Lochinvar 402 - 2072 Boiler bypass requirements, Temperature / pressure gauge, DHW installation

Page 38

Installation & Service Manual

4 Water connections

TABLE - 4C

SYSTEM TEMPERATURE RISE CHART

Temperature Rise and Head Loss Based on Boiler Output in Btu/hr

Btu/hr

30°F ΔT

35°F ΔT

40°F ΔT

45°F ΔT

50°F ΔT

55°F ΔT

60°F ΔT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Input

Output

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

GPM

Ft/hd

399,999

339,999

23

1.1

19

0.7

--

--

--

--

--

--

--

--

--

--

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

500,000

425,000

28

1.6

24

1.2

21

0.7

19

0.7

--

--

--

--

--

--

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

650,000

552,500

37

3.0

31

2.2

28

1.6

24

1.2

22

0.9

20

0.7

18

0.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

750,000

637,500

42

4.1

36

2.8

32

2.3

28

1.6

25

1.3

23

1.1

21

0.7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

990,000

841,500

55

2.6

48

2.3

42

1.5

37

1.4

33

1.0

30

0.9

28

0.9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,260,000

1,071,000

71

4.4

61

3.6

53

2.7

48

2.3

42

1.7

39

1.5

35

1.2

1,440,000

1,224,000

81

6.3

70

5.0

61

3.8

54

2.7

48

2.3

44

2.0

40

1.8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1,800,000

1,530,000

102*

11.8

87

9.0

76

6.6

68

5.6

61

4.4

55

2.6

50

3.0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2,070,000

1,759,500

--

--

100*

10.1

87

9.0

78

7.6

70

6.2

64

5.4

58

4.6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*Cupro-Nickel Heat Exchanger Required at Flows Above 55 GPM on Models 402 - 752 and above 90 GPM on Models 992 - 2072.

TABLE - 4D

BOILER TEMPERATURE RISE AT MAXIMUM FLOW Temperature Rise at Full Rate Fire, 55 and 90 GPM Maximum Flow

Model

Temperature Rise °F

402

12 @ 55 GPM

502

15 @ 55 GPM

652

20 @ 55 GPM

752

23 @ 55 GPM

992

19 @ 90 GPM

1262

24 @ 90 GPM

 

 

1442

27 @ 90 GPM

1802

34 @ 90 GPM

2072

39 @ 90 GPM

Boiler bypass requirements

The installer must ensure that the boiler is supplied with adequate flow without excessive temperature rise. It is recommended that this boiler be installed with a bypass in the piping if the maximum recommended flow rate is exceeded. The bypass will help to ensure that the boiler can be supplied with adequate water flow. Flow rates exceeding the maximum recommended flow will result in erosion of the boiler tubes. A typical bypass with a valve as shown in FIG. 4-5 will allow control of boiler flow.

Temperature / pressure gauge

This boiler is equipped with a dial type temperature / pressure gauge. This gauge is factory installed in the outlet side of the boiler piping. The gauge has one scale to read system pressure and a separate scale to read water temperature in degrees Fahrenheit. The temperature / pressure gauge is provided to meet code requirements. Water temperatures can be more accurately monitored from the data provided in the digital display in the Operator Interface.

38

Typical heating boiler installations

General plumbing rules:

1.Check all local codes.

2.For serviceability of boiler, always install unions.

3.Always pipe pressure relief valve to an open drain.

4.Locate system air vents at highest point of system.

5.Expansion tank must be installed near the boiler and on the suction side of the system pump.

6.Support all water piping.

Installation with a chilled water system

Pipe refrigeration systems in parallel. Install duct coil downstream at cooling coil. Where the hot water heating boiler is connected to a heating coil located in the air handling units which may be exposed to refrigeration air circulation, the boiler piping system must be equipped with flow control valves or other automatic means to prevent gravity circulation of the boiler water during the cooling cycle.

The coil must be vented at the high point and hot water from the boiler must enter the coil at this point. Due to the fast heating capacity of the boiler, it is not necessary to provide a ductstat to delay circulator operation. Also, omit thermostat flow checks as the boiler is cold when heating thermostat is satisfied. This provides greater economy over maintaining standby heat.

DHW installation

Boilers may be utilized with a Hot Water Generator tank for domestic hot water. When used for DHW, either a tank thermostat or sensor must be installed in a bulbwell within the tank and connected back to the unit in order for the controller to regulate water temperature and a pump for DHW. Pumps used for DHW purposes should be sized to provide adequate flow to the boiler when in DHW Mode. Reference FIG. 4-3 shown with a Hot Water Generator for DHW on page 39 for a typical DHW piping scheme.

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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 RatingIndoor clearances from combustible construction Determine unit locationLocation of unit Freeze protectionHydronic systems anti-freeze Outdoor boiler installationLocation Combustion and ventilation airOutside Combustion Air Using Direct Venting Minimum Recommended Combustion AIR Supply to Equipment RoomExhaust fans Combustion air filterCAT IV Flue pipe materials VentingIdentify your appliance’s vent system CAT I Negative pressure non-condensingDirect Vent see Barometric damper location General informationVenting support Flue outlet piping Conventional negative draft venting seeNegative draft 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 Length of air inlet pipe Vertical DirectAire venting seeCombustion air inlet piping Sidewall air inletClearances Vertical Rooftop Air InletCombined air inlet points Venting of flue products Directaire Kits Model Horizontal KIT Vertical KITSidewall venting termination Sidewall venting seeSidewall with fan 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 Horizontal Vent Termination Clearances and Location Masonry chimney installationHorizontal DV venting termination Combustion air inlet pipingLength of air inlet pipe Connecting the air inlet pipe to the unitAir inlet piping materials Sealing PVC, CPVC, ABS, dryer vent, and flex duct vent pipeHorizontal combustion air inlet clearances Multiple sidewall direct vent installationsVertical and sidewall combustion air inlet Vertical Combustion Air Inlet ClearancesOutdoor vent cap kit Outdoor installation seeOutdoor vent/air inlet location Gas pressure test Connecting to gas supplyGas connections Gas connectionVenting of combination gas valves Combination gas valvesGas train and controls GAS Piping Size Chart Checking gas supply pressureInlet and outlet connections Water flow switchWater connections Heat exchangerPiping of the boiler system Heating boiler installationsRelief valve Water connections heating boilers onlyLow temperature bypass requirements Minimum boiler water temperaturesLow Temperature Return Water Systems LTV Valve Kits Model LTV Valve KITRadiant floor and snow melt heating systems Low system water volumeThree way valves in system Maximum Flow for Heating BoilerInstallation with a chilled water system Temperature / pressure gaugeTypical heating boiler installations DHW installationGPM Diameter4Primary/Secondary Piping of Multiple Boilers Floor Drain Heating Supply Loop 6Primary/Secondary Piping with Buffer Tank Boiler operating control module Installation must comply withElectrical connections AMP Draw DataLow voltage connections Line voltage connectionsEMS or remote thermostat connection DHW Domestic Hot Water thermostatLouver relay Louver proving switchAlarm contacts System supply sensor recommended useWiring of the cascade 4Low Voltage Field Wiring ConnectionsStart-up Placing the boiler in operation Check thermostat circuitsCheck vent and air piping Start the boiler1Lighting Instructions Set clock Configuration of the cascadeSet DHW operation How the appliance operates Operating informationGeneral 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 moduleUser Access modesInstaller To save parameters and exit programmingStatus display screens Inlet Shorted Inlet ***FInlet Open Syssup ***FSTG Demand Unit Pump DelayDHW Pump Delay FAN SpeedOperation of the cascade MIX VAL POS ** %Domestic water heaters Temperature Rise AT Full Rate Fire 90 GPM FlowModel Temperature Rise F 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 Minimum Pump Performance Pump operationHeat exchanger Ft. HdDomestic water temperatures Thermostat adjustment procedureMinimum water temperatures domestic hot water use Cathodic protection Optional relief valveThermal expansion Location of Cold Water Supply Piping ConnectionsOwner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check relief valve Inspect/replace hot surface igniter Check all wiringCheck control settings Ignition system checkoutCheck burner flame Inspect and clean burnerPerform start-up and checks 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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