Installation & Operation Manual

7 Operating information

Sequence of operation

 

OPERATION

 

 

DISPLAY

 

 

 

1.

The high limit may require reset through the display before HTR: Standby

78)

 

any action will take place.

OUT: 123.8F(

 

 

 

 

 

2.

Upon a call for heat the control turns on the unit pump. The

HTR:

Standby

78)

 

flow switch and low water cutoff (if equipped) must close.

OUT:

123.8F(

3.• If the unit is equipped with a proof of closure valve, the proof of closure switch must be closed. The proof of closure valve is then energized. The gas pressure switch(es) (if equipped) must close.

• If the contact for the louvers is closed, the louver proving

HTR:

Standby

inputs must close.

OUT:

123.8F( 78)

•If the air pressure switch is open, the prepurge cycle then begins by starting the combustion blower. Once started, the air pressure switch must close.

4.After the 15 second prepurge, the blower slows down and HTR: PREPURGE

the hot surface igniter (HSI) is energized. The HSI is heated OUT: 123.9F( 78) for at least 20 seconds.

5.Once the HSI is hot, the trial for ignition begins with the HTR: IGNITION

opening of the gas valve.

OUT: 123.9F(

78)

 

6. If the SMART SYSTEM control does not sense flame, then HTR: POSTPURGE, LOCKOUT

it will lock out.

OUT: 123.9F(

78)

7.If the SMART SYSTEM control senses flame, it will fire the burner to maintain the set point. The firing rate will stage as

required to hold the actual temperature at the set point. If the HTR: RUN STG: 1

pool heater lights due to a space heating call for heat, and the OUT: 124.8F( 78) ramp delay function is active (default is disabled), the staging

will be held to a series of increasing limits after the burner has lit.

8.Once a call for heat is satisfied, the control will turn

off the burner. The blower will remain on for the 30 second HTR: POSTPURGE

postpurge cycle. The pump will continue to run for the OUT: 127.4F( 78) respective pump delay times, then turn off.

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Lochinvar 502, 2072 operation manual Sequence of operation
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2072, 502 specifications

Lochinvar 2072,502 is an innovative and robust water-heating solution tailored for residential and commercial applications. This model represents a significant advancement in energy efficiency and performance, catering to the dynamic heating requirements of modern buildings.

One of the standout features of Lochinvar 2072,502 is its advanced thermal efficiency. With an impressive AFUE (Annual Fuel Utilization Efficiency) rating, the unit delivers exceptional heat output while minimizing energy consumption. This not only reduces utility bills for homeowners and businesses but also supports sustainability efforts by decreasing carbon footprints.

The Lochinvar 2072,502 incorporates cutting-edge technologies that set it apart in the market. It is equipped with advanced control systems that allow users to precisely manage heating outputs, ensuring optimal comfort while conserving energy. The user-friendly digital display provides real-time data, allowing for efficient monitoring and control.

Another significant characteristic of the Lochinvar 2072,502 is its robust stainless-steel construction. This feature enhances the unit's durability and longevity, ensuring reliable performance even in challenging conditions. The high-quality materials also contribute to maintaining consistent water temperatures, which is essential for both residential and commercial heating needs.

The Lochinvar 2072,502 operates silently, making it ideal for installations in areas where noise is a concern. Its compact design allows for flexible installation options, fitting seamlessly into various spaces, whether it’s a utility room, basement, or outdoor area.

Furthermore, the unit supports multiple venting options, accommodating different building architectures and layouts. This versatility makes it an ideal choice for new builds and retrofitting existing systems.

Maintenance is streamlined with the Lochinvar 2072,502, as it features a self-diagnostics system that simplifies troubleshooting. Regular service check-ups are made easier with accessible components, allowing technicians to perform maintenance tasks efficiently.

In summary, the Lochinvar 2072,502 stands out for its high efficiency, advanced technology, durability, and flexible installation options. It is an ideal choice for those seeking a reliable and technologically advanced water-heating solution that meets the challenges of contemporary heating demands while promoting energy savings and environmental responsibility.
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