Lochinvar 151 - 801 service manual Gas valve adjustment procedure, Models 151

Page 37

Service Manual

3Troubleshooting (continued)

Gas valve adjustment procedure

If adjustment of the gas valve is deemed necessary, use the following procedures: (Note: The procedures in this section are model specific.)

Models 151 - 286

Locate the throttle adjustment screw on the side of the venturi valve (FIG. 3-2). Using a screwdriver, turn the screw a 1/4 turn clockwise to decrease CO2 levels or a 1/4 turn counterclockwise to increase CO2 levels. After performing one adjustment on the valve, follow the Combustion Analysis Procedure on page 36 of this manual to measure the combustion.

If combustion is still not within the specified range, repeat the procedure. This procedure SHOULD NOT be performed more than four (4) times. If after four (4) adjustments and the combustion is still not within the specified range, revisit the possible causes in Table 3H on page 36 or replace the gas valve.

Figure 3-2Gas Valve Adjustment: Models 151 - 286

Model 400

Locate the throttle adjustment screw on the top of the gas valve, see FIG. 3-3. Using a screwdriver, turn the screw 1/8 turn counterclockwise to increase CO2 levels or 1/8 turn clockwise to decrease CO2 levels. After one adjustment on the valve, follow the Combustion Analysis Procedure on page 36 of this manual to measure the combustion.

If combustion is still not within the specified range, repeat the procedure. This procedure SHOULD NOT be performed more than four (4) times. If after four (4) adjustments and the combustion is still not within the specified range, revisit the possible causes in Table 3H on page 36 or replace the gas valve.

Figure 3-3Gas Valve Adjustment: Model 400

THROTTLE ADJUSTMENT

SCREW

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Contents Models 151 Contents Handling ceramic fiber materials Please read before proceedingNiosh 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 Service technician Maintenance Maintenance and annual startupOwner 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 HighOutlet Temp High Service BlkRem Ctrl Flt No Error Stored Watch Dog ErrorFatal Error Low 24 VACGas Valve Adjustment Combustion Analysis ProcedureOr Obstruction Gas Supply PressureModels 151 Gas valve adjustment procedureModel 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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