Lochinvar 400-801 service manual Outdoor Reset

Page 21

 

 

Service Manual

 

 

 

1 Service (continued)

 

 

Outdoor Reset

Set Point (1 - 3) at Low Outdoor Temperature

The option of controlling up to three (3) different outdoor

When the outdoor air temperature drops to the Outdoor

(1 - 3) Low parameters, the calculated set point will be at

resets for low outdoor temperatures is available.

this setting (FIG. 1-1). If the outdoor air temperature drops

 

Outdoor (1 - 3) Low

further, the set point will continue to increase above this

setting. However, if SH1, SH2, and SH3 are set lower, the

When the outdoor air temperature drops to this point, the

water temperature will be limited by these set points instead.

These parameters can be changed by the installer by accessing

water temperature will be at the Set point 1 at Low Outdoor

the Set point 1 at Low Outdoor Temp 1, Set point 2 at Low

Temp 1, Set point 2 at Low Outdoor Temp 2 and Set point

Outdoor Temp 2 and Set point 3 at Low Outdoor Temp 3

3 at Low Outdoor Temp 3 parameters (FIG. 1-1). If the

parameters. The temperature range of this parameter is 68°F

outdoor air temperature drops further, the set point will

(20°C) to 180°F (82°C). The default value is 180°C (82°C).

continue to increase above this setting. This parameter can

Set Point (1 - 3) at High Outdoor Temperature

be changed by the installer by accessing the Outdoor (1-3)

Low parameter. The temperature range of this parameter is

When the outdoor air temperature rises to or above Outdoor

-39°F (-39°C) to high outdoor temperature set point. The

(1 - 3) High parameters, the calculated set point will be at this

default value is 25°F (-4°C).

setting (FIG. 1-1). These parameters can be changed by the

 

Outdoor (1 - 3) High

installer by accessing the Set point 1 at High Outdoor Temp 1,

Set point 2 at High Outdoor Temp 2 and Set point 3 at High

When the outdoor air temperature rises to or above this

Outdoor Temp 3 parameters. The temperature range of this

parameter is 68°F (20°C) to 190°F (88°C). The default value

point, the water temperature will be at the Set point 1 at High

is 70°F (21°C).

Outdoor Temp 1, Set point 2 at High Outdoor Temp 2 and

Outdoor Air Shutdown (SH1 - SH3)

Set point 3 at High Outdoor Temp 3 parameters (FIG. 1-1).

This parameter can be changed by the installer by accessing

When the outdoor temperature rises above this point, the

the Outdoor (1-3) High parameter. The temperature range

control will block all SH demands (DHW demands will still

of this parameter is low outdoor temperature set point to

be active). These parameters can be changed by the installer

104°F (40°C). The default value is 70°F (21°C).

by accessing the Outdoor Air Shutdown SH1, SH2, and SH3

 

 

parameters. The temperature range of this parameter is 32°F

 

(0°C) to 104°F (40°C). The default value is 70°F (21°C).

 

 

 

Figure 1-1Outdoor Air Reset Curve

 

 

SET POINT AT

 

LOW OUTDOOR

 

TEMPERATURE

 

(SH)

 

SET POINT

 

SET POINT AT

 

HIGH OUTDOOR

 

TEMPERATURE

 

 

HIGH OUTDOOR

 

TEMPERATURE

LOW OUTDOOR

21

TEMPERATURE

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Contents Models 400 Contents Please read before proceeding Handling ceramic fiber materialsNiosh stated First Aid When servicing boiler Service What is in this manual?Maintenance TroubleshootingNear boiler piping ServiceNavigation Dial Knight XL displayLOW Voltage Connection Board Control inputsControl outputs Smart Control ModuleGeneral Operation Access modesHow the boiler operates How the control module operatesOperation Display From previous page Sequence of Operation Button Screen Operation Display Status Display panel menu accessButton Screen Status Operation Display Display panel parameter accessDescription See User Access Installer Access Display Modify Parameter tableMenu Resetoutdoor ANTI-CYCLING Description See User Access Installer Access Display ModifyViewable and changeable control parameters Temperature units C / FTime and Date Software VersionTemperature Settings Data LoggingFunctions DHW Settings Outdoor Reset Anti-Cycling Control modes Cascade Offset Minimum On/Off TimeCirculation pumps DHW Pump Delay Boiler Pump DelayBoiler Pump Anti-Seize Delay DHW Pump Anti-Seize DelayService Notification Maintenance Maintenance and annual startup Service technicianOwner maintenance Maintenance Flue vent system and air piping Check water systemCheck expansion tank Check boiler relief valve Check all boiler wiring Check ignition ground wiringCheck control settings Inspect ignition and flame sense electrodesCleaning boiler heat exchanger Check flame signalReview with owner Model Kit Part Component Number DescriptionTest low water flow conditions Test procedureBefore troubleshooting TroubleshootingCheck the following Check control module fusesNo Burner No DisplayOperation Unit DoesTemperature Resistance Temperature Resistance Checking temperature sensorsWire Color R/BK and Y Wire Color G and Y Resistance TemperatureNo Pump NoisyBoiler Pump System PumpTroubleshooting Open Temp SwAnti-cycling Flame Fail IgnFlame Sequence Cont’dOutlet Mrhl Outlet ArhlFan Speed Low Fan Low/HighHigh GV/RelaySensor Shorted FaultLouver Proving Inlet SensorFatal Error Flue Sensor FaultMemory Error Flue Temp DiffFlue Temp High Delta T HighOutlet Temp Watch Dog Error Service BlkNo Error Stored Rem Ctrl FltCombustion Analysis Procedure Gas valve adjustment procedure ModelModels 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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