Lochinvar 402 - 2072 Pump operation, Heat exchanger, Minimum Pump Performance, Ft. Hd

Page 68

8 Domestic water heaters

TABLE 8C

COMMON WATER MANIFOLD SIZE FOR

MULTIPLE WATER HEATER INSTALLATIONS

Pipe sizing chart provides minimum pipe size for common manifold piping to ensure adequate flow.

 

Common Manifold Size (Min.)

Number of Water Heaters

 

Models

402 - 752

 

992 - 2072

 

 

 

 

 

 

1

2"

 

2 1/2"

 

 

 

 

2

3"

 

4"

 

 

 

 

3

3 1/2"

 

5"

4

4"

 

6"

 

 

 

 

5

5"

 

6"

 

 

 

 

6

5"

 

6"

 

 

 

 

7

6"

 

7"

8

6"

 

7"

Pump operation

1.The water heater must have a properly sized circulating pump. This pump is sized to circulate water between the heater and the storage tank only.

2.The pump is sized to the heater input and water chemistry specifications noted in the Water Chemistry section on page 63.

3.The diameter and length of the piping installed between the storage tank(s) and water heater must be properly sized based on the capacity of the circulating pump.

4.The pump must run continuously when the water heater is energized. This is the standard operating system for a water heater.

A pump delay control function with an all bronze pump is installed as standard equipment on all water heater systems. The pump will operate only while there is a “Call for Heat” and for a timed period after the water temperature set point is satisfied to remove any residual heat from the combustion chamber.

5.Lubricate pump to manufacturer’s recommendations. Pump damage due to inadequate lubrication is non-warrantable.

The tank sensor must be installed in the tapping provided in the lower 25% of the storage tank to achieve proper operation. As shipped from the factory, the tank sensor is in the literature package shipped with the unit. Placing the sensor in the tapping provided on the storage tank will improve temperature response and prevent short cycles of operation.

68

Installation & Operation Manual

The standard circulating pump on this water heater is sized based on installation of a single storage tank and heater in close proximity. If the number of fittings and straight pipe exceeds the specified maximum equivalent number of straight feet for a specified diameter of pipe, non-warrantable operational problems may be experienced.

402 - 752 Models

1/4 HP, 120 VAC, 5.8 Amps

992 - 2072 Models

1/2 HP, 120 VAC, 7.4 Amps

The standard pump selection is based on the following pipe and fittings from the water heater to the storage tank:

6

- 90° elbows

2

- ball valves

2

- unions

1

- cold water tee

Not more than 45 feet of straight pipe.

For every elbow and tee in excess of those shown above, DEDUCT 6.5 FEET from the maximum allowable straight pipe in the heater to tank circulating loop.

TABLE D

MINIMUM PUMP PERFORMANCE

Based on heating potable water with a hardness of 5 to 25 grains per gallon and total dissolved solids not exceeding 350 ppm. See Water Chemistry section on page 63.

Model

 

GPM

Ft. Hd.

402 - 502 - 652 - 752

55

10

992 - 1262 - 1442 -

1802 - 2072

90

15

When installing multiple water heaters and/or multiple storage tanks, the diameter of the inter-connecting pipe and all fittings must be increased. An increase in pipe diameter will decrease head loss in the system piping and ensure proper flow. Proper pipe size between the heater and storage tank MUST be maintained to ensure that the standard pump supplied on the water heater will maintain desired flow.

When DHW Night Setback is enabled, the system pump output can be used to control a building circulation pump. The pump output will be on during the time Night Setback is not active and will be off when Night Setback is active. A field installed contactor must be used when controlling a circulation pump larger than 1/6 HP.

Heat exchanger

This is a highly sophisticated heat exchanger designed to carry water in such a way that it generates a scouring action which keeps all interior surfaces free from build-up of impurities. The straight-line, two pass design of the copper finned tubes send water into the headers at a properly rated velocity. The configuration of the headers, in turn, creates a high degree of turbulence which is sufficient to keep all contaminants in suspension. This “scouring action” provides greater cost savings for owners. Tubes are always able to transfer heat at peak efficiency. Every surface within this water containing section is of a non-ferrous material, providing clear, clean, rust- free hot water. Straight copper tubes-finned on the outside for maximum heat transfer and glass lined, cast iron, one piece, cored headers make up an entirely rust-proof unit. On all models, header inspection plugs in the heat exchanger can be removed for field inspection and cleaning of copper tubes. The heat exchanger may be removed from the unit.

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Contents Models 402 Save this manual for future referenceContents Removal of Combustion Chamber Lining or Base Panels Please read before proceedingSpecial instructions Safety information Owner warningCopper-fin II How it works Copper-fin II How it works Copper-fin II How it works Ratings Copper-fin =B=R RatingDetermine unit location Location of unitIndoor clearances from combustible construction Freeze protectionOutdoor boiler 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-condensingDirect Vent see Barometric 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 402 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 pressure test Gas connectionVenting of combination gas valves Combination gas valvesGas train and controls GAS Piping Size Chart Checking gas supply pressureWater flow switch Water connectionsInlet and outlet connections Heat exchangerHeating boiler installations Relief valvePiping of the boiler system Water connections heating boilers onlyMinimum boiler water temperatures Low Temperature Return Water SystemsLow temperature bypass requirements LTV Valve Kits Model LTV Valve KITLow system water volume Three way valves in systemRadiant floor and snow melt heating systems Maximum Flow for Heating BoilerTemperature / pressure gauge Typical heating boiler installationsInstallation with a chilled water system DHW installationGPM Diameter4Primary/Secondary Piping of Multiple Boilers Floor Drain Heating Supply Loop 6Primary/Secondary Piping with Buffer Tank Installation must comply with Electrical connectionsBoiler operating control module AMP Draw DataLine voltage connections EMS or remote thermostat connectionLow voltage connections DHW Domestic Hot Water thermostatLouver proving switch Alarm contactsLouver relay System supply sensor recommended useWiring of the cascade 4Low Voltage Field Wiring ConnectionsStart-up Check thermostat circuits Check vent and air pipingPlacing the boiler in operation Start the boiler1Lighting Instructions Set clock Configuration of the cascadeSet DHW operation Operating information GeneralHow the appliance operates How the control module operatesTemperature control Protection featuresCascade Boiler temperature regulationOutdoor reset operation, if used boilers only Sequence of the cascade DHW, Night Setback, and Ramp Delay operation with cascadeDAY Switching on Sequence Sequence of operation Operation DisplayMENU/EXIT Display Screen ENTER/RESET Updown Copper-fin II control moduleAccess modes InstallerUser To save parameters and exit programmingStatus display screens Inlet ***F Inlet OpenInlet Shorted Syssup ***FUnit Pump Delay DHW Pump DelaySTG Demand FAN SpeedOperation of the cascade MIX VAL POS ** %Temperature Rise AT Full Rate Fire 90 GPM Flow Model Temperature Rise FDomestic water heaters Maximum Water FlowWater chemistry 1Typical Water Heater Piping with Storage Tank 2Single Water Heater Piping with Two Storage Tanks 3Multiple Water Heater Piping with a Single Storage Tank 4Multiple Water Heater Piping with Multiple Storage Tanks Pump operation Heat exchangerMinimum Pump Performance Ft. HdDomestic water temperatures Thermostat adjustment procedureMinimum water temperatures domestic hot water use Optional relief valve Thermal expansionCathodic protection Location of Cold Water Supply Piping ConnectionsOwner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check all wiring Check control settingsCheck relief valve Inspect/replace hot surface igniter Ignition system checkoutInspect and clean burner Perform start-up and checksCheck burner flame Check flue gas passagewaysOiled bearing circulators Inspect and clean the heat exchangerReview with owner Connection diagram Digital HarnessSplay Diagram LadderFlow Switch
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402 - 2072 specifications

The Lochinvar 402 - 2072 is a versatile and highly efficient boiler designed to meet the heating demands of modern residential and commercial applications. This model stands out due to its innovative technologies, advanced features, and a high level of reliability, making it an ideal choice for consumers looking for an enduring and economical heating solution.

One of the primary characteristics of the Lochinvar 402 - 2072 is its impressive energy efficiency. With an exceptional annual fuel utilization efficiency (AFUE) rating, this boiler ensures minimal energy waste, allowing homeowners and business operators to save significantly on their energy bills. The model incorporates advanced condensing technology that enables it to extract heat from the combustion gases, maximizing heat transfer and reducing emissions.

The Lochinvar 402 - 2072 is built with a robust stainless steel construction that enhances durability and resilience against corrosion and other environmental factors. This material not only prolongs the lifespan of the unit but also contributes to its outstanding thermal efficiency. Additionally, the boiler's compact design allows for flexible installation options, making it suitable for various spaces, including tight utility rooms and basements.

Equipped with a user-friendly control interface, the Lochinvar 402 - 2072 allows for easy monitoring and adjustment of settings. Its advanced digital display provides real-time data on system performance, ensuring the operator can maintain optimal performance and efficiency.

Another noteworthy feature is the unit's quiet operation. The design includes sound-dampening insulation and high-efficiency circulators, keeping noise to a minimum, which is an essential trait for both residential and commercial settings.

The Lochinvar 402 - 2072 is also designed with safety in mind. It incorporates multiple safety features including an automated vent damper, low water cutoff, and a comprehensive control system that monitors various operating conditions. This proactive approach to safety ensures that potential issues are identified and addressed before they become critical.

In conclusion, the Lochinvar 402 - 2072 boiler presents an exceptional combination of efficiency, durability, and user-friendly features. Its advanced condensing technology, stainless steel construction, and focus on safety make it a leading choice in the competitive boiler market, catering to the heating needs of a diverse range of applications while ensuring environmental responsibility. For those in search of a dependable and efficient heating solution, the Lochinvar 402 - 2072 is certainly worth considering.
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