INDIRECT-FIRED
WATER HEATER
A Spanish language version of these instructions is available by contacting
the manufacturer listed on the rating plate.
La version espanola de estas instruccions se puede obtener al escribirle a
la fábrica cuyo nombre aparece in la placa de especificaciones.
WARNING
To avoid damage or injury, there
must be no materials stored
against the indirect water heater
and proper care shall be taken
to avoid unnecessary contact
(especially by children) with the
indirect water heater.

Do not store or use
gasoline or other flammable
liquids in the vicinity of this
water heater or any other
appliance.
INSTALLATION/OPERATING MANUAL
WITH PARTS LISTING AND TROUBLESHOOTING GUIDE
For your family’s comfort, safety, and convenience, we
recommend this water heater be installed and serviced by a
plumbing professional.
238-43480-00G REV 10/13
CONGRATULATIONS!
You have just purchased one of the finest water heaters
on the market today!
This installation, operation, and instruction manual will
explain in detail the installation and maintenance of your
new indirect water heater. We strongly recommend that
you contact a plumbing professional for the installation
of this water heater.
We require that you carefully read this manual, as well as
the enclosed warranty, and refer to it if questions arise.
If you have any specific questions concerning your
warranty, please consult the plumbing professional from
whom your water heater was purchased. For your
records we recommend that you write the model, serial
number and installation date of your water heater in the
back of this manual.
This manual should be kept with the water heater.
We’re committed to providing you with the finest water
heater made.
2
CAUTION
The maximum boiler water supply temperature to the indirect heat
exchanger must not exceed 240°F (115°C).
NOTICE
Insulation blankets are not required for this water heater. This
water heater meets or exceeds the ASHRAE/IES 90.1b standards with
respect to insulation and standby loss requirements.
TABLE OF CONTENTS
IIIIIIIVVVIVIIVIIIIXX-
IMPORTANT INFORMATION…………….…..
SPECIFICATIONS……………………………….
GENERAL INFORMATION…………………….
PRE-INSTALLATION……………………………
WATER CONNECTIONS………………………..
ELECTRICAL CONNECTIONS………………..
OPERATING INSTRUCTIONS…………………
MAINTENANCE………………………………….
TROUBLESHOOTING GUIDE…………………
PARTS LIST……………………………………….
NOTES……………………………………………..
3
4
8
12
15
20
25
26
29
32
34
36
SECTION I
IMPORTANT INFORMATION
-READ CAREFULLYThe equipment must be installed in accordance with those
installation regulations required in the area where the installation
is to be made. These regulations must be carefully followed in
all cases. Authorities having jurisdiction shall be consulted
before installations are made.
All wiring on water heaters installed in the USA must be in
accordance with the National Electrical Code and/or local
regulations; or in Canada, installed in accordance with the
Canadian Electrical Code and/or local regulations.
The following terms are used throughout this manual to bring
attention to the presence of hazards of various risk levels, or to
important information concerning product life.
CAUTION
DANGER
Indicates a potentially
hazardous situation, which,
if not avoided, may result
in moderate, or minor
injury or property damage.
Indicates an imminently
hazardous situation, which,
if not avoided, will result in
death, serious injury, or
substantial property
damage.
NOTICE
WARNING
Indicates special
instructions on installation,
operation or maintenance,
which are important but
not related to personal
injury hazards.
Indicates a potentially
hazardous situation, which,
if not avoided, could result
in death, serious injury, or
substantial property
damage.
4
Important Information continued-
DANGER
DO NOT store or use gasoline or other flammable, combustible, or
corrosive vapors and/or liquids in the vicinity of this or any other
appliance.
IF YOU SMELL GAS:
 DO NOT try to light any appliance.
 DO NOT touch any electric switch; do not use any
telephone in your building.
 Immediately call your gas supplier from a telephone in another
building. Follow the gas supplier’s instructions.
 If you cannot reach your gas supplier, call the fire department
DO NOT OPERATE THE APPLIANCE UNTIL THE LEAKAGE IS
CORRECTED!
Liquefied petroleum gas/propane gas is heavier than air and will
remain at floor level if there is a leak. Basements, crawl spaces,
closets, and areas below ground level will serve as pockets for
accumulation of leaking gas.
This water heater is supplied with an adjustable thermostat to control
water temperature. Hot water temperatures required for automatic
dishwasher and laundry use can cause scald burns resulting in serious
personal injury and/or death. The temperature at which injury
occurs varies with the person’s age and the time of exposure. The
slower response time of disabled persons increases the hazards to
them. NEVER allow small children to use a hot water tap or to draw
their own bath water. NEVER leave a child or disabled person
unattended in a bathtub or shower.
5
Important Information continued-
WARNING
Installation is not complete unless a pressure and temperature
relief valve is installed into the side of the water heater. See the
Water Connections section of this manual for details.
This water heater contains very hot water under high pressure.
Do not unscrew any pipe fittings or attempt to disconnect any
components of this water heater without positively assuring the
water is cool and has no pressure. Always wear protective
clothing and equipment when installing, starting up, or servicing
this water heater to prevent scald injuries. Do not rely on the
pressure and temperature gauges to determine the temperature
and pressure of the water heater. This water heater contains
components that become very hot. Do not touch any components
unless they are cool.
Improper installation, adjustments, alteration, service or
maintenance can cause property damage, personal injury or loss
of life. Failure to follow all instructions in the proper order can
cause personal injury or death. Read and understand all
instructions, including all those contained in component
manufacturer’s manuals, which are provided with the appliance
before installing, starting-up, operating, maintaining, or
servicing this appliance. Keep this manual and literature in
legible condition and posted near the appliance for reference by
owner and service technician.
This water heater requires regular maintenance and service to
operate safely. Follow the instructions contained in this manual.
Installation, maintenance, and service must be performed only
by an experienced, skilled, and knowledgeable installer or service
agency.
To comply with NSF requirements this water heater is to be:
a) Sealed to the floor with sealant, in a smooth and easily
cleanable way, or
b) Installed with an optional leg kit that includes legs and/or
extensions that provide a minimum clearance of 6”
beneath the water heater.
6
Important Information continued-
WARNING
It is the responsibility of the installing contractor to see that all
controls are correctly installed and are operating properly when
the installation is complete.
DO NOT operate the water heater with jumpered or absent
controls or safety devices.
DO NOT tamper with or alter the water heater and/or controls.
DO NOT operate the water heater if any external part has been
under water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the control
system that was under water.
This water heater is suitable for installation on combustible
flooring. DO NOT install this water heater on carpeting.
DO NOT operate this water heater without first being certain it
is filled with water.
Flammable items, pressurized containers, or any other potential
fire hazardous articles must never be placed on or adjacent to the
heater. Containers of flammable gases should not be stored or
used in the same room with this water heater.
Hydrogen gas can be produced in an operating water heater that
has not had water drawn from the tank for a long period of time
(generally two weeks or more). Hydrogen gas is extremely
flammable. To prevent the possibility of injury under these
conditions, we recommend that the water faucet be opened for
several minutes at the kitchen sink before you use any electrical
appliance that is connected to the hot water system. If hydrogen
is present, there will be unusual sounds such as air escaping
through the pipes as hot water begins to flow. Do not smoke or
have open flame near the faucet at the time it is open.
7
SECTION II
SPECIFICATIONS
Figure 1 – Tank Layout
Table 1: Water Heater Dimension (Inches)
MODEL
A
30-Gal. / Res.
22
40-Gal. “R” / Res.
22
50-Gal. “R” / Res.
22
65-Gal. / Res.
22
65-Gal. / Com.
22
80-Gal. / Res.
24
80-Gal. / Com.
24
120-Gal. / Res.
28-1/4
120-Gal. / Com. 28-1/4
B
C
D
E
F
33-5/8
41-1/8
46-1/4
59-1/4
59-1/4
59
59
62-1/2
62-1/2
28-1/4
34-3/8
40-1/8
53-1/8
53-1/8
52-7/8
52-7/8
55-3/4
55-3/4
34-3/8
41-7/8
47
60
60
59-3/4
59-3/4
63-1/4
63-1/4
5-3/8
5-3/8
5-3/8
5-3/8
5-3/8
5-3/8
5-3/8
6-3/8
6-3/8
27-1/2
27-1/2
27-1/2
27-1/2
47-3/4
27-1/2
47-3/4
28-1/2
48-3/4
8
Specifications continued-
Table 2: Water Heater Capacities
MODEL
Tank
Capacity
(Gal)
Coil
Volume
(Gal)
30-Gal. / Res.
40-Gal. “R” / Res.
50-Gal. “R” / Res.
65-Gal. / Res.
65-Gal. / Com.
80-Gal. / Res.
80-Gal. / Com.
120-Gal. / Res.
120-Gal. / Com.
30
38
48
60
58
75
73
116
114
2.7
2.7
2.7
2.7
5.0
2.7
5.0
2.7
5.0
Dry Weight Wet Weight
(Lbs)
(Lbs)
140
172
180
196
265
224
293
355
415
404
486
576
704
768
861
920
1324
1370
Table 3: AHRI Certified Water Heater Ratings
First Hour
Rating
(Gal/Hr)
MODEL
30-Gal. / Res.
40-Gal. “R” / Res.
50-Gal. “R” / Res.
65-Gal. / Res.
65-Gal. / Com.
80-Gal. / Res.
80-Gal. / Com.
120-Gal. / Res.
120-Gal. / Com.
255
260
265
275
405
295
415
315
445
Standby Minimum Heat
Continuous
Heat Loss Output Rate of
Draw Rating
Rating the Heat Source
(Gal/Hr)
(BTU/Hr)
(°F/Hr)
235
235
235
235
370
235
370
235
370
1.2
1.1
0.9
0.8
0.8
0.6
0.6
0.4
0.4
157,000
157,000
157,000
157,000
245,000
157,000
245,000
157,000
245,000
Minimum
Heat Source
Flow Rate
(Gal/Min)
13.7
13.7
13.7
13.7
14.0
13.7
14.0
13.7
14.0
NOTES: These ratings were obtained with a heat source output rate
and flow rate as specified in Table 3 and a 180°F boiler water supply
temperature. Other results will be obtained under different conditions.
9
Specifications continued-
Table 4: Water Heater Performance
Maximum First
Hour Rating
(Gal/Hr) @
MODEL
140 °F
30-Gal. / Res.
279
288
297
306
534
321
546
357
583
40-Gal. “R” / Res.
50-Gal. “R” / Res.
65-Gal. / Res.
65-Gal. / Com.
80-Gal. / Res.
80-Gal. / Com.
120-Gal. / Res.
120-Gal. / Com.
115 °F
Approximate
Boiler Output
Needed For
Ratings
(BTU/hr)
6.7
6.7
6.7
6.7
12.8
6.7
12.8
6.7
12.8
220,000
220,000
220,000
220,000
420,000
220,000
420,000
220,000
420,000
Continuous
Draw Rating
(Gal/Min) @
115 °F 140 °F
429
438
447
456
820
470
834
507
871
4.2
4.2
4.2
4.2
8.0
4.2
8.0
4.2
8.0
NOTES: Based on 200°F boiler water temperature and 50°F potable
water inlet temperature.
Table 5: Water Heater Performance
MODEL
30-Gal. / Res.
40-Gal. “R” / Res.
50-Gal. “R” / Res.
65-Gal. / Res.
65-Gal. / Com.
80-Gal. / Res.
80-Gal. / Com.
120-Gal. / Res.
120-Gal. / Com.
Hot Water
Availability
(Minutes)
5.5
7.5
9.0
11.0
10.5
13.5
13.2
20.8
20.6
Pressure Drop at
Coil Heat
Rated Heat Source
Transfer Area
Flow Rate
(Sq Ft)
(Feet of Head)
1.5
14.2
1.5
14.2
1.5
14.2
1.5
14.2
5.0
27.2
1.5
14.2
5.0
27.2
1.5
14.2
5.0
27.2
10
Specifications continued-
NOTICE
If the boiler takes longer to heat up from a cold start than the
water availability as noted above, hot water shortage may occur.
Hot water availability is based off drawing 80% of the heated
tank volume at 4 gallons per minute flow rate.
The maximum heat transfer through the coil (heat input) of the
water heater at 240°F boiler water supply temperature and 210°F
potable water temperature is 94,100 Btu/hr for residential models
and 180,300 Btu/hr for commercial models. Potable water
temperature is limited to below 210°F and nominal watercontaining capacity is below 120 gallons for all indirect-fired
models.
Accordingly, per Part HLW-101.2, Section IV of the ASME
Boiler and Pressure Vessel Code, all indirect-fired products
listed are exempted from compliance with the code.
11
SECTION III
GENERAL INFORMATION
FEATURES
This water heater contains the following features:
HEAT EXCHANGER – The heat exchanger (coil) has 1” NPT female
fittings.
These water heaters with single-wall heat exchangers meets the
Uniform Plumbing Code for installation in all potable water systems
provided that:





The boiler water (including additives) is practically non-toxic, having
toxicity rating of class of 1 as listed in Clinical Toxicology of
Commercial Products.
The boiler water pressure is limited to maximum 30 psig by approved
relief valve.
The heat transfer medium is potable water or contains only substances
that are recognized as safe by the U.S. Food and Drug Administration
(FDA).
The pressure of the heat transfer medium is maintained less than the
normal minimum operating pressure of the potable water system.
The equipment is permanently labeled to indicate that only additives
recognized as safe by the FDA shall be used in the heat transfer
medium.
ADJUSTABLE AQUASTAT – The temperature may be adjusted from
80°F to 160°F. The aquastat (thermostat) was adjusted to 120°F before the
heater was shipped from the factory. It is recommended that lower
temperatures be used to avoid the risk of scalding. Refer to the “Warnings”
and the section on SCALDING in “Section VII – Operating Instructions.”
It is further recommended, in all cases, that the water temperature be set for
the lowest temperature that satisfies your hot water needs. This will also
provide the most energy efficient operation of the water heater and
minimizes scale formation.
Setting the water heater temperature at 120°F will reduce the risk of scalds.
Some states require settings to specific lower temperatures.
12
General Information continued-
TEMPERATURE AND PRESSURE RELIEF VALVE
WARNING
Keep clear of the combination temperature and pressure relief valve
discharge line outlet. The discharge may be hot enough to cause scald
injury. The water is under pressure and may splash. 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 of the Standard 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 must 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 must also have an
hourly rated temperature steam BTU discharge capacity not less than the
hourly rating of the water heater. The supplied combination temperature
and pressure relief valve, when properly installed and unrestricted, will
discharge the maximum input produced by a 240°F (115°C) boiler supply
temperature. A lower boiler supply temperature will reduce the input
required to be discharged in the event of excessive potable water
temperatures.
Install the combination temperature and pressure relief valve into the
opening provided and marked for this purpose on the water heater.
Some models may already be equipped or supplied with a temperature
and pressure relief valve. Verify that the combination temperature and
pressure relief valve complies with local codes. If the temperature and
pressure relief valve does not comply with local codes, replace it with one
that does.
13
General Information continued-
WARNING
Install a discharge line so that water discharged from the temperature
and pressure relief valve will exit within six (6) inches above, or any
distance below, the structural floor and cannot contact any live electrical
part. The discharge line is to be installed to allow for complete drainage
of both the temperature and pressure relief valve and the discharge line.
The discharge opening must not be subjected to blockage or freezing.
DO NOT thread, plug, or cap the discharge line. It is recommended
that a minimum clearance of four (4) inches be provided on the side of
the water heater for servicing and maintenance of the combination
temperature and pressure relief valve
Do not place a valve between the combination temperature and
pressure relief valve and the tank!
SACRIFICIAL ANODES – Three sacrificial anode rods have been
installed in the tank head to extend tank life. The anode rods should be
inspected annually to determine the amount of sacrificial decay and replaced
when necessary to prolong tank life. Water conditions in your area will
influence the time interval for inspection and replacement of the anode rod.
The use of a water softener may increase the speed of anode consumption.
More frequent inspection of the anode is needed when using softened (or
phosphate treated) water. Contact the plumbing professional who installed
the water heater or the manufacturer, listed on the rating plate, for anode
replacement information.
14
SECTION IV
PRE-INSTALLATION
UNPACKING
INSPECT SHIPMENT carefully for any signs of damage. If
damage is noted, do not install the product. Contact the shipper or
manufacturer. All equipment is carefully manufactured, inspected,
and packed. Our responsibility ceases upon delivery of the packaged
heater to the carrier in good condition.
NOTE: Any claims for damage or shortage in shipment must be filed
immediately against the carrier by the consignee.
IMPORTANT DECISIONS REQUIRED BEFORE
INSTALLATION
SIZING
1. Boiler DOE Heating Capacity – The indirect-fired water heater will
provide the rated performance only if used in conjunction with a heat
source with a DOE heating capacity (Boiler Output) at least as much
as the minimum noted in Table 3. If the heat source has less capacity,
the output of the tank will be reduced. To determine the approximate
reduction in output from the tank use the following formula:
New Rating = (maximum continuous draw rating) x
Actual Boiler Output Capacity
Minimum Boiler Output Capacity
For example, what would the continuous draw rating be if a 50-gallon
indirect-fired heater were installed with a heat source having a DOE
heating capacity of 125,000 BTU/h?
Answer:
New Rating
= 235 gal/hr x (125,000 BTU/h)/(157,000 BTU/h)
= 235 gal/hr x 0.796 = 187 gal/hr
15
Pre-installation continued-
NOTICE
Increasing the boiler DOE heating capacity above the values listed
in Table 3 will not increase the rating of the water heater.
2. Circulator Sizing – Refer to Table 5 for the corresponding
pressure drop through the coil for the given model. Calculate the
pressure drop of all straight pipe and fittings on the supply and
return of the water heater at the selected flow rate. Add the
piping/fitting pressure drop to the pressure drop through the water
heater coil.
Select a circulator that will provide an appropriate flow rate at the
combined pressure drop.
SYSTEM ZONE CONTROL
The indirect-fired water heater must be installed as a zone separate
from the space heating system. The domestic hot water zone’s piping
and circulator must be sized for a minimum flow rate with all zones
in use and a maximum flow rate with only the water heater in use.
For this reason, the preferred method of zone control is with
circulators.
1. Circulators – With space heating zones using circulators, the
indirect-fired heater should be added as an additional zone with a
circulator.
2. Zone Valves – Select a valve with a low-pressure drop to assure
adequate flow through the water heater.
3. Hybrid – The space heating zone can be zoned using zone valves
and the indirect-fired heater zoned with a circulator.
16
Pre-installation continued-
DOMESTIC HOT WATER PRIORITY
Two options are available, Priority and Non-Priority.
1. Priority – Demand for space heating is interrupted or postponed
until the domestic hot water demand is satisfied. This option
provides maximum delivery of domestic hot water. Priority is
recommended when:
a) Boiler net output is 100,000 Btu per hour or less, or
b) When boiler output required to satisfy domestic hot water
demand is at least 50% of the boiler output required to satisfy
space heating demand, or
c) When an interruption in space heating can be tolerated during a
long domestic hot water draw.
2. Non-Priority – Boiler output is divided between space heating
and domestic hot water heating. Delivery of domestic hot water
can be reduced during simultaneous space and domestic hot water
heating operations, depending on such factors as boiler output,
boiler over-sizing, number of space heating zones calling for heat,
and the ratio of domestic hot water load to space heating load.
17
Pre-installation continued-
Component Location
CAUTION
This water heater must be located in an area where leakage of the tank,
water line connections, or the temperature and pressure relief valve
will not result in damage to the area adjacent to the water heater or to
lower floors of the structure. When such locations cannot be avoided,
a suitable drain pan must be installed under the water heater. The
drain pan depth must be suitable for draining and collecting water, and
have a minimum length and width of at least four (4) inches measured
from the jacket of the water heater. The drain pan, as described above,
can be purchased from your plumbing professional. The drain pan
must be piped to an adequate drain. The piping must be at least ¾ inch
in diameter and pitched for proper drainage.
Clearance from Combustible Materials
Top
Sides
Front
Rear
0”
0”
0”
0”
Table 6: Combustible Material Clearances
Recommended Service Clearances
Non-Piping
Side
4”
Front
T & P Relief
(Aquastat)
Rear
Valve Side
16”
0”
4”
Table 7: Service Clearances
CAUTION
Do not drop water heater. Do not bump water heater jacket against
floor.
18
Pre-installation continued-
Appliance Location
1. Boiler Location – Locate the indirect-fired water heater as close
to the boiler as practical.
2. Fixture Locations – For fastest delivery of hot water, place the
indirect-fired water heater close to points of use.
Additional Recommended Components
1. Shut-off Valves – Allows isolation of water heater from
domestic water system and/or boiler system during service.
2. Unions – Allows water heater movement during service if
adequate clearance cannot be provided.
3. Thermal Expansion Tank – If the water heater is installed in a
closed water supply system, such as one having a back-flow
preventer in the cold water line, provide thermal expansion
control. Contact the water supplier or local plumbing inspector
for additional information.
WARNING
Do not plug the inlet and outlet tappings of tankless heater left
installed in the boiler.
MOVE THE WATER HEATER TO A PERMANENT
POSITION BY SLIDING OR WALKING.
NOTICE
For California installation this water heater must be braced, anchored,
or strapped to avoid falling or moving during an earthquake. See
instructions for correct installation procedures. Instructions may be
obtained from DSA Headquarters Office, 1102 Q Street, Suite 5100,
Sacramento, California 95811.
19
SECTION V
WATER CONNECTIONS
WARNING
FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED
TEMPERATURE AND PRESSURE RELIEF VALVE WILL
RELEASE THE MANUFACTURER FROM ANY CLAIM WHICH
MIGHT RESULT FROM EXCESSIVE TEMPERATURE AND
PRESSURES.
Hydrogen gas can be produced in an operating water heater that has
not had water drawn from the tank for a long period of time.
HYDROGEN GAS IS EXTREMELY FLAMMABLE. To prevent
the possibility of injury under these conditions, we recommend the
hot water faucet be opened for several minutes at the kitchen sink
before you use any electrical appliance that is connected to the hot
water system. If hydrogen is present, there will be an unusual sound
such as air escaping through the pipes as hot water begins to flow.
Do not smoke or have open flame near the faucet at the time it is
open.
Keep clear of the temperature and pressure relief valve discharge line
outlet. The discharge may be hot enough to cause scald injury. The
water is under pressure and may splash.
CAUTION
If sweat fittings are to be used, DO NOT apply heat to the nipples on
top of the water heater. Sweat the tubing to the adapter before fitting
the adapter to the water connections. It is imperative that heat is not
applied to the nipples containing a plastic liner.
20
Water Connections continued-
INSTALL TEMPERATURE AND PRESSURE RELIEF VALVE
(if not factory installed)
WARNING
Temperature and pressure relief valve discharge piping must be piped near
the floor to eliminate potential of severe burns. Do not pipe in any area
where freezing could occur. Do not install any shut-off valves, plugs or
caps to the temperature and pressure relief valve or piping.
INSTRUCTIONS FOR POTABLE CONNECTIONS
1. BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE
THE MAIN WATER SUPPLY VALVE. After shutting off the
main water supply, open a faucet to relieve the water line pressure
to prevent any water from leaking out of the pipes while making
the water connections to the water heater. After the pressure has
been relieved, close the faucet. The COLD water inlet and HOT
water outlet are identified on the top of the water heater. Make
the proper plumbing connections between the water heater and the
plumbing system to the house. Install a shut-off valve in the cold
water supply line.
2. If this water heater is installed in a closed water supply system,
such as one having a back-flow preventer in the cold water
supply, provisions must be made to control thermal expansion.
DO NOT operate this water heater in a closed system without
provisions for controlling thermal expansion. Warranties do not
cover damages from thermal expansions such as pressure bulges
and/or deformities. A properly sized expansion tank will alleviate
most problems. Your water supplier or local plumbing inspector
should be contacted on how to control this situation.
3. After installation of the water lines, open the main water supply
valve and fill the water heater. While the water heater is filling,
open several hot water faucets to allow air to escape from the
water system. When steady streams of water flow through the
faucets, close them and check all water connections for possible
leaks.
21
Water Connections continued-
4. NEVER OPERATE THE WATER HEATER WITHOUT
FIRST BEING CERTAIN THAT IT IS FILLED WITH
WATER.
INSTRUCTIONS FOR BOILER CONNECTIONS
The indirect-fired heater connection labeled “To Boiler Return” should
be piped to the boiler return piping as close to the boiler as possible
and especially after any flow control or check valves in the space
heating return piping. The use of a union and a shut-off valve is
recommended. The use of a flow control or check valve is required to
prevent back flow through the water heater during operation of the
space heating system. Pipe and fittings between the boiler and
indirect-fired water heater should be ¾” diameter or larger.
CONNECT WATER BOILER SUPPLY PIPING
1. For a space heating system that utilizes ZONE VALVES, refer to
Figure 2. The indirect-fired water heater connection labeled
“FROM BOILER SUPPLY” should be piped to the boiler supply
piping. Mount the circulator making sure the flow arrow points
toward the water heater. The use of shut-off valves and unions are
recommended for future service convenience. The use of an air
separator and vent is recommended to eliminate air in the system.
Pipe and fittings between the boiler and indirect-fired water heater
must be ¾” diameter or larger.
CAUTION
Maximum boiler water supply temperature to the indirect
heat exchanger must not exceed 240°F (116°C).
22
Water Connections continued-
Figure 2 - Water Boiler Piping with Zone Valves
2. For a space heating system that utilizes CIRCULATORS, refer to
Figure 3. The indirect-fired water heater connection labeled
“FROM BOILER SUPPLY” should be piped to the boiler supply
piping. Mount the circulator making sure the flow arrow points
toward the water heater. The use of shut-off valves and unions are
recommended for future service convenience. The use of an air
separator and vent is recommended to eliminate air in the system.
Pipe and fittings between the boiler and indirect-fired water heater
must be ¾” diameter or larger.
Figure 3 - Water Boiler Piping with Circulators
23
Water Connections continued-
CONNECT STEAM BOILER SUPPLY PIPING
Figure 4 represents a typical steam boiler connection diagram. Refer
to the boiler installation manual or contact the boiler manufacturer for
an appropriate piping diagram. The use of a union, shut-off valves,
and a drain valve is recommended for future service convenience.
The use of an in-line “Y”-style strainer is required to prevent
accumulation of sludge in the water heater’s coil.
Figure 4 - Typical Steam Boiler Connections (connections available below
the water line)
NOTICE
Typical steam boiler without connections available below the water line is
not recommended due to insufficient water temperature, especially during
warmer months when the space heating system is not operational. Boiler
water temperature at the bottom of a steam boiler can be 50°F lower than
the boiler’s water temperature limit setting during such periods.
FILL BOILER SYSTEM
1. On new boiler installations, do not purge the boiler or space
heating system through the water heater. During any boiler or
space heating system flushing, cleaning, or purging, the water
heater should be isolated to avoid possible attack on the carbon
steel coil by chemical additives.
2. Purge air from boiler/water heater piping.
3. Check system for leaks. Repair as necessary.
24
SECTION VI
ELECTRICAL CONNECTIONS
Install electric wiring in accordance with National Electric Code or
the Canadian Electrical Code and local regulations. See the boiler’s
installation manual for wiring diagrams.
DANGER
Positively assure all electrical connections are unpowered before
attempting installation or service of electrical components or connections
of the water heater or building. Lock out all electrical boxes with padlock
once power is turned off.
WARNING
When installed, the water heater must be electrically grounded in
accordance with local codes or, in the absence of local codes, with the
National Electrical Code, ANSI/NFPA 70, and /or the CSA C22.1
Electric Code.
Failure to properly wire electrical connections to the water heater may
result in serious physical harm.
Electrical power may be from more than one source. Make sure all
power is off before attempting any electrical work.
This indirect-fired water heater is supplied with an aquastat
temperature control. This aquastat must be installed in the aquastat
well location of the water heater. Refer to Figure 5. Remove the
cover and loosen the clamping screws. Insert the aquastat capillary
bulb to the well bottom as shown and screw the aquastat clamp
securely in the well groove. The aquastat acts as a thermostat for
zone control and should be wired accordingly. Refer to the boiler or
zone control manufacturer’s instructions if any additional wiring is
required. The control is factory set at 120°F and care should be made
to not rotate this dial while wiring the control. Once electrical
connections are complete, secure the aquastat cover back in place.
AT NO TIME SHOULD WATER HEATER OPERATION
TAKE PLACE WITHOUT THE COVER ON THE CONTROL.
25
Electrical Connections continued-
Figure 5 - Aquastat Control
SECTION VII
OPERATING INSTRUCTIONS
WARNING
Water heaters are heat-producing appliances. To avoid damage or injury
there must be no materials stored against the water heater, and proper care
must be taken to avoid unnecessary contact (especially by children) with
the water heater.
UNDER NO CIRCUMSTANCES SHALL FLAMMABLE MATERIALS,
SUCH AS GASOLINE OR PAINT THINNER BE USED OR STORED
IN THE VICINITY OF THE WATER HEATER OR IN ANY
LOCATION FROM WHICH FUMES COULD REACH THE WATER
HEATER.
Installation or service of this water heater requires ability equivalent
to that of a licensed tradesman in the field involved. Plumbing and
electrical work are required.
26
Electrical Connections continued-
SYSTEM START-UP
Follow boiler installation instructions to place boiler in operation.
SEQUENCE OF OPERATIONS
1. Aquastat senses stored water temperature drops below desired
setting.
a. Domestic hot water priority only: Normally closed contacts
open to interrupt space heating.
2. Aquastat satisfied.
a. Aquastat contacts open, turning off domestic hot water
circulator and de-energizing relay.
b. Normally open contacts open, stopping boiler operation.
c. Domestic hot water priority only: Normally closed contacts
close, returning boiler control to space heating.
WATER TEMPERATURE ADJUSTMENT
1. The aquastat controls the maximum water temperature in the tank.
The differential is variable 5 to 30°F with a 160°F maximum
setting, set at the factory to a 5°F differential and 120°F
temperature.
WARNING
SCALDING
This water heater can deliver scalding temperature water at any
faucet in the system. Be careful whenever using hot water to avoid
scalding injury. By setting the aquastat on this water heater to
obtain an increased water temperature, you may create the potential
for scald injury. To protect against injury, you should install an
ASSE approved mixing valve (a device to limit the temperature of
water to protect against scald injury via mixing hot and cold water
supply) in the water system. This valve will reduce point of
discharge temperature in branch supply lines. Such valves are
available from the manufacturer of this water heater or a local
plumbing supplier. Please consult with a plumbing professional.
27
Electrical Connections continued-
Table 8 details the approximate 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.
Water temperature over 125°F
can cause severe burns
instantly or death from scalds.
Children, disabled and elderly
are at highest risk of being
scalded.
Review this instruction manual
before setting temperature
at water heater.
Feel water before bathing or
showering.
Temperature limiting valves are
available.
Figure 6 - Scald Warning
APPROXIMATE
TIME/TEMPERATURE
RELATIONSHIPS IN SCALDS
120°F
More than 5 minutes
125°F
1 ½ 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 ½ seconds
155°F
About 1 second
Table 8: Scald Relationships
2. For the most energy efficient operation, adjust the aquastat for the
minimum water temperature necessary to meet domestic hot water
needs. Refer to Figure 7. Use a small flat screwdriver to rotate
the temperature dial through the hole directly below the
temperature indication window. The temperature setting is
aligned with the notch in this window. IT IS NOT
NECESSARY TO REMOVE THE COVER TO ADJUST
THE TEMPERATURE SETTING. THE AQUASTAT
COVER SHOULD NEVER BE REMOVED WITHOUT
ELECTRICITY BEING FIRST DISCONNECTED.
Figure 7 - Aquastat Control
28
Electrical Connections continued-
3. After the water heater completes a heat-up cycle, check the water
temperature at a faucet. Allow enough water to flow to ensure
that the water temperature reflects the tank temperature. Adjust
the water heater’s temperature setting as necessary.
a. Adjusting to a lower temperature setting will not immediately
affect water temperature. Draw sufficient water or allow the
water heater to remain idle until a heat-up cycle is initiated.
Repeat step 3.
b. Adjusting to a higher temperature may not immediately affect
water temperature. If a heat-up cycle begins, return to step 3.
If a heat-up cycle does not begin, draw sufficient water or
allow the water heater to remain idle until a heat-up cycle is
initiated. Repeat step 3.
SECTION VIII
MAINTENANCE
This indirect-fired water heater is intended to provide a service life of
many years. Components that require service, however, may be
subject to failure. Failure to use the correct procedures or parts in
these circumstances may make the water heater unsafe.
The owner should arrange to have the following inspections and
simple maintenance procedure performed by qualified service
personnel at the frequencies suggested.
1. Boiler and Domestic Water Piping (Annual) – Check all piping for
signs of leakage at joints, unions, and shut-off valves. Repair as
needed.
2. Temperature-Pressure Relief Valve (Annual) – The temperaturepressure relief valve should be checked to ensure that it is in
operating condition. To check the relief valve, lift the lever at the
end of the valve several times. The valve should seat properly and
operate freely. If water does not flow, remove and inspect for
obstructions or corrosion. Replace with a new valve of the
recommended size as necessary. Do not attempt to repair the valve,
as this could result in improper operation and a tank explosion. In
areas with poor water conditions, it may be necessary to inspect the
temperature-pressure relief valve more often than once a year.
29
Maintenance continued-
CAUTION
Before manually operating the valve, make sure that a drain line
has been attached to the valve to direct the discharge to an open
drain. Failure to take this precaution could mean contact with
extremely hot water discharging from the valve during this
checking operation.
3.
If the temperature–pressure relief valve on the heater discharges
periodically or continuously, it may be due to thermal expansion
of water in a closed water supply system, or it may be due to a
faulty relief valve.
Thermal expansion is the normal response of water when it is
heated. In a closed system, thermal expansion will cause the
system pressure to build until the relief valve actuation pressure is
equaled. Then the relief valve will open, allowing some water to
escape, slightly lowering the pressure. Contact your water
supplier or local plumbing inspector on how to control this
situation.
ABOVE ALL, DO NOT PLUG THE TEMPERATURE AND
PRESSURE RELIEF VALVE. THIS IS NOT A SOLUTION
AND CAN CREATE A HAZARDOUS SITUATION.
Anode Inspection and Replacement – This water heater is
equipped with multiple sacrificial anodes. Anodes protect the
glass-lined tank from corrosion by sacrificing themselves through
electrolysis. When the anode material is consumed, there is no
more protection and corrosion of the tank accelerates.
Inspection of the anode every year allows you to identify a spent
anode and replace. Replace the anode when its diameter is 3/8 of
an inch, or every other year, which ever is first. Aggressive, very
hot and softened water causes rapid consumption of the anode,
requiring frequent inspections. Anodes are available from your
distributor or from the manufacturer.
To inspect or replace an anode:
The anodes on this water heater are easily accessible from the top
of the heater making replacement simple and quick.
30
Maintenance continued-
a. Turn the water heater electricity off for the zone containing the
indirect-fired heater. Flow water until the discharge is cool or
allow enough time for the potable water to cool naturally.
Connect a hose to the drain valve. Locate the hose’s discharge
in an area where any remaining hot water will not cause any
damage or injury.
b. Open the drain valve to flush any sediment out of the bottom to
the heater.
c. Shut off the cold water supply. Make sure all hot water fixtures
and circulating pumps are turned off.
d. Wait for water flow from the hose to stop. Remove the anode
using a socket of the appropriate size. Do not use an impact
wrench.
e. Inspect and replace the anode as required. Use pipe tape or
sealant when reinstalling the anode.
f. Close the drain valve. Open a hot water fixture to allow air to
escape. Open the cold water supply to the heater and allow the
tank to fill.
g. Check your anode and drain valve for leaks.
h. Turn the water heater electricity on for the zone containing the
indirect-fired heater.
4. Sediment (Annual, but harsh water quality may dictate more
frequent service) – Depending on water conditions, a varying
amount of sediment may collect in the tank. Levels requiring
service are indicated by a small temperature difference in the supply
and return lines (See also “Scale” below). Repeated flushing
usually clears such material. As a preventive measure, water should
be drawn from the tank at the drain valve until it runs clear.
5. Scale (Annual) – Hard water may cause scale to build-up on the
outside of the heat exchanger coil. A water softener will prevent
this problem (See also “Sediment” above). Symptoms would be
reduced recovery capacity or reduced temperature differential
between boiler supply and return lines. Repeated flushing should
resolve the problem.
31
SECTION IX
TROUBLE SHOOTING GUIDE
PROBLEM
No hot water at
faucet
CAUSE
Boiler does not
operate
Circulator does
not operate
Improper aquastat
setting or
calibration
Zone valve does
not open (if used)
Electrical problem
(relay, wiring,
etc.)
Scale build-up
Clogged cold
water filter or
boiler supply
strainer (if used)
32
SOLUTION
Refer to boiler installation
instructions
Check main service
switch
Check fused disconnect
Check power supply
Replace as necessary
Turn tank aquastat to
appropriate setting
Check power supply
Replace as necessary
Check fuse and replace
Check circuit breaker and
reset (if applicable)
Check power supply
If boiler, circulator, and
tank are operating
satisfactorily, coil may
have scale coating. See
Section VIII:
Maintenance
Clean or replace filter or
strainer
Trouble Shooting Guide continued-
PROBLEM
Water at faucet
too hot
CAUSE
Aquastat set too
high
Improper system
plumbing
Improper system
wiring
Insufficient hot
water
Boiler cycles
more than 5
times per day
in summer
Aquastat setting
too low
Undersized boiler
with no priority to
domestic hot water
Peak use of hot
water is greater
than tank storage
capacity
Faulty tank
aquastat
Excessive demand
SOLUTION
Lower aquastat setting.
See Section VII
Compare plumbing to
Section V: Water
Connections
Compare wiring to
Section VI: Electrical
Connections
Adjust aquastat to higher
setting. See Section VII
Rewire for priority
Determine peak usage
and compare to tank
capacity
Replace aquastat
Reduce demand or
consider larger tank
Faulty aquastat
Replace aquastat
Boiler high limit
set too low
Increase boiler high limit
setting
33
SECTION X
PARTS LIST
PART NAME & DESCRIPTION
1. Aquastat Control
7. Drain Valve
2. Aquastat Well
8. Jacket Head Pan
3. Anode
9. Hole Closure
4. Diptube
10. Heat Exchanger Escutcheon
5. Outlet Nipple
11. Drain Escutcheon
6. T&P Relief Valve
12. Control Escutcheon
34
Contact your supplier or plumbing professional for replacement parts
or contact the company at the address given on the rating plate of the
water heater.
Provide the part name, model, and serial numbers of the water heater
when ordering parts.
READ THE WARRANTY FOR A FULL EXPLANATION OF THE LENGTH
OF TIME THAT PARTS AND THE WATER HEATER ARE WARRANTED.
Manufactured under one or more of the following U.S. Patents: RE.34,534;
B1 5,341,770; 4,416,222; 4,628,184; 4,669,448; 4,672,919; 4,808,356; 4,829,983;
4,861,968; 4,904,428; 5,000,893; 5,023,031; 5,052,346; 5,081,696; 5,092,519;
5,115,767; 5,199,385; 5,277,171; 5,372,185; 5,485,879; 5,574,822; 5,596,952;
5,660,165; 5,682,666; 5,761,379; 5,943,984; 5,954,492; 5,988,117; 6,142,216;
6,395,280; 6,684,821; 7,007,748; 7,063,132
Other U.S. and Foreign patent applications pending. Current Canadian Patents:
1,272,914; 1,280,043; 1,289,832; 2,045,862; 2,092,105; 2,107,012; 2,108,186;
2,112,515
Complete the following information and retain for future reference:
Model No:______________________________________________
Serial No: ______________________________________________
Service Phone
Days: ___________________ Nights: ______________________
Address: _______________________________________________
Supplier: _______________________________________________
Supplier Phone No: ______________________________________
35
NOTES
36
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