Lochinvar 800 operation manual Optional room air, Removing from existing vent

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3General venting (continued)

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

Installation & Operation Manual

Vent and air piping

Vent and air system:

Table 3D Air Intake/Vent Piping Sizes

Model

Air Intake

Vent

 

 

 

399 - 600

4 inches (102 mm)

4 inches (102 mm)

 

 

 

700 - 800

4 inches (102 mm)

6 inches (152 mm)

NOTICE

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.

NOTICE

Increasing or decreasing combustion air

or vent piping is not authorized.

 

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

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

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

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

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

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

￿WARNING

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

for each 45° elbow.

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

NOTICE

The appliance output rating will reduce by

up to 1.5% for each 25 feet (68 m) of vent

 

Vent, air piping and termination:

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

Optional room air

length.

Table 3E Concentric Vent Kit Equivalent Vent Lengths

NOTICE

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

Model

Kit Number

Equivalent

Vent Length

 

 

399

CVK3007

5 Feet (1.5 m)

 

 

 

500

CVK3007

30 Feet (9 m)

 

 

 

600

CVK3007

30 Feet (9 m)

 

 

 

Removing from existing vent

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

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

The unit MUST be installed with the appropriate room air kit (Table 3F).

The equipment room MUST be provided with properly sized openings to assure adequate combustion air. Please refer to instructions provided with the room air kit.

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

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

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

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Contents Save this manual for future reference Models 399Contents Please read before proceeding When servicing boilerKnight XL How it works Model Air pressure switch Pump relay boardModels 600 Knight XL Boiler =B=R Rating RatingsCloset and alcove installations Installation must comply withDetermine boiler location Before locating the boiler, checkTOP For closet installations, Cpvc orProvide air openings to room Residential garage installationVent and air piping Flooring and foundationWhen using an existing vent system to install a new boiler Products to avoidAreas likely to have contaminants When removing a boiler from existing common vent system Remove boiler from wood pallet Prepare boilerModel Gas conversionsModels 600 Leveling the boilerGeneral venting Direct venting options Vertical Vent Requirements for installation in Canada Install vent and combustion air pipingInstalling vent or air piping General ventingPVC/CPVC air intake/vent connections Approved Stainless Steel Vent ManufacturersMake Stainless steel vent Air inlet pipe materialsStainless steel air intake/vent connections FasNSeal Saf-T VentRemoving from existing vent Optional room airAir contamination Model Description Kit NumberSidewall direct venting If using the alternate sidewall terminationVent/air termination sidewall Determine location3AClearance to Gravity Air Inlets Bird Screen Typical Prepare wall penetrationsPrepare wall penetrations Alternate Field Supplied Option Multiple vent/air terminationsTermination and fittings Description and usage Sidewall termination installation9Concentric Vent Dimensional Drawing Models 399 Multiventing sidewall terminations 11Concentric Vent Sidewall AttachmentVent/air termination vertical Vertical direct venting2Vertical Terminations with Multiple Boilers Prepare roof penetrations4Concentric Vertical Termination Vertical termination installationMm see -9, Multiventing vertical terminationsHydronic piping Hydronic piping Flow switch adjustment Near boiler piping connectionsCirculator sizing Pressure Head Feet20F 25F 30F 35F 399 500 600 700 800Near boiler piping components 7Single Boiler Primary/Secondary Piping Number of Units Model Manifold Pipe Sizes in Inches mm Gas connections Connecting gas supply pipingPropane Gas Natural gasCheck inlet gas supply Nominal Natural Gas Pipe Capacity ChartIron Pipe Length of Pipe in Straight FeetGas Pressure Gas valve replacementField wiring Installation must comply withLine voltage connections Auxiliary device proving switch Outdoor temperature sensorHigh gas pressure switch Low gas pressure switchWiring of the cascade Alarm contactsSystem supply sensor Boiler management system3Low Voltage Field Wiring Connections Condensate drain Condensate disposalStart-up Freeze protection when usedCheck/control water chemistry Fill and test water systemCheck thermostat circuits Check for gas leaksInspect/fill condensate system Inspect/check condensate lines and fittingsStart the boiler Final checks before starting the boilerIf boiler does not start correctly Check system and boilerFor Your Safety Read Before Operating Natural Gas Propane Set space heating operationSet domestic hot water DHW operation Configuration of the cascadeGeneral Operating informationProtection features Boiler temperature regulation Outdoor reset operation, if usedCascade Sequence of the cascade DHW, Night Setback, and Ramp Delay operation with CascadeBLR Ignition Sequence of operationShutdown Knight XL control moduleInstaller Access modesUser To save parameters and exit programmingStandby ServiceSet Point Met PrepurgeControl will display the actual fan motor RPM SYS ***.*F10V in **.Vdc DelayOperation of the cascade Maintenance Maintenance and annual startup Service technicianOwner maintenance Address reported problems MaintenanceClean condensate trap Check all piping for leaks Inspect boiler areaCheck water system Flue vent system and air pipingCheck expansion tank Check boiler relief valveCheck all boiler wiring Check ignition ground wiringCheck control settings Inspect ignition and flame sense electrodesCheck flame signal Cleaning boiler heat exchangerReview with owner High Voltage Diagrams2Ladder Diagram Page

800 specifications

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