Lochinvar 5 operation manual Hot Water Generator pump sizing, Example

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Installation & Operation Manual

5 Hydronic piping

Hot Water Generator pump sizing

The SYNC has two (2) heat exchangers that require two (2) individual pumps for proper installation in the boiler loop and an additional two (2) pumps for the Hot Water Generator loop.

Hot Water Pump Head Loss = Ft. of Head for Heat Exchanger 1 (at required flow) + Ft. of Head for the Hot Water Generator (at 2 X the flow of Heat Exchanger 1)

Example:

Boiler: SB1500

A ΔT of 30° requires a flow through each heat exchanger of 51 GPM. The heat exchanger head loss is 18 ft. of head (see Table 5A).

Coupled with a Lochinvar Hot Water Generator with a 8-42 (diameter-length) tube bundle the calculated pressure drop is 1.2 Ft. of Head at 102 GPM.

Hot Water Pump Head Loss = 18 Ft/Hd (51 GPM) + 1.2 Ft/Hd (102 GPM) = 19.2 Ft/Hd

A pump will need to be selected to flow 51 GPM with a head loss of 19.2 Ft/Hd.

Figure 5-2Boiler Schematic

	TO SYSTEM	FROM SYSTEM
	HEAT EXCHANGER 2	HEAT EXCHANGER 1
	BOILER PUMP	HEAT EXCHANGER 1
	BOILER PUMP	BOILER PUMP
		BOILER PUMP
	HOT WATER	AIR COVER
	HOT WATER
	GENERATOR
	HEAT EXCHANGER 1
	HOT WATER PUMP
		51 GPM
	102 GPM	102 GPM
	HEAT EXCHANGER 2	51 GPM
	HEAT EXCHANGER 2
	HOT WATER PUMP

Figure 5-3Pump Configuration

FROM SYSTEM

FROM SYSTEM

TO BOILER

INLETS

TO BOILER

INLETS

OKNO

30

Image 30

Contents Save this manual for future reference Contents When servicing boiler Please read before proceedingSync How it works BlowersModels 1.0 1.3 Ratings SyncDetermine boiler location Installation must comply withCloset and alcove installations Before locating the boiler, check1Closet Installation Minimum Required Clearances Provide air openings to room Prevent combustion air contaminationFlooring and foundation When 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 pallet5Combustion Air Through Ducts Minimum Recommended Combustion AIR Supply to Equipment Room General venting Direct venting options Sidewall VentDirect venting options Vertical Vent Install vent and combustion air piping Air intake/vent connectionsRequirements for installation in Canada SizingMaterials Air inlet pipe materialsOptional room air Vent fittings Material StandardVent pipe PrimerPolypropylene Centrotherm InnoFlue SW Duravent PolyproStainless steel vent Supplied with the vent systemSidewall direct venting Vent/air termination sidewallDetermine location 2B Alternate Clearance to Gravity Air Inlets Prepare wall penetrations Found in this manualPrepare wall penetrations Alternate Field Supplied Options Multiple vent/air terminationsVertical direct venting Vent/air termination verticalPrepare roof penetrations 3Vertical Terminations with Multiple Boilers Hydronic piping Near boiler piping connections Circulator sizingHot Water Generator pump sizing ExampleNear boiler piping components 5Single Boiler Primary/Secondary Piping Model Number of Units Manifold Pipe Sizes in Inches mm Connecting gas supply piping Gas connectionsNatural gas Propane GasGAS Piping Size Chart Check inlet gas supplyGas valve replacement Gas PressureField wiring Installation must comply withLine voltage connections Louver proving switch EnableOutdoor temperature sensor Flow switch field suppliedBoiler management system System supply sensor Wiring of the cascadeAlarm contacts Runtime contacts3Low Voltage Field Wiring Connections Condensate disposal Condensate drainCheck/control water chemistry Freeze protection when usedStart-up Fill and test water systemInspect/fill condensate system Check for gas leaksCheck thermostat circuits Inspect/check condensate lines and fittingsIf boiler does not start correctly Final checks before starting the boilerStart the boiler Check system and boilerFor Your Safety Read Before Operating Set space heating operation Natural Gas PropaneConfiguration of the cascade Set Hot Water Generator HW operationOperating information GeneralProtection features Boiler temperature regulation Outdoor reset operation, if usedCascade Sequence of the cascade HW operation with cascadeNight Setback operation with cascade Sequence of operation Sync control module 1Status ScreenOperating information 2Main Menu Screen Owner maintenance Maintenance Maintenance and annual startupService technician See the Sync User’s Information Manual for InstructionsMaintenance Check expansion tank Flue vent system and air pipingCheck water system Check boiler relief valveCheck control settings Check ignition ground wiringCheck all boiler wiring Check flame signalCleaning boiler heat exchanger Model Kit Part Component Number DescriptionHandling ceramic fiber materials Niosh stated First AidDiagrams LOW Voltage 120 VAC High Voltage2Ladder DiagramPart 3Wiring Diagram Page

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