Lochinvar 399 - 800 service manual Sequence of operation, BLR Ignition

Page 11

Service Manual

1Service (continued)

Sequence of operation

Table 1A Sequence of operation - space heating and DHW

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

OUT: 123.8F(129)

for DHW call).

 

 

 

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.

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

OUT: 123.8F(129)

• 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.

On the 500 - 800 models, the control will lock out indefinitely

 

after the first trial for ignition fails.

 

 

 

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

ramp delay function is active (default is off), the modulation

OUT: 124.8F(129)

will be held to a series of increasing limits after the 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.

 

 

 

11

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Contents Models 399 Contents Niosh stated First Aid Please read before proceedingHandling ceramic fiber materials When servicing boiler Troubleshooting What is in this manual?Service MaintenanceNear boiler piping ServiceMenu / Exit UP Down Knight XL displayControl inputs Control outputs Smart Control ModuleSequence of operation General OperationHow the boiler operates How the control module operatesBLR Ignition Sequence of operationBLR SH 41% Rate Use this procedure to access menus from the display panel Display panel menu accessValue will appear Display panel parameter accessParameter table Temperature DataControl Circulation Service Viewable and changeable control parameters Temperature settingsFunctions DHW settingsOutdoor air reset Data loggingMinimum SH set point Maximum air temperatureShift reset curve Maximum SH set pointAnti-cycling Boiler cascade address Control modesSH controlling sensor SH sourceCirculation pumps Service NotificationCascade offset Owner maintenance Maintenance Maintenance and annual startupService technician Maintenance Check boiler relief valve Flue vent system and air pipingCheck water system Check expansion tankInspect ignition and flame sense electrodes Check ignition ground wiringCheck all boiler wiring Check control settingsReview with owner Check flame signalCleaning boiler heat exchanger Check the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does Not No DisplayNo Burner OperationTemperature Resistance Checking temperature sensorsSystem Pump NoisyNo Pump Operation Boiler PumpSequence Switch/LWCOFlow FlameNo Flame Ign Anti-cyclingRunning No FlameFan Speed Low Adjustable HighLimit w/Manual Fan LowSensor Shorted Fan HighFan Speed High Sensor OpenTemp O/Shoot Open Rem Ctrl FltParameters ProgrLow 24 VAC Service BlkWatch Dog Error No Error StoredGas Supply Pressure Combustion Analysis ProcedureGas Valve Adjustment Or ObstructionModels 600 Gas valve adjustment procedureModel Page Page KBX-SER Rev E
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399 - 800 specifications

Lochinvar is known for its cutting-edge water heating and boiler systems, and the Lochinvar 399 - 800 series is no exception. Specifically designed for commercial applications, this series brings advanced technology and engineering to the forefront of hydronic heating solutions.

One of the standout features of the Lochinvar 399 - 800 series is its impressive efficiency. Equipped with a condensing design, these boilers utilize high-efficiency stainless steel heat exchangers that allow for maximum heat transfer while minimizing energy consumption. With an impressive thermal efficiency of up to 96%, the Lochinvar 399 - 800 series stands out in its class, offering significant energy savings and reduced operational costs over time.

Another key characteristic of this series is its robust construction. Designed with longevity in mind, the boilers are built using high-quality materials that withstand extreme temperatures and pressures. The stainless steel design not only enhances durability but also combats corrosion, ensuring a long service life and reduced maintenance costs for users.

The Lochinvar 399 - 800 series also incorporates advanced control technologies. With its intuitive control system, users can easily adjust and monitor heating parameters, ensuring optimal performance and comfort. The integrated Control Wizard feature simplifies the setup process, allowing for quick commissioning and troubleshooting. Additionally, the optional Lochinvar SMART CONTROL technology provides remote monitoring capabilities, allowing operators to keep track of system performance from anywhere.

Versatility is another hallmark of the Lochinvar 399 - 800 series. These boilers come in a range of sizes, with the ability to modulate output based on real-time heating demands. This flexibility ensures that systems can operate efficiently under varying load conditions, making them ideal for schools, hospitals, and commercial buildings requiring consistent hot water availability.

In summary, the Lochinvar 399 - 800 series exemplifies modern boiler technology, combining energy efficiency, durability, advanced controls, and versatility. As businesses and facilities seek to enhance their heating systems, the Lochinvar 399 - 800 offers a reliable and forward-thinking solution for today's energy-conscious environment. Investing in this state-of-the-art boiler system not only improves comfort but also fosters sustainability and cost-effectiveness in commercial heating applications.