HTP SUPERSTOR ULTRA MAX MSSU SE Series User manual

Installation
Start-Up
Maintenance
Parts
Warranty
For Residential and Commercial Use
MSSU SE Models*
*SE Denotes Back-Up Electric Element
Example Model Number: MSSU-80NSE
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
272 Duchaine Blvd. New Bedford, MA 02745 www.htproducts.com
lp-784 Rev. 000 Rel. 000 Date 5.28.21
This manual must only be used by a qualied installer /
service technician. Read all instructions in this manual
before installing. Perform steps in the given order. Failure to
do so could result in substantial property damage, severe
personal injury, or death.
HTP reserves the right to make product changes or updates
without notice and will not be held liable for typographical
errors in literature.
The surfaces of these products contacted by potable
(consumable) water contain less than 0.25% lead by weight as
required by the Safe Drinking Water Act, Section 1417.
®
ULTRA
MAX
Indirect Fired Water Heaters
Solar Supplement

lp-784 Rev. 000 Rel. 000 Date 5.28.21
2
The following dened terms are used throughout this manual to
bring attention to the presence of hazards of various risk levels or to
important product information.
DANGER indicates an imminently hazardous situation which, if not
avoided, will result in serious personal injury or death.
WARNING indicates a potentially hazardous situation which, if not
avoided, could result in personal injury or death.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in moderate or minor personal injury.
CAUTION used without the safety alert symbol indicates a
potentially hazardous situation which, if not avoided, may result in
property damage.
NOTICE is used to address practices not related to personal injury.
Foreword
This manual is intended to be used in conjunction with other literature
provided with the Solar Water Heater. This includes all related control
information. It is important that this manual, all other documents
included with this system, and additional publications, such as Solar
Water Heating System Design and Installation Guidelines, SRCC OG-300,
be reviewed in their entirety before beginning any work.
Installation should be made in accordance with the regulations of
the Authority Having Jurisdiction, local code authorities, and utility
companies which pertain to this type of water heating equipment.
Authority Having Jurisdiction (AHJ) – The Authority Having Jurisdiction
may be a federal, state, local government, or individual such as a re
chief, re marshal, chief of a re prevention bureau, labor department
or health department, building ocial or electrical inspector, or others
having statutory authority. In some circumstances, the property owner
of his/her agent assumes the role, and at government installations, the
commanding ocer or departmental ocial may be the AHJ.
NOTE: HTP reserves the right to modify product technical specications
and components without prior notice.
For the Installer
Table of Contents
Introduction 2
Part 1 - General Safety Information 3
A. When Servicing the Solar Water Heater 3
B. Local Installation Regulations 3
C. Chemical Vapor Corrosion 3
D. Insulation Blankets 3
E. Water Temperature Adjustment 4
F. Freeze Protection 4
Part 2 - Important Information 4
A. Scope of this Manual 4
B. Local Standards and Authorized Persons 4
C. Terminology 4
D. Locating the Solar Water Heater 4
E. Specications and Dimensions 5
Part 3 - Piping 6
A. Potable Water Piping 6
B. Water Chemistry Requirements 6
C. Solar Heat Exchanger Piping 6
D. Potable Water Piping Application 7
E. Tank Sensor Placement 7
F. Applications 8
G. Circulator Sizing 9
H. Electrical Connection 9
I. Filling the Water Heater 9
J. Thermostat Adjustment 9
K. Combination Thermostat and High Limit Control ECO 9
L. Thermostat Adjustment and ECO Reset 10
M. Heating Element Replacement Procedure 10
Part 4 - Service / Maintenance Procedures 11
A. Shutdown Procedures 12
B. Vacation Shutdown 12
C. Estimated Life of Components 12
D. Temperature and Pressure Relief Valve 12
Part 5 - Troubleshooting 12
A. Leaks 12
B. Other Problems 12
C. Operating Suggestions for the User 12
Part 6 - Replacement Parts 14
Customer Installation Record Form 15
For your safety, please read through this manual carefully before
installation to minimize the risk of re, property damage, personal
injury, or death. Ensure the solar hot water system is properly
installed in accordance with this manual before use.
INSTALLATION OR SERVICE IS REQUIRED TO BE PERFORMED BY
LICENSED PROFESSIONALS WHERE SOLAR, PLUMBING, AND
ELECTRICAL WORK IS REQUIRED.
The installer should be guided by the instructions furnished with
the tank, as well as local codes and utility company requirements.
Preference should be given to codes and requirements where they
dier from the furnished instructions. Always use the latest edition of
codes.
Additional publications which should guide the installer include:
Local, state, provincial, and national codes, laws, regulations, and
ordinances.
Introduction
Your water heater has an internal heat exchanger for use with solar
collectors. When there is not sucient solar energy, the water
heater utilizes a backup system to provide hot water. In SE Series
models, the water heater has an electric heating element. (Refer to
Applications in this manual for piping examples of both models.)
Your system uses a circulation pump to circulate heat transfer uid
(HTF) throughout a closed loop system. Closed loop propylene
glycol systems provide additional freeze protection for the solar
components.
For Your Records
Write the Product Model and Serial Numbers:
Model # ___________________________________________
Serial # ____________________________________________
These numbers are listed on the product ratings label.
Keep this manual and information for future reference.
Solar Water Heating System Design and Installation Guidelines, SRCC
OG-300, available from Solar Rating & Certication Corporation,
400 High Point Drive, Suite 400, Cocoa, FL 32926-6630, www.solar-
rating.org.
The latest version of the National Electrical Code, NFPA No. 70.
In Canada refer to Canadian Electrical Code C 22.1, from Canadian
Standards Association, 5060 Spectrum Way, Suite 100, Mississauga,
Ontario, Canada L4W 5N6.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
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Part 1 - General Safety Information
Installer - Read all instructions in this manual before installing.
Perform steps in the given order.
User - This manual is for use only by a qualied heating installer
/ service technician. Have this water heater serviced / inspected
annually by a qualied service technician.
Failure to adhere to these guidelines can result in substantial
property damage, severe personal injury, or death.
NOTE: Obey all local codes. Obtain all applicable permits before
installing the water heater.
NOTE: Install all system components and piping in such a manner
that does not reduce the performance of any re rated assembly.
DO NOT USE THIS WATER HEATER IF ANY PART HAS BEEN
SUBMERGED IN WATER. Immediately call a qualied service
technician. The water heater MUST BE replaced if it has been
submerged. Attempting to operate a water heater that has been
submerged could create numerous harmful conditions, such as
a potential gas leakage causing a re and/or explosion, or the
release of mold, bacteria, or other harmful particulates into the
air. Operating a previously submerged water heater could result in
property damage, severe personal injury, or death.
NOTE: Water heater damage due to ood or submersion is
considered an Act of God, and IS NOT covered under product
warranty.
NOTE: If the solar water heater is exposed to the following, do not
operate. Immediately call a qualied service technician.
1. Fire
2. Damage
3. Submersion in Water
Failure to adhere to these guidelines can result in substantial
property damage, severe personal injury, or death.
Only use this water heater as intended and described in this
installation manual. Any use other than described will void
warranty and may lead to re, property damage, personal injury,
or death.
Improper installation or use may result in property damage. Such
damages ARE NOT covered by warranty.
UNCRATING THE WATER HEATER - Any claims for damage or
shortage in shipment must be led immediately against the
transportation company by the consignee.
ALL PIPING AND PLUMBING CONNECTIONS SHOULD BE MADE
WITH COPPER PIPE ONLY. No less than ¾” I.D. copper tube of the
type meeting local codes must be used for piping. Pipe runs must
be solidly attached with proper clamping methods. Soldered
A. When Servicing the Solar Water Heater
To avoid electric shock, disconnect electrical supply before performing
maintenance.
To avoid severe burns, allow solar collector and associated equipment
to cool before servicing.
B. Local Installation Regulations
Installation of this solar water heater may be governed by individual
local rules and regulations, which must be observed. Always use
the latest edition of codes. The installation, adjustment, service, and
maintenance of the solar water heater must be done by a licensed
professional who is qualied and experienced in the installation,
service, and maintenance of solar hot water heaters.
C. Chemical Vapor Corrosion
Products to Avoid Areas Likely to Have
Contaminants
Spray cans containing
uorocarbons
Dry cleaning / laundry areas
and establishments
Permanent wave solutions Swimming pools
Chlorinated waxes / cleaners Metal fabrication plants
Chlorine-based swimming pool
chemicals Beauty shops
Calcium chloride used for
thawing Refrigeration repair shops
Sodium chloride used for water
softening Photo processing plants
Refrigerant leaks Auto body shops
Paint or varnish removers Plastic manufacturing plants
Hydrochloric or Muriatic acid Furniture renishing areas and
establishments
Cements and glues New building construction
Antistatic fabric softeners used in
clothes dryers Remodeling areas
Chlorine-type bleaches, laundry
detergents, and cleaning solvents Garages and workshops
Adhesives used to fasten building
products
Table 1 - Products and Areas Likely to Have Contaminants
NOTE: DAMAGE TO THE WATER HEATER, COLLECTOR, OR
RELATED COMPONENTS CAUSED BY EXPOSURE TO CORROSIVE
VAPORS IS NOT COVERED BY WARRANTY. (Refer to the limited
warranty for complete terms and conditions.)
D. Insulation Blankets
For installation of insulation blankets, refer to Solar Water Heating
System Design and Installation Guidelines, SRCC OG-300.
NOTE: System performance and eciency varies with factors such
as: household hot water load, ambient air temperature, collector/
roof pitch, collector orientation, and seasonal intensity.
Job site conditions will require your installation contractor to supply
some or all of the following:
• Plumbing connections
• Piping and insulation
• Valves between your backup water system and the solar
system
NOTE: Failure to follow the procedures and instructions in this
manual WILL VOID the warranty.
connections should be secured with 95/5 lead-free solder. Use only
pipe rated for 250oF minimum on both the collector return and supply
piping.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
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E. Water Temperature Adjustment
An ASSE 1017 rated mixing valve to avoid severe burns or death from
scalding temperatures IS REQUIRED PER SRCC OG-300.
Approximate Time / Temperature Relationships in Scalds
120oF More than 5 minutes
125oF 1 1/2 to 2 minutes
130oF About 30 seconds
135oF About 10 seconds
140oF Less than 5 seconds
145oF Less than 3 seconds
150oF About 1 1/2 seconds
155oF About 1 second
Table 2 - Approximate Time / Temperature Relationships in Scalds
Households with small children, disabled, or elderly persons may
require a 120oF or lower temperature setting to prevent severe
personal injury or death due to scalding.
In addition, to prevent
scalding, the high
temperature of the
potable water must be
limited using an ASSE
1016 tempering valve.
This valve is usually
located between the hot
water storage tank and
faucets in bathrooms,
kitchens, etc. Tempering
valves are mandatory
under most codes and
usually set to a maximum
of 120oF. Tempering
valves must be rated for
high-temperature solar
use.
F. Freeze Protection
NOTE: Consider piping and installation when determining water
heater location. Place the water heater in a location not prone to
freezing.
Failure of the water heater, solar system, or components due to
freeze related damage IS NOT covered by product warranty.
Part 2 - Important Information
A. Scope of this Manual
This manual pertains only to the installation and operation of
the solar water heater. Details for the installation, operation, and
maintenance of the complete solar water heating system, including,
but not limited to: the solar collector(s), boiler, pump, system
controller, valves, and other plumbing components, should be
provided separately by their respective manufacturers.
NOTE: This manual is primarily a reference document for authorized
installation individuals, as the solar water heater is not permitted to
be installed by non-authorized persons.
In order to meet health and safety regulations, solar system antifreeze
uid should be food grade polypropylene glycol, FDA rated as
“generally recognized as safe” (GRAS). Using proper concentrations
of glycol, solar systems can be operated at ambient temperatures as
low as -60oF. Freeze tolerance limits are based upon an assumed set
of environmental conditions. Refer to the specication sheet included
with the glycol for recommended concentrations. A glycol / potable
B. Local Standards and Authorized Persons
Installation must be completed in accordance with local standards
and regulations.
Installation must also be completed by a qualied tradesperson
who holds relevant industry licenses or certicates. The term
“authorized person(s)” used throughout this document refers to a
suitably qualied professional. Unless otherwise specied, no part
of the solar water heater may be inspected, repaired, or maintained
by anybody other than an authorized person.
C. Terminology
Solar terminology diers from region to region. To avoid confusion,
please note the following:
Supply – The plumbing line running from the outlet of the collector
to the tank (or heat exchanger).
Return – The plumbing line running from the tank (or heat
exchanger) to the inlet of the collector. This line incorporates the
circulation pump.
water mix must not exceed 50%, unless the manufacture species
that a dierent ratio is recommended for use with solar water heaters.
Glycol may need to be changed periodically (every 3-5 years) to
prevent it from becoming acidic; please refer to the guidelines
provided by the glycol manufacturer regarding replacement.
NOTE: The use of glycol not recognized as GRAS is allowed in double
wall heat exchanger models ONLY.
COLD WEATHER HANDLING - If the water heater has been stored
in a very cold location (BELOW 0oF) before installation, handle with
care. Failure to do so could result in damage to the water heater.
D. Locating the Solar Water Heater
This water heater is certied for indoor use only. DO NOT INSTALL
OUTDOORS. Outdoor installations ARE NOT covered by warranty.
To minimize expense, choose a location for the water heater as
centralized to the domestic piping system and near the solar
collectors as possible. Also, locate the water heater and domestic
water piping where it will not be exposed to freezing temperatures.
All piping should be insulated to protect against freezing and
minimize heat loss. Additionally, place the water heater so that the
drain, controls, and inlets/outlets are easily accessible.
NOTE: If you do not provide the minimum clearances shown in
Figure 3, it might not be possible to service the water heater without
removing it from the space.
NOTE: A combustible door or removable panel is acceptable front
clearance.
The solar water heater should also be installed in a place where T&P
discharge or a leak will not result in damage to the surrounding area.
Install a 2”high drain pan with a minimum of ¾”drain line to prevent
water damage if leakage should occur. See Figure 3.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
5
Filled hot water storage tanks are very heavy, and should be
located in areas that can structurally support such weight. Failure
to properly locate water storage tanks could result in property
damage, personal injury, or death.
High heat sources (sources generating heat 100oF / 37oC or
greater, such as stove pipes, space heaters, etc.) may damage
plastic components of the water heater as well as plastic vent
pipe materials. Such damages ARE NOT covered by warranty. It is
recommended to keep a minimum clearance of 8” from high heat
sources. Observe heat source manufacturer instructions, as well
as local, state, provincial, and national codes, laws, regulations
and ordinances when installing this water heater and related
components near high heat sources.
DIA. OF WATER HEATER
PLUS 2" MINIMUM
MAXIMUM 2"
TO OPEN DRAIN.
LINE SHOULD BE AT
LEAST 3/4" ID AND
PITCHED FOR PROPER
DRAINAGE
6" MIN. 6" MIN.
24" MIN.
ZERO CLEARANCE
LP-784-A
05/27/21
RECOMMENDED SERVICE CLEARANCES
Figure 1 - Recommended Service Clearances
This water heater must be installed upright in the vertical position
as described in this manual. DO NOT attempt to install this water
heater in any other orientation. Doing so will result in improper
water heater operation and property damage, and could result in
serious personal injury or death.
E. Specications and Dimensions
A
B
C
D
E
F
LP-784-B
05/27/21
MODEL# GAL.
HEAT
EXCHANGER
CONNECTION
SIZE
DOMESTIC
INLET/OUTLET
APPROX.
SHIPPING
WEIGHT (lbs)
MSSU-80NSE 80
1" NPT 3/4" NPT
160
MSSU-115NSE 115 235
MODEL# GAL.
DIMENSIONS
A B C D E F
MSSU-80NSE 80 23-1/2" 7-1/4" 21-1/2" 60-1/4" 69" 2-1/2"
MSSU-115NSE 115 27" 7-1/4" 21-1/2" 60-1/4" 69" 2-1/2"
MODEL
SOLAR HX
VOLUME
GALLONS
WATER
VOLUME OF
BACK UP
MAX. OPERATING
PRESSURE OF COIL
RECOVERY OF
BACK-UP IN
MINUTES *
FIRST
DRAW**
65
RISE 90 RISE
MSSU-80NSE 1 22
150 PSI
63 85 68 GAL.
MSSU-115NSE 1 32 84 112 102 GAL.
Figure 2 - MSSU SE Series Water Heater Dimensions and Specications - *NOTE: Recovery was tested with no input to coil. **NOTE: First draw was
acquired by heating the entire tank until thermostat was satised, then drawing until a Delta T of 15oF was seen at the outlet.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
6
B. Water Chemistry Requirements
Chemical imbalance of the water supply may aect eciency and
cause severe damage to the appliance and associated equipment.
Water quality must be professionally analyzed to determine whether
it is necessary to treat the water. Various solutions are available to
adjust water quality. Adverse water quality will aect the reliability
of the system. In addition, operating temperatures above 135oF will
accelerate the build-up of lime scale and possibly shorten appliance
service life. Failure of an appliance due to lime scale build-up, low pH,
or other chemical imbalance IS NOT covered by the warranty.
The water must be potable, free of corrosive chemicals, sand, dirt,
and other contaminates. It is up to the installer to ensure the water
does not contain corrosive chemicals or elements that can damage
the heat exchanger. Potable water is dened as drinkable water
supplied from utility or well water in compliance with EPA secondary
maximum contaminant levels (40 CFR Part 143.3). If the water contains
contaminants higher than outlined by the EPA, water treatment is
recommended and additional, more frequent maintenance may be
required.
If you suspect that your water is contaminated in any way,
discontinue use of the appliance and contact an authorized
technician or licensed professional.
• Water pH between 6.5 and 8.5
• pH levels below 6.5 can cause an increase in the rate of
corrosion. pH of 8.5 or higher can potentially cause lime
scale build-up
• Maintain water pH between 6.5 and 8.5. Check with litmus
paper or have it chemically analyzed by a local water
treatment company.
• If the pH is not between 6.5 and 8.5, consult a local water
treatment company for solutions.
• Hardness less than 12 grains (200 mg/L) (Residential Use
- water temperatures below 140oF)
• Hardness less than 7 grains (120 mg/L) (Commercial Use
- water temperatures of 140oF and greater)
• Hardness levels above the required amounts can lead to
lime scale build-up throughout the system. Water below 5
grains/gallon (85 mg/L) may be over softened.
• Consult local water treatment companies for unusually
hard water areas (above the required amounts) or for
other treatment solutions if water is being over softened
(below 5 grains/gallon [85 mg/L]).
• Chloride concentration less than 100 ppm (mg/L)
• Do not ll appliance or operate with water containing
chlorides in excess of 100 ppm (mg/L).
• Using chlorinated fresh water should be acceptable as
levels are typically less than 5 ppm (mg/L).
• Do not connect the appliance to directly heat swimming
pool or spa water.
• Total Dissolved Solids (TDS) less than 500 ppm (mg/L)
• Total dissolved solids are minerals, salts, metals, and
charged particles that are dissolved in water.
• The greater the amounts of TDS present, the higher the
corrosion potential due to increased conductivity in the
water.
• If using softened water to ll the appliance, it is still
possible to have high TDS. This water can be corrosive.
Consult local water treatment companies for other
treatment solutions to reduce this aect.
*NOTE: To promote appliance service life, it is strongly
recommended to follow the maintenance procedures in this
manual.
C. Solar Heat Exchanger Piping
Set up the primary balance of the system components following the
piping detail in Figure 5.
Run ½” type M or larger copper pipes, or ex line sets, to and from
the collector following the direction of supports, penetrations, and
other relative items.
Only copper, cast iron, or brass are to be allowed in the collector
piping loop due to transient operating temperatures that may reach
as high as 300oF. PEX, PVC, CPVC, and other polymers are expressly
prohibited in the piping network of closed loop systems.
When making a connection to the heat exchanger, use Teon
Tape and joint compound to prevent leaks. The connections to the
heat exchanger are 1” NPT. Do not apply heat directly to the heat
exchanger thread connection when sweating ttings.
Line pressure and temperature gauge shall be installed in the
collector supply and return lines to allow for a simple diagnostic
check of proper system operation. On a sunny day, the hot water
Part 3 - Piping
The design and installation of the solar water heating system should
be done by qualied individuals. It is important that good design
and installation practices be followed to assure that your system will
operate properly. Failure to follow installation guidelines for your solar
water heating system could cause component failure and possible
safety issues.
A. Potable Water Piping
It is very important that you do the potable piping before you pipe
into your solar system. Failure to do so may damage your water
heater.
Do not introduce HTF into any ttings on the heater except those
clearly marked for that purpose.
It is mandatory that all plumbing be done in accordance with local
and state codes or warranty will be void. It is also necessary to use
both thread tape and pipe dope on all mechanical connections. The
potable water piping is located on the side of your solar water heater
and marked Hot and Cold. It is recommended that unions or exible
copper connectors be used so heater can be easily serviced. Install a
shut-o valve on the cold feed near the solar water heater to isolate
the tank for future service.
Provide clear access to the water heater, pump, expansion tank, mixing
valve, time clock and other key components. The components on the
potable side of the system may require future service or maintenance,
so it is recommended that the connections be made with brass unions.
You must use copper and brass ttings in plumbing the solar storage
tank and expansion tank. The use of galvanized ttings, nipples,
dielectric unions, CPVC, PVC, or other plastic pipe is prohibited.
Hard copper connections to the city cold water supply line and home
hot water feed lines are recommended.
The gaskets in standard water heater ex hose connectors can become
brittle and compressed over time and begin leaking on the water
heater. If not detected in a timely manner, a drip or leak may cause
serious damage to the tank’s electrical components, or, in extreme
cases, cause the tank to leak from the outside in.
Never use dielectric unions or galvanized steel ttings on any
domestic water connections or auxiliary connections. ONLY use
copper or brass ttings. Teon thread sealant must be used on all
connections.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
7
D. Potable Water Piping Application
Figure 3 - Potable Water Piping Application. Meant to demonstrate
piping concept only. Installer is responsible for all equipment and
detailing per local codes.
E. Tank Sensor Placement
Make sure the sensor is secured on the stud located in the
lower section of the water heater. Secure the sensor by packing
Armaex insulation behind it. This will also help the sensor react to
temperature change.
Non-toxic freeze protection uid must be used to protect the system
from freezing. Use a mixture appropriate for your climate. Do not
use a higher glycol to water concentration than necessary, as this
will adversely impact heat transfer eciency. See the manufacturer’s
data sheet for recommended concentrations. A copy of this sheet
must be left with the end user of the solar system.
The collector loop must be charged with HTF. Use potable water
as a mixing agent ONLY. Regular scheduled maintenance must be
established to monitor and maintain the proper pH level of HTF in
the system to protect the heat exchanger and other components in
the system.
return line should be approximately 5 – 12oF warmer than the water
in the collector supply line. Compare the temperature readings in
the two line thermometers. The ¾” cold water supply line to the
storage tank must be insulated with a minimum 7/8” x ½” pipe
insulation to a minimum distance of 5’behind the storage tank, or to
the wall if closer than 5’.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
8
F. Applications
Figure 4 - Solar Water Heater with Electric Back-Up
FIGURE NOTES:
1. This drawing is meant to show system piping concept only. The installer is responsible for all equipment and detailing by local codes.
2. Antifreeze, non-potable HTF shall be used for the solar heat exchanger circuit only. Never introduce antifreeze solution to any connection
other than the solar loop.
3. If there is a check valve on the cold water feed line, a thermal expansion tank suitable for potable water must be sized and installed within
this piping system between the check valve and cold water inlet of the solar water heater.
4. An ASSE 1017 mixing valve is required per SRCC OG-300.
5. A minimum of 12 diameters of straight pipe must be installed upstream of all circulators.
6. Make sure tank is fully purged of air before power is turned on to the backup heat source.
7. Circulators shown in the above hydronic piping should have an integral ow check or alternately use a stock pump with an external spring
type check valve. (Due to extreme temperatures, circulators with integral ow checks are not to be used in solar systems. If circulator
comes equipped with an integral ow check, remove it.)

lp-784 Rev. 000 Rel. 000 Date 5.28.21
9
Figure 5 - Sensor Installation Detail
60
80, 100, 115
Figure 6 - Pressure Drop through the Solar Heat Exchanger
Be sure to ground the water heater. The preferred way to ground
is with rigid metal conduit between the main panel and the water
heater junction box with approved end ttings (check codes on
the use of exible conduit). If making a separate ground, a green
ground wire is provided in the water heater junction box. Replace
the junction box cover and insulation after you have made the
wiring connections.
Do not use SE model water heaters with any voltage other
than shown on the model rating plate. Failure to follow these
instructions could result in property damage, serious personal
injury, or death.
This unit is factory wired to a junction box on top of the water heater.
A 4 x 4 x 2 junction box is located on top of the unit for eld wiring
connection. These heaters are equipped and wired as standard 120
volt AC (for point of use heaters) and 240 volt AC (for dual element
heaters). The voltage requirement and dedicated wattage load for
the heater is specied on the rating label. A minimum 30 amp circuit
is required to connect the water heater. Consult your local power
company to determine if your electrical service is adequate for the
additional load of the heater.
Refer to the wiring diagrams below for eld connections. 240V
electrical installation should be done by a qualied licensed
electrician or by your local electric utility. All wiring must conform
to local code and the National Electric Code. Grounding can be
accomplished by using approved conduit and ttings or other
approved conductive material. A grounding wire is provided on
the junction bracket. This grounding wire must be used in the
installation.
G. Circulator Sizing
The circulator pump must be sized for the related piping and
pressure drop of the heat exchanger, and for situations specic to
your solar system. The following graph represents the pressure drop
of the solar heat exchanger. Consult the solar panel manufacturer
for ow requirements to assist in pump selection.
H. Electrical Connection
Tank must be full before unit is turned on. The heating element will
be damaged if energized for even a short period of time while tank
is dry. This damage IS NOT covered by warranty.
Installation, attachment, or use of any unapproved devices in
conjunction with this water heater WILL VOID the warranty. The
use of unauthorized energy saving devices may shorten the life
of the water heater and possibly endanger property and life. The
manufacturer disclaims any responsibility for any loss or injury
resulting from the use of such unauthorized devices.
J. Thermostat Adjustment
The thermostat is located in the front of the heater. The access cover
must be removed to adjust the factory default setting of 119oF. This
temperature is satisfactory for average household use.
If an adjustment is necessary, turn o the power to the heater, remove
the black access cover and insulation. The thermostat protective cover
should not be removed. Set the temperature indicator to the desired
temperature, replace insulation and access cover. Turn on power to the
heater.
K. Combination Thermostat and High Limit Control ECO
This heater is equipped with a combination thermostat and high limit
safety. If for any reason the water temperature becomes excessively
high, the “High Limit Control (ECO)” breaks the circuit to the heating
element. Once the switch opens it must be reset manually. However,
THE CAUSE OF THE OVERHEATING CONDITION MUST BE CORRECTED
FIRST. Refer to the Troubleshooting section for possible causes. To reset,
press the red reset button as shown in Figure 11. Replace the insulation
and black access cover before restoring power to the system.
The cause of the high temperature condition must be investigated
by a qualied service technician and corrective action must be taken
BEFORE placing the water heater back in service. Failure to do so could
result in property damage, severe personal injury, or death.
After the water and electrical connections have been made and the
tank has been lled with water and purged of air, turn on power to the
heater. The heater is now operational.
I. Filling the Water Heater
When lling the water heater, open a hot water tap to release air in
the tank and piping. The tank must be full of water before the heater
is turned on. Failure to ensure the water heater is full before turning
it on will result in damage to the water heater, and could result in
property damage, serious personal injury, or death. Such damages
ARE NOT covered by water heater warranty.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
10
SL5007A
Figure 7 - Electrical Connection Detail
Figure 8 - Thermostat Detail
L. Thermostat Adjustment and ECO Reset
There are two thermostats on dual element heaters and one for point
of use units. If temperature adjustment is necessary, TURN OFF POWER
TO HEATER, remove black access cover and insulation. The thermostat
protective cover SHOULD NOT be removed. Set temperature indicator
to desired temperature. Replace insulation and the black access cover.
Turn on power to the heater.
Failure to disconnect the power from the water heater before
attempting to adjust or reset the thermostat(s) will result in property
damage, severe personal injury, or death.
IF YOU NEED TO ADJUST
THERMOSTAT(S) OR RESET THE
ECO (RED RESET BUTTON)
Step #1 - Turn o power to the
water heater by removing fuse or
shutting o at circuit breaker.
Step #2 - Remove the two screws
that hold the access cover in
place. Remove the cover.
Step #3 - Remove the insulation
to expose the thermostat.
Step #4 - See Figure 11
a. Reset the ECO by pushing
in the red button marked
“RESET”.
b. Adjust the water
temperature by turning the
white adjustment knob.
Turning the knob to the right
(clockwise) makes the water
hotter. Turning the knob to
the left (counterclockwise)
makes the water cooler.
Step #5 - Replace the insulation.
Figure 9 - Detail of Step #4
Risk of scald injury increases as you increase water temperature.
Failure to replace insulation or access cover could result in
property damage, severe personal injury, or death.
M. Heating Element Replacement Procedure
If heating elements need replacement, it is very important to use
the same voltage, wattage, and construction. The element sheath
must be incoloy and the hex plug must be made of stainless steel.
Step #1 - Turn o power to the water heater. Use a Phillips Head
screwdriver to remove the wires from the element.
Step #6 - Reattach the access cover with the two screws.
Step #7 - Restore power by
replacing the fuse or turning
on the circuit breaker.
Step #8 -
a. After resetting the
ECO, ensure the water
heater is operating
properly before leaving
the installation.
b. After adjusting the
water temperature, allow
the water heater enough
time to heat the water to
temperature. After the
water heater has stopped
heating, measure the
water temperature at a
hot water outlet in the
structure.
Step #9 - If the water heater
is operating properly and
the water temperature is
satisfactory, adjustment is
complete.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
11
Failure to disconnect the power from the water heater before
attempting heating element replacement will result in property
damage, severe personal injury, or death due to electric shock.
Step #2 - Run hot water at a faucet in the system. When it runs cold,
shut o the faucet. Then shut o water at the main cold water inlet
or, if possible, valve o the water heater from the system. Drain the
water from the system, or just the water heater if it can be isolated
from the system.
Completely drain the water heater before removing and replacing
a heating element or elements. Failure to do so will result in a
leakage of water and property damage, and could possibly result
in moderate to severe personal injury or death.
Water drained from the water heater may be scalding hot. Take
care to avoid scalding. Wear gloves and safety glasses, and direct
water to a safe drainage location. Failure to comply with this
warning could result in property damage, severe personal injury,
or death.
DO NOT replace heating element with a generic heating element.
Only HTP heating elements are approved for use with this water
heater. Failure to follow this warning will result in premature
product failure and VOID the warranty.
Step #3 - Remove the element with a 1 1/2” socket wrench or
element tool.
Step #4 - Inspect the removed element. Determine whether the
replacement element will need a square or circular gasket and
washer.
Figure 10 - Heating Element Detail
Step #5 - Ensure thread and opening are completely free of debris.
Use a nylon brush to clear away any debris.
Step #6 - Put a small amount of NSF approved lubricant and sealant
on the appropriate gasket and/or washer for the installation. Put the
gasket and/or washer on the element.
Step #7 - Screw the element clockwise into the tank, and tighten
with the 1 1/2” socket wrench or element tool. Be sure gasket seats
properly.
Step #8 - Open the main cold water inlet. If the water heater has
been isolated from the system, open the valves. Rell the tank with
cold water. Open a hot water faucet high in the system to bleed
any air pressure from the system. Water will ow freely when air is
completely bled.
When lling the water heater, open a hot water tap to release air in
the tank and piping. The tank must be full of water before the heater
is turned on. Failure to ensure the water heater is full before turning
it on will result in damage to the water heater, and could result in
property damage, serious personal injury, or death. Such damages
ARE NOT covered by water heater warranty.
Step #9 - Pressure check the tank for leaks around element. If no leaks
are found, use a Phillips Head screwdriver to connect the wires to the
element.
Step #10 - Turn power back on to the water heater.
Failure to rell the tank before restoring power to the water heater
will result in damage to the heating elements and property damage.
Such damages ARE NOT covered by warranty.
Part 4 - Service / Maintenance Procedures
A properly maintained solar water heating system can provide years
of dependable, trouble-free service. It is suggested that a routine
preventive maintenance program be established and followed by the
end user with the solar contractor. Listed below is the maintenance
check list that outlines the primary components of the solar system
that need to be inspected annually.
1. HTF Glycol – It is very important that the quality of the glycol
is maintained to avoid damage to the collector loop and related
components. See the manufacturer’s data sheet for further details.
2. Water quality can aect the operation of the solar heat exchanger
over time. In very hard water areas, it is recommended to drain a few
gallons of water from the bottom of the tank to keep the water heater
free of sediment.
3. Clean and inspect the solar collector. Dirt or lm may settle on the
surface and aect performance. Check collector supplier for cleaning
procedures.
4. Check piping and component insulation for deterioration.
5. Check solar tank sensors. Assure these sensors are secure and have
not moved or loosened.
6. Inspect the T&P valve on the water heater. Lift the release handle
lever. Make sure discharge is directed to an open drain.
Never open the pressure relief valve while the system is in operation
or hot water is present. Allow to cool prior to opening. Failure to do
so could result in serious personal injury or death.
7.The area near the water heater must be kept free of ammable liquids
such as gasoline, paint thinners, adhesives, or other combustible
materials.
8. The electric element may need cleaning. A hissing sound while
operating indicates the element has built up deposits. Cleaning should
only be done by a qualied plumbing or heating contractor.
If the heating element needs replacement, it isVERY important to use
the same voltage, wattage, and construction. This element must be
stainless steel and the hex plug be made of brass. This replacement
part is available from HTP and should not be purchased from outside
sources.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
12
Following installation of the T&P Relief Valve, the valve lever
MUST be operated AT LEAST ONCE A YEAR by the water heater
owner to ensure that waterways are clear. Certain naturally
occurring mineral deposits may adhere to the valve, blocking
waterways and rendering the valve inoperative. When the lever
is operated, hot water will discharge if the waterways are clear.
PRECAUTIONS MUST BE TAKEN TO AVOID PERSONAL INJURY FROM
CONTACT WITH HOT WATER AND TO AVOID PROPERTY DAMAGE.
BEFORE operating lever, check to see that a discharge line is
connected to the valve, directing the ow of hot water from the
valve to a proper place of disposal. If no water ows when the lever
is operated, replacement of the valve is required. TURN THE WATER
HEATER “OFF” AND CALL A PLUMBER IMMEDIATELY.
A. Shutdown Procedures
To isolate the water heater, simply shut down supply water shut o
valve which isolates the water heater from the pressurized cold water
supply.
The collector loop can be isolated from the solar storage tank by
closing shut o valves. If the pressure in this loop drops, or you nd a
glycol leak, shut these valves and contact your installation contractor.
Turn the circulating pump o on your solar control.
C. Estimated Life of Components
Proper care and maintenance will determine the life expectancy of the
individual components of the solar system. Refer to manufacturer’s
warranty information to determine coverage of individual
components. To obtain warranty service, call your local service or
installing contractor.
B. Vacation Shutdown
Solar water heaters can build up very high temperatures when there
is no daily draw on the system. The best way to dissipate heat in the
system is set the control to run the circulator pump 24 hours a day to
cool o the storage tank at night. The collector will radiate heat back
to the atmosphere at night, preventing the system from stagnating at
very high temperatures.
D. Temperature and Pressure Relief Valve
A temperature and pressure relief (T&P) valve is designed for
emergency safety relief and shall not be used as an operating control. A
T&P valve functions by discharging water in an emergency. Therefore,
it is essential that a discharge line be piped from the valve in order to
carry the overow to a safe place of disposal. The discharge line must
be the same size as the valve outlet, must pitch downward from the
valve, and terminate at least 6” above a drain where any discharge will
be clearly visible.
Part 5 - Troubleshooting
Owners are advised to contact the installer whenever in-depth
interaction with the solar system is required.
A. Leaks
For leaks in the potable water system or solar storage tank, close the
cold water inlet and unplug the solar controller. This will isolate the
solar system until repairs can be made.
B. Other Problems
A noisy pump could be an indication of worn bearings, obstructions,
or a leak in your system. Call your installer for diagnosis of the problem,
repair of the system, and/or replacement of components.
For your safety, DO NOT attempt repair of electrical wiring,
thermostat, heating element or other operating controls. Refer
repairs to qualied service personnel. Failure to do so could result
in serious personal injury or death.
C. Operating Suggestions for the User
A properly designed solar hot water system provides solar energy
for approximately 70 – 90% of annual hot water needs. Listed below
are some suggestions that will maximize the benets of your solar
hot water system.
1. Showers - If possible, take showers during the day, or in the
early evening. Use low ow showerheads to reduce water
consumption.
2. Dishwashing – Run your dishwasher during the day, after
showers, to ensure as much hot water as possible is available
for showers.
3. Laundry – Spread clothes washing over the week instead of
washing all at the same time.
4. Single Lever Faucets – When using cold water, make sure the
lever is all the way over in the cold position. This prevents
hot water from inadvertently owing from the solar storage
tank.
The risk of scald injury increases as you increase water
temperature. Use a water tempering or mixing valve and extreme
caution when using hot water to avoid scald injury. Consult codes
for conformance. Failure to follow the instructions in this warning
statement could result in serious personal injury or death from
scalds.
Be sure to disconnect electrical power before performing service.
Failure to do so could result in electrical shock, property damage,
serious personal injury, or death.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
13
Problem Reason Remedy
No Hot Water
1. Improper Wiring Rewire per Wiring Diagram
2. No Power - Blown Fuse or Tripped Circuit Breaker
a. Shorted Wiring
b. Circuit Overloaded
c. Improper Wiring
d. Grounded Element or Thermostat
a. **Replace or repair
b. **Provide adequate circuit or reduce load
c. ** Rewire per diagram
d. **Replace
3. Manual Reset Limit (ECO) Open
a. Thermostat Defective
b. Thermostat Out of Calibration
c. Heat Build-Up Due to Loose Wires
d. Defective Limit (ECO)
a. **Replace
b. **Lower setting or replace
c. **Tighten wire connections
d. **Replace
4. Solar System Incorrectly Installed **Check installation
5. Defective Element **Replace element
6. Leaking Plumbing or Open Hot Water Faucet(s) **Ensure all faucet(s) are closed. Check water meter
Not Enough Hot
Water
1. Heater Undersized Reduce rate of hot water use
2. Defective Element **Check amperage, replace element
3. Defective Thermostat or Wired Incorrectly **Check wiring or replace
4. Solar System Incorrectly Installed **Check installation
5. See #6 above in “No Hot Water” See #6 above in “No Hot Water”
Water Too Hot or Not
Hot Enough
1. Thermostat Setting Too High or Low Change setting as required
2. Thermostat Out of Calibration **Replace
3. Solar System Incorrectly Installed **Check installation
4. Grounded Element **Replace
Noisy Heating
Element Scale Built Up on Element **Remove and clean
Table 3 - Troubleshooting - See Water Heater Installation Manual for More Detailed Maintenance Information - ** USER - For your safety, DO NOT
attempt repair of electrical wiring, thermostat, or operating controls. Refer repairs to qualied service personnel.
CAUTION
If draining of the water heater is necessary, open the T&P valve or a hot water tap to prevent vacuum buildup in the tank and piping.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
14
Part 6 - Replacement Parts
1
2
4
5
6 3
7
8
910
12
11
13
14
15
16
17
LP-784-G
05/27/21
ITEM# DESCRIPTION
REPLACEMENT
PART#
1 PRESSURE RELIEF VALVE TP1000
2 THERMOSTAT 6060P-1008
3 THERMOSTAT MOUNTING BRACKET 6060P-955
4 PLASTIC PROTECTIVE COVER 6060P-994
5 ELECTRICAL ENCLOSURE COVER 6060P-187
6 #8 X 3/4 SELF TAPPING SCREWS 6075P-006
7 ELECTRIC ELEMENT W/GASKET 6060P-938
8 SOLAR SENSOR COVER 6060P-186
9 HEAT TRAP (60 GAL.) 6060P-1018
HEAT TRAP (100 GAL) 6060P-1019
HEAT TRAP (80/115 GAL.) 6060P-1037
10 DIP TUBE 6060P-015
11 SCREW - COVER 6060P-984
12 COVER 6060P-983
13 BRACKET - SOLAR SENSOR 8600P-054
14 NUT - SOLAR SENSOR BRACKET 6060P-632
15 COVER W/KNOCKOUTS 6060P-982
16 PROTECTIVE INSULATION 6060P-965
17 DRAIN VALVE 6070P-009
Figure 11 - Replacement Parts, SE Models
NOTE: If the heating element needs replacement, it is VERY important to use the same voltage, wattage, and construction. Use only HTP
elements. Failure to do so may lead to early element and/or water heater failure, and WILL VOID the warranty.

lp-784 Rev. 000 Rel. 000 Date 5.28.21
15
IMPORTANT
Customer: Please only sign after the installer has fully reviewed the installation, safety, proper operation, and maintenance of the system. If
the system has any problems please call the installer. If you are unable to make contact, please call your sales representative.
Distributor / Dealer: Please insert contact details.
Customer Installation Record Form
The following form should be completed by the installer for you to keep as a record of the installation in case of a warranty claim. After
reading the important notes at the bottom of the page, please also sign this document.
Customer’s Name
Date of Installation
Installation Address
Product Name / Serial Number(s)
Comments
Installer’s Code / Name
Installers Phone Number
Signed by Installer
Signed by Customer
Installation Notes