Lochinvar 402 - 2072 operation manual Sequence of operation, Operation Display

Page 55

Installation & Operation Manual

7 Operating information (continued)

Sequence of operation

 

OPERATION

 

 

 

DISPLAY

 

 

 

 

1.

The manual reset high limit must be closed before any action will

HTR:

Standby

 

take place.

 

 

OUT: 123.8F(129)

2.

Upon a call for heat the control turns on the appropriate pumps

HTR:

Standby

 

(system and boiler pumps for space heating; DHW pump for DHW

 

call). The flow switch and low water cutoff (if equipped) must

OUT: 123.8F(129)

 

close.

 

 

 

 

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

and auto reset high limit (water heater only) inputs must close. OUT: 123.8F(129)

•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 the hot HTR: PREPURGE

surface igniter (HSI) is energized. The HSI is heated for at least OUT: 123.9F(129) 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(129)

6.

If the SMART SYSTEM control does not sense flame, then it will

HTR: POSTPURGE, LOCKOUT

 

lock out.

OUT: 123.9F(129)

 

 

 

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

HTR: RUN STG: 1

 

hold the actual temperature at the set point. If the boiler lights due

 

to a space heating call for heat, and the ramp delay function is

OUT: 124.8F(129)

 

active (default is disabled), the staging will be held to a series of

 

 

increasing limits after the burner has lit.

 

8.If the space heating call for heat is active, and a DHW call for

heat becomes active, the control will turn on the DHW pump, wait HTR: DHW STG 123

2 seconds, and then turn off the boiler pump. This will divert the OUT: 177.8(180) hot water away from the heating zone(s) and send it to the DHW

tank instead. The control will then modulate to maintain the outlet temperature to the DHW boiler set point.

9.If the DHW call for heat remains active for more than 30 minutes, and the space heating call for heat is also on, then the control will

turn on the boiler pump, turn off the DHW pump after 2 seconds, HTR: RUN STG 12

and resume firing based on the space heating set point. As long OUT: 123.0F(129) as both the space heating and DHW calls for heat remain active,

the control will switch back and forth between the two modes until one of them is satisfied.

10.Once both calls for

heat are satisfied, the control will turn

HTR: POSTPURGE

off the burner. The

blower will remain on for the 30 second

postpurge cycle. Any pumps that are running will continue to run

OUT: 127.4F(129)

for their respective pump delay times, then turn off.

 

 

 

11.Boiler pump off, system pump continues its delay if longer.

HTR: Standby

 

 

OUT: 124.7F(129)

12.System pump off.

 

HTR: Standby

 

 

OUT: 122.9F(129)

55

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Contents Save this manual for future reference Models 402Contents Special instructions Please read before proceedingRemoval of Combustion Chamber Lining or Base Panels 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 Venting support General informationBarometric damper location Common Venting Systems Conventional negative draft venting seeNegative draft Flue outlet pipingVertical vent termination clearances and location Masonry chimney installationsInspection of a masonry chimney 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 pipeCombined air inlet points Vertical Rooftop Air InletClearances 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 seeFlue outlet piping Direct venting seeVertical DV venting termination 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/air inlet location Outdoor installation seeOutdoor vent cap kit Gas connection Connecting to gas supplyGas connections Gas pressure testGas train and controls Combination gas valvesVenting of combination gas valves 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 DHW operation Configuration of the cascadeSet clock How the control module operates Operating informationGeneral How the appliance operatesProtection features Temperature controlOutdoor reset operation, if used boilers only Boiler temperature regulationCascade DAY Switching on Sequence DHW, Night Setback, and Ramp Delay operation with cascadeSequence of the cascade 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 PerformanceMinimum water temperatures domestic hot water use Thermostat adjustment procedureDomestic water temperatures Location of Cold Water Supply Piping Connections Optional relief valveThermal expansion Cathodic protectionService technician Maintenance Maintenance and annual startupOwner maintenance 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 flameReview with owner Inspect and clean the heat exchangerOiled bearing circulators 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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