TriangleTube SMART Series Instruction Manual

Revision date : 06/25/19
Technical Specifications
Installation & Maintenance Manual
SMART
Indirect Fired Water Heater
30 - 40 - 50 - 60 - 80 - 100 - 120
Before proceeding with installation and operation, read entire manual carefully. Failure to do so
can cause property damage or personal injury.
• When receiving the SMART unit, any claims for damage or shortage in shipment must be filed immediately against the
transportation company by the consignee.
• Customer must register unit within sixty (60) days of installation in order to gain warranty coverage. See Warranty Card for
details.
• Leave all documentation received with appliance with the owner for future reference.
• Installation and service should only be performed by a qualified installer or service technician.
• Installations and service should be performed by a licensed plumber or gas fitter in the Commonwealth of Massachusetts.
NOTICE
WARNING
2010-49 Smart Manual

INTENTIONALLY LEFT BLANK

iii
TABLE OF CONTENTS
PRODUCT AND SAFETY INFORMATION......................................................................... VII
CHAPTER 1 - PRE-INSTALLATION ...................................................................................... 1
1.1. Codes Compliance.......................................................................................................................... 1
1.2. Codes Restrictions.......................................................................................................................... 1
1.3. Operating Restrictions.................................................................................................................... 1
1.4. Locating Water Heater....................................................................................................................2
1.5. Recommended Clearances............................................................................................................2
CHAPTER 2 - INSTALLATION - PIPING .............................................................................. 3
2.1. Temperature & Pressure (T&P) Relief Valve.................................................................................3
2.1.1 Standard Installation.............................................................................................................3
2.1.2 Commonwealth of Massachusetts Installation ..................................................................3
2.1.3 T&P Relief Valve Discharge Piping .......................................................................................3
2.2. Drain Valve.......................................................................................................................................4
2.2.1 Standard Installation.............................................................................................................4
2.2.2 Commonwealth of Massachusetts Installation ..................................................................4
2.3. Manual Air Vent ...............................................................................................................................4
2.4. Thermal Expansion .........................................................................................................................4
2.5. Water Hammer................................................................................................................................4
2.6. Vacuum Breaker..............................................................................................................................4
2.7. General Piping .................................................................................................................................4
2.8. Domestic Piping ..............................................................................................................................4
2.9. Thermostatic Mixing Valve.............................................................................................................5
2.10. Recirculation Piping. .......................................................................................................................5
2.11. Multiple Water Heater Systems .....................................................................................................5
2.12. Boiler Piping.....................................................................................................................................6
CHAPTER 3 - INSTALLATION - WIRING ........................................................................... 15
3.1. Wiring Requirements .................................................................................................................... 15
3.2. Circulators ..................................................................................................................................... 15
3.3. Zone Valves.................................................................................................................................... 15
3.4. Snap Set Connection.................................................................................................................... 15
CHAPTER 4 - WATER HEATER START-UP ....................................................................... 21
4.1. Filling the Inner (Domestic Water) Tank...................................................................................... 21
4.2. Filling the Outer (Boiler Water) Tank ........................................................................................... 21
4.3. Adjusting the Water Heater Thermostat.................................................................................... 22

iv
TABLE OF CONTENTS
CHAPTER 5 - WATER HEATER MAINTENANCE...............................................................23
5.1. Maintenance Schedule ................................................................................................................ 23
5.1.1 Annual service by qualified service technician should include the following:................23
5.1.2 Homeowner monthly maintenance to include:.................................................................23
5.2. Filling Water Heater...................................................................................................................... 23
5.3. Draining Water Heater ................................................................................................................. 23
5.3.1 Draining Inner (Domestic Water) Tank. .............................................................................24
5.3.2 Draining Outer (Boiler Water) Tank....................................................................................24
CHAPTER 6 - REPLACEMENT PARTS ..............................................................................25
CHAPTER 7 - WATER HEATER SPECIFICATIONS AND PERFORMANCES ....................26

v
INDEX OF ILLUSTRATIONS AND TABLES
Fig. 1 - SMART Clearances - View from the Top ......................................................................................2
Fig. 2 - Standard Installation - Domestic Piping - SMART Series...........................................................7
Fig. 3 - Standard Installation - Domestic Piping with Recirculation - SMART Series ............................7
Fig. 4 - Optional Installation - Domestic Piping with Recirculation - SMART Series..............................8
Fig. 5 - Drain Tube Assembly - Commonwealth of Massachussets........................................................9
Fig. 6 - Commonwealth of Massachussets - Domestic Piping SMART Series ......................................9
Fig. 7 - SMART System Piping with 3-Port Zone Valve (Domestic Priority).........................................10
Fig. 8 - SMART System Piping with 2-Port Zone Valves (Domestic Priority).......................................10
Fig. 9 - SMART System Piping with Zone Valves (Non Domestic Priority) ...........................................11
Fig. 10 - SMART System Piping with Zone Circulators ...........................................................................11
Fig. 11 - Multiple SMART Series Water Heater System Domestic Piping - Parallel..............................12
Fig. 12 - SMART System Piping with Zone Circulators ..........................................................................12
Fig. 13 - Multiple SMART Series Water Heater System Boiler Piping Reverse Return Balanced Flow..... 13
Fig. 14 - Multiple SMART Series Water Heater System Boiler Piping - Manifold ................................. 13
Fig. 15 - Snap Set Wiring........................................................................................................................... 15
Fig. 16 - Typical 4-wire Zone Valve Zoning, with Domestic Priority....................................................... 16
Fig. 17 - Typical 3-wire Zone Valve Zoning, with Domestic Priority....................................................... 16
Fig. 18 - Typical 4-wire Zone Valve Zoning, without Domestic Priority................................................. 17
Fig. 19 - Typical 3-wire Zone Valve Zoning, without Domestic Priority................................................. 17
Fig. 20 - Typical Circulator Zoning with Domestic Priority....................................................................18
Fig. 21 - Typical Circulator Zoning without Domestic Priority...............................................................18
Fig. 22 - Priority Zone Circulator Wiring..................................................................................................19
Fig. 23 - SMART Series Temperature Knob.......................................................................................... 22
Fig. 24 - SMART Assembly...................................................................................................................... 25
Fig. 25 - SMART Cover Plate Assembly ................................................................................................. 25
Fig. 26 - SMART Dimensions - Side View............................................................................................... 26
Fig. 27 - SMART Dimensions - Top View .................................................................................................27
Table 1 - Piping dimensions........................................................................................................................5
Table 2 - SMART Water Heater Specifications.......................................................................................27
Table 3 - SMART Water Heater Performance at 200°F boiler water supply (140°F DHW outlet)..... 28
Table 4 - SMART Water Heater Performance at 200°F boiler water supply (115°F DHW outlet) ..... 28

INTENTIONALLY LEFT BLANK

vii
SAFETY
PRODUCT AND SAFETY INFORMATION
This manual contains important information with respect to the
installation, starting up and maintenance of the appliance.
This manual must be provided to the Homeowner, who will
keep it in a safe place for future reference.
Triangle Tube accepts no liability for any damage,
injury, or loss of life resulting from incorrect
installation, alteration of any factory supplied
parts, or the use of parts or ttings not specied by
Triangle Tube. If there is a conict or doubt about the
proper installation of the unit or any factory supplied
replacement parts please contact Triangle Tube
Technical Support.
DEFINITIONS
The following terms are used throughout this manual
to bring attention to the presence of potential hazards
or to important information concerning the product.
Indicates the presence of a hazardous situa-
tion which, if ignored, will result in substantial
property damage, serious injury, or death.
Indicates a potentially hazardous situation
which, if ignored, can result in substantial
property damage, serious injury, or death.
Indicates a potentially hazardous situation
which, if ignored, can result in minor property
damage, or injury.
Indicates special instructions on installation,
operation or maintenance, which are import-
ant to the equipment but not related to person-
al injury hazards.
Indicates recommendations made by Triangle
Tube for the installers, which will help to ensure
optimum operation and longevity of the equip-
ment.
DANGER
WARNING
CAUTION
NOTICE
BEST PRACTICE
IMPORTANT SAFETY INFORMATION FOR
THE HOMEOWNER AND THE INSTALLER DANGER
• Water temperatures over 125ºF can cause severe
burns instantly or death from scalding.
• Children, disabled and elderly are at highest risk of
being scalded.
• Never leave them unattended in or near shower,
bathtub or sink.
• Never allow small children to use a hot water faucet
or draw their own bath.
• If anyone using hot water in the building fits the
above description or if local codes or state laws
require specific water temperatures at hot water
faucet, it is recommended:
- To install a thermostatic mixing valve at this
appliance or at each water faucet.
or
- To set the thermostat knob for the lowest
temperature which satisfies your hot water needs.
• Water drained from the system drain valves may be
extremely hot. To avoid injury:
– Make sure all connections are tight.
– Direct water flow away from any person.
Bacteria can develop in the domestic water
system if certain minimum water tempera-
tures are not maintained. Failure to maintain
at least 140°F [60°C] domestic hot water tem-
perature (using the Antilegionella function
of your boiler, if any) can result in bacteria
development, which can result in serious in-
jury, or death.
WARNING
Hot Water Can Scald!

• It is prohibited to carry out any modifications to
the appliance without prior written consent from
Triangle Tube.
• Faulty parts must only be replaced by genuine
Triangle Tube factory parts.
• To prevent damage to the inner tank, the Installer
must:
–Always fill inner tank prior to outer tank and always
drain outer tank prior to inner tank.
–Relieve primary system pressure below 15 psig
prior to draining inner tank.
• Failure to comply with these instructions can result
in minor property damage, or injury.
• Protection must be taken against excessive
temperature and pressure! Installation of a
Temperature & Pressure (T&P) relief valve is required.
• Failure to comply with these instructions can result
in minor property damage, or injury.
CAUTION
CAUTION
• In case of any anomaly, please call your qualified
service technician.
• Make sure to reference the unit’s model number and
serial number from the rating label when inquiring
about service or troubleshooting.
• Triangle Tube reserves the right to change the
technical characteristics, components and features of
its products without prior notice. Check for an updated
version of this manual at www.triangletube.com.
NOTICE
viii
SAFETY
PRODUCT AND SAFETY INFORMATION

1
CHAPTER 1
CHAPTER 1 - PRE-I NS TALL ATI ON
1.1. Codes Compliance
Water heater installation must conform with the in-
structions in this manual and where applicable:
• local, state, provincial, and national codes, laws,
regulations and ordinances.
• in Canada - CAN / CGA B149.1 or B149.2 Instal-
lation Code.
SMART water heaters are exempt from ASME Section
VIII, Division 1 Code construction per Interpretation VIII-
86-136. Check with local codes for applicability.
SMART Series water heaters will absorb less
than 200,000 BTU/hr when domestic wa-
ter outlet temperature is 210ºF and boil-
er water supply temperature is 240ºF. List-
ed outputs are based on ASME Section VIII
Interpretation VIII-1-86-136.
Where recommendations in this manual dier from lo-
cal, or national codes, the local or national codes take
precedence.
1.2. Codes Restrictions
Single wall heat exchanger in the SMART water heater
complies with National Standard Plumbing Code, pro-
vided that:
• Boiler water (including additives) is practically
non-toxic, having toxicity rating or class of 1, as
listed in Clinical Toxicology of Commercial
Products, and
• Boiler water pressure is limited to maximum
30 psig by approved relief valve.
Single wall heat exchangers are permitted under the
Uniform Plumbing code - Paragraph L3.2. and L3.3 if
they satisfy all of the following requirements.
1. The heat transfer medium is potable water or con-
tains only substances which are recognized as safe
by the U.S. Food and Drug Administration.
2. The pressure of the heat transfer medium is main-
tained less than the normal minimum operating
pressure of the potable water system
Exception: Steam complying with section #1 above.
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.
NOTICE
Other heat exchanger designs may be permitted where
approved by the Administrative Authority.
1.3. Operating Restrictions
• Maximum domestic hot water temperature is 194ºF
for commercial applications and 140ºF for residen-
tial applications.
• Maximum boiler water temperature is 210ºF.
• Maximum working pressure for inner (domestic
water) tank is 150 psig.
• Maximum working pressure for the outer (boiler
water) tank is 45 psig.
• Water quality limitations (based on E.P.A National
Secondary Drinking Water Regulations):
– Chloride, less than 150 ppm or mg/l
– pH value min. 6, max. 8
– Total hardness 3 - 7 grains/gallon or 50-120
ppm or mg/l.
– Total Dissolved Solids (TDS), less than 120 ppm
or mg/l.
– Iron less than 0.3 ppm or mg/l.
– Aluminum, less than 0.2 ppm or mg/l.
– Copper, less than 1 ppm or mg/l.
– Manganese, less than 0.05 ppm or mg/l.
– Zinc, less than 5 ppm or mg/l.
In hard water areas (more than 7 grains of
hardness) soften the cold domestic supply wa-
ter to the appliance to prevent scaling.
BEST PRACTICE
• Any water conditioning system must be in-
stalled and maintained in accordance with
manufacturer’s specifications.
• Do not install the water heater on any appli-
cation if the boiler piping contains non-ox-
ygen barrier tubing or if the boiler piping is
considered an “open system”. Exposing the
tank of the water heater to oxygen contam-
ination will lead to premature tank failure
and denial of the warranty.
NOTICE

2
CHAPTER 1
CHAPTER 1 - PRE-INSTALLATION
1.4. Locating Water Heater
• This water heater is not intended for outdoor instal-
lations.
• Keep distance between boiler and water heater to
a minimum to:
– Reduce piping heat loss
– Provide minimal friction loss
• Locate water heater so that any leakage from the
tank or water connections will not cause damage
to the area adjoining the water heater or to lower
oors in the structure.
– When such a location is unavoidable, a suitable
drain pan with adequate drainage, should be
placed under the water heater.
• The SMART Series Water Heaters are designed for
vertical installation only.
BEST PRACTICE
1.5. Recommended Clearances
Water heater should be installed to allow adequate
clearance for servicing.
Zero clearance is permissible to any side of the SMART
Series water heater that has no connection, but infor-
mation labels may be hidden.
Also take into account the clearance required for any
accessory that needs to be installed on the heating
and/or domestic circuits.
• Recommended top or vertical clearance is
12” minimum.
• Refer to boiler manual for boiler clearances.
Fig. 1 - SMART Clearances - View from the Top
Water
Heater
12” Minimum
Wall

3
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
2.1. Temperature & Pressure (T&P) Relief
Valve
To reduce risk of excessive pressures and
temperatures in the water heater, install tem-
perature and pressure protective equipment
required by local codes, but no less than a com-
bination temperature and pressure relief valve
certified by a nationally recognized testing lab-
oratory 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. This valve must
be marked with a maximum working pressure
of the water heater.
• Every SMART water heater must be protected with
a T&P relief valve.
• Determine T&P relief valve size by the following
specications, unless they conict with local codes:
– SMART 30/40/50: 3/4”NPT with an AGA Rating
of 100,000 BTU/hr and a maximum pressure rat-
ing of 150 psig. (Watts 100XL-8 or equivalent).
– SMART 60/80/100/120: 3/4”NPT with an AGA
Rating of 200,000 BTU/hr and a maximum pres-
sure rating of 150 psig. (Watts 40XL-8 or equiv-
alent).
For proper operation of the T&P and to prevent
the T&P from activating due to boiler water
temperature, use a T&P relief valve with extend-
ed element. We recommended an 8” minimum
length to ensure element senses domestic water.
CAUTION
2.1.1 Standard Installation
• Install T&P relief valve in the Auxiliary connection
located behind the air vent on the top of the water
heater (Refer to Fig. 2 on page 7).
or
• Install the T&P relief valve in the run (straight through
leg) of a tee located at the domestic hot water outlet
when using the Auxiliary connection for a recircula-
tion return (Refer to Fig. 3 on page 7).
2.1.2 Commonwealth of Massachusetts Installation
Follow this procedure for jurisdictions requiring a vacu-
um breaker to be installed on the domestic cold water
inlet.
• Install the T&P valve in the run (straight through leg)
of a tee located at the domestic hot water outlet.
Use a long element T&P relief valve (Refer to Fig. 6
on page 9).
2.1.3 T&P Relief Valve Discharge Piping
• T&P relief valve discharge piping must be:
– Made of material serviceable for temperatures
of 250ºF or greater.
– Directed so that hot water ows 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.
• T&P relief valve discharge piping must not be:
– Excessively long. Using more than 2 elbows or
15 feet of piping can reduce discharge capacity.
– Directly connected to a drain. Terminate discharge
piping within 6”from drain. Refer to local codes.
– Plugged, reduced or restricted.
– Subject to freezing.
Do not install any valve between T&P relief
valve and tank connection or on T&P relief valve
discharge piping. Do not plug T&P relief valve
or discharge piping. Improper placement and
piping of T&P relief valve can cause substantial
property damage, serious injury, or death.
WARNING
NOTICE

4
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
2.2. Drain Valve
Drain valve and ttings are supplied by others.
2.2.1 Standard Installation
• Install a tee connection at the domestic cold water
inlet (Refer to Fig 3 & Fig. 3 on page 7, and Fig.
4 on page 8).
• Pipe the drain piping with drain valve from the tee
connection to:
– a suitable place for disposal
or
– terminate within 12”of the oor
2.2.2 Commonwealth of Massachusetts Installation
• Thread a 3/4” close nipple onto the Auxiliary con-
nection and insert an open end dip tube into the
Auxiliary connection on top of water heater, as
shown in Fig. 5 on page 9.
• Install a 3/4”NPT elbow to the Auxiliary connection,
refer to Fig. 6 on page 9.
• Pipe the drain piping with drain valve from the el-
bow connection to :
– a suitable place for disposal
or
– terminate within 12”of the oor
2.3. Manual Air Vent
1. A manual air vent is factory installed.
2. Open manual air vent. Once the tank is full and air
has stopped escaping, close the manual air vent.
2.4. Thermal Expansion
If a backow preventer, check valve or pressure reduc-
ing valve is piped on cold water supply piping of water
heater, install an expansion tank on cold water supply
line to prevent normal thermal expansion from repeat-
edly forcing open T&P relief valve.
T&P relief valve is not intended for constant duty,
such as relief of pressure due to repeated nor-
mal system expansion. Correct this condition by
installing a properly sized expansion tank in do-
mestic water system.
Refer to expansion tank manufacturer’s instal-
lation instructions for proper sizing.
CAUTION
2.5. Water Hammer
Dishwashers, clothes washers and fast-closing positive
shut-o valves incorporated in the system all contrib-
ute to creating water shock. Install a water hammer ar-
rester to prevent damage to pipes and appliances. See
device manufacturer’s instructions for application and
installation.
Water hammering within the domestic piping
system can cause premature failure of the inner
tank of the water heater. This type of failure is
NOT covered under warranty.
2.6. Vacuum Breaker
Installing a vacuum breaker (Watts N36-M1 or equiv-
alent) on the domestic cold water inlet will prevent
damage to the inner tank if a negative pressure is de-
veloped in the domestic supply line. See manufactur-
er’s instructions for application and installation of the
vacuum breaker.
2.7. General Piping
• For domestic water piping diagram, refer to Fig. 2
on page 7 thru Fig. 6 on page 9.
• For Boiler water piping, refer to Fig. 7 on page 10
thru Fig. 14 on page 13 Fig. 10 on page 11.
• For Multiple water heater domestic and boiler pip-
ing, refer to Fig. 11 on page 12 thru Fig. 14 on
page 13.
• See Table 1 on page 5 for domestic and boiler
piping connection sizes .
• All plumbing must meet or exceed all local, state
and national plumbing codes.
• Use pipe dope or tape suitable for potable water
systems.
• Use isolation valves to isolate system components.
2.8. Domestic Piping
• Union on domestic hot water outlet should be piped
at a higher elevation than domestic water drain valve.
This will make draining the water heater easier.
• Install unions for easy removal of water heater. It
is recommended to use dielectric unions or cou-
plings to protect hot and cold water ttings from
corrosion when connecting dissimilar materials
such as copper and galvanized iron pipe.
NOTICE

5
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
• If copper pipe is used for domestic water connections,
rst solder pipe to a threaded adapter and then screw
adapter into cold water inlet on top of water heater.
Inlet connection contains an internal plastic dip tube
which can be damaged by heat from soldering.
Do not apply heat to the cold water inlet when
making sweat connections to water heater.
Sweat tubing to adapter before fitting adapter
to cold water inlet of heater. It is imperative that
no heat be applied to the cold water inlet, as it
contains a non metallic dip tube.
• When the water supply pressure is higher than 70
psig, it is recommended to install a pressure reduc-
ing valve on cold water supply line to prevent wa-
ter loss through T&P relief valve.
• If the water heater will replace a tankless coil in the
boiler, disconnect the piping to coil and allow the
water to drain from coil. Do not plug the tankless coil.
Plugging tankless coil inlet and outlet will re-
sult in substantial property damage, serious
injury, or death.
2.9. Thermostatic Mixing Valve
• It is recommended to install an optional mixing
valve on the domestic hot water outlet.
• Mixing valve must comply with ASSE 1017
NOTICE
DANGER
Table 1 - Piping dimensions
Water
Heater
Model
Connections (inches) Recirculation Dip
Tube Draining Dip Tube
Recommend-
ed Minimum
Boiler Piping
Domestic
Water
Inlet/Outlet
(NPT)
Boiler Water
Supply/
Return
(NPSC)
Auxiliary Connection
(NPSC)
Length
(Inches)
Diam-
eter
(Inches)
Length
(Inches)
Diameter
(Inches)
Diameter
(Inches)
SMART 30 3/4 1 3/4 34 3/4 34 3/4 1
SMART 40 3/4 1 3/4 43 3/4 43 3/4 1
SMART 50 3/4 1 1/4 3/4 25 3/4 52 3/4 1
SMART 60 3/4 1 1/4 3/4 34 3/4 62 3/4 1 1/4
SMART 80 1 1/2 1 1/2 1 1/2 25 1 1/2 48 1 1/2 1 1/4
SMART 100 1 1/2 1 1/2 1 1/2 32 1 1/2 61 1 1/2 1 1/2
SMART 120 1 1/2 2 1 1/2 32 1 1/2 61 1 1/2 1 1/2
2.11. Multiple Water Heater Systems
• Parallel Pipe Recirculation Systems - Manifold recircu-
lation return to all water heaters.
• Series Piped Systems - Piped return to the leading
(cold water inlet) water heater.
• Install an automatic mixing valve either at the hot wa-
ter outlet of water heater or each hot water faucet.
Failure to install automatic mixing valve
where recommended will result in serious in-
jury, or death.
DANGER
2.10. Recirculation Piping.
• T&P relief valve must be installed in run (straight
through leg) of tee located at domestic hot water
outlet of water heater.
• It is recommended that the recirculation dip tube
be installed in auxiliary connection using a close
nipple assembly as shown in Fig. 3 on page 7.
See Table 1 below for diameter and length of dip
tube.
• A stainless steel or bronze circulator is required on
potable water systems.
• Install automatic mixing valve either at the hot wa-
ter outlet of water heater or each hot water faucet

6
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
2.12. Boiler Piping
• If plastic pipe is used for boiler water piping, it must
have a maximum oxygen diusion rate of 0.1 mg/
liter-day for boiler and water heater protection.
The SMART IDWH must be installed on a closed
type hydronic system. Failure to provide such
a system will result in premature failure of the
tank and annulment of warranty.
• Boiler water (including additives) must be practical-
ly non-toxic, having toxicity rating or class of 1, as
listed in Clinical Toxicology of Commercial Prod-
ucts.
Antifreeze can only be used if the boiler water
pressure relief valve is set to 30 psig or below.
NOTICE
CAUTION
• If antifreeze is used in the boiler system, local codes
may require a backow preventer on cold water
supply line. Use antifreeze specically intended for
hydronic heating systems. Inhibited propylene gly-
col is recommended at a maximum 50/50 mixture.
Do not use automotive, ethylene glycol or
petroleum-based antifreeze. Do not use any
undiluted antifreeze. This can cause substan-
tial property damage, serious injury, or death.
DANGER

7
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
Fig. 2 - Standard Installation - Domestic Piping - SMART Series
1. Shut-o valve
2. Recirculation Circulator
3. Flow Check Valve
4. T&P relief valve
5. Unions
6. Backow preventer or pressure reducing valve(*)
7. Drain valve
8. Thermal expansion tank (potable)
9. Recirculation dip tube
10. Thermostatic mixing valve (*)
(*) Optional devices may be required by local codes.
Cold Water
Inlet
61
12" min.
Heat Trap
Loop
(Optional)
12" min.
Heat Trap
Loop
(Optional)
15
51
8
7
4
10
MH
C
7
Cold Water
Inlet
61
Recirculating
Loop
23
4
15
51
8
12" min.
Heat Trap
Loop
(Optional)
12" min.
Heat Trap
Loop
(Optional)
9
Fig. 3 - Standard Installation - Domestic Piping with Recirculation - SMART Series

8
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
1. Shut-o valve
2. Recirculation Circulator
3. Flow Check Valve
4. T&P relief valve
5. Unions
6. Backow preventer or pressure reducing valve(*)
7. Drain valve
8. Thermal expansion tank (potable)
(*) Optional devices may be required by local codes
7
Cold Water
Inlet
61
Recirculating
Loop
23
4
15
51
8
12" min.
Heat Trap
Loop
(Optional)
12" min.
Heat Trap
Loop
(Optional)
Fig. 4 - Optional Installation - Domestic Piping with Recirculation - SMART Series

9
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
1. Shut-o valves
4. T&P relief valve
5. Unions
6. Backow preventer or pressure reducing valve (*)
7. Drain valve
8. Thermal expansion tank (potable)
9. Vacuum breaker
10. Mixing valve (*)
11. Dip tube - Draining per Chart 1
(*) Optional devices may be required by local codes.
Fig. 5 - Drain Tube Assembly - Commonwealth of Massachussets
Fig. 6 - Commonwealth of Massachussets - Domestic Piping SMART Series
Cold Water
Inlet
61
12" min.
Heat Trap
Loop
(Optional)
12" min.
Heat Trap
Loop
(Optional)
4
15
5
8
9
11
10
MH
C7

10
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
1
2
4
1
3- Port
Priority
Valve
31
6
Cold water
inlet
5
4
1
3
2
2-Port
Priority Valve
(normally open)
2-Port
Priority Valve
(normally close)
1
6
5
Cold water
inlet
Fig. 8 - SMART System Piping with 2-Port Zone Valves (Domestic Priority)
1. Shut-o valves
2. Circulator
3. Expansion tank
4. Drain valve
5. Feed valve
6. Air separator
Fig. 7 - SMART System Piping with 3-Port Zone Valve (Domestic Priority)

11
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
1. Shut-o valves
2. Circulator
3. Flow check valve
4. Expansion tank
5. Drain valve
6. Feed valve
7. Air separator
Fig. 9 - SMART System Piping with Zone Valves (Non Domestic Priority)
Fig. 10 - SMART System Piping with Zone Circulators

12
CHAPTER 2
CHAPTER 2 - INSTALLATION - PIPING
Fig. 11 - Multiple SMART Series Water Heater System Domestic Piping - Parallel
Fig. 12 - SMART System Piping with Zone Circulators
• Recommended for most applications.
• Any one water heater tank thermo-
stat may be utilized to control system
temperature.
• Install automatic mixing valve at ei-
ther the hot water outlet of the water
heater system or at each hot water
xture.
• Each tank should be piped with a
drain as shown in Fig. 2 on page 7
• Recommended for applications in
which there is a large water consump-
tion in short period of time.
• A maximum of 3 water heaters may
be piped in series.
• Utilize the lead (hot water outlet)
SMART tank thermostat to control
system temperature.
• Install automatic mixing valve at ei-
ther the hot water outlet of the water
heater system or at each hot water
xture.
• Each tank should be piped with a
drain as shown in Fig. 2 on page 7.