Lochinvar 400-801 service manual Anti-Cycling

Page 22

Service Manual

1 Service

Outdoor Air Shutdown Differential (SH1 - SH3)

Boost Time

The outdoor air shutdown differential parameter is the number of degrees below Outdoor Air Shutdown SH1, SH2, and SH3 parameters the outdoor air temperature must go before the boiler will respond to a SH demand. These parameters can be changed by the installer by accessing the Outdoor Air Shutdown Differential SH1, SH2, and SH3 parameters The temperature range of this parameter is 0°F (0°C) to 54°F (30°C). The default value is 10°F (6°C).

Shift Reset Curve (SH1 - SH3)

There is a shift reset curve for each outdoor reset. The shift reset curve parameter shifts the actual set point above or below the calculated set point by the number of degrees in this parameter. These parameters can be changed by the installer by accessing the Shift Reset Curve SH1, SH2, and SH3 parameters. The temperature range of this parameter is -17°F (-10°C) to 18°F (10°C). The default value is 0°F (0°C). This feature will be active if this parameter is set to anything other than 0°F (0°C).

The boost time parameter sets the amount of time that must elapse with a SH demand before the water temperature calculated set point will be increased. This parameter can be changed by the installer by accessing the Boost Time parameter. The time range for this parameter is 0 minute to 50 minutes. The default value is 0 minutes.

Anti-Cycling

Anti-Cycling Time

Once a SH demand has been satisfied, a set amount of time must elapse before the control will respond to a new SH demand. The control will block the new heat demand and anti-cycling will be shown in the display until the time has elapsed or the water temperature drops below the Anti-Cycling Override Differential parameter. This parameter can be changed by the installer by accessing the Anti-Cycling Time parameter. The time range for this parameter is 1 minute to 10 minutes. The default value is 1 minute.

Boost Temperature

Anti-Cycling Override Differential

If a SH demand lasts longer than the programmed time

The control will bypass the anti-cycling time if the inlet

delay setting and there have been no DHW demands, the

water temperature drops too much. The control will use the

control will increase the water temperature set point by the

inlet water temperature the boiler was at when it shut off as

amount in this parameter. If the SH demand continues

the starting point. If the inlet temperature drops below the

through another time period, the set point will be increased

temperature parameter the control will abort anti-cycling and

again. This will continue until either the SH demand ends,

allow the boiler to fire. This parameter can be changed by

a maximum of 20 increases has occurred, or SH1, SH2,

the installer by accessing the Anti-Cycling Override Differential

SH3 maximum set point has been reached. Once the SH

parameter. The temperature range of this parameter is 0°F (0°C)

demand has been satisfied the set point will revert back

to 54°F (30°C). The default value is 10°F (6°C).

to its calculated setting. The boost temperature can be

Ramp Delay (Enable / Disable)

changed by the installer by accessing the Boost Temperature

 

parameter. The temperature range of this parameter is 0°F

This parameter allows the installer to enable or disable the SH

(0°C) to 25°F (14°C). The default value is 0°F (0°C). This

ramp delay. The default setting is disabled.

feature will be active if this parameter is set to anything

 

other than 0°F (0°C).

 

 

 

Figure 1-2Ramp Delay Interval

 

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Contents Models 400 Contents Handling ceramic fiber materials Please read before proceedingNiosh stated First Aid When servicing boiler Maintenance What is in this manual?Service TroubleshootingService Near boiler pipingKnight XL display Navigation DialControl inputs LOW Voltage Connection BoardSmart Control Module Control outputsHow the boiler operates Access modesGeneral Operation How the control module operatesOperation Display From previous page Sequence of Operation Display panel menu access Button Screen Operation Display StatusDisplay panel parameter access Button Screen Status Operation DisplayParameter table Description See User Access Installer Access Display ModifyMenu Resetoutdoor ANTI-CYCLING See User Access Installer Access Display Modify DescriptionTime and Date Temperature units C / FViewable and changeable control parameters Software VersionData Logging Temperature SettingsFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Minimum On/Off Time Cascade OffsetCirculation pumps Boiler Pump Anti-Seize Delay Boiler Pump DelayDHW Pump Delay DHW 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 Check control settings Check ignition ground wiringCheck all boiler wiring Inspect ignition and flame sense electrodesReview with owner Check flame signalCleaning boiler heat exchanger Model Kit Part Component Number DescriptionTest procedure Test low water flow conditionsCheck the following TroubleshootingBefore troubleshooting Check control module fusesOperation No DisplayNo Burner Unit DoesWire Color R/BK and Y Wire Color G and Y Checking temperature sensorsTemperature Resistance Temperature Resistance Resistance TemperatureBoiler Pump NoisyNo Pump System PumpTroubleshooting Anti-cycling Temp SwOpen Flame Fail IgnCont’d Flame SequenceOutlet Arhl Outlet MrhlHigh Fan Low/HighFan Speed Low GV/RelayLouver Proving FaultSensor Shorted Inlet SensorMemory Error Flue Sensor FaultFatal Error Flue Temp DiffDelta T High Flue Temp HighOutlet Temp No Error Stored Service BlkWatch Dog Error Rem Ctrl FltCombustion 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.

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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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