This manual must only be used by
a qualified heating installer / service
technician. Read all instructions
before installing. Perform steps in
the order given. Failure to comply
could result in severe personal
injury, death, or substantial property
damage.
Winterizing the System ............................................... 23
To Drain/Flush the System ......................................... 23
7. PERFORMANCE DATA
Performance Data Charts ........................................... 24-27
REVISION NOTES ............................................ Back Cover
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels
or to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
2
Please read before proceeding
Installation & Operation Manual
WARNING
NOTICE
WARNING
Installer – Read all instructions before
installing. Perform steps in the order given.
Have this storage tank serviced/inspected
by a qualified service technician, at least
annually.
Failure to comply with the above could result
in severe personal injury, death or substantial
property damage.
When calling or writing about the appliance
– Please have the model and serial number
from the tank rating plate.
Consider piping and installation when
determining appliance location.
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by the
consignee.
Factory warranty (shipped with appliance)
does not apply to appliances improperly
installed or improperly operated.
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
This appliance MUST NOT be installed in
any location where gasoline or flammable
vapors are likely to be present.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call
the fire department.
• Installation and service must be performed by a
qualified installer, service agency, or the gas supplier.
WARNING
Failure to adhere to the guidelines on this
page can result in severe personal injury,
death, or substantial property damage.
When servicing the Strato-Therm+ –
• To avoid severe burns, allow the appliance to cool
before performing maintenance.
Appliance operation –
• Do not use this appliance if any part has been under
water. The possible damage to a flooded appliance can
be extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
The following chart details the relationship of water temperature
and time with regard to scald injury and may be used as a
guide in determining the safest water temperature for your
applications.
APPROXIMATE TIME / TEMPERATURE
RELATIONSHIPS IN SCALDS
120°FMore than 5 minutes
125°F1 1/2 to 2 minutes
130°FAbout 30 seconds
135°FAbout 10 seconds
140°FLess than 5 seconds
145°FLess than 3 seconds
150°FAbout 1 1/2 seconds
155°FAbout 1 second
Hot Water Can Scald!
• Water heated to temperatures for clothes washing, dish washing, and other sanitizing needs can
scald and cause permanent injury.
• Children, elderly, and infirm or physically handicapped persons are more likely to be
permanently injured by hot water. Never leave them unattended in a bathtub or shower.
Never allow small children to use a hot water tap or draw their own bath.
• If anyone using hot water in the building fits the above description, or if state laws or local
codes require certain water temperatures at hot water taps, you must take special
precautions:
• Use lowest possible temperature setting.
• Install some type of tempering device, such as an automatic mixing
valve, at hot water tap or water heater. Automatic mixing valve must be selected and
installed according to valve manufacturer’s recommendations and instructions.
• Water passing out of drain valves may be extremely hot. To avoid injury:
• Make sure all connections are tight.
• Direct water flow away from any person.
Protection Must Be Taken Against Excessive Temperature and Pressure!
--Installation of a Temperature & Pressure (T&P) relief valve is required.
3
Installation & Operation Manual
1 General information
The Lochinvar Strato-Therm+ solar stratified tank (FIG. 1-1, page 5) is designed to use a solar collector system, in conjunction
with a back-up heat source, to generate domestic hot water. This solar tank consists of a spherical heat exchanger attached to an
unlined tank containing a corrugated 316L stainless steel coil. Tank components and specifications are detailed in FIG.’s 1-1 and
1-2 (pages 5 and 6), as well as Tables 1A - 1D.
Solar heated water is pumped through the spherical heat exchanger to heat the water in the tank. A backup heat source is used to
maintain desired tank temperature in the event that solar heated water is not available. The tank may be used to heat domestic
potable water which runs through the stainless steel coil. In addition to generating domestic hot water, this tank can have many
other applications including indirect pool heating and space heating. Consult the factory if your specific application is not
covered in this manual. The tank is not intended for use in gravity water heating applications.
Operating Restrictions:
• Maximum domestic hot water temperature is 194°F.
• Maximum boiler water temperature is 210°F.
• Maximum working pressure for the vessel is 125 psig.
Tank shipment
Tanks taller than 7.5 feet will be shipped horizontally. Four
shipping legs are used to secure the tank to a pallet, and holes
are provided in the top cover for access to lifting lugs. The
shipping legs should be removed when the tank is removed
from the shipping crate.
Use field-supplied insulation to pack the shipping and lug
compartments, then use the factory provided covers to
conceal compartments upon final installation.
Table 1A
Strato-Therm+
Tank Component Materials
ComponentMaterial
TankSteel SA414-G
Coil316L Stainless Steel
Insulation Polyurethane Foam
JacketPre-paint Sheet Metal
Table 1B
Spherical Heat Exchanger
Component Materials
ComponentMaterial
HousingSteel S 235 JR
Heat Exchanger CoilCopper
InsulationPolyurethane Foam
JacketPolypropylene
4
1 General information (continued)
Figure 1-1 Strato-Therm+ solar stratified tank components
The Strato-Therm+ uses a copper finned tube spherical heat
exchanger to provide optimum solar stratified charging.
The spherical exchanger helps maintain optimal use of solar
energy for hot water and space heating. The multi-functional
design improves efficiency in every system. Insulated with
polyurethane foam, the spherical heat exchanger and tank
maintain a space-saving design with minimal heat loss. Refer
to FIG. 1-3 and Tables 1E and 1F for additional spherical heat
exchanger information and measurements.
Figure 1-3 Spherical heat exchanger w/ tank
B
Table 1E
Tank with Spherical Measurements
Model
STU150SHX4000044 1/228
STU200SHX4000048 1/432
STU257SHX4000150 1/434
STU350SHX4000156 1/440
STU423SHX4000256 1/440
STU504SHX4000262 1/446
STU650SHX4000371 1/452
STU752SHX4000371 1/452
STU940SHX4000471 1/452
Spherical
Model
A
(in.)
(in.)
B
A
IMG00054
Table 1F
Spherical Heat Exchanger Specifications
Tank
Model
SHX400008 1/214610.75"280.557.98.45
SHX400018 1/214610.75"420.657.88.45
SHX400028 1/214611"591.17.358.45
SHX4000311 3/417611.25"1022.015.817.8
SHX4000411 3/417801.25"1022.015.817.8
Diameter
(in)
Jacket
Diameter
(in)
Jacket
Height
(in)
Solar
Inlet
Return
(NPT)
HEX
Surface
Area
(ft2)
HEX
Water
Volume
(gal)
Tank
Water
Volume
(gal)
Total
Water
Volume
(gal)
7
2 Pre-installation
Installation & Operation Manual
1. The installation must conform to the instructions in this
manual and all applicable local, state, provincial, and
national codes, laws, regulations, and ordinances.
Installations in Canada must conform to B149.2 Installation
Code.
2. Ensure that the domestic water supply to the stainless
steel coil has physical and chemical characteristics that fall
within the limits shown in Table 2A. Where questions exist
as to the composition of the water on the job site, a qualified
water treatment expert should be consulted.
CAUTION
3. Read and understand all installation requirements in
this manual.
Water with characteristics outside the limits
shown in Table 2A may severely shorten
the life of the domestic water coil due to
corrosion. Damage in such cases is not
covered under warranty.
Table 2A
Water Chemistry Requirements
Domestic potable water must have characteristics falling
within the following limits:
CharacteristicMin.Max.
pH6.59.5
Chloride (PPM)--200
Locating the Tank
1. Choose a location for the Strato-Therm+ centralized to
the piping system. You must also locate the Strato-Therm+
where it will not be exposed to freezing temperatures.
Additionally, you will need to place the appliance so that
the controls, drain, and inlet/outlets are easily accessible.
This appliance must not be installed outdoors, as it is
certified as an indoor appliance, and must also be kept
vertical on a level surface.
2. Table 1C on page 5 shows the weight of all the tanks filled
with water. Ensure that the location chosen for the tank
is capable of supporting the weight.
CAUTION
3. The tank may be located some distance from the heat
source provided that the pump is designed to to provide
enough flow for both units to perform properly. The
further the distance from the tank to the heat source, the
longer the response time will be to provide sufficient heat
to the tank. Insulate piping between the heat source and
the tank.
This appliance must be placed where
leakage from the relief valve, leakage from
the related piping, or leakage from the
tank or connections, will not result in
damage to the surrounding areas, or to
the lower floors of the building. A water
heater should always be located in an area
with a floor drain or installed in a drain
pan suitable for water heaters. Lochinvar
shall not be held liable for any such water
damage.
WARNING
Failure to properly support the tank could
result in property damage or personal
injury.
Recommended Clearances
The installation location must provide adequate clearances
for servicing and proper operation of the appliance.
A 12-inch vertical clearance is recommended from the top of
the appliance. A zero clearance is allowed for the sides of the
appliance. However, boiler and servicing clearances must be
figured when locating the appliance.
8
0
5
10
15
20
25
30
02468101214
Pressure Drop, psi
Flow Rate, gpm
STU150
STU200 /
SHX40000
STU257
STU350 /
SHX40001
STU423
STU504 /
SHX40002
STU650
STU752 /
SHX40003
STU940 /
SHX40004
Installation & Operation Manual
3 Solar connections
A solar thermal system consists of several components selected to work together to convert solar energy into hot water for various
applications. A controller is used to turn on a pump when the fluid in the solar collectors is warmer than the water in the StratoTherm+ tank. The pump will transport hot fluid from the collector to the heat exchanger and replace it with cooler fluid returning.
The collectors, pump station and heat exchanger are connected with supply and return piping that is insulated to minimize heat
losses (FIG. 3-1, page 10). The system is equipped with over-temperature and over-pressure devices that prevent unsafe operating
conditions. When multiple heat exchangers are used, they should connected in reverse-return arrangement (FIG. 3-2, page 10). This
will help ensure that solar heated water is distributed evenly between the heat exchangers. Pressure drop and maximum operating
values for the Strato-Therm+ spherical heat exchanger are listed in Tables 3A - 3C.
Installation and commissioning must be carried out by a licensed contractor. Take appropriate safety measures when carrying
out any installation work on the roof and observe all relevant accident prevention regulations. It is the installer’s responsibility to
comply with the building and installation codes in effect and all regulations that apply to the operation of a solar hot water system.
MODEL
STU150
STU200
STU257
STU350
STU423
STU504
STU650
STU752
STU940
Table 3A
Spherical Heat Exchanger
Pressure Drop Values
PRESSURE DROP PSI)
SPHERICAL
MODEL
SHX400000.200.682.294.667.71 11.39 15.67 20.52
SHX400010.240.812.715.529.13 13.49 18.56 24.31
SHX400020.070.230.781.592.643.90 5.367.02
SHX400030.030.090.300.611.011.50 2.062.70
SHX400040.030.090.300.611.011.50 2.062.70
1
GPM2 GPM4GPM6GPM8GPM10GPM12GPM14GPM
Table 3C
Spherical Heat Exchanger Pressure Drop Chart
Table 3B
Spherical Maximum Operating
Conditions
Copper Heat
Exchanger
Temperature230°F230°F
Pressure145 psi125 psi
Tank
9
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