Lochinvar 400-801 service manual Temperature Settings, Data Logging, Functions

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1 Service (continued)

To save any changes and return to the Home Screen, press the RIGHT SELECT [HOME] key. To return to the Status Screen without saving the changes, press the LEFT SELECT [EXIT] key.

Display Timeout

This is the time in which the display remains illuminated. The range is 10 seconds to 10 minutes. The default is 3 minutes.

Temperature Settings

Space Heating (SH1, SH2, SH3) Set Point

CAUTION

Mixing valves are required for the

 

protection of any low temperature loops.

 

There are three (3) individual user set points for better zone control. These are listed as SH1 Set Point through SH3 Set Point. If multiple set points are calling for heat the highest set point has priority. The range is SH Minimum Set point to SH Maximum Set point. The default is 125°F (52°C).

Space Heating (SH) Minimum Set Point

The SH minimum set point sets the minimum water temperature set point that can be used for space heating operation. The user or installer will not be able to program the control with a lower SH set point. This parameter can only be changed by the installer by accessing Minimum SH Set point parameter. The temperature range of this parameter is 32°F (0°C) to the space heating maximum set point. The default value is 32°F (21°C).

Space Heating (SH) Maximum Set Point

The SH maximum set point sets the maximum water temperature set point that can be used for space heating. The user or installer will not be able to program the control with a higher SH set point. This parameter can only be changed by the installer by accessing Maximum SH Set point parameter. The temperature range of this parameter is the space heating minimum set point to 180°F (82°C). The default value is 180°F (82°C).

SH1 - SH3 Offset Set Point

The SH offset sets how many degrees above set point the temperature has to go before the boiler will shut off. This parameter can only be changed by the installer by accessing parameters SH1, 2 and 3 Offset Set point parameters. The temperature range of these parameters is 0°F to 20°F. The default value is 10°F.

SH1 - SH3 Differential Set Point

The SH differential sets how many degrees below the offset the temperature has to drop before the boiler turns back on. This parameter can only be changed by the installer by accessing the SH1, 2 and 3 Differential Set point parameters. The range is 0°F to 60°F. The default is 20°F.

Service Manual

3-Way Valve Time

The optional Lochinvar Multi-Temperature Loop Control Board (MTLCB) can be used to control the supply temperature up to three (3) sub-loops, corresponding to each of the three

(3)SH set points, through the use of 3-way mixing valves. To ensure the MTLCB will control these temperature properly, it is necessary to let the control know how much time these mixing valves require to fully open and close. Program this time into the 3-Way Valve Time parameter. Since this parameter applies to all of the mixing valves used, the actual open/close time must be approximately the same for each one. The minimum setting is 1 second, and the maximum setting is 255 seconds. The default setting is 20 seconds.

Data Logging

Reset log errors

The reset log errors function clears the last 10 errors log.

Functions

Service Mode Delay

By pressing the pin button on the front of the display for five (5) seconds, the control will be placed in Service Mode. This will override all other heat demands. The Service Mode allows the installer to set the unit to any firing rate for the purpose of combustion analysis. The delay sets the length of time the boiler will stay in the Service Mode if no keys have been pressed before going back to its original state. This parameter can only be changed by the installer by accessing the Service Mode Delay parameter. The time range of this parameter is 1 to 10 minutes. The default value is 10 minutes.

Freeze Protection Pump On

The SMART SYSTEM control will turn on the boiler and system pump outputs whenever the inlet temperature drops below this setting. This is done to prevent the water in the heat exchanger from freezing. Certain low-temperature applications (such as snow melt) can operate at temperatures around freezing, so this setting needs to be lowered in these cases. The installer can adjust the temperature at which the pump outputs are turned on by accessing Freeze Protection Pump On parameter. The minimum setting is -3°F (-19°C), and the maximum setting is 45°F (7.2°C). The default setting is 45°F (7.2°C).

Never put the Freeze Protection Pump NOTICE on a setting lower than the Freeze

Protection Burner On setting.

Freeze Protection Burner On

If running the pumps does not prevent the inlet temperature from falling closer to freezing, the SMART SYSTEM control will fire the burner at low fire. The installer can adjust the temperature at which the burner fires by adjusting the Freeze Protection Burner On parameter. The minimum setting is -3°F (-19°C), and the maximum setting is 45°F (7.2°C). The default setting is 37°F (2.8°C).

Never put the Freeze Protection Pump NOTICE on a setting lower than the Freeze

Protection Burner On setting.

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Contents Models 400 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Troubleshooting What is in this manual?Service MaintenanceNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleHow the control module operates Access modesGeneral Operation How the boiler operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessParameter table Description See User Access Installer Access Display ModifyMenu Resetoutdoor ANTI-CYCLING Description See User Access Installer Access Display ModifySoftware Version Temperature units C / FViewable and changeable control parameters Time and DateData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Minimum On/Off Time Cascade OffsetCirculation pumps DHW Pump Anti-Seize Delay Boiler Pump DelayDHW Pump Delay Boiler Pump Anti-Seize DelayService Notification Service technician Maintenance Maintenance and annual startupOwner maintenance Maintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valve Inspect ignition and flame sense electrodes Check ignition ground wiringCheck all boiler wiring Check control settingsModel Kit Part Component Number Description Check flame signalCleaning boiler heat exchanger Review with ownerTest low water flow conditions Test procedureCheck control module fuses TroubleshootingBefore troubleshooting Check the followingUnit Does No DisplayNo Burner OperationResistance Temperature Checking temperature sensorsTemperature Resistance Temperature Resistance Wire Color R/BK and Y Wire Color G and YSystem Pump NoisyNo Pump Boiler PumpTroubleshooting Flame Fail Ign Temp SwOpen Anti-cyclingFlame Sequence Cont’dOutlet Mrhl Outlet ArhlGV/Relay Fan Low/HighFan Speed Low HighInlet Sensor FaultSensor Shorted Louver ProvingFlue Temp Diff Flue Sensor FaultFatal Error Memory ErrorDelta T High Flue Temp HighOutlet Temp Rem Ctrl Flt Service BlkWatch Dog Error No Error StoredCombustion Analysis Procedure Model Gas valve adjustment procedureModels 601
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400-801 specifications

The Lochinvar 400-801 is a high-efficiency commercial boiler that embodies advanced engineering and cutting-edge technology. Designed for a variety of commercial applications, this boiler is known for its reliability, efficiency, and robust performance.

One of the standout features of the Lochinvar 400-801 is its high thermal efficiency, which can reach up to 99%. This efficiency not only reduces fuel consumption but also lowers operating costs, making it an economical choice for businesses seeking to minimize overhead. The boiler employs a stainless steel fire-tube heat exchanger that ensures optimal heat transfer and durability. This construction allows for enhanced resistance to corrosion, thereby extending the boiler's lifespan.

The Lochinvar 400-801 is equipped with advanced control technologies that enhance its performance. With its built-in SMART SYSTEM control, users can easily monitor and manage the boiler’s operations, optimizing performance while ensuring ease of use. This control system features a user-friendly interface that provides real-time data, including temperature settings, pressure readings, and operational status, allowing for quick diagnostics and efficient troubleshooting.

Safety is paramount in the design of the Lochinvar 400-801. The boiler includes a comprehensive safety system that incorporates multiple safety interlocks and a venting system that prevents backflow and ensures safe exhaust. Moreover, the unit is designed to operate with minimal noise, making it suitable for environments where noise reduction is crucial.

Installation and maintenance of the Lochinvar 400-801 are straightforward, thanks to its compact design and multiple venting options. The low-profile construction allows for flexibility in placement, making it an ideal fit for tight spaces. Maintenance tasks are simplified with accessible components, minimizing downtime and ensuring the system operates efficiently over its lifespan.

In conclusion, the Lochinvar 400-801 stands out in the commercial boiler market with its blend of efficiency, reliability, and innovation. With its advanced technologies and features, businesses can achieve significant energy savings while ensuring comfortable and consistent heat for various applications. The Lochinvar 400-801 is an investment in quality and performance, backed by a well-established brand in the heating industry. Whether for a new installation or a replacement, this boiler offers a comprehensive solution for commercial heating needs.
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