Lochinvar 50-210 service manual Sequence of operation, OUT 123.8F129

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.

 

 

 

 

• If the unit is equipped with a flow switch or low water cutoff, it

 

 

 

 

must close before the control powers up the blower.

 

 

 

 

• If the unit is equipped with a manual reset high limit it must be

BLR: Standby

closed before the control powers up the blower.

• If the unit is equipped with a solenoid valve and/or a vent

valve, they will be energized along with the blower.

OUT: 123.8F(129)

• If the unit is equipped with a gas pressure switch, it must close

 

 

 

 

at this time.

 

 

 

 

• If there is an auxiliary device connected to the unit, the unit

 

 

 

 

will then provide 24 vac to its enable relay. If the auxiliary

 

 

 

 

device has a proving switch, it must close before the

 

 

 

 

sequence continues.

 

 

 

 

 

 

 

3. The control then starts a 10 second prepurge cycle.

BLR: PREPURGE

 

OUT: 123.9F(129)

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

BLR: IGNITION

switch and auto-reset high limit are closed, the control starts

the 5 second trial for ignition by sending spark voltage to the

OUT: 123.9F(129)

spark electrode and opening the gas valve.

 

 

 

 

 

 

 

 

 

5. If the control does not detect flame by the end of the trial for

BLR: POSTPURGE, PREPURGE

ignition, the control performs a 10 second postpurge, another

prepurge and tries to light the burner again. If the burner does

OUT: 123.9F(129)

not light after 4 trials, the control locks out for 1 hour and then

 

 

 

 

tries another set of 4 trials.

 

 

 

 

 

 

 

 

 

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

BLR: DHW 85% RATE

thermostat closes, the control will turn on the DHW pump, wait

2 seconds, and then turn off the boiler pump. This will divert

the hot water away from the heating zone(s) and send it to the

OUT: 177.8(180)

DHW tank instead. The control will then modulate to maintain

 

 

 

 

the outlet temperature to the DHW boiler set point.

 

 

 

 

 

 

 

 

 

 

 

 

11

 

 

 

 

 

 

 

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Page 10 Page 12
Contents Models 50 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 ServiceKnight wall mount display Control inputs Smart Control ModuleControl outputs Sequence of operation General OperationHow the boiler operates How the control module operatesOUT 123.8F129 Sequence of operationBLR SH 41% Rate Display panel menu access Display panel parameter access Parameter table Temperature DataControl Circulation Service Viewable and changeable control parameters Temperature settingsFunctions DHW settingsOutdoor air reset Data loggingOutdoor air shutdown Shift reset curveMaximum SH set point Minimum 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 settingsOiled bearing circulators Check flame signalCleaning boiler heat exchanger Review with ownerCheck the following TroubleshootingBefore troubleshooting Check control module fusesUnit Does Not No DisplayNo Burner OperationTemperature Resistance Checking temperature sensorsDHW Pump NoisyNo Pump Boiler Pump System PumpSequence Switch/LWCOFlow FlameNo Flame Ign Anti-cyclingRunning No FlameFan Speed Low Auto ResetHigh Limit Fan LowSensor Shorted Fan HighFan Speed High Sensor OpenTemp O/Shoot Open Rem Ctrl FltParameters Progr Low 24 vac Service BlkWatch Dog Error No Error StoredGas Supply Pressure Combustion Analysis ProcedureGas Valve Adjustment Or Obstruction2Gas Valve Adjustment Gas valve adjustment procedurePage

50-210 specifications

The Lochinvar 50-210 is a powerful and efficient boiler designed for residential and commercial heating applications. This model is a part of Lochinvar’s line of advanced heating solutions, known for their reliability, efficiency, and innovative technologies. The 50-210 offers a high thermal efficiency rating, ensuring that energy consumption is minimized while still providing excellent heating performance.

One of the standout features of the Lochinvar 50-210 boiler is its advanced control system. It is equipped with a user-friendly LCD display that allows easy access to system settings and real-time performance data. This technology enhances user experience, allowing for easy adjustments and monitoring, ensuring optimal performance based on specific heating needs.

The Lochinvar 50-210 is designed with a fully modulating burner, which means it can adjust its output to match the heating demand effectively. This feature not only provides superior comfort but also increases energy savings by preventing the boiler from running at full capacity when it's not necessary. Moreover, the modulating burner minimizes wear and tear, extending the lifespan of the unit.

In terms of safety, the Lochinvar 50-210 incorporates several features such as multiple temperature and pressure sensors, flame safeguard systems, and safety cut-off controls. These safeguard mechanisms ensure that the system operates safely and efficiently, providing peace of mind to users.

The construction of the Lochinvar 50-210 is robust, featuring high-grade stainless steel and a durable heat exchanger. This design helps resist corrosion, ensuring longevity and requiring minimal maintenance over the years. Additionally, its compact design allows for easier installation, making it suitable for various settings, even those with limited space.

Furthermore, the Lochinvar 50-210 operates quietly, which adds to its appeal for residential installations. Its environmental considerations are also noteworthy, with low emissions contributing to cleaner air quality.

Overall, the Lochinvar 50-210 is a sophisticated heating solution that blends efficiency, reliability, and advanced technology. With its user-friendly controls, modulating burner, safety features, and durable construction, it meets the heating demands of modern homes and commercial spaces, making it a top choice for those seeking dependable boiler performance.
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