American Standard Standard Residential Manual

Operating, installation
and service manual
Standard Residential power vent
Gas Water Heater with vaporshield Technology.
WARNING: If the information in these instructions is not followed exactly, a re or
explosion may result causing property damage, personal injury or death.
Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this
or any other appliance.
WHAT TO DO IF YOU SMELL GAS
1. Do not try to light any appliance.
2. Do not touch any electrical switch; do not use any
phone in your building.
3. Immediately call your gas supplier from a neighbor´s phone.
Follow the gas supplier´s instructions.
4. If you can not reach your gas supplier, call the re department.
Installation and service must be performed by a qualifed installer, service agency or the
gas supplier.
THIS WATER HEATER SHALL NOT BE INSTALLED IN BATHROOMS, BED-
ROOMS, OR ANY OCCUPIED ROOM NORMALLY KEPT CLOSED.
VAPORSHIELD® Technology Gas Water Heatersmeet the new ANSI Z21.10.1
standard that deals with the accidental or unintended ignition of ammable vapors,
such as those emitted by gasoline.
WARNING: This water heater is equipped for one type of gas only. Check
the data plate near the gas control valve for the correct gas. DO NOT USE THIS
WATER HEATER WITH ANY GAS OTHER THAN THE ONE LISTED ON THE
DATA PLATE. Failure to use the correct gas can cause problems which can result
in DEATH, SERIOUS BODILY INJURY OR PROPERTY DAMAGE. If you have any
questions or doubts consult your gas supplier or gas company. Water heaters for
bottled, propane or liqueed petroleum gas (LPG) are different from natural gas
models. A natural gas heater will not function safely on bottled, propane or lique-
ed petrolum gas (LPG) and no attempt should be made to convert a heater from
natural gas to any other gas.
INSTALLER:
1. Afx these instructions or adjacent to water heater.
2. Before leaving premises: REVIEW this operation,
installation and service manual to be sure heater has been installed correctly.
Make sure unit is started and operated for one complete cycle and water
temperature is acceptable to he costumer at the xtures.
OWNER:
1. Retain these instructions and warranty for future
reference.
All technical and warranty questions should be directed to the local dealer from
whom the water heater was purchased. If you are unsuccessful please write to
the company listed on the warranty or data plate which came with your water
heater.
CALL THIS TOLL FREE NUMBER 1-888-883-0788
WITH ANY QUESTIONS DURING OR AFTER INSTALLATION.
HAVE YOUR MODEL AND SERIAL NUMBER AVAILABLE BEFORE
CALLING.
1120287 - REV. AUG 19

GENERAL SAFETY
Read and undestand instruction
manual and safety message
before installing, operating or
servicing this water heater.
Failure to follow instructions and
safety messages could result in
death or serious injury.
Instruction manual must remain
with water heater.
For continued proctection
against risk or re:
• Do not install water heater on
carpeted oor.
• Do not operate water heater if
ood damage.
•Overheated water can cause
water tank explosion.
• Properly sized temperature
and pressure relief valve
must be installed in opening
provided.
• Do not operate water heater if ood damaged.
• Inspect and replace anode.
• Install in location with drainage.
• Fill tank with water before operation.
•Be alert for thermal expansion.
Refer to instruction manual for installation and service.
Water temperature over 125ºF
(52ºC) can cause severe burns
instantly resulting in severe injury
or
death.
Children, the elderly, and the
physycally or mentally disabled are
at highest risk for scald injury.
Feel water before bathing or
showering .
Temperature limiting, valves are
available.
Read instruction manual for safe
temperature setting.
•Do not store or use gasoline or other ammable vapors
and liquids in the vicinity of this or any other appliance.
•Avoid all ignition source if you smell gas.
•Do not expose water heater control to excessive gas
pressure.
•Use only gas shown on rating plate.
•Maintain required clearances to combustibles.
•Keep ingnition sources away from faucets after extended
period of non-use.
Read instruction manual before
installing, using or servicing
water heater.

TABLE OF CONTENTS
General safety A
Table of contents, installation information B
Consumer responsibilities 1
Location clearances from combustible construction 2
Typical Installation 3
Air supply, all air from inside the building, all air from
Outside the building 4, 5
Mechanical exhausting and replaces 5
Venting, water piping, caution operating an empty or
partially lled water, closed water systems 6
Temperature and pressure relief valve 7
Space heating / potable water system 7, 8
Termination clearances sidewall 9
Blower assembly Installation 10, 11
Installation vent system 11 to 19
Installation check list 20
Solar Installation, insulation blanket 21
Safety instructions, lighting instructions 22
Gas supply, gas piping installation, pressure warning 23
Removing and replacing the gas control valve/thermostat 24
Replacing the high temperature cut off switch assembly 25
Hot surface replacement instructions 25
Burner maintenance/replacement 26
Draining and ushing interior of tank
Venting system inspection, tampering 27
Emergency shutdown, condensation, smoke/odor,
L.P. and natural units models, out of fuel 28
Hydrogen gas, exposure to water, anode,
Water heater sounds, tampering 29
Qualied service persons 30
Trouble shooting check list 31, 32, 33
Resetting the heater control, lockouts 34
Ignition state and timing, system status and error codes 35
Reading the LED ash sequence 36, 37
Repair parts illustration 38
Ordering parts and service 39
IMPROPER INSTALLATION,
ADJUSTMENT,ALTERATION,
SERVICE OR MAINTENANCE
CAN CAUSE INJURY, DEATH OR
PROPERTY DAMAGE READ AND
REFER TO THIS MANUAL.
Please complete the following information at the time of installation. This should be retained and
presented along with the warranty in the event a claim is necessary.
MODEL NUMBER: TYPE OF GAS:
SERIAL NUMBER:
INSTALLATION ADDRESS:
DATE OF INSTALLATION:
THIS WATER HEATER HAS BEEN INSTALLED IN ACCORDANCE WITH THESE INSTALLATION
INSTRUCTIONS AND LOCAL CODE REQUIREMENTS ON
INSTALLER:

1
Under no circunstances is the manifacturer to be held liable for any water damage in connection with this water heater.
CONSUMER RESPONSIBILITIES
THIS MANUAL HAS BEEN PREPARED TO ACQUAINTYOU WITH THE INSTALLATION, OPERATION AND
MAINTENANCE OF YOUR GAS WATER HEATER AND TO PROVIDE IMPORTANT SAFETY INFORMATION.
WE URGE YOU TO READ ALL INSTRUCTIONS THOROUGHLY before attempting installation or operation of
your water heater. Keep these instructions for future reference.
The manufacturer of this water heater will not ne liable for any damages caused by failure to comply with the installation and
operating instructions outlined on the following pages. These instructions are a guide for the correct installation of your water
heater. If you lack the necessary skills required or have difculty following the directions, you should not proceed but get help
from a qualied person for that part of the installation you do not understand. Failure to follow this warning can result in an
incorrect installation that can result in DEATH, INJURY OR PROPERTY DAMAGE.
This water heater is design-certied by CSA International as a power vent water heater, which takes
it’s combustion air, either from the installation area or from air ducted to the unit from outside.
This water heater must be installed according to all local and state codes, or in the absence of local and state codes, the “
National Fuel Gas Code”,ANSI Z223.1 (NFPA 54)-Latest Edition. This code is available from the following:
Important WARNINGS: Do not use this appliance if any part has been under water.
Immediately call a qualied service technician.. Water heaters subjected to ood conditions,
or anytime the gas controls, main burner or pilot have been submerged in water, require replacement
of the entire water heater.
American Gas Association
400 North Capitol, St; NVV
Washington D.C. 20001-0000
E mail AGA.org
National Fire Protection Agency
1 Batterymarch Park
Quincy, MA 02269
Check your local phone listings for the local authorities having
jurisdiction over your instalation.
• This water heater may not be installed in a mobile home.
• Location selection should be as close to the stack or chimney as
practical and as centralized with the piping system as possible.
• Water heater should be located in an area not subject to freezing
temperatures.
• The water heater should be located so that the controls and
drain are easily accessible (at least 24 inches of open space of the
water heater).
•
• A suitable drain pan must be installed under the heater.
• Remove exterior packaging and place installation
components aside.
• Inspect all parts for damage prior to installation
and startup.
• Completely read all instructions before
attempting to assemble and install this product.
When referring to your water heater always have the
information listed on the rating plate readily available.
WARNING
WARNING
UNPACKING THE Water Heater
Such pans must have a minimum length and width of at least two
inches greater than the diameter of the heater, and must be piped
to an adequate drain. The pan must not restrict combustion air ow.
(Figure 1)
LOCATION
Use two or more people to move and install water heater,
unless proper handling equipment is utilized. Failure to do so
can result in back or other injury.
Important: Do not remove any permanent instructions, labels,
or the data label from outside of the water heater or on the
inside of panels.

2
When this heater is installed directly on caepeting, carpeting
must be protected by a metal or wood panel beneath the
appliance extending beyond the full width, and depth if the
appliance is installed in an alcove or closet, the entire oor
must be covered by the panel.
FAILURE TO HEED THIS WARNING MAY RESULT IN FIRE
HAZARD.
Minimum clearances between the water heater and
combustible construction are 0” at the sides and rear, 6”
at the front, and 6” from the vent pipe. Clearance from the
top of the jacket is 12” on most models, refer to the label
attached adjacent to the gas control valve on the water
heater. When 12” top clearance is used, a minimum of 6”
must be provided between the pipe and the ceiling if an
elbow is used on the draft hood.
Figure 2: This may be used as reference guide to locate the specic clearance
locations. A minimum of 24 inches front clearance should provide for inspection
and serving.
RESIDENTIAL AREA WHICH MAY NOT BE SUITABLE
FOR HEATER INSTALLATION would include those areas
where ammable liquids (such as gasoline, solvents, liquied propane
or butane, etc.) or other substances (such as adhesive, etc.) all of
which emit ammable vapors, may be improperly are stored
or used. Because of natural air movement in a room or other
enclosed space, ammable vapors can be carried some distance
from where their liquids are being used or stored.
The gas water heater hot surface pilot or main burner ame can
ignite such vapors. The resulting ash-back and re can cause
death or serious burns to anyone in the area as well as property
damage. Even though this water is ammable vectors
ignition resistant water heater and is designed to reduce
the chances of ammable vapors being ignited, gasoline and
other ammable sustances should never be stored or used
in the same vicinity or area containing or gas water heater
or other ammable or spark producing appliance.
Do not locate the water heater, near an air moving device.
The operation of air moving devices such as exhaust fans,
ventilation system, clothes dryers, replaces, etc., can affect
the proper operation of the water heater. Special attention
must be given to condition these devices may create. Low
reversal of ue gases may cause an increase of carbon
monoxide inside of the dwelling.
This water heater, like all gas appliances will perform better
if dirt and debris are prevented from accumulating on the
oor in front of the water heater where dust and lint can
be drawn into the burner.
A water heater cannot operate properly without the
correct amount of air for combustion. Do not install in
a conned area such as closet, unless you provide air as
shown in Figure 6. Never obstruct the ow of ventilation
air. If you have any doubts oe question at all, call your
gas supplier. Failure to provide the proper amount of
combustion air can result in a re or explotion and cause
death, serious bodily injury, or property damage.
Follow all the local and state codes. Or, in the absence of
local and state codes, the “National Fuel Gas Code”, ANSI
Z223. 1 (NFPA 54)- latest edition to properly install the
system.
Failure to do so can result in death, solution, or carbon
monoxide poisoning.
THIS MANUAL HAS BEEN PREPARED TO
ACQUAINT YOU WITH THE INSTALLATION,
OPERATION AND MAINTENANCE OF YOUR GAS
WATER HEATER AND TO PROVIDE IMPORTANT.
WARNING
WARNING
FIGURE 3:
Typical installation in
residencial garages.
(Drawing copyright
by the American Gas
Association. Used
by permission of the
copyright holder).
• Install water heater in accordance
with the instruction manual and
NFPA54.
• To avoid injury, combustion and
ventilation air must be taken from
outdoors.
• Do not place chemical vapor emit-
ing products near water heater.
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.

3
TYPICAL INSTALLATION
HOT OUTLET WATER
CLOSED WATER
SYSTEM
EXPANSION
TANK PRESSURE REDUCING
VALVE WITH BYPASS
COLD WATER
INLET
COLD
WATER
INLET
VALVE
TEMPERATURE AND PRESSURE RELIEF VALVE
**SOME MODELS MAY HAVE TEMPERATURE & PRESSURE RELIEF
VALVE TAPPING ON TOP OF HEATER
DATA PLATE AND LIGHTING
INSTRUCTION LOCATION
GAS CONTROL VALVE (THERMOSTAT)
DISCHARGE LINE (EXTEND TO AN OPEN DRAIN)
IT MUST BE AT LEAST 3/4” IN AND PITCHED FOR PROPER
DRAINAGE TO AN OPEN DRAIN. DO NOT THREAD, CAP
OR PLUG THE END
AIR GAT 6” MINIMUM
CAP
DRIP LEG (SEDIMENT TRAP)
MINIMUM LENGHT 3”
DRAIN LINE
SHOULD BEAT LEAST 3/4” IN AND
PITCHED FOR PROPER DRAINAGE
TO AN OPEN DRAIN
DRAIN PAN MUST
LIMIT WATER
ACCUMULATION
TO A MAXIMUM
HEIGHT OF 1 3/4”
COLD
TEMPERED
WATER
(TO FIXTURES)
TEMEPRING
VALVE
(SET TO 120ºF)
FOLLOW THE TEMPERING VALVE
MANUFACTURER’S INSTRUCTION
FIGURE 4
State of California Note:
The water heater must be braced, anchored,
or strapped to avoid moving during an earth-
quake.
Contact local utilities for code requirement
in your area or call 1-888-883-0788 and
request instructions.
PIPING MUST MEET ALL LOCAL CODE REQUIREMENTS.
NOTE: Water heater must be installed level.

4
Important air for combustion and ventilation must not come from a
corrosive atmosphere. Any failure due to corrosive elements in the
atmosphere is exclude from warranty coverage.
The following types of installation (not limited to the following) will require
outdoor air for combustion due to chemical exposure and may reduce
but not eliminate the presence of corrosive chemicals in the air.
• Beauty shops.
• Photo processing labs.
• Buildings with indoor pools.
• Water heaters installed in laundry, lobby, or craft rooms.
• Water heaters installed in chemical storage areas.
Combustion air must be free of acid-forming chemicals such as
sulfur, uorinem chlorine. These elements are found in aerosol sprays,
detergents, bleaches, cleaning solvents, air fresheners, paint and varnish
removers, refrigerants, and many other commercial or household
products. When burned, vapors from these products form highly
corrosive acid compounds. These products should not be stored or
used near water heater or air inlet.
Combustion and ventilation air requirementes are determined by the
location of the water heater. The water heater may be located in either
an open (unconned) area or in a conned area or small enclosure, such as
a closet or small room. Conned spaces are areas with less than 50 sq.
ft.
ALL AIR FROM INSIDE THE BUILDING
The conned space shall be provided with two permanent openings
communicating directly with an additional room(s) of sufcient volume
so that the combined volume of all spaces meets the criteria for an
unconned space shall be considered in making this determination. Each
opening shall hace a minimum free area of 1 square inch pero 1,000
BTU per hour of the total input rating of all gas utilization equipment in
the conned space, but not less than 100 square inches.
The conned space shall be provided with
two permanent openings, one commencing
within 12 inches of the top and one
commencing within 12 inches of the
bottom of the enclosure. The openings shall
communicate directly, or by ducts, with the
outdoors or space (crawl or attic) that freely
communicate with the outdoors.
When directly communicating with the
outdoors, each opening shall have a minimum
free area of 1 square inch per 4,000 BTU per
hour of total input rating of all equipment in
the enclosure. (Figure 6)
When communicating with the outdoors
through vertical ducts, each openings shall
have a minimum free area of 1 square per
inch per 4,000 BTU per hour of total input
rating of all equipment in the enclosure.
(Figure 7)
1. When communicating with the outdoors
through horizontal ducts, each duct opening
shall have a minimum free area of 1 square
inch per 2,000 BTU per hour of total input
rating of all equipment in the enclosure.
(Figure 8)
When ducts are used, the shall be of the
same cross-sectional area as the free area
of the openings to which they connect.The
minimum dimension of rectangular air ducts
shall not be less than 3 inches. For other
combustion and ventilation air openings,
refer to the National Fuel Gas Code ANSI
Z223.1.*
Water
Heater
12" MAX
CHIMNEY OF GASVENT
12" MAX
MIN
MIN
AIR DUCT
100 sq in
100 sq in
Opening
Fig. 5
AIR SUPPLY ALL AIR FROM OUTDOORS
ONE OPENING SHALL BE WITHIN
12 INCHES OF THE TOP AND ONE
WITHING 12 INCHES OF THE BOTTOM
OF THE ENCLOSURE.
VENTILATION
LOUVERS
(EACH END OF ATTIC)
VENTILATION
LOUVERS
(EACH END OF ATTIC)
ALT. INLET
AIR
AIR OUTLET
AIR OUTLET
WATER HEATER
WATER HEATER
FURNACE
FURNACE
INLET AIR DUCT
INLET FT AIR
DUCT
ENDS 1”
ABOVE FLOOR
VENTILATION LOUVERS

5
NOTE: If the equipment room is located
against an outside wall and the air openings
communicate directly with the outdoors,
each opening shall have a free area of not
less than one square inch per 4,000 BTU
per hour of the total input rating of all
equipment in the enclosure.
Illustrations for Figures 5-8 copyright by
the American Gas Association. Used by
permission of the copyright holder.
MECHANICAL EXHAUSTING AND
FIREPLACES
The operation of air-moving devices such
as exhaust fans, ventilation system, clothes
dryers, replaces, etc., can affect the proper
operation of gas utilization equipment.
Consequently, special attention must be
given to conditions these devices may
create to avoid unsatisfactory operation of
the equipment.
POTENTIAL HAZARDOUS
DOWNDRAFT OPERATION
• EXHAUST FANS
• VENTILATION SYSTEM
• CLOTHES DRYERS
• FIREPLACES
• OTHERS
VENTING
This water heater uses a non-direct, single-pipe vent system to remove exhauts gases created by the burning of fossil fuels.
Air for combustion is taken from the immediate water heater location or is ducted in from the outside (see “Combustion Air
Sypply And Ventilation”).
This water heater must be properly vented for the removal of exhaust gases to the outside atmosphere. Correct installation
of the vent pipes system is mandatory for the proper and efcient operation of this water heater and is an important factor
in the life of the unit.
The vent pipe must be installed according to all local and state codes or, in the absence of local and state codes, the
“National Fuel Gas Code”, ANZI Z223.1 (NFPA 54)-latest edition. The vent pipe installation must not be obstructed so as to
prevent the removal of exhaust gases to the outside atmosphere.
U.L. approved fuel gas and carbon monoxide (CO) detectors are recommended in all applications and should be installed
using the manufacturer’s intructions and local codes, rules, or regulations.
Important: If you lack the necessary skills required to properly install this venting system, you should not proceed, but get
help from a qualied service technician.
When removing purged gases from a piping system, care should be taken to not create
hazardous condition, such as discharging the gases into a conned area or in an area which
contains an ignition source.
WARNING
DISCHARGE OF PURGED GASES
FIGURE 8
Equipment Located in Conned Spaces;
All Air From Outdoors. WATER HEATER
UPPER
AIR DUCT
LOWER
AIR DUCT
REVERSE
FLOW EXHAUST
HOOD
NATURAL DRAFT
EQUIPMENT
FURNANCE

6
VENT PIPE SIZE
It is important that you follow the guidelines in these instructions for sizing a vent pipe system. If a transition to a larger vent
size is required, the vent transition connection must be made at the blower outlet.
VERTICAL EXHAUST GASVENT
Vertical exhaust gas vents must be installed with U.L. listed type B vent pipe according to the vent manufacturer’s
instructions and the terms of it’s listing.
It myst be connected to the water heater’s blower by a certied vent connector or by directly originating at the blower
outlet.
WATER PIPING
Piping and ttings should be installed in compliance with the installation drawing. Check for dip tube in cold water tting
before connection of hot and cold water lines. If the indoor installation area is subject to freezing temperatures, water piping
must be propected. The water heater should be drained dif being shut down during freezing temperatures.
If solder connections are used, sweat tubing to the adaptor before ttind adaptor to the cold and hot water tting. It is
imperative that no heat be applied to the water heater tting as they may contain nometallic parts.
CAUTION OPERATING AN EMPTY OR PARTIALLY FILLED WATER
HEATER WILL RESULT IN DAMAGE TO THE TANK
Install the water pipping and tting as shown in Figure 4.
1. Connect the cold water supply (3/4” NPT) to the tting marked “C”.
Connect the hot watter supply (3/4” NPT) to the tting marked “H”.
Important: Some models may contain energy saving heat traps to prevent the circulation
of hot water within the pipes. Do not remove the inserts within the heat traps.
2. The installation of unions in both the hot and cold water supply lines
is recommended for ease or removing the water heater for service
or replacement.
3. The manufacturer of this water heater recommends installing a
thermostatic mixing valve or an anti-scald device in the domestic hot
water line. These valves reduce the point-of-use temperature of the
water by mixing cold and hot water and are readily aviable for use.
4. Install a shut-off valve in the cold water inlet line. It shold be located
close to the water heater and be easily accessible. Know the location
of this valve and how to shut off the water to the heater.
5. A temperature and pressure relief valve must be installed in the
opening marked “Temperature and Pressure (T &P) ReliefValve” on
the water heater.
6. Add a discharge line to the opening of the T & P relief valve. Follow
the instructions under “Temperature and Pressure ReliefValve”.
7. After piping has been properly connected to the water heater, remove
the aerator at the nearest hot water faucet. Open the hot water
faucet and allow the tank to completely ll with water. To purge the
lines of any excess air, keep the hot water faucet open for 3 minutes
after a constant ow of water is obtained. Close the faucet. Check all
connections for leaks. Replace the aerator.
PRESSURE BUILD-UP IN CLOSED WATER
SYSTEMS
The water utility supply meter may contain
a check valve, back-ow preventer, or water
pressure reducing valve. This will create a
closed water system. During the heating cycle
of the water heater, water expands creating
a pressure build-up in the water system. A
temperature and pressure relief valve must be
installed on the water heater (150 PSI maximum
pressure setting. See Temperature and Pressure
ReliefValve Page 8).
To prevent the temperature and pressure
relief valve from discgarging hot water, loss
of energy, and reduce the possibe build up of
lime on the water temperature and pressure
relief valve seat. An expansion tank must be
installed on the cold water supply line. For
every 50 US gallons of stored water, the
expansion tank must have a minimum capacity
of 1.5 US gallons See Figure 4.

7
0
For protection against excessive pressures and/or temperatures, a temperature and pressure relief valve must be installed in
the opening marked, “temperature and pressure relief valve”. A design certied 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 Shut-Off Devices for Hot Water Supply Systems, Z21.22 is furnished with this water heater.
Do not thread, cap, or plug the end of this discharge line. Do not connect discharge line directly to drain.
(Figure 4)
To prevent boduly injury, hazard to life or damage to property, the relief valve must be allowed to discharge water in the
event of excessive temperature or pressure developing in the water heater.
The function of the temperature and pressure relief valve is to discharge water in large quantities should circumstances
demand. If the discharge pipe is not directed to the drain, as shown in Figure 4, or other suitable means, the water ow may
cause property damage.
THE DISCHARGE LINE
(1) Must not be smaller than the pipe size of the relief valve.
(2) Must not be plugged or blocked.
(3) Must be of material capable of withstanding 210ºF without distortion.
(4) Must be installed so as to allow complete drainage of both the
temperature and pressure relief valve and discharge line.
(5) Must terminate at an adequate drain.
(6) Must not have any valve between the relief valve and the heater.
Failure to maintain the properly listed temperature and pressure relief valve will
release the manufacturer from any claims which might result from excessive
temperature or water pressure.
T&P RELIEF VALVE INSULATION
T&P RELIEF VALVE
DRAIN LINE
T&P RELIEF VALVE
MANUAL RELIEF
LEVER
T&P RELIEF VALVE INSULATION
WARNING: Do not attempt to operate this water
heater with cold water inlet valve closed.
Manually operate the temperature and pressure relief valve at least once a year (Figure 10).To prevent water damage,
discharge line must terminate at an adequiate drain. (Figure 4).
Standing clear of the outlet (discharge water may be hot), lift and realase the handle on the temperature and pressure relief valve
to make the valve operate freely. If the heater is installed in a closed system , the temperature and pressure relief valve may
drip at times. If the temperature and pressure relief valve discharges a full stream of water, have the system checked. See
“Pressure Build-Up in Water System”.
If the temperature and pressure relief valve on the appliance discharges periodically, this may be duel to thermal expansion
in a closed water supply system (see “Pressure Buidl-Up in Water System”). Contact the water supplier or local plumbing inspector
on how to correct this situation. Do not plug the temperature and pressure relief valve.
TEMPERATURE & PRESSURE RELIEF VALVE

8
T&P Relief Valve and Pipe Insulation. (Only Models with insulation material included in the package)
1. Locate the T&P Relief Valve on the Water Heater.
2. Locate the slit running the lenght of the insulation.
3. Spread this slit open and slip it over the T&P Relief Valve (See Figure 10). Apply gentle pressure to the insulation to
ensure it is fully seated on the T&P Relief Valve. Once sealed secure the insulation with a section of tape. IMPORTANT: The
insulation or tape should not block or cover the T&P Relief Valve drain opening. Also the insulation or tape should not block
or cover the T&P Relief Valve opening. Also the insulation or tape should not block or hinder access to the T&P Relief Valve
relief lever.
4. Next locate the hot water (outlet) & cold water (inlet) pipes to the water heater.
5. Spread the slit open at the base of the insulation and slip it over the cold water (inlet) pipe. Apply gentle pressure along
the length of the insulation to ensure it is fully seated around the cold water pipe. Also ensure that the base of insulation is
ush with the water heater. Once seated, secure the insulation with a section of tape.
SPACE HEATING/POTABLE WATER SYSTEM
Sine water heater models are equipped with inlet/outlet tapping for use with space heating applications. If this water heater
is to be used to supply both space heating and domestic potable (drinking) water, the instructions listed below must be
followed.
• Be sure to follow the manual(s) shipped with the air handler system.
• A properly installed ow control valve is required to prevent thermo-siphoning. Thermo-siphoning is the result of a
continuous ow of water through the air handler circuit during the off cycle.
• Weeping (blow off) of the temperature and pressure relief valve (T & P) or higher than normal water temperatures
are the rst signs of thermo-siphoning.
• The domestic hot water line from the water heater should be vertical past any tempering valve or supply line to
the air handle to remove air bubbles from the system. Otherwise, these bubbles will be trapped in the air handler
heat exchanger coil, reducing efciency.

9
DO NOT use this water heater as a replacement for an existing boiler installation.
DO NOT use with piping that has been treated with chromates, boiler seal or other chemicals.
DO NOT add boiler treatment or any chemicals to any heat piping, since the piping contains potable water.
DO NOT use with ferrous piping. The system should be installed only with new piping that is suitable for potable water,
such as copper or polybutylene.
DO NOT use with PVC piping.
DO NOT use any pumps, valves, or ttings that are not completely compatible with potable water piping.
DO NOT use valves that may cause excessive restriction to water ow.
USE FULL BLOW BALL OR GATES VALVES ONLY.
DO NOT tamper with the thermostat, gas valve, igniter control or temperature and pressure relief valve. Tampering
with any of these componets is DANGEROUS and can result in property damage or severe injury. Tampering avoids all
warranties. Only qualied personnel should service these components.
DO NOT use 50/50 solder in potable water lines.
IF THE SPACE HEATING system requires water temperature in excess of 120ºF, a mixing valve or other means should be
installed in the domestic (potable) hot water supply to limit the RISK OF SCALD DAMAGE (See PAGE A).
Some jurisdictions may require a backow preventer in the incoming cold water line. This may cause the temperature
and pressure relief valve on the water heater to discharge or weep due to expansion of the heated water. A diaphragm-
type expansion tank suitable for potable water will normally eliminate this weeping condition. Please read and follow the
manufacturer’s instructions for the installation of such tanks.

10
Fig. 11
A
V
V
X
G
INSIDE CORNER
DETAIL
D
E
v
vB
L
v
v
M
K
v
v
v
v
B
B
B
BA
J
X
X
B
C
F
FIXED
CLOSED
FIXED
CLOSED
OPERABLE
OPERABLE
VENT TERMINAL
AIR SUPPLY INLET
AREA WHERE TERMINAL IS NOT PERMITTED
Power Vent Terminal Clearances (uses room air for combustion)
A above grade, veranda, porch,
deck or balcony 12 in. G To inside corner 18 in.
Bto window or door that may
be opened
4 ft. below or to
side
of opening;
1 ft. above opening
J
to a non-mechanical air supply
inlet
into building or combustion air
inlet
to any other appliance
4 ft. below or to side of
opening,
1ft. above opening
Cto permanently closed window 0 in. K to a mechanical air supply inlet 3 ft. above if within
10ft. horizontally
D
Vertical clearance to ventilated soft
located above the terminal within a
horizontal distance of 2 ft. from the
center line of the terminal
12 in.† L
above paved sidewalk or paved
driveway
located on public property
7 ft.†
Eto unventilated soft 12 in. M under veranda, porch, deck, or
balcony 12 in.‡
Fto outside 24 in.
In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code:
† 1. Where local experience indicates condensate is a problem with Category IV appliances, the vent shall not terminate:
• over public walkways; or
• near soft vents or crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or cause property damage; or
• where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves or other equipment.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the oor.
TERMINATION CLEARANCES SIDE WALL POWER VENT
Note: The following picture and table are intended to illustrate clearance requirements, and do not serve as a
substitute for locally adopted installation codes.

11
Fig. 12
BLOWER
ASSEMBLY
8 in
LOOP
TO
DRAIN
DILUTION
AIR
INLETS
HOSE
CONNECTION
PORT FOR
CONDENSATE
DRAIN
BLOWER
PLUG
ES
TOD
FVS HOT SURFACE
Fig. 13
120 VOLTS 60 HZ
W
M
HS
TS PS
FVS
ES
EV
TOD
BK
ES
BLOWER ASSEMBLY INSTALLATION
1. This power vented water heater comes with blower assembly
installed (see Figure 12).
2. After unit is set in place, make sure blower assembly is still
mounted securely. Make sure there is no damage to blower.
3. Make sure there is no packing material in the inlet or discharge
of the blower.
4. This water heater is a polarity sensitive appliance and will not
operate properly if the power supply polarity is reversed. Power
to this water heater must be wired properly (correct polarity).
5. Do not plug in power cord until vent system is completely
installed.The Power Vent operates on 110 -120 VAC. therefore
a grounded outlet must be within reach of the 5.5-foot exible
power cord supplied with the heater. The power cord supplied
may be used on a unit only where local codes permit. If local
codes do not permit use of exible power supply cord:
a. Make sure the unit is unplugged from the wall outlet. Remove
the screw and open panel on the front of the junction box on
the blower.
b. Cut the exible power cord, leaving enough to be able to make
connections. Remove the strain relief tting from the box.
c. Install a suitable conduit tting inside the enclosure.
d. Splice eld wiring into existing wiring using code authorized
method (wire nuts, etc.).
e. Be certain that the neutral and line connections are not
reversed when making these connections.
f. Ground heater properly. This water heater must be grounded in
accordance with the “National Electrical Code”, NFPA 70 and/or
local codes. These must be followed in all cases. The water heater
must be connected to a grounded metal, permanent wiring
system or an equipment grounding conductor must be run with
the circuit conductors and connected to the equipment ground
ing terminal or lead on the water heater (see Figure 13; the
wiring diagram).
WIRING DIAGRAM

12
g. Close the panel on the junction box. Make sure the
access panel
is properly secured.
6. The blower discharge coupling boot is made to accept
only straight sections of 2” pipe. To start off with an
elbow, a short section of the straight pipe must be cut
and glued into the end of the elbow that will mount on
the discharge boot.
7. A rubber coupling is an integral part of the vent
system and must be used in every installation. Failure
to do so may result in overheating, poor performance,
nuisance lock-outs, personal injury or death.
INSTALLATION OF VENT SYSTEM
Before beginning installation of piping system, thoroughly
read the “Vent Pipe Preparation” section of this manual.
PLANNING THE VENT SYSTEM
Plan the layout of the vent system from the vent termination
to the water heater considering all of the 90 degree and 45
degree elbows plus the number of feet of pipe that would
be needed to install the total vent system. The water heater
must be vented to the outdoors as described in these
instructions. This water heater must be vented separately
from all other appliances. The unit may be vented horizontally
through a wall or vertically through the roof. Pipe runs must
be adequately supported along both vertical and horizontal
runs.
Note: Do not use an elbow as a support point. Elbows are
not designed to carry the load or stresses of the venting
system if they are rigidly held.
It is imperative that the rst hanger (or support) be located
on the horizontal run immediately adjacent to the rst 90°
elbow from the vertical rise. Support method used should
isolate the vent pipe from the oor joists or other structural
members to prevent the transmission of noise and vibration.
Do not support, pin, or otherwise secure the venting system
in a way that restricts the normal thermal expansion and
contraction of the chosen venting material.
If the water heater is being installed as a replacement for
an existing power vented heater in pre-existing venting,
a thorough inspection of existing venting system must be
performed prior to any installation work.Verify that correct
material, as detailed in below, has been used, and that the
minimum or maximum vent lengths and terminal location as
detailed in this manual have been met.

13
STREET ELBOW
BACK TO BACK ELBOWS
PREFERRED PRACTICE
90” SHORT SWEEP ELBOW
(MORE RESTRICTIVE)
90” LONG SWEEP ELBOW
(LESS RESTRICTIVE)
6 in.
min
NORMAL ELBOW
POLYPROPYLENE VENT SYSTEMS
Polypropylene vent systems do not use cement to connect the pipe
and elbow sections but use a push together gasket seal method.
Do not attempt to connect polypropylene with sealant cement.
Polypropylene vent systems are designed to use specic adaptors to
connect into the rubber coupling on the top of the blower. These are
available through your venting supplier.
The PVC vent termination elbow supplied with this heater has
been certied to be used with polypropylene vent systems. A
polypropylene to PVC end connection is required and is available
through your supplier.
Optional wall plates that t the polypropylene venting are also
available through your supplier.
Carefully inspect the entire venting system for any signs of cracks or
fractures, particularly at joints between elbows and other ttings and
straight runs of vent pipe. Check system for signs of sagging or other
stresses in joints as a result of misalignment of any components in the
system. If any of these conditions are found, they must be corrected
in accordance with the venting instructions in this manual before
completing installation and putting the water heater into service.
The vent piping must be connected to the blower with the rubber
coupling and secured with gear clamps. The coupling and clamps are
provided with the heater.
Even though the ue gas leaving the blower is hot, some installations
will have water condense in the vent piping. If this occurs, then
adequate means of draining and disposing of the condensate shall be
made by the installer.
CONDENSATE
Condensate formation does not occur in all installations of power
vented water heaters, but should be drained on installations where it
can form in the venting system. Condensation in the venting system
of power vented water heaters is dependent upon installation
conditions including, but not limited to, ambient temperature and
humidity of installation location, ambient temperature and humidity
of venting space, vent discharge and slope, and product usage. In
certain conditions, installations in unconditioned space or having long
horizontal or vertical vent runs can accumulate condensate. Long
lengths of venting that pass through cool/cold areas will experience
condensation. The vent pipe should be sloped upwards away from
the blower assembly, then adequate means for draining and disposing
of the condensate needs to be made by the installer. If installation
conditions cause condensation, install a condensate trap loop
approximately 8 in.in diameter using 3/8 in. plastic hose. Connect the
hose to the built-in drain port of the rubber coupling of the blower
assembly (see Figure 12). Loop the hose in a vertical position as
shown. The tube loop must be lled with water at least half way prior
to operating the heater. Ensure the end of the tube has access to a
drain as condensate will ow from the end. Secure the tubing to the
side of the heater. Prior to operating the water heater, make sure the
removable cap is installed on the drain port (if a drain hose is not
needed).
Note: This cap must remain in place if a drain hose is not
installed.
EXHAUST VENTING
This heater is designed to exhaust the products of combustion
(ue gases) to the outdoors using a sealed piping system. Table
1 lists the allowable vent materials and sizing information.
Figure 16 through Figure 18 show various end termination
details and clearances. Connection of the venting piping to the
blower is shown in Figure 19 through Figure 22.
Correct installation of the venting system is essential to the
safe and
efcient operation of this water heater. Vent piping must be
installed in accordance with all applicable codes. All installations
shall meet the requirements as stated in the current edition of
the “National Fuel Gas Code, ANSI Z223.1/NFPA
54”.
Note: The information provided in Figure 14 is intended as
a guideline for good vent installation practices only and is not
intended to restrict venting options beyond those restrictions
established by the current edition of the “National Fuel
Gas Code, ANSI Z223.1/NFPA 54” or any applicable
local and state codes.
Fig. 14

14
Fig. 15
• This heater is certied to be installed using PVC, CPVC, ABS
or polypropylene plastic vent material. Check with your local
authorities to determine which materials are allowed in your
area. All venting material and components must be joined with
the approved primer/ cleaner and solvent cement or mechanical
seals (see “Polypropylene Vent Systems”).
• Do not common vent this heater with any other appliance.
• Do not allow insulation to cover the vent piping.
• During operation the plastic piping will expand as it heats up and
contract as it cools down.This is normal for this type of venting.
Rigidly fastening the vent piping can cause undue stress that may
result in the cracking or fracturing the vent piping material. A
fracture of the venting pipe may pose a serious safety hazard. To
prevent stressing of the vent system, all hangers and supports
must allow the vent piping freedom to move.
• Use long sweep elbows wherever possible. Closely coupled
elbows and short radius elbows can reduce the venting capacity.
• All power vented water heaters generate a certain amount
of operational noise. In order to minimize noise transmission
to the support structure, use isolation pads between the pipe
hangers and the vent pipe.
• Most power vent installations develop some condensation in
the vent piping. When using long runs of venting or when the
venting passes through cold or unheated areas, cotnsiderable
amounts of condensate from the ue gases can develop.
Provision must be made for the condensate to drain freely from
the system or to be collected in a condensate trap(s) that can
be drained. Damage or fracture of the vent piping may occur
if the condensate is allowed to collect and freeze. Pooling of
condensate can restrict airow and can cause nuisance failures
of the system.
• In regions that experience freezing conditions, slope the venting
back towards the heater so that the condensate will drain back
to the blower and be collected in the condensate trap. Draining
condensate out through the termination can result in vent
freeze up resulting in a nuisance shut down situation. Ice formed
from frozen condensate can cause a safety hazard. See also
notes in the “Venting” section.
Venting terminations and sizing
• Heaters are supplied with a 3”x 2” rubber coupling to attach the
venting to the blower and a 2”, 45° vent termination elbow.
• Supplied with this heater is a vent termination screen (see
Figure 15).
Installed in the vent termination elbow, the vent screen is required
to keep foreign objects, rodents and small birds from entering the
venting system. This screen has been sized to ensure maximum
energy efciency of the vent system based on the “equivalent
length” of the vent piping. (see Figure 15).
How to determine the “equivalent length” is shown in Figure
in Table 1.
Vent screen installation
• Install the vent screen into the vent termination elbow.
• Gently push the screen into the termination elbow until it
sits against the inside shoulder.
• The metal wire screens are self-securing.
IMPORTANT NOTES AND WARNINGS

15
Calculating Equivalent Feet
Important:
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone) in non-metallic venting systems is prohibited
Important:
The exhaust vent piping must be connected to the blower using the rubber coupling supplied with this heater.
This coupling contains the condensate trap and is sized for the efcient ow of the exhaust gases. Failure to use the coupling can result
in an unsafe operating condition and poor heater performance.
Equivalent lengths of straight pipe for various elbows using Schedule 40 PVC, CPVC and polypropylene
Vent Pipe
Size
Elbow
Type
Short Sweep/
Short Radius
Long Sweep/
Long Radius
Notes:
1. Use long radius elbows where possible.
Minimum distance between 90º elbows
should be 6” wherever possible.
2. Venting systems may use a maximum of
ve (5) 90° elbows.
3. Use proper screen termination (see
Figure 32 & Figure 33).
2”
3”
4”
90º 8 ft. 5 ft.
2”
3”
4”
45º 4 ft. 2.5 ft.
Table 1
WATER
HEATER
MODEL
HEATER
INPUT
(Btu/hr.)
VENT SIZE
(Inside Diam.)
PRESSURE
SWITCH
SETTING
MAXIMUM EQUIVALENT
VENT LENGTH
MINIMUM EQUIVALENT
VENT LENGTH
40 & 50 gal. 40,000 2” - 0.60 in w.c. 50 ft. + termination elbow, 7 ft. + termination elbow,
40 & 50 gal. 40,000 3” - 0.60 in w.c. 120 ft. + termination elbow, 15 ft. + termination
elbow,

16
SEALANT
ATTACH
TERMINATION
ELBOW (MAY
ALSO BE 90º)
12 in.
MIN. *
RODENT
SCREEN
(INSTALL
INTO
ELBOW)
COVER PLATE
(OPTIONAL)
GROUND
LEVEL*
SEALANT
(UNDER
PLATE)
*WHERE SNOW COVER IS NORMAL DURING
WINTER, ENSURE OUTLET IS INSTALLED
ABOVE ANTICIPATED SNOW LEVEL.
VENT PIPING MAY
BE SLOPED IN ANY
DIRECTION, AS
LONG AS A WATER
TRAP IS NOT
CREATED IN THE
VENTING SYSTEM.
TH SLOPE
SHOULD BE KEPT
TO A MINIMUM
SO AS NOT TO
EXERT ANY UNDUE
STRESS ON THE
PIPE.
SEALANT
VENT PIPPING TO BE
SLOPED (DOWN)
TOWARD HEATER
TO PREVENT
WATER FROM
WATER FROM
COLLECTING
(MAY REQUIRE
A CONDENSATE TEE).
ATTACH
TERMINATION
ELBOW (MAY
ALSO BE 90º)
12 in.
MIN. *
*WHERE SNOW COVER IS NORMAL DURING
WINTER, ENSURE OUTLET IS INSTALLED
ABOVE ANTICIPATED SNOW LEVEL.
BRACKET
RODENT
SCREEN
(INSTALL
INTO
ELBOW)
SEALENT
(UNDER
PLATE)
GROUND
LEVEL'
VENT
RISER
COVER PLATE
(OPTIONAL)
EQUIVALENT
VENT LENGTH
MEASURED
FROM THIS
POSITION
Venting instructions
1. Plan the venting layout starting at the vent termination and
work back toward the heater. Take into consideration the
style and position of the vent termination, the vent pipe
routing, elbows and connectors required and the necessary
support hangers.
2. Venting should be as direct as possible with the fewest
number of ttings. Use long radius 45 degree and long radius
90 degree elbows wherever possible.
3. Avoid using 90 degree elbows “back to back” and do not
use street elbows. Maintain a minimum 6 in. straight section
between elbows. Closely coupled and short radius elbows
reduce the venting capacity. Figure 14 shows examples of vent
pipe connections.
4. DO NOT USE AN ELBOW AS A SUPPORT POINT. Elbows
are not designed to carry the weight of the venting system.
5. Calculate “Equivalent Vent Length” before starting. Do not
exceed the values shown in Table 1.
6. Measure the vent piping and cut to required lengths. Pipes
must be cut at right angles and deburred to ensure a good
smooth t with sufcient overlap for the glue joints. Correct
any interference conditions.
7. Provide support hangers for horizontal vent piping every 4
ft. to prevent sagging and stress. Provide a minimum of 1/8
in. rise per 4 ft. of vent piping to ensure adequate drainage
(polypropylene vent systems require a 1/4 in. rise per 1 ft.
of vent pipe). Horizontal vent piping must not sag to form
valleys where condensate can collect.Vertical venting shall
be supported every 5 ft. Use appropriate support straps and
vibration isolators (foam pads) on straight sections only. Allow
sufcient clearance for expansion and contraction of the
venting system.
8. At the point where the venting exits the building, cut a
3-1/2” hole for 3” venting or a 4-1/2” hole for 4” venting. For
sidewall applications.
11. Do not seal the vent piping to the wall until the venting is
properly connected to the blower assembly.
12. Complete the venting installation by sealing around the
termination assembly where it passes through the outside
wall, inside and out, with silicone or other suitable sealant.
BEWARE OF CONCEALED WIRING AND PIPING INSIDE THE
WALL.
Caution: Solvent cements may produce ammable vapors. Use only
in well-ventilated areas and keep away from all sources of ignition.
Note: DO NOT use solvent cement on polypropylene vent
systems.
9. Insert the vent piping through this hole and secure into
position. Connect the vent pipe to the end termination
elbow as shown in Figure 16 through Figure 18.
10. Dry t all vent pipes, elbows, connectors and ttings before
joining any parts with solvent cement. PARTS MUST FIT
WITH OUT STRESS OR BENDING OF ANY SECTION and
each connection must overlap a minimum of 1/2 in. Do not
force t any of the connections. Use only the appropriate
solvent cement.
Fig. 16
Fig. 17

17
Fig. 18
A VENT USED IN A
SPECIAL VENTING
SYSTEM WITH POSITIVE
VENT PRESSURE AND
PASSING THROUGH A
ROOF SHALL EXTEND AT
LEAST 18 in. ABOVE THE
HIGHEST POINT WHERE
IT PASSES THROUGH THE
ROOF SURFACE AND ANY
OTHER OBSTRUCTION
WITHIN A HORIZONTAL
DISTANCE OF 18 in.
A VERTICAL VENTING
SYSTEM MUST BE
SUPPORTED EVERY 5ft.
3 in. MIN.
LENGTH
TERMINATION
MAY BE 90°
ELBOW
RODENT
SCREEN
(INSTALL
INTO
ELBOW)
ROOF
LINE
18 in. OR
ABOVE
ANTICIPATED
SNOW LEVEL
Fig. 19
CONFIGURATION FOR 40 AND 50
GALLON (LO-INPUT) HEATERS
CONNECTED TO 2"VENTING.
2" VENT PIPE
2" RUBBER
COUPLING
(SUPPLIED)
BLOWER
Fig. 20
CONFIGURATION FOR 40 AND 50
AND GALLON (LO-INPUT) HEATERS
CONNECTED TO 3"VENTING.
*FOR 3" DIRECT CONNECTION TO
THE BLOWER
2" RUBBER
COUPLING
(SUPPLIED)
3" VENT PIPE
2" - 3" ADATER * (FIELD SUPPLIED)
2" VENT PIPE, 7 mm (3 in) MAX LENGTH
BLOWER
Fig. 21
2" RUBBER
COUPLING
(SUPPLIED)
BLOWER
4" VENT PIPE
2" VENT PIPE, 75 mm (3 in) MAX LENGTH
2" - 4" ADAPTER (FIELD SUPPLIED)
Fig. 22
2" VENT
PIPE*
(SUPPLIED)
2" VENT
PIPE*
(SUPPLIED)
2" ELBOW
** (FIELD SUPPLIED)
2" RUBBER
COUPLING
(SUPPLIED)
BLOWER
Vent pipe connection to blower
1. The vent piping connects into the rubber coupling
located on the top of the blower assembly. This coupling
includes gear clamps to connect the venting to the
blower. These connections must be properly seated and
tightened to prevent the leakage of ue gases into the
area. See Figure 19 through Figure 22.
2. The water heater is supplied with a 3” x 2” rubber
coupling to accept the vent pipe and is required in all
installations. Do not attempt to connect the vent piping
directly to the blower without using the rubber coupling.
3. Before installing clean and lightly sand the end of the
plastic vent piping that will connect into the rubber
coupling. For polypropylene vent systems follow
manufacturer’s instructions.
4. Loosen the upper clamp on the rubber coupling and
insert the sanded end of the vent piping a full 1-1/4in.
Do not use glue or sealant in the rubber coupling.Check
that there is no stress on the connection or the vent
piping that may be caused by twisting or bending.
5. Tighten the upper clamp so that the vent piping is rmly
secured in the coupling and is gas tight. Do not over
tighten or cause distortion of any of the parts. Ensure
the bottom of the rubber coupling is rmly seated
on the blower outlet and that the lower gear clamp
is also secure. Check to ensure there is no distortion
or movement of the clamped assembly once it is
completed.
6. If the outlet vent pipe is to be turned horizontally
directly off the blower, a 3 in. long section vent pipe shall
be used to connect the elbow to the rubber coupling
(see Figure 22).
Note: Polypropylene vent systems require separate
adaptor.