Lochinvar 151 - 801 service manual Operation Display

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Service Manual

1Service (continued)

Table 1A Sequence of operation

OPERATION

DISPLAY

 

 

1.The control will turn on the water heater pump (always ON except in Night Setback). The flow switch and/or LWCO must close.

2.The control turns on power to the louver relay. The louver proving switch, air pressure switch, and blocked drain switch must close.

3.The control starts a 15 second prepurge cycle.

4.The control starts a 4 second trial for ignition by firing the spark electrode and opening the gas valve.

5.If flame is not detected within 1 second after the sparking ends, the control will perform a 10 second post-purge, then start another prepurge cycle and try to light the burner again. On the 501 and larger models, the control will lock out if this second attempt also fails. On the 400 and smaller models, the control will perform a total of 4 attempts before locking out.

6.If flame is detected, it holds the firing rate steady for 5 seconds to let the flame stabilize, then it begins to modulate the firing rate based on a set point or some other command (such as a 0-10V BMS signal).

7.Once the call for heat is satisfied, the control will turn off the burner. The blower will continue to run during a 10 second postpurge.

8.The water heater pump will continue to run for its respective pump delay time before turning off. A 60 second anti-cycle period will start, which will delay any new call for heat until it times out.

9.In Standby, ready to start a new cycle.

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Contents Models 151 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid Service What is in this manual?Maintenance TroubleshootingArmor water heater display ServiceControl inputs Smart System Control BoardControl outputs Smart System Control BoardGeneral Operation Access modesHow the water heater operates Sequence of operationOperation Display Button Screen Operation Display Status Display panel menu accessDisplay panel parameter access General Parameter tableModes Viewable and changeable control parameters Data Logging DHW SettingsFunctions Anti-CyclingControl modes Circulation pumps Minimum On/Off TimeService Notification Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check water heater relief valveCheck all water heater wiring Check ignition ground wiringCheck control settings Perform start-up and checksCleaning heat exchanger Check flame signalReview with owner Oiled bearing circulatorsBefore troubleshooting TroubleshootingCheck control module fuses Check the followingNo Burner No DisplayOperation Unit Does NotTemperature F Resistance Ω Checking temperature sensorsWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNo Pump NoisyRelief Valve OpeningFlow Switch Fault Description Corrective ActionFlame Fail Ign Anti-cyclingRunning No FlameManual Reset Auto ResetFlame Sequence High LimitFan Speed Low Fan LowGV/Relay FailLouver Proving Sensor ShortedFlue Temp High Delta T HighService Blk Outlet Temp HighRem Ctrl Flt No Error Stored Watch Dog ErrorFatal Error Low 24 VACGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureGas valve adjustment procedure Models 151Model Models 601 4Gas Valve Adjustment Model

151 - 801 specifications

Lochinvar 151 - 801 is a high-efficiency commercial water heater designed to meet the demanding needs of various applications in the hospitality, healthcare, and educational sectors. This advanced system provides reliable hot water with enhanced performance while promoting energy conservation and sustainability.

One of the standout features of the Lochinvar 151 - 801 is its powerful heating capability. With a robust heating input of up to 150,000 BTU per hour, it ensures a steady supply of hot water even during peak demand times. The efficient heat exchanger design optimizes thermal performance, allowing for quicker recovery rates, which is essential for facilities requiring substantial hot water usage.

This model integrates cutting-edge technologies to maximize energy efficiency. Utilized in the Lochinvar 151 - 801 is the Smart System control technology, which provides precise temperature management and diagnostics. This feature not only enhances operation efficiency but simplifies service and maintenance by providing real-time data and alerts, leading to reduced downtime.

Additionally, the Lochinvar 151 - 801 employs a stainless-steel tank construction that promotes durability and robustness. The tank is adequately insulated to minimize heat loss, thus keeping energy costs down. Its compact design also allows for easy installation in various spaces, including those with limited footprints.

Moreover, the unit features advanced combustion technology, including a modulating gas valve that adjusts the flame size according to demand, promoting even greater efficiency. This ensures that the water heater operates at optimum performance levels, reducing fuel consumption while ensuring a consistent supply of hot water.

Safety is a primary concern for Lochinvar, and the 151 - 801 model includes several integrated safety features, such as an ignition safety shutoff and a temperature/pressure relief valve. These systems work together to provide peace of mind while ensuring the unit operates safely within its designated parameters.

In conclusion, the Lochinvar 151 - 801 is an exemplary choice for commercial applications, offering powerful performance, efficient technologies, durable construction, and enhanced safety features. With its combination of high output and advanced monitoring capabilities, it stands as a reliable solution for organizations seeking an effective hot water heating solution.
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