Lochinvar 400 - 801 Near boiler piping

1 Service

Service Manual

Y-STRAINER

(RECOMMENDED)

BOILER PUMP

INDIRECT

DOMESTIC

HOT WATER

TANK

SYSTEM PUMP

TO FLOOR

DRAIN

FROM

SYSTEM

DOMESTIC HOT

WATER PUMP

SYSTEM SENSOR

DIRT SEPARATOR

Near boiler piping

This piping reference is included to specify the Near Boiler Pipingspecific to the Knight XL. This piping scheme is important

for proper operation of the SMART SYSTEM control. See the Knight XL Installation and Operation Manual for more detailed

piping diagrams.

Contents

Main Service Manual Models: 400 - 801 WARNING Hazard definitions Contents DANGER WARNING CAUTION CAUTION NOTICE Please read before proceeding Handling ceramic fiber materials REMOVAL OF COMBUSTION CHAMBER LINING NIOSH stated First Aid. Please read before proceeding When servicing boiler Boiler operation Boiler water Freeze protection fluids What is in this manual? Service Near boiler piping The Knight XL display Control module inputs Near boiler piping NAVIGATION DIAL The Knight XL display LOW VOLTAGE CONNECTION BOARD SMART CONTROL MODULE Control inputs LOW VOLTAGE CONNECTION BOARD SMART CONTROL MODULE Control outputs General Operation How the boiler operates How the control module operates Sequence of operation Access modes OPERATION DISPLAY Table 1-1 (continued from previous page) Sequence of Operation Display panel menu access Display panel parameter access Table 1-4 This table lists SMART SYSTEM control module parameters and where to access them A B C D TEMPERATURE SETTINGS DATA E OUTDOOR RESET F G CIRCULATION PUMPS I H J K Viewable and changeable control parameters A: General NOTICE C: Data Logging D: Functions B: Temperature Settings E: DHW Settings F: Outdoor Reset G: Anti-Cycling H: Control modes Cascade Offset Minimum On/Off Time J: BMS I: Circulation pumps K: Service Notification Maintenance and annual startup Service technician Owner maintenance 2 Address reported problems Check all piping for leaks Inspect boiler area Inspect boiler interior Flue vent system and air piping Check water system Check expansion tank Check boiler relief valve 2 Inspect ignition and flame sense electrodes Check ignition ground wiring Check all boiler wiring Check control settings Check flame signal Review with owner Cleaning boiler heat exchanger Before troubleshooting: Check the following: Check control module fuses Table 3-1 Troubleshooting Chart - No Display FAULT CAUSE CORRECTIVE ACTION No Display No Burner Operation Unit Does Not Modulate Above 50% Checking temperature sensors S1a S3a FAULT CAUSE CORRECTIVE ACTION Table 3-4 Troubleshooting Chart - Fault Messages Displayed on Boiler Interface Gas Pressure SW Flow Switch/LWCO Blocked Drain SW APS Open Anti-cycling Flame Fail Ign Flame Sequence Auto Reset High Limit Fan Low OR Fan Speed Low GV/Relay Fail Fan High OR Fan Speed High Sensor Open Sensor Shorted Louver Proving Sw Flue Temp High Delta T High Outlet Temp High Outlet Temp High (continued) Service Blk Rem Ctrl Flt Parameters Progr Page Combustion Analysis Procedure POSSIBLE CAUSE CORRECTIVE ACTION Gas valve adjustment procedure Model 501 Model 400 Models 601 - 801