State-Water-Heaters SEV-15 Electric Water Heater User Manual

State-Water-Heaters SEV-15 Electric Water Heater User Manual

GENERAL SAFETY INFORMATION

PRECAUTIONS
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDERWATER. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system that has been under water. If the unit is exposed to the following, do not operate heater until all corrective steps have been made by a qualified service agency

1. External fire.
2. Damage.
3. Firing without water.

GROUNDING INSTRUCTIONS
This water heater must be grounded in accordance with the National Electrical Code and/or local codes. These must be followed in all cases. Failure to ground this water heater properly may also cause erratic control system operation on ELECTRONIC CONTROL models. This water heater must be connected to a grounded metal, permanent wiring system, or an equipment grounding conductor must be run with the circuit conductors and connected to the equipment grounding terminal or lead on the water heater.

HYDROGEN GAS (FLAMMABLE)
Hydrogen gas can be produced in a hot water system served by this heater that has not been used for a long period of time (generally two weeks or more). Hydrogen gas is extremely flammable. To reduce the risk of injury under these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical appliance connected to the hot water system. If hydrogen is present there will probably be an unusual sound such as air escaping through the pipe as the water begins to flow. THERE SHOULD BE NO SMOKING OR OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.

INTRODUCTION

Thank You for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service. Abbreviations Found In This Instruction Manual:

• ANSI – American National Standards Institute
• ASME – American Society of Mechanical Engineers
• NEC – National Electrical Code
• NFPA – National Fire Protection Association

Preparing for the Installation

1. Read the “General Safety” section of this manual first and then the entire manual carefully. If you don’t follow the safety rules, the water heater may not operate safely. It could cause DEATH, SERIOUS BODILY INJURY AND/ OR PROPERTY DAMAGE. This manual contains instructions for the installation, operation, and maintenance of the water heater. It also contains warnings throughout the manual that you must read and be aware of. All warnings and all instructions are essential to the proper operation of the water heater and your safety. READ THE ENTIRE MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATER. General outline diagrams are in this manual. These diagrams will serve to provide the installer with a reference for basic installation of this product. IT IS NECESSARY THAT ALL THE ELECTRICAL WIRING BE INSTALLED AND CONNECTED AS SHOWN IN THE DIAGRAMS. Be sure to turn off power when working on or near the electrical system of the water heater. Never touch electrical components with wet hands or when standing in water. When replacing fuses always use the correct size for the circuit. Use same size and type of fuse when replacing.
2. The installation must conform with these instructions and the local code authority having jurisdiction and the requirements of the power company. In the absence of code requirements, follow NFPA-70 (current edition). The National Electrical Code may be ordered from: National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269.
3. If after reading this manual you have any questions or do not understand any portion of the instructions, call the toll free number on the back cover for further assistance.
4. Installation and service of this water heater requires ability equivalent to that of a licensed tradesman or qualified agency (page 2) in the field involved. Plumbing and electrical work are required.
5. Massachusetts Code requires this water heater to be installed in accordance with Massachusetts 248-CMR 2.00: State Plumbing Code and 248-CMR 5.00.

ELECTRICAL DATA

General
Check the water heater model and rating plate information against the characteristics of the branch circuit electrical supply. Do not connect the heater to an improper source of electricity. Voltage applied to the water heater should not vary more than +5% to -10% of the model and rating plate marking for satisfactory operation. Do NOT energize the branch circuit for any reason before the water heater tank is filled with water.

Doing so may cause the heating elements to fail. The installation must conform to these instructions and the local code authority having jurisdiction. Grounding and electrical wiring connected to the water heater must also conform to the National Electrical Code, NFPA 70. This publication is available from The National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269

Branch Circuit
The branch circuit wire size should be established through reference to the NEC (National Electrical Code) or other locally approved sources in conjunction with the water heater amperage rating.. Wire rated at 75°C should be used. For convenience, portions of the wire size tables from the Code are reproduced in Table 1 on page 9. It is suggested the electrician size the branch circuit at 125 percent of the heater rating and further increase wire size as necessary to compensate for voltage drop in long runs. Voltage drop should not exceed 3% at the water heater.

Heater Circuits
The water heater’s electrical components are pictured and identified in the Features and Components illustrations in Diagrams 1 and 2. The model and rating plate provides heater circuit ratings. There are two main electrical circuits: Control Circuit: Power supply for the electromagnetic contactor coils. 120V power is supplied to the contactor coils by the CCB (Central Control Board) see wiring diagrams in this manual. Power Circuit: High voltage, single or three phase, circuit that carries the heating element load. The following section and pages describe the water heater circuits and includes wiring diagrams.

Control Circuits

The water heater is equipped with an electronic control system. The system includes a CCB (Central Control Board) circuit board, an immersion temperature probe with ECO for temperature sensing and limiting, a UIM (User Interface Module) for user interface & information display and element current sensors for monitoring the power circuits. Refer to the control circuit label on the water heater for details. The CCB is powered by a small 120V/24V transformer. The control circuit operates on 120V supplied by a larger 100VA transformer.

Sequence of Operation

1. When the control is powered, the UIM should display model information, water temperature, operating setpoint, heating status and operating mode.
2. If the control determines that the actual water temperature inside the tank is below the programmed operating setpoint minus the (1st) differential setpoint, a call for heat is activated.
3. After all safety checks are verified the CCB will energize the contactor coil(s). On models with more than one heating element the upper most heating elements are energized first. Successive heating elements are energized according to programmed differential setpoints for each heating element.
4. The control remains in the heating mode until the water temperature reaches the programmed operating setpoint. At this point the contactors will be de-energized.
5. The control system now enters the standby operating mode while continuing to monitor the water temperature and the state of other system devices. If the water temperature drops below the programmed Operating Setpoint minus the (1st) differential setpoint, the control will automatically return to step 2 and repeat the heating cycle.

Power Circuit
Power circuit wiring is type THHN (or equivalent) rated 600 volts, 105°C, sized as necessary. The following wiring diagrams on page 6 are included in this manual to show typical arrangements of electrical components in the control and power circuits by voltage and phase characteristics. They are to be used as a reference by the installer or servicer in performing their work. An actual diagram of the water heater wiring is furnished with the water heater.

WWIRRINNG DDIAAGRARAMSS

DIAGRAM 1. LARGE COMMERCIAL WIRE DIAGRAM 208-240V / 3PH

DIAGRAM 2. LARGE COMMERCIAL WIRE DIAGRAM 300-600V/3PH 

TEMPERATURE REGULATION

HIGH-TEMPERATURE LIMIT CONTROLS (ECO) 
This water heater is equipped with an ECO (energy cut-off). This switch is adjustable, up to 190 degrees F. An ECO is a normally closed switch that opens (activates) on a rise in temperature. If the ECO switch contacts open (activate) due to abnormally high water temperatures the control system will lock out and disable further heating element operation. It is important that a qualified service agent be contacted to determine the reason for the ECO activation before resetting the ECO. Once the reason has been determined and corrected the ECO can be reset as follows:

When the ECO switch contacts open (activate) the electronic control system locks out and displays a Fault message. Voltage to the contactor coils and heating elements is terminated to prevent further heating operation. Should the ECO activate, the water temperature must drop below 120°F/49°C before the control system can be reset. Once the water temperature has cooled below this point the power supply to the water heater must be turned off and on again to reset the control system.

THERMOSTAT CONTROLS
The water heaters covered in this instruction manual are equipped with adjustable thermostat controls to control water temperature. Hot water temperatures required for automatic dishwasher and laundry use can cause scald burns resulting in serious personal injury and/ or death. The temperature at which injury occurs varies with the person’s age and duration of exposure. The slower response time of children, the elderly, or disabled persons increases the hazards to them.

Never allow small children to use a hot water tap or draw their own bath water. Never leave a child or disabled person unattended in a bathtub or shower. The water heater should be located in an area where the general public does not have access to set temperatures. Setting the water heater temperatures at 120°F will reduce the risk of scalds. Some States require settings at specific lower temperatures. See Figure 1 which shows the approximate time-to-burn relationship for normal adult skin.

MIXING VALVES

Water heated to a temperature that will satisfy clothes washing, dishwashing, and other sanitizing needs can scald and cause permanent injury upon contact. Short repeated heating cycles caused by small hot water uses can cause temperatures at the point of use to exceed the water heater’s temperature setting by up to 20°F (11°C). Some people are more likely to be permanently injured by hot water than others.

These include the elderly, children, the infirm, and the physically/mentally disabled. Figure 1 shows the approximate time-to-burn relationship for normal adult skin. If anyone using hot water provided by the water heater being installed fits into one of these groups or if there is a local code or state law requiring a certain water temperature at the point of use, then special precautions must be taken.

In addition to using the lowest possible temperature setting that satisfies the demand of the application a Mixing Valve should be installed at the water heater (see Figure 2) or at the hot water taps to further reduce system water temperature. Mixing valves are available at plumbing supply stores. Consult a Qualified Installer or Service Agency. Follow the mixing valve manufacturer’s instructions for the installation of the valves.

Temperature Adjustment
The water heaters covered in this instruction manual are equipped with an electronic control system. The control system senses temperature from a factory-installed immersion temperature probe. The “Operating Set Point” is adjusted to control water temperature. This is an adjustable user setting in the control system’s “Temperatures Menu.” This and all control system menus are accessed through the UIM (User Interface Module located on the front panel of the water heater.

The Operating Set Point is adjustable from 90°F/42°C to 190°F/88°C. The factory setting is 120°F/49°C. See the Control System Operation section of this manual for instructions on how to adjust the Operating Set Point and other user settings. Set the Operating Set Point at the lowest setting which produces an acceptable hot water supply. This will always give the most energy-efficient operation.

CONTROL SYSTEM OPERATION

HEATING ELEMENT OPERATION
Progressive Sequencing: Elements are energized and de-energized according to adjustable (1 to 20°F) Differential set points for each element. Element Rotation – the first element is rotated with each successive call for heat. First On/First Off – the first heating element energized at the beginning of a heating cycle is the first element de-energized at the end of the heating cycle. Successive heating cycles would progress as follows on a model equipped with 3 heating elements:

• First heating cycle: Elements come on [1, 2, 3] and cycle off [1, 2, 3].
• Second heating cycle: Elements come on [2, 3, 1] and cycle off [2, 3, 1].
• Third heating cycle: Elements come on: [3, 1, 2] and cycle off [3, 1, 2].
• Fourth heating cycle: pattern repeats – same as first.

CONTROL SYSTEM FEATURES
Advanced Diagnostics Plain English text and animated icons display detailed operational and diagnostic information. The 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.

Advanced Service menu displays a list of possible causes for current Fault and Alert conditions to aid in servicing. Economy Mode Operation Control system automatically lowers the Operating Set Point by a programmed value during user-defined time periods. Helps reduce operating costs during unoccupied or peak demand periods.

CONTROL SYSTEM NAVIGATION

The UIM (User Interface Module) is located on the front cabinet of the water heater. All operational information and user settings are displayed and accessed using the UIM. The UIM includes five snap-acting (momentary) user input buttons; an Up, Down, and 3 Operational Buttons.

Up & Down Buttons
Used to navigate (up and down) and to select (highlight) menu items. Also used to adjust or change (increase/decrease, on/off, set time) various user settings.

Operational Buttons
The 3 Operational Buttons are multifunctional. Their current function is defined by the text that appears directly above each button on the LCD screen. The function will change depending on what menu is currently displayed or what menu item is selected. When no text appears on the LCD screen above an Operational Button there is no function assigned.

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. Tank Temperature: Current water temperature as sensed from the immersion Temperature Probe. Operating Set Point: Temperature at which the control system will maintain tank (water) temperature in the Normal Mode. This line of text will read Economy Set Point whenever the control system is operating in the Economy Mode. Status: The Operating State of the control system is displayed beneath the Operating Set Point.

Menu: The left Operational Button is pressed to enter the Main Menu where all control system menus are accessed. See Table 3 on page 10 for a list of control system menus. Help: The right Operational Button is pressed to access instructions and explanations for user settings, Operating States, Status Icons, manufacturer’s web address, technical support phone number, and service agent contact information. Day/Time/Operating Mode: The current time and day are also displayed on the Desktop Screen. “Clock Not Set” will be displayed until the time clock has been initially set.

Day and Time are adjusted in the Economy Mode Setup menu. The current Operating Mode, either Normal Mode or Economy Mode, is displayed beneath the day and time. Discreet Menu Contact Information: From the Desktop Screen press and hold down the middle (unmarked) Operational Button for 30 seconds and then release it. This will launch a discreet menu where personalized contact information can be entered. Installing contractors and/or service agents can enter their company name and telephone number. This contact information will be displayed with all Fault and Alert messages.

STATUS ICONS

ICON	DESCRIPTION
	The 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. 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.
	The control is unable to initiate a heating cycle. This will happen whenever a Fault condition is detected by the control system or when either of the two Enable/Disable circuits are open circuits.
	The control system is in Heating Mode and has energized the electromagnetic contactor coils for at least one heating element. This animated icon DOES NOT indicate current has been sensed from the heating elements, only that there is a call for heat present and the control system has initiated heating element operation.
	The control has detected/declared a Fault Condition. Fault message details can be viewed in the Current Fault menu. Heating operation is discontinued (locked out) until the condition that caused the fault is corrected. Power to the water heater must be cycled off and on to reset the control system. Note; cycling power will not reset the control system if the condition that caused the fault has not been corrected.
	The control has detected/declared an Alert Condition. The water heater will continue to operate during an Alert Condition but there is an operational condition that requires the attention of a Qualified Service Agent. Alert message details can be viewed in the Current Alert menu.

OPERATING STATES

CONTROL SYSTEM MENUS

TEMPERATURES MENU

Operating Set Point
User adjustable setting 90°F to 190°F range; factory default is 120°F. When the water temperature sensed by the control system from the immersion Temperature Probe reaches the Operating Set Point the control system will end the heating cycle. A call for heat will be activated again when the water temperature drops below the Operating Set Point minus the 1st Differential Setting. Example: Operating Set Point is 120°F, the 1st Differential Setting is 2°F (factory default). A call for heat will be activated when the sensed water temperature drops to 118°F.

Differential Settings
Adjustable user setting(s) 1°F to 20° range; factory default is 2°F. The water heaters covered in this manual will have between 1 and 5 heating elements. There is at least one Differential Setting on all models. There will be additional Differential Settings for each additional heating element installed.

Operating Sequence
On a water heater equipped with 3 heating elements, with an Operating Set Point of 120°F and all Differential settings at 2°F the On/Off sequencing of heating elements would be as follows:

Tank Temperature
Non adjustable information display. Current water temperature as sensed by the control system from immersion Temperature Probe.

Tank Probe Offset
User adjustable setting -5°F to +5°F range; factory default is 0°F. If the current Tank Temperature is sensed (from the immersion Temperature Probe) at 120°F and the offset is adjusted to -5°F the control system would calibrate or “offset” the Tank Temperature to 115°F. Heating cycles would then start/stop based on the calibrated Tank Temperature. Used to calibrate for slight differences in control system temperature sensing. This can improve the precision of temperature control in storage tank and at points of use. This feature can also be used to compensate for building recirculation loops (hot water returning to storage tank) that may cause the heating cycle to terminate prematurely.

Temperature Settings

The Operating Set Point and the Differential Settings are adjusted in the Temperatures Menu. The following instructions explain how to adjust these user settings and navigate the control system menus.

ACTION	DISPLAY
From the Desktop Screen, press the Operational Button underneath “MENU” to enter the Main Menu.   Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens.
With Temperatures selected (highlight in black) in the Main Menu, press the Operational Button underneath “SELECT” to enter the Temperature Menu.   If Temperatures is not selected use the Up and Down buttons to select this menu item.
With the Operating Set Point selected (highlighted in black) in the Temperatures Menu, press the Operational Button underneath “CHANGE” to activate the adjustment mode for this menu item.
Press the Up and Down buttons to adjust the Operating Set Point to the desired setting.   Press the Operational Button underneath “UPDATE” to confirm the new setting. Press the Operational Button underneath “CANCEL” to discard the new setting and retain the previous setting.   The new Operating Set Point value should now be displayed as the current value.   NOTE: Use this same procedure to adjust the Differential settings and the Tank Probe Offset in the Temperatures Menu.   This same procedure is used to change user settings in other control system menus.

WATER HEATER STATUS MENU

This menu displays non adjustable operational information. Use the Up & Down Buttons to navigate to the bottom of this menu.

Top of Menu 

Bottom of Menu

Status Displays the current Operating State of the control system. IE: Heating, Standby, Fault. Elements On # Displays the number of heating elements the control system has energized. ECO Contact Displays the current state of the ECO high temperature limit switch contacts.

Enable / Disable 1 & 2
Displays the current state, open or closed, of the two Enable/Disable circuits (J7 socket on the CCB – see wiring diagrams on page 6) provided for external supervisory controls such as building EMS (Energy Management System). Both of these Enable/Disable circuits must be closed to “enable” heating operation. If either Enable/Disable circuit is open for any reason heating operation will be “disabled.”

There is a plug with two jumper wires installed from the factory in the CCB J7 socket to enable heating operation when external controls are not in use. Service Note: If a supervisory control(s) is used to enable/disable heating operation, install field wiring between the J7 socket on the CCB and a set of “dry contacts” on the external control per all applicable building codes. This is a switching circuit only: DO NOT apply any external voltage or connect any load (IE: relay coil) to either circuit.

ECONOMY MOzDE 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, low load, or peak demand periods.

Desktop Screen During Economy Mode

Economy Mode Setup Menu

Setpoint Adjustment
Adjustable user setting (2°F to 50°F – factory default is 20°F) the control system uses to calculate the “Economy Set Point.” The Economy Set Point = normal Operating Set Point minus the programmed Setpoint Adjustment value The Economy Set Point is the water temperature the control system maintains during programmed Economy Mode time periods. “Economy Set Point” is displayed instead of “Operating Set Point” and “Economy Mode” appears beneath the current time on the Desktop Screen during Economy Mode time periods.

Current Time
Seven Day 24 hr clock. Use this menu item to set the current time and day of the week. Current day and time are not set from the factory. “Clock Not Set” will be displayed on the Desktop until the time/day has been initially set. Note: the time will not self adjust for Daylight Savings time.

Daily Operating Mode (Sun – Mon – Tue – Wed – Thu – Fri – Sat)
Seven daily sub menus are listed at the bottom of the Economy Mode Setup menu. There are 3 Operating Modes in each sub menu; “Normal Operation All Day” – “Economy Mode All Day” and “Normal Operation Between.” Only one Operating Mode can be active, the factory default is Normal Operation All Day. Normal Operation All Day: When this operating mode is active the normal Operating Set Point is used for the entire day. Economy Mode All Day: When this operating mode is active the Economy Set Point is used for the entire day.

Normal Operation Between:
When this operating mode is active there will also be start and stop times to program. The normal Operating Set Point is used between the programmed start and stop times and the Economy Set Point will be in effect during the rest of the day. There is one start time and one stop time event per day.

ECONOMY MODE SETTINGS

Setpoint Adjustment Value

ACTION	DISPLAY
From the Desktop screen, press the Operational Button underneath “MENU” to enter the Main Menu.   Notice how the text above the Operational Buttons on the display changes as you navigate through the various menus and screens.
Use the Up/Down buttons to select (highlight in black) the Economy Mode Setup menu from the Main Menu. Press the Operational Button underneath “SELECT” to enter the Economy Mode Setup menu.
Use the Up/Down buttons to select (highlight in black) Setpoint Adjustment. Press the Operational Button underneath “CHANGE” to activate the adjustment mode for the Setpoint Adjustment value.
Use the Up/Down buttons to change the Setpoint Adjustment to the desired value. The Setpoint Adjustment value is adjustable from 2°F to 50°F. The factory default is 20°F.   Notice how the text above the Operational Buttons on the display changes to “UPDATE” & “CANCEL” when the adjustment mode is activated and how the current value is outlined rather than highlighted in black.   Press the Operational Button underneath “UPDATE” to enter and confirm the new value. Pressing the Operational Button underneath “CANCEL” would discard the new value and retain the previous value.
The new Setpoint Adjustment value should now be displayed as the current value.

Time Clock Settings 

ACTION	DISPLAY
From the Desktop Screen navigate to the Economy Mode Setup menu.   Use the Up/Down buttons to select (highlight in black) Current Time sub menu. Press the Operational Button underneath “CHANGE” to enter the Current Time sub menu.
Use the Up/Down buttons to select the “Weekday” setting.   Press the Operational Button underneath “CHANGE” to activate the adjustment mode for this setting.
Press the Up/Down buttons to adjust the Weekday setting to the current day.   Notice how the text above the Operational Buttons on the display changes to “ACCEPT” & “CANCEL” when the adjustment mode is activated and how the current setting is outlined rather than highlighted in black.   Press the Operational Button underneath “ACCEPT” to enter and confirm the new setting. Pressing the Operational Button underneath “CANCEL” would discard the new setting and retain the previous setting.
Use the Up/Down and the CHANGE/ACCEPT Operational Buttons to individually select and change the remaining time settings (Hour, Minutes, AM/PM) to the current time in the same way as outlined above.   When finished making changes press the Operational Button underneath “BACK” to confirm all new settings and update the control system. The display will automatically return to the Economy Mode Setup menu.
The new settings should be displayed as the Current Time.

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 – see wiring diagrams. Alarm output relay contacts are capable of switching 1 amp maximum at 120 VAC.

The alarm relay operates in the background according to the settings in this menu and is not capable of disabling water heater operation. The alarm relay is used for external notification/verification of various operational conditions such as fault conditions and heating mode status. This relay can be used with building EMS (Energy Management System) and other external supervisory controls.

Output Function
Adjustable user setting. Available options for the Alarm Output Function setting are: Heating Mode: Used for heating mode on/off status notification. Enable / Disable Closed: Used for notification and/or verification of the enable/disable circuits open/closed status. There are two enable/ disable circuits available for external supervisory control(s) at the J7 socket on the CCB – see wiring diagrams on page 6.

Enable/disable circuit(s) status can be viewed in the Heater Status Menu. Temp < Heater SP: Used for external notification when current tank temperature drops below Operating Set Point. Temp < Alarm SP: Used for external notification when current tank temperature drops below programmable Alarm SP. Fault or Alert: Used for external notification whenever a Fault or Alert condition is active. Fault: Used for notification whenever a Fault condition is active.

Disabled: Disables the Alarm Relay Output Function. Alarm SP Adjustable user setting (90°F to 190°F) the control system uses for the “Temp < Alarm SP” function described above. This setting has no effect with any other Alarm Output functions.

TROUBLESHOOTING CHECKLIST

Before calling for service, check the following points to see if the cause of trouble can be identified and corrected. Reviewing this checklist may eliminate the need of a service call and quickly restore hot water service.

BE SURE TO TURN OFF THE ELECTRICITY (ELECTRICAL DISCONNECT SWITCH) WHEN CHECKING EQUIPMENT.

Not Enough or No Hot Water 

1. Be certain the electrical disconnect switch serving the water heater is in the ON position. The pilot toggle switch on the cabinet should be ON. In some areas water heater electrical service may be limited by the power company. If the heater operates on a controlled circuit, heater recovery may be affected. The optional manual override switches on the cabinet front may be turned off, de-energizing the elements.
2. Check the fuses. The electrical disconnect switch usually contains fuses. The water heater has fuses located behind the cabinet front door.
3. If the water was excessively hot, and is now cold, the ECO high limit switch may have activated.
   • See the Temperature Regulation section of this manual for more information on how to reset the ECO high limit controls. Repeated activation of the ECO high limit switch should be investigated by a Qualified Service Agent.
4. The storage capacity and/or recovery rate of the water heater may have been exceeded by a large demand for hot water. Large demands require a recovery period to restore water temperature.
5. Cold incoming water temperature will lengthen the time required to heat water to the desired temperature. If the heater was installed when incoming water temperature was warm, colder water creates the effect of less hot water.
6. Sediment or lime scale may be affecting water heater operation.

Water Is Too Hot
Refer to the TEMPERATURE REGULATION section of this manual.

Water Heater Makes Strange Sounds

1. Sediment or lime scale accumulations on the elements causes sizzling and hissing noises when the heater is operating. The sounds are normal, however, the tank bottom and elements should be cleaned.
2. Some of the electrical components of the water heater make sounds which are normal ie. contactors will “Click” or snap as the heater starts and stops.

REFERENCE LINK