Termination

FSBS3

FSRC3(R.C)

FSBS4

FSRC4(R.C.)

Intake Air

Termination

303889 9301PVC

FSAIH04

303888

Adapter

9401PVC

S.S.

Flue

Termination

9392

5300CI

9492

5400CI

Intake Air

Termination

9314TERM 2SVSLA03

9414TERM 2SVSLA04

S.S.

Adapter

Flue

Termination

2SVSTP03

2SVSRCX03

2SVSTP04

2SVSRCX04

Intake Air

Termination

2SVSTEX0390

2SVSTEX0490

Page 22

4 Sidewall direct venting

Installation & Operation Manual

Vent/air termination – sidewall

 WARNING

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 16 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

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.

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.

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

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

FACTORY PROVIDED BIRD SCREEN

If using the sidewall termination:

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

 WARNING

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

When venting out a sidewall using PVC, CPVC, or Polypropylene vent materials, an optional sidewall vent termination kit can be ordered (reference Table 4A for kit numbers).

Table 4A Alternate Sidewall Vent Kits

Model Kit Number Vent Size

81 - 211 KIT30045 3 inch vent

286 KIT30046 4 inch vent

Figure 4-1B Alternate PVC/CPVC/Polypropylene Sidewall Termination of Air and Vent

FROM BOILER

VENT PIPE

CONNECTION

POSSIBLE ORIENTATIONS

TO BOILER INTAKE AIR

CONNECTION

12"

MIN

OVER-

HANG

VENT / AIR

TERMINATION

GRADE OR

SNOW LINE

MIN

12"

Page 23

4 Sidewall direct venting (continued)

Vent/air termination – sidewall

Figure 4-1C Alternate PVC/CPVC/SS/ Polypropylene Venting Arrangement (if Space Allows) w/Field Supplied Fittings

FROM BOILER

VENT PIPE

CONNECTION

TO BOILER INTAKE AIR

CONNECTION

COUPLING

12” MIN

15” MAX

BIRD SCREEN

6. Locate terminations so they are not likely to be damaged by foreign objects, such as stones or balls, or subject to buildup of leaves or sediment.

Figure 4-2A Clearance to Gravity Air Inlets

Installation & Operation Manual

12”

BIRD

SCREEN

GRADE OR

SNOW LINE

ALTERNATE VENTING ARRANGEMENT

(IF SPACE PERMITS)

MIN

Figure 4-1D Alternate SS Venting Arrangement Typical Stainless Steel Sidewall Termination of Air and Vent w/Field Supplied Fittings, Utilizing a Hood Intake

TO BOILER INTAKE AIR

CONNECTION

FROM BOILER

VENT PIPE

CONNECTION

GRADE OR SNOW LINE

BIRD SCREEN

12" (305 MM) MIN

15" (381 MM) MAX

12" (305 MM) MIN

5. Maintain clearances as shown in FIG.’s 4-1A thru 4-3B, pages 22 - 24. Also maintain the following:

a. Vent must terminate:

• At least 6 feet from adjacent walls.

• No closer than 12 inches below roof overhang.

• At least 7 feet above any public walkway.

• At least 3 feet above any forced air intake within 10 feet.

• No closer than 12 inches below or horizontally from any door or window or any other gravity air inlet. b. Air inlet must terminate at least 12 inches above grade or snow line; at least 12 inches below the vent termination; and the vent pipe must not extend more than 24 inches vertically outside the building as shown in FIG. 4-1B. Condensate could freeze and block vent pipe. c. Do not terminate closer than 4 feet horizontally from any electric meter, gas meter, regulator, relief valve, or other equipment. Never terminate above or below any of these within 4 feet horizontally.

12"

MIN.

VENT / AIR

TERMINATION

12"

MIN.

12"

MIN.

Figure 4-2B Alternate Clearance to Gravity Air Inlets w/ Field Supplied Fittings

12”

MIN.

BIRD

SCREEN

(TYPICAL)

12”

MIN.

12”

MIN.

Figure 4-3A Clearance to Forced Air Inlets

IF LESS

THAN 10’

VENT / AIR

TERMINATION

7' MIN. ABOVE ANY PUBLIC WALKWAY

36"

MIN.

FORCED AIR

INLET

Page 24

4 Sidewall direct venting

Installation & Operation Manual

Figure 4-3B Alternate Clearance to Forced Air Inlets w/

Figure 4-4A PVC/CPVC Sidewall Termination Assembly

Field Supplied Fittings

IF LESS THAN 10’

7’ MIN. ABOVE ANY

PUBLIC WALKWAY

36”

MIN.

FORCED AIR

(TYPICAL)

INLET

BIRD

SCREEN

VENT PIPING

WALL PLATE

GALVANIZED

THIMBLE

AIR PIPING

VENT PLATE

VENT CAP

VENT

AIR

CENTERLINE WIDTH

Prepare wall penetrations

1. Use the factory supplied wall plate as a template to locate the vent and air intake holes and mounting holes.

Air pipe penetration:

a. Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

Vent pipe penetration:

a. Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter:

• 4½ inch hole for 3 inch vent pipe

• 5½ inch hole for 4 inch vent pipe Drill 3/16" diameter holes for inserting the plastic anchors

into the wall.

2. For Polypropylene Only: Install the vent and air intake sidewall adapters from Table 3F on page 20 into the vent plate. Slide the sidewall retaining bracket down the sidewall adapters flush to the vent plate (FIG. 4-4B).

3. For PVC/CPVC Only: Install the vent and air intake piping through the wall into the vent plate openings. Use RTV silicone sealant to seal the air pipe. Use the cement/primer listed in Table 3D on page 19 to seal the vent pipe.

4. Mount and secure the vent plate to the wall, using stainless steel screws.

5. Seal all gaps between the pipes and wall. Seal around the plate to the wall assuring no air gaps.

6. Assemble the vent cap to the vent plate (see FIG.'s 4-4A and 4-4B). Insert the stainless steel screws into the vent cap screw hole openings and securely attach the vent cap to the vent plate.

7. Seal all wall cavities.

8. PVC/CPVC terminations are designed to accommodate any wall thickness of standard constructions per the directions found in this manual.

9. Stainless steel terminations are designed to penetrate walls with a thickness up to 9.25 inches of standard construction.

Table 4B Sidewall Vent Centerline Dimensions

Model Air Vent Centerline Width

151 - 200 3" 3" 5 5/8"

286 4" 4" 5 5/8"

Figure 4-4B Polypropylene Sidewall Termination Assembly

SIDEWALL ADAPTER

SIDEWALL

DAPTER

(VENT)

GALVANIZED THIMBLE

(AIR)

WALL PLATE

SIDEWALL RETAINING PLATE

IMG00085

VENT PLATE

VENT CAP

Page 25

4 Sidewall direct venting (continued)

Installation & Operation Manual

Prepare wall penetrations (Alternate Field Supplied Option)

1. Air pipe penetration: a. Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

2. Vent pipe penetration: a. Cut a hole for the vent pipe. For either combustible or noncombustible construction, size the vent pipe hole with at least a 1/2 inch clearance around the vent pipe outer diameter:

• 4½ inch hole for 3 inch vent pipe

• 5½ inch hole for 4 inch vent pipe b. Insert a galvanized metal thimble in the vent pipe hole as shown in FIG. 4-4C.

3. Use a sidewall termination plate as a template for correct

location of hole centers.

4. Follow all local codes for isolation of vent pipe when

passing through floors or walls.

5. Seal exterior openings thoroughly with exterior caulk.

Figure 4-4C Alternate Sidewall Termination Assembly w/Field Supplied Fittings

ELBOW

AIR PIPING

VENT PIPING

Figure 4-5A Multiple Vent Terminations (must also comply with Figure 4-1A)

12" MIN. BETWEEN EDGE OF AIR

INLET AND ADJACENT VENT OUTLET

VENT

AIR

VENT / AIR

TERMINATION

Figure 4-5B Alternate Multiple Vent Terminations w/Field Supplied Fittings (must also comply with Figure 4-1B)

BIRD SCREEN

GALVANIZED THIMBLE

SIDEWALL TERMINATION PLATE

ELBOW

BIRD SCREEN

Multiple vent/air terminations

1. When terminating multiple Knight boilers terminate each vent/air connection as described in this manual (FIG. 4-5A).

 WARNING

2. Place wall penetrations to obtain minimum clearance of 12 inches between edge of air inlet and adjacent vent outlet, as shown in FIG. 4-5A for U.S. installations. For Canadian installations, provide clearances required by CSA B149.1 Installation Code.

3. The air inlet of a Knight boiler is part of a direct vent connection. It is not classified as a forced air intake with regard to spacing from adjacent boiler vents.

All vent pipes and air inlets must terminate at the same height to avoid possibility of severe personal injury, death, or substantial property damage.

Page 26

Installation & Operation Manual

4 Sidewall direct venting

Sidewall termination – optional concentric vent

Description and usage

Lochinvar offers optional concentric combustion air and vent pipe termination kits (Factory Kit #CVK3003 for 3" diameter

- Models 81 - 211 and #CVK3007 for 4" diameter - Model

286). Both combustion air and vent pipes must attach to the termination kit. The termination kits must terminate outside the structure and must be installed as shown below in FIG. 4-6.

The required combustion air and vent pipe materials are listed in Table 3D, on page 19 of this manual.

Figure 4-6 Concentric Sidewall Termination

3. Cut one (1) hole (5 inch diameter for #CVK3003 installations or 7 inch diameter for #CVK3007 installations) into the structure to install the termination kit.

4. Partially assemble the concentric vent termination kit. Clean and cement using the procedures found in these instructions.

a. Cement the Y concentric fitting to the larger kit pipe (FIG.’s 4-7 and 4-8). b. Cement the rain cap to the smaller diameter kit pipe (FIG.’s 4-7 and 4-8).

Figure 4-7 Kit Contents_CVK3003

RAIN CAP

Sidewall termination installation

1. Determine the best location for the termination kit (see FIG. 4-6).

2. Reference the Determine Location Section on page 22 of this manual for general termination considerations.

4" DIA.

SDR-26 PIPE

"Y" CONCENTRIC FITTING

Figure 4-8 Kit Contents_CVK3007

6" (152 MM) TO 4" (102 MM) REDUCER

6" (152 MM) DIA.

"Y" CONCENTRIC FITTING

6" (152 MM) DIA.

2 1/2" DIA. SDR-26 PIPE

RAIN CAP

6" (152 MM) DIA.

4" (102 MM) DIA.

"FLEXIBLE" PIPE COUPLING

Page 27

Installation & Operation Manual

4 Sidewall direct venting (continued)

Sidewall termination – optional concentric vent

Figure 4-9 Concentric Vent Dimensional Drawing Models 81 - 211

NOTICE

Instead of cementing the smaller pipe to the rain cap, a field-supplied stainless steel screw may be used to secure the two (2) components together when field disassembly is desired for cleaning (see FIG. 4-11).

 WARNING

When using the alternate screw assembly method, drill a clearance hole in the rain cap and a pilot hole in the vent pipe for the screw size being used. Failure to drill adequate holes may cause cracking of PVC components, allowing combustion products to be recirculated. Failure to follow this warning could result in personal injury or death.

 WARNING

Do not operate the appliance with the rain cap removed or recirculation of combustion products may occur. Water may also collect inside the larger combustion air pipe and flow to the burner enclosure. Failure to follow this warning could result in product damage or improper operation, personal injury, or death.

Figure 4-11 Rain Cap to Vent Pipe Alternate Assembly

Figure 4-10 Concentric Vent Dimensional Drawing -

Model 286

"A"

"B" DIA.

"G"

(76 MM)

"H" DIA.

"D"

"E"

"F"

"B" DIA. PVC VENT / EXHAUST

"C" DIA.

5. Install the Y concentric fitting and pipe assembly through the structure’s hole from an inside wall.

NOTICE

Do not allow insulation or other materials to accumulate inside the pipe assembly when installing through the hole.

6. Install the rain cap and small diameter pipe assembly into the Y concentric fitting and large pipe assembly from an outside wall. Ensure small diameter pipe is bottomed and cemented in the Y concentric fitting for #CVK3003 installations and fastened tightly into the rubber adapter for #CVK3007 installations.

7. Secure the assembly to the structure as shown in FIG. 4-12 using field-supplied metal strapping or equivalent support material.

NOTICE

Ensure termination location clearance dimensions are as shown in FIG. 4-6.

If assembly needs to be extended to allow sidewall thickness requirement, the two (2) pipes supplied in the kit may be replaced by using the same diameter, field-supplied SDR-26 PVC (D2241) pipe for CVK3003 and standard schedule 40 PVC for CVK3007. Do not extend dimension D* more than 60 inches (see FIG.’s 4-9 and 4-10).

NOTICE

If assembly depth needs to be reduced, dimension D can be as short as possible.

Page 28

Installation & Operation Manual

4 Sidewall direct venting

Sidewall termination – optional concentric vent

Figure 4-12 Concentric Vent Sidewall Attachment

Note: CVK3003 shown for illustration purposes.

CAUTION

8. Cement appliance combustion air and vent pipes to the concentric vent termination assembly. See FIG. 4-12 for proper pipe attachment.

9. Operate the appliance one (1) heat cycle to ensure combustion air and vent pipes are properly connected to the concentric vent termination connections.

DO NOT use field-supplied couplings to extend pipes. Airflow restriction will occur and may cause intermittent operation.

Multiventing sidewall terminations

When two (2) or more direct vent appliances are vented near each other, each appliance must be individually vented (see FIG. 4-13). NEVER common vent or breach vent this appliance. When two (2) or more direct vent appliances are vented near each other, two (2) vent terminations may be installed as shown in FIG. 4-13. It is important that vent terminations be made as shown to avoid recirculation of flue gases.

12" MINIMUM

VENT

COMBUSTION AIR

Figure 4-13 Concentric Vent and Combustion Air Termination

Page 29

5 Vertical direct venting

Installation & Operation Manual

Vent/air termination – vertical

 WARNING

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 16 of this manual.

2. Prepare the vent termination and the air termination elbow (FIG. 5-1A) by inserting bird screens. Bird screens should be obtained locally.

3. The vent must terminate at least 3 feet above the highest place in which the vent penetrates the roof and at least 2 feet above any part of a building within 10 horizontal feet.

4. The air piping must terminate in a down-turned 180° return pipe no further than 2 feet from the center of the vent pipe. This placement avoids recirculation of flue products into the combustion air stream.

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

Figure 5-1A PVC/CPVC/Polypropylene Vertical Termination of Air and Vent

ALTERNATE INTAKE LOCATIONS: INTAKE PIPES MAY BE LOCATED ANYWHERE WITHIN 24” OF VENT PIPE

BIRD SCREEN (TYPICAL)

VENT

COUPLING (FIELD SUPPLIED)

VENT OUTLET 12” MINIMUM ABOVE AIR INLET

COMBUSTION

AIR

6” MINIMUM ABOVE ROOF / SNOW LINE

Figure 5-1B Stainless Steel Vertical Termination of Air and Vent

ALTERNATE INTAKE LOCATIONS: INTAKE PIPES MAY BE LOCATED ANYWHERE WITHIN 24” (610 MM) OF VENT PIPE

VENT

BIRD SCREEN

(TYPICAL)

5. The vent piping must terminate in an up-turned coupling as shown in FIG. 5-1A. The top of the coupling must be at least 1 foot above the air intake. When the vent termination uses a rain cap as illustrated in FIG. 5-1B maintain at least 36" (914 mm) above the air inlet. The air inlet pipe and vent pipe can be located in any desired position on the roof, but must always be no further than 2 feet (.6 m) apart and with the vent termination at least 1 foot for PVC and 3 feet for stainless steel, above the air intake.

6. Maintain the required dimensions of the finished termination piping as shown in FIG. 5-1A.

7. Do not extend exposed vent pipe outside of building more than shown in this document. Condensate could freeze and block vent pipe.

 WARNING

Rooftop vent and air inlet terminations must terminate in the same pressure zone, unless vertical vent sidewall air is set up as shown in the General Venting Vertical Vent, Sidewall Air Section.

6" (152 MM) MINIMUM

ABOVE ROOF /

SNOW LINE

COM,BUSTION

VENT OUTLET

36” (914 MM) MINIMUM

ABOVE AIR INLET

AIR

8. Locate terminations so they are not likely to be damaged by foreign objects, such as stones or balls, or subject to buildup of leaves or sediment.

Page 30

5 Vertical direct venting

Vent/air termination – vertical

Installation & Operation Manual

Prepare roof penetrations

1. Air pipe penetration: a. Cut a hole for the air pipe. Size the air pipe hole as close as desired to the air pipe outside diameter.

• 4½ inch hole for 3 inch vent pipe

• 5½ inch hole for 4 inch vent pipe b. Insert a galvanized metal thimble in the vent pipe hole.

3. Space the air and vent holes to provide the minimum spacing shown in FIG. 5-1A, page 29.

4. Follow all local codes for isolation of vent pipe when passing through floors, ceilings, and roofs.

5. Provide flashing and sealing boots sized for the vent pipe and air pipe.

Figure 5-2 Vertical Terminations with Multiple Boilers

Figure 5-3 Alternate Vertical Terminations with Multiple

Boilers

Multiple vent/air terminations

1. When terminating multiple Knight boilers, terminate each vent/air connection as described in this manual (FIG. 5-2).

 WARNING

2. Place roof penetrations to obtain minimum clearance of 12 inches between edge of air intake elbow and adjacent vent pipe of another boiler for U.S. installations (see FIG. 5-2). For Canadian installations, provide clearances required by CSA B149.1 Installation Code.

3. The air inlet of a Knight boiler is part of a direct vent connection. It is not classified as a forced air intake with regard to spacing from adjacent boiler vents.

Terminate all vent pipes at the same height and all air pipes at the same height to avoid possibility of severe personal injury, death, or substantial property damage.

Page 31

Installation & Operation Manual

5 Vertical direct venting (continued)

Vertical termination – optional concentric vent

Description and usage

Lochinvar offers an optional concentric combustion air and vent pipe termination kit. Both combustion air and vent pipes must attach to the termination kit. The termination kit must terminate outside the structure and must be installed as shown in FIG. 5-4.

Field supplied pipe and fittings are required to complete the installation.

The required combustion vent pipe and fittings are listed in Table 3D, on page 19 of this manual.

Vertical termination installation

1. See Section 5, Vertical Direct Venting - Determine Location (where applicable) (FIG. 5-1A).

Figure 5-4 Concentric Vertical Termination

2. Cut one (1) hole (5 inch diameter for #CVK3003 installations or 7 inch diameter for #CVK3007 installations) into the structure to install the termination kit.

3. Partially assemble the concentric vent termination kit. Clean and cement following the cleaning procedures in these instructions.

a. Cement the Y concentric fitting to the larger

diameter kit pipe (see FIG.’s 4-7 and 4-8, page 26).

b. Cement rain cap to the smaller diameter kit pipe (see

FIG.’s 4-7 and 4-8, page 26).

NOTICE

 WARNING

Instead of cementing the smaller pipe to the rain cap, a field supplied stainless steel screw may be used to secure the two (2) components together when field disassembly is desired for cleaning (see FIG. 4-11, page 27).

Figure 5-5 Do Not Install U-Bend to Rain Cap

Page 32

Installation & Operation Manual

5 Vertical direct venting

Vertical termination – optional concentric vent

 WARNING

4. Install the Y concentric fitting pipe assembly up through the structure’s hole and field supplied roof boot/flashing.

NOTICE

Do not allow insulation or other materials to accumulate inside the pipe assembly when installing through the hole.

5. Secure the assembly to the roof structure as shown below in FIG. 5-6 using field supplied metal strapping or equivalent support material.

Figure 5-6 Concentric Vent Roof Installation

Note: CVK3003 shown for illustration purposes.

CAUTION

DO NOT use field-supplied couplings to extend pipes. Airflow restriction will occur.

6. Install the rain cap and the small diameter pipe assembly into the roof penetration assembly. Ensure the small diameter pipe is cemented and bottomed in the Y concentric fitting for #CVK3003 installations and fastened tightly into the rubber adapter for #CVK3007 installations.

7. Cement the appliance combustion air and vent pipes to the concentric vent termination assembly. See FIG. 5-6 for proper pipe attachment.

8. Operate the appliance through one (1) heat cycle to ensure combustion air and vent pipes are properly connected to the concentric vent termination connections.

Multiventing vertical terminations

When two (2) or more direct vent appliances are vented near each other, each appliance must be individually vented (see FIG. 5-7). NEVER common vent or breach vent this appliance. When two (2) or more direct vent appliances are vented near each other, two (2) vent terminations may be installed as shown in FIG. 5-7. It is important that vent terminations be made as shown to avoid recirculation of flue gases.

NOTICE

Ensure termination height is above the roof surface or anticipated snow level (12 inches in U.S.A. or 18 inches in Canada) as shown in FIG. 5-4, page 31.

If assembly is too short to meet height requirement, the two (2) pipes supplied in the kit may be replaced by using the same diameter, field supplied SDR26 PVC (D2241) pipe for CVK3003 and standard schedule 40 PVC for CVK3007. Do not extend dimension D* more than 60 inches (see FIG.’s 4-9 and 4-10, page 27).

Figure 5-7 Concentric Vent and Combustion Air Vertical Termination

12”

MINIMUM

COMBUSTION AIR (TYPICAL)

12” (18” FOR CANADA) MINIMUM CLEARANCE

ABOVE HIGHEST

ANTICIPATED SNOW

LEVEL. MAXIMUM OF

24” ABOVE ROOF.

Page 33

5 Vertical direct venting (continued)

Alternate vertical concentric venting

Installation & Operation Manual

This appliance may be installed with a concentric vent arrangement where the vent pipe is routed through an existing unused venting system; or by using the existing unused venting system as a chase for vent and combustion air routing.

Concentric Venting Arrangement

The venting is to be vertical through the roof. The annular space between the O.D. of the vent pipe and the I.D. of the existing unused venting system is utilized for the combustion air source.

The minimum size of the existing vent system required to achieve enough annular space for combustion air can be found in Table 5A below.

The upper and lower termination as well as any other unsealed joints in the existing vent system must be sealed to ensure that all combustion air is drawn from under the vent cap as shown in FIG.’s 5-8 and 5-9.

Approved venting materials must be used as specified in Table 3D on page 19.

Follow all vent / air termination and clearance requirements per this section to the appropriate example. Installation must comply with local requirements and with the National Fuel Gas Code.

The maximum allowable equivalent vent and air intake lengths for this venting arrangement are to be determined from the General Venting Section.

Figure 5-8 Concentric Vent Example 1

FLUE EXHAUST

SEAL

COMBUSTION AIR

IR INLET

W/ SCREEN

12"

MIN.

SEAL

FLUE OUTLET

*For concept illustration only. Individual installations

may vary due to job site specific equipment.

Figure 5-9 Concentric Vent Example 2

SEAL

FLUE EXHAUST

EXISTING

SEALED CAP

If an existing unused venting system is converted for use with this method of concentric venting, the installer must ensure that the existing venting system is clean and free from particulate contamination that will harm this appliance and

IR INLET

W/ SCREEN

COMBUSTION AIR

cause increased nuisance calls or maintenance. See Table 1A on page 11 for a list of corrosive contaminants and sources.

Two example scenarios of a concentric venting arrangement are shown for illustrative purposes in FIG.’s 5-8 and 5-9.

Table 5A Alternate Vertical Concentric Vent / Chase Sizes

Model

Vent / Air

Inlet Size

Minimum Existing

Vent / Chase Size

SEAL

EXISTING

SEALED CAP

81 - 211 3" 5"

286 4" 7"

FLUE OUTLET

*For concept illustration only. Individual installations

may vary due to job site specific equipment.

Page 34

5 Vertical direct venting

Existing vent as a chase

Follow all existing termination and clearance requirements and allowable pipe lengths. Use only approved venting materials listed in the General Venting Section of this manual.

Figure 5-10 Existing Vent as a Chase

Installation & Operation Manual

AIR INLET

CAP

*For concept illustration only. Individual installations

may vary due to job site specific equipment.

FLUE EXHAUST

SEAL

EXISTING

SEAL

FLUE OUTLET

Page 35

6 Hydronic piping

Installation & Operation Manual

System water piping methods

The Knight is designed to function in a closed loop pressurized system not less than 12 psi. A temperature and pressure gauge is included to monitor system pressure and outlet temperature and should be located on the boiler outlet.

It is important to note that the boiler has a minimal amount of pressure drop and must be figured in when sizing the circulators. Each boiler installation must have an air elimination device, which will remove air from the system. Install the boiler so the gas ignition system components are protected from water (dripping, spraying, etc.) during appliance operation for basic service of circulator replacement, valves, and others.

Observe a minimum of 1/4 inch (6 mm) clearance around all un-insulated hot water pipes when openings around the pipes are not protected by non-combustible materials.

Low water cutoff device

On a boiler installed above radiation level, some states and local codes require a low water cutoff device at the time of installation.

Chilled water system

If the boiler supplies hot water to heating coils in air handler units, flow control valves or other devices must be installed to prevent gravity circulation of heater water in the coils during the cooling cycle. A chilled water medium must be piped in parallel with the heater.

Freeze protection

Freeze protection for new or existing systems must use glycol that is specially formulated for this purpose. This includes inhibitors, which prevent the glycol from attacking the metallic system components. Make certain to check that the system fluid is correct for the glycol concentration and inhibitor level. The system should be tested at least once a year and as recommended by the producer of the glycol solution. Allowance should be made for the expansion of the glycol solution in the system piping.

 WARNING

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.

General piping information

3. Install purge and balance valve or shutoff valve and drain on system return to purge air out of each zone.

4. Install a backflow preventer on the cold feed make-up water line.

5. Install a pressure reducing valve on the cold feed makeup water line, (15 psi nominal). Check temperature and pressure gauge (shipped separately), which should read a minimum pressure of 12 psi.

6. Install a circulator as shown on the piping diagrams in this section. Make sure the circulator is properly sized for the system and friction loss.

7. Install an expansion tank on the system supply. Consult the tank manufacturer’s instruction for specific information relating to tank installation. Size the expansion tank for the required system volume and capacity.

8. Install an air elimination device on the system supply.

9. Install a drain valve at the lowest point of the system. Note: The boiler cannot be drained completely of water without purging the unit with an air pressure of 15 psi.

10. This appliance is supplied with a relief valve sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV (“Heating Boilers”). Pipe the discharge of the safety relief valve to prevent injury in the event of pressure relief. Pipe the discharge to a drain. Provide piping that is the same size as the safety relief valve outlet. Never block the outlet of the safety relief valve.

 WARNING

*See the piping illustrations included in this section, FIG.’s 6-4 thru 6-10 for suggested guidelines in piping the Knight boiler with either zone valves or circulator pumps.

NOTICE

CAUTION

The relief valve, tee and any necessary fittings are shipped in the install kit with the boiler and are to be field installed (FIG. 6-1).

*Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

The Knight boiler is capable of servicing multiple temperature loop systems. It is the responsibility of the installer to protect the loops with lower temperature requirements from higher temperatures that may be required by other loops.

Basic steps are listed in this section along with illustrations on the following pages (FIG.’s 6-4 thru 6-10), which will guide you through the installation of the Knight boiler (reference FIG.’s 6-2A and 6-2B).

1. Connect the system return marked “Inlet”.

2. Connect the system supply marked “Outlet”.

Page 36

6 Hydronic piping

Installation & Operation Manual

Relief valve and temperature and pressure gauge installation

Basic steps are listed below to guide you through the installation of the relief valve and the temperature and pressure (T & P) gauge provided with the unit.

1. Install the tee with the 3/4 inch fitting positioned vertically and on the top as shown in FIG. 6-1.

2. Install the relief valve into the 3/4 inch fitting of the tee installed in Step 1 (FIG. 6-1).

3. Install a field provided close nipple and tee with the fitting positioned vertically on the top on the downstream side of the relief valve (see FIG. 6-1).

4. Install the temperature and pressure gauge provided with the unit into the top fitting of the tee (a bushing may be necessary) installed in Step 3 (FIG. 6-1).

Figure 6-1 Relief Valve / T & P Installation

Knight boilers are capable of controlling a variable

speed boiler circulator. Variable speed circulators MUST be sized to meet the specified minimum flow requirements listed in FIG. 6-3 on page 38 at full

speed.

3. Domestic hot water circulating pump:

Field supplied. The pump MUST be sized to meet the specified minimum flow requirements listed in FIG. 6-3. Consult the indirect water heater operating guide to determine flow characteristics for the selected product used.

4. Boiler isolation valves:

Field supplied. Full port ball valves are required. Failure to use full port ball valves could result in a restricted flow rate through the boiler.

5. Check valves:

Field supplied. Check valves are recommended for installation as shown in FIG.’s 6-4 thru 6-10. Failure to install check valves could result in a reverse flow condition during pump(s) off cycle.

6. Domestic indirect hot water isolation valves:

Field supplied. Full port ball valves are required. Failure to use full port ball valves could result in a restricted flow rate through the boiler.

RELIEF VALVE

TEMPERATURE & PRESSURE GAUGE

TEE W/FITTING ON TOP

(FIELD PROVIDED)

CLOSE NIPPLE

(FIELD PROVIDED)

TEE WITH 3/4” FITTING ON TOP

CLOSE NIPPLE

Near boiler piping components

1. Boiler system piping:

Boiler system piping MUST be sized per the pipe requirements listed in Table 6A. Reducing the pipe size can restrict the flow rate through the boiler, causing inadvertent high limit shutdowns and poor system performance. Flow rates are based on 20 feet of piping, 4 - 90° elbows, and 2 - fully ported ball valves.

2. Boiler system pump:

A Grundfos UPS26-99F pump will be provided by the factory (for standard altitude models) as the boiler circulation pump based on 20 feet of piping, 4 - 90° elbows, and 2 - fully ported ball valves.

7. Anti-scald mixing valve:

Field supplied. An anti-scald mixing valve is recommended when storing domestic hot water above 115°F.

8. Unions:

Field supplied. Recommended for unit serviceability.

9. Temperature and pressure gauge:

Factory supplied. The temperature and pressure gauge is shipped loose. It is the responsibility of the contractor to install the temperature and pressure gauge on the boiler water outlet.

10. Pressure relief valve:

Factory supplied. The pressure relief valve is sized to ASME specifications.

11. Boiler purge valve:

Field supplied. The boiler purge valve is used to remove entrapped air from the heat exchanger during start-up.

12. System temperature sensor:

Lochinvar supplies a system temperature sensor. The sensor is to be installed in the heating loop downstream from the boiler hot water piping and heating loop junction. Typically the sensor will be located far enough downstream to sense system diluted water temperature.

Page 37

6 Hydronic piping (continued)

Installation & Operation Manual

13. Indirect water heaters:

The Knight boiler may be piped to an indirect water heater to heat domestic hot water with the space heat transfer medium. As depicted on pages 40 through 46 there are two options when utilizing an indirect water heater.

A. The space heating piping will branch off to flow the space heat transfer medium through a single wall heat exchanger coil inside the indirect water heater.

B. The indirect water heater is connected to the system supply piping. A pump controlled by the Knight boiler’s control will regulate the flow of water through the indirect water heater. The indirect water heater’s temperature will be regulated by the Knight boiler’s control.

The Knight boiler is pre-configured to control the operation of the DHW pump with Domestic Hot Water Prioritization programming. The DHW programming is designed to control and balance the space heating demand by switching between DHW and space heating.

Lochinvar offers the Squire which is a series of indirect water heaters. The Squire features a stainless steel vessel with a single wall stainless steel heat exchanger.

Near boiler piping connections

CAUTION

It is up to the installer to ensure the minimum system flow is not less than the minimum boiler flow at any time.

 WARNING

The National Standard Plumbing Code, the National Plumbing Code of Canada and the Uniform Plumbing Code limit the pressure of the heat transfer fluid to less than the minimum working pressure of the potable water system up to 30 psi maximum. Also, the heat transfer fluid must be water or other non-toxic fluid having a toxicity of Class 1, as listed in Clinical Toxicology of

Commercial Products, 5

Edition.

14. Y-Strainer:

Field supplied. A Y-strainer or equivalent multipurpose strainer is recommended at the inlet of the heat exchanger to remove system particles from older hydronic systems and protect newer systems.

Circulator sizing

The Knight boiler heat exchanger does have a pressure drop, which must be considered in your system design. Refer to the graph in FIG. 6-3 for pressure drop through the Knight boiler heat exchanger.

Figure 6-2A Near Boiler Piping w/Y-Strainer

Y-S T R AI N ER

(RECOMMENDED)

TO FLOOR

DRAIN

DOMESTIC HOT WATER PUMP

AIR SEPARATOR

SYSTEM

PUMP

SYSTEM SENSOR

BOILER

PUMP

DRAIN

(TYPICAL)

INDIRECT

DOMESTIC

HOT WATER

TAN K

Figure 6-2B Near Boiler Piping w/Low Loss Header

AIR VENT VALVE

LOW LOSS HEADER (TYPICAL)

Y-S T R AI N ER

(RECOMMENDED)

BOLIER PUMP

SYSTEM SENSOR

AIR SEPARATOR

DRAIN (TYPICAL)

DRAIN VALVE

FILL VALVE

INDIRECT

DOMESTIC

HOT WATER

EXPANSION TANK

TO FLOOR DRAIN

Page 38

Installation & Operation Manual

3 4 5 6 7 8 9 10111213141516171819202122232425

106

151

211

286

6 Hydronic piping

Figure 6-3 Pressure Drop vs. Flow

Pressure Drop vs. Flow (Includes Secondary Piping)

Pressure Drop (Feet of Head)

Flow Rate (GPM)

Table 6A Circulator Recommendations for Temperature Rise Applications_20°, 25°, and 35°

20°F Temperature Rise Applications

Model GPM FT/HD

81 7.5 24 1" UPS26-99F 0011 NRF-36 E7 106 9.8 27 1" UPS26-99F* 0013 NRF-36 E11 151 14.0 20 1" UPS26-99F 0011 NRF-36 E7 211 19.6 29 1" UPS32-160 1400-50 PL-55 E9* 286 26.5 15 1-1/4" UPS32-80 1400-20 PL-36 E11

*NOTICE

These pumps are only slightly above 20° rise flows, but are the closest available. To reach a 20° rise or less, an upsized pump will be required.

Minimum Pipe

Size

25°F Temperature Rise Applications

Model GPM FT/HD

81 5.9 15.0 1" UPS15-58FC 0014 NRF-36 E7 106 7.7 17.5 1" UPS26-99F 0014 NRF-36 E7 151 11.0 12.8 1" UPS26-99F 0014 NRF-36 E7 211 15.5 19.0 1" UPS26-99F 0013 NRF-36 E7 286 21.0 11.5 1-1/4" UPS26-99F 0011 NRF-36 E7

Minimum Pipe

Size

35°F Temperature Rise Applications

Model GPM FT/HD

81 4.2 7.3 1" UPS15-58FC 007 NRF-22 Astro-30 106 5.5 9.3 1" UPS15-58FC 007 NRF-22 Astro-30 151 7.9 9.5 1" UPS15-58FC 008/0010 NRF-36 Astro-30 211 11.0 9.1 1" UPS15-58FC 0010 NRF-36 Astro-50 286 15.0 7.3 1-1/4" UP26-64F 008/0010 NRF-36 E7

NOTICE

Pumps listed in bold type are provided by the factory as the boiler circulation pump on standard altitude models.

Pumps listed in italicized type are provided by the factory as the boiler circulation pump on high altitude models.

The temperature rise provided by a pump/model combination will decrease by 3% per 1000 feet of elevation.

Minimum Pipe

Size

Pump

Grundfos TACO B & G Armstrong

Pump

Grundfos TACO B & G Armstrong

Pump

Grundfos TACO B & G Armstrong

Page 39

Installation & Operation Manual

6 Hydronic piping (continued)

Variable speed pump option

Table 6B Recommended Variable Speed Pumps

Minimum Temperature Rise*

Pump

Model

81 20.3 20.3 21.7 106 22.3 21.0 21.5 151 21.2 19.8 19.1 211 26.8 25.1 23.6 286 26.7 24.3 21.9

*The minimum temperature rise is derived from the chart in FIG. 6-3 with the firing rate and pump speed at 100% as shown in the table above.

The shaded regions of pump coverage are only available for applications with 230V (60 Hz) supply voltage, all others are

to be 115V. (A field supplied relay is required to connect the 230V pump listed in the shaded area in Table 6B to the boiler high voltage terminal strip.)

Grundfos

UP26-96 FC/VS

TACO

0013 IFC VS

Wilo

Stratos 1.25 3 x 30

Variable speed pump setup

Before operation, ensure the following:

- Pump is set for an input signal of 0 - 10Vdc by the dip switches on the pump control

- Pump is set for external signal control (if applicable)

- Pump is set for linear output (if applicable)

- If pump does not come equipped with a 0 - 10 Vdc input option, an optional module will be required from the vendor

NOTICE

Pump sizing and flow requirements are based on 20 feet of piping, 4 - 90° elbows, and 2 - fully ported ball valves.

It is required that near boiler piping systems utilize the Primary/Secondary configuration shown in FIG. 6-10 only. The use of other near boiler piping configurations could result in improper building and system flow rates leading to inadvertent boiler high limit shutdowns and poor system performance.

SMART SYSTEM / Multi-temperature loop control option

The Knight boiler is capable of producing up to three (3) set point temperatures to meet different space heating demands. When using more than one temperature demand it is necessary to protect the lower temperature loop from overheating. To help aid with this protection, Lochinvar offers the MultiTemperature Loop Control Board Kit (RLY30086).

Page 40

6 Hydronic piping

Figure 6-4 Single Boiler - Single Temperature Zoned with Circulators

ZONE #1

Installation & Operation Manual

PRESSURE

REDUCING VALVE

BACKFLOW

PREVENTER

MAKE UP WATER

AIR SEPARATOR

BALL VALVE

(TYPICAL)

DRAIN POINT

(TYPICAL)

PRESSURE

GAUGE

SYSTEM SUPPLY

SENSOR

(WHEN USED)

ZONE #2 ZONE #3

EXPANSION

TANK

MAY SUBSTITUTE LOW LOSS HEADER

Y-STRAINER (RECOMMENDED)

BOILER CIRCULATOR

DOMESTIC

HOT WATER

CIRCULATOR

ZONE #4

ANTI-SCALD

MIXING VALVE

FLOW CHECK

VALVE

(TYPICAL)

ZONE CIRCULATORS

(TYPICAL)

HOT

WATER

OUT

COLD

WATER

NOTICE

UNION

(TYPICAL)

TEMPERATURE /

PRESSURE

GAUGE

DRAIN

BOILER

INDIRECT

DHW TANK

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Page 41

Installation & Operation Manual

6 Hydronic piping (continued)

Figure 6-5 Multiple Boilers - Single Temperature Zoned with Circulators

REDUCING VALVE

BACKFLOW

PREVENTER

MAKE UP WATER

AIR SEPARATOR

MAY SUBSTITUTE

LOW LOSS HEADER

PRESSURE

GAUGE

SYSTEM SUPPLY

SENSOR

ZONE #1

EXPANSION

TANK

Model

81 1-1/4" 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 106 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 3" 151 2" 2" 2-1/2" 2-1/2" 3" 3" 3-1/2" 211 2" 2-1/2" 3" 3" 3-1/2" 4" 4" 286 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 5"

ZONE #2 ZONE #3

2345678

Number of Units

Required Pipe Sizes

ZONE #4

FLOW CHECK

VALVE

(TYPICAL)

ZONE CIRCULATORS

(TYPICAL)

BALL VALVE

(TYPICAL)

DRAIN POINT

(TYPICAL)

TEMPERATURE /

PRESSURE

GAUGE

Y-STRAINER (RECOMMENDED) (TYPICAL)

BOILER 2

(MEMBER 1)

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART

ANTI-SCALD

MIXING VALVE

DOMESTIC

HOT WATER

CIRCULATOR

UNION

(TYPICAL)

BOILER CIRCULATOR

DRAIN

BOILER 1

(LEADER)

DHW TANK

HOT

WATER

OUT

COLD

WATE

INDIRECT

NOTICE

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Page 42

6 Hydronic piping

Figure 6-6 Single Boiler - Multiple Temperatures

Installation & Operation Manual

PRESSURE REDUCING VALVE

BACKFLOW

PREVENTER

MAKE

WATER

AIR SEPARATOR

BALL VALVE

(TYPICAL)

DRAIN POINT

(TYPICAL)

PRESSURE

GAUGE

SYSTEM

SUPPLY SENSOR

EXPANSION

TANK

MAY SUBSTITUTE LOW LOSS HEADER

TEMPERATURE

LOOP #1

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART

Y-STRAINER (RECOMMENDED)

BOILER CIRCULATOR

FLOW CHECK VALVE

TEMPERATURE

LOOP #2

120VAC TO PUMPS

MIXING VALVES

DOMESTIC

HOT WATER

CIRCULATOR

TEMPERATURE

24V SIGNALTO

LOOP #3

HOT WATER

OUT

WIRES TO LOOP SENSORS

MIXING VALVES

(TYPICAL)

MULTI-TEMP LOOP CONTROL

ANTI-SCALD MIXING VALVE

COLD WATER IN

CAUTION

NOTICE

SHIELDED CABLE TO

BOILER CONTROL

UNION

(TYPICAL)

TEMPERATURE /

PRESSURE

GAUGE

DRAIN

BOILER

INDIRECT

DHW TANK

Mixing valves are required for the protection of low temperature loops.

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Page 43

6 Hydronic piping (continued)

Installation & Operation Manual

Figure 6-7 Multiple Boilers - Multiple Temperatures

MAKE

WATER

BACKFLOW

PREVENTER

AIR SEPARATOR

BALL VALVE

(TYPICAL)

DRAIN POINT

(TYPICAL)

PRESSURE REDUCING VALVE

PRESSURE

GAUGE

Y-STRAINER (RECOMMENDED)

SYSTEM

SUPPLY SENSOR

EXPANSION

TANK

MAY SUBSTITUTE LOW LOSS HEADER

TEMPERATURE

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART

LOOP #1

BOILER CIRCULATOR

FLOW CHECK

Number of Units

Model

2345678

Required Pipe Sizes

81 1-1/4" 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 106 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 3" 151 2" 2" 2-1/2" 2-1/2" 3" 3" 3-1/2" 211 2" 2-1/2" 3" 3" 3-1/2" 4" 4" 286 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 5"

TEMPERATURE

120VAC TO PUMPS

DOMESTIC

HOT WATER

CIRCULATOR

VALVE

LOOP #2

24V SIGNAL TO

MIXING VALVES

TEMPERATURE

LOOP #3

HOT WATER

OUT

MIXING VALVES (TYPICAL)

WIRES TO LOOP SENSORS

ANTI-SCALD MIXING VALVE

COLD WATER IN

CAUTION

NOTICE

SHIELDED CABLE TO

BOILER CONTROL

TEMPERATURE /

PRESSURE

GAUGE

BOILER

UNION

(TYPICAL)

DRAIN

BOILER

INDIRECT

DHW TANK

IMG00193

Mixing valves are required for the protection of low temperature loops.

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Page 44

Installation & Operation Manual

6 Hydronic piping

Figure 6-8 Single Boiler - Multiple Temperatures with DHW Piped as a Zone

PRESSURE REDUCING VALVE

BACKFLOW

PREVENTER

MAKE

WATER

AIR SEPARATOR

BALL VALVE

(TYPICAL)

(RECOMMENDED)

DRAIN POINT

(TYPICAL)

Y-STRAINER

BOILER

CIRCULATOR

SYSTEM

SUPPLY

SENSOR

PRESSURE

GAUGE

EXPANSION

TANK

MAY SUBSTITUTE LOW LOSS HEADER

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART

TEMPERATURE

LOOP #1

120VAC TO PUMPS

24V SIGNAL TO

MIXING VALVES

MULTI-TEMP

LOOP CONTROL

SHIELDED CABLE TO

BOILER CONTROL

TEMPERATURE

LOOP #2

TEMPERATURE

LOOP #3

MIXING VALVES

(TYPICAL)

WIRES TO LOOP SENSORS

DOMESTIC HOT WATER CIRCULATOR

FLOW CHECK VALVE

HOT

WATER

OUT

ANTI-SCALD MIXING VALVE

COLD WATER IN

CAUTION

NOTICE

UNION

(TYPICAL)

TEMPERATURE /

PRESSURE

GAUGE

Mixing valves are required for the protection of low temperature loops.

DRAIN

BOILER

INDIRECT

DHW TANK

IMG00194

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Please note that the installer is responsible for ensuring DHW prioritization when piped as a zone.

Page 45

6 Hydronic piping (continued)

Figure 6-9 Multiple Boilers - Single Temperature Zoned with Valves

Model

81 1-1/4" 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 106 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 3" 151 2" 2" 2-1/2" 2-1/2" 3" 3" 3-1/2" 211 2" 2-1/2" 3" 3" 3-1/2" 4" 4" 286 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 5"

ZONE #2 ZONE #3 ZONE #4

BACKFLOW

PREVENTER

BALL VALVE

(TYPICAL)

PRESSURE

REDUCING VALVE

PRESSURE

GAUGE

ZONE #1

Installation & Operation Manual

Number of Units

2345678

Required Pipe Sizes

ZONE VALVES

(TYPICAL)

MAKE UP WATER

AIR SEPARATOR

SYSTEM SUPPLY

(WHEN USED)

DRAIN POINT

(TYPICAL)

SENSOR

SYSTEM

CIRCULATOR

Y-STRAINER (RECOMMENDED) (TYPICAL)

EXPANSION

TANK

DIFFERENTIAL PRESSURE BYPASS VALVE (IF USED)

MAY SUBSTITUTE LOW LOSS HEADER

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART

ANTI-SCALD

BOILER CIRCULATOR

FLOW CHECK VALVE

MIXING VALVE

DOMESTIC

HOT WATER

CIRCULATOR

HOT

WATER

OUT

COLD

WATER

TEMPERATURE /

NOTICE

UNION

PRESSURE

GAUGE

BOILER 2

(MEMBER 1)

(TYPICAL)

DRAIN

BOILER 1

(LEADER)

INDIRECT

DHW TANK

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Page 46

6 Hydronic piping

Figure 6-10 Multiple Boilers - Non-Zoned Primary/Secondary Piping

Model

81 1-1/4" 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 106 1-1/2" 2" 2" 2-1/2" 2-1/2" 2-1/2" 3" 151 2" 2" 2-1/2" 2-1/2" 3" 3" 3-1/2" 211 2" 2-1/2" 3" 3" 3-1/2" 4" 4" 286 2-1/2" 2-1/2" 3" 3-1/2" 3-1/2" 4" 5"

PRESSURE

REDUCING VALVE

BACKFLOW

PREVENTER

MAKE UP WATER

CIRCULATOR

SYSTEM

BALL VALVE

(TYPICAL)

SYSTEM

EXPANSION

TANK

PRESSURE

GAUGE

SYSTEM SUPPLY SENSOR

AIR SEPARATOR

Installation & Operation Manual

Number of Units

2345678

Required Pipe Sizes

MAY SUBSTITUTE LOW LOSS HEADER

FROM

NOT TO EXCEED 4 PIPE DIA OR MAX. OF 12" APART

DRAIN POINT

(TYPICAL)

Y-STRAINER

(RECOMMENDED)

(TYPICAL)

SYSTEM

TEMPERATURE /

PRESSURE

GAUGE

NOTICE

HOT

WATER

OUT

COLD WATER

INDIRECT

DHW TANK

BOILER 4

(MEMBER 3)

BOILER 3

(MEMBER 2)

UNION

(TYPICAL)

BOILER CIRCULATOR

BOILER 2

(MEMBER 1)

FLOW CHECK VALVE

DRAIN

ANTI-SCALD

MIXING VALVE

DOMESTIC

HOT WATER

CIRCULATOR

BOILER 1

(LEADER)

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

Page 47

7 Gas connections

Installation & Operation Manual

Connecting gas supply piping

1. Remove the top access panel and refer to FIG.’s 7-1 and 7-2 to pipe gas to the boiler.

a. Install ground joint union for servicing, when

required.

b. Install a manual shutoff valve in the gas supply

piping outside boiler jacket when required by local codes or utility requirements.

c. In Canada – When using manual main shutoff

valves, it must be identified by the installer.

2. Install sediment trap / drip leg.

Figure 7-1 Gas Supply Piping - Models 81 - 211

UNION

GAS SUPPLY

DRIP LEG

MANUAL SHUTOFF VALVE

3. Support piping with hangers, not by the boiler or its accessories.

 WARNING

The gas valve and blower will not support the weight of the piping. Do not attempt to support the weight of the piping with the boiler or its accessories. Failure to comply could result in severe personal injury, death, or substantial property damage.

4. Purge all air from the gas supply piping.

5. Before placing the boiler in operation, check the boiler and its gas connection for leaks.

a. The appliance must be disconnected from the gas

supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).

b. The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5 kPa).

c. The appliance and its gas connection must be leak tested before placing it in operation.

 WARNING

Do not check for gas leaks with an open flame – use the bubble test. Failure to use the bubble test or check for gas leaks can cause severe personal injury, death, or substantial property damage.

Figure 7-2 Gas Supply Piping - Model 286

SEDIMENT TRAP / DRIP LEG

6. Use pipe sealing compound compatible with propane

gases. Apply sparingly only to male threads of the pipe joints so that pipe dope does not block gas flow.

 WARNING

Failure to apply pipe sealing compound as detailed in this manual can result in severe personal injury, death, or substantial property damage.

 WARNING

Knight boilers are typically shipped ready to fire on natural gas. Check boiler rating plate to determine which fuel the boiler is set for. If set to natural gas, it may be converted to LP by installing an orifice (see page 13). In order to operate on LP gas, an orifice MUST BE installed. Failure to comply could result in severe personal injury, death, or substantial property damage.

Page 48

7 Gas connections

Installation & Operation Manual

 WARNING

Figure 7-3 Inlet Pipe with Backup Wrench

Use two wrenches when tightening gas piping at boiler (FIG. 7-3), using one wrench to prevent the boiler gas line connection from turning. Failure to support the boiler gas connection pipe to prevent it from turning could damage gas line components.

Natural gas:

Pipe sizing for natural gas

1. Refer to Table 7A for pipe length and diameter. Based on rated boiler input (divide by 1,000 to obtain cubic feet per hour).

a. Table 7A is only for natural gas with specific gravity

0.60 inches, with a pressure drop through the gas piping of 0.5 inches w.c.

b. For additional gas pipe sizing information, refer to

ANSI Z223.1 (or B149.1 for Canadian installations).

Natural gas supply pressure requirements

1. Pressure required at the gas valve inlet pressure port:

• Maximum 14 inches w.c. with no flow (lockup) or with boiler on.

• Minimum 4 inches w.c. with gas flowing (verify during boiler startup).

2. Install 100% lockup gas pressure regulator in supply line if inlet pressure can exceed 14 inches w.c. at any time. Adjust lockup regulator for 14 inches w.c. maximum.

NOTICE

Maximum inlet gas pressure must not exceed the value specified. Minimum value listed is for the purposes of input adjustment.

Propane Gas:

 WARNING

Pipe sizing for propane gas

1. Contact gas supplier to size pipes, tanks, and 100% lockup gas pressure regulator.

Propane Supply Pressure Requirements

1. Adjust propane supply regulator provided by the gas supplier for 14 inches w.c. maximum pressure.

2. Pressure required at gas valve inlet pressure port:

• Maximum 14 inches w.c. with no flow (lockup) or with boiler on.

• Minimum 8 inches w.c. with gas flowing (verify during boiler startup).

 WARNING

Ensure that the high gas pressure regulator is at least 6 - 10 feet upstream of the appliance.

Page 49

7 Gas connections (continued)

Table 7A Natural Gas Pipe Size Chart

Installation & Operation Manual

Nominal

Iron Pipe

Size (Inches)

1/2 3/4

1 1-1/4 1-1/2

2 2-1/2

 WARNING

175 120 97 82 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 369

697 1400 2150 4100 6460

11200 23500

256 477

974 1500 2820 4460 7900

16100

205 384

789 1210 2260 3610 6400

13100

1020 1950 3100 5400

11100

Natural Gas Pipe Capacity Chart

Length of Pipe in Straight Feet for 1/2 PSI

174 328 677

155 292 595

923 1720 2720 4870

10000

141 267 543

830 1560 2460 4410 9000

In order to operate on LP gas, an orifice MUST BE installed. Failure to comply could result in severe personal injury, death, or substantial property damage.

Check inlet gas supply

NOTICE

 WARNING

The gas piping must be sized for the proper flow and length of pipe, to avoid excessive pressure drop. Both the gas meter and the gas regulator must be properly sized for the total gas load.

If you experience a pressure drop greater than 1 inch w.c., the meter, regulator, or gas line is undersized or in need of service. Perform the steps below when checking inlet gas supply:

1. Turn the main power switch to the “OFF” position.

2. Shut off gas supply at the manual gas valve in the gas piping to the appliance.

CSA or UL listed flexible gas connections are acceptable, but you must exercise caution to ensure that the line has adequate capacity to allow your boiler to fire at full rate. Consult with local codes for proper installation or service procedures.

DO NOT adjust gas valve outlet pressure. The gas valve is factory-set for the correct outlet pressure. This setting is suitable for natural gas and propane, requiring no field adjustment. Attempting to alter the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death, or substantial property damage.

Single Unit

128 246 502

769 1440 2310 4000 8300

3. Loosen the set screw one (1) full turn from inside the pressure tap on top of the gas valve. Place the tubing of the manometer over the tap once the set screw is loosened as shown in FIG. 7-4.

4. Slowly turn on the gas supply at the field installed manual gas valve.

5. Turn the power switch to the “ON” position.

6. Adjust the temperature set point on the control panel of the SMART SYSTEM control module to call for heat.

7. Observe the gas supply pressure as the burner fires at 100% of rated input. Percent of burner input will be displayed on the control panel.

8. Ensure inlet pressure is within specified range. Minimum and maximum gas supply pressures are specified in this section of the manual.

9. If gas supply pressure is within normal range and no adjustments are needed, proceed on to Step 11.

10. If the gas pressure is out of range, contact the gas utility, gas supplier, qualified installer or service agency to determine the necessary steps to provide proper gas pressure to the control.

11. Turn the power switch to the “OFF” position.

12. Shut off the gas supply at the manual gas valve in the gas piping to the appliance.

13. Remove the manometer from the pressure tap on top of the gas valve. Re-tighten the set screw inside the pressure tap.

121 236 472

707 1330 2100 3800 7690

113 210 441

666 1250 2000 3540 7380

100

106 200 410

636 1180 1900 3330 6870

125

95 179 369 564

1100 1700 3000 6150

150

86 164 333 513 974

1540 2720 5640

175

79 149 308 472 871

1400 2500 5130

1300 2340 4720

200

74 138 287 441 820

Page 50

7 Gas connections

Installation & Operation Manual

 WARNING

14. Turn on the gas supply at the manual gas valve.

15. Turn the power switch to the “ON” position.

16. Adjust the temperature set point on the control panel of the SMART SYSTEM control module to the desired water temperature so the appliance will call for heat.

17. Check burner performance by cycling the system while you observe burner response. The burner should ignite promptly. Flame pattern should be stable. Turn system off and allow burner to cool, then cycle burner again to ensure proper ignition and flame characteristics.

Figure 7-4 Inlet Gas Supply Check

LOOSEN THE SET SCREW ONE (1) FULL TURN AND PLACE THE MANOMETER TUBING OVER THE PRESSURE TAP.

When re-tightening the set screw, be sure to tighten securely to prevent gas leaks.

Do not check for gas leaks with an open flame -- use the bubble test. Failure to use the bubble test or check for gas leaks can cause severe personal injury, death, or substantial property damage.

DETAIL

Gas Pressure

The gas pressure must remain between 4 inches w.c. (natural), 8 inches w.c. (LP) minimum and 14 inches w.c. (natural and LP) maximum during stand-by (static) mode and while in operating (dynamic) mode. If an in-line regulator is used, it must be a minimum of 10 feet from the Knight boiler. It is very important that the gas line is properly purged by the gas supplier or utility company. Failure to properly purge the lines or improper line sizing, will result in ignition failure.

The problem is especially noticeable in NEW LP installations and also in empty tank situations. This can also occur when a utility company shuts off service to an area to provide maintenance to their lines.

Gas valve replacement

The gas valve MUST NOT be replaced with a conventional gas valve under any circumstances. As an additional safety feature, this gas valve has a flanged connection to the venturi and blower.

 WARNING

Failure to follow all precautions could result in fire, explosion, or death!

Page 51

8 Field wiring

Installation & Operation Manual

 WARNING

NOTICE

 CAUTION

ELECTRICAL SHOCK HAZARD – For your safety, turn off electrical power supply before making any electrical connections to avoid possible electric shock hazard. Failure to do so can cause severe personal injury or death.

Wiring must be N.E.C. Class 1. If original wiring as supplied with boiler

must be replaced, use only type 105°C wire or equivalent.

Boiler must be electrically grounded as required by National Electrical Code ANSI/ NFPA 70 – latest edition.

This boiler is equipped with a feature that saves energy by reducing the boiler water temperature as the heating load decreases. This feature is equipped with an override, which is provided primarily to permit the use of an external energy management system that serves the same function. This override MUST NOT be used unless at least one of the following conditions is true:

1. An external energy management system is installed that reduces the boiler water temperature as the heating load decreases.

2. This boiler is not used for any space heating.

3. This boiler is part of a modular or multiple boiler system having a total input of 300,000 Btuh/hr or greater.

4. This boiler is equipped with a tankless coil.

Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.

Installation must comply with:

1. National Electrical Code and any other national, state, provincial, or local codes, or regulations.

2. In Canada, CSA C22.1 Canadian Electrical Code Part 1, and any local codes.

Line voltage connections

1. Connect 120 vac power wiring to the line voltage terminal strip in the junction box, as shown in FIG. 8-1.

2. Provide and install a fused disconnect or service switch (15 amp recommended) as required by the code (see FIG. 8-1).

3. The boiler pump is shipped loose. Wire the boiler pump as shown in FIG. 8-1.

4. When connecting a domestic hot water (DHW) pump, connect the wiring to the line voltage terminal strip as shown in FIG. 8-1.

5. To activate a system pump, wire as shown in FIG. 8-1. If the motor is larger than 1/8 hp or 1.8 amps, you must isolate with a relay.

Low voltage connections

1. Route all low voltage wires through the knockouts in the rear of the boiler, as shown in FIG. 8-2.

2. Connect low voltage wiring to low voltage connection board as shown in FIG. 8-3 on page 54 of this manual and the boiler wiring diagram.

Figure 8-2 Routing Field Wiring

Figure 8-1 Line Voltage Field Wiring Connections

LOW VOLTAGE CONNECTION BOARD

LOW VOLTAGE WIRING KNOCKOUTS

LINE VOLTAGE WIRING KNOCKOUTS

Page 52

8 Field wiring

Installation & Operation Manual

Thermostat

1. Connect the room thermostats or end switches (isolated contact only) to Heat/Loop Demand 1, 2, or 3, as shown in FIG. 8-3.

2. Install the thermostat on the inside wall away from influences of drafts, hot or cold water pipes, lighting fixtures, television, sunlight, or fireplaces.

3. Thermostat anticipator (if applicable):

a. If connected directly to boiler, set for 0.1 amps. b. If connected to relays or other devices, set to match

total electrical power requirements of connected devices. See device manufacturers’ specifications and thermostat instructions for details.

Outdoor temperature sensor

In the absence of an external energy management system, an outdoor temperature sensor must be used.

1. Mount the sensor on an exterior wall, shielded from direct sunlight or flow of heat or cooling from other sources.

2. Route sensor wires through a knockout at the rear of the boiler (see FIG. 8-2).

3. Connect outdoor temperature sensor (FIG. 8-3) to the outdoor sensor terminals on the connection board to enable outdoor reset operation of the Knight boiler.

Louver relay

If louvers need to operate when the boiler fires, they can be controlled by this output. Connect these terminals to a 24 vac relay coil, which is wired to operate the louvers (FIG. 8-3).

Louver proving switch

When the operation of the louvers needs to be verified before

the boiler fires, remove the jumper wire from these terminals and connect them to the normally open contacts on its proving switch (FIG. 8-3).

High gas pressure switch

If a switch is provided to detect excessive gas pressure, remove

the jumper wire from the terminals on the connection board, and then connect them to its normally closed contacts (FIG. 8-3).

Low gas pressure switch

1. If a switch is provided to detect low gas pressure, remove the jumper wire from the terminals on the connection board and connect them to its normally open contacts (FIG. 8-3).

2. If both a high and low gas pressure switch is used, connect their respective contacts in series, and connect them to the terminals on the connection board (FIG. 8-3).

DHW thermostat

Connect storage indirect water heater (DHW) thermostat (FIG. 8-3) to the DHW thermostat terminals on the connection board. If a tank sensor is connected (see DHW Tank Sensor below) the tank thermostat is ignored.

DHW tank sensor

1. By installing a tank sensor, the SMART SYSTEM control can perform the tank thermostat function. The SMART SYSTEM control automatically detects the presence of this sensor and generates a DHW call for heat when the tank temperature drops 6°F (3°C) below the tank set point and finishes the call for heat when the tank temperature reaches the tank set point.

2. The tank sensor included with the Lochinvar Squire Indirect DHW tank (TST20015) is the only sensor suitable for use with the SMART SYSTEM control. Connect the sensor leads to the Tank Sensor terminals on the Low Voltage Connection Board (FIG. 8-3).

 WARNING

3. If the TST20015 is not compatible with the indirect tank, a tank thermostat can be used to control the boiler. The tank thermostat should be installed per the manufacturers instructions and wired to the DHW Thermostat terminals on the Low Voltage Connection Board.

Failure to use the correct sensor may result in the tank temperature being either above or below the set point.

Variable speed system pump

If a variable speed pump is used in the primary loop, and a

0-10V signal is available from the pump speed control, this signal can be used by the SMART SYSTEM control to anticipate changes in the building heat load. By connecting this 0 - 10V signal to the 0 - 10V SYS PUMP IN terminals, the boiler (or cascade) can modulate up and down as the primary flow increases and decreases.

Boiler pump speed output

This 0 - 10V output is available to control the speed of a variable speed boiler pump. The SMART SYSTEM control will vary the speed of this pump in order to maintain a minimum T across the heat exchanger, as well as prevent high limit lockouts when the flow in the primary loop is extremely low. Connect this output to the 0 - 10V input on the boiler pump speed control.

Rate output

This output provides a 0 - 10V signal that is proportional to the firing rate of the boiler. This may be used by a BMS system to monitor the actual rate of the boiler.

ModBus

When the optional ModBus interface module is installed, the RS-485 ModBus cable is connected to these terminals. Use shielded, 2-wire twisted pair cable. If desired, the shield can be connected to ground by installing a jumper wire between terminals 1 and 3 on connector X5 on the optional ModBus interface module.

Page 53

8 Field wiring (continued)

Installation & Operation Manual

Flow switch

1. A flow switch is used to guarantee flow through the boiler before allowing it to fire. The flow switch must be installed at the boiler outlet.

2. Remove the jumper wire from these terminals, and connect these terminals to the normally open contacts on the flow switch (FIG. 8-3).

System supply sensor

1. By installing the system supply sensor into the supply

of the primary loop, the temperature of the primary supply can be controlled. The SMART SYSTEM control automatically detects the presence of this sensor, and controls the boiler firing rate to maintain the system supply temperature to the set point (if the outlet sensor control is currently selected). If it is desired to control the system return temperature, then program the SMART SYSTEM control to use the inlet sensor as the controlling sensor. See the Knight Boiler Service Manual for instructions on how to use the inlet sensor as the controlling sensor. When the inlet sensor is programmed as the controlling sensor, it is vital that the SYSTEM SUPPLY sensor be installed. DO NOT INSTALL THE SYSTEM SUPPLY SENSOR INTO THE SYSTEM RETURN.

2. The TST2032 sensor provided with the boiler must be

used for the system sensor.

3. Connect these terminals to the system supply sensor

(FIG. 8-3).

Boiler management system

The United States Energy Policy and Conservation Act requires residential heating boilers with inputs less than 300,000 Btu/hr be equipped with a control that automatically adjusts boiler water temperature in relation to heat demand. An external control may be connected to control the firing rate or the set point of the boiler provided that either an external energy management system is installed that reduces the boiler water temperature as the heating load decreases, the boiler is not used for any space heating, or the boiler is part of a modular or multiple boiler system having a total input of 300,000 Btu/hr or greater.

1. An external control may be connected to control either

the firing rate or the set point of the boiler. If the external control uses a set of contacts to enable the boiler, connect the contacts to the Heat/Loop Demand 1 terminals. Otherwise, the SMART SYSTEM control will be enabled by the 0-10V signal.

2. Make sure the (-) terminal is connected to the (-) or

common output terminal of the external control, and the 0 - 10 Vdc terminal is connected to the 0 - 10 Vdc terminal of the external control. Make sure the (-) voltage is not below ground.

Runtime contacts

The SMART SYSTEM control closes a set of dry contacts whenever the burner is running. This is typically used by Building Management Systems to verify that the boiler is responding to a call for heat.

Alarm contacts

The SMART SYSTEM control closes another set of contacts whenever the boiler is locked out or the power is turned off. This can be used to turn on an alarm, or signal a Building Management System that the boiler is down.

Wiring of the cascade

When wiring the boilers for Cascade operation, select one boiler as the Leader boiler. The remaining boilers will be designated as Members. See page 61 “Configuration of the Cascade” for a detailed explanation of this procedure.

Connect the system supply sensor and outdoor air sensor (if used) to the Leader boiler. For the Cascade system to work properly the system supply sensor must be installed. The location of the system supply sensor should be downstream of the boiler connections in the main system loop (FIG.’s 6-4, 6-6, and 6-8). The system supply sensor should be wired to the Low Voltage Connection Board at the terminals marked for the system sensor (see FIG. 8-3). The Leader control will use the water temperature at the system supply sensor to control the operation of the Cascade.

If outdoor air reset is desired, the outdoor air sensor should be wired to the Low Voltage Connection Board at the terminals marked for the outdoor air sensor (FIG. 8-3). If the outdoor air sensor is connected, the Leader control will calculate the water temperature set point based on the programmed reset curve parameters. If the outdoor air sensor is not connected, the Leader control will maintain the fixed water temperature set point that is programmed into the control.

If a Thermostat, Zone Control enable output, or Building Management System enable output is available, it should be wired to the Low Voltage Connection Board on the Leader boiler at the terminals marked for one of the heat/ loop demands 1-3 (FIG. 8-3). If the boilers are to run continuously, connect a jumper wire between the R and W terminals for the heat/loop demand input. This will initiate a call for heat on the Cascade.

Communication between the Leader boiler and the Member boilers is accomplished by using shielded, 2-wire twisted pair communication cable. Connect one of the twisted pair wires to Cascade terminal A on each of the Low Voltage Connection boards, and the other wire of the twisted pair to Cascade terminal B on each of the Low Voltage Connection Boards. Connect the shield wires to one of the shield terminals on the Low Voltage Connection Boards (FIG. 8-3). If more than two boilers are on the Cascade, daisy chain the wiring from the Cascade terminals on the second boiler to the Cascade terminals on the third boiler, then from the third to the forth, and so on. The connections between boilers can be made in any order, regardless of the addresses of the boilers. Try to keep each cable as short as possible.

Page 54

8 Field wiring

Figure 8-3 Low Voltage Field Wiring Connections

Installation & Operation Manual

IMG00127

BOILER

FROM

BOILER

SHIELD SHIELD

TANK SENSOR

OUTDOOR SENSOR

SYSTEM SUPPLY SENSOR

SPEED

CONTROL

SYSTEM PUMP

PUMP

BOILER

NOTE:

CONNECTION BOARD SPLIT FOR

ILLUSTRATION PURPOSES

B A

SYSTEM

BUILDING

MANAGEMENT

NEEDED

WIRE AS

LOW WATER

CUTOFF

COM

LOUVER

LOUVER RELAY

PROVING SWITCH

FLOW SWITCH

TANK THERMOSTAT

ROOM THERMOSTAT 1

ROOM THERMOSTAT 2

ROOM THERMOSTAT 3

Page 55

9 Condensate disposal

Installation & Operation Manual

Condensate drain

1. This boiler is a high efficiency appliance that produces condensate.

2. The side of the boiler has a 1/2 inch PVC union for connection of a 1/2 inch PVC pipe (FIG. 9-1).

3. Slope condensate tubing down and away from the boiler into a drain or condensate neutralizing filter. Condensate from the Knight boiler will be slightly acidic (typically with a pH from 3 to 5). Install a neutralizing filter if required by local codes.

A Neutralizer Kit (FIG. 9-1) is available from the factory

(Kit 3087).

4. Install the 1/2 inch PVC tee assembly (shipped with the unit) as shown in FIG. 9-1.

5. Leave the top of the 1/2 inch tee OPEN. This is needed as a vacuum break.

6. Do not expose condensate line to freezing temperatures.

7. Use only plastic tubing or piping as a condensate drain line (FIG. 9-1).

NOTICE

8. A condensate removal pump is required if the boiler is below the drain. When installing a condensate pump, select one approved for use with condensing boilers and furnaces. The pump should have an overflow switch to prevent property damage from condensate spillage. The switch should be wired in series with the blocked drain switch inside the boiler (see FIG. 10-1 on page 57).

Use materials approved by the authority having jurisdiction. In the absence of other authority, PVC and CPVC pipe must comply with ASTM D1785 or D2845. Cement and primer must comply with ASME D2564 or F493. For Canada use CSA or ULC certified PVC or CPVC pipe, fittings, and cement.

To allow for proper drainage on large horizontal runs, a second line vent may be required and tubing size may need to increase to 1 inch.

The condensate line must remain unobstructed, allowing free flow of condensate. If condensate is allowed to freeze in the line or if the line is obstructed in any other manner, condensate can exit from the boiler tee, resulting in potential water damage to property.

Figure 9-1 Condensate Disposal

1/2" PVC TEE ASSEMBLY (FACTORY SUPPLIED)

1/2" PVC UNION (FACTORY SUPPLIED)

NEUTRALIZER KIT

FLOOR DRAIN OR DRAIN PAN

Page 56

10 Start-up

Installation & Operation Manual

Check/control water chemistry

 CAUTION

Hardness less than 7 grains

1. Consult local water treatment companies for hard water areas (above 7 grains hardness).

Chlorine concentration less than 200 ppm

1. Do not fill boiler or operate with water containing chlorine in excess of 200 ppm.

2. Filling with chlorinated fresh water should be acceptable since drinking water chlorine levels are much lower.

3. Do not use the boiler to directly heat swimming pool or spa water.

Test/replace freeze protection fluid

1. For systems using freeze protection fluids, follow fluid manufacturer’s instructions.

2. Freeze protection fluid must be replaced periodically due to degradation of inhibitors over time. Follow all fluid manufacturer’s instructions.

Do not use petroleum-based cleaning or sealing compounds in the boiler system. Damage to elastomer seals and gaskets in the system could occur, resulting in substantial property damage.

Freeze protection (when used)

1. Determine freeze protection fluid quantity using

system water content, following fluid manufacturer’s instructions. Boiler water content is listed on page 7. Remember to include expansion tank water content.

2. Local codes may require a backflow preventer or actual

disconnect from city water supply.

3. When using freeze protection fluid with automatic fill,

install a water meter to monitor water makeup. Freeze protection fluid may leak before the water begins to leak, causing concentration to drop, reducing the freeze protection level.

4. The freeze protection set points may be lowered when

freeze protection fluid is used (see the Knight Service Manual).

Fill and test water system

1. Fill system only after ensuring the water meets the requirements of this manual.

2. Close manual and automatic air vents and boiler drain valve.

3. Fill to correct system pressure. Correct pressure will vary with each application.

a. The minimum cold water fill pressure for a residential system is 12 psi.

b. Pressure will rise when boiler is turned on and

system water temperature increases.

4. At initial fill and during boiler startup and testing, check system thoroughly for any leaks. Repair all leaks before proceeding further.

 WARNING

Eliminate all system leaks. Continual fresh makeup water will reduce boiler life. Minerals can build up in the heat exchanger, reducing heat transfer, overheating the heat exchanger, and causing heat exchanger failure.

Purge air from water system

1. Purge air from system:

a. Connect a hose to the purge valve (see purge/drain

valves, in piping diagrams on pages 40 through 46). Route the hose to an area where water can drain and be seen.

b. Close the boiler or system isolation valve between

the purge valve and fill connection to the system.

c. Close zone isolation valves. d. Open quick-fill valve on cold water makeup line. e. Open purge valve. f. One zone at a time, open the isolation valves. Allow

water to run through the zone, pushing out the air. Run until no noticeable air flow is present. Close the zone isolation valves and proceed with the next zone. Follow this procedure until all zones are purged.

g. Close the quick-fill water valve and purge valve and

remove the hose. Open all isolation valves. Watch that system pressure rises to correct cold-fill pressure.

h. After the system has operated for a while, eliminate

any residual air by using the manual air vents located throughout the system.

i. If purge valves are not installed in the system, open

the manual air vents in the system one at a time, beginning with the lowest floor. Close the vent when water squirts out. Repeat with remaining vents.

2. Open automatic air vent (diaphragm-type or bladder-type expansion tank systems only) one turn.

3. Open other vents:

a. Starting on the lowest floor, open air vents one at a

time until water squirts out.

b. Repeat with remaining vents.

4. Refill to correct pressure.

Page 57

10 Start-up (continued)

Installation & Operation Manual

Check for gas leaks

 WARNING

Figure 10-1 Condensate Trap

Before starting the boiler, and during initial operation, smell near the floor and around the boiler for gas odorant or any unusual odor. Remove the top access panel and smell the interior of the boiler enclosure. Do not proceed with startup if there is any indication of a gas leak. Use an approved leak detection solution. Repair any leaks at once.

DO NOT adjust gas valve outlet pressure. The gas valve is factory set for the correct outlet pressure. This setting is suitable for natural gas and propane, requiring no field adjustment. Attempting to alter the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death, or substantial property damage.

RETAINING

SCREW

 WARNING

Propane boilers only – Your propane supplier mixes an odorant with the propane to make its presence detectable. In some instances, the odorant can fade, and the gas may no longer have an odor. Before startup (and periodically thereafter), have the propane supplier verify the correct odorant level in the gas.

Check thermostat circuit(s)

1. Disconnect the two external wires connected to each of the heat/loop demand terminals on the connection board.

2. Connect a voltmeter across these two incoming wires. Close each thermostat, zone valve, and relay in the external circuit one at a time and check the voltmeter reading across the incoming wires.

3. There should NEVER be a voltage reading.

4. If a voltage does occur under any condition, check and correct the external wiring. (This is a common problem when using 3-wire zone valves.)

CONDENSATE FROM

HEAT EXCHANGER

2” PVC CAP WITH

BLOCKED DRAIN SWITCH

PVC TEE ASSEMBLY

(FACTORY SUPPLIED)

TO FLOOR

DRAIN

5. Once the external thermostat circuit wiring is checked and corrected if necessary, reconnect the external thermostat circuit wires to the connection board.

Inspect/fill condensate system

Inspect/check condensate lines and fittings

1. Inspect the condensate drain line, condensate PVC fittings and condensate trap.

Fill condensate trap with water

1. Remove the PVC cap retaining screw from the PVC cap (FIG. 10-1).

2. Remove the 2 inch PVC cap with the switch located at the top of the trap (FIG. 10-1).

3. Fill with fresh water until the water begins to pour out of the drain.

4. Replace the cap. Press the cap onto the trap until the cap makes contact with the drain.

5. Replace the retaining screw.

 WARNING

The condensate trap (FIG. 10-1) must be filled with water during all times of boiler operation to avoid flue gas emission from the condensate drain line. Failure to fill the trap could result in severe personal injury or death.

Page 58

10 Start-up

Final checks before starting the boiler

Installation & Operation Manual

 Check vent piping and air piping

 Read the Knight Boiler Service Manual to familiarize

yourself with SMART SYSTEM control module operation. Read this manual, page 59 for proper steps to start boiler.

 Verify the boiler and system are full of water and all

system components are correctly set for operation.

 Verify the preparation procedures of Section 10, pages 56

and 57 have been completed.

 Fill the vent condensate trap with water (removing the

retaining screw in order to remove the 2 inch PVC cap with the switch located at the top of the trap). Replace the cap. Press the cap onto the trap until the cap makes contact with the drain. Replace the retaining screw.

 Verify electrical connections are correct and securely

attached.

 Inspect vent piping and air piping for signs of deterioration

from corrosion, physical damage or sagging. Verify air piping and vent piping are intact and correctly installed per this manual.

Start the boiler

1. Read and follow the Operating instructions in FIG. 10-2, page 59.

If boiler does not start correctly

1. Check for loose connections, blown fuse or service switch off?

2. Is boiler water temperature above 200°F?

3. Is thermostat set below room temperature?

4. Is gas turned on at meter or boiler?

5. Is incoming gas pressure less than 4 inches w.c.?

If none of the above corrects the problem, refer to the Troubleshooting Section of the Knight Boiler Service Manual.

1. Check for gastight seal at every connection, seam of air piping, and vent piping.

 WARNING

 Check gas piping

1. Check around the boiler for gas odor following the procedure on page 47 of this manual (connecting gas supply piping).

 WARNING

 Propane boilers – verify conversion

1. Verify propane conversion has been completed per the Propane Conversion instructions.

 WARNING

Venting system must be sealed gastight to prevent flue gas spillage and carbon monoxide emissions, which will result in severe personal injury or death.

If you discover evidence of any gas leak, shut down the boiler at once. Find the leak source with a bubble test and repair immediately. Do not start the boiler again until corrected. Failure to comply could result in severe personal injury, death, or substantial property damage.

Check flame and combustion

Check system and boiler

 Check water piping

1. Check system piping for leaks. If found, shut down the boiler and repair immediately. (See WARNINGS on pages 56 and 57 (startup) regarding failure to repair leaks.)

2. Vent any remaining air from the system using manual vents. Air in the system will interfere with circulation and cause heat distribution problems and noise.

1. Turn the main power off to the boiler by placing the “On/ Off” switch in the OFF position.

2. Remove the flue temperature sensor from the flue pipe connection. NOTE: Combustion measurements will be made at this point.

3. Turn the main power on to the boiler by placing the “On/ Off” switch in the ON position.

Page 59

10 Start-up (continued)

Figure 10-2 Operating Instructions

Installation & Operation Manual

Page 60

Installation & Operation Manual

10 Start-up

Check flame and combustion (continued) Set space heating operation

NOTICE

4. Place the boiler into the active position by pressing the RIGHT SELECT [ON] key (FIG. 11-1, page 68).

5. Locate the pinhole button below the RESET button on the display board (FIG. 11-1). Insert a thin wire (such as a paper clip) into the hole and press the button once and hold for 5 seconds to place the boiler into Service Mode. In Service Mode the boiler will fire at ignition speed and will then modulate up to full fire.

6. Insert the probe from a combustion analyzer into the hole left by the removal of the flue temperature sensor.

7. Once the boiler has modulated up to full fire, measure the combustion. The values should be in the range listed in Table 10A below. The CO levels should be less than 150 ppm for a properly installed unit.

If the combustion is not within the specified range,

reference the Troubleshooting Section of the Knight Boiler Service Manual for possible causes and corrective actions.

Table 10A Flue Products Chart

Natural Gas Propane

8.0% - 10% 3.0% - 6.5% 9.0% - 11% 4.1% - 6.9%

8. Once the combustion analysis is complete, test the safety

shutoff device by turning the manual shutoff switch to the OFF position and ensuring that the boiler shuts down and registers an alarm. Turn the manual shutoff switch to the ON position and reset the control.

9. Turn the main power off to the boiler and replace the flue

temperature sensor into the flue pipe connection.

10. Place the boiler back into normal operation.

 WARNING

Please note that the brackets ([]) denote screen status.

You must replace the flue gas temperature sensor to prevent flue gas spillage into the room. Failure to comply could result in severe personal injury, death, or substantial property damage.

Determine controlling sensor

For space heating systems, the temperature control can be based on one of three sensors; the inlet, outlet, or system supply sensor. The SMART SYSTEM control is programmed at the factory to control the temperature of the outlet sensor. The control will automatically switch to the system supply sensor once it is connected. If it is desired to base the temperature control on the inlet sensor, the appropriate parameter must be changed in the control. See the Knight Boiler Service Manual for a detailed explanation of this procedure.

Verify space heat circulator mode

The Space Heating Mode controls both the system pump (if connected), and the boiler pump. When the SMART SYSTEM control receives a space heating call for heat, it turns on the system pump. If the boiler is not heating an indirect DHW (Domestic Hot Water) tank, and the set point is not met, it also turns on the boiler pump. After the space heating call for heat ends, the system pump continues to run for a short period of time. The system pump can be programmed to run continuously, except during outdoor shutdown. If the boiler pump was running, it continues to run for a short period of time as well. These pump delays are factory set to 30 seconds. If different delays are desired, the appropriate parameters in the control must be changed. See the Knight Boiler Service Manual for a detailed explanation of this procedure.

Adjust set point temperature(s)

NOTICE

The NAVIGATION dial may be used during normal operation to adjust the space heating and tank set point temperatures.

1. From the Status Screen press the NAVIGATION dial.

2. Turn the NAVIGATION dial counterclockwise to select the appropriate set point.

3. Press the NAVIGATION dial to adjust the temperature.

4. Once the desired temperature is displayed, press the RIGHT SELECT [SAVE] key.

5. If necessary repeat Steps 3 and 4 to make adjustments to additional set points.

6. Press the RIGHT SELECT [HOME[ key to upload the changes.

7. If the RIGHT SELECT [SAVE] key is not pressed, the new settings will be discarded.

Please note that the brackets ([]) denote screen status.

Page 61

10 Start-up (continued)

Set domestic hot water (DHW) operation

Installation & Operation Manual

Verify DHW mode

There are two (2) modes of operation for DHW. In Normal Mode, when a DHW demand begins, the control will start the DHW pump, turn off the boiler pump (if running), and modulate to bring the outlet temperature to the DHW boiler set point. The maximum firing rate may be limited in this mode if desired.

In Zone Mode it is assumed that the indirect DHW tank is piped as a zone on the primary loop. When a DHW demand begins, the control will turn on the DHW pump output, and raise the system temperature set point to the DHW boiler set point (if higher). The boiler pump will be turned on. The system pump may be forced on, forced off, or not changed, depending on the System Pump Mode selected (reference the Knight Service Manual for details). In this mode, any low temperature zones (such as radiant heating) may need additional controls to limit the water temperature sent to those zones.

Set DHW boiler target temperature

When in the DHW Mode, the control will modulate to maintain the boiler outlet temperature or system supply temperature to a set point. This set point is set at the factory to 180°F. If a different set point is desired, the appropriate parameter in the control must be changed. See the Knight Boiler Service Manual for a detailed explanation of this procedure.

Set maximum DHW fan speed

If the rated input of the indirect tank is less than the maximum output of the boiler, change the maximum DHW fan speed setting to limit the boiler output accordingly, see the Knight Boiler Service Manual for a detailed explanation of this procedure.

Set clock

NOTICE

The SMART SYSTEM control has a built-in clock that it uses for its night setback feature and for logging events. This clock must be set when the boiler is installed, and anytime the boiler has been powered off for more than 4 hours. Use the following procedure to set the clock:

1. Press and hold the LEFT SELECT [MENU] key for at least 5 seconds.

2. The display changes to read [PASSWORD], with four (4) zeros below it.

3. Press the RIGHT SELECT [SAVE] key.

4. The display will then show a menu with the time and date and temperature unit.

5. Press the NAVIGATION dial twice.

6. Turn the NAVIGATION dial to adjust the hours. Press the NAVIGATION dial.

7. Turn the NAVIGATION dial to adjust the minutes. Press the NAVIGATION dial.

Please note that the brackets ([]) denote screen status.

8. Turn the NAVIGATION dial to adjust the month. Press the NAVIGATION dial.

9. Turn the NAVIGATION dial to adjust the date. Press the NAVIGATION dial.

10. Turn the NAVIGATION dial to adjust the year. Press the RIGHT SELECT [SAVE] key.

11. Press the RIGHT SELECT [HOME] key.

NOTICE

The clock is automatically updated whenever a PC is connected and the Win Pro-Installer program is started.

Configuration of the cascade

NOTICE

When installed in a Cascade system, the individual controls must be programmed for cascade operation. This is accomplished by accessing the control parameters.

Press the [MENU] key for at least five (5) seconds. Input the Installer code as described in the Knight Boiler Service Manual. Once the control parameters have been accessed, use the NAVIGATION dial to select the Control Mode parameters. Press the NAVIGATION dial to access these parameters.

Rotate the NAVIGATION dial to select the parameter “Cascade Address”. Press the NAVIGATION dial to access this parameter. Each appliance in the Cascade system must be programmed with its own address. The boiler designated as the Leader will have an address of 0. The remaining boilers in the Cascade will be Members and have addresses from 1

- 7. Rotate the NAVIGATION dial to select the appropriate address. Press the RIGHT SELECT [SAVE] key.

Press the RIGHT SELECT [HOME] key to upload the address into the control. Repeat this procedure for all boilers in the Cascade, designating the Leader control and the Member controls.

The internal clock does not adjust for Daylight Savings Time and therefore, will require a manual adjustment.

Please note that the brackets ([]) denote screen status.

Page 62

11 Operating information

General

How the boiler operates

The Knight boiler uses an advanced stainless steel heat exchanger and electronic control module that allows fully condensing operation. The blower pulls in air and pushes flue products out of the boiler through the heat exchanger and flue piping. The control module regulates blower speed to control the boiler firing rate. The gas valve senses the amount of air flowing into the boiler and allows only the right amount of gas to flow.

How the control module operates

The SMART SYSTEM control module receives inputs from boiler sensors and external devices. The control module activates and controls the blower and gas valve to regulate heat input and switches the boiler, Domestic Hot Water (DHW), and system pumps on and off as needed. The user programs the module to meet system needs by adjusting control parameters. These parameters set operating temperatures and boiler operating modes. Boiler operation can be based on boiler outlet water temperature, boiler inlet water temperature, system temperature, a 0-10V signal or Modbus, depending on the parameter settings.

Control inputs and outputs

Room thermostat

There are three (3) heat/loop demand connections available on this control. These inputs tell the boiler to provide water for space heating. Each demand connection has its own set point and outdoor air reset curve. When multiple demands have a call for heat the control will give priority to the demand with the highest set point.

Example: Assume that both heat/loop demand 1 and heat/loop demand 2 have a call for heat. Demand 1 has a set point of 110°F. Demand 2 has a set point of 140°F. The boiler will regulate the system temperature to 140°F until Demand 2 has been satisfied. Once Demand 2 has been satisified the boiler will provide 110°F water to the system.

 CAUTION

SMART SYSTEM Multi-temp loop control

The Knight boiler is capable of producing up to three (3) set point temperatures to meet different space heating demands. This device controls the temperatures of up to three (3) separate loops, based on the settings for the three (3) heat/ loop demands (reference Lochinvar kit RLY30086).

0 - 10V input (set point or power)

The Knight boiler can be controlled by a Building Management System (BMS) provided that either an external energy managmenet system is installed that reduces the boiler water temperature as the heating load decreases, the boiler is not used for any space heating, or the boiler is part of a modular or multiple boiler system having a total input of 300,000 Btu/hr or greater.

When multiple temperature loops are used, mixing valves are required for the protection of any low temperature loops.

Installation & Operation Manual

The control can be configured by the installer to use a 0 - 10 Vdc signal to either control set point or firing rate.

The Knight boiler can also be programmed to accept a call for heat from a 0 - 10V signal, reference the Knight Boiler Service Manual for a detailed explanation of this procedure.

DHW priority

The SMART SYSTEM control allows the connection of a DHW thermostat or tank sensor to the low voltage connection board. When a tank sensor is connected, the DHW thermostat input is ignored. When a boiler is programmed for DHW Normal Mode, the maximum firing rate can be limited to match the input rating of the indirect tank coil.

DHW / space heating (SH) cycling

If a DHW call for heat is received while a space heating call is in progress, and the DHW is in Normal Mode, the control will start the DHW pump and shut the boiler pump off. The system pump will remain on. For stand-alone boilers, if the space heating call is still active while the DHW call is in operation, the control will wait for 30 minutes (time adjustable by installer) then it will switch back to the space heating demand. There is a timer to switch from space heating to DHW and a timer to switch from DHW to space heating. The control will switch back and forth until one of the heat demands end.

Programmable controlling sensor

The control module is programmed to use the outlet sensor as the control sensor by default. If a system supply sensor is connected, the control automatically uses it as the control sensor. For stand-alone boilers, the control sensor can be changed by the installer to the inlet sensor. If the inlet sensor is chosen as the controlling sensor, it is recommended that the system supply sensor be installed in the system supply in order to provide the best control of the inlet temperature.

Anti-cycling

After the burner turns off, the control will delay the next burner cycle for a set time period (time is adjustable by the installer). The time delay will be bypassed if the inlet water temperature drops too far during the delay.

Boiler and system pump control

The boiler pump will run whenever the burner is firing, unless the DHW is programmed for Normal Mode and the boiler is heating the DHW tank. The boiler pump will run during Freeze Protection Mode as well. It will continue to run for a short time after the burner turns off or the Freeze Protection Mode ends.

The system pump will run whenever there is a space heating call for heat, or the boiler goes into Freeze Protection Mode. It may be programmed to run during a DHW call for heat when the DHW is programmed for Zone Mode. It will continue to run for a short time after the end of the heat demand or the Freeze Protection Mode. The system pump can be programmed to run continuously if desired, except during outdoor shutdown and/or a DHW call for heat.

Page 63

11 Operating information (continued)

Installation & Operation Manual

Temperature control

Modulation

The Knight boiler is capable of modulating its firing rate from a minimum of 20% to a maximum of 100%. The firing rate is dictated by the call for heat (i.e., space heating or domestic hot water), the heating load, ramp delay (if enabled), and various other temperature limitations.

Ramp delay

For systems with lower flow, the SMART SYSTEM can limit the firing rate (when enabled) when a space heating call for heat starts, or when switching from a DHW call for heat to a space heating call for heat. There are six (6) limits that can be programmed, as well as six (6) time intervals corresponding to each limit. The sixth limit will also limit the firing rate for the rest of the call for heat.

Gradient limiting

If during operation of the boiler the outlet water temperature is rising too quickly, the control will reduce the firing rate to its lowest setting.

Outdoor air reset

With the outdoor air sensor connected, the control module will calculate the set points of the three (3) space heating demands based on the programmed reset curves. The installer can change the slope of the reset curves by several adjustable parameters. The user can limit the maximum set point for the system using the space heating set points.

Boost function

If outdoor air reset is active, and any space heating demand has been active continuously for a set period of time (time adjustable by installer) and there has been no DHW demands, the control will increase the set point of that demand by a fixed number of degrees (adjustable by installer). This process will continue until the space heating demand ends, the set point reaches the programmed set point or a maximum of 20 increases has occurred. Once the system heat demand is satisfied, the set point will revert to the value determined by the reset curve.

Night setback

The controller may be programmed to reduce the space heating and DHW set points during certain times each week. Seven different start and stop times may be programmed for the space heating setback and seven start and stop times for the DHW setback. Any night setback event scheduled within the next seven (7) days can be temporarily bypassed if desired.

Flame current support

To prevent nuisance shutdowns when the boiler is firing at minimum rates, the control will increase the firing rate when the flame signal drops too low.

Protection features

Outlet temperature, flue temperature, and temperature rise limiting

The outlet temperature is monitored by the boiler outlet temperature sensor. When the outlet temperature exceeds 185°F, the unit will reduce the fan speed. If the outlet water temperature exceeds 195°F the control will shut the unit down until it cools off.

The control module monitors the flue temperature by a sensor located in the flue exhaust. If the flue temperature exceeds 215°F the control will reduce the maximum fan speed. If the flue temperature exceeds 240°F the control will shut the unit down. The unit will restart automatically once the flue temperature drops 25°F and the minimum off time has expired.

The control monitors the temperature difference between the inlet and the outlet sensor. If this difference exceeds 55°F the control will reduce the maximum fan speed. If the temperature difference exceeds 60°F the control will shut the unit down. The unit will restart automatically once the temperature difference has dropped below 55°F and the minimum off time has expired.

Freeze protection

DO NOT install the boiler in a room likely to freeze.

The following integral feature of the SMART SYSTEM control module provides some protection for the boiler only

-- not for the system.

• The SMART SYSTEM control module provides freeze-up protection as follows when the boiler water temperature drops below 45°F:

• Below 45°F, the boiler and system pumps operate constantly.

• Below 37°F, the boiler turns on.

• Boiler and pumps turn off if boiler water temperature rises above 45°F.

• Lower temperatures may be programmed for systems with anti-freeze solutions.

NOTICE

 CAUTION

When system return temperatures are maintained below the dew point, condensation will form on the inside of the boiler jacket causing some internal sheet metal components to rust.

This feature of the SMART SYSTEM control module does not eliminate the possibility of freezing. The installation must still use recognized design, installation and maintenance practice to prevent freeze potential for the boiler and system.

Page 64

11 Operating information

Monitor external limits

Connections are provided on the connection board for external limits such as flow switch, low water cutoff, gas pressure switches, and a louver proving switch. The SMART SYSTEM will shut off the burner and inhibit relighting whenever any of these external limits open.

Run-time and alarm outputs

The boiler provides dry contacts for indicating when the boiler is running, and when it is unable to operate.

Run-time and cycle counting

The control uses two timers to monitor the total hours of burner operation. One timer monitors the time the boiler is firing in the Space Heating Mode. The other timer monitors the time the boiler is firing in the DHW Mode.

The control uses two (2) ignition counters to monitor the amount of boiler cycles. The first counter counts all ignitions of the control. The second counter counts only ignition attempts that have failed.

Service reminder

The control can be programmed for service reminder notification. This notification will become active when either a set time frame has expired, or a set amount of running hours or cycles has expired (all adjustable by the installer). The display will show a Maintenance Required screen. The installer's name and phone number can be programmed into the control. This information will appear on the Maintenance Required screen. The service reminder notification can be reset or disabled by the installer.

The time dependent feature has been disabled by the manufacturer. To enable this feature change the parameter to the desired time interval, reference the Knight Service Manual for details regarding parameters.

Error logging

The control will hold in memory the last 10 lockouts as well as the last 10 blockings. The date and time of the occurrence will be recorded as well. Only the 10 most current occurrences of each will be held in memory.

Boiler temperature regulation

Operating temperature (target)

The SMART SYSTEM control module senses water temperature and regulates boiler firing and firing rate to achieve a target temperature. The target temperature can be set between 32°F and 190°F.

• Target temperature is calculated as described in the “Outdoor Reset Operation” section, when the outdoor sensor is connected.

• If the outdoor sensor is not connected, the target temperature is fixed at SH (1 - 3) set points. An outdoor sensor fault will remain on the display screen until the outdoor sensor is reconnected.

High limit operations

The Knight boiler is equipped with adjustable automatic reset and manual reset high limits. The automatic reset high limit has a maximum set point of 200°F and the manual reset high limit has a maximum set point of 210°F.

Installation & Operation Manual

When the outlet temperature exceeds 200°F, the automatic high limit action occurs. The boiler shuts down until the outlet water temperature cools below 190°F, and a 60 second timer has expired. If the outlet temperature continues to increase, the manual reset high limit action will occur at 210°F.

High limit test procedure

NOTICE

1. Turn ON the main power to the boiler by placing the ON/OFF switch in the ON position.

2. From the Status Screen, press the NAVIGATION dial to access the Set Points Screen.

3. Press the LEFT SELECT (LIMITS) key.

4. Select the manual reset high limit (MRHL) by rotating the NAVIGATION dial counterclockwise, then press the NAVIGATION dial.

5. Decrease the set point of the MRHL to below the current outlet temperature (or to its minimum setting, whichever is higher) by turning the NAVIGATION dial counterclockwise.

6. Press the RIGHT SELECT [SAVE] key.

7. Press the RIGHT SELECT [HOME] key. The new parameter will upload to the control.

8. If the current outlet temperature is above the new MRHL set point, the MRHL will function causing boiler lockout. If this occurs, skip to Step 11.

9. If the current outlet temperature is below the new MRHL set point, locate the pinhole (SERVICE button) below the RESET button on the display board. Insert a thin probe (such as a paper clip) into the hole and press the button continuously for five (5) seconds to place the boiler into Service Mode. In Service Mode, the boiler will fire at ignition speed and will then modulate up to full fire.

10. Once the outlet temperature rises up to the MRHL set point, the MRHL will function, causing the boiler to shut down and lock out.

11. Repeat Steps 2, 3 and 4.

12. Set the MRHL to the appropriate set point by turning the NAVIGATION dial clockwise.

13. Repeat Steps 6 and 7.

14. Press the RESET button to clear the lockout.

15. If needed, press the RIGHT SELECT [STOP] key to exit Service Mode.

Low water cutoff protection

1. The SMART SYSTEM control module uses temperature sensing of both supply and return areas of the heat exchanger. If the flow rate is too low or the outlet temperature too high, the control module modulates and shuts the boiler down. This ensures boiler shutdown in the event of low water or low flow conditions.

2. Some codes and jurisdiction may accept these integral features of the control in lieu of requiring an additional limit control or low water cutoff. Consult local jurisdiction to determine. A low water cutoff is available from the factory (WTR20009).

Please note that the brackets ([]) denote screen status.

Page 65

11 Operating information (continued)

Installation & Operation Manual

Outdoor reset operation

Target temperature with outdoor reset

This feature improves the system's efficiency by decreasing set point as the outdoor temperature increases. Energy Efficiency Standards require the use of a control that automatically adjusts set point in relation to heat demand. In the absence of an external energy management system, this feature MUST BE used.

See the Knight Boiler Service Manual to change the settings.

Reset curve

The reset curve looks at outdoor air temperature and adjusts the set point in relation to heat demand.

Cascade

When multiple boilers are installed, they can be wired together in a cascade sequence. A maximum of eight boilers can be controlled from a single control. In this application one boiler would be designated as the Leader control and all others would be designated as Member controls. The Leader control can be programmed to use Lead/Lag or Efficiency Optimization control methods.

Once the Leader boiler receives a call for heat from a room thermostat, BMS, or Modbus, the control will determine what the set point will be. If outdoor air reset is desired, connect the outdoor air sensor to the terminals on the Low Voltage Connection Board on the Leader boiler. The set point will be calculated based on the programmed reset curve parameters. See the Knight Boiler Service Manual to program the reset curve. If outdoor air reset is not desired, do not connect the outdoor air sensor. A fixed temperature set point can be programmed into the control. See page 60 of this manual to program the set point.

If the water temperature at the system supply sensor is less than the set point + the turn-off offset - the off-on differential, then the control will initiate a call for heat on the Cascade (see the Knight Boiler Service Manual for an explanation of the offset and differential). The Leader will energize the lead boiler on the Cascade. For a new startup this will be the Leader boiler.

Sequence of the cascade

To equalize the run time of all boilers on the Cascade, the firing sequence will automatically be changed at set intervals.

During the first 24 hours of operation, the sequence will change every hour. After that, the sequence will change every 24 hours. The switching on/off sequence will be as follows:

TIME SWITCHING ON SEQUENCE

Start L-M1-M2-M3-M4-M5-M6-M7

1 hour M1-M2-M3-M4-M5-M6-M7-L

2 hours M2-M3-M4-M5-M6-M7-L-M1

If a boiler locks out or is used to heat an indirect DHW tank, it will automatically be given the lowest priority for the rest of that 24 hour period.

DHW, Night Setback, and Ramp Delay operation with cascade

For Normal Mode DHW operation any boiler(s) in the Cascade can be selected to provide heat for a DHW call. Select a boiler to be designated as the DHW boiler. Connect the DHW thermostat or sensor to the terminals on the Low Voltage Connection Board marked for the corresponding device. When the boiler receives a DHW call, the Leader control will take that boiler out of the Cascade sequence. If another boiler is available, the Leader will start it up to take its place.

The DHW boiler will adjust its set point to the programmed DHW boiler set point and will adjust its firing rate to maintain this. Once the DHW call has been satisfied, the Leader control will place that boiler back into the Cascade sequence.

Switching of the boiler between DHW operation and SH operation when there is a call for both does not occur in Cascade Mode.

When DHW is programmed for Zone Mode, connect the DHW thermostat or tank sensor to the Leader boiler. When a DHW call is received, the Leader will modulate the entire Cascade to bring the system supply temperature up to the DHW boiler set point.

Night Setback operation of the boilers within the Cascade is available. Programming of the Night Setback will be done through the Leader boiler. Refer to the Knight Boiler Service Manual for information regarding Night Setback.

Ramp Delay operation of the boilers as described in the Knight Boiler Service Manual is available when the boilers are part of a Cascade system.

Page 66

11 Operating information

Sequence of operation

OPERATION DISPLAY

1. Upon a call for heat, the gas pressure switch(es) must be closed.

2. Once the gas pressure switch(es) are closed, the control turns on the appropriate pumps (system and boiler pumps for space heating, DHW pump for DHW). The flow switch and/or LWCO must close.

Installation & Operation Manual

3. The control turns on power to the louver relay. The louver proving switch, air pressure switch, and blocked drain switch must close.

4. The control starts the prepurge cycle by initiating the blower.

5. The control starts the trial for ignition by firing the spark electrode and opening the gas valve.

6. If flame is not detected after the sparking ends, the control will perform a post-purge, then start another prepurge cycle and try to light the burner again. The control will perform a total of 4 attempts before locking out.

7. If flame is detected, it holds the firing rate steady for a few seconds to let the flame stabilize, then it begins to modulate the firing rate based on a set point or some other command (such as a 0-10V BMS signal).

Page 67

11 Operating information (continued)

Sequence of operation (continued)

OPERATION DISPLAY

8. If the space heating call for heat is active, and the tank thermostat or sensor starts a DHW call for heat, the boiler will switch to the DHW mode. If programmed for normal DHW operation (not as a zone), the DHW pump will turn on first, then the boiler pump will turn off 2 seconds later. This will divert the boiler’s outlet water from the heating system and send it to the tank coil instead. The control will then modulate to maintain the outlet temperature to the DHW boiler set point.

9. If the boiler is not part of a Cascade, and both the space heating and DHW calls for heat remain active long enough, the boiler will switch back and forth between the two heating modes until one of them is satisfied.

Installation & Operation Manual

10. Once both calls for heat are satisfied, the control will turn off the burner. The blower will continue to run during the postpurge period.

11. Any pumps that are running will continue to run for their respective

pump delay times before turning off, unless programmed to remain on continuously. A 60 second anti-cycle period will start, which will delay any new call for heat until it times out.

12. In Standby, ready to start a new cycle.

Page 68

Installation & Operation Manual

11 Operating information

Knight boiler control module

Use the control panel (FIG. 11-1) to set temperatures, operating conditions, and monitor boiler operation.

Figure 11-1 Control Panel

NAVIGATION DIAL

The information on the bottom of the display shows the functions of the two SELECT keys (on either corner), and the NAVIGATION dial (in the center):

MENU = Left SELECT Key SETPOINTS = NAVIGATION Dial - Pressing Down SHDN = Right SELECT Key

Page 69

11 Operating information (continued)

Access modes

User

The user can adjust space heating and tank target temperatures by pressing the NAVIGATION dial when “SETPOINTS” is flashing at the bottom of the display. The date and time, and the temperature units can also be changed (see page 61).

Installer

Most parameters are available only to the installer, accessible by entering the installer password, see the Knight Boiler Service Manual.

Saving parameters (reference the Parameter Table in the

Knight Boiler Service Manual)

Installation & Operation Manual

NOTICE

To save parameters and exit programming:

Press the RIGHT SELECT [SAVE] key and then press the RIGHT SELECT [HOME] key.

To enter a parameter and continue programming:

Press the RIGHT SELECT [SAVE] key 1 time to return to the parameter listings; press again to return to the menu listings. Remember to press the RIGHT SELECT [HOME] key when finished programming in order to save the changes made.

See the Knight Boiler Service Manual for a detailed description of parameters and access modes.

Please note that the brackets ([]) denote screen status.

Page 70

11 Operating information

Figure 11-2 Status Display Screen

Installation & Operation Manual

(BOILER

STATUS)

(OPERATIONAL INFORMATION)

(LEFT SELECT

KEY)

(NAVIGATION DIAL)

Status Display Screens

Section Display Description

STANDBY

START The unit has begun a burn cycle and is checking all safety circuits.

PREPURGE The unit has initiated a prepurge period on a call for heat.

The unit has not received a call for heat from a remote thermostat nor has it received a call for heat from a DHW thermostat.

(CALL FOR

HEAT)

(RIGHT SELECT KEY)

(Boiler Status

Bar)

(Call for Heat

Indicators)

IGNITION The unit has begun a spark period to ignite the main burner.

The unit has fired and is running at the displayed percentage.

POSTPURGE

SHUTDOWN The unit has been placed in the OFF position.

BLOCKED

The call for heat has been satisfied and the unit runs the fan for an additional postpurge period to clear the combustion chamber and vent system of residual flue products.

The controlled temperature has exceeded its set point and its offset.

The unit has detected a condition that has temporarily interrupted the current call for heat.

Heat/Loop Demand 1 has a call for heat.

Heat/Loop Demand 2 has a call for heat.

Heat/Loop Demand 3 has a call for heat.

The tank thermostat or sensor has a call for heat.

Indicates which rHeat/Loop Demand has priority.

The unit is being controlled by a 0 - 10V BMS signal.

The unit is supplying heat while in Cascade Mode.

Page 71

11 Operating information (continued)

Status Display Screens (cont’d)

Section Display Description

SYSTEM: The temperature read by the system supply sensor (if connected).

TANK: The temperature read by the tank sensor (if connected).

OUTDOOR: The temperature read by the outdoor sensor (if connected).

INLET TEMP: The temperature read at the inlet to the heat exchanger.

OUTLET TEMP: The temperature read at the outlet of the heat exchanger.

Installation & Operation Manual

(Operational

Information)

DELTA T:

FLUE TEMP: The temperature read by the flue sensor.

FLAME CURRENT: The current measured by the flame sense circuit.

FAN SPEED: The speed of the combustion blower.

BOILER PUMP: The status of the boiler pump output.

SYSTEM PUMP: The status of the system pump output.

DHW PUMP: The status of the DHW pump output.

BMS VOLTAGE: The voltage received from a BMS system.

BLR PUMP OUTPUT: The speed signal sent to a variable speed boiler pump in percent.

SYS PUMP INPUT: The speed signal received from a variable speed system pump control.

RATE OUTPUT: A 0 - 10V signal indicating the firing rate of the boiler.

SH RUN HOURS: The total hours of operation in the Space Heating Mode.

SH CYCLES: The total burner cycles in the Space Heating Mode.

The temperature difference between the inlet and the outlet of the heat exchanger.

DHW RUN HOURS: The total hours of operation in the DHW Mode.

DHW CYCLES: The total burner cycles in the DHW Mode.

LAST 10 FAULTS NO: The last 10 lockouts.

NIGHT SETBACK Shows the next Night Setback trigger (if active).

Page 72

11 Operating information

Status Display Screens (cont’d)

Section Display Description

EXIT Press the LEFT SELECT key to exit the current screen or setting.

Press and hold the LEFT SELECT key for 5 seconds to enter the Menu Screen.

Installation & Operation Manual

(LEFT SELECT

key function)

(NAVIGATION

Dial Function)

YES

LIMITS

HOME

SKIP

Press the LEFT SELECT key to confirm that the boiler needs to shutdown.

Press the LEFT SELECT key to enter the screen that allows you to adjust the limit settings.

Press the LEFT SELECT key to return to the Status Screen and upload parameter changes.

Press the LEFT SELECT key when in the Night Setback Screen to access the Night Setback Skip Screen.

Turning the NAVIGATION dial will select the next or previous Status Screen.

Pressing the NAVIGATION dial will show the next fault, NSB (Night Setback) trigger, or ramp delay setting.

Pressing the NAVIGATION dial will select the setting indicated by the cursor.

Pressing the NAVIGATION dial will display the Set Points Screen.

Turning the NAVIGATION dial will move the cursor up or down.

Turning the NAVIGATION dial will increase or decrease the current setting.

(RIGHT SELECT

key function)

SHDN Press the RIGHT SELECT key to turn the boiler OFF.

ON Press the RIGHT SELECT key to turn the boiler ON.

NO Press the RIGHT SELECT key to cancel the shutdown operation.

SAVE Press the RIGHT SELECT key to save the current change.

HOME

Press the RIGHT SELECT key to return to the Status Screen and upload parameter changes.

Page 73

12 Maintenance

Maintenance and annual startup

Table 12A Service and Maintenance Schedules

Installation & Operation Manual

Service technician

(see the following pages for instructions)

General:

• Address reported problems

• Inspect interior; clean and vacuum if necessary;

• Clean condensate trap and fill with fresh water

• Check for leaks (water, gas, flue, condensate)

• Verify flue and air lines in good condition and sealed tight

• Check system water pressure/system piping/expansion tank

• Check control settings

• Check ignition and flame sense electrodes (sand off any deposits; clean and reposition)

• Check wiring and connections

ANNUAL START-UP

• Perform start-up checkout and performance verification per Section 10 of this manual.

• Flame inspection (stable, uniform)

Owner maintenance

(see the Knight User’s Information Manual for

instructions)

• Check boiler area

• Check pressure / temperature

Daily

Monthly

Periodically

gauge

• Check vent piping

• Check air piping

• Check air and vent termination screens

• Check relief valve

• Check condensate drain system

• Check air vents

• Test low water cutoff (if used)

• Flame signal (at least 10 microamps at high fire)

• Clean the heat exchanger if flue temperature is more than 54°F above return water temperature.

If combustion or performance indicate need:

• Clean heat exchanger

• Remove and clean burner using compressed air only

• Clean the blower wheel

Every

6 months

End

of season

months

• Reset button (low water cutoff)

• Check boiler piping (gas and water) for leaks

• Operate relief valve

• Shut boiler down (unless boiler used for domestic hot water)

Page 74

12 Maintenance

Installation & Operation Manual

 WARNING

Follow the service and maintenance procedures given throughout this manual and in component literature shipped with the boiler. Failure to perform the service and maintenance could result in damage to the boiler or system. Failure to follow the directions in this manual and component literature could result in severe personal injury, death, or substantial property damage.

 WARNING

The boiler should be inspected annually only by a qualified service technician. In addition, the maintenance and care of the boiler designated in Table 12A and explained on the following pages must be performed to assure maximum boiler efficiency and reliability. Failure to service and maintain the boiler and system could result in equipment failure.

 WARNING

Electrical shock hazard – Turn off power to the boiler before any service operation on the boiler except as noted otherwise in this instruction manual. Failure to turn off electrical power could result in electrical shock, causing severe personal injury or death.

Address reported problems

1. Inspect any problems reported by the owner and correct before proceeding.

Inspect boiler area

1. Verify that boiler area is free of any combustible materials, gasoline and other flammable vapors and liquids.

2. Verify that air intake area is free of any of the contaminants listed in Section 1 of this manual. If any of these are present in the boiler intake air vicinity, they must be removed. If they cannot be removed, reinstall the air and vent lines per this manual and the Knight Boiler Service Manual.

Figure 12-1 Condensate Trap

RETAINING

SCREW

2” PVC CAP WITH

BLOCKED DRAIN SWITCH

PVC TEE ASSEMBLY

(FACTORY SUPPLIED)

Inspect boiler interior

1. Remove the front access cover and inspect the interior of the boiler.

2. Vacuum any sediment from inside the boiler and components. Remove any obstructions.

Clean condensate trap

1. Inspect the condensate drain line, condensate PVC fittings, and condensate trap.

2. Remove the PVC cap retaining screw from the PVC cap (FIG. 12-1).

3. Remove the 2 inch PVC cap with the switch located at the top of the trap (FIG. 12-1).

4. Remove any sediment in the trap.

5. Fill with fresh water until the water begins to pour out of the drain.

6. Replace the cap. Press the cap onto the trap until the cap makes contact with the drain.

7. Replace the retaining screw.

CONDENSATE FROM

HEAT EXCHANGER

 WARNING

The condensate trap must be filled with water during all times of boiler operation

TO FLOOR

DRAIN

to avoid flue gas emission from the condensate drain line. Failure to fill the trap could result in severe personal injury or death.

Check all piping for leaks

 WARNING

1. Inspect all water and gas piping and verify to be leak free.

2. Look for signs of leaking lines and correct any problems found.

3. Check gas line using the procedure found in Section 7

- Gas Connections.

Eliminate all system or boiler leaks. Continual fresh makeup water will reduce boiler life. Minerals can build up in sections, reducing heat transfer, overheating heat exchanger, and causing heat exchanger failure. Leaking water may also cause severe property damage.

Page 75

12 Maintenance (continued)

Installation & Operation Manual

Flue vent system and air piping

1. Visually inspect the entire flue gas venting system and air piping for blockage, deterioration or leakage. Repair any joints that show signs of leakage. Verify that air inlet pipe is connected and properly sealed.

2. Verify that boiler vent discharge and air intake are clean and free of obstructions.

 WARNING

Failure to inspect for the above conditions and have them repaired can result in severe personal injury or death.

Check water system

1. Verify all system components are correctly installed and

operational.

2. Check the cold fill pressure for the system. Verify it is

correct (must be a minimum of 12 psi).

3. Watch the system pressure as the boiler heats up (during

testing) to ensure pressure does not rise too high. Excessive pressure rise indicates expansion tank sizing or performance problem.

4. Inspect automatic air vents and air separators. Remove

air vent caps and briefly press push valve to flush vent. Replace caps. Make sure vents do not leak. Replace any leaking vents.

Check expansion tank

1. Expansion tanks provide space for water to move in

and out as the heating system water expands due to temperature increase or contracts as the water cools. Tanks may be open, closed or diaphragm or bladder type. See Section 6 - Hydronic Piping for suggested best location of expansion tanks and air eliminators.

 WARNING

Safety relief valves should be re-inspected AT LEAST ONCE EVERY THREE YEARS, by a licensed plumbing contractor or authorized inspection agency, to ensure that the product has not been affected by corrosive water conditions and to ensure that the valve and discharge line have not been altered or tampered with illegally. Certain naturally occurring conditions may corrode the valve or its components over time, rendering the valve inoperative. Such conditions are not detectable unless the valve and its components are physically removed and inspected. This inspection must only be conducted by a plumbing contractor or authorized inspection agency – not by the owner. Failure to re-inspect the boiler relief valve as directed could result in unsafe pressure buildup, which can result in severe personal injury, death, or substantial property damage.

Following installation, the valve lever must be operated AT LEAST ONCE A YEAR to ensure that waterways are clear. Certain naturally occurring mineral deposits may adhere to the valve, rendering it inoperative. When manually operating the lever, water will discharge and precautions must be taken to avoid contact with hot water and to avoid water damage. Before operating lever, check to see that a discharge line is connected to this valve directing the flow of hot water from the valve to a proper place of disposal. Otherwise severe personal injury may result. If no water flows, valve is inoperative. Shut down the boiler until a new relief valve has been installed.

Check boiler relief valve

1. Inspect the relief valve and lift the lever to verify flow.

Before operating any relief valve, ensure that it is piped with its discharge in a safe area to avoid severe scald potential. Read Section 6 - Hydronic Piping before proceeding further.

2. After following the above warning directions, if the relief valve weeps or will not seat properly, replace the relief valve. Ensure that the reason for relief valve weeping is the valve and not over-pressurization of the system due to expansion tank waterlogging or undersizing.

Page 76

12 Maintenance

Installation & Operation Manual

Inspect ignition and flame sense electrodes

1. Remove the ignition and flame sense electrodes from the boiler heat exchanger access cover.

2. Remove any deposits accumulated on the ignition/flame sense electrode using sandpaper. If the electrodes cannot be cleaned satisfactorily, replace with new ones.

3. Replace ignition/flame sense electrode, making sure gasket is in good condition and correctly positioned.

Check ignition ground wiring

1. Inspect boiler ground wire from the heat exchanger access cover to ground terminal strip.

2. Verify all wiring is in good condition and securely attached.

3. Check ground continuity of wiring using continuity meter.

Check burner flame

1. Inspect flame through observation window.

2. If the flame is unsatisfactory at either high fire or low fire, turn off boiler and allow boiler to cool down. Remove the burner and clean it thoroughly using a vacuum cleaner or compressed air. Do not use compressed air to clean burner if performed inside a building.

3. Remove the burner, reference FIG. 12-2 below.

4. When replacing the burner, ensure gasket is in good condition and positioned correctly (FIG. 12-2).

Figure 12-2 Burner Assembly

4. Replace ground wires if ground continuity is not satisfactory.

Check all boiler wiring

1. Inspect all boiler wiring, making sure wires are in good condition and securely attached.

Check control settings

1. Set the SMART SYSTEM control module display to Parameter Mode and check all settings. See Section 1 of Knight Boiler Service Manual. Adjust settings if necessary. See Section 1 of the Knight Boiler Service Manual for adjustment procedures.

2. Check settings of external limit controls (if any) and adjust if necessary.

Perform start-up and checks

1. Start boiler and perform checks and tests specified in

Section 10 - Start-up.

2. Verify cold fill pressure is correct and that operating

pressure does not go too high.

Check flame signal

1. At high fire the flame signal shown on the display should be at least 10 microamps.

2. A lower flame signal may indicate a fouled or damaged flame sense electrode. If cleaning the flame sense electrode does not improve, ground wiring is in good condition, and ground continuity is satisfactory, replace the flame sense electrode.

3. See Section 3 - Troubleshooting of the Knight Boiler Service Manual for other procedures to deal with low flame signal.

Page 77

12 Maintenance (continued)

Installation & Operation Manual

Review with owner

1. Review the Knight Boiler User’s Information Manual with the owner.

2. Emphasize the need to perform the maintenance schedule specified in the Knight Boiler User’s Information Manual (and in this manual as well).

3. Remind the owner of the need to call a licensed contractor should the boiler or system exhibit any unusual behavior.

4. Remind the owner to follow the proper shutdown procedure and to schedule an annual start-up at the beginning of the next heating season.

Cleaning boiler heat exchanger

For recommended materials; including brush, appropriate extension(s), refractory cover, and detailed instructions see Table 12B - Heat Exchanger Cleaning Kits.

1. Shut down boiler:

• Follow the “To Turn Off Gas to Appliance” instructions for the boiler in Section 10 - Startup.

• Do not drain the boiler unless it will be exposed to freezing temperatures. If using freeze prevention fluid in system, do not drain.

2. Allow time for the boiler to cool to room temperature if it has been firing.

3. Remove the nuts securing the heat exchanger access cover to the heat exchanger and set aside.

4. Remove the heat exchanger access cover, burner, and

gas/air arm assembly.

11. Close isolation valves on piping to isolate boiler from system. Attach a hose to the boiler drain and flush boiler thoroughly with clean water by using purging valves to allow water to flow through the water make-up line to the boiler.

12. Perform start-up and check-out procedures in the Check Flame and Combustion - Section 10 - Startup on pages 58 and 60 of this manual.

13. Replace the access cover and restore boiler to operation.

Table 12B Heat Exchanger Cleaning Kits

Model

106

151

286

 CAUTION

Kit

Number

KIT30062

KIT30063

* Do NOT use a metal brush. Only use the kit provided brush or an equivalent

Part

Number

CTN20005 Rear Refractory Cover

MSC20083* Nylon 4" Wheel Brush*

MSC20085 1/4" x 12” Drill Extension

CTN20005 Rear Refractory Cover

MSC20083* Nylon 4" Wheel Brush*

MSC20084 3mm Allen Wrench MSC20086 1/4" x 24" Drill Extension

Component

Description

replacement nylon brush.

Figure 12-3 Rope Gasket - Heat Exchanger Door

 WARNING

The boiler contains ceramic fiber materials. Use care when handling these materials per instructions in the Service Manual. Failure to comply could result in severe personal injury.

5. Remove the condensate hose from the heat exchanger end. Connect a field supplied 3/4" diameter hose to a drain pan. Using field supplied means, cover the refractory in the back of the combustion chamber of the heat exchanger.

6. Use a vacuum cleaner to remove any accumulation on the boiler heating surfaces. Do not use any solvent.

7. Brush the heat exchanger while dry using a nylon bristle brush. Caution: DO NOT use a metal brush. Re-vacuum the heat exchanger.

8. Finish cleaning using a clean cloth dampened with warm water. Rinse out debris with a low pressure water supply.

9. Allow the heat exchanger to thoroughly dry.

10. Remove the field supplied rear refractory cover from the back of the combustion chamber of the heat exchanger and reassemble.

ROPE GASKET

CAUTION: IF GASKET IS DAMAGED

DO NOT REUSE, THE HEAT EXCHANGER DOOR

MUST BE REPLACED.

NOTICE

Rope gasket is intended for sealing combustion (FIG. 12-3). If damaged DO NOT reuse, the heat exchanger door must be replaced. Consult factory for replacement heat exchanger door (kit WTR3080).

Oiled bearing circulators

1. The circulator shipped with the Knight boiler is waterlubricated. No oiling is required.

2. Check other circulators in the system. Oil any circulators requiring oil, following circulator manufacturer’s instructions. Over-oiling will damage the circulator.

3. Replace the boiler front access cover.

Page 78

13 Diagrams

Figure 13-1 Ladder Diagram

120VAC

TERMINAL STRIP 120V SUPPLY "L"

ON / OFF

KB ONLY

SWITCH

PC INTERFACE

BELL

ALARM

SWITCH

SILENCING

ALARM

CONTACTS

RUN-TIME

CONTACTS

SYSTEM SENSOR

OUTDOOR

SENSOR

TANK

SENSOR

SHIELD

CASCADE

SHIELD

BMS

SYS PUMP

BLR PUMP

OUT

RATE

OUT

SHIELD

MODBUS

SHIELD

X4-3

CN5-5

X1-6

0-10V

X5-9

3.5A

KB 801

ONLY

CONNECTION

JUNCTION BOX

INTEGRATED CONTROL

3.15A

SYSTEM PUMP

.8A

120 VAC

24 VAC

CN7-3

CN7-1

INLET

SENSOR

S1a

OPERATING

SENSOR

S1b

HIGH LIMIT

SENSOR

S3a

FLUE

SENSOR

S3b

FLUE

SENSOR

BOARD

21 22

CN8-1

CN8-2

CN8-3 X6-3

RELAY

BOILER PUMP

RELAY

DHW PUMP

RELAY

24V DC

SUPPLY

LWCO

24 VAC

HEAT/LOOP

THERMOSTAT

LOW GAS

PRESSURE

SWITCH

RIBBON CABLE

CN5-1

CN5-8

CN5-2

CN5-9

CN6

X6-1

X6-2

DEMAND

TANK

M O D B U S

X1-1

X5-1

HIGH GAS

PRESSURE

SWITCH

X5-6

X5-4

X5-12

X5-5

X5-13

X5-14

X4-7

X4-14

X4-6

X4-13

X4-1

X4-2

X4-3

SYSTEM

PUMP "L"

X1-2

BOILER

PUMP "L"

X1-4

DHW

PUMP "L"

X1-3

TERMINAL

STRIP

CONNECTION BOARD

CN7-4

CN7-2

INTEGRATED

CONTROL

X9-2

X9-1

X9-3

Installation & Operation Manual

TERMINAL STRIP 120V SUPPLY "N"

BLOCKED

DRAIN SWITCH

BLOWER

CN5-14 X4-8

CN5-10

CN5-7 X4-1

CN5-13

CN5-6

CN5-12

X4-11

CN5-11

CN5-3

CN5-4 X4-4

X5-2

X5-10

X5-11

X2-2

X2-1

TR2

X1-7

FLAME ROD

X4-12

X4-9

X4-2

X4-10

X4-5

X5-7

X5-16

X5-8

X5-15

GND

SYSTEM

PUMP "N"

GND

SYSTEM

PUMP

BOILER

PUMP "N"

GND

BOILER

PUMP

DHW

PUMP "N"

TERMINAL

STRIP

DHW

PUMP

FLOW

SWITCH

LOUVER

RELAY COIL

24VAC

LOUVER

PROVING SWITCH

KB 286 ONLY

O-TEMP HEX SW

AIR PRESSURE

SWITCH

GAS VALVE

BLOWER

SPARK

ROD

CAUTION HIGH VOLTAGE SPARK LEAD

NOTES:

1. Where possible, switches are shown wit hout utilities (gas, water or electricity) connected to the unit. As such, actual switch states may vary from those shown on diagrams depending upon whether utilities are connected or a fault condition is present.

2. See wiring diagram for additional notes.

GROUND

NEUTRAL

INTEGRATED

CONTROL

GAS VALVE

RELAY

BOX DEPICTS

OPTIONAL ITEMS

LOW VOLTAGE 120 VAC HIGH VOLTAGE

LADDER DIAGRAM

LBL20148 REV D

Page 79

13 Diagrams (continued)

Figure 13-2 Wiring Diagram

Installation & Operation Manual

CONNECTION BOARD

ALARM

CONTACTS

RUN-TIME

CONTACTS

24 VAC LOUVER

RELAY COIL

BELL JUMPER

ALARM BELL

SILENCING SWIT CH

Notes:

1. All wiring must be installed in accordance with: local, state,

2. If any original equipment wire as supplied with the appliance minimum of 105°C. Exceptions: Replacement high voltage spark lead or ribbon cables can lead to operational problems which could re

3. Actual connector block locations may vary from those shown on diagrams to troubleshoot unit.

LOUVER

PROVING SWITCH

GAS PRESSURE

SWITCH

FLOW

SWITCH

TANK THERMOSTAT HEAT/LOOP

DEMAND

HEAT/LOOP

DEMAND

HEAT/LOOP

DEMAND

SYSTEM SENSOR

OUTDOOR

SENSOR

TANK

SENSOR

SHIELD

CASCADE

SHIELD

BMS

SYS PUMP

BLR PUMP

CUT-OFF

GROUNDING

OUT

RATE

OUT

SHIELD

MODBUS

OPTION

SHIELD

LOW

WATER

SHIELD

JUMPER

3 2 1

0-10V

24 VAC

COM

1 2 3 4 5 6 7 8 9

11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44

CN7-1 CN7-2 CN7-3 CN7-4

MODBUS BOARD

X5-1 X5-2

MTR-01

provincial and national code requirements per either N.E.C. in USA or C.S.A. in Canada.

must be replaced, it must be replaced with wire having same wire gauge (AWG) and rated for a

sult in non-repairable damage to the integrated controller or o

diagrams. Refer to actual components for proper connector blo

LOW VOLTAGE 120 VAC HIGH VOLTAGE

INTEGRATED

CONTROL

X-7

CN5-1 CN5-8 CN5-2 CN5-9 CN5-3 CN5-10 CN5-11 CN5-4 CN5-5 CN5-14 CN5-12 CN5-6 CN5-13 CN5-7

CN6

CN8-1

CN8-2

CN8-3

X6-3

X6-2

X6-1

X6-4

X4-1 X4-2 X4-3 X4-4

X1-1 X1-2 X1-3

and ribbon cables must be purchased from the factory. Use

X4-7

X4-14

X4-6

X4-13

X4-5

X4-12

X4-11

X4-4

X4-3

X4-8

X4-10

X4-2

X4-9

X4-1

X9-1

X9-2 X9-3

X9-4

BOX DEPICTS

OPTIONAL ITEMS

BOX DEPICTS

DUAL SENSOR

SINGLE HOUSING

X1-3

X1-4

X1-2

X1-6

X1-5

X1-8

X1-1

X5-7

X5-16

X5-8

X5-15

X5-9

X5-1

X5-2

BLOCKED DRAIN SWITCH

X5-10

X5-11

O/BK

X5-4

R/BK

X5-12

X5-6

P/BK

X5-5

W/BK

X5-13

X5-14

X2-2

X2-1

X1-7

W/R

TR2

ther components.

JUNCTION

KB ONLY

ON/OFF SWITCH

2G3

L N

TRANSFORMER

BLOWER

1 2 3 4

AIR PRESSURE SWITCH

-T

OPERATING SENSOR S1a

-T

HIGH LIMIT SENSOR S1b

-T

INLET SENSOR S2

-T

FLUE SENSOR S3a

-T

FLUE SENSOR S3b

GAS VALVE @24VAC

FLAME SENSOR SPARK

ROD

HIGH VOLTAGE SPARK LEADCAUTION

of a non-approved spark lead

ck locations when using

BOX

KB 286 ONLY

O-TEMP HEX SW

BOX DEPICTS

OPTIONAL

ITEMS

120V

GND

SUPPLY

WIRING DIAGRAM

LBL20127 REV E

DHW PUMP

BOILER PUMP

SYSTEM PUMP

Page 80

Revision Notes: Revision A (ECO C05747) initial release. Reflects the

new model numbers for the Knight upgrade. Revision B (ECO #C06188) reflects updates made to the ladder and

wiring diagrams (ECO #C06158). Revision C (ECO #C06234) reflects changes made to the Service

Reminder feature. Revision D (ECO #C07981) reflects the layout in InDesign, edits made

to Section 11 - Operating Information, ECR04077 - combustible water pipes change from 1" to a 1/4", changes made to the vent pipe chart on page 17, ECR03743 - 20° rise notice on page 37, addition of O-temp switch.

Revision E (ECO #C09197) additional information added to the humidity warning on page 8, edits made to the O-Temp switch definition on page 4, along with updates made to the SMART SYSTEM control (ECR #R04523).

Revision F (ECO #C09803) reflects the addition of the new Polypropylene Vent material section, rearranging the vent section, and the addition of the AHRI and ASME logos (R05009).

Revision G (ECO #C10143) reflects updates made to the ignition timing information.

Revision H (ECO #C11102) reflects outdoor air reset updates along with revised product ratings on page 7 (ECR R05610).

Revision I (ECO #C11736) reflects changes made to the ratings page (page 7).

Revision J (ECO #C11821) reflects the sidewall vent kit changes.

KBII-I-O Rev J

12/12