Lochinvar 800 operation manual Sequence of operation, BLR Ignition

Page 60

 

 

 

 

 

 

Installation & Operation Manual

 

 

 

 

11 Operating information

 

 

Sequence of operation

 

 

 

 

 

 

 

 

 

 

 

OPERATION

 

DISPLAY

1. Upon a call for heat, the control turns on the appropriate pumps

BLR: Standby

 

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

 

for DHW call).

OUT: 123.8F(129)

2. The control

connects 120 VAC to the blower. The blower

 

 

 

does not run at this time.

BLR: Standby

 

• The manual reset high limit must be closed and reset.

 

OUT: 123.8F(129)

 

• Once the pumps are turned on, the flow switch must close.

• If the unit is equipped with gas pressure switches, they must

 

close.

 

 

 

 

 

 

• If an auxiliary limit is connected to the unit, it must close.

 

 

 

• The air pressure switch must be closed.

 

 

3. The control then starts a 15 second prepurge cycle.

BLR: PREPURGE

 

 

 

 

 

OUT: 123.9F(129)

4. Once the prepurge cycle is complete, and the blocked drain

BLR: IGNITION

 

switch is closed, the control starts the 4 second trial for ignition

 

by sending spark voltage to the spark electrode and opening

OUT: 123.9F(129)

 

the gas valve.

 

 

 

 

 

5. If the control does not detect flame before the trial for ignition

 

 

 

ends, the control will perform a 10 second postpurge. The 399

BLR: POSTPURGE, PREPURGE

 

model will start another prepurge and trial for ignition. If the

 

burner does not light after 4 trials on the 399 model, the control

OUT: 123.9F(129)

 

will lock out for one hour and then try again.

 

 

 

If the burner does not light after 1 retry on Models 500 - 800 the

 

 

 

control will lock out.

 

 

6. If the control detects a flame before the trial for ignition ends, it

BLR: SH 20% RATE

 

begins to modulate the burner in order to maintain the set point.

 

If the boiler lights due to a space heating call for heat, and the

OUT: 124.8F(129)

 

ramp delay

function is active (default is off), the modulation

 

 

 

will be held to a series of increasing limits afterthe burner has lit.

 

 

7. If the

space heating call for heat is active, and the DHW

 

 

 

thermostat or sensor starts a DHW call for heat, the control will

BLR: DHW 85% RATE

 

turn on the DHW pump, wait 2 seconds, and then turn off the

 

boiler pump.

This will divert the hot water away from the

OUT: 177.8(180)

 

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.

 

 

 

 

 

8. If the boiler is not part of a cascade, and the DHW call for heat

 

 

 

remains active for more than 30 minutes, and the space heating

 

 

 

call for heat is also active, then the control will turn on the boiler

BLR: SH 41% RATE

 

pump, turn off the DHW pump after 2 seconds, and resume

 

modulating based on the space heating set point. As long as

OUT: 123.0F(129)

 

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.

 

 

9. Once both calls for heat are satisfied, the control will turn off the

BLR: POSTPURGE

 

burner.

The blower will remain on for the 10 second postpurge

 

cycle.

Any pumps that are running will continue to run for their

OUT: 127.4F(129)

 

respective pump delay times, then turn off.

 

 

10.

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

BLR: Standby

 

 

 

 

 

OUT: 124.7F(129)

11.

System pump off.

BLR: Standby

 

 

 

 

 

OUT: 122.9F(129)

60

Page 59 Page 61
Image 60
Page 59 Page 61
Contents Models 399 Save this manual for future referenceContents When servicing boiler Please read before proceedingKnight XL How it works Air pressure switch Pump relay board ModelModels 600 Ratings Knight XL Boiler =B=R RatingInstallation must comply with Closet and alcove installationsDetermine boiler location Before locating the boiler, checkFor closet installations, Cpvc or TOPResidential garage installation Provide air openings to roomVent and air piping Flooring and foundationWhen using an existing vent system to install a new boiler Products to avoidAreas likely to have contaminants When removing a boiler from existing common vent system Prepare boiler Remove boiler from wood palletModel Gas conversionsLeveling the boiler Models 600General venting Direct venting options Vertical Vent Install vent and combustion air piping Requirements for installation in CanadaInstalling vent or air piping General ventingPVC/CPVC air intake/vent connections Approved Stainless Steel Vent ManufacturersMake Air inlet pipe materials Stainless steel ventFasNSeal Saf-T Vent Stainless steel air intake/vent connectionsOptional room air Removing from existing ventModel Description Kit Number Air contaminationIf using the alternate sidewall termination Sidewall direct ventingVent/air termination sidewall Determine location3AClearance to Gravity Air Inlets Prepare wall penetrations Bird Screen TypicalPrepare wall penetrations Alternate Field Supplied Option Multiple vent/air terminationsTermination and fittings Sidewall termination installation Description and usage9Concentric Vent Dimensional Drawing Models 399 11Concentric Vent Sidewall Attachment Multiventing sidewall terminationsVertical direct venting Vent/air termination verticalPrepare roof penetrations 2Vertical Terminations with Multiple BoilersVertical termination installation 4Concentric Vertical TerminationMultiventing vertical terminations Mm see -9,Hydronic piping Hydronic piping Flow switch adjustment Near boiler piping connectionsCirculator sizing Head Feet Pressure20F 25F 30F 35F 399 500 600 700 800Near boiler piping components 7Single Boiler Primary/Secondary Piping Number of Units Model Manifold Pipe Sizes in Inches mm Connecting gas supply piping Gas connectionsNatural gas Propane GasNominal Natural Gas Pipe Capacity Chart Check inlet gas supplyIron Pipe Length of Pipe in Straight FeetGas valve replacement Gas PressureField wiring Installation must comply withLine voltage connections Outdoor temperature sensor Auxiliary device proving switchHigh gas pressure switch Low gas pressure switchAlarm contacts Wiring of the cascadeSystem supply sensor Boiler management system3Low Voltage Field Wiring Connections Condensate disposal Condensate drainFreeze protection when used Start-upCheck/control water chemistry Fill and test water systemCheck for gas leaks Check thermostat circuitsInspect/fill condensate system Inspect/check condensate lines and fittingsFinal checks before starting the boiler Start the boilerIf boiler does not start correctly Check system and boilerFor Your Safety Read Before Operating Set space heating operation Natural Gas PropaneConfiguration of the cascade Set domestic hot water DHW operationOperating information GeneralProtection features Boiler temperature regulation Outdoor reset operation, if usedCascade DHW, Night Setback, and Ramp Delay operation with Cascade Sequence of the cascadeSequence of operation BLR IgnitionKnight XL control module ShutdownAccess modes InstallerUser To save parameters and exit programmingService StandbySet Point Met PrepurgeSYS ***.*F Control will display the actual fan motor RPMDelay 10V in **.VdcOperation of the cascade Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Address reported problemsClean condensate trap Check all piping for leaks Inspect boiler areaFlue vent system and air piping Check water systemCheck expansion tank Check boiler relief valveCheck ignition ground wiring Check all boiler wiringCheck control settings Inspect ignition and flame sense electrodesCheck flame signal Cleaning boiler heat exchangerReview with owner Diagrams High Voltage2Ladder Diagram Page

800 specifications

Lochinvar 800 is a groundbreaking boiler system designed to meet the heating needs of modern residential and commercial buildings. Renowned for its reliability and advanced technology, the Lochinvar 800 promises efficiency and performance that set it apart from conventional heating systems.

One of the standout features of the Lochinvar 800 is its high-efficiency heat exchanger, which enables significantly lower energy consumption compared to traditional units. This efficiency translates to substantial energy savings, making it not only an environmentally friendly choice but also a cost-effective one. The system boasts an impressive thermal efficiency rating, often exceeding 95%, which ensures that a large portion of the energy consumed is converted into usable heat.

Incorporating cutting-edge control technologies, the Lochinvar 800 utilizes smart controls that enable precise temperature regulation. These controls provide users with the ability to program and adjust settings according to specific heating needs, enhancing comfort while minimizing energy waste. The integration of modulating gas burners further optimizes energy usage, continuously adjusting the output based on the current demand, thereby preventing energy loss.

Another key characteristic of the Lochinvar 800 is its compact and sleek design, allowing for easy installation in various spaces, from utility rooms to commercial settings. The boiler's lightweight construction means that it can be mounted in tight areas, providing flexibility that adapts to the needs of the installation site.

Safety features are a top priority for the Lochinvar 800, equipped with advanced diagnostics and monitoring systems that ensure trouble-free operation. These systems continually assess performance and identify potential issues before they can evolve into serious problems, promoting longevity and reliability.

The Lochinvar 800 is also compatible with various heating distribution systems, including radiant floor heating and traditional radiators, making it a versatile choice for a wide range of applications. Coupled with its low emissions profile, the Lochinvar 800 stands out as a sustainable option in today’s market.

In summary, the Lochinvar 800 represents a new era in boiler design, merging efficiency, innovative technology, and adaptability to meet the challenges of contemporary heating needs. Its advanced features ensure optimal performance while maintaining a commitment to environmental responsibility, making it an ideal solution for energy-conscious consumers.
Top Page Image Contents