Pentair ETi 250 User manual

ETi 250® HIGH EFFICIENCY POOL HEATER
DO NOT store or use gasoline or other ammable vapors and liquids in the vicinity of
this or other appliances.
FOR
YOUR
SAFETY
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or death. Installation and service must be performed by
a qualied installer, service agency or the gas supplier.
Pentair Water Pool and Spa, Inc.
1620 Hawkins Ave., Sanford, NC 27330 •[phone] or [phone]
10951 W. Los Angeles Ave., Moorpark, CA 93021 •[phone] or [phone]
FOR YOUR SAFETY - READ BEFORE OPERATING
If you do not follow these instructions exactly, a re or explosion may result, causing property damage, personal
injury or loss of life. For additional free copies of this manual; call USA [phone]
OWNER:
Retain For
Future
Reference
Model Natural
120 / 240 VAC NATURAL GAS / PROPANE GAS
INSTALLATION AND USER’S GUIDE
FOR YOUR SAFETY - This product must be installed and serviced by authorized personnel, qualified
in pool/spa heater installation. Improper installation and/or operation can create carbon monoxide gas,
fire or explosion, and flue gases which can cause serious injury, property damage, or death. For indoor
installations, as an additional measure of safety, Pentair strongly recommends installation of suitable
Carbon Monoxide detectors in the vicinity of this appliance and in any adjacent occupied spaces.
Improper installation and/or operation will void the warranty.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone.
Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
ETi 250 NA - ASME 461112

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
2
P/N 476361 Revision A. 2/2022
Customer Service and Technical Support
Phone: [phone]
Fax: [phone]
(USA - 8 AM to 7:30 PM)
www.pentair.com
Customer Service and Technical Support

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
3
Thank you for choosing the Pentair ETi 250 High Efciency Pool and Spa Heater. With proper installation and service
of your new heating system, and correct chemical maintenance of the water will ensure years of heater operation. The
ETi 250 High Efciency heater is equipped with Pentair advanced heater technology which includes a multifunction
temperature controller to continuously monitor the heater for proper operation. ETi 250 High Efciency heaters are
designed with direct spark ignition (DSI) for on demand heat, which eliminates the need for a standing pilot.
SPECIAL INSTRUCTIONS TO OWNER: Retain this manual for future reference. This instruction manual provides operating
instructions, installation and service information for the heater. READ AND REVIEW THIS MANUAL COMPLETELY, it is
very important that the owner/installer read and understand the section covering installation instructions, and recognize
the local and state codes before installing the ETi 250 High Efciency heater. Its use will reduce service calls and chance
of injury and will lengthen product life. History and experience has shown that most heater damage is caused by improper
installation practices.
IMPORTANT NOTICES
For the installer and operator of the ETi 250 High Efciency Heater: The manufacturer’s warranty may be void if, for
any reason, the heater is improperly installed and/or operated. Be sure to follow the instructions set forth in this manual.
If you need any more information, or if you have any questions regarding to this pool heater, please contact Pentair
Water Pool and Spa Customer Support at [phone].
HEATER APPLICATION INFORMATION
The ETi 250 Heater is sold with a limited factory warranty. Pentair Water Pool and Spa high standards of excellence
include a policy of continuous product improvement resulting in your advanced technology pool and spa heater. Pentair
reserves the right to make improvements which change the specications of the heater without incurring an obligation
to update the current heater equipment.
The ETi 250 Heater is designed for the heating of chlorine, bromine or salt system swimming pools and spas. The heater
should never be employed for use as space heating boilers or general purpose water heaters. The manufacturer’s
warranty may be void if, for any reason, the heater is improperly installed and/or operated. Be sure to follow the
instructions set forth in this manual.
Warning and Safety Instructions
Warning and Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
ETi®250 High Efficiency Pool and Spa Heater
CODE REQUIREMENTS
Installation must be in accordance with all local codes and/or the latest edition of the National
Fuel Gas Code, ANSI Z223.1 and the latest edition of the National Electrical Code, NFPA 70
(US).
Installation in Canada must be in accordance with the latest CAN/CGA-B149.1 or .2 and CSA
C22.1 Canadian Electric Code, part 1.
The heater, when installed, must be electrically grounded and bonded in accordance with local
codes, or, in absence of local codes, with the National Electrical Code, ANSI/NFPA70 (US) or in
Canada in accordance with the Canadian Electric Code, part 1 as applicable.
The ETi 250 Pool Heater meets the requirements of the ASME Boiler and Pressure Vessel
Code.

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
4Warning and Safety Instructions
CONSUMER AND SAFETY INFORMATION
WARNING
The U.S. Consumer Product Safety Commission warns that elevated water temperature can be hazardous.
See below for water temperature guidelines before setting temperature.
1. Spa or hot tub water temperatures should never exceed 104° F (40° C). A temperature of 100° F (38° C) is considered
safe for a healthy adult. Special caution is suggested for young children.
2. Drinking of alcoholic beverages before or during spa or hot tub use can cause drowsiness which could lead to
unconsciousness and subsequently result in drowning.
3. Pregnant women beware! Soaking in water above 102° F (39° C) can cause fetal damage during the rst three
months of pregnancy (resulting in the birth of a brain-damaged or deformed child). Pregnant women should stick
to the 100° F (38° C) maximum rule.
4. Before entering the spa or hot tub, the user should check the water temperature with an accurate thermometer. Spa
or hot tub thermostats may error in regulating water temperatures by as much as 4° F (2.2° C).
5. Persons with a medical history of heart disease, circulatory problems, diabetes or blood pressure problems should
obtain their physician’s advice before using spas or hot tubs.
6. Persons taking medication which induce drowsiness, such as tranquilizers, antihistamines or anticoagulants should
not use spas or hot tubs.
WARNING
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the heater.
Do not use this heater if any part has been under water. Immediately call a qualified service technician to
inspect the heater and to replace any part of control system and gas control which has been under water.
1. Carbon monoxide is produced by burning fuel, including natural gas and propane.
2. Proper installation, operation and maintenance of fuel-burning appliances in the home is the most important
factor in reducing carbon monoxide poisoning.
3. Be sure that fuel burning appliances such as heaters are installed by professionals according to manufacturer’s
instructions and codes.
4. Always follow the manufacturer’s directions for safe operation.
5. Have the heating system (including vents) inspected and serviced annually by a trained service technician.
6. Examine vents regularly for improper connections, visible cracks, rust or stains.
7. Install battery-operated carbon monoxide alarms. The alarms should be certied to the requirements of the most
recent UL, IAS, CSA and IAPMO standard for carbon monoxide alarms. Test carbon monoxide alarms regularly
and replace dead batteries.
WARNING
The U.S. Consumer Product Safety Commission warns that carbon monoxide is an “invisible killer”. Carbon monoxide
is a colorless and odorless gas.

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
5
The ETi®250 High Efficiency Pool and Spa Heater is designed and manufactured to provide many years of safe and reliable
service when installed, operated and maintained according to the information in this manual. Throughout this manual, safety
warnings and cautions are identified by the “ “ symbol. Be sure to read and comply with all of the warnings and cautions.
SAFETY INFORMATION
Warning and Safety Instructions
CARBON MONOXIDE GAS IS DEADLY
READ OWNERS MANUAL COMPLETELY BEFORE OPERATING
THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE TECHNICIAN,
QUALIFIED IN POOL HEATER INSTALLATION. Some jurisdictions require that installers be licensed.
Check with your local building authority about contractor licensing requirements. Improper installation
and/or operation could create carbon monoxide gas and flue gases which could cause serious injury or
death. Improper installation and/or operation will void the warranty.
Exhaust from this pool heater contains toxic levels of carbon monoxide, a dangerous, poisonous gas you
cannot see or smell. Symptoms of carbon monoxide exposure or poisoning include dizziness, headache,
nausea, weakness, sleepiness, muscular twitching, vomiting and inability to think clearly. IF YOU
EXPERIENCE ANY OF THE ABOVE SYMPTOMS, IMMEDIATELY TURN OFF THE POOL HEATER,
LEAVE THE VICINITY OF THE POOL OR SPA AND GET INTO FRESH AIR IMMEDIATELY. THE
POOL HEATER MUST BE THOROUGHLY TESTED BY A GAS PROFESSIONAL BEFORE RESUMING
OPERATION.
EXCESSIVE CARBON MONOXIDE EXPOSURE CAN CAUSE BRAIN DAMAGE OR DEATH.
DANGER —
WARNING — FOR YOUR SAFETY
This product must be installed and serviced by a professional service technician, qualified in pool
heater installation. Some jurisdictions require that installers be licensed. Check with your local building
authority about contractor licensing requirements. Improper installation and/or operation could create
carbon monoxide gas and flue gases which could cause serious injury or death. Improper installation
and/or operation will void the warranty.
• NEVER use this pool heater indoors without specified ventilation system (and properly installed
vent pipe).
• NEVER use this pool heater in the home or in partly enclosed areas (such as garages), unless the
specified ventilation system is used. If used outdoors, install far from open windows, doors, vents
and other openings.
• Pentair strongly recommends that all vents, pipes and exhaust systems be initially and periodically
tested for proper operation. This testing can be accomplished by using a hand-held carbon
monoxide meter and/or by consulting with a gas professional.
• Pool heaters must be used in conjunction with carbon monoxide detectors installed near the pool
heater. The carbon monoxide detectors must be periodically inspected for proper operation so as
to insure continued safety. Broken or malfunctioning carbon monoxide detectors must be replaced
immediately.
WARNING — This heater is equipped with an unconventional gas control valve that is factory set at a
positive pressure of 1.4 inches wc. Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury or loss of life. Installation or service
must be performed by a qualified installer, service agency or the gas supplier. If this control is
replaced, it must be replaced with an identical control.
Do not attempt to adjust the gas flow by adjusting the regulator setting.

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
6Warning and Safety Instructions
SAFETY INFORMATION (continued)
WARNING — Risk of fire or explosion from incorrect fuel use. Do not try to run a heater set up for natural gas on propane
gas or vice versa. Only qualified service technicians should attempt to convert heater from one fuel to the
other. Do not attempt to alter the rated input or type of gas by changing the orifice. If it is necessary to convert
to a different type of gas, consult your Pentair dealer. Serious malfunction of the burner can occur which may
result in loss of life. Any additions, changes, or conversions required in order for the appliance to satisfactorily
meet the application needs must be made by a Pentair dealer or other qualified agency using factory specified
and approved parts. The heater is available for use with natural gas or propane gas only. It is not designed to
operate with any other fuels. Refer to the nameplate for the type of gas the heater is equipped to use.
• Use heater only with the fuel for which it is designed.
• If a propane gas conversion is necessary, this MUST be done by a qualified professional service
technician qualified in pool heater installation or by qualified gas supplier before the heater is operational.
WARNING — Risk of fire or explosion from flammable vapors. Do not store gasoline, cleaning fluids, varnishes, paints, or other
volatile flammable liquids near heater or in the same room with heater.
WARNING — Risk of explosion if unit is installed near propane gas storage. Propane gas is heavier than air. Consult
local codes and fire protection authorities about specific installation requirements and restrictions. Locate the
heater away from propane gas storage and filling equipment as specified by the Standard for the Storage and
Handling of Liquefied Petroleum Gases, CAN/CSA B149.2 (latest edition) or ANSI/NFPA 58 (latest edition).
WARNING — Risk of fire, carbon monoxide poisoning, or asphyxiation if exhaust venting system leaks. Only qualified
service technicians should attempt to service the heater, as leakage of exhaust products or flammable gas may
result from incorrect servicing.
WARNING — Risk of asphyxiation if exhaust is not correctly vented. Follow venting instructions exactly when installing
heater. Do not use a draft hood with this heater, as the exhaust is under pressure from the burner blower and
a draft hood will allow exhaust fumes to blow into the room housing the heater. The heater is supplied with an
integral venting system for indoor installation. Canada: In Canada, this pool heater can only be installed
outdoors or in an enclosure that is not normally occupied and has no openings directly into occupied areas.
See Page 27 - 29 for enclosure venting requirements.
CAUTION — Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and
dangerous operation. Wiring errors can also destroy the control board.
• Connect heater to 120 or 240 Volt, 60 Hz., Single Phase power only.
• Verify proper operation after servicing.
• Do not allow children to play on or around heater or associated equipment.
• Never allow children to use the pool or spa without adult supervision.
DANGER
CARBON MONOXIDE GAS IS DEADLY – Exhaust from this pool heater contains toxic levels of carbon monoxide, a dangerous,
poisonous gas you cannot see or smell.

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
7
GENERAL SPECIFICATIONS
NOTICE
• Combustion air contaminated by corrosive chemical fumes can damage the heater and will void the warranty.
• The Combination Gas Control Valve on this heater differs from most appliance gas controls which has a set
point of 1.4 in wc, and is different than other Pentair heaters. If it must be replaced, for safety reasons replace
it only with an identical gas control valve model. Ne sure the part number is the same.
• The heater’s access side panels must be in place to provide proper ventilation and to avoid water intrusion.
Do not operate the heater for more than ve (5) minutes with the side panels removed.
• This heater is certied by CSA International as complying with the Standard for Gas Fired Pool Heaters,
ANSI Z21.56/CSA 4.7, and is intended for use in heating fresh water swimming pools or spas.
• The ETi® 250 Heater is designed for the heating of chlorine, bromine or salt system swimming pools and
spas. It should NOT be used as a space heating boiler, or general purpose water heater.
• The heater should be located in an area where leakage of the heater or connections will not result in
damage to the area adjacent to the heater or to the structure. When such locations cannot be avoided, it is
recommended that a suitable drain pan, adequately drained, be installed under the heater. The pan must not
restrict air ow.
• The heater may not be installed within 5 ft. (1.5M ) of the inside surface of a pool or spa unless it is separated
by a solid fence, wall or other permanent barrier.
• In the United States, installation must be in accordance with local codes and the most recent edition of the
National Fuel Gas Code, ANSI Z223.1/NFPA-54. The Code can be obtained from: National Fire Protection
Association 1 Batterymarch Park Quincy, MA 02169 www.nfpa.org
Warning and Safety Instructions
Heater Identification Information (HIN)
To identify the heater, see rating plate on the inner front panel of the heater. There are two designators for each
heater, one is the Model Number and the other is the Heater Identication Number (HIN).
Heater Identification Number (HIN)
The following example simplifies the identification system:
1) ETi
2) Model Size : (250) : Input rating (Btu/hr)
X 1000
3) Fuel Type : NA = Natural gas
4) Construction : ASME = Commercial Model
ETI 250 NA ASME
ETi = High Eciency
FUEL TYPE =
CONSTRUCTION =
MODEL SIZE = BTU INPUT in 1000 of BTU / HR
H. I. N.
HEATER IDENTIFICATION NUMBER
ID DESIGNATOR FOR PENTAIR WATER POOL AND SPA, ETi HEATER
NA = NATURAL GAS
Example:
1 2 3 4
ASME = COMMERCIAL MODEL

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
8
Contents
Warning and Safety Information ............................................................................... 3
Important Notices ........................................................................................................................................... 3
Heater Application Information ....................................................................................................................... 3
Code Requirements........................................................................................................................................ 4
Consumer Information and Safety Information............................................................................................... 4-6
General Specifications.................................................................................................................................... 7
Heater Identification Information (HIM)........................................................................................................... 7
Contents....................................................................................................................... 8
Operation Instructions................................................................................................ 10
Operator Control Panel................................................................................................................................... 10
Menu Navigation............................................................................................................................................. 10
Operating the Heater (Temperature Settings)................................................................................................. 10
Menu............................................................................................................................................................... 11
Basic Heater Operation.................................................................................................................................. 11
Heater DSI Electronic Ignition Lighting/Operation ...................................................................................... 12
Start-Up Operation / Before You Start ....................................................................................................... 13
Putting the Heater into Service / High Altitude Requirement .............................................................. 13
Heater Operating Instructions .................................................................................................................... 14
To Turn Off Gas to the Appliance ............................................................................................................... 14
Safety Controls (Air Flow Switch, Water Pressure Switch, High Limit Shut-Off Switch) .............................. 15-16
(Stack Flue Sensor (SFS), Thermal Fuse, Float Switch)
Ignition Module Operation / Flame Current Check Point / Diagnostic LEDs .................................................. 16
Installation ................................................................................................................... 17
Heater Description.......................................................................................................................................... 17
Putting the Heater into Service....................................................................................................................... 17
Sequence Of Operation.................................................................................................................................. 18
Specifications ................................................................................................................................................. 18-19
Plumbing Connections.................................................................................................................................... 20
Water Connections ......................................................................................................................................... 20
Multiple Heater Connections .......................................................................................................................... 21
Valves............................................................................................................................................................. 22
Manual By-Pass ............................................................................................................................................. 22
Automatic By-Pass ......................................................................................................................................... 22
Below Pool Installation ................................................................................................................................... 23
Gas Connections....................................................................................................................................................... 23
Gas Pipe Sizing / Gas Pipe Escutcheon ................................................................................................... 24
Gas Pressure Testing..................................................................................................................................... 25
Checking Gas Pressure Through Gas Control Valve ..................................................................................... 25
Sediment Traps .............................................................................................................................................. 26
Outdoor Installation (US and Canada) ........................................................................................................... 27-28
Outdoor Installation Venting Guidelines .................................................................................................... 29
Heater Clearances - Outdoor .................................................................................................................... 29
Indoor Venting — General Requirements (Category IV Vertical and Horizontal requirements) .................... 30
Heater Clearances — General Requirements (Indoor and Outdoor Installation for US and Canada) ........ 30
Direct Air Intake Cover ................................................................................................................................... 30
Combustion Air Supply ................................................................................................................................... 31
Air Supply Requirements Guide for the ETi 250 Heater............................................................................. 31
Direct Air Intake Exhaust Duct using 4-inch PVC Pipe (Indoor Installation)............................................... 32
Direct Air Intake Kit Installation (Combustion Air Supply)........................................................................... 33
Corrosive Vapors and Possible Causes ......................................................................................................... 34
Contents

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
9
Contents
Installation (Continued) ................................................................................................ 35
Horizontal Or Vertical Venting (Category IV) - Positive Pressure.................................................................... 35
Direct Vent Requirements............................................................................................................................... 36
Direct Vent Indoor Installation (US and Canada) Horizontal Through-the-Wall (Termination).................. 37
Garage or Utility Room Installation (Vent Installation - Indoor Installation US and Canada).................... 39
Final Installation Check....................................................................................................................... 39
Condensate Management (Maintenance, Condensate Neutralizer Cartridge Drain/Tubing Installation)....... 40
Electrical Connections .................................................................................................................................... 42
Bonding ..................................................................................................................................................... 42
120 VAC / 240 VAC Wiring......................................................................................................................... 42
Remote Control Connections ......................................................................................................................... 43
Fireman’s Switch Connection ......................................................................................................................... 43
Connecting the Heater to the IntelliCenter Control System Load Center via RS-485 .................................... 45
Connecting the RS-485 Cable from the Heater to the Load Center............................................................... 46
Heater Connection Wiring Diagram................................................................................................................ 48
Heater Ladder Wiring Diagram....................................................................................................................... 49
Troubleshooting.......................................................................................................... 50
Initial Troubleshooting and Error / Fault Codes .............................................................................................. 50
Initial Troubleshooting Chart........................................................................................................................... 51
Heater Will Not Fire A.................................................................................................................................. 52
Heater Will Not Fire B.................................................................................................................................. 53
Diagnostics LEDs: PS, HLS, TF, IGN, AFS, AG1, FS ................................................................................ 54-55
Diagnostics Alarms: PS, AFS, AGS, HLS .................................................................................................. 56
Alarms: SFS ............................................................................................................................................... 57
ALarms: CFS, TF, E01 or 126 .................................................................................................................... 58
Burner Troubleshooting .................................................................................................................................. 59
Heat Exchanger Troubleshooting ................................................................................................................... 59
Operator Control Panel Displays RNC Code.................................................................................................. 59
Maintenance and Care Instruction ............................................................................ 60
Care and Maintenance...................................................................................................................... 60
TitanTough Heat Exchanger Assemblies Annual Inspection ............................................................ 60
Burner Spark Electrode and Flame Sensor Rod Annual Inspection ................................................. 61
Pressure Relief Valve (50 psi)........................................................................................................... 61
After Start-Up................................................................................................................................... 62
Spring and Autumn ....................................................................................................................... 62
Winter Operation and Winterization .............................................................................................. 62
Removal of Condensate Cartridge in Freezing Temperatures.......................................................... 63
Return the Heater to Service............................................................................................................. 63
Maintaining Pool Temperature.......................................................................................................... 63
Energy Saving Tips....................................................................................................................... 63
Chemical Balance ............................................................................................................................. 64-65
Heater Replacement Parts.......................................................................................... 66-73
Heater Replacement Parts List ......................................................................................................... 66
General Replacement Parts.............................................................................................................. 67
Heater Blower Assembly Replacement Parts ................................................................................... 68
Heat Exchanger Assembly Replacement Parts ................................................................................ 70/71
Heater Manifold Assembly - Inlet and Outlet Assembly Replacement Parts .................................... 72
Heater Condensate and Exhaust Assembly Replacement Parts...................................................... 73
Heater Operator Control Panel Assembly Replacement Parts ......................................................... 74
Contents

ETi 250 High Efficiency Pool and Spa Heater Installation and User’s Guide
10
OPERATOR CONTROL PANEL
Operation Instructions
Operation Instructions
Control Panel Description
LCD Display: The control panel LCD displays two
lines of text. During normal heater operation the current
pool or spa water temperature is shown on line 1 of
the display. The heater set point for the pool or spa is
shown on line 2 of the display. The display will turn off
after two (2) minutes of inactivity on the keypad. When
the display is off due to inactivity, pressing any button
will turn it back on.
POOL/SPA: Toggles between POOL and SPA mode:
Displays the selected pool or spa body of water
actual temperature and set point.
HEATER OFF: Press this button to put the heater into
IDLE/OFF mode. The LCD will display HEATER OFF.
UP Arrow Button: Increase heater temperature set point. Scroll through menu items and
change settings.
DOWN Arrow Button: Decrease heater temperature set point. Scroll through menu
items and change settings.
SELECT: Select current menu item or save menu item settings.
MENU/BACK: Enter menu items. Press Down to scroll through menu item. Press Menu/Back to return to main
screen.
HEATING (LED): Solid Red LED on indicates the heater currently heating. LED Off: Heater is not active. Note:
During the heater ignition process, this LED blinks. Note: See page 12 for Heating (LED) and Errors description.
Menu Navigation
1. Press MENU/BACK to display POOL MAX. Use the DOWN or UP button to scroll through each of the highlighted
menu items.
2. Press SELECT to access the highlighted item. Press UP/DOWN to change or view the highlighted item.
3. Press SELECT to save, exit the setting and return to the menu items. Note: To exit the menu without saving and
return to the main screen, press MENU/BACK two times.
Operating the Heater (Temperature Settings)
The heater temperature default settings are factory set at 70° F (21° C) for the pool mode and 95° F (35° C) for the
spa mode. Using the up and down arrows, you can set the thermostats to a minimum pool temperature of 65° F.
(18.3° C), or a maximum temperature of 104° F (40° C).
Heating the Pool or Spa (Press the HEATER OFF button to turn OFF the heater).
• Press POOL/SPA to select either Pool or Spa. The display shows the current set point and water temperature.
Press Up/Down to increase or decrease water set point temperature. If the current water temperature is below
the Set point water temperature, the heater will begin heating.
Temperature
Controls
Up/Down
LCD Temperature
Display
Menu/Back
Select
Buttons
Toggle
switch
displays
Heater/Off
Heater ON
Red LED
Indicator
Pool/Spa
Toggle Button
Figure 1. Heater Control Panel