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100378581_2000810301_Rev C
TM
Service Manual
Models: KEB0015 - KEB0150
2000668360 00
⚠
This manual must only be
WARNING
used by a qualified heating
installer / service technician.
Read all instructions, including
®
this manual and the Lectrus
Installation
and
Operation
Manual,
before
installing.
Perform steps in the order given.
Failure to comply could result in
severe personal injury, death, or
substantial property damage.
Save this manual for future reference.
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Summary of Contents for Lochinvar LECTRUS KEB0015
- Page 1 100378581_2000810301_Rev C Service Manual Models: KEB0015 - KEB0150 2000668360 00 ⚠ This manual must only be WARNING used by a qualified heating installer / service technician. Read all instructions, including ® this manual and the Lectrus Installation Operation Manual, before installing.
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Page 2: Table Of Contents
Contents 2. MAINTENANCE CONTENTS ............... 2 Maintenance and Annual Startup ........ 31-36 Hazard Definitions .............. 2 3. TROUBLESHOOTING PLEASE READ BEFORE PROCEEDING ..... 3 Before Troubleshooting ............ 37 Handling Ceramic Fiber Materials ........3 Check Control Module Fuses .......... 37 When servicing boiler ........... -
Page 3: Please Read Before Proceeding
Service Manual Please read before proceeding ⚠ When calling or writing about the boiler Installer – Read all instructions, including WARNING NOTICE – Please have the boiler model and serial this manual and the Lectrus Installation number from the boiler rating plate. and Operation Manual, before installing. -
Page 4: When Servicing Boiler
Service Manual Please read before proceeding When servicing boiler – • To avoid electric shock, disconnect electrical supply before performing maintenance. • To avoid severe burns, allow boiler to cool before performing maintenance. Boiler operation – • Do not block flow of ventilation air to the boiler. •... -
Page 5: What Is In This Manual
Service Manual What is in this manual? Service Maintenance Near boiler piping • Service and maintenance schedules • Address reported problems • Typical system components • Inspect boiler area and boiler interior • Check all piping for leaks The Lectrus display •... -
Page 6: Service Near Boiler Piping
Service Manual Service Near boiler piping This piping reference is included to specify the Near Boiler Piping specific to the Lectrus. This piping scheme is important for proper operation of the SMART SYSTEM control. See the Lectrus Installation and Operation Manual for more detailed piping diagrams. -
Page 7: The Lectrus Display
Service Manual Service (continued) The Lectrus display DRIVE RESET SWITCH CONNECTION RIGHT SELECT KEY LEFT 2000668360 00 SELECT KEY NAVIGATION DIAL The information on the bottom of the display shows the functions of the two SELECT keys (on either corner), and the NAVIGATION dial (in the center): MENU = Left SELECT Key SHDN = Right SELECT Key... -
Page 8: Control Inputs
Service Manual Service Service Control inputs SYSTEM PUMP SPEED CONTROL DHW THERMOSTAT ROOM THERMOSTAT / CONNECTION FLOW SWITCH BOARD 2000810819 00 SYSTEM SUPPLY SENSOR OUTDOOR SENSOR SEQUENCER / BUILDING MANAGMENT SYSTEM EXTERNAL LOW WATER CUTOFF INLET TEMPERATURE SENSOR OUTLET TEMPERATURE / HI-LIMIT SENSOR 2000810819 00 SMART CONTROL... -
Page 9: Control Outputs
Service Manual Service Service (continued) Control outputs ALARM BELL CONNECTION BOARD RUN TIME CONTACTS 2000810819 00 BUILDING MANAGEMENT SYSTEM BOILER PUMP SYSTEM PUMP DHW PUMP 2000810819 00 2000811873 00 2000811873 00 2000811873 00 2000811873 00 2000811873 00 SMART CONTROL MODULE 2000811873 00 CONTACTOR 2000811873 00... -
Page 10: General Operation
Service Manual Service Service General Operation Access modes How the boiler operates User The Lectrus uses an electronic control modules to fully control The user can adjust the date and time, enable/disable vacation the heating elements that transmit heat to water. Upon a call mode, select the temperature units, and change the display for heat, the SMART SYSTEM will evaluate the amount of contrast. - Page 11 Service Manual Service (continued) Table 1-1 Sequence of Operation OPERATION DISPLAY 1. Standby. 2. Upon a call for space heat. 3. The controls turn on the appropriate pumps, the flow switch and LWCO must close. 4. The unit goes in “WATER CHECK” mode. 5.
- Page 12 Service Manual Service Table 1-1 (continued from previous page) Sequence of Operation OPERATION DISPLAY 6. The unit goes in “RUN” mode. 7. If the space heating call is active, and the thank thermostat or sensor starts a DHW call for heat, the boiler will switch to the DHW mode.
- Page 13 Service Manual Service Table 1-1 (continued from previous page) Sequence of Operation OPERATION DISPLAY 11. Then the unit will go into an Anti-cycling mode to prevent it from being re-enabled too fast. 12. Any pumps that are running will continue to run for their respective pump delay times before turning OFF unless programmed to remain continuously ON.
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Page 14: Display Panel Menu Access
Service Manual Service Service (continued) Display panel menu access Table 1-2 Use this procedure to access menus from the display panel SCREEN BUTTON OPERATION DISPLAY STATUS Press and hold the LEFT SELECT soft key [MENU] [MENU] for five (5) seconds. Rotate the NAVIGATION dial clockwise until 5 is displayed (first digit on the left). -
Page 15: Display Panel Parameter Access
Service Manual Service Service Display panel parameter access Table 1-3 This is a typical example of accessing a parameter, shown for parameter Temperature Settings, MIN SH Setpt SCREEN BUTTON OPERATION DISPLAY STATUS This example shows how to access parameter Temperature Settings. The first display shown is at the beginning of the menu listings, after entering the installer access code. - Page 16 Service Manual Service (continued) Display panel parameter access (cont.) Table 1-3 This is a typical example of accessing a parameter, shown for parameter Temperature Settings, MIN SH Setpt SCREEN BUTTON OPERATION DISPLAY STATUS This example shows how to access parameter Temperature Settings. The first display shown is at the beginning of the menu listings, after entering the installer access code.
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Page 17: Parameter Table
Service Manual Service Parameter table Table 1-4 This table lists SMART SYSTEM control module parameters and where to access them Installer Menu Description User Access Page Access Vacation mode Time & Date Software version Temperature unit Space heat night setback offset DHW night setback offset Display Timeout Display Contrast... - Page 18 Service Manual Service Service (continued) Parameter table Table 1-4 (continued from previous page) This table lists SMART SYSTEM control module parameters and where to access them Installer Menu Description User Access Page Access Outdoor Low Outdoor high Setpoint at low output Setpoint at high output Outdoor shutdown Outdoor differential...
- Page 19 Service Manual Service Parameter table Table 1-4 (continued from previous page) This table lists SMART SYSTEM control module parameters and where to access them Installer Menu Description User Access Page Access Modbus/BACnet BAS Timeout System pump delay Space heat pump delay Hot water pump delay System pump anti-seize Boiler pump anti-seize...
- Page 20 Service Manual Service (continued) Parameter table Table 1-4 (continued from previous page) This table lists SMART SYSTEM control module parameters and where to access them Installer Menu Description User Access Page Access Time & date Cascade address BMS type Rate at minimum voltage Rate at maximum voltage Volt for minimum rate Volt for maximum rate...
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Page 21: Viewable And Changeable Control Parameters
Service Manual Service Viewable and changeable control parameters NOTE: The DHW night setback will not work without a tank Before changing parameters, note the CAUTION settings so that the unit can be returned to sensor installed. its original operating parameters. The installer may adjust the space heating night setback offset General by accessing the SH Night Setback Offset parameter and the... - Page 22 Service Manual Service (continued) Night Setback Override Offset Set Point Any Night Setback On trigger currently active or scheduled The SH offset sets how many degrees above set point the within the next seven (7) days can be skipped. To skip a trigger, temperature has to go before the boiler will shut off.
- Page 23 Service Manual Service Manual reset high limit Freeze Protection Boiler Differential Once the boiler is on due to a low inlet temperature, the inlet The smart control contains a manual reset high limit (MRHL) temperature must increase by this amount before the boiler on the outlet of the boiler.
- Page 24 Service Manual Service (continued) DHW/SH Switching Time Tank Minimum Set Point When a boiler has a DHW demand and it receives a space This setting controls the minimum tank set point for the tank heating demand, the SMART SYSTEM control will start a temperature.
- Page 25 Service Manual Service Figure 1-1 Outdoor Air Reset Curve SET POINT AT LOW OUTDOOR TEMPERATURE (SH) SET POINT SET POINT AT HIGH OUTDOOR TEMPERATURE HIGH OUTDOOR TEMPERATURE LOW OUTDOOR TEMPERATURE Set Point at Low Outdoor Temperature Outdoor Air Shutdown When the outdoor air temperature drops to the Outdoor When the outdoor temperature rises above this point, the Low parameters, the calculated set point will be at this setting control will block the SH demand (DHW demands will still...
- Page 26 Service Manual Service (continued) Anti-Cycling Boost Temperature If an SH demand lasts longer than the programmed time delay Anti-Cycling Time setting and there have been no DHW demands, the control will Once the boiler turns off, a set amount of time must elapse increase the water temperature set point by the amount in this before the control will respond to a new demand.
- Page 27 Service Manual Service Ramp Settings Maximum Cascade Set Point This parameter determines the set point used by the individual Please note that the brackets ([]) denote NOTICE boilers in a Cascade when a system sensor is connected to screen status. the Leader boiler.
- Page 28 Service Manual Service (continued) Alternate Leader The other Cascade divider method is Efficiency Optimization, designated as EFF in the menu. This method is used, as the This parameter allows the Member 1 boiler to automatically name implies, when it is desired to have the most efficient assume control of the Cascade should it lose communication system.
- Page 29 Service Manual Service Building Management System (BMS) Volts at Minimum When programmed for BMS control through the 0 - 10V BMS input or through ModBus/BACnet, the Volts at Minimum The set point or modulation of the boiler may be controlled parameter should be set to the minimum voltage signal sent through the 0 - 10V BMS input, BACnet, or ModBus.
- Page 30 Service Manual Service (continued) BAS T/O System Pump Type The system pump can be programmed to operate in response This is the amount of time the unit controls will wait to receive to the Room Thermostat inputs, or to run continuously until a communication string from the BMS controller before the SH demands go into Outdoor Shutdown.
- Page 31 The range for this parameter is 0 cycles to 100,000 “lochinvar”. If it does not find it, the display will ask if you cycles. The default is 50,000 cycles.
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Page 32: Maintenance
Service Manual Maintenance Maintenance and annual startup Table 2-1 Service and Maintenance Schedules Owner maintenance Service technician (see the Lectrus User’s Information Manual for (see the following pages for instructions) instructions) General: • Address reported problems • Check boiler area •... - Page 33 Service Manual Maintenance ⚠ If this boiler may be frozen, immediately shut off power to the appliance and contact the factory for further DANGER instructions. Operation when the boiler, internal pipes, or pressure relief valves are frozen, will result in internal pressure build-up and a deadly steam explosion.
- Page 34 Service Manual Maintenance (continued) ⚠ Perform start-up and checks Safety relief valves should be re-inspected WARNING AT LEAST ONCE EVERY THREE YEARS, 1. Start boiler and perform checks and tests specified in by a licensed plumbing contractor or Section 10 - Start-up of the Lectrus Installation and authorized inspection agency, to ensure Operation Manual.
- Page 35 Service Manual Maintenance Test low water flow conditions Figure 2-3 Adjust outlet isolation valve This test is to be carried out once the NOTICE Lectrus boiler is completely piped in ADJUST OUTLET with adequate water flow. Once the test ISOLATION VALVE ONLY is completed, ensure that the isolation valve is opened up to allow full water flow.
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Page 36: Troubleshooting
Service Manual Troubleshooting ⚠ Label all wires prior to disconnection when 4. The boiler is shipped with three (3) spare fuses in a plastic WARNING servicing controls. Wiring errors can cause bag inside the documentation package. improper and dangerous operation. Always disconnect power 5. - Page 37 Service Manual Troubleshooting Table 3-1 Fuse replacement chart Lectrus Model Voltage Power Lochinvar Part number 240VAC 15kW KEB0015-A 100146025 240VAC 30kW KEB0015-A 208VAC 3 Phase 15KW KEB0015-K 208VAC 3 Phase 30KW KEB0030-K 208VAC 3 Phase 45KW KEB0045-K 208VAC 3 Phase...
- Page 38 Service Manual Troubleshooting Table 3-2 Troubleshooting Chart - No Display FAULT CAUSE CORRECTIVE ACTION • Check external line switch, fuse, or breaker. - No power supplied to unit. • Check position of ON/OFF switch. Turn switch to the ON position. •...
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Page 39: Checking Temperature Sensors
Service Manual Troubleshooting (continued) Checking temperature sensors The boiler temperature sensors (inlet water, outlet water, system water, and outdoor air) are all resistance type devices. The following tables show the correct values for the sensors at various temperatures. Use an ohmmeter to read the resistance of the sensor at a known temperature. - Page 40 Service Manual Troubleshooting Table 3-4 Troubleshooting Chart FAULT DESCRIPTION CORRECTIVE ACTION • Refer to Section 3 - Hydronic Piping of the Lectrus Installation and Operation Manual for minimum flow rates. - Low water flow through the unit. Verify that the boiler and system pump are running on a call Noisy for heat.
- Page 41 Service Manual Troubleshooting (continued) Table 3-5 Troubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION • Adjust the set point of the auto reset limit to a higher setting up to a maximum of 225°F. Reference this manual for information on adjusting the temperature settings.
- Page 42 Service Manual Troubleshooting Table 3-5 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION • If 120 vac is present on a call for heat and the boiler pump is not operating, replace the pump. Outlet MRHL •...
- Page 43 Service Manual Troubleshooting (continued) Table 3-5 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION • Verify that the system is full of water and that all air has been properly purged from the system. •...
- Page 44 Service Manual Troubleshooting Table 3-5 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION • Check 120 vac supply to the power supply unit. • Check wiring connections at the low voltage terminal The power supply unit output voltage is going strip.
- Page 45 Service Manual Troubleshooting (continued) Table 3-6 Troubleshooting Chart - Check MCB Status LED STATUS CORRECTIVE FAULT DESCRIPTION ACTION BLUE ORANGE YELLOW None No fault – Unit running normally • None • Make sure the fan is connected in the triac board. The fan for the triac has a •...
- Page 46 Service Manual Troubleshooting Table 3-6 Troubleshooting Chart - Check MCB Status (continued from previous page) LED STATUS CORRECTIVE FAULT DESCRIPTION ACTION BLUE ORANGE YELLOW • Check elements for any damage. • Verify that the contactors are activating. • Verify that the fuses are in good The zero-crossing detection is in BLINK BLINK...
- Page 47 Service Manual Troubleshooting (continued) Utility dual-energy connection If the utility requires a dual energy connection for the boiler, an With the Lectrus boiler installed as the leader of the cascade, external assembly is present in the boiler to achieve this feature. the unit will be the first to start when there is a heat demand.
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Page 48: Revision Notes
Revision Notes: Revision A (PCP #3000060390 / CN #500046379) initial release. Revision B (PCP #3000061447 / CN #500047320) reflects updates to the table of contents and table 3-6. Revision C (PCP #3000061070 / CN #500046969) reflects the addition of LWCO information on page 10. 100378581_2000810301_Rev C 06/24...
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