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

BOILER PUMP

 

HOT WATER

AIR COVER

 

GENERATOR

 

HEAT EXCHANGER 1

 

HOT WATER PUMP

 

 

51 GPM

102 GPM

102 GPM

HEAT EXCHANGER 2

51 GPM

 

HOT WATER PUMP

 

Figure 5-3Pump Configuration

FROM SYSTEM

FROM SYSTEM

TO BOILER

INLETS

TO BOILER

INLETS

OKNO

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Lochinvar 5 operation manual Hot Water Generator pump sizing, Example

5 specifications

Lochinvar 5 is a cutting-edge residential boiler designed to meet the heating needs of modern homes while ensuring high efficiency and user convenience. As one of the latest offerings from Lochinvar, a trusted name in the heating industry, the Lochinvar 5 combines advanced technology with robust features that make it a top choice for homeowners and contractors alike.

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The Lochinvar 5 employs a highly efficient modulating burner technology that optimizes fuel usage based on real-time heating demand. This ensures that the boiler operates at peak efficiency, providing consistent warmth without unnecessary energy waste. The inclusion of advanced controls further enhances its performance, allowing users to adjust settings easily and monitor usage through a user-friendly digital display.

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