HTP SS-26-FP Installation manual

Flat Plate
Solar Collectors
Installation
Start-Up
Maintenance
Parts
Warranty
For Residential and Commercial Use
SS-26-FP / SS-32-FP / SS-40-FP Models*
*“FP” Denotes Smooth Copper Tube w/ Aluminum Plate Models
“U” Denotes Model with Unions
“W” Denotes Model with Sensor Wells
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.
NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.
272 Duchaine Blvd. New Bedford, MA 02745 www.htproducts.com
lp-364 Rev. 000 Rel. 007 Date 2.12.18

lp-364 Rev. 000 Rel. 007 Date 2.12.18
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 Flat Plate Solar Collector. 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
INSTALLATION OR SERVICE OF THESE SOLAR PANELS IS REQUIREDTO 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.
Additional publications which should guide the installer include:
Solar Water Heating System Design and Installation Guidelines, SRCC OG-
300, available from Solar Rating & Certication Corporation, 400 High
Table of Contents
Introduction - About Your Solar Collector 3
Part 1 - General Safety Information 3
A. When Servicing the Solar Water Heating System 3
B. Metallic Components 3
C. Local Installation Regulations 3
D. Flat Plate Collectors 3
E. High Temperatures 4
F. Safety Precautions 4
G. Water Temperature Adjustment 4
H. System Water 4
I. 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. Possible System Designs 4
1. Open Loop Systems 4
2. Closed Loop Systems 5
3. Drain Back Systems 5
E. Fluid Quality 5
F. Corrosion 5
G. Freeze Protection 5
H. Wind Stress 5
I. Snow Load 6
J. Storage Tanks 6
K. Hail Resistance 6
Part 3 - Installation Information 6
A. Transport, Unpacking, and Inspection 6
B. Collector Dimensions and Weights 7
C. Tools and Materials 7
D. System Design 7
E. Delta-T Controller Settings 8
F. Stagnation and Overheating 8
G. Sizing System to Avoid Overheating 8
H. Collector Angle, Plane, and Direction 8
1. Collector Direction 8
2. Collector Angle (Tilt) 8
3. Collector Plane (Horizontal or Vertical) 8
I. Avoid Shade 8
J. Location 8
K. Expansion Tank 8
1. Open Loop Systems 9
2. Closed Loop Systems 9
3. Drain Back Systems 9
L. Lightning Protection 9
M. Pipe Sizing and Connections 9
N. Connection of Multiple Collectors 9
O. Potable Water 9
P. Mounting Frame 9
Q. Galvanic Reaction 9
Part 4 - Mounting Installation 9
A. Mount Types 9
1. Tilt Mount (Part # 8600P-002) or 2/3 Mount (8600P-691) 9
2. Flush Mount (Part # 8600P-012) 9
3. Rack Mount (Part # 8600P-014) 9
B. General Mounting Information 9
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.
Point Drive, Suite 400, Cocoa, FL 32926-6630, www.solar-rating.org.
Code for the Installation of Heat Producing Appliances (latest version),
available from the American Insurance Association, 85 John Street,
New York, NY 11038.
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-364 Rev. 000 Rel. 007 Date 2.12.18
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Part 1 - General Safety Information
This solar collector is not intended for open loop (direct heating) of
swimming pool applications.
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 solar water heating system serviced /
inspected annually by a qualied service technician.
NOTE: If the solar water heating system 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 solar hot water system 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.
A. When Servicing the Solar Water Heating System
To avoid electric shock, disconnect electrical supply before performing
maintenance.
To avoid severe burns, allow solar collector and associated equipment
to cool before servicing.
NOTE: Obey all local codes. Obtain all applicable permits before
installing the solar system.
NOTE: Install all solar system components and piping in such a
manner that does not reduce the performance of any re rated
assembly.
UNCRATING THE SOLAR COLLECTOR - Any claims for damage
or shortage in shipment must be led immediately against the
transportation company by the consignee.
Introduction - About Your Solar Collector
Your Solar Collector is designed to oer reliable hot water heating
in hot, mild, or cold climates. Flat plate solar collectors operate in
open loop, closed loop, and drain back solar systems, making these
collectors ideal for a variety of installation designs.
NOTE: Solar 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.
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 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.
Part 5 - Roof / Wall Mounting Suggestions 12
A. Roof Mounting 12
B. Wall Mounting 12
Part 6 - Plumbing Connections 13
A. Temperature Sensor Insertion 13
B. Header Connection 13
C. Air Purge 13
1. Open Loop 13
2. Pressure Open Loop 13
3. Closed Loop 13
D. Plumbing Check 13
E. Glycol Freeze Protection 13
F. Insulation 13
G. Pump Selection 14
Part 7 - System Piping Applications 15
A. Reverse Return 15
B. Balance Flow Valves with Meters 15
C. Pressure System Plumbing Panel Attachment 15
Part 8 - Maintenance 16
A. Cleaning 16
B. Insulation 16
C. Draining the Collector 16
D. Stagnation 16
E. Other Components 16
Part 9 - Troubleshooting 16
A. No Hot Water 16
B. Reduced Solar Contribution 16
C. Regular Water Dumping 17
Part 10 - Installation Checklist 17
Ten (10) Year Limited Warranty 18
Customer Installation Record Form 20
Before Installation - Store panels in a safe, dry location. Do not store
panels outside on the ground where water or snow can collect and
cause damage. If panels are going to be stored for extended periods
of time before installation, store them indoors or outdoors high
enough o the ground to avoid water damage. It is recommended
to have the glass facing up and wrapped with a water resistant cover.
NOTE: Damages to panels due to improper storage ARE NOT covered
by warranty.
C. Local Installation Regulations
Installation of this solar water heating system may be governed
by individual local rules and regulations for this type of system,
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 systems.
B. Metallic Components
To avoid injury, always wear leather protective gloves when handling
solar collector components. All eorts have been made to make the
metal components safe to handle, but there may still be some sharp
edges.
D. Flat Plate Collectors
Be careful when handling the collectors, as they will break if dropped.
When installed, collectors may break if struck by a hard object (e.g. a
branch falling on the roof).

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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.
G. Water Temperature Adjustment
An ASSE 1017 rated mixing valve to avoid severe burns or death from
scalding temperatures IS REQUIRED PER SRCC OG-300.
E. High Temperatures
• Insunlight,thecopperplumbingports can reachtemperatures
in excess of 300oF. Thick leather gloves must be worn when
handling hot components to prevent serious burns.
• Keep solar hot water system and components away from
children and animals.
• In an installed, fully plumbed system, if the pump is stopped
in sunny conditions, the copper ports and piping can easily
reach temperatures in excess of 300oF. Caution should be
taken when handling such components.
• Do not store combustible materials (dry leaves, tree branches,
gasoline, etc.) in the vicinity of the solar system.
Failure to follow these warnings could lead to property damage,
serious personal injury, or death.
F. Safety Precautions
• Wear leather gloves when handling metal components and
hot plumbing components.
• Adhere to safety regulations when working on roofs (or at a
height).
• Always obtain engineer approval for installations in high wind
regions.
• Assembly of the solar hot water system requires two persons
with the ability to lift 75 pounds each.
• It is best to install the solar hot water system on a cool, cloudy
day.
• Use of lead solder is expressly prohibited. Use of galvanized
steel, CPVC, PVC, PEX, or any other type of plastic pipe is
prohibited.
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.
H. System Water
Do not use petroleum-based cleaning or sealing compounds in a
solar water heating system. Gaskets and seals in the system may be
damaged. This can result in substantial property damage.
Do not use “homemade cures” or “patent medicines”. Damage to the
system, substantial property damage, and/or serious personal injury
may result.
I. Freeze Protection
NOTE: Consider piping and installation when determining solar
collector location. Place the solar collector as close to the water heater
as possible.
Failure of the solar system or components due to freeze related
damage IS NOT covered by product warranty.
Part 2 - Important Information
A. Scope of this Manual
Thismanual pertainsonlytotheinstallationandoperation of thesolar
collector. Details for the installation, operation, and maintenance of
the complete solar gas/electric water heating system, including, but
not limited to: the storage tank, gas/electric booster, 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 collector is not permitted to be
installed by non-authorized persons.
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 collector 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.
Return – The plumbing line running from the tank (or heat
exchanger) to the inlet of the collector. This line incorporates the
circulation pump.
D. Possible System Designs
1. Open Loop Systems
An open loop system has potable water circulating through
the solar collectors. Open loop systems are recommended for
hot or warm climates that rarely freeze. For rare incidents when

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2. Closed Loop Systems
A closed loop system uses non-potable heat transfer uid (HTF)
and must be pressurized to less than 72.5 psi. Closed loop systems
require an expansion tank to accommodate HTF expansion. The
system should be designed to minimize stagnation after tank
temperature has been met; extensive stagnation may increase pH
levels and glycol deterioration.
The expansion tank and plumbing must be properly sized so that
the safety pressure relief valve will not activate except in the event
of component failure or extreme conditions. The pressure release
must be set at no more than 90 psi. (There may be exceptions in
engineered designs for tall buildings.)
3. Drain Back Systems
The drain back method provides eective overheating and freeze
protection, making these systems well-suited for all climates.
When storage tank water temperature settings are reached or the
collector temperature falls below a set temperature, the pump shuts
o, allowing the HTF to drain back into the tank. Some drain back
systems use potable water as HTF. Others use a propylene glycol /
potable water mix.
Drain back systems require larger pumps to move HTF up and into
the solar collectors. Mounting the drain back tank as high as possible
within conditioned space will reduce pump size.
For drain back systems, the solar loop often operates at less than
25 psi, far lower than open or closed loop systems. These low
operating pressures do not require an expansion tank. A pressure
relief valve, installed on the drain back tank and piped in copper to
an appropriate drainage location, will provide sucient expansion
protection. This pressure relief valve and drain outlet pipe must
never be sealed or blocked. The pressure relief valve is intended to
be operated for safety purposes only.
NOTE: Supply and return connections to the collector must use
eccentric ttings or a tting arrangement that allows full draining
of header pipes. The collector or array should be installed with a ¼”
pitch towards the supply port to facilitate the drain back process.
In addition, collector plumbing should slope toward the drain back
reservoir at ¼”per foot minimum to facilitate the drain back process.
If continual slope is not achievable, consider a pressurized closed
loop system.
E. Fluid Quality
Water quality is very important. Water in direct ow through the
solar collectors must rst meet potable water requirements; any
uid circulated through the collectors should be non-corrosive
to copper. In addition, water quality must meet the following
requirements.
Total Dissolved Solids < 500 ppm
Total Hardness < 7 grains (120 ppm)
Chlorides < 100 ppm
pH Levels 6.5 - 8.5
Table 1 - Water Quality Requirements
In areas with “hard” water (water hardness greater than 120 ppm)
where open loop format is used, lime scale may form inside the solar
collector. Scale deposits will reduce collector eciency and eventually
plug the collectors. In such regions, it is advisable to install a water
softening device to ensure the long term ecient operation of the
collector, or consider a closed loop system.
In order to meet health and safety regulations, glycol used should be
food grade propylene glycol, FDA rated as “generally recognized as
safe” (GRAS). If using a glycol / potable water mix, the water must meet
the above requirements. The glycol content of the liquid must not
exceed 50%, unless the manufacturer species that a dierent ratio
is recommended for use with solar water heaters. Glycol should be
checked periodically to prevent it from becoming acidic. Please refer
to guidelines provided by the glycol manufacturer regarding glycol
maintenance.
ambient temperature drops below freezing, the controller can
be programmed to provide freeze protection by circulating warm
water from the tank through the solar collectors.
For open loop systems, the normal operating pressure should be
less than 72.5 psi. This operating pressure is provided via use of
a pressure limiting/reduction valve on the main supply line. An
expansion tank is required in open loop systems.
An open loop system may allow the solar collectors to stagnate to
prevent overheating of the storage tank. In the event of component
failure, the pressure relief valve must be able to release the
increased pressure, and should be rated to meet the maximum
possible pressure output of the solar collector(s). Please see Part 3
for sections regarding overheating.
F. Corrosion
Both copper and stainless steel are susceptible to corrosion when,
amongst other factors, high concentrations of chlorine are present.
The solar collector may be used for heating of spa or pool water, but
levels of free chlorine must not exceed 5 ppm. Otherwise, the copper
header could corrode.
NOTE: HTP DOES NOT WARRANT THE SOLAR COLLECTOR AGAINST
CORROSION-RELATED DAMAGE.
G. Freeze Protection
Freeze protection must be implemented in any regions that may
experience freezing conditions at any time throughout the year.
“Freeze tolerance limits are based upon an assumed set of
environmental conditions. Extended periods of cold weather, including
ambient air temperatures below the specied limit, may cause
freezing in exposed parts of the system. It is the owner’s responsibility
to keep the system’s freeze protection levels maintained in accordance
with the supplier’s instructions if the air temperature is expected to
approach the specied freeze tolerance limit.”
Open or closed loop systems: In areas with temperatures not falling
below 23oF, a dierential solar controller with freeze protection may
be used (e.g. requiring pump to circulate if the manifold temperature
approaches freezing). In an open loop system, a freeze valve (which
opens to allow water to dribble out) could also be considered.
Closed loop systems: In areas with temperatures falling below 23oF, a
propylene glycol / potable water mix should be used to provide freeze
protection. Please refer to glycol manufacturer’s specications about
the temperature ranges the liquid can withstand. Only food grade
propylene glycol, FDA rated as GRAS, should be used.
NOTE: HTP DOES NOT WARRANT THE SOLAR COLLECTOR AGAINST
FREEZE-RELATED DAMAGE.
H. Wind Stress
When installing the collector, please consider the issue of wind
resistance and the resultant stress on attachment points. Adhere to
relevant building codes/regulations regarding installation of such
objects.
For ush mounting on a pitched roof, a minimum of four attachment
points must be made (2 on the upper and 2 on the lower track), each
with a minimum pull strength of 220 lb. If this cannot be achieved,
additional attachment points must be made to achieve minimum
strength levels.
If installing at a raised angle (tilt-up mounts, as seen in Part 5), a
minimum of four attachment points must be made (2 on the upper
and 2 on the lower track), each with a minimum pull strength of 330
lbs. If this cannot be achieved, additional attachment points must be
made to achieve minimum strength levels.
It is the responsibility of the installation contractor to ensure that the
frame mounting is of suitable strength. Where applicable, inspection
by building department ocer or equivalent should be completed to
ensure the installation is in accordance with relevant regulations.

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6
I. Snow Load
In areas prone to heavy snowfall, the solar collectors should ideally be
installed at an angle of 50oor greater to help promote snow sliding o
the collectors. In addition, it is advisable to raise the lower collector
frame o the roof surface 6 – 8 inches or higher. Doing this places the
collector above moderate snowfall accumulation and allows drifting
snow to more easily slide out from under the collector, which helps
ensure that snow does not cover the collector array.
Please refer to local regulations regarding snow loading precautions.
J. Storage Tanks
It is recommended that the lever on the pressure and temperature
relief valves (PTRV) on main pressure hot water storage tanks be
operated once every 6 months to ensure reliable operation. It is
important to raise and lower the lever gently, and be careful as the
water released will be HOT. Failure to operate the PTRV on a regular
basis could lead to failure of the component and the possibility of the
storage tank exploding.
It is recommended, and may also be a local regulation, that, in order to
expel water safely, the PTRV have a copper pipe connected and run to
an appropriate drainage location. The PTRV and drain outlet pipe must
not be sealed or blocked.
NOTE: If the water heater is left in an operating condition and not used
for two weeks or more, a quantity of highly ammable hydrogen may
accumulate in the top of the water cylinder.
To dissipate hydrogen safely, it is recommended to turn on a hot
water tap for several minutes at a sink, basin, or bath, but not a
dishwasher, clothes washer, or other electrical or heat producing
appliance. During this process, there must be no smoking,
open ame, or electrical appliance operating nearby. Hydrogen
discharged through the tap will sound like air escaping. Failure
to dissipate hydrogen properly could result in explosion and re,
serious property damage, severe personal injury, or death.
K. Hail Resistance
Solar collectors are surprisingly strong and able to handle signicant
impact stresses once installed. Testing and impact stress modeling
proves that when installed at an angle of 40oor greater, collectors
are able to withstand impact from hail larger than 1” in diameter. The
ability of collectors to withstand hail impact is greatly inuenced by
the angle of impact, so installing the collectors at low angles does
reduce their impact resistance.
Part 3 - Installation Information
A. Transport, Unpacking, and Inspection
Solar collectors are normally transported in a protective crate. Boxes
containing the mounting assemblies will generally accompany the
collectors.
Component List
Please familiarize yourself with the components listed on the packing
list. If any components are missing, and/or additional part(s) are
required, please contact your supplier.

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7
B. Collector Dimensions and Weights
LP-364-A
01/23/17
FLOW
FLOW
SENSOR
WELL
1" FEMALE
UNION COUPLING
D
A B
E
C
1-1/4"-11 BSPP
CAP
1-1/4"-11 BSPP
CAP
1-1/4"-11 BSPP
MALE THREAD
1-1/4"-11 BSPP
MALE THREAD
Figure 1 - Collector Dimensions - Right to Left Flow Shown. Specify Right to Left or Left to Right Flow. NOTE: No more than eight (8) collectors may be
installed in an array.
Specications SS-26-FP SS-32-FP SS-40-FP
Dim. A (in.) 2.87
Dim. B (in.) 47.18
Dim. C (in.) 77.18 97.18 121.18
Dim. D (in.) 49
Dim. E (in.) 49.5
Weight (lbs.) 90 113 153
Gross Frontal Area (ft2) 25.6 31.8 39.7
Transparent Frontal Area (ft2) 23.6 29.9 37.4
Absorber Plate Area (ft2) 23.2 25.7 36.9
Fluid Capacity (Gallons) .7 1.9 1.22
Nominal Flow Rate (Gal/Min) 0.8 - 1.5 gallons per collector
Table 2 - Collector Specications and Dimensions
COLD WEATHER HANDLING - If the solar collector 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
collector.
Collector Inspection
Inspect the delivered crate and ensure all collectors are intact.
Before the freight delivery employee leaves, check boxes for
correct type and number of mounts. Note anything out of order or
suspicious on the bill of lading, even if damage is not apparent. If
damage is sucient to prevent the product’s use, it may be prudent
to not accept all or part of the shipment and immediately alert your
supplier.
NOTE: HTP DOES NOT WARRANT THE COLLECTOR AGAINST FAILURE
AS A RESULT OF DAMAGE INCURRED DURING TRANSPORT OR
INSTALLATION.
C. Tools and Materials
Make sure you have all necessary tools, materials and accessories
before beginning work on the solar system. The following is a
minimum list of basic required tools. Other plumbing components
will be eld supplied according to installation needs.
Electric Drill Drill Index (w/ 1/2”
and 3/4” Wood Bits) Torch and Striker
Putty Knife Hack Saw High Temperature
Joint Compound
Tubing Cutter Tin Snips Solder Flux
Tape Measure Emory Paper 24” Level
Extension Cord Slip Joint Pliers Needle Nose Pliers
Silicon Caulk and
Roof Tar
Pipe Wrenches, 10”
and 14” Angle Iron
Open End Wrenches
9/16 & 7/16
Screw Driver 6” Flat
Blade
Screw Driver 6”
Phillips
Wire Stripper or
Knife Wire Cutters Black Latex Outdoor Paint
Adjustable
Wrenches 8” & 10”
Aluminum Flashing
Sheet
Table 3 - Basic Required Tools
D. System Design
System design should be completed prior to installation. Solar
collectors need to be installed correctly to ensure high eciency and,
most importantly, safe and reliable operation. Please seek professional
advice for the design and installation of your solar heating system.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
8
E. Delta-T Controller Settings
Usually a Delta-T ON value of 8 – 20oF and Delta-T OFF value of 4 -
10oF is appropriate. These settings may need to be altered slightly
according to location and system design. Refer to the instruction
manual provided with the chosen solar controller for appropriate
settings.
F. Stagnation and Overheating
Stagnation refers to the condition that occurs when the pump stops
running. This can be due to pump failure, power blackout, or as a result
of a high tank temperature protection feature built into the controller
which turns the pump o.
If the system is designed to allow stagnation as a means of preventing
tank overheating, the collector and plumbing in close proximity may
reach temperatures greater than 395oF; components that may be
exposed to these high temperatures, such as valves, plumbing, or
insulation, should be suitably rated.
If the system is designed to allow stagnation of the collector when the
tank reaches a set maximum level, steam may form in the collector(s).
In such a system, temperature relief valves or auto air vents should
be isolated (using an isolation valve) on the collector outlet, as these
options may not be able to withstand the high temperatures and allow
stable stagnation of the collector (may dump hot water).
In the event of component failure or extreme conditions, the PTRV on
the hot water storage tank may open as a safety measure. Under such
conditions, the collector will normally reach a maximum temperature
of around 395oF. Any heat returning from the collector is generally
not enough to cause a continued increase in tank temperatures (e.g.
heat input is less than tank heat losses), and therefore is able to meet
requirements in some regions limiting hot water dumping. A crackling
noise may be heard coming from the supply line when hot water is
used as the pressure in the system drops and steam forms. This is
normal.
G. Sizing System to Avoid Overheating
The system should be sized so that overheating of the tank is dicult
to achieve in a single day, even during hot, sunny periods. If the system
is oversized, such that excessive heat is often produced during summer
months, consider installing a drain back system, a heat dissipater
unit, and carefully review the points in Part 3, Section H, Preventing
Overheating.
H. Collector Angle, Plane, and Direction
1. Collector Direction
The collector should face the equator. In the northern hemisphere,
this is due south, and in the southern hemisphere, due north. Facing
the collector in the correct direction and angle is important to ensure
optimal heat output. A deviation of up to 15ofrom due south is
acceptable, and will have minimal eect on heat output.
NOTE: In Figure 2, D orientation (landscape) is not recommended for
drain back systems.
Mounting Methods:
A, B - Sloped Roof
C - Flat Roof
D - Ground Mount
E - Facade
Figure 2 - Suggested Solar Collector Mounting Designs
2. Collector Angle (Tilt)
It is common for collectors to be installed at an angle that corresponds
to the installation latitude.While adhering to this guideline, an angle of
latitude +/- 10ois acceptable, and will not greatly reduce solar output.
The solar collector should be installed at an angle between 20 – 80oto
ensure optimal operation.
For year-round domestic hot water, the collector should be tilted to
an angle of equal to the latitude of the installation site. Add 15oto the
latitude to optimize for winter performance (space heating). Subtract
15ofrom the latitude to optimize for summer performance (indirect
pool heating).
Given the formula above, a solar collector installed at 30oN latitude
should face due south at an angle of 45ofor wintertime advantage,
and 15ofor summertime heating.
Preventing Overheating
To reduce summer heat output, angle the collector for optimal
winter absorption. This is achieved by installing the collector at
an angle of around 15oabove the latitude angle (e.g. 45oat 30oN
latitude). This angle corresponds closely to the angle of the sun in
the sky during the winter months, thus maximizing winter output.
Conversely, during the summer when the sun is high in the sky,
the relative collector surface area exposed to sunlight is reduced,
cutting overall heat production considerably (by about 15%). This
option is ideal for installations where solar thermal is being used for
space heating.
3. Collector Plane (Horizontal or Vertical)
The collector could be installed vertically, but may be installed at an
angle, such as sideways on a pitched roof. It is not recommended
to install a drain back system in the horizontal or landscape style. In
vertical installations, collectors should be installed with a 1/4” pitch
towards the supply port to facilitate the drain back process. See
more detail in Part 2, Section D, Number 3.
I. Avoid Shade
Collectors should be located so that shading does not occur between
9 AM and 3 PM local time. Partial shading due to small objects such
as antennas and ues is not of great concern.
J. Location
To avoid long pipe runs, the collector should be positioned as
close as possible to the storage tank. Storage tank location should
therefore be considered part of the location requirements of the
solar collector. The storage tank should be located as close as
possible to the most frequent draw o points in the building.
K. Expansion Tank
Expansion of HTF occurs as it heats. When HTF expands, it has to
be controlled, as uid cannot be compressed like air. A properly
sized and installed expansion tank can accommodate expansion
of HTF. If the expansion tank fails, a properly sized and installed
PTRV will activate and protect the system. Failure to properly
control HTF expansion may result in property damage, personal
injury, or death.
See the following requirements for expansion requirements specic
to application.
NOTE: Only authorized licensed contractors are permitted to install
the solar collector.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
9
1. Open Loop Systems
Open loop systems have a check valve/non-return valve on the cold
main. Expanded water is released via the PTRV, which is mounted
on the tank or solar collector loop. To prevent wasteful dumping
of water, it is required to install a potable water expansion tank on
open loop systems.
2. Closed Loop Systems
Closed loop systems should always be installed with a solar
expansion tank. Refer to the solar expansion tank manufacturer’s
guidelines regarding correct sizing.
3. Drain Back Systems
Expansion tanks are not required in drain back system design.
L. Lightning Protection
To avoid lightning related damage or electrical safety issues, it is
advisable to earth/ground the frame and copper circulation loop of
the collector.
M. Pipe Sizing and Connections
HTP solar collectors are provided as standard with 1” copper pipe
ports. For domestic heating applications with 1 or 2 collectors,
nominal 1/2” piping is suitable. For applications using 2 - 4 solar
collectors in series, it is advised to use nominal 3/4” piping. For 5 – 8
collectors, use 1”pipe. For drain back systems, use 3/4” pipe for 1 – 4
collectors and 1” pipe for 5 – 8 collectors. In connections of banks of
collectors, larger pipe sizes should be used as required for the given
application, with consideration given to ow rates, pressure drops,
and pump sizing.
The material used for the solar loop must be able to withstand the
operating temperatures and pressures to which the system may
be exposed due to normal or extraordinary conditions (e.g. pump
failure or power outage). Copper or stainless steel pipe is the most
widely used piping material for solar applications.
N. Connection of Multiple Collectors
The maximum number of collectors that can be connected in
series is 8. If the entire installation requires more than 8 collectors,
use parallel strings of an even number. If even numbers cannot be
achieved on parallel strings, ow balancing valves must be installed
to ensure each collector has the same ow.
In drain back systems, supply and return connections to the collector
must use eccentric ttings or a tting arrangement that allows full
draining of header pipes. The collector or array should be mounted
with a 1/4” pitch towards the supply port to facilitate the drain back
process. In addition, collector plumbing should slope toward the
drain back reservoir at 1/4” per foot minimum to allow the system
to drain. If continual slope is not achievable, consider a pressurized
closed loop system.
O. Potable Water
If the system is open loop direct ow, meaning that potable water is
owing through the collector, any components used in the system
must meet potable water requirements.
P. Mounting Frame
Four mounting choices are available for HTP solar collectors: Tilt
mounts or 2/3 mounts, ush mounts, or rack mounts (see Part
4). Feet are supplied to fasten the panel securely to the roof. It is
important that frame attachment points and externally supplied
fasteners are of suitable structural strength and corrosion resistance.
Be sure to tighten all hardware securely.
Q. Galvanic Reaction
Zinc galvanized components should NOT be installed in direct
contact with stainless steel or aluminum, as galvanic reaction
between metals can cause premature oxidation of the zinc coating,
as well as the steel and aluminum underneath, leading to premature
solar system failure and property damage. Such damages ARE NOT
covered by product warranty.
Avoid using galvanized steel bolts. Use stainless steel components
instead. If galvanized components ARE used, avoid direct contact
between two metals by using rubber/plastic separators.
If roof surface is galvanized steel, refer to manufacturer’s corrugated
roof installation guidelines.
Part 4 - Mounting Installation
A. Mount Types
HTP oers three types of mounting assemblies.
1. Tilt Mount (Part # 8600P-002) or 2/3 Mount (8600P-691)
Tilt or 2/3 mounts are most commonly used on at roofs. These
mounts can be adjusted to an angle to maximize collector eciency.
HTP’s tilt or 2/3 mounts consist of four hinged triangle feet that, when
combined with a rear strut (Part # FP-ST), can create a panel tilt or
inclination of up to 60o. The rear strut determines the degree of tilt,
and can be cut to the appropriate size.
2. Flush Mount (Part # 8600P-012)
Often called direct mounts, ush mounts are often used on a sloped
roof that is within 15oof latitude. Flush mount feet raise the collector
3” from the mounting surface. If roof pitch is insucient, a tilt mount
may be necessary.
3. Rack Mount (Part # 8600P-014)
Rack mounts are used to attach collectors to a metal frame (such as
Uni-Strut). These mounts can also be used to attach collectors directly
to the roof. However, this is unadvisable, as rack mounts install close to
the roof surface and allow collectors to collect leaves, snow, and other
debris.
B. General Mounting Information
Mounts should be attached to collectors as close to symmetrically
as possible. Mounting clamps should be attached to the collector
between 4” and 10” from corners if installed vertically, and 4” and 16” if
installed horizontally. See below for detail.
Figure 3 - Solar Collector with Acceptable Mounting Locations
Ensure the roof surface is solid and able to withstand in excess of
330 lbs of pull force that may be encountered during high winds.
Consult a structural engineer if in doubt. Failure to do so could result
in property damage, severe personal injury, or death.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
10
Tilt Mounts (Part # 8600P-002)
The tilt mount package contains
enough hardware to secure one
collector.
Each set contains:
• Six (6) Tilt hinges, each
with ¼” #20 stainless steel
set screws, pre-installed
• Four (4) Triangle mounting
feet
• Four (4) 1 ¾” x 3/8” – #16
stainless steel bolts
• Two (2) 4” x 3/8” – #16
stainless steel bolts
• Six (6 each) 3/8” stainless
steel nuts and washers
Triangle Mounting Feet
Mount triangle feet to structure
or Uni-Strut at proper spacing
according to collector size (see
Figure 3 for spacing). The triangle
mounting feet can be fastened
to Uni-Strut or directly to the roof
using appropriate fasteners and
sealant.
Front Mounts
Fully loosen the tilt hinge set
screws. Once loosened, the tilt
hinge will engage into the Quick
Lock frame rail. Slide the ush
mount to the desired location
along the bottom side of the
collector that will meet the roof.
Tighten the screw to keep hinge
from sliding. See Figure 3 for
mounting locations.
Next, attach the triangle foot to
the tilt hinge with the 1 ¾” x 3/8”
bolt, 4” x 3/8” bolt, and 3/8” nut
and washer.
Rear Mounts
Fully loosen the tilt hinge set
screws. Slide the tilt hinges to
desired location along the top
side of the collector.
Leave a 1” space between the tilt
hinges. Tighten set screw with a
7/16” wrench to a maximum of
10 foot pounds to lock the ush
mount into position.
Position the E1022 struts between
the two tilt hinges on each side
and align the hole in the strut with
holes in the tilt hinge. Insert the 4”
x 3/8”bolt through all three pieces
and secure with a 3/8” nut and
washer.
Position the E1022 strut into the
triangle foot and align the hole
in the strut with the holes in the
triangle foot. Insert the 1 3/4” x
3/8” bolt and secure with a 3/8”
nut and washer.
Check for collector alignment and
tighten all fasteners.
Use Table 4 to determine the
length of the rear strut.
Rear Strut Length at Selected Angles
Collector
Tilt
SS-32 Base Dim.
98.18”
SS-40 Base Dim.
122.18”
30o53” Strut Length E-E 65”Strut Length E-E
35o61” Strut Length E-E 75”Strut Length E-E
40o69” Strut Length E-E 86”Strut Length E-E
45o77” Strut Length E-E 96”Strut Length E-E
50o85” Strut Length E-E 105” Strut Length E-E
55o93” Strut Length E-E 115” Strut Length E-E
60o100” Strut Length E-E 124” Strut Length E-E
C-C of holes, subtract 1”
E-E = end to end. C-C = center to center.
Table 4 - Rear Strut Length Chart

lp-364 Rev. 000 Rel. 007 Date 2.12.18
11
2/3 Mounts (Part # 8600P-691)
The 2/3 mount package contains
enough hardware to secure one
collector.
Each set contains:
• Four (4) triangle mounting
feet
• Two (2) tilt hinges
• Two (2) 2/3 side brackets
• 1/4” – Four (4) stainless
steel set screws, pre-
installed per ush mount
• Six (6) 3/8-16 X 1 3/4
Screws
• Six (6) 3/8 at washers and
nuts
Triangle Mounting Feet
Begin by mounting the front
triangle feet to structure at proper
spacing according to collector
size (see Figure 3 for spacing). The
triangle mounting feet can be
fastened directly to the roof using
appropriate fasteners and sealant.
Set the collector onto the triangle
mounting feet and tighten the set
screws.
2/3 Side Mounts
Loosen the set screws fully on the
side mounts. Once loosened, the
side mounts will engage into the
Quick Lock frame rail. Slide the
side mounts to desired location.
See Table 5 for proper 2/3 side
mount location. Tighten set screw
with a 7/16”wrench to a maximum
of 10 foot pounds to lock the ush
mount into position.
Position the E1022 strut into the
side mount and align the hole
in the strut with the holes in the
mount. Insert the 1 3/4” x 3/8” bolt
and secure with a 3/8” nut and
washer. Mount strut into triangle
mounting feet. Repeat for other
strut.
Mount the triangle feet to the
structure using appropriate
fasteners and sealant.
Check for collector alignment and
tighten all fasteners.
Side Mount Location for Selected Models
Collector Model Side Mount Location
(From Bottom of Collector)
SS-26-FP 51.5”
SS-32-FP 64.8”
SS-40-FP 80.8”
Table 5 - Side Mount Location
Flush Mounts (Part # 8600P-012)
The ush mount package
contains enough hardware to
secure one collector.
Each set contains:
• Four (4) Flush mounts
• 1/4” – 20 stainless steel
set screws, pre-installed
per ush mount
Mounting the Flush Mounts
Loosen the set screw fully.
Once loosened, ush mount
will engage into the Quick Lock
frame rail. Slide the ush mount
to desired location.
Tighten set screw with a 7/16”
wrench to a maximum of 10 foot
pounds to lock the ush mount
into position.
The ush mounts can be
fastened to Uni-Strut or directly
to an asphalt roof using the
appropriate fasteners and
sealant. See Figure 3 for proper
placement of ush mounts.
Rack Mounts (Part # 8600P-014)
Each rack mount package
contains enough hardware to
secure one collector.
The set contains:
• Four (4) Rack mounts
• 1/4” – 20 stainless steel
set screws, pre-installed
per ush mount
Fully loosen the set screw. Once
loosened, the rack mount will
engage into the Quick Lock
frame rail. Slide the rack mount
to the desired location.
Tighten set screw with a 7/16”
wrench to a maximum of 10 foot
pounds to lock the rack mount
into position.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
12
Part 5 - Roof / Wall Mounting Suggestions
Working on the roof is extremely dangerous. Plan the installation
carefully such that a safe distance from the edge can be maintained.
Sure footing is also required. Be sure to wear sturdy, rubber soled
shoes. NO SANDALS OR FLIP FLOPS. Harnessing equipment for fall
prevention is mandatory.
Be sure that the roof is dry before beginning installation. Be sure
that any ladders are set rmly against the side of the building and
mounted properly. Have someone hold the ladder for you while you
climb.
Be aware of any electric or water lines before drilling into the roof.
Plan the installation accordingly.
The following details suggested roof attachment methods:
J Bolt Penetration
Lag Bolt Penetration
Threaded Bolt Penetration
A. Roof Mounting
In order to meet strength requirements in areas with winds up to 130
mph and category “D” exposure, collectors should be mounted into
roof studs using lag threaded bolts or J bolts. Any other installation
format should be approved by a structural engineer.
Detail of Roof Mount
Example of Roof Flashing
Failure to follow this information could result in property damage,
serious personal injury, or death.
Ensure the roof surface is solid and able to withstand in excess of
330 lbs of pull force that may be encountered during high winds.
Consult a structural engineer if in doubt. Failure to do so could
result in property damage, severe personal injury, or death.
B. Wall Mounting
Wall attachment methods depend largely on wall material. For brick
or concrete walls, secure collector feet with stainless steel expansion
bolts. For wood or synthetic boarding, stainless steel screws that can
penetrate into the wall framework may be suitable for mounting. If
the strength of these screws is a concern, use bolts that run directly
through the wood with a large washer or metal plate positioned
before the nut.
Consider possible shading from eaves, particularly in the summer.
Strategic shading may be included in system design to minimize
summer heat output. Another advantage of installing under an eave
overhang is to minimize snow buildup on the collector in areas with
regular snowfall.
If installing on a wall such that the collector is above a walkway,
please consider snow and where it will collect when it slides o the
collector.
When attaching to the roof surface, it is important to ensure proper
sealing to prevent water penetration. It is also important to consider
the building structure and roof construction type to ensure the
structure is adequate for the collector’s weight and can withstand
wind loads as determined by local codes. For commercial buildings,
it is especially recommended to consult a structural engineer.
When installing a collector that will be raised and not ush to the
roof, the increase in wind stress at the mounting points must be
considered. Consult local wind load requirements.
Use larger stainless steel lag bolts to fasten the collector feet to a at
roof. If standing water may gather on the roof around the collector,
ensure that all mounting and plumbing holes are thoroughly sealed
and waterproofed.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
13
Always consider the weight of the collector and the structural
integrity of the wall before installation. HTP requires that
installations be inspected and approved by authorized building
inspectors and comply with local and state codes BEFORE
commissioning the system. Failure to do so could result in
property damage, severe personal injury, or death.
Part 6 - Plumbing Connections
A. Temperature Sensor Insertion
Temperature sensor wells are located on either side of the collector.
Insert the sensor into the well below the hot out port. Ensure that
the sensor and cable used on the collector are high temperature
rated (up to 395oF). The sensor cable should not come in direct
contact with the piping.
Ensure that any pipe insulation is watertight. Use silicone sealant to
ensure a watertight seal against the collector.
LP-364-B
01/27/17
Figure 4 - Sensor Cable Detail
B. Header Connection
Never use dielectric unions or galvanized steel ttings when
connecting to a stainless steel storage tank or heater. Use only
copper or brass ttings. Teon thread sealant must be used on
all connections. Failure to follow this information could result in
premature product failure and property damage. Such damages
ARE NOT covered by product warranty.
Non-Galvanized Connections / Pipe Fitting
To ensure a sound seal, use plumbing thread glue or Teon tape
approved for use in glycol based systems. Tighten using two
wrenches, taking care not to stress the copper pipe. Do not over
tighten.
Brazing/Sweating/Soldering to the collector is acceptable, but not
recommended, as doing so can damage the header grommet. Care
must be taken to avoid exposing the silicone rubber seal to the torch
ame. Ideally, place a wet cotton cloth against the rubber seal to
prevent heat damage.
C. Air Purge
Once the inlet and outlet are connected to the plumbing system,
the collector loop should be purged of air.
1. Open Loop
For a system without an auto-air vent, a drain valve on the supply
line should be installed along with a ball valve or a metal coin vent
on the tank side. With the ball valve closed, the drain valve can be
opened to allow air to escape as water pressure forces through the
line.
When opening the drain valve, released water may be hot. Steam
may release as well. Failure to take caution when opening drain valve
could result in serious personal injury or death.
Once the drain valve no longer releases air, close it. Then open the ball
valve so normal operation may begin.
If an auto-air vent is installed on the outlet of the collector, air will
automatically eliminate from the solar line. If using a manual air vent,
open it until all air is eliminated.
2. Pressure Open Loop
Run the pump at the highest speed setting, forcing air out of the
collector and back into the tank. If an auto-air vent is installed on the
outlet of the collector, air will automatically eliminate from the solar
line. If using a manual air vent, open it until all air is eliminated.
3. Closed Loop
The solar loop may be lled with potable water or a glycol / potable
water mix, unpressurized (drain back system), or vented and
pressurized. The exact process will depend on the design of the loop
and components used.
NOTE: A drain back system does not need to be purged.
D. Plumbing Check
Water vapor may appear on the inside of the collector glass when
initially installed. This is not a problem and will disappear after a few
days of operation. Consult your dealer or factory representative if
water vapor does not clear up after a week of sunny weather.
E. Glycol Freeze Protection
Only use food grade propylene glycol, FDA rated as GRAS (Generally
Recognized As Safe), with additives that provide resistance to
breakdown during high temperatures. Glycol pH should be checked
periodically and replaced as specied by the manufacturer.
F. Insulation
Heavily insulate all piping running to and from the collector with high
quality insulation of at least 0.6” thickness (thicker in cold climates).
Heat loss from the piping can be signicant. Particular attention should
be taken to insulate any possible points of heat loss. Insulations should
have a temperature rating of 250oF.
Ensure the insulation is tight against the collector casing, thus
minimizing heat loss from the inlet and outlet. High quality silicone
sealant should be used to prevent water from entering the temperature
probe port and/or in between the piping and insulation foam.
Insulation foam exposed to direct sunlight should be protected against
UV related degradation by wrapping/covering with UV protective
material, such as adhesive back aluminum foil, PVC wrap, or similar.
For systems designed to allow stagnation, high temperature rated
insulation such as glass wool or mineral wool should be used on
piping close to the collector (6’). Glass wool insulation may come with
an external foil wrap, but any cuts made during installation should be
sealed with watertight, UV stabilized material, such as adhesive backed
aluminum foil or PVC wrap.
Circulating pump volumes can be a source of signicant heat loss and
should be insulated. Some pumps come standard with a molded foam
casing which has good insulation properties. If the pump does not
have any insulation, the same foam insulation used on the pipe can
be used to cover the pump. This insulation should be secured in place
with good quality nylon cable ties or adhesive tape.
NOTE: Certain pumps are not designed to be insulated. Please contact
the pump manufacturer if in doubt.
All internal and external piping should be insulated. This includes at
least the 3” closest to the hot water outlet of the tank, as this copper
pipe is a signicant point of passive heat loss.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
14
G. Pump Selection
When selecting a pump, there are two basic
solar designs to consider: pressure glycol and
closed loop drain back.
In pressure glycol systems, two factors
determine pipe size. These are:
• Flow rate in gpm (gallons per minute)
• Head loss
In drain back systems, an additional factor
must be considered along with the previous
two:
• Lift
Each collector has a nominal ow rate of
between .8 and 1.5 gpm.
When determining head loss, consider the
following:
• Head loss pumping through the
collector(s)
• Head loss pumping through piping
and ttings
• Head loss pumping through a heat
exchanger
40
32
26
Table 6 - Pressure Drop Chart - Applies to 1 to 8 Collectors. Do Not Multiply for Multiple Collectors
• *Drain back only: Determine the vertical lift from the water level in the drain back tank to the top of the solar panels (vertical lift is the
same as head loss).
Refer to the chart below for pressure drop gures with a 40% glycol solution. When using potable water as HTF, there is a further 20%
reduction in pressure drop.
NOTE: To convert psi to head feet, multiply psi by 2.31 and divide total by specic gravity (1 for water, 1.02 for 30% propylene glycol, 1.04 for
50% propylene glycol).
NOTE ON CHART (Table 6): To determine feet of head, multiply pressure drop by 2.31.
For example:
1. SS-40-FP at 3 gpm = 1.5 per panel and .071 psi = .071 for 2 panels at 3 gpm.
2. SS-40-FP at 12 gpm = 1.5 per panel and .071 psi = .071 for 8 panels at 12 gpm.
After determining gpm ow rate and total system head loss, a properly sized pump can be chosen. See recommendation from pump supplier
to determine the proper pump for your job. Incorrect pump size will reduce or fail to deliver solar contribution.
To further increase solar production, use a variable speed solar pump controller (part # 8600-047).

lp-364 Rev. 000 Rel. 007 Date 2.12.18
15
Part 7 - System Piping Applications
Figure 5 - System Piping Applications
A. Reverse Return
In Figure 6 you will nd suggested collector piping diagrams utilizing reverse
return for balanced ow:
NOTE: Landscape or horizontal examples not recommended for drain back
systems.
Figure 6 - Reverse Return Piping Applications
Figure 7 - Balanced Flow Meter Piping Applications
B. Balance Flow Valves with Meters
Below you will nd suggested collector piping diagrams using balance ow
valves and meters for balanced ow. The following congurations may not
work in drain back systems. These drawings can be applied to various system
congurations, but may not meet certain requirements.
C. Pressure System Plumbing Panel Attachment
See the following diagram for examples of panel plumbing attachments for
pressure systems. This diagram can be used for either vacuum tube or at plate
collectors. The collector can be plumbed from left to right or right to left. Note
the air purge is on the hot out pipe. For collectors with 1” male threaded tting
(NPT), use high-temperature thread sealant that can be used with glycol. For
collectors with 1” copper pipe, sweat a 1”sweat-to-male pipe thread.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
16
Figure 8 - Plumbing Collector Attachments, Including Pressure Systems.
Feed Elbows are usually installed on the bottom of at plate collectors.
Part 8 - Maintenance
Under normal conditions the solar collector is maintenance free. Other
system components, such as the pump and glycol (if used) may require
periodic inspection and changing/maintenance. Please refer to the
documentation provided by the manufacturers of these components.
NOTE: Apart from those maintenance items outlined below, any
system inspection, maintenance, or repair should only be completed
by authorized persons. The solar collector warranty coverage MAY BE
VOIDED if non-authorized persons attempt to maintain or repair the
solar collector or associated components.
THE FOLLOWING BASIC MAINTENANCE MAY BE COMPLETED BY
THE HOME OWNER:
A. Cleaning
Regular rain should keep the collectors clean. However, if the collectors
are particularly dirty, wash with a soft cloth and warm, soapy water or
glass cleaning solution, ONLY if the collector is located in a position
which DOES NOT require climbing onto the roof or use of a step ladder.
If the collectors are not easily and safely accessible, high pressure water
spray is also eective.
If cleaning is required and the above outlined methods are not suitable,
the company that supplied and installed the solar collector should be
contacted.
THE FOLLOWING MAINTENANCE MAY ONLY BE COMPLETED BY
AUTHORIZED PERSONS:
B. Insulation
The pipes running to and from the collector should be heavily insulated.
This insulation should be checked periodically (at least once every
3 years) for damage. For any insulation exposed to sunlight, ensure
protective cover/wrap/foil is in good condition. Replace as required.
Draining the collector must be done with caution, as released
water may be scalding hot. Take care when opening the drain
valve. Failure to do so could result in property damage,serious
injury, or death.
E. Other Components
Other parts of the system, such as the pump and storage tank,
should be serviced/inspected according to the manufacturer’s
maintenance guidelines.
C. Draining the Collector
If maintaining the system, or in preparation for extremely cold
conditions (extended snow cover), draining of the collector may be
required. To drain the collector of fresh water (open loop, direct ow
system):
1. Turn o the water supply to the solar storage tank.
2. If the storage tank or other system components are being
concurrently drained, refer to their instruction manuals for details. If
storage tank is not being drained, isolate piping to and from the solar
collector (isolation valves should already be installed). Immediately
open drain valves on both lines (or undo ttings). Never leave the
isolation valves in the o position while the collector is full of water
and exposed to sunlight. The water will heat and cause a pressure
increase which may rupture ttings/connections.
NOTE: In good weather the water may be hot or have built up pressure,
so take care when opening the drain valve.
3. Allow the manifold to sit in a vented state for 5 – 10 min to boil dry
(may take longer in poor weather).
4. Always leave one drain valve or tting open. Otherwise the system
may build up pressure when it heats. For draining of other types of
systems, please refer to specic instructions for the system.
D. Stagnation
Drain back systems - These systems may be stagnated.
Pressure glycol systems -If left unattended for a signicant length
of time (greater than 14 days) such as during a vacation, the system
will need a heat dump, a cover for the collector array, or to be
drained to prevent stagnation damage. Many solar controllers have
a vacation mode that allows for dumping the daily collected heat
each night. See controller instructions.
Part 9 - Troubleshooting
Inspection items marked with an (H) may be completed by the
homeowner, but only if investigation is clearly SAFE and EASY. Any
information obtained during an investigation can then be relayed
to the company that supplied and installed the system. Any other
system troubleshooting, adjustments, or repairs may be completed
ONLY by authorized persons.
A. No Hot Water
If there is no hot water, the problem will generally be related to the
gas or electric heating system, not the solar collector. The collector
simply pre-heats water, with nal boosting completed by the electric
element or gas booster system. For a retrotted solar system, please
contact the manufacturer/installer of your gas/electric water heater.
For a new solar water heating system, please contact the company
that supplied and installed the system.
B. Reduced Solar Contribution
Solar contribution is directly related to the amount of solar radiation
and the volume of hot water used. During the winter and periods
of rainy or particularly overcast weather, the amount of energy
produced by the solar collector will be greatly reduced.
As a general rule, the solar collector is sized to provide close to 100%
of your summer hot water needs, which, depending on your location
and hot water usage patterns, may result in between 40% - 70% of
your annual hot water energy needs. During the winter, increased
cloud cover and reduced solar radiation levels may result in solar
contribution as low as 20%. This is normal.
If, given similar environmental conditions, you feel the solar
contribution (as indicated by energy savings) has considerably
reduced, there may be a problem with your solar heating system.
This may be due to an incorrectly congured controller, pump
malfunction, or problem with the boosting system. In such cases,
please contact the company who supplied and installed the system.
INVESTIGATION
(H) 1. Does the circulation pump appear to be operating? In sunny
weather, the circulation pump should come on for 1 – 2 minutes
every 3 – 5 minutes. The pump may run very quietly. You may need
to touch the pump, or piping running to and from the pump, with a
solid object to feel for motor operation (slight vibration). NOTE: DO
NOT USE FINGERS! THE PUMP MAY BE HOT!

lp-364 Rev. 000 Rel. 007 Date 2.12.18
17
Part 10 - Installation Checklist
The following list is a guide only. Specic items will depend on the nature of the installation.
Item Ye s No
Collector faces due North/South as closely as possible
Collector is not signicantly shaded throughout the day.
Collector is not likely to be struck by falling objects such as branches or falling fruit.
Collector is installed at an angle of 20-80o, preferably at a latitude angle.
Collector is installed at an angle of 40oor greater in areas prone to large hail (>3/4”).
Frame is secured to structurally sound roof/wall.
Plumbing is leak free.
Plumbing pipe runs are well insulated.
Insulation above roof level is protected against sunlight with foil wrap or equivalent.
Controller is congured correctly with freeze setting (if required).
System is tted with pressure relief valve on the collector outlet and/or storage tank.
Pressure relief valve will dump only onto high temperature resistant material and will not pose a danger of scalding people.
Pump, controller, and all electrical connections are protected from water.
Collectors have been cleaned.
Installation record form has been given to customer and basic operation explained.
Functional checks for controller and pump have been completed.
Water quality has been checked.
Collector loop piping has been ushed and cleaned.
During normal daily hot water use, if the temperature relief valve on the tank or collector is regularly dumping hot water (more than just a
dribble), there may be a problem with the system.
POSSIBLE CAUSES
1. The system has been sized incorrectly (oversized). This will be most apparent in the summer months, when solar radiation levels are high.
2. A problem exists with the electric heating thermostat (electric boosting only).
3. Check expansion tank size. If undersized, water expansion may cause the relief valve to activate.
INVESTIGATION
(H) To test the system, run the hot water tap in the bathroom or kitchen for 5 minutes to release some heat from the system (CAUTION: THE
WATER WILL BE HOT. BE CAREFUL.) After this period, if the tank or collector still regularly dumps hot water, there is a problem. Please contact
the company who supplied and installed the system to organize a service call.
Table 7 - Installation Checklist - All Items Should be Checked“Yes” for Installation to be Considered Completed Satisfactorily
C. Regular Water Dumping
(H) 2. Are there any apparent leaks in the plumbing to and from the collector? Any water trails down the roof, or around the storage tank?

lp-364 Rev. 000 Rel. 007 Date 2.12.18
18
Flat Plate Solar Collector
Ten (10) Year Limited Warranty
For Residential and Commercial Use
HTP warrants each at plate solar collector to be free from defects in
materials and workmanship according to the following terms, con-
ditions, and time periods. UNLESS OTHERWISE NOTED THESE WAR-
RANTIES COMMENCE ON THE DATE OF INSTALLATION. This limited
warranty is available to the original consumer purchaser (hereinafter
“Owner”) of the solar collector, and is transferable to any subsequent
owners of the solar collector for a total of ten (10) years. This limited
warranty extends to solar collectors installed for use in medium tem-
perature range applications (110 to 210oF ONLY). This warranty cov-
ers the at plate solar collector and its components ONLY.
COVERAGE
A. Should a defect or malfunction result in a leakage of water
or degradation of the collector absorber surface in such a way as
to signicantly aect collector performance within the above-
stated warranty periods due to defective material or workmanship,
malfunction, or failure to comply with the above warranty, with
such defect or malfunction having been veried by an authorized
HTP representative, HTP will repair or replace the defective or
malfunctioning solar collector with a replacement solar collector of
the nearest compatible model available at the time of replacement.
Replacement parts or collectors shall be warranted for the remainder
of the original warranty.
B. In the event of a failure of a replacement solar collector due
to defective material or workmanship, malfunction, or failure to
comply with the above warranty, HTP reserves the right to refund
to the Owner the published wholesale price available at the date of
manufacture of the original solar collector.
C. If government regulations, industry certication, or similar
standards require the replacement solar collector or component(s)
to have features not found in the defective solar collector or
component(s), the Owner will be charged the dierence in price
represented by those required features. If the Owner pays the price
dierence for those required features or other features available on
a new replacement solar collector or component(s), the Owner will
also receive a complete new limited warranty for that replacement
solar collector or component(s).
D. If at the time of a request for service the Owner cannot provide a
copy of the original sales receipt or the warranty card registration,
the warranty period for the solar collector shall then be ten (10) years
from the date of manufacture of the solar collector and NOT the date
of installation of the solar collector.
E. This warranty extends only to solar collectors utilized in heating
applications that have been properly installed by qualied
professionals based upon the manufacturer’s installation instructions.
F. It is expressly agreed between HTP and the Owner that repair,
replacement, or refund are the exclusive remedies of the Owner.
G. HTP will not accept claims from the Owner for labor costs incurred
by any person as a result of the repair, replacement, removal, or
reinstallation of a solar collector or any component thereof.
OWNER RESPONSIBILITIES
The Owner or Installer must:
1. Operate the solar collector in a solar water heating system installed
in accordance with federal, state, and local codes.
2. Operate the solar water heating system at pressures below that
shown on the solar collector rating label.
3. Keep the solar collector free of damaging scale deposits.
4. Make provisions so if the solar collector or any component part or
connection thereto should leak, the resulting ow of water will not
cause damage to the area in which it is installed.
5. Maintain the solar collector in accordance with the maintenance
procedure listed in the manufacturer’s provided instructions.
6. Maintain all related system components in good operating
condition.
7. Use the solar collector in an open system, or in a closed system
with a properly sized and installed thermal expansion tank.
WARRANTY EXCLUSIONS
This limited warranty will not cover:
1. Any solar collector purchased from an unauthorized dealer or
online retailer.
2. Any solar collector not installed by a qualied heating installer/
service technician, or installations that do not conform to ANSI,
CSA, and/or UL standards, as well as any applicable national or local
building codes.
3. Service trips to teach you how to install, use, maintain, or to bring
the solar collector installation into compliance with local building
codes and regulations.
4. Failure to locate the solar collector in an area where leakage of the
tank or water line connections and the relief valve will not result in
damage to the area adjacent to the solar collector or lower oors of
the structure.
5. Any failed components of the solar water heating system not
manufactured by HTP as part of the solar collector.
6. Solar collectors repaired or altered without the prior written
approval of HTP.
7. Damages, malfunctions, or failures resulting from improper
installation, or failure to install the solar collector in accordance
with applicable building codes/ordinances or good plumbing and
electrical trade practices; or failure to operate and maintain the
solar collector in accordance with the manufacturer’s provided
instructions.
8. Damages, malfunctions, or failures resulting from failure to operate
the solar collector at pressures not exceeding the working pressure
shown on the rating label.
9. Failure to operate the solar collector in an open system, or in a
closed system with a properly sized and installed thermal expansion
tank.
10. Failure or performance problems caused by improper sizing of
the solar collector, expansion device, or piping.
11. Damages, malfunctions, or failures caused by operating the solar
collector with modied, altered, or unapproved parts.
12. Damages, malfunctions, or failures caused by abuse, accident,
re, ood, freeze, lightning, acts of God and the like.
13. Failures (leaks) caused by operating the solar collector in a
corrosive or contaminated atmosphere.
14. Failure of the solar collector due to the accumulation of solid
materials and lime deposits.
15. Any damage or failure resulting from improper water chemistry.
WATER CHEMISTRY REQUIREMENTS – Water pH between 6.5 and 8.5.
Hardness less than 7 grains (120 mg/L). Chloride concentration less
than 100 ppm (mg/L). TDS less than 500 ppm (mg/L).
16. Any damages, malfunctions, or failures resulting from the use of
dielectric unions.
17. Production of noise, odors, discoloration, or rusty water.
18. Solar collectors replaced for cosmetic reasons.
19. Components of the solar collector that are not defective, but must
be replaced during the warranty period as a result of reasonable
wear and tear.
20. Damages, malfunctions, or failures resulting from the use of any
attachment(s) not supplied by HTP.
21. Solar collectors installed outside the fty states (and the District
of Columbia) of the United States of America and Canada.
22. Solar collectors moved from the original installation location.
23. Solar collectors that have had their rating labels removed.
24. Solar collectors with broken glass.
25. Solar collectors installed as a roof membrane or integral part of an
existing roof membrane.
26. When installed in a system using a glycol based heat transfer

lp-364 Rev. 000 Rel. 007 Date 2.12.18
19
liquid and the solar collector is left exposed to daily sunlight without
hot water usage or eective heat dissipation, such that the collector
dry stagnates, with the exception of stagnation due to system
component failure or power outage, where the system failure is
remedied within forty eight (48) hours of occurring, and;
27. Solar collector(s) left dry (no liquid circulation) and exposed to
daily sunlight (not covered) for a period of time exceeding fourteen
(14) consecutive days.
28. Any labor charges incurred by any person in connection with the
examination or replacement of a solar collector or parts claimed by
the Owner to be defective.
PROCEDURES FOR WARRANTY SERVICE REQUESTS
Any claim for warranty assistance must be made immediately upon
nding the issue. First, please consult the HTP Warranty Wizard
(http://www.htproducts.com/Warranty-Wizard.html) to check
warranty eligibility. You may also contact HTP Technical Support
at 1-800-323-9651 for questions or assistance. Warranty coverage
requires review and approval of the issue with HTP Technical Support
or through the Warranty Wizard prior to a full unit replacement. Any
claim for warranty reimbursement will be rejected if prior approval
from HTP is not obtained in advance of a full unit replacement. Final
determination will be made as part of the warranty claim process.
When submitting a warranty claim the following items are
required:
1. Proof of purchase or installation of the product – Typically a
copy of the invoice from the installing contractor, the receipt of the
purchase of the product, or an original certicate of occupancy for
a new home.
2. Clear pictures (or video) of the following:
a. Serial number tag (sticker)
b. The product
c. The product issue / failure whenever possible
d. A picture of the piping near the product
e. For gas red products, a picture of the venting, including how
it exits the building
All claims will be reviewed by HTP within three (3) business days. If
additional information is required and requested by the HTP Claims
Department you will have thirty (30) days to provide it. When all
requested information is provided HTP will respond within three (3)
business days. The claim will be automatically closed if requested
information is not provided within thirty (30) days. Claims will not be
reopened without HTP Warranty Supervisor approval.
During the claims process a product that must be replaced will be
given a designation of either a) eld scrap, or b) return to HTP. If the
product must be returned to HTP, the returned product must arrive
at HTP within thirty (30) days of the date of our request to return the
product. After receipt of the returned product HTP may require as
many as thirty (30) additional days for product testing. NOTE: Any
components or heaters returned to HTP for warranty analysis
will become the property of HTP and will not be returned, even
if credit is denied.
If you have questions about the coverage of this warranty, please
contact HTP at the following address or phone number: HTP, 272
Duchaine Blvd., New Bedford, MA, 02745, Attention: Warranty Service
Department, 1(800) 323-9651.
SERVICE, LABOR AND SHIPPING COSTS
This limited warranty does not extend to any shipping charges,
delivery expenses, or administrative fees incurred by the Owner
in repairing or replacing the solar collector or component(s). This
warranty does not extend to any labor costs incurred by any person
as a result of the repair, replacement, removal, or reinstallation of a
solar collector or any component thereof. All such expenses are the
Owner’s responsibility.
LIMITATIONS OF YOUR HTP WARRANTY AND REMEDIES
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN
AND ACCEPTED TO THE FURTHEST EXTENT UNDER APPLICABLE
LAW IN LIEU OF ANY AND ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE AND ANY OBLIGATION, LIABILITY, RIGHT,
CLAIM OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT
ARISING FROM HTP’S NEGLIGENCE, ACTUAL OR IMPUTED. THE
REMEDIESOFTHEOWNERSHALLBELIMITEDTOTHOSEPROVIDED
HEREINTOTHE EXCLUSION OF ANY OTHER REMEDIES INCLUDING
WITHOUT LIMITATION, INCIDENTAL OR CONSEQUENTIAL
DAMAGES, SAID INCIDENTAL AND CONSEQUENTIAL DAMAGES
INCLUDING, BUT NOT LIMITED TO, PROPERTY DAMAGE, LOST
PROFIT OR DAMAGES ALLEGED TO HAVE BEEN CAUSED BY
ANY FAILURE OF HTP TO MEET ANY OBLIGATION UNDER THIS
AGREEMENT INCLUDING THE OBLIGATION TO REPAIR AND
REPLACE SET FORTH ABOVE. NO AGREEMENT VARYING OR
EXTENDING THE FOREGOING WARRANTIES, REMEDIES OR THIS
LIMITATION WILL BE BINDING UPON HTP. UNLESS IN WRITING
AND SIGNED BY A DULY AUTHORIZED OFFICER OF HTP. THE
WARRANTIES STATED HEREIN ARE NOT TRANSFERABLE AND
SHALL BE FOR THE BENEFIT OF THE OWNER ONLY.
NO OTHER WARRANTIES
This warranty gives you specic legal rights, and you may also have
other rights that vary from state to state. Some states do not allow
the exclusion or limitation of incidental or consequential damages so
this limitation or exclusion may not apply to you.
These are the only written warranties applicable to the solar
collector manufactured and sold by HTP. HTP neither assumes nor
authorizes anyone to assume for it any other obligation or liability
in connection with said solar collectors. HTP reserves the right to
change specications or discontinue models without notice.

lp-364 Rev. 000 Rel. 007 Date 2.12.18
20
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