Lochinvar 502, 2072 operation manual Alarm contacts, Wiring of the cascade

Page 44

5 Electrical connections

Alarm contacts

The SMART SYSTEM control closes another set of contacts whenever the heater is locked out or the power is turned off. This can be used to turn on an alarm, or signal a Building Management System that the pool heater is down.

Wiring of the cascade

When wiring the heaters for Cascade operation, select one heater as the Leader. The remaining heaters will be designated as Members. See page 48, Configuration of the Cascade for a detailed explanation of this procedure.

The return sensor of the Leader heater should be placed in the main system piping loop, upstream of the water being supplied to all the heaters (see FIG.’s 4-5, 4-6, and 4-7). The return sensors on the remaining Member heaters may also be placed in the same location as the Leader or they can be placed in each Member’s PVC piping loop in the Alternate sensor location, using the tapped sensor hole (FIG. 4-3). Should the Leader heater ever need to be replaced with one of the Member heaters in the Cascade, that Member’s sensor should be relocated to the previous lead heater’s supply sensor location for optimum operation of the cascaded units.

The supply/limit sensors of all cascaded heaters MUST be placed downstream, in the main system piping loop in the blended water, going out to the pool (FIG.’s 4-5, 4-6, and 4-7). The supply/limit sensor also serves as a high temperature limit for pool supply water and failure to locate all sensors in the blended water going out to the pool could result in higher temperature water than desired being discharged to the pool.

If an external thermostat or BMS is being used to enable or disable the cascaded heaters, the external thermostat or BMS should be connected to the Leader heater’s S1 input, located on the low voltage terminal board (see FIG. 5-5). Jumpers on all Member heaters should be left in place.

Communication between the Leader and the Member heaters is accomplished by using shielded, 2-wire twisted pair communication cable. Connect one of the twisted pair wires to terminal A on each of the low voltage connection boards, and the other wire of the twisted pair to terminal B on each of the low voltage connection boards. Connect the shield wire to the shield ground terminal on all of the heaters. If more than two heaters are on the Cascade, daisy chain the wiring from the Cascade terminals on the second heater to the Cascade terminals on the third heater, then from the third to the forth, and so on. The connections can be made in any order, regardless of the addresses of the heaters. Try to keep each cable as short as possible.

Installation & Operation Manual

Figure 5-5_Low Voltage Field Wiring Connections

TO MONITORING DEVICE

 

1

ALARM

 

 

 

2

CONTACTS

 

 

 

 

 

TO MONITORING DEVICE

 

3

RUN-TIME

 

 

4

CONTACTS

 

 

 

 

 

 

 

 

5

OPEN

WAY-3

VALVE

THREE WAY

 

 

6

CLOSE

VALVE

 

 

7

COM

 

 

 

 

REMOTE

 

 

 

 

8

S1

 

 

 

THERMOSTAT

9

S1

 

 

 

 

/EMS

 

 

 

 

10

S2

 

 

 

 

N/A

STAGING

 

 

11

S2

 

 

 

 

 

 

 

 

 

 

 

N/A

12

S3

 

 

LOUVER

 

13

S3

 

 

 

 

 

 

PROVING

 

N/A

14

S4

 

 

SWITCH

 

15

S4

 

 

 

 

 

16

LOUVER

 

 

 

 

17

PROVING SW

 

LINE

 

 

18

LOUVER

 

TO LOUVER

 

 

19

RELAY COIL

 

 

LOUVER RELAY

 

20

TANK

 

 

 

 

21

AQUASTAT

 

 

24VAC COIL

 

 

CN3

 

 

 

FIELD PROVIDED

 

 

 

 

 

 

 

 

 

 

 

 

 

22

TANK

 

 

FROM

 

 

23

SENSOR

 

A

 

24

SHIELD

CASCADE

TO NEXT

 

 

 

PREVIOUS

 

 

25

A

 

 

HEATER

B

 

 

 

 

A

 

26

B

 

 

HEATER

B

 

27

SHIELD

 

 

 

 

 

 

 

 

 

28

+ 0-10V

 

 

 

 

 

29

- BMS IN

 

 

 

 

30

+ 0-10V

 

 

 

 

OPTIONAL MODBUS

31

- RATE OUT

 

EXTERNAL

 

32

SHIELD

 

 

A

 

MODBUS

AUTOMATIC

 

 

 

SEQUENCER/

 

 

33

A

 

 

BUILDING

SHIELD

OPTIONAL MODBUS

34

B

 

 

 

 

 

 

 

CONTROL

B

 

35

SHIELD

 

 

 

 

SHIELD

 

CN2

 

 

 

 

 

 

 

 

 

TO NEXT BOILER

A

 

 

 

 

 

 

B

 

 

 

 

 

 

BK

1

 

 

A

POOL SAFETY

 

G

2

20K

POOL

REV

 

 

LBL20186

SUPPLY

 

R

3

 

SENSOR

 

 

 

 

SUPPLY

 

10K/20K

 

W

4

10K

 

 

 

 

 

POOL

 

 

10K

 

5

 

 

POOL/BOILER

 

10K

RETURN

 

 

6

 

 

 

 

 

SENSOR

 

 

 

 

7

 

NOT

 

 

 

 

8

 

USED

 

 

 

 

 

 

 

 

 

 

 

CN2

 

 

44

Page 43 Page 45
Image 44
Page 43 Page 45
Contents Installation & Operation Manual Models 502 Save this manual for future referenceContents Removal of Combustion Chamber Lining or Base Panels Please read before proceedingSpecial instructions 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 VentingBarometric damper location General informationVenting support Conventional negative draft venting see Negative draftFlue outlet piping Common Venting SystemsInspection of a masonry chimney Masonry chimney installationsVertical vent termination clearances and location 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 inletClearances Vertical Rooftop Air InletCombined air inlet points 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 productsVertical DV venting termination Direct venting seeFlue outlet piping 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 cap kit Outdoor installation seeOutdoor vent/air inlet location 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 Outdoor operation 3-way valve cover Automatic bypass valve cover installationPumped Automatic Bypass 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 Sequence of the cascade DAY Switching on SequenceCascade 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 DemandOwner maintenance Maintenance Maintenance and annual startupService technician Maintenance Address reported problemsInspect appliance area Inspect appliance interiorCheck all wiring Check control settingsCheck relief valve Inspect/replace hot surface igniter Ignition system checkoutCheck flue gas passageways Inspect and clean burnerPerform start-up and checks Check burner flame Review with owner Oiled bearing circulatorsConnection diagram Digital HarnessController Ladder diagram LOW VoltageRuntime Contacts 2BOARDCONNECTION Outdoor S5SENSOR POOL2ND Page
Related manuals
Manual 44 pages 17.92 Kb Manual 16 pages 36.89 Kb

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.
Top Page Image Contents