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Lochinvar Compact ASME 100 Series Service Handbook
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Lochinvar Compact ASME 100 Series Service Handbook

Lochinvar Compact ASME 100 Series Service Handbook

Commercial electric water heaters
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Service Handbook
COMMERCIAL ELECTRIC WATER HEATERS
COMMERCIAL ELECTRIC WATER HEATERS
Compact ASME Models
Series 100/102
INSTALLATION CONSIDERATIONS - PRE SERVICE
CHECKS - WATER HEATER CONSTRUCTION -
OPERATION & SERVICE - TROUBLESHOOTING
SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN
PRINTED 0520
100333116 2000580435B

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Summary of Contents for Lochinvar Compact ASME 100 Series

  • Page 1 Service Handbook COMMERCIAL ELECTRIC WATER HEATERS COMMERCIAL ELECTRIC WATER HEATERS Compact ASME Models Series 100/102 INSTALLATION CONSIDERATIONS - PRE SERVICE CHECKS - WATER HEATER CONSTRUCTION - OPERATION & SERVICE - TROUBLESHOOTING SERVICING SHOULD ONLY BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN PRINTED 0520 100333116 2000580435B...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS INTRODUCTION ..............3 Transformers ..............41 Qualifications - Qualified Service Agent ......3 120 VAC Transformer Wiring - 208/240/277 Volt Models ..............41 Service Warning .............3 120 VAC Transformer Wiring - 480 Volt Models ..42 Important Service Reminder ...........3 120 VAC Control Circuit Transformer Test ....43 Instruction Manual ............4 24 VAC Transformer Test ..........44...

  • Page 3: Introduction

    INTRODUCTION INTRODUCTION This service manual is designed to be an aid in servicing and troubleshooting the commercial electric water heater models listed on the cover. The instructions, illustrations and procedures contained in this manual are used to verify proper operation and to diagnose and repair common service problems. This manual does not replace or supersede the instruction manual that came with the water heater.

  • Page 4: Instruction Manual

    INSTRUCTION MANUAL Have a copy of the instruction manual that came with the water heater on hand for the correct model water heater you are working with before servicing. Installation information given in this service manual IS NOT a complete installation instruction. Installation information covered in this service manual has a limited focus as it applies to servicing.

  • Page 5: Installation Considerations

    INSTALLATION CONSIDERATIONS INSTALLATION CONSIDERATIONS Installation information given in this service manual IS NOT a complete installation instruction. Installation information covered in this service manual has a limited focus as it applies to servicing. This service manual does not replace or supersede the instruction manual that came with the water heater. Always refer to the instruction manual that came with the water heater for complete installation instructions.

  • Page 6: Electrical Requirements

    ELECTRICAL REQUIREMENTS GROUNDING Review the electrical ground requirements given in the instruction manual that came with the water heater and ensure that the water heater has been properly grounded. The water heater must be grounded in accordance with the National Electric Code and/or local codes. These codes must be followed in all cases.

  • Page 7: Pre Service Checks

    PRE SERVICE CHECKS PRE SERVICE CHECKS WIRING CONNECTIONS With the power supply to the water heater turned off ensure that the wiring connections are properly tightened to all components including: high voltage terminal blocks, fuse blocks, contactors and transformers. Loose connections at any connection point will cause increased amperage and excessive heat which can damage wiring and components.

  • Page 8: Water Heater Construction

    WATER HEATER CONSTRUCTION WATER HEATER CONSTRUCTION ELECTRONIC CONTROLS The water heaters covered in this service manual are equipped with an electronic control system. See Electronic Control System (page 58) . The control system senses temperature electrically from an immersion temperature probe. The probe is installed in a threaded opening in the storage tank (wet well) and senses water temperature directly.
  • Page 9 TEMPERATURE & PRESSURE HOT WATER RELIEF VALVE OUTLET 3/4” NPT OPENING CONTACTOR 24 V TRANSFORMER (User Interface Module) CONTROL CIRCUIT FUSES ON/OFF SWITCH 120V (Pilot Switch) CONTROL CIRCUIT TRANSFORMER HINGED ACCESS COLD WATER DOOR INLET HEATING ELEMENT (Central Control Board) Figure 1.
  • Page 10 3/4” NPT OUTLET RELIEF VALVE OPENING TOP COVER PLUGS STANDARD ANODE ROD GROUND LUG POWER DISTRIBUTION BLOCK (ONLY WHEN THERE IS MORE THAN ONE CONTACTOR) CONTROL CIRCUIT POWER CIRCUIT FUSES FUSES (OPTIONAL) CENTRAL CONTROL 120V BOARD (CCB) CONTROL CIRCUIT TRANSFORMER CONTACTOR(S) IMMERSION TEMPERATURE...

  • Page 11: Operation & Service

    OPERATION & SERVICE OPERATION & SERVICE This section of the manual will cover principles of electricity, single and three phase power, fuses, heating element construction & operation, heating element sensors, contactors, common service procedures and more. Information and service procedures presented in this section will be referenced in the troubleshooting sections at the end of this manual.

  • Page 12: Ohms Law

    OHMS LAW A law that explains the relationship between voltage, current and resistance. The law states that the electric current flowing through a conductor is equal to the voltage divided by the resistance. The following equations further explain ohms law. V = Volts (electrical pressure) A = Amps (electrical flow/current) O = Ohms (resistance to electrical flow/current)

  • Page 13: Single And Three-Phase Power

    SINGLE AND THREE-PHASE POWER These water heaters can be factory ordered for standard: 277/208/240/480 volt power. 277 volt models are single phase only - other voltages may be single or three phase. FIELD CONVERSIONS Some water heaters may be converted for single or three phase power within the guidelines listed below. Follow the phase conversion instructions provided in the Instruction manual that came with the water heater.
  • Page 14 wires are “hot” with voltage present. On a 277 volt power supply one of the two wires is a “neutral” and does not have any voltage present. Check power supply voltage as follows: 1. With the power supply to the water heater turned on set the volt meter to an AC voltage range above the expected voltage (600 VAC or higher range initially).

  • Page 15: Checking Three Phase (3Ø) Power

    CHECKING THREE PHASE (3Ø) POWER A three-phase power supply will be connected to the L1, L2 and L3 terminals of the power distribution block or directly to the contactor on models equipped with a single element. All three wires are “hot” with voltage present.

  • Page 16: Fuses

    FUSES Depending on total amp draw and how they were ordered some water heaters will be equipped with power circuit fuses to protect the heating element circuits. All models will have two fuses to protect the primary winding of the 120 Volt control-circuit transformer. See Figure 1 , Figure 2 , and Figure 3 for location. Testing fuses requires an ohm meter, an AC volt meter and an insulated fuse puller.

  • Page 17: Heating Elements

    HEATING ELEMENTS HEATING ELEMENT CONSTRUCTION The water heaters covered in this manual use electric heating elements to heat water. Heating elements convert electrical energy into heat energy. Heating elements are constructed using three tubes formed into U shaped loops. The two ends of each loop are permanently fitted into the element flange.

  • Page 18: Heating Element Wiring

    HEATING ELEMENT WIRING This section will provide more detailed information on heating elements and how they are wired in single phase, three phase delta and three-phase Y configurations. See Single and Three-Phase Power (page 13) . Six- and Three-Wire Heating Elements Depending on how a water heater is ordered and factory configured it will be equipped with heating elements that have six wiring leads or three wiring leads.
  • Page 19 Single Phase Wiring - 3 Pole Contactor The illustrations below show how six-wire heating elements (page 17) are wired to three-pole contactors on water heaters connected to a single phase power supply. See Contactors (page 36) . Connection Diagram Wiring Diagram Middle pole of the three-pol contactor is not used on models...
  • Page 20 Single Phase Wiring - 4 Pole Contactor The illustrations below show how six-wire heating elements are wired to four-pole contactors on water heaters connected to a single phase power supply. See Heating Element Wiring (page 18) and Contactors (page 36) . Connection Diagram Wiring Diagram Models configured for...
  • Page 21 Three Phase Delta Wiring - 3 Pole Contactor The illustrations below show how six-wire heating elements are wired to three-pole contactors on water heaters connected to a three-phase power supply. See Heating Element Wiring (page 18) and Contactors (page 36) . Connection Diagram Wiring Diagram Three phase...
  • Page 22 Three Phase Delta Wiring - 4 Pole Contactor The illustrations below show how six-wire heating elements (page 17) are wired to four-pole contactors on water heaters connected to a three-phase power supply. See Contactors (page 36) . Models con- Connector Diagram Wiring Diagram figured for three phase...
  • Page 23 Three Phase Y Configuration - 3 Pole Contactor The illustrations below show how three wire (Y configured) heating elements (see Heating Element Wiring (page ) are wired to three-pole contactors on water heaters connected to a three-phase power supply. See Contactors (page 36) Connection Diagram Wiring Diagram...

  • Page 24: Heating Element Ratings

    HEATING ELEMENT RATINGS There are six “standard” heating element kW ratings used; 3, 6, 9, 12, 15 and 18 kW. Heating element flanges are stamped with the part number, voltage and kW rating - see Figure 18 . Figure 18. Heating Element Flange HEATING ELEMENT CONFIGURATIONS The table below shows standard heating element configurations used.

  • Page 25: Heating Element Amperage

    HEATING ELEMENT AMPERAGE Heating Element Amperage - Six Wire Elements The table below shows the approximate amp draw through each loop of a six-wire heating element. See Heating Element Wiring (page 18) . First determine the actual rated wattage and voltage of the element being tested. See Heating Element Ratings (page 24) .
  • Page 26 Heating Element Amperage Test This test should be considered as a first diagnostic procedure for the common service complaints of no hot water or not enough hot water. The heating element amperage test shown on this page is the best procedure to quickly determine which (if any) heating elements are not working properly.
  • Page 27 Measuring amperage on an electric heating element. Make sure the jaws of the AC amp meter are clamped around ONLY ONE WIRE from each heating element at a time. Take 3 amp readings; one for each heating element loop/wire. The three readings should be approximately the same.

  • Page 28: Heating Element Voltage

    HEATING ELEMENT VOLTAGE Heating Element Voltage Test This test is typically performed after an amperage test has determined one or more heating elements (or heating element loops) is not drawing the correct amperage. See Heating Element Amperage Test (page 26) . There are five standard element/contactor wiring configurations for the water heaters covered by this manual.
  • Page 29 Heating Element Voltage Test (cont) Figure 13 A. Single Phase Power - 3 Pole Contactor - Six Wire Element. (See 1. Measure and record voltage to all three heating element loops between the first and third lower terminals of the contactor - L1 & L2. Note: All three element loops are wired to the first and third lower terminals on the contactor.

  • Page 30: Heating Element Resistance

    Service Notes: • If the voltage is low or not present in any of the tests above - check power to the water heater. See Single and Three-Phase Power (page 13) • Check fuses. See Fuses (page 16) . • Ensure heating element power circuit wiring is correct (see wiring diagram on water heater) ensure all wiring and connections are tight and making good contact.
  • Page 31 Heating Element Resistance & Ground Tests This is a two part test. In the first test the actual resistance (ohms) of each heating element loop is measured. In the second part of this test each heating element loop is tested for any continuity to ground to ensure that the heating element is not shorted to ground.

  • Page 32: Heating Element Ground Test

    See additional images, illustrations and information in Heating Element Construction (page 17) and the Six and Three Wire Heating Elements sections in Heating Element Wiring (page 18) . HEATING ELEMENT GROUND TEST 1. Secure power to the water heater at the main breaker or disconnect switch. 2.

  • Page 33: Replacing Heating Elements

    REPLACING HEATING ELEMENTS 1. Secure power to the water heater at the main breaker or disconnect switch. 2. Verify with an AC volt meter that there is not any voltage present at the power distribution block and contactors inside the water heater. See Figure 1 , Figure 2 , and Figure 3 for the location and Single and Three-Phase Power (page for power supply test procedures.

  • Page 34: Heating Element Sensors

    HEATING ELEMENT SENSORS The water heaters covered in this manual monitor heating elements using element sensors. Each element sensor monitors all the three loops of a heating element. See Heating Element Construction (page 17) and Heating Element Wiring (page 18) .
  • Page 35 The current sensors require approximately 3 AC amps minimum to activate. An active signal from a current sensor only indicates the minimum current has been sensed, it DOES NOT indicate the amount or level of current is correct for a given heating element/loop. As explained on the previous page element sensors are an assembly that contain three individual current sensors.

  • Page 36: Contactors

    CONTACTORS This section of the manual provides information on how contactors are constructed, how they work and how to test contactor operation - see pages 8 & 9 for location. CONTACTOR CONSTRUCTION - HOW THEY WORK Magnetic contactors are used to energize and de-energize the heating elements. The water heaters covered in this manual are equipped with either three-pole or four-pole contactors the illustrations below show a three-pole contactor.

  • Page 37: Contactor Configurations

    CONTACTOR CONFIGURATIONS Depending on how the water heater was configured in the factory there will be two types of contactors used; three-pole and four-pole contactors. The illustrations below show the five standard contactor configurations. There are more detailed heating element connection/wiring diagrams for these standard configurations in Heating Elements (page 17) .

  • Page 38: Contactor Inspection

    CONTACTOR INSPECTION A thorough visual inspection of the contactors should be performed as part of any regular maintenance program and whenever the water heater is being serviced. Refer to the listed Steps and images below for this procedure. 1. Secure power to the water heater at the main breaker or disconnect switch. 2.

  • Page 39: Contactor Coil Voltage Test - At Contactor

    CONTACTOR COIL VOLTAGE TEST - AT CONTACTOR This test procedure will measure contactor coil voltage at the contactor. 1. Ensure tank temperature is less than 100°F/38°C - dump water to lower tank temperature if necessary. 2. Adjust the temperature settings to ensure a call for heat is active for all heating elements. Raise the Operating Set Point to 140°F or higher.

  • Page 40: Contactor Coil Voltage Test - At Ccb

    CONTACTOR COIL VOLTAGE TEST - AT CCB This test procedure will measure contactor coil voltage where it originates at the J4 & J17 wiring terminals on the CCB. See Central Control Board (CCB) (page 52) for the CCB’s J4 wiring terminal location. 1.

  • Page 41: Transformers

    TRANSFORMERS This section of the manual provides information on how to check wiring and test the multiple tap 120 VAC control-circuit transformer and the 24 VAC transformer. See Figure 1 , Figure 2 , and Figure 3 for location of the transformers.

  • Page 42: 120 Vac Transformer Wiring - 480 Volt Models

    120 VAC TRANSFORMER WIRING - 480 VOLT MODELS This is a multiple or “multi” tap transformer that can accept 2 different input voltages to it’s primary winding. This transformer outputs 120 VAC power from it’s secondary winding which powers the CCB and the contactor coils.

  • Page 43: Vac Control Circuit Transformer Test

    120 VAC CONTROL CIRCUIT TRANSFORMER TEST 1. Ensure the main breaker or disconnect switch is turned on. 2. Verify with an AC volt meter that proper voltage is present at the power distribution block or the contactor on single element models. (See Figure 1 , Figure 2 , and Figure 3 and Single and Three-Phase Power (page 13) . 3.

  • Page 44: 24 Vac Transformer Test

    24 VAC TRANSFORMER TEST 1. Ensure the main breaker or disconnect switch is turned on. 2. Verify with an AC volt meter that proper voltage is present at the power distribution block or the contactor on single element models. (See Figure 1 , Figure 2 , and Figure 3 for the location and Single and Three-Phase Power (page 13) 3.

  • Page 45: Immersion Temperature Probe

    IMMERSION TEMPERATURE PROBE This section of the manual provides information on how test the immersion temperature probe. See Figure 1 , Figure 2 , and Figure 3 for location. The immersion temperature probe contains the ECO (energy cut out) and a Temperature Sensor.

  • Page 46: Temperature Sensor Resistance Test

    TEMPERATURE SENSOR RESISTANCE TEST 1. Secure power to the water heater at the main breaker or disconnect switch. 2. Unplug the J5 plug from the CCB (see Central Control Board (CCB) (page 52) ) for the location. 3. Using an ohm meter: set the ohm meter range to a scale above 30,000 ohms initially. 4.

  • Page 47: Temperature Sensor Dc Voltage Test

    TEMPERATURE SENSOR DC VOLTAGE TEST 1. Ensure the main breaker or disconnect switch is turned on. 2. Verify the CCB has the correct input voltage at the J2 socket and is properly grounded - perform the Checking Power and Ground to The CCB (page 56) 3.

  • Page 48: Eco Voltage Test

    ECO VOLTAGE TEST 1. Ensure the main breaker or disconnect switch is turned on. 2. Verify the CCB has the correct input voltage at the J2 socket and is properly grounded - perform the Checking Power and Ground to The CCB (page 56) 3.

  • Page 49: Low Water Cut Off (Lwco)

    LOW WATER CUT OFF (LWCO) The water heaters covered in this manual are equipped with a LWCO (low water cut off) safety device. The control system monitors a LWCO probe (see the images below) constantly to ensure that the water level inside the water heater remains at or above the level where the probe is installed.

  • Page 50: Powered Anode Rod

    POWERED ANODE ROD All of the water heaters covered in this manual are equipped with a standard anode rod. Some of the water heaters covered in this manual are also equipped with a powered anode rod. See pages 8 & 9 for location. Both types of anode rods are designed to reduce tank corrosion (rusting) that naturally occurs when water comes into contact with steel.

  • Page 51: Electronic Controls

    ELECTRONIC CONTROLS ELECTRONIC CONTROLS This section of the manual covers the electronic controls. The control system includes a CCB (Central Control Board), a UIM (User Interface Module) and a Button Pad Overlay. The control system constantly monitors and safely controls heating elements, water temperature and other functions of the water heater.

  • Page 52: Central Control Board (Ccb)

    CENTRAL CONTROL BOARD (CCB) Servicing should only be performed by a Qualified Service Technician...

  • Page 53: Ccb Socket & Wiring Terminal Identification

    CCB SOCKET & WIRING TERMINAL IDENTIFICATION Refer to the illustration (page 52) for physical location of the sockets and wiring terminals. Table 9. J1 Socket - Transformer Pin # Description 120 VAC hot to transformer Not used 120 VAC neutral to transformer 24 VAC out from transformer 24 VAC out from transformer Table 10.
  • Page 54 Table 14. J7 Socket - Enable / Disable Circuits 1 & 2 (see pages 53 & 63) Pin # Description Enable/Disable circuit 1 Enable/Disable circuit 1 Enable/Disable circuit 2 Enable/Disable circuit 2 J8 Socket - Not Used J9 Socket - Not Used Table 15.

  • Page 55: Ccb Enable/Disable Circuit(S) Test

    CCB ENABLE/DISABLE CIRCUIT(S) TEST The electronic control system includes two enable/disable circuits (see page 63) for use with field installed supervisory controls such as building EMS (Energy Management System). These two circuits are located at the CCB’s four pin J7 Socket. Both of these Enable/Disable circuits must be closed to enable heating operation.

  • Page 56: Checking Power And Ground To The Ccb

    CHECKING POWER AND GROUND TO THE CCB The CCB is powered by the120 VAC control-circuit transformer (see pages 39 - 41) at the J2 Socket, pins 1 & 3 (see Central Control Board (CCB) (page 52) ). This procedure is performed to ensure that the120 VAC power is being supplied to the CCB.

  • Page 57: Uim - User Interface Module

    UIM - USER INTERFACE MODULE The UIM’s major components include a Circuit Board with LCD display and a Button Pad Overlay which contains the five user input buttons. Service Note: The Ribbon Cable that connects the Button Pad Overlay to the UIM Circuit Board must be plugged in exactly as shown in the images below;...

  • Page 58: Electronic Control System

    ELECTRONIC CONTROL SYSTEM HEATING ELEMENT OPERATION Depending on tank size and how they were ordered from the factory the water heaters covered in this manual may be equipped with 1 to 5 electric heating elements. See Heating Element Construction (page 17) . The illustration here shows how the heating elements are numbered and initially cycled on by the control system - top to bottom.

  • Page 59: Control System Features

    CONTROL SYSTEM FEATURES Advanced Diagnostics Plain English text and animated icons display detailed operational and diagnostic information. LCD screen on the front of the water heater displays the Sequence of Operation in real time. Fault or Alert messages are displayed when operational problems occur - see pages 76 - 80. An Advanced Service menu displays a list of possible causes for current fault and alert conditions to aid in servicing.

  • Page 60: The Desktop Screen

    THE DESKTOP SCREEN The illustration below shows the control system “Desktop Screen.” This is the default screen. If there are no active Fault or Alert conditions and no user input for approximately 10 minutes the control system will return to this screen automatically. Model Information: Model information and menu titles are shown in the black bar at the top of the Desktop Screen.
  • Page 61 Table 17. Status Icons Icon Description Water temperature in the tank has fallen. Shaded area of the animated thermometer icon will rise and fall in response to water temperature in the storage tank as sensed from the immersion Temperature Probe. Water temperature in the tank has reached the Operating Set Point.
  • Page 62 Table 18. Operating States State Description Standby The water heater is not in an active heating cycle. This usually indicates the tem- perature in the tank has reached the Operating Set Point and the control system has terminated the heating cycle. Heating The control system is in the Heating Mode.

  • Page 63: Temperatures Menu

    TEMPERATURES MENU Operating Set Point Temperatures User adjustable setting 90°F to 190°F range; factory 120°F Operating Set Point default is 120°F. When the water temperature sensed 1st Differential 2°F 2nd Differential 2°F by the control system from the immersion Temperature 3rd Differential 2°F Probe reaches the Operating Set Point the control...

  • Page 64: Temperature Settings

    TEMPERATURE SETTINGS The Operating Set Point and the Differential Settings are adjusted in the Temperatures Menu (page 63) . The following instructions explain how to adjust these user settings and navigate the control system menus. Table 21. Temperature Settings Menu Action Display From the Desktop Screen, press the Operational Button...

  • Page 65: Heater Status Menu

    HEATER STATUS MENU This menu displays non adjustable operational information. Use the Up & Down Buttons to navigate to the bottom and top of this menu. Status Top Of Menu Displays the current Operating State of the control Heater Status system.

  • Page 66: Economy Mode Setup Menu

    ECONOMY MODE SETUP MENU This menu contains settings used to establish an “Economy Set Point” and “Economy Mode” operating periods. This control system feature can help reduce operating costs during unoccupied or low demand periods. Setpoint Adjustment Desktop Screen Stand-by Mode MODEL INFORMATION Adjustable user setting (2°F to 50°F - factory default Tank Temperature...
  • Page 67 Table 22. Setpoint Adjustment Value Action Display From the Desktop screen, press the Operational Button underneath “MENU” to enter the Main Menu. (see Control System Navigation (page 59)). Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens.
  • Page 68 Table 22. Setpoint Adjustment Value Action Display The new Setpoint Adjustment value should now be Economy Mode Setup displayed as the current value. Setpoint Adjustment Current Time Wed 4:19 PM Heater In Economy Mode Normal All Day Normal All Day Normal All Day Normal All Day CHANGE...
  • Page 69 Table 23. Time Clock Settings Action Display Use the Up/Down and the CHANGE/ACCEPT Current Time Operational Buttons to individually select and change the remaining time settings (Hour, Minutes, AM/PM) to Weekday: Monday the current time in the same way as outlined above. Time: 5:00 PM When finished making changes press the Operational...
  • Page 70 Table 24. Daily Operating Mode Setting ACTION DISPLAY Use the Up/Down buttons to select (highlight in black) Sunday the “Economy Mode All Day” setting. Press the Operational Button underneath “SELECT” Normal Operation All Day to change from the factory default Normal Operation Economy Mode All Day Normal Operation Between: All Day setting to the Economy Mode All Day setting.

  • Page 71: Alarm Output Setup Menu

    ALARM OUTPUT SETUP MENU Permits user to set the condition (from a list of options) for when the CCB’s integral alarm output relay will be energized. Alarm relay connections (common, normally open, normally closed) are located on the J3 terminal strip on the CCB (page 52) .

  • Page 72: Display Settings Menu

    DISPLAY SETTINGS MENU Permits user to set display options for viewing information on the UIM’s LCD screen. Temperature Units Display Settings Adjustable user setting that changes temperature Temperature Units ºF units display to Celsius °C or Fahrenheit °F. Backlight Delay Contrast Backlight Delay Adjustable user setting that determines how long the...

  • Page 73: Heater Information Menu

    HEATER INFORMATION MENU This menu displays non adjustable operational information. Elapsed Time Top Of Menu Total accumulated time the control system (water Heater Information Elapsed Time heater) has been energized. 7 days 18 hrs 35 mins Total Heating Time Total Heating Time 2 days 46 mins Total accumulated time the control system has been Cycle Count...

  • Page 74: Current Fault / Alert Menu

    CURRENT FAULT / ALERT MENU This menu displays non adjustable operational information. With the Fault History sub menu selected in Main Menu; press the Operational Button underneath “SELECT” to display the current Fault or Alert message. If there is not a Fault or Alert condition currently active “(none)” is displayed to the right of this menu. Fault History Menu Main Menu - Current Fault Selected This menu displays non adjustable operational...

  • Page 75: Restore Factory Defaults Menu

    RESTORE FACTORY DEFAULTS MENU This control system menu allows the user to restore most of the control system’s user settings to their factory default settings. User settings in the Alarm Output Setup and Display Settings menus are unaffected by executing Restore Factory Defaults. Table 25.

  • Page 76: Troubleshooting

    TROUBLESHOOTING TROUBLESHOOTING COMMON SERVICE PROBLEMS NO HOT WATER 1. Hot water supply valve to fixtures turned off; cold water supply valve to water heater turned off. 2. Check power to the water heater. See Single and Three-Phase Power (page 13) . 3.

  • Page 77: Control System Diagnostics

    CONTROL SYSTEM DIAGNOSTICS FAULT CONDITIONS When the control system declares a fault condition it will display a fault message on the UIM and lock out. Voltage to the contactor coils and heating elements is terminated to prevent further heating operation. ALERT CONDITIONS When the control system declares an alert condition it will continue heating but will display an alert message on the UIM notifying the user that the water heater requires servicing.
  • Page 78 Table 27. Control System Unresponsive DISPLAYED MESSAGE CONDITION/INDICATES CHECK/REPAIR Heating Cycle Disabled • Check for and correct any active Fault condition. See Current Fault / Alert Menu (page 74) . Control System not activating call for heat with cold • Check enable/disable circuits - ensure both circuits tank of water.

  • Page 79: Fault And Alert Messages

    FAULT AND ALERT MESSAGES Troubleshooting procedures for the most common Fault and Alert messages are covered in this section. In the tables that follow the first column shows the Fault or Alert message as displayed by the UIM along with an explanation.
  • Page 80 Table 28. FAULT AND ALERT MESSAGES Displayed Message Condition/Indicates Check/Repair “Temp Probe Open” (Fault Condition) • Check the J5 plug/socket connections at the CCB ensure they are mating properly and providing good The control system has detected an open circuit contact.
  • Page 81 Table 28. FAULT AND ALERT MESSAGES Displayed Message Condition/Indicates Check/Repair “Energy Cut Out (ECO)” (Fault Condition) • Check the J5 plug/socket connection at the CCB ensure they are mating properly and providing good The control system has detected excessive contact. Check the pins inside the J5 plug/socket for water temperature inside the water heater.

  • Page 82: Lwco Fault

    Table 28. FAULT AND ALERT MESSAGES Displayed Message Condition/Indicates Check/Repair “LWCO Fault” (Fault Condition) • Ensure the water heater is full of water. Follow the filling instructions in the maintenance section of instruction The control system has detected a low water manual that came with the water heater.
  • Page 83 Table 28. FAULT AND ALERT MESSAGES Displayed Message Condition/Indicates Check/Repair “No Anode Current” • Ensure the water heater is full of water. Follow the filling “Low Anode Protection” instructions in the maintenance sec- tion of instruction “No Anode Voltage” (Alert Condition) manual that came with the water heater.

  • Page 84: Error/Fault Codes

    ERROR/FAULT CODES ERROR/FAULT CODES Table 29. Error/Fault Codes Basic Fault Description/Trou- Fault Code Fault Name bleshooting Advanced Fault Explanation/Troubleshooting 007, 00E, 00F, Hardware Failure Internal control failures have been de- Cycle power to the water heater. If the problem persists, 010, 011, 015, tected.
  • Page 85 Table 29. Error/Fault Codes Basic Fault Description/Trou- Fault Code Fault Name bleshooting Advanced Fault Explanation/Troubleshooting Anode Shorted The Powered Anode is shorted to earth The controller has detected a low resistance or short to earth ground or the tank. ground or the tank Possible Causes: 1.
  • Page 86 NOTES NOTES Servicing should only be performed by a Qualified Service Technician...
  • Page 87 NOTES NOTES Servicing should only be performed by a Qualified Service Technician...
  • Page 88 300 Maddox Simpson Parkway Lebanon, TN 37090 Phone: 615-889-8900 • Fax: 615-547-1000 www.Lochinvar.com Copyright © 2020 Lochinvar, LLC. All rights reserved. Servicing should only be performed by a Qualified Service Technician...

This manual is also suitable for:

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