Lochinvar 402 - 2072 Relief valve, Heating boiler installations, Piping of the boiler system

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4 Water connections (continued)

Relief valve

This unit is supplied with a relief valve(s) sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV (“Heating Boilers”). The relief valve(s) is installed in the vertical position and mounted in the hot water outlet. No valve is to be placed between the relief valve and the unit. To prevent water damage, the discharge from the relief valve shall be piped to a suitable floor drain for disposal when relief occurs. No reducing couplings or other restrictions shall be installed in the discharge line. The discharge line shall allow complete drainage of the valve and line. Relief valves should be manually operated at least once a year.

￿ CAUTION Avoid contact with hot discharge water.

Heating boiler installations

Piping of the boiler system

The drawings in this section show typical boiler piping installations, see FIG.’s 4-3 through 4-6. Before beginning the installation, consult local codes for specific plumbing requirements. The installation should provide unions and valves at the inlet and outlet of the boiler so it can be isolated for service. An air separation device must be supplied in the installation piping to eliminate trapped air in the system. Locate a system air vent at the highest point in the system. The system must also have a properly sized expansion tank installed. Typically, an air charged diaphragm-type expansion tank is used. The expansion tank must be installed close to the boiler and on the suction side of the system pump to ensure proper operation.

￿ CAUTION

The boiler system should not be operated at

 

less than 12 PSIG.

 

Hot water piping must be supported by suitable hangers or floor stands, NOT by the boiler. Copper pipe systems will be subject to considerable expansion and contraction. Rigid pipe hangers could allow the pipe to slide in the hanger resulting in noise transmitted into the system. Padding is recommended on rigid hangers installed with a copper system. The boiler pressure relief valve must be piped to a suitable floor drain. See the Relief Valve section on this page.

￿ CAUTION

A leak in a boiler “system” will cause the

 

“system” to intake fresh water constantly,

 

 

which will cause the tubes to accumulate a

 

lime/scale build up. This will cause a non-

 

warrantable failure.

Water connections (heating boilers only)

Models 402 - 752 have 2" NPT inlet and outlet connections and Models 992 - 2072 have 2 1/2" NPT inlet and outlet connections.

￿ CAUTION

Field installed reducing bushings must not

be used.

Installation & Operation Manual

Any reduction in pipe size may decrease flow resulting in high water temperatures, boiler noise, flashing to steam, and non- warrantable heat exchanger damage.

The boiler may be installed with a primary/secondary piping system provided to the boiler. It is important to guarantee that adequate flow is provided to properly dissipate heat from the boiler and also ensure that flow through the boiler does not exceed the maximum recommended flow rate of 55 GPM for Models 402 - 752 and 90 GPM for Models 992 - 2072 for a boiler equipped with a copper heat exchanger.

Boiler circulator requirements

This is a low mass, high efficiency hot water boiler which must have adequate flow for quiet, efficient operation. Pump selection is critical to achieve proper operation. A pump should be selected to achieve proper system design water temperature rise. Pipe diameter and length are critical to ensure proper flow through the boiler. A System Temperature Rise Chart (Table 4C on page 38) is provided to assist in proper pump selection. This table provides GPM and boiler head-loss at various temperature rises for each model based on Btu/hr input. Temperature rise is the difference in boiler inlet temperature and boiler outlet temperature while the boiler is firing at full rate.

Example: The boiler inlet temperature is 160°F (71.1°C) and the boiler outlet temperature is 180°F (82.2°C). This means that there is a 20°F (11.1°C) temperature rise across the boiler. The boiler temperature rise is visible in the Operator Interface on the boiler’s front control panel.

Circulator pump specifications

1.Maximum operating pressure for the pump must exceed system operating pressure.

2.Maximum water temperature should not exceed the nameplate rating.

3.Cast iron circulators may be used for closed loop systems.

4.A properly sized expansion tank must be installed near the boiler and on the suction side of the pump.

Circulator pump operation (heating boilers only)

The boiler pump must run when the boiler is firing. Separate supply circuits can be provided or the two circuits (pump and controls) can be combined for connection to one circuit, properly sized for both.

Pump delay operation

A pump delay operation feature is provided. The boiler’s circulating pump will cycle on at each call for heat, before the burner fires. The pump will continue to operate while the burner is firing. The pump will run for a 30 second period after the temperature set point is satisfied. This timing is selectable from the Operator Interface. This timing will remove any of the residual heat from the combustion chamber before turning the pump off. See the wiring diagram in Section 9 of this manual.

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Contents Save this manual for future reference Models 402Contents Removal of Combustion Chamber Lining or Base Panels Please read before proceedingSpecial instructions Owner warning Safety informationCopper-fin II How it works Copper-fin II How it works Copper-fin II How it works Copper-fin =B=R Rating RatingsFreeze protection Determine unit locationLocation of unit Indoor clearances from combustible constructionCombustion and ventilation air Outdoor boiler installationLocation Hydronic systems anti-freezeMinimum Recommended Combustion AIR Supply to Equipment Room Outside Combustion Air Using Direct VentingCombustion air filter Exhaust fansCAT I Negative pressure non-condensing VentingIdentify your appliance’s vent system CAT IV Flue pipe materialsDirect Vent see Barometric damper location General informationVenting support Common Venting Systems Conventional negative draft venting seeNegative draft Flue outlet pipingInspection of a masonry chimney Masonry chimney installationsVertical vent termination clearances and location 1Vent Termination from Peaked Roof 10 ft. or Less From Ridge Sidewall air inlet Vertical DirectAire venting seeCombustion air inlet piping Length of air inlet pipeClearances Vertical Rooftop Air InletCombined air inlet points Directaire Kits Model Horizontal KIT Vertical KIT Venting of flue productsSidewall vent termination clearances and location Sidewall venting seeSidewall with fan Sidewall venting terminationSidewall venting without fan Drain tee installationModels 402 Venting of flue products Horizontal DirectAire venting Powered Venting seeVertical DV venting termination Direct venting seeFlue outlet piping Combustion air inlet piping Masonry chimney installationHorizontal DV venting termination Horizontal Vent Termination Clearances and LocationSealing PVC, CPVC, ABS, dryer vent, and flex duct vent pipe Connecting the air inlet pipe to the unitAir inlet piping materials Length of air inlet pipeVertical Combustion Air Inlet Clearances Multiple sidewall direct vent installationsVertical and sidewall combustion air inlet Horizontal combustion air inlet clearancesOutdoor vent cap kit Outdoor installation seeOutdoor vent/air inlet location Gas connection Connecting to gas supplyGas connections Gas pressure testVenting of combination gas valves Combination gas valvesGas train and controls Checking gas supply pressure GAS Piping Size ChartHeat exchanger Water flow switchWater connections Inlet and outlet connectionsWater connections heating boilers only Heating boiler installationsRelief valve Piping of the boiler systemLTV Valve Kits Model LTV Valve KIT Minimum boiler water temperaturesLow Temperature Return Water Systems Low temperature bypass requirementsMaximum Flow for Heating Boiler Low system water volumeThree way valves in system Radiant floor and snow melt heating systemsDHW installation Temperature / pressure gaugeTypical heating boiler installations Installation with a chilled water systemDiameter GPM4Primary/Secondary Piping of Multiple Boilers Floor Drain Heating Supply Loop 6Primary/Secondary Piping with Buffer Tank AMP Draw Data Installation must comply withElectrical connections Boiler operating control moduleDHW Domestic Hot Water thermostat Line voltage connectionsEMS or remote thermostat connection Low voltage connectionsSystem supply sensor recommended use Louver proving switchAlarm contacts Louver relay4Low Voltage Field Wiring Connections Wiring of the cascadeStart-up Start the boiler Check thermostat circuitsCheck vent and air piping Placing the boiler in operation1Lighting Instructions Set clock Configuration of the cascadeSet DHW operation How the control module operates Operating informationGeneral How the appliance operatesProtection features Temperature controlCascade 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 Operation Display Sequence of operationCopper-fin II control module MENU/EXIT Display Screen ENTER/RESET UpdownTo save parameters and exit programming Access modesInstaller UserStatus display screens Syssup ***F Inlet ***FInlet Open Inlet ShortedFAN Speed Unit Pump DelayDHW Pump Delay STG DemandMIX VAL POS ** % Operation of the cascadeMaximum Water Flow Temperature Rise AT Full Rate Fire 90 GPM FlowModel Temperature Rise F Domestic water heatersWater 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 Ft. Hd Pump operationHeat exchanger Minimum Pump PerformanceDomestic water temperatures Thermostat adjustment procedureMinimum water temperatures domestic hot water use Location of Cold Water Supply Piping Connections Optional relief valveThermal expansion Cathodic protectionOwner maintenance Maintenance Maintenance and annual startupService technician Maintenance Ignition system checkout Check all wiringCheck control settings Check relief valve Inspect/replace hot surface igniterCheck flue gas passageways Inspect and clean burnerPerform start-up and checks Check burner flameOiled bearing circulators Inspect and clean the heat exchangerReview with owner Digital Harness Connection diagramSplay Ladder DiagramFlow 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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