Page 1
Installation & Operation
Manual
Models: SDT/SET065 - 119
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.
WARNING
Save this manual for future reference.
SDT-SET-I-O Rev B
SDT
Solar Dual Coil Tank
SET
Solar Electric Tank
Page 2
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.
2
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.
HAZARD DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PLEASE READ BEFORE PROCEEDING . . . . . . . . . . . . 3
1. GENERAL INFORMATION
Operating Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Single-Wall Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . 4
2. PRE-INSTALLATION
Locating the Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recommended Clearances . . . . . . . . . . . . . . . . . . . . . . . . 5
3. BOILER SIDE PIPING (SDT MODELS)
Zone with Circulator to Aquastat . . . . . . . . . . . . . . . . . . . . 6
Zone with Valve to Aquastat . . . . . . . . . . . . . . . . . . . . . . . 6
DHW Prioritization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Multiple Tank Connections (Boiler Side) . . . . . . . . . . . . . . 6
Table 3A - 3B - Pressure Drop Charts . . . . . . . . . . . . . 7
Table 3C - Pressure Drop Values . . . . . . . . . . . . . . . . . 7
Piping Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11
4. DOMESTIC SIDE (TANK) PIPING
Basic Domestic Piping . . . . . . . . . . . . . . . . . . . . . . . . . 11
Multiple Tank Domestic Water Piping . . . . . . . . . . . . . 11
Domestic Water Piping for Distant Fixtures . . . . . . . . .11
Anti-scald Valves (Mixing Valves) . . . . . . . . . . . . . . . . 12
Install Drain Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Temperature and Pressure (T&P) Relief Valve . . . . . 12
Table 4A - Minimum Relief Valve (AGA Rating) . . 13
5. WIRING
Electrical Connection and Thermostat Setup . . . . . . . . . .16
Indirect Water Heater Sensor Setup (Knight Boiler) . . . . 18
Install Tank Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Indirect Water Heater Controlled Using Aquastat and Zone
Circulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6. START-UP AND CHECK-OUT . . . . . . . . . . . . . . . . . 20
7. MAINTENANCE
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . 21
To Fill the Water Heater . . . . . . . . . . . . . . . . . . . . . . . 21
To Drain the Water Heater . . . . . . . . . . . . . . . . . . . . . 21
8. PERFORMANCE DATA
Performance Data Charts . . . . . . . . . . . . . . . . . . . . . . . . 22-24
9. High Output Piping
High Domestic Hot Water Usage . . . . . . . . . . . . . . . . 25
Series Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-26
Parallel Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25-27
REVISION NOTES . . . . . . . . . . . . . . . . . . . . . Back Cover
Contents
Page 3
SDT/SET Installation & Operation Manual
Please read before proceeding
Installer – Read all instructions before
installing. Perform steps in the order given.
Have this indirect water heater
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.
Failure to adhere to the guidelines on this
page can result in severe personal injury,
death, or substantial property damage.
When servicing the indirect water heater –
• To avoid severe burns, allow the appliance to cool
before performing maintenance.
Indirect water heater operation –
• Should overheating occur or gas supply fail to shut off,
do not turn off or disconnect electrical supply to
circulator. Instead, shut off the gas supply at a location
external to the appliance.
• 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.
When calling or writing about the appliance
– Please have the indirect water heater model
and serial number from the indirect water
heater 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
NOTICE
WARNING
WARNING
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
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°F More than 5 minutes
125°F 1 1/2 to 2 minutes
130°F About 30 seconds
135°F About 10 seconds
140°F Less than 5 seconds
145°F Less than 3 seconds
150°F About 1 1/2 seconds
155°F About 1 second
Page 4
1 General Information
The Lochinvar SDT/SET series indirect water heater
(FIG. 1-1) is designed to generate domestic hot water in
conjunction with a solar panel using forced circulation with a
backup heat source. This indirect water heater consists of a
316L Stainless Steel tank in which a smooth 304L stainless
steel coil is located (Table 1A). Solar heating fluid is pumped
through the coil and heats the water in the tank. If the solar
panel cannot produce enough heat, the backup source should
supply hot water. This tank is not intended for use in pool
heating applications or for heating any fluid other than water.
It is also not intended for use in gravity hot water heating
systems.
Table 1A
Component Materials
Component Material
Ta n k 316L Steel Stainless Steel
Coil 304L Stainless Steel
Insulation Polyurethane
Jacket ABS
Figure 1-1 Lochinvar SDT and SET Series Indirect Water Heaters
Single-Wall Heat Exchanger
National Standard Plumbing Code
Single-wall heat exchangers in water heaters comply with the
National Standard Plumbing Code provided that:
• boiler water (including additives) is practically non-toxic,
having a toxicity rating or class of 1, as listed in Clinical
Toxicology of Commercial Products, and
• boiler water pressure is limited to a maximum of 30 psig by
approved relief valve.
Uniform Plumbing Code
Single-wall heat exchangers are permitted if they satisfy all of
the following requirements --
1. The heat transfer medium is potable water or contains only
substances which are recognized as safe by the U.S. Food
and Drug Administration.
2. The pressure of the heat transfer medium is maintained less
than the normal minimum operating pressure of the
potable water system.
3. The equipment is permanently labeled to indicate that
only additives recognized as safe by the FDA shall be used
in the heat transfer medium.
Other heat exchanger designs may be permitted where
approved by the Administrative Authority.
Operating Restrictions:
• Maximum domestic hot water temperature is 194°F.
• Maximum boiler water temperature is 210°F.
• Maximum working pressure for the vessel tank is
150 psig.
SDT/SET Installation & Operation Manual
4
“G”
“F”
SOLAR DUAL
COIL
“E”
“D”
“C”
1. RELIEF VALVE CONNECTION
2. HOT WATER OUTLET
3. BOILER WATER IN
4. BOILER WATER OUT
5. DRAIN / COLD WATER INLET
6. SOLAR WATER IN
7. SOLAR WATER OUT
8. ELEMENT
o
o
22.5
45
“B”
“A”
“I”
1 - 1/2” FPT
3/4” FPT
AQUASTAT WELL
1” MPT
SOLAR SENSOR
1” MPT
1 - 1/2” MPT
PAR T N O.
SDT065
SDT080
SDT119
SET065
SET090
SET119
1” MPT
1” MPT
“A”
(in.)
3 5/16
3 5/16
3 5/16
3 5/16
3 5/16
3 5/16
SOLAR ELECTRIC
2
1
3
8
6
“G”
7
5
“B”
(in.)
9 1/8
9 1/8
9 3/8
9 1/8
9 1/8
9 3/8
“F”
“C”
(in.)
27 15/16
27 15/16
31 11/16
27 15/16
27 15/16
31 11/16
“H”
WEIGHT
45
“H”
(in.)
N/A
N/A
N/A
59 7/8
59 7/8
59 7/8
o
“I”
FULL OF WATER
(in.)
24
24
28
24
24
28
“I”
1 - 1/2” FPT
3/4” FPT
1” MPSF
1” MPT
SOLAR SENSOR
1” MPT
1 - 1/2” MPT
(LBS)
820
921
1268
820
921
1268
2
1
8
6
7
5
“E”
“D”
(in.)
(in.)
33 5/8
47 3/16
53 3/4
40 3/16
54 1/2
37 7/16
N/A
N/A
N/A
N/A
N/A
N/A
“C”
“B”
“A”
“F”
(in.)
52 5/16
61 13/16
60 1/8
52 5/16
61 13/16
60 1/8
“G”
(in.)
59 7/8
69 3/8
68 3/16
59 7/8
69 3/8
68 3/16
22.5
o
Page 5
5
2 Pre-installation
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. Be certain the domestic water supply to the tank 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, a
qualified water treatment expert should be consulted.
Water with characteristics outside the
limits shown in Table 2A may severely
shorten the life of the tank due to
corrosion. Damage to tanks in such
cases is not covered under warranty.
3. Read and understand all installation requirements in
this manual.
Table 2A
Water Chemistry Requirements
Water used in the tank must have characteristics falling
within the following limits:
Characteristic Min. Max.
Ph 6.0 8.0
Chloride (PPM) -- 80
CAUTION
Locating the Tank
1. Choose a location for your water heater centralized to the
piping system. You must also locate the SDT/SET water
heater where it will not be exposed to freezing temperatures.
Additionally, you will need to place the water heater 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. Keep distance between boiler and water heater to a
minimum to:
a. reduce piping heat loss
b. provide minimal friction loss
3. Figure 1-1 on page 4 shows the weights of all the tanks filled
with water. Make sure that the location chosen for the tank
is capable of supporting it.
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.
CAUTION
Failure to properly support the tank could
result in property damage or personal injury.
WARNING
4. The tank may be located some distance from the boiler
provided the pump is designed to provide the flow called
for in Table 3B (page 7)- Pressure Drop Values, through the
coil. The further the tank is from the boiler, the longer the
response of the boiler will be to a call from the tank zone.
Insulate piping between the boiler and the tank.
Recommended Clearances
The installation location must provide adequate clearances for
servicing and proper operation of the water heater. A 12 inch
vertical clearance is recommended from the top of the water
heater. A zero clearance is allowed for the sides of the water
heater. However, boiler, electrical, and servicing clearances
must be figured when locating the water heater.
Minimum Clearance to the Element Cover
See FIG 2-1. Clearances must be a minimum of 24-inches to
allow for element removal and replacement on SET model.
SDT/SET Installation & Operation Manual
Figure 2-1 Element Cover Clearances
24” MIN CLEARANCE FROM
ELEMENT COVER
(SET Models)
Page 6
6
Multiple Tank Connections (Boiler Side)
Multiple tank installations must be done in the “reverse-return”
manner. The reason for this is to create the same pressure drop
(and therefore, the same flow) through the coil of each tank.
The boiler manifold piping must be sized so that each coil has
the flow rate called for in Table 3B.
Because the pressure drop through tank coils varies from size to
size, it is hard to predict the flow rate that will be developed
through each coil when two tanks of different sizes are placed in
the same manifold. For this reason it is best not to mix tanks of
different sizes in the same zone if their recovery is critical.
3 Boiler Side Piping (SDT models)
Figures 3-1 thru 3-4 show typical boiler side piping for
several common situations. Regardless of which system is
used it is imperative that the flow rates called for in Table 3C
are developed through the coil. This requires properly sized
piping and a properly sized pump.
The system shown in FIG’s 3-1 thru 3-4 are described
below:
Zone with Circulator to Aquastat
This system is like the circulator zone system on a straight
heat job except that one of the zones goes to the tank
instead of radiation. As on any circulator zone system
check valves should be installed in each zone to prevent
unwanted circulation through zones which are not calling
for heat. Figure 3-1 on page 8 illustrates typical circulator
zone piping.
Zone with Valve to Aquastat
As with the circulator zone system, this system is just like a
standard heating zone system except that one of the zones
is connected to the tank coil as shown in FIG. 3-2 on page
9. The system circulator must be large enough to move
boiler water through the coil regardless of the flow rate
required through the heating zones.
DHW Prioritization
This piping system is designed to provide direct hot water
priority over the other zones in the heating system. When
there is a Domestic Hot Water (DHW) call for heat, the
Knight control will shut off the boiler circulator and
activate the domestic hot water circulator. Once the DHW
demand is satisfied, the boiler circulator will be readjusted
as demand requires. The circulator must be large enough to
move the boiler water through the coil in the tank, and it
must meet the minimum boiler flow requirments. The
recommended piping for a DHW priority system is
depicted in FIG. 3-3 on page 10.
SDT/SET Installation & Operation Manual
Page 7
7
SDT/SET Installation & Operation Manual
Table 3A
Pressure Drop Chart SDT/SET065-080
Table 3C
Pressure Drop Values
MODEL
COIL
CONN.
(IN)
COIL
LENGTH
(FT)
SQ FT
SURFACE
AREA
PRESSURE DROP
SOLAR COIL
(FT / HD)
COIL
LENGTH
(FT)
SQ FT
SURFACE
AREA
PRESSURE DROP
BOILER COIL
(FT / HD)
5
GPM8 GPM
12
GPM16GPM20GPM
5
GPM8 GPM
12
GPM16GPM20GPM
SDT065
1 41.5 13.5 0.61 1.57 3.53 6.27 9.8 28 9.2 0.4 1.03 2.31 4.1 6.41
SDT080
1 41.5 13.5 0.61 1.57 3.53 6.27 9.8 28 9.2 0.4 1.03 2.31 4.1 6.41
SDT119
1 67.3 22.0 .73 1.87 4.22 7.5 11.71 48.5 16 0.61 1.57 3.53 6.27 9.8
SET065
1 41.5 13.5 0.61 1.57 3.53 6.27 9.8
SET080
1 41.5 13.5 0.61 1.57 3.53 6.27 9.8
SET119
1 67.3 22.0 .73 1.87 4.22 7.5 11.71
3 Boiler Side Piping (SDT models) (continued)
Table 3A Pressure Drop Chart SDT/SET065-080
Table 3C Pressure Drop Values SDT/SET065-119
Table 3B
Pressure Drop Chart SDT/SET119
Table 3B Pressure Drop Chart SDT/SET119
SDT / SET065 - 080 FRICTION LOSS
10.00
10.00
8.00
8.00
6.00
6.00
HDFT/
FT/HD
4.00
4.00
2.00
2.00
0.00
0.00
SDT / SET065 - 080 FRICTION LOSS
5 8 12 16 20
GPM
SOLAR
SOLAR
COIL
BOILER
BOILER
SDT
/
COIL
COIL
COIL
FT/HD
12.00
10.00
8.00
6.00
4.00
2.00
0
5 8 12 16 20
GPM
SET119 FRICTION
LOSS
SOLAR
COIL
BOILER
COIL
Page 8
SDT/SET Installation & Operation Manual
8
Figure 3-1 Piping Diagram Zoned with Circulators
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
3 Boiler Side Piping (SDT models)
NOTICE
Please note that the installer is responsible for ensuring DHW prioritization when piped as a zone.
ZONE #1
MAKE UP
WATER
DRAIN POINT
(TYPICAL)
BALL VALVE
(TYPICAL)
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
AIR SEPARATOR
EXPANSION
TANK
UNION
(TYPICAL)
TEMPERATURE /
PRESSURE
GAUGE
DRAIN
PRESSURE
RELIEF VALVE
GAS SUPPLY
PRESSURE
GAUGE
SYSTEM SUPPLY
SENSOR
(WHEN USED)
NOT TO EXCEED 4 PIPE DIA.
OR A MAXIMUM OF 12" APART
Y-STRAINER
FLOW CHECK
BOILER
CIRCULATOR
VALVE
BOILER BACKUP
HEAT EXCHANGER
( SDT MODELS ONLY )
SOLUTION
BOILER
SOLAR
HEAT EXCHANGER
ZONE#2ZONE
#3
HOT
WATER
OUT
SQUIRE
ZONE
#4
ZONE CIRCULATORS
(TYPICAL)
ANTI-SCALD
MIXING VALVE
COLD
WATER
IN
TEMPERATURE/
PRESSURE
RELIEF VALVE
BOILER
TANK SENSOR /
AQUASTAT
SOLAR SENSOR
CHECK VALVE
TEMPERATURE/
PRESSURE GAUGE
(TYPICAL)
RECIRCULATION
CHECK VALVE
DRAIN
( FIELD SUPPLY )
AUXILIARY CATCH PAN
FROM
SOLAR
TO
SOLAR
PUMP
Page 9
Installation & Operation Manual
9
Figure 3-2 Piping Diagram Zoned with Valves
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
3 Boiler Side Piping (SDT models) (continued)
NOTICE
Please note that the installer is responsible for ensuring DHW prioritization when piped as a zone.
ZONE #1
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP
WATER
DRAIN POINT
(TYPICAL)
BALL VALVE
(TYPICAL)
PRESSURE
SYSTEM SUPPLY
AIR SEPARATOR
EXPANSION
(TYPICAL)
TEMPERATURE /
PRESSURE
GAUGE
SENSOR
(WHEN USED)
TANK
UNION
DRAIN
PRESSURE
RELIEF VALVE
GAS SUPPLY
PRESSURE
GAUGE
SYSTEM
CIRCULATOR
NOT TO EXCEED 4 PIPE DIA.
OR A MAXIMUM OF 12" APART
Y-STRAINER
BOILER
CIRCULATOR
BOILER BACKUP
HEAT EXCHANGER
( SDT MODELS ONLY )
SOLUTION
BOILER
SOLAR HEAT
EXCHANGER
ZONE
#2
SQUIRE
ZONE
#3
HOT
WATER
OUT
ZONE
#4
ZONE VALVES
(TYPICAL)
DIFFERENTIAL
PRESSURE
VALVE (IF USED)
ANTI-SCALD
MIXING VALVE
COLD
WATER
IN
TEMPERATURE/
PRESSURE
RELIEF VALVE
BOILER
TANK SENSOR /
AQUASTAT
SOLAR SENSOR
CHECK VALVE
TEMPERATURE/
PRESSURE GAUGE
(TYPICAL)
RECIRCULATION
CHECK VALVE
DRAIN
( FIELD SUPPLY )
AUXILIARY CATCH PAN
BYPASS
FROM
SOLAR
TO
SOLAR
PUMP
Page 10
SDT/SET Installation & Operation Manual
10
Figure 3-3 Knight Boiler Primary / Secondary Piping
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
3 Boiler Side Piping (SDT models)
TO
SYSTEM
BALL VALVE
(TYPICAL)
BACKFLOW
PREVENTER
MAKE UP WATER
SEPARATOR
CIRCULATOR
EXPANSION
PRESSURE
REDUCING VALVE
SYSTEM SUPPLY
SENSOR
AIR
SYSTEM
TAN K
PRESSURE
GAUGE
DRAIN POINT
(TYPICAL)
NOT TO EXCEED 4 PIPE DIA. OR
A MAXIMUM OF 12" APART
Y-STRAINER
(RECOMMENDED)
BOILER
CIRCULATOR
DOMESTIC
HOT WATER
CIRCULATOR
BOILER BACKUP
HEAT EXCHANGER
(SDT MODELS ONLY)
FROM
SYSTEM
ANTI-SCALD
MIXING VALVE
HOT
WATE R
OUT
COLD
WATE R
IN
TEMPERATURE/
PRESSURE RELIEF VALVE
BOILER
TANK SENSOR /
AQUASTAT
SOLAR SENSOR
CHECK VALVE
TEMPERATURE/
PRESSURE GAUGE
(TYPICAL)
FROM SOLAR
UNION
(TYPICAL)
TEMPERATURE /
PRESSURE
GAUGE
DRAIN
PRESSURE
RELIEF VALVE
KNIGHT
BOILER
SOLAR
HEAT EXCHANGER
SQUIRE
CHECK VALVE
DRAIN
(FIELD SUPPLY)
TO SOLAR
RECIRCULATION
PUMP
Page 11
SDT/SET Installation & Operation Manual
11
Figure 3-4 Multiple Tank Connections
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
3 Boiler Side Piping (SDT models) (continued)
PRESSURE
REDUCING VALVE
BACKFLOW
PREVENTER
MAKE UP
WATER
TO
SYSTEM
BALL VALVE
(TYPICAL)
AIR SEPARATOR
SYSTEM
SUPPLY SENSOR
SYSTEM
CIRCULATOR
SYSTEN
CIRCULATOR
EXPANSION
TAN K
PRESSURE
GAUGE
DRAIN POINT
(TYPICAL)
UNION
(TYPICAL)
TEMPERATURE/
PRESSURE GAUGE
NOT TO EXCEED 4 PIPE DIA. OR
A MAXIMUM OF 12” APART
Y-STRAINER
(RECOMMENDED)
BOILER
CIRCULATOR
DRAIN
PRESSURE
RELIEF VALVE
DOMESTIC
HOT WATER
CIRCULATOR
KNIGHT
BOILER
FROM SYSTEM
SOLAR
HEAT
EXCHANGER
(TYPICAL)
SQUIRE
HOT
WATER
OUT
SQUIRE
ANTI-SCALD
MIXING VALVE
TEMPERATURE/
PRESSURE
RELIEF VALVE
BOILER
TANK SENSOR/
AQUASTAT
SOLAR SENSOR
COLD WATER IN
CHECK VALVE
TEMPERATURE/
PRESSURE GAUGE
(TYPICAL)
RECIRCULATION
PUMP
CHECK VALVE
(TYPICAL)
DRAIN
(FILED SUPPLIED)
FROM
SOLAR
TO
SOLAR
Page 12
SDT/SET Installation & Operation Manual
12
4 Domestic Side (Tank) Piping
Basic Domestic Piping
Figure 4-2 on page 15 shows typical domestic water piping
for a tank. The function of the components shown are as
follows:
a. Shut-off valves (recommended) - Used to isolate the
tank for servicing.
b. Backflow Preventer (required by some codes) - Used to
prevent water from backing out of the tank and into
the main potable water supply in the event that inlet
water pressure drops.
c. Expansion Tank (required for thermal expansion)- his
expansion tank absorbs the increased volume caused
by heating water.
Use an expansion tank designed for use on domestic
water systems. Refer to the expansion tank
manufacturer’s literature for the proper size expansion
tank to use.
NOTICE
When an expansion tank is used, do not
put any valves between the expansion
tank and tank inlet.
d. Unions (recommended) - Used to disconnect the tank
in the unlikely event that this is necessary.
e. Drain (required) - Used to drain the tank for
inspection or servicing.
Multiple Tank Domestic Water Piping
The two pipe reverse return piping uses more pipe than the
two pipe direct return piping, but the flow is more balanced
and even in the two pipe reverse return piping layout (see
FIG. 3-4).
Each tank must have its own T&P valve. It is recommended
that each tank be equipped with its own isolation valves,
unions, and drains so that one tank may be removed from
the system. If local codes require a backflow preventer,
check with the appropriate authority to find out whether
one backflow preventer may be used for tanks or each tank
must be equipped with its own backflow preventer. If each
tank must have its own backflow preventer, each tank must
also have its own expansion tank. If a common backflow
preventer is permitted, an expansion tank must be sized to
accommodate the expansion volume of all tanks.
Domestic Water Piping for Distant Fixtures
In some cases the furthest fixture may be quite distant from
the tank. Such an installation would result in an
unacceptable delay before hot water reaches these distant
fixtures. Even if all the fixtures are relatively close to the
tank, the building owner may want hot water at all fixtures
as soon as they are opened.
To prevent delays, return circulation piping with a check
valve that allows flow to the inlet of the tank. This should be
installed on each branch circuit at the farthest fixture or
device, so that hot water is supplied upon demand.
Because hot water is always circulating in the hot water
branch, the entire branch should be insulated to prevent
excessive heat loss.
Page 13
SDT/SET Installation & Operation Manual
13
4 Domestic Side (Tank) Piping (continued)
Temperature & Pressure (T&P) Relief Valve
For protection against excessive
temperatures and pressure, install
temperature and pressure protective
equipment required by local codes, but not
less than a combination temperature and
pressure relief valve certified by a nationally
recognized testing laboratory that maintains
periodic inspection of production of listed
equipment or materials as meeting the
requirements for Relief Valves and
Automatic Gas Shutoff Devices for Hot
Water Supply Systems, ANSI Z21.22 and the
Standard CAN1-4.4, Temperature, Pressure,
Temperature and Pressure Relief Valves and
Vacuum Relief Valves. The combination
temperature and pressure relief valve shall
be marked with a maximum set pressure not
to exceed the maximum working pressure of
the water heater. The combination
temperature and pressure relief valve shall
also have an hourly rated temperature steam
BTU discharge capacity not less than shown
in Table 4A, page 14.
Install the combination temperature and
pressure relief valve into the opening
provided and marked for this purpose on
the water heater.
WARNING
Anti-scald Valves (Mixing Valves)
Anti-scald valves used with water heaters are also called
tempering valves or mixing valves. An anti-scald valve
mixes cold water in with the outgoing hot water to assure
that hot water reaching a building fixture is at a
temperature low enough to be safe. ASSE1017 and
ASSE1070 certified valves are recommended.
Usually, the maximum temperature of the outlet water will
stay near the setting of the tank control. In some cases,
however, hot water usage patterns can cause the outlet water
temperature to rise significantly above the control setting.
The temperature of water going to the fixtures may be more
carefully controlled through the use of a thermostatic
mixing valve. This device blends a controlled amount of
cold water with the hot water leaving the tank so that water
at a more constant temperature exits the mixing valve.
Anti-scald mixing valve piping is illustrated in FIG.’s 3-1
thru 3-4.
Install Drain Valve
Drain valve and fittings are supplied by others.
Standard Installation
• Install a tee connection at the domestic cold water
inlet (FIG. 4-1).
DRAIN
VALV E
Figure 4-1 Drain Valve Installed
WARNING
An anti-scald mixing valve does not
eliminate the risk of scalding.
* Set the tank thermostat as low as
practical.
* Feel water before bathing or
showering.
* If anti-scald or anti-chill protection
is required, use devices specifically
designed for such service. Install
these devices in accordance with
their manufacturer’s instructions.
Page 14
SDT/SET Installation & Operation Manual
14
NOTICE
Verify that the combination
temperature and pressure relief valve
complies with local codes. If the
combination temperature and pressure
relief valve does not comply with local
codes, replace it with one that does.
Follow the installation instructions in
this section.
NOTICE
The Lochinvar SDT/SET series water
heaters will absorb/store less than 200,000
Btu/hr when domestic water outlet
temperature is 210°F and boiler water
supply temperature is 240°F. Listed
outputs are based on ASME Section VIII
Interpretation VIII-1-86-136. Check
with local codes for applicability.
Standard Installation
• Install the T&P relief valve in the connection marked
“Relief Valve”.
T&P Relief Valve Discharge Piping
T&P relief valve discharge piping must be:
- made of material serviceable for a temperature of
250°F or greater.
- directed so that hot water flows away from all persons.
- directed to a suitable place for disposal.
- installed so as to allow complete draining of the T&P
relief valve and discharge line.
- terminated within 6" of the floor.
T&P relief valve discharge piping must not
be:
- excessively long. Using more than two (2) elbows or
15 feet of piping can reduce discharge capacity.
- directly connected to a drain. Refer to local codes.
- subject to freezing.
WARNING
Do not install any valve between the T&P
relief valve and the tank connection or on
the T&P relief valve discharge piping.
Improper placement and piping of T&P
relief valve can cause severe personal injury,
death or substantial property damage.
CAUTION
The T&P relief valve is not intended for
constant duty, such as relief of pressure due
to repeated normal system expansion.
Correct this condition by installing a
properly sized expansion tank in a domestic
water system. Refer to the expansion tank
manufacturer’s installation instructions for
proper sizing.
Do not place a valve between the combination temperature
and pressure relief valve and the tank.
WARNING
Failure to install and maintain a new, listed
3/4" X 3/4" temperature and pressure relief
valve will release the manufacturer from any
claim which might result from excessive
temperature and pressures.
Determine T&P relief valve size by the following
specifications, unless they conflict with local codes:
- SDT/SET065/080/119 - 3/4" NPT with a
minimum CSA Rating of 200,000 Btu/hr.
Table 4A
Minimum Relief Valve (CSA Rating)
Model BTU/hr
SDT/SET065 200,000
SDT/SET080 200,000
SDT/SET119 200,000
4 Domestic Side (Tank) Piping
Page 15
SDT/SET Installation & Operation Manual
15
EXPANSION
TANK
UNION
(TYPICAL)
SHOCK ARRESTOR
SHUTOFF VALVE
SHUTOFF
VALVE
BACKFLOW
PREVENTOR
SHUTOFF
VALVE
SHUTOFF
VALVE
ANTI-SCALD
MIXING VALVE
DRAIN
( FIELD SUPPLY)
RECIRCULATION
PUMP
TO BOILER
FROM BOILER
CHECK VALVE
BOILER
TANK SENSOR/
AQUASTAT
SQUIRE
TEMPERATURE /
PRESSURE
GAUGE
(TYPICAL)
CHECK VALVE
DRAIN
FROM SOLAR
TO SOLAR
SOLAR SENSOR
SOLAR
HEAT EXCHANGER
BOILER BACKUP
HEAT EXCHANGER
( SDT MODELS ONLY )
(SDT MODELS ONLY)
NOTE: UPPER COIL
REPLACED WITH ELEMENT
ON SET MODELS
Figure 4-2 Recommended Domestic Water Piping SDT/SET models
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
4 Domestic Side (Tank) Piping (continued)
Page 16
SDT/SET Installation & Operation Manual
T
16
5 Wiring
Electrical Connection
(Squire solar water heater with electric back up only -- SET models only)
Be sure to ground the water heater. The preferred way to ground is to use rigid metal conduit between the main
panel and the water heater junction box with approved end fittings. The separate ground wire connection
provided in the water heater junction box must also be grounded. Replace the junction box cover and insulation
after you have made all wiring connections.
CAUTION
The manufacturer’s warranty does not cover
any damage or defect caused by the
installation, attachment or use of any type of
unapproved devices into, onto or in
conjunction with this water heater. The use of
unauthorized energy saving devices may
shorten the life of the water heater and may
endanger life and property. The manufacturer
disclaims any responsibility for such loss or
injury resulting from
the use of such
unauthorized devices.
WARNING
Tank must be full before unit is turned on! The heating element will be damaged if energized for even a short
period of time while tank is dry!
CAUTION
After the water and electrical connection have been made and
the tank has been filled with water, turn on the power to
heater. The heater is now operational.
Thermostat Adjustment
The thermostat is located in the front of the heater. The access
cover must be removed to adjust to the factory default setting
of
120°F. This temperature is satisfactory for the averag
e
household use.
1. Turn off power to the heater.
2. Remove access cover and insulation. Do not remove the
thermostat protective cover.
3. Set temperature indicator to desired temperature, then
replace insulation and access cover.
4. Turn on power to heater
.
Combination “Thermostat and High Limit
Control (ECO)”
This heater is equipped with a combination thermostat and
high limit safety. If for any reason the water temperature
becomes eccessively high, the “High Limit Control (ECO”
breaks the circuit to the heating element. Once the switch
opens, it must be reset manually.
Figure 5-1 Thermostat
The 4500-watt heating element in the Squire SET is wired to the
junction box on top of the heater and it requires 240-volt/ A.C.
electrical service. The voltage requirement and wattage load
for
the heater is also specified on the heater identification
plate. A
1/2” E.M.T. opening, located on top of the unit is
provided for a
field wiring connection. Consult an
electrician to determine if
your electrical service is
adequate for the additional load of the
heater. The electrical
installation should be done by a qualified
licensed
electrician. All wiring must conform to the National
Electric Code and local codes.
NOTICE
The cause of the over temperature
condition must be corrected first.
. To reset, press the red button as shown in FIG. 5-1. Replace
the insulation and access cover before turning on power to the
heater.
RESET BUTTON
HERMOSTAT
PROTECTIVE
COVER
THERMOSTAT
DIAL POINTER
Page 17
Installation & Operation Manual
5 Wiring (continued)
17
Figure 5-2 Combination Thermostat and High Limit Control, SET 065-SET119
RD
BK
GR
RD
BK
BK
RD
SERVICE
GROUND SCREW
GROUND
SCREW
HIGH LIMIT
ELEMENT
THERMOSTAT
LINE
VOLTAGE
FIELD
SUPPLIED
FACTORY
INSTALLED
SET Wiring
(Single Element)
Model Volts / Phase Watts / AMPS Breaker Type *Wire Gage
SET065
240 VAC / 1 Ph 4500 / 18.3 25 AMP / DPDT 12 ga. THHW
SET080
240 VAC / 1 Ph 4500 / 18.3 25 AMP / DPDT 12 ga. THHW
SET119
240 VAC / 1 Ph 4500 / 18.3 25 AMP / DPDT 12 ga. THHW
*
Rated for 90°C
Table 5A Wiring SET065-SET119
Page 18
SDT/SET Installation & Operation Manual
18
5 Wiring
Indirect Water Heater Sensor Setup (Knight Boiler)
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and
dangerous operation.
CAUTION
1. Install the sensor inside the tank as depicted
in FIG. 5-3.
2. Connect the wire leads to the DHW Tank Sensor
(AUX) connection point on the Knight boiler
connection board (see FIG. 5-3).
Figure 5-3 Indirect Water Heater Controlled Using Tank Sensor
Install Tank Sensor
The tank sensor is a dual sensor which controls the
temperature of the tank from the boiler(see FIG. 5-3). The
tank sensor has a built-in high temperature limit set at
194°F.
NOTICE
The sensor supplied contains an Auto Reset High Limit (194°F).
3. The Knight boiler will automatically read the sensor
and default the tank temperature setting to 125°F.
4. Adjust the tank set point program. Reference the
Knight Installation and Operation Manual for a
detailed explanation of the tank set point program.
TANK BULBWELL
DHW TANK SENSOR / AUTO RESET HIGH LIMIT
(PLACE SENSOR IN TANK BULBWELL & SNAP
CLIP OVER BULBWELL)
DHW TANK
SENSOR
KNIGHT LOW VOLTAGE
TERMINAL STRIP
INDIRECT TANK
SOLAR SENSOR
(FIELD SUPPLIED)
KNIGHT BOILER
Page 19
SDT/SET Installation & Operation Manual
19
5 Wiring (continued)
Indirect Water Heater Controlled Using Aquastat and Zone Circulator / Valve
1. Install Aquastat to tank. Aquastat control (TST20016) can be ordered from your local Lochinvar distributor.
2. Connect Aquastat to the zone controller for the Indirect Water Heater Zone.
3. Adjust Aquastat to the desired temperature.
Figure 5-4 Wiring for Zone Control
TST20016
TEMPERATURE
ADJUSTMENT
ZONE CONTROL BOX
OR
ZONE VALVE
WIRE
CONNECTIONS
OR
ZONE CIRCULATOR
INDIRECT TANK
BOILER
AQUASTAT
CONTROL
SOLAR SENSOR
(FIELD SUPPLIED)
Page 20
SDT/SET Installation & Operation Manual
20
6 Start-up and Check-out
1. Make sure the system is free of leaks and that air is
purged from the system.
CAUTION
Fix any leaks found before proceeding
further. Leakage from the boiler piping
can result in severe damage to the boiler.
2. Many soldering fluxes contain Zinc Chloride which can
cause severe corrosion damage to stainless steel. After
completing all domestic water connections, flush the
indirect water heater thoroughly before leaving the
installation. This is particularly important if the
indirect water heater will be unused for an extended
period of time after installation. Flush the indirect
water heater by drawing at least three times its volume
from the tank.
3. Make sure that all electrical connections are made
correctly and that no exposed high voltage wiring is
present.
4. Make sure that each zone valve or circulator operates
when, and only when, its thermostat calls for heat. Let
each zone operate long enough to purge any remaining
air from the system.
5. Set the indirect water heater to the desired temperature.
Because hot water presents a scald hazard, it is best to set
the thermostat at 120°F or lower and raise it only if
necessary to provide adequate hot water.
6. Re-enable the burner and allow the boiler to operate.
Make sure that the boiler shuts down when the indirect
water heater is satisfied.
Page 21
SDT/SET Installation & Operation Manual
7 Maintenance
* Make sure that the rest of the solar, boiler and domestic
water piping is free of leaks.
* If there is an oil lubricated circulator in the system,
make sure it is lubricated as called for by the
circulator manufacturer.
* Make sure that the boiler is maintained in accordance
with the boiler manufacturer’s instructions.
* If a water treatment system is required to keep the
water chemistry within the parameters shown in
Table 2A (see Section 2 - Pre-Installation), make sure
that this system is properly maintained.
The Lochinvar SDT/SET series indirect water heater is an
extremely simple device and as such requires very little
maintenance. There are, however, several items which should
be checked out on an annual or as needed basis to ensure a
reliable supply of hot water:
Maintenance Schedule
Annual service by a qualified service technician
should include the following:
Any procedure required by local codes.
Verify system pressure. Air venting procedure may
require adding water to bring boiler system up to
pressure, typically 12 psig.
Manually operate T&P relief valve at least once a year.
This will release some hot water.
WARNING
Before operating a T&P relief valve, make
sure no one is in front of or around the
T&P relief valve discharge piping. Hot
discharge water can cause severe personal
injury or substantial property damage.
Move operating lever to open position for a few
seconds and then move it back, allowing it to snap
closed. After the T&P relief valve is operated, if it
continues to release water, close the cold water inlet to
the water heater immediately. Follow the draining
instructions, and replace the T&P relief valve. If the
T&P relief valve weeps periodically, it may be due to
thermal expansion. Do not plug the T&P relief valve or
discharge piping.
Homeowner monthly maintenance to include:
Visually check valves, pipes, and fittings for leaks. Call a
qualified service technician to repair leaks.
To Fill the Water Heater
1. Close the water heater drain valve by turning the knob
clockwise.
2. Open the cold water supply shutoff valve.
3. Open several hot water faucets to allow air to escape from
the system.
4. When a steady stream of water flows from the faucets, the
water heater is filled. Close the faucets and check for water
leaks at the water heater drain valve, combination
temperature and pressure relief valve and the hot and cold
water connections.
DANGER
Plugging the T&P relief valve or discharge
piping can cause excessive pressure in the
water heater, resulting in severe personal
injury, death, or substantial property
damage.
WARNING
Water from opened drain valves, unions and
other connections may be extremely hot. To
avoid severe personal injury, death, or
substantial property damage:
- Tighten all drain hose connections.
- Direct hot water away from all
persons.
To Drain the Water Heater
Should it become necessary to completely drain the water
heater, be sure to follow the steps below:
1. Disconnect the power supply to the heat source. C o n s ul t
the plumbing professional or electric company in your area
for service.
2. Close the cold water supply shutoff valve.
3. Open the drain valve on the water heater.
4. Open a hot water faucet to allow air to enter the system.
• If boiler water does not contain sufficient
antifreeze, the boiler water and the domestic water
must be drained.
If antifreeze is used in the boiler water, check concentration.
Boiler water (including additives) must be practically non-toxic,
having a toxicity rating or class of 1, as listed in the “Clinical
Toxicology of Commercial Products”. A maximum 50/50
mixture of inhibited propylene glycol is recommended. Follow
the antifreeze manufacturer’s instructions.
WARNING
Do not use automotive, ethylene glycol or
petroleum-based antifreeze. Do not use any
undiluted antifreeze. This can cause severe
personal injury, death, or substantial
property damage.
Drain the water heater if it will be shut off and exposed to
freezing temperatures. Freezing water will expand and damage
the water heater.
• If boiler water contains sufficient antifreeze, then
only the domestic water needs to be drained.
Follow instructions on circulator to oil, if required.
Check mixing valve, valves, pipes, and fittings for leaks.
Check function of the field-installed controls and valves.
See component manufacturer’s instructions.
Review homeowner’s maintenance responsibilities and
their frequencies, including any not listed in the
following section.
21
Page 22
SDT/SET Installation & Operation Manual
22
8 Performance Data
Table 8B SDT Backup Recovery Performance
How to Properly Size Your Indirect Water Heater
Use the First Hour Rating (FHR) to properly size your Indirect Water Heater. The FHR is the amount of hot water in gallons
the water heater can supply in the first hour of operation (starting with a tank full of hot water). The FHR is dependent on tank
capacity, source of heat, and the size of the burner.
The Indirect Water Heater and Boiler sizing charts can be found on pages 23 and 24. Locate your Indirect Water Heater and
Boiler along with your required First Hour Rating. This will also determine the flow needed between the Indirect Water Heater
and Boiler.
Table 8A SET Backup Recovery Performance
Model
Heat Exchanger
Volume
Gallons
Heated
Wa t e r
Volume
Gallons
Recovery
Back Up
Minutes
* First Draw
Gallons
Solar
65°F
Rise
90°F
Rise
115°F 140°F
SET065 2.2 28 78 108 34 26
SET080 2.2 35 89 123 44 31
SET119 3.2 44 120 166 55 42
Model
Heat Exchanger
Volume
Gallons
Heated
Wa t e r
Volume
Gallons
Recovery
Back Up
Minutes
Boiler
Output for
Recovery
BTU/HR
* First Draw
Gallons
Boiler Solar 65°F Rise 90°FRise 115°F 140°F
SDT065 1.9 2.2 32 8 13
128,000
42 30
SDT080 1.9 2.2 36 9 15
128,000
49 35
SDT119 2.6 3.2 53 10 17
217,000
65 50
*Amount of water drawn from tank with no energy input
NOTICE
The charts utilize only the upper boiler
coil and the upper half of the tank.
Page 23
SDT/SET Installation & Operation Manual
Table 8D First Hour Rating - 180°F Boiler Loop Water (Universal Sizing. Upper Coil SDT Models)
First Hour Rating - 180°F Boiler Loop Water
(Universal Sizing - 45,000 - 295,000 Btu/hr / SDT065-SDT119)
Boiler Supply Water
180 180 180
Circulator Flow GPM
5 8 12 16 20 5 8 12 16 20 5 8 12 16 20
Domestic Outlet
115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140
45,000 117 92 117 91 122 97 122 97 138 113 138 113
60,000 146 112 146 112 151 117 151 117 168 134 168 134
75,000 174 133 174 133 180 138 180 138 197 154 197 154
95,000 205 154 213 160 213 160 210 159 218 165 218 165 236 182 236 182 236 182
115,000 205 154 235 175 254 189 254 189 210 159 240 180 254 190 254 190 275 210 275 210 275 210 275 210
140,000 205 154 235 175 260 193 286 211 295 218 210 159 240 180 260 195 286 213 306 227 292 222 324 244 324 244 324 244 324 244
165,000 205 154 235 175 260 193 286 211 295 218 210 159 240 180 260 195 286 213 306 227 292 222 341 257 373 279 373 279 373 279
195,000 235 175 260 193 286 211 295 218 240 180 260 195 286 213 306 227 341 257 385 288 413 308 431 320
225,000 260 193 286 211 295 218 260 195 286 213 306 227 385 288 413 308 475 351
260,000 295 218 306 227 475 351
295,000 475 351
MAX BTU INPUT
90256 106525 118352 131827 139966 90257 106525 118352 131827 139967 123218 148780 171607 185675 217372
Boiler Heating Capacity
Model SDT065 SDT080 SDT119
23
8 Performance Data (continued)
Table 8C First Hour Rating - 180°F Boiler Loop Water (Knight and Wall Mount Boilers, Upper Coil SDT Models)
First Hour Rating - 180°F Boiler Loop Water
(Knight Boiler - SDT065 - SDT119)
Model SDT065 SDT080 SDT119
Boiler Supply Water
180 180 180
Circulator Flow
GPM
5 8 12 16 20 5 8 12 16 20 5 8 12 16 20
Domestic Outlet 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140
45,000 117 92 117 92 122 97 122 97 138 113 138 113
72,000 169 129 169 129 174 134 174 134 191 150 191 150
94,000 205 154 211 159 210 159 216 164 234 181 234 181
135,000 235 176 255 190 240 181 260 195 314 238 314 237
190,000 255 190 281 208 260 195 286 213 385 288 413 308
260,000 255 190 281 208 301 222 260 195 286 213 306 227 385 288 413 308 475 351
373,000 301 222 306 227 475 351
467,000 301 222 306 227 475 351
MAX BTU INPUT
90256 106525 116697 130105 139966 90257 106525 116698 130105 139967 123218 148780 171607 185675 217372
WB050
K/WB081
K/WB106
K/WB151
K/WB211
KB286
KB400
KB501
Boiler Heating Capacity
Note: Testing conducted with 50°F inlet cold water
Note: Testing conducted with 50°F inlet cold water
Page 24
SDT/SET Installation & Operation Manual
Table 8E First Hour Rating 200°F Boiler Loop Water (Universal Sizing, Upper Coil SDT Models)
First Hour Rating - 200°F Boiler Loop Water
(Universal Sizing - 45,000 - 295,000 Btu/hr / SDT065-119)
Boiler Supply Water
200 200 200
Circulator Flow GPM
5 8 12 16 20 5 8 12 16 20 5 8 12 16 20
Domestic Outlet
115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140
45,000 117 94 117 94 122 99 122 99 135 113 135 113
60,000 146 115 146 115 151 120 151 120 164 133 164 133
75,000 175 137 175 137 180 142 180 142 192 154 192 154
95,000 214 165 214 165 214 165 206 160 206 160 206 160 230 182 230 182 230 182
115,000 252 193 252 193 252 193 252 193 270 208 243 187 243 187 268 210 268 210 268 210
140,000 265 203 283 216 283 216 283 216 283 216 270 208 286 220 286 220 286 220 315 245 315 245 315 245 315 245
165,000 265 203 305 232 328 249 328 249 328 249 270 208 310 237 333 254 333 254 333 254 357 276 362 279 362 279 362 279 362 279
195,000 265 203 305 232 334 253 349 265 369 279 270 208 310 237 339 258 367 279 374 284 357 276 419 321 419 321 419 321 419 321
225,000 305 232 334 253 349 265 369 279 310 237 339 258 367 279 374 284 432
331
475 362 475 362 475 362
260,000 349 265 369 279 339 258 367 279 374 284 487 372 530 403 542 412
295,000 374 284 530 403 602 456
MAX BTU INPUT
121786 153207 168199 176783 188081 121786 153207 168199 176783 188081 162144 202222 231672 253492 291792
Boiler Heating Capacity
Model SDT065 SDT080 SDT119
8 Performance Data
24
Note: Testing conducted with 50°F inlet cold water
Page 25
SDT/SET Installation & Operation Manual
25
9 High Output Piping
High Domestic Hot Water Usage
When a large amount of hot water is required by a Domestic
Hot Water system, the dual coil indirect water heater can be
piped together when given the high volume needed to satisfy
the high load demands. This is achieved by piping the boiler
coil and solar coil together. This will enable heat transfer to
both the heat exchangers at the same time. This is done by
series piping or piping in parallel. A decision must be made to
choose a particular system based on the heating coil pressure
drop and the desired flows. This type of piping can be done
in a solar operation as well as with a boiler to acheive this
maximum heat transfer into the water.
Series Piping
With this style of installation, the solar / boiler supply piping
is connected to boiler water IN connection. When joining in
this operation, all fittings must be no smaller than one-inch in
size. Then, the boiler water OUT and the solar water IN are
connected. This will join the boiler and soiler coils together.
The return water is piped from the solar return to the solar /
boiler supply. See FIG. 9-1 on page 26.
NOTICE
For tank operation use the lower
bulbwell to turn the tank on and off.
Parallel Piping
With this style of installation, both heat exchanger are used at
the same time. Solar / boiler supply piping to the solar water
IN and boiler coils will be at the same temperature at the
same time. Then, the boiler return and the solar return are
piped together again to return the water to the heat source.
See FIG 9-2 on page 27.
NOTICE
For tank operation use the lower
bulbwell to turn the tank on and off.
The two-pipe reverse return hydronic loop is more balanced
and even than the two-pipe direct return hydronic loop. Both
heat exchangers receive the same temperature of water so it is
the same as the two-pipe return, but with more advantages.
One advantage over the two-pipe system is a balanced flow of
the reverse return system. This system can have a lower
pressure drop for both heat exchangers than the two-pipe
system, and it also requires less energy.
Page 26
SDT/SET Installation & Operation Manual
26
9 High Output Piping
Figure 9-1 Indirect Boiler with Series Piping
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
Table 9A
Series Configuration
Model
Boiler
Flow
GPM
Boiler
Loop
Temper ature
Continuous
Draw
GAL/HR
First Hour
Rating
GAL
Max Input
BTU/HR
SDT065
20 180° F 380 438 301,217
SDT080
20 180° F 391 461 301,217
SDT119
20 180° F 530 631 376,463
065
&
080
119
FLOW
FRICTION LOSS SDT SERIES
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
0
510
15 20 25 30 35
Table 9B SDT Series Friction Loss
PRESSURE
BACKFLOW
PREVENTER
REDUCING
VALV E
PRESSURE
GAUGE
TO
SYSTEM
BALL VALVE
(TYPICAL)
MAKE UP WATER
AIR
SEPARATOR
SYSTEM
CIRCULATOR
EXPANSION
TAN K
SYSTEM
SUPPLY
SENSOR
DRAIN POINT
(TYPICAL)
(TYPICAL)
TEMPERATURE/
UNION
PRESSURE
GAUGE
NOT TO EXCEED 4 PIPE DIA. OR
A MAXIMUM OF 12” APART
(RECOMMENDED)
BOILER
CIRCULATOR
DRAIN
PRESSURE
RELIEF VALVE
Y-STRAINER
DOMESTIC
HOT WATER
CIRCULATOR
KNIGHT
BOILER
BOILER BACKUP
HEAT EXCHANGER
(SDT MODELS ONLY)
SOLAR
HEAT EXCHANGER
FROM
SYSTEM
HOT
WATER
ANTI-SCALD
MIXING VALVE
SQUIRE
OUT
COLD
WATER
IN
TEMPERATURE/
PRESSURE
RELIEF VALVE
BOILER
TANK SENSOR/
AQUASTAT
SOLAR SENSOR
CHECK VALVE
DRAIN
(FIELD SUPPLY)
RECIRCULATION
PUMP
Page 27
SDT/SET Installation & Operation Manual
27
9 High Output Piping (continued)
Figure 9-2 Indirect Boiler with Parallel Piping
Please note that these illustrations are meant to show system piping concept only, the installer is responsible
for all equipment and detailing required by local codes.
NOTICE
Table 9C
Parallel Configuration
Model
Boiler
Flow
GPM
Boiler
Loop
Temper ature
Continuous
Draw
GAL/HR
First Hour
Rating
GAL
Max Input
BTU/HR
SDT065
20 180° F 338 396 269,840
SDT080
20 180° F 344 414 269,840
SDT119
20 180° F 466 567 336,198
Table 9D SDT Parallel Friction Loss
FRICTION LOSS SDT PARALL
E
6
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
6
FT/HD
FLOW
FRICTION LOSS SDT PARALLEL
119
065 & 080
065 & 080
119
60 70 80
065 & 080
119
L
10
0
20
30
40
50
60
70
80
PRESSURE
REDUCING VALVE
SYSTEM
SUPPLY
SENSOR
DRAIN POINT
(TYPICAL)
PRESSURE
GAUGE
NOT TO EXCEED 4 PIPE DIA. OR
A MAXIMUM OF 12 “ APART
Y-STRAINER
(RECOMMENDED)
BOILER
CIRCULATOR
HEAT EXCHANGER
(SDT MODELS ONLY)
TO
SYSTEM
BALL VALVE
(TYPICAL)
BACKFLOW
PREVENTER
MAKE UP WATER
AIR
SEPARATOR
SYSTEM
CIRCULATOR
EXPANSION
TAN K
DOMESTIC
HOT WATER
CIRCULATOR
BOILER BACKUP
SYSTEM
FROM
ANTI-SCALD
MIXING VALVE
HOT
WATER
OUT
COLD
WATER
IN
TEMPERATURE/
PRESSURE
RELIEF VALVE
BOILER
TANK SENSOR/
AQUASTAT
SOLAR SENSOR
UNION
(TYPICAL)
TEMPERATURE/
PRESSURE
GAUGE
DRAIN
PRESSURE
RELIEF VALVE
KNIGHT
BOILER
SOLAR
HEAT EXCHANGER
SQUIRE
CHECK VALVE
DRAIN
(FIELD SUPPLY)
RECIRCULATION
PUMP
Page 28
Revision Notes: Revision A (ECO C05788) initial release.
Revision B (ECO C05936) reflects the addition of “High
Output Piping” section on pages 25-27, Series and Parallel
piping diagrams on pages 26-27, and new friction loss charts
for SDT Series and Parallel on pages 26 and 27.
SDT-SET-I-O Rev B
7/10 - Printed in U.S.A.
Loading...