A.O. Smith SUN-80, SUN-120 Installation Manual
INSTALLATION - OPERATION - MAINTENANCE
Low Lead Content
C US
LISTED
Solar Water Heater
Instruction Manual
DIRECT SOLAR WATER HEATERS
FOR POTABLE WATER HEATING ONLY
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE WRITE TO THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
PRINTED 1215 184441-005
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
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1
SAFE INSTALLATION, USE AND SERVICE
Your safety and the safety of others is extremely important in the installation, use, and servicing of this water heater.
Many safety-related messages and instructions have been provided in this manual and on your own water heater to
warn you and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this
manual. It is very important that the meaning of each safety message is understood by you and others who install, use,
or service this water heater.
This is the safety alert symbol. It is used to alert
you to potential personal injury hazards. Obey all
safety messages that follow this symbol to avoid
possible injury or death.
DANGER
WARNING
CAUTION
CAUTION
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety
message, and how to avoid the risk of injury.
DANGER indicates an imminently hazardous situation
which, if not avoided, will result in death or injury.
WARNING indicates a potentially hazardous situation
which, if not avoided, could result in death or injury.
CAUTION indicates a potentially hazardous situation
which, if not avoided, could result in minor or moderate
injury.
CAUTION used without the safety alert symbol
indicates a potentially hazardous situation which, if
not avoided, could result in property damage.
IMPORTANT DEFINITIONS
• QualiedInstaller:A qualied installer must have ability equivalent to a licensed tradesman in the elds of plumbing and electrical
installation of these appliances. This would include a thorough understanding of the requirements of the National Electrical Code and
applicable local electrical and plumbing codes (and tools necessary to conrm proper installation and operation of the water heater) as
they relate to the installation of electric water heaters. The qualied installer must have a thorough understanding of the water heater
Instruction Manual.
• Service Agency: A service agency also must have ability equivalent to a licensed tradesman in the elds of plumbing and electrical
installation of these appliances. This would include a thorough understanding of the requirements of the National Electrical Code and
applicable local electrical and plumbing codes (and tools necessary to conrm proper installation and operation of the water heater) as
they relate to the installation of electric water heaters. The service agency must have a thorough understanding of the water heater
Instruction Manual.
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GENERAL SAFETY
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3
INTRODUCTION
Thank You for purchasing this solar 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
• AHRI - Air-Conditioning, Heating, and Refrigeration Institute
• NEC - National Electrical Code
• NFPA - National Fire Protection Association
• UL - Underwriters Laboratories Inc.
• CSA - Canadian Standards Association
PREPARING FOR THE INSTALLATION
1. Read the “General Safety” section of this manual rst and then
the entire manual carefully. If you don’t follow the safety rules,
the solar water heater will not operate properly. It could cause
DEATH, SERIOUS BODILY INJURY, AND/OR PROPERTY
DAMAGE.
This manual contains instructions for the installation,
operation, and maintenance of the electric water heater. It also
contains warnings throughout the manual that you must read
and understand. 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 SOLAR WATER HEATER.
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 local code requirements
follow NFPA-70, the National Electrical Code (current
edition), which 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 local utility
or the manufacturer whose name appears on the rating plate.
4. Carefully plan your intended placement of the water
heater. INSTALLATION OR SERVICE OF THIS WATER
HEATER REQUIRES ABILITY EQUIVALENT TO
THAT OF A LICENSED TRADESMAN IN THE FIELD
INVOLVED. PLUMBING AND ELECTRICAL WORK
ARE REQUIRED.
Examine the location to ensure the water heater complies with
the “Facts to Consider About the Location” section in this manual.
5. For California installation this water heater must be braced,
anchored, or strapped to avoid falling or moving during
an earthquake. See instructions for correct installation
procedures. Instructions may be obtained from California
Ofce of the State Architect, 400 P Street, Sacramento, CA
95814.
6. 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.
TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE............................2
GENERAL SAFETY..................................................................3
INTRODUCTION ...................................................................... 4
Preparing for the Installation...............................................4
TABLE OF CONTENTS ............................................................ 4
TYPICAL INSTALLATION ......................................................... 5
LOCATING THE NEW SOLAR WATER HEATER ....................6
Facts to Consider About the Installation .............................6
Insulation Blankets .............................................................6
INSTALLING THE NEW SOLAR WATER HEATER ............6-11
Local Codes........................................................................6
Temperature-Pressure Relief Valve .................................6-8
Closed System/Thermal Expansion ...................................8
Locating the Solar Water Heater ........................................8
Water Piping ..................................................................8-10
Filling the Solar Water Heater with Water .........................10
T&P Valve and Pipe Insulation (Selected Models) ........... 10
Wiring of Element ........................................................ 10-11
Thermostat ....................................................................... 11
Tank Sensor...................................................................... 11
OPERATION ........................................................................... 12
Temperature Regulation ................................................... 12
Temperature Settings .......................................................12
Temperature Adjustment...................................................12
FOR YOUR INFORMATION ...................................................13
Thermal Expansion...........................................................13
Strange Sounds ................................................................ 13
Water Odor .......................................................................13
“Air” in Hot Water Faucets ................................................13
High Temperature Shut Off System ..................................13
MAINTENANCE ................................................................14-15
Draining & Flushing .......................................................... 14
Element ............................................................................14
Heating Element Replacement ......................................... 14
Thermostat Removal / Replacement ................................ 14
Anode Rod Inspection ...................................................... 15
Temperature-Pressure Relief Valve Operation .................15
Water Heater Sounds .......................................................15
REPAIR PARTS ......................................................................16
Repair Parts Schedule......................................................16
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TYPICAL INSTALLATION
Check all connections for leaks. Consult the local utility company to examine installation for propriety and safety.
INSTALL THERMAL EXPANSION
TANK IF WATER HEATER IS
INSTALLED IN A CLOSED
TEMPERED
WATER
OUTLET
FROM
COLLECTOR
(SOLAR LOOP)
TEMPERATURE
PRESSURE
RELIEF VALVE
DISCHARGE PIPE
(DO NOT PLUG)
FROM
COLLECTOR
(SOLAR LOOP)
(ALTERNATE)
WATER SYSTEM
MIXING
VALV E
VACUUM RELIEF
VALV E
INSTALL PER
LOCAL CODES
COLD
WATER
INLET
WATER INLET
SHUTOFF
VALV E
TO PUMP
(SOLAR LOOP)
SENSOR
WIRES
ELECTRICAL
JUNCTION BOX
HEATING ELEMENT
ACCESS COVER
TANK SENSOR STUD
ACCESS COVER
6” AIR GAP
TO SUITABLE
DRAIN
DRAIN
VALV E
AT LEAST 2” GREATER
THAN THE DIAMETER
OF THE WATER HEATER.
Figure 1.
Water (Potable) Heating: All models are considered suitable
for water (potable) heating only.
TANK SENSOR STUD
TO PUMP
(SOLAR LOOP)
(ALTERNATE)
SUITABLE DRAIN PAN
HOTTER WATER CAN SCALD:
Water heaters are intended to produce hot water. Water heated to a
temperature which will satisfy space heating, clothes washing, dish
washing, and other sanitizing needs can scald and permanently injure
you upon contact. Some people are more likely to be permanently
injured by hot water than others. These include the elderly, children,
the inrm, or physically/mentally disabled. If anyone using hot water
in your home ts into one of these groups or if there is a local code
or state law requiring a certain temperature water at the hot water
tap, then you must take special precautions. In addition to using
the lowest possible temperature setting that satises your hot water
needs, a means such as a mixing valve should be used at the hot
water taps used by these people or at the water heater. Mixing valves
are available from your local plumbing contractor. Consult a Qualied
Installer or Service Agency. Follow mixing valve manufacturer’s
instructions for installation of the valves. Before changing the factory
setting on the thermostat, read the “Temperature Regulation” section
in this manual.
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5
LOCATING THE NEW SOLAR WATER HEATER
FACTS TO CONSIDER ABOUT THE LOCATION
Carefully choose an indoor location for the new solar water
heater, because the placement is a very important consideration
for the safety of the occupants in the building and for the most
economical use of the water heater.
Whether replacing an old water heater or putting the water
heater in a new location, the following critical points must
be observed:
1. Select a location indoors as close as practical or centralized
to the water piping system as possible. The solar water
heater should be located in an area not subject to freezing
temperatures.
2. Selected location must provide adequate clearances (4”/101.6
mm) for servicing parts such as the thermostats, drain valve, and
relief valve. Adequate clearance for servicing this water heater
should be considered before installation, such as changing the
anodes, etc.
3. The solar water heater should be located so it is not subject to
physical damage by moving vehicles or area ooding.
Installation of the solar water heater must be accomplished in
such a manner that if the tank or any connections should leak,
the ow will not cause damage to the structure. For this reason,
it is not advisable to install the solar water heater in an attic or
upper oor. When such locations cannot be avoided, a suitable
metal drain pan should be installed under the solar water heater.
Drain pans are available from your local plumbing contractor.
Such a drain pan must have a minimum length and width of at
least 2 inches (51 mm) greater that the water heater dimensions
and must be piped to an adequate drain.
Water heater life depends upon water quality, water pressure and the
environment in which the water heater is installed. Water heaters are
sometimes installed in locations where leakage may result in property
damage, even with the use of a drain pan piped to a drain. However,
unanticipated damage can be reduced or prevented by a leak detector
or water shut-off device used in conjunction with a piped drain pan.
These devices are available from some plumbing supply wholesalers
and retailers, and detect and react to leakage in various ways:
• Sensors mounted in the drain pan that trigger an alarm or turn off
the incoming water to the water heater when leakage is detected.
• Sensors mounted in the drain pan that turn off the water supply to
the entire home when water is detected in the drain pan.
• Water supply shut-off devices that activate based on the
water pressure differential between the cold water and hot
water pipes connected to the water heater.
INSULATION BLANKETS
Insulation blankets are available to the general public for external
use on electric water heaters but are not necessary with this
product. The purpose of an insulation blanket is to reduce the
standby heat loss encountered with storage tank heaters. Your
water heater meets or exceeds the National Appliance Energy
Conservation Act standards with respect to insulation and standby
loss requirements, making an insulation blanket unnecessary.
Should you choose to apply an insulation blanket to this heater,
you should follow these instructions below. Failure to follow these
instructions can result in re, serious personal injury, or death.
• Do not cover the temperature and pressure relief (T & P) valve
with an insulation blanket.
• Do not cover the instruction manual. Keep it on the side of the
water heater or nearby for future reference.
• Do obtain new warning and instruction labels for placement on
the blanket directly over the existing labels.
INSTALLING THE NEW SOLAR WATER HEATER
LOCAL CODES
The installation of solar water heater must be in accordance with
these instructions and all applicable local codes and electric utility
requirements. In the absence of local codes, install in accordance
with the current edition of the National Electrical Code (NFPA-70).
TEMPERATURE-PRESSURE RELIEF VALVE
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