Lochinvar 502, 2072 operation manual Sequence of operation

Page 52

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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Contents Installation & Operation Manual Models 502 Save this manual for future referenceContents Special instructions Please read before proceedingRemoval of Combustion Chamber Lining or Base Panels Safety information Owner warningCopper-fin2- How it works Copper-fin2- How it works Copper-fin2- How it works Specifications RatingsDetermine unit location Location of unitIndoor clearances from combustible construction Freeze protectionOutdoor pool heater installation LocationHydronic systems anti-freeze Combustion and ventilation airOutside Combustion Air Using Direct Venting Minimum Recommended Combustion AIR Supply to Equipment RoomExhaust fans Combustion air filterVenting Identify your appliance’s vent systemCAT IV Flue pipe materials CAT I Negative pressure non-condensingVent system options Draft VentingVenting support General informationBarometric damper location Conventional negative draft venting see Negative draftFlue outlet piping Common Venting SystemsVertical vent termination clearances and location Masonry chimney installationsInspection of a masonry chimney 1Vent Termination from Peaked Roof 10 ft. or Less From Ridge Vertical DirectAire venting see Combustion air inlet pipingLength of air inlet pipe Sidewall air inletCombined air inlet points Vertical Rooftop Air InletClearances Venting of flue products Directaire Kits Model Horizontal KIT Vertical KITSidewall venting see Sidewall with fanSidewall venting termination Sidewall vent termination clearances and locationDrain tee installation Sidewall venting without fanModels 502 Horizontal DirectAire venting Powered Venting see Venting of flue productsFlue outlet piping Direct venting seeVertical DV venting termination Masonry chimney installation Horizontal DV venting terminationHorizontal Vent Termination Clearances and Location Combustion air inlet pipingConnecting the air inlet pipe to the unit Air inlet piping materialsLength of air inlet pipe Sealing PVC, CPVC, ABS, dryer vent, and flex duct vent pipeMultiple sidewall direct vent installations Vertical and sidewall combustion air inletHorizontal combustion air inlet clearances Vertical Combustion Air Inlet ClearancesOutdoor vent/air inlet location Outdoor installation seeOutdoor vent cap kit Connecting to gas supply Gas connectionsGas connection Gas pressure testSuggested GAS Pipe Size for Single Unit Installations Model Combination gas valvesGas train and controls Venting of combination gas valvesGAS Piping Size Chart Checking gas supply pressureWater connections Circulating pump502 752 Models 992 1442 ModelsHeat exchanger Initial set-up of maximum water flowMinimum Pump Performance Auxiliary Mixed Water Limit Control3Heater Within 15 feet of Pool Piping 6Cascaded Heaters Beyond 15 feet of Pool Piping Pool Return Sensor Location MIN Primary Pumped Automatic Bypass Automatic bypass valve cover installationOutdoor operation 3-way valve cover Water flow switch Pump purge delayPump purge pre-running delay Relief valveWay automatic bypass valve wiring Way Automatic Bypass Valve WiringRemote Wire Connection Electrical connectionsInstallation must comply with Pool heater operating control moduleLine voltage connections AMP Draw DataLouver proving switch Pool return sensor 2-wirePool supply/limit sensor 4-wire Low voltage connectionsAlarm contacts Wiring of the cascadePre-start checklist StartupStarting the filter system Check for gas leaksCheck thermostat circuits Check vent and air pipingPlacing the pool heater in operation Start the pool heater2Operating Instructions Configuration of the cascade Set clockOperating information GeneralPool heater temperature regulation Cascade DAY Switching on SequenceSequence of the cascade Sequence of operation MENU/EXIT Display Screen ENTER/RESET Updown Copper-fin2control moduleAccess modes InstallerUser To save parameters and exit programmingStatus display screens Unit Pump Delay Sysrtn OpenSysrtn Shorted STG DemandService technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Address reported problemsInspect appliance area Inspect appliance interiorCheck all wiring Check control settingsCheck relief valve Inspect/replace hot surface igniter Ignition system checkoutPerform start-up and checks Check burner flame Inspect and clean burnerCheck flue gas passageways Review with owner Oiled bearing circulatorsConnection diagram Digital HarnessController Ladder diagram LOW VoltageRuntime Contacts 2BOARDCONNECTION Outdoor S5SENSOR POOL2ND Page
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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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