Lochinvar WH 55-399 operation manual Gas connections, Connecting gas supply piping

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7 Gas connections

Connecting gas supply piping

1.Remove the front access panel and refer to FIG. 7-1 to pipe gas to the boiler.

a.Install a field supplied sediment trap / drip leg upstream of the boiler gas controls.

Figure 7-1Gas Supply Piping

MANUAL SHUTOFF VALVE
(FIELD SUPPLIED)	UNION

GAS SUPPLY

DRIP LEG

Installation & Operation Manual

2.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.

3.Purge all air from the gas supply piping.

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

a.Close manual main shutoff valve during any pressure testing at less than 13 inches w.c.

b.Disconnect the boiler and gas valve from the gas supply piping during any pressure testing greater than 13 inches w.c.

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.

5.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.

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Contents Models WH 55 Contents When servicing boiler Please read before proceedingBoiler operation Boiler waterKnight Wall Mount Boiler How it works Stainless steel heat exchangerModels 55 Ratings Knight Wall Mount Boiler Ahri RatingInstallation must comply with Closet and alcove installationsDetermine boiler location Before locating the boiler, check1Closet Installation Minimum Required Clearances Precautions Vent and air pipingWall mounting location Prevent combustion air contaminationWhen 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 Prepare boiler Remove boiler from wood palletGas conversions Mounting the boiler Mounting to a wood studded wallMounting to a concrete wall Mounting to a metal studded wallGeneral venting Direct venting options Sidewall VentInstall vent and combustion air piping Air intake/vent connectionsRequirements for installation in Canada SizingModel Kit Number Equivalent Vent Length Model Max Vent AirMaterials Air inlet pipe materialsOptional room air Air contaminationApproved PVC/CPVC Vent Pipe and Fittings Material StandardVent pipe Vent fittingsModel PolypropyleneCentrotherm InnoFlue SW Duravent Polypro Stainless steel vent If using the alternate sidewall termination Sidewall direct ventingVent/air termination sidewall Determine location2AClearance to Gravity Air Inlets Model Air Vent Centerline Width Prepare wall penetrationsPrepare wall penetrations Alternate Field Supplied Option Multiple vent/air terminationsSidewall termination installation Sidewall termination optional concentric ventDescription and usage 92 and 3 Concentric Vent Dimensional Drawing reference D on Sidewall termination optional concentric vent models12Concentric Vent Sidewall Attachment Multiventing sidewall terminationsVertical direct venting Vent/air termination verticalPrepare roof penetrations Vertical termination installation Vertical termination optional concentric ventMultiventing vertical terminations Minimum Combustion AIR TypicalAlternate vertical concentric venting Vent / Air Inlet Size Minimum Existing Vent / Chase SizeConcentric Venting Arrangement Existing vent as a chaseHydronic piping System water piping methods General piping informationLow water cutoff device Chilled water systemNear boiler piping components Near boiler piping connections Circulator sizing20F Temperature Rise Applications 25F Temperature Rise Applications35F Temperature Rise Applications Pump Size GrundfosSmart System / Multi-temperature loop control option Variable speed pump setupVariable speed pump option 3Single Boiler Primary / Secondary Piping Make UP Water Indirect Number of Units Boiler Member 8Single Boiler Multiple Temperature DHW Priority Model Required Pipe Sizes Boiler Make UP Boiler Connecting gas supply piping Gas connectionsNatural gas Propane GasNatural Gas Pipe Capacity Chart Check inlet gas supplyLength of Pipe in Straight Feet for 1/2 PSI Gas valve replacement Gas PressureField wiring Installation must comply with Low voltage connectionsLine voltage connections Outdoor temperature sensor Louver proving switchFlow switch ThermostatAlarm contacts Wiring of the cascadeSystem supply sensor Boiler management systemInstallation FieldwiringCondensate disposal Condensate drainFreeze protection when used Start-upCheck/control water chemistry Fill and test water systemClean/Inspect Trap Assembly Check for gas leaks Inspect/fill condensate systemCheck thermostat circuits Inspect/check condensate lines and fittingsFinal checks before starting the boiler Start the boilerIf boiler does not start correctly Check system and boiler2Operating Instructions Models 55 Operating Instructions Model Set space heating operation Natural Gas PropaneVerify DHW mode Configuration of the cascadeSet domestic hot water DHW operation Operating information GeneralProtection features Boiler temperature regulation Outdoor reset operation, if used CascadeSequence of operation Operation DisplayAccess modes InstallerUser Knight wall mount boiler control module 1Control PanelCall for Heat Information Dial Function Maintenance Maintenance and annual startup Service technicianOwner maintenance See the following pages for instructions GeneralMaintenance Check ignition ground wiring Check all boiler wiringCheck control settings Flue vent system and air pipingCheck flame signal Cleaning boiler heat exchangerPerform start-up and checks Check burner flameDiagrams PC Interface2Wiring Diagram