A.O. Smith G6-PVT4050NV Product information sheet
Installaon Instrucons and
Use & Care Guide
Keep this manual in the pocket on heater for future reference whenever maintenance, adjustment or service is required.
Retain your original receipt as proof of purchase.
DO NOT RETURN THIS UNIT TO THE STORE
Read this manual and the labels on the water heater before you install,
operate, or service it. If you have diculty following the direcons, or
aren’t sure you can safely and properly do any of this work yourself:
• Call your Local plumbing supplies store to have this water heater installed.
Professional Installaon is available for this product and the work is guaranteed.
• Schedule an appointment with a qualied person to install your water heater.
• Call our Technical Assistance Hotline which is listed on the water heater’s
warranty sheet. We can help you with installaon, operaons, troubleshoong,
or maintenance. Before you call, write down the model and serial number from
the water heater’s data plate.
Incorrect installaon, operaon, or service can damage the water heater, your
house and other property, and present risks including re, scalding, electric shock,
and explosion, causing serious injury or death.
Residenal Gas
Water Heater
Residenal Direct Vented Gas Water Heater
Not for use in Manufactured (Mobile) Homes
100369451_2000626161_REV.A
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
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your build-
ing.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instrucons.
• If you cannot reach your gas suppli-
er, call the re department.
Installaon and service must be per-
formed by a qualied installer, service
agency or the gas supplier.
WARNING: If the informaon in
these instrucons is not followed
exactly, a re or explosion may
result causing property damage,
personal injury or death.
LOW LEAD
C
O
NTENT
June, 2023
Table of Contents
Important Safety Informaon.................................................. 3
Geng Started ........................................................................ 7
Installaon............................................................................. 15
Operaon .............................................................................. 24
Troubleshoong .................................................................... 26
Maintenance ......................................................................... 30
Repair Parts ........................................................................... 33
Notes .................................................................................. 35
2 • Residenal Gas Water Heater Use and Care Guide
Vent Termination Hood
Wall Plate
Inlet Water
Shut-off Valve
Inlet Water
Shut-off Valve
Temperature and Pressure
Relief Valve
Combo Heating System
Supply Outlet (Optional)
Discharge Pipe
Combo Heating System
Supply Return Inlet (Optional)
Floor Drain
Drain Pan
Manual Gas
Shut-off
Drip Leg
Gas Control Valve/
Thermostat
Hot Outlet
Cold Inlet
Vent Pipe
Residenal Gas Water Heater Use and Care Guide • 3
manual.
An odorant is added by the gas supplier to the gas used by this water heater.
This odorant may fade over an extended period of me. Do not depend upon
this odorant as an indicaon of leaking gas. We recommend installing a fuel
gas and carbon monoxide detector.
This product is cered to comply with a maximum weighted average of
0.25% lead content as required in some areas.
DANGER
WARNING
CAUTION
NOTICE
*Drain and flush tank and remove and
inspect anode rod after first six months
of operation and at least annually
thereafter. Operate the Temperature
and Pressure Relief Valve (T&P) annually
and inspect T&P valve every 2-4 years
(see the label on the T&P valve for
maintenance schedule). If no label is
attached to the T&P Relief Valve, follow
the instructions in the T&P Relief Valve
Maintenance section of this manual.
See the Maintenance section for more
information about maintaining this
water heater.
Fill out this secon and keep this manual
in the pocket of the water heater for
reference.
Date Purchased:
Model Number:
Serial number:
Maintenance performed:* Date:
4 • Residenal Gas Water Heater Use and Care Guide
To reduce the risk of property
damage, serious injury or death, read
and follow the precauons below,
all labels on the water heater, and
the safety messages and instrucons
throughout this manual.
INSTALLATION AND
MAINTENANCE
• Use at least two people to li the
water heater.
• Be sure you both have a good grip
before liing.
• Use an appliance dolly or hand truck
to move the water heater.
or carbon monoxide poisoning.
• Do not connect a natural gas water
heater to an L.P. gas supply.
• Do not connect an L.P. gas water
heater to a natural gas supply.
• Use a new CSA approved gas supply
line.
• Install a shut-o valve on the gas
supply line.
Gas Pressure
maximum supply pressure as stated
gas supply pressure must not exceed
L.P. gas pressure. L.P. gas pressures
exceeding 13” water column can
OPERATION
This water heater
can make water hot
enough to cause
severe burns instantly, resulng in
severe injury or death.
• Feel water before bathing or show-
ering.
• To reduce the risk of scalding, install
Thermostac Mixing Valves (tem-
perature liming valves) at each
point-of-use. These valves automa-
cally mix hot and cold water to limit
the temperature at the tap. Mixing
valves are available at your local
plumbing supplier. Follow the man-
ufacturer’s instrucons for installa-
on and adjustment of the valves.
• The gas control valve on this water
heater has been factory set to its
lowest seng to reduce the risk
of scalding. Higher temperatures
increase the risk of scalding, but even
at 120°F, hot water can scald. If you
choose a higher temperature seng,
Thermostac Mixing Valves located
at each point-of-use are parcularly
important to help avoid scalding.
Table 1
Temperature Time to Produce a
Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1½ to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1½ seconds
155°F (68°C) About 1 second
For more informaon about changing
the factory temperature seng, refer
to the “Adjusng the Temperature”
secon in this manual.
Even if you set the water heater’s gas
control valve to a low seng, higher
water temperatures may occur in
certain circumstances.
• In some cases, repeated small draws
of water can cause the hot and cold
water in the tank to “stack” in layers.
If this happens, the water can be as
much as thirty degrees hoer than
the gas control valve seng. This
temperature variaon is the result
of your usage paern and is not a
malfuncon.
• Water temperature will be hoer if
someone adjusted the gas control
valve to a higher seng.
• Problems with the gas control valve
or other malfuncons may result in
higher than expected water tem-
peratures.
• If the water heater is in a hot envi-
ronment, the water in the tank can
become as hot as the surrounding
air, regardless of the temperature
seng.
• If the water supplied to the water
heater is pre-heated (by a solar
heang system) the temperature
in the tank may be higher than the
Residenal Gas Water Heater Use and Care Guide • 5
water heater’s temperature seng.
• Should overheang occur or the
burner fail to shut o, turn o the
manual gas supply valve to the
water heater and call a qualied
person.
If anyone in your home is at parcular
risk of scalding (for example, the
elderly, children, or people with
disabilies) or if there is a local code
or state law requiring a certain water
temperature at the hot water tap,
these precauons are parcularly
important.
According to a naonal standard
American Society of Sanitary
Engineering (ASSE 1070) and most
local plumbing codes, the water
heater’s thermostat should not be
used as the sole means to regulate
water temperature and avoid scalds.
Properly adjusted Thermostac
Mixing Valves installed at each
point-of-use allow you to set the
tank temperature to a higher seng
without increasing the risk of scalds. A
higher temperature seng allows the
tank to provide much more hot water
and can help provide proper water
temperatures for appliances such as
dishwashers and washing machines.
Higher tank temperatures (140°F) also
kill bacteria that cause a condion
known as “smelly water” and can
reduce the levels of bacteria that
cause water-borne diseases.
Do not use chemicals that could
contaminate the potable water supply.
Do not use piping that has been
treated with chromates, boiler seal, or
other chemicals.
This water heater
is equipped with a
Flammable Vapor Ignion Resistance
(FVIR) system. FVIR is designed to
reduce the risk of ammable vapor-
related res. FVIR makes this product
more sensive to installaon errors or
improper installaon environments.
The FVIR system will not prevent a
possible re/explosion if ammable
vapors have accumulated in the
combuson chamber and the water
heater is lit.
Do not aempt to light this appliance
by any means if you suspect
ammable vapors have accumulated
inside or outside the appliance.
Immediately call a qualied person to
inspect the appliance. Water heaters
subjected to a ammable vapors
incident will show a discoloraon
on the ame arrestor and require
replacement of the enre water
heater. Improper installaon or an
inadequate air supply can also cause
the FVIR system to disable the water
heater.
feature in any way. Doing so can
monoxide.
To reduce the risk of a re that could
result in property damage, or serious
injury or death:
• Do not store things that can burn
easily such as paper or clothes next
to the water heater.
• Do not store or use gasoline or other
ammable substances in the vicinity
of this or any other appliance.
• Keep the water heater from becom-
ing wet. Immediately shut o the
water heater and have it inspected
by a qualied person if you nd that
the wiring, gas control valve/ther-
mostat or surrounding insulaon
have been exposed to water in any
way (e.g., leaks from plumbing and
leaks from the water heater itself
can damage property and could
cause a re risk). If the water heater
is subjected to ood condions or
the gas control valve/thermostat has
been submerged in water, the enre
water heater must be replaced.
• Replace the water heater’s viewport
if glass is missing or damaged. Re-
pair the combuson chamber door
seals if damaged.
High temperatures and
pressures in the water
heater tank can cause an explosion
resulng in property damage, serious
injury or death. A new Temperature
and Pressure (T&P) Relief Valve is
included with your water heater to
reduce risk of explosion by discharging
hot water. Addional temperature and
pressure protecve equipment may
be required by local codes.
A naonally recognized tesng
laboratory maintains public inspecon
of the valve producon process
and ceres that it meets the
requirements for Relief Valves for Hot
Water Supply Systems, ANSI Z21.22.
The T&P Relief Valve’s relief pressure
must not exceed the working pressure
rang of the water heater as stated on
the rang plate.
Maintain the T&P Relief Valve
properly. Follow the maintenance
instrucons provided by the
manufacturer of the T&P Relief Valve
(label aached to T&P Relief Valve).
If no label is aached to the T&P
Relief Valve, follow the instrucons
in the T&P Relief Valve Maintenance
secon of this manual. An explosion
could occur if the T&P Relief Valve
6 • Residenal Gas Water Heater Use and Care Guide
or discharge pipe is blocked. Do not
cap or plug the T&P Relief Valve or
discharge pipe.
CAUTION! Hydrogen gas builds up
before using any electrical appliances
operates by burning gas. Carbon
and abnormal amounts of carbon
monoxide can cause carbon
• Do not install this water heater in
a mobile home or manufactured
housing.
• Failure to follow these instrucons
can result in serious injury or death
from carbon monoxide poisoning.
This water heater’s
venng system can
become hot enough to burn. Do not
touch the venng system while water
heater is on, or unl the water heater
is turned o and venng allowed to
cool.
Figure 1 - Gas Water Heater Hook-Up Kit
Figure 2 - Install a Pressure Reducing Valve set
to 50 to 60 psi.
Residenal Gas Water Heater Use and Care Guide • 7
GETTING STARTED
GETTING STARTED
1 Review all of the instrucons
before you begin work.
Improper installaon can
damage the water heater, your home
and other property, and can present
risks of serious injury or death.
2 This water heater is a direct
vented water heater which
takes its combuson air from
the outside of the structure and
exhausts all products of combuson
to the outside of the structure.
This water heater must be installed
according to all local and state codes
or, in the absence of local and state
codes, the “Naonal Fuel Gas Code”,
ANSI Z223.1 (NFPA 54)-current
edion. This is available from the
following:
CSA America, Inc.
8501 East Pleasant Valley Road
Cleveland, OH 44131
Naonal Fire Protecon Associaon
1 Baerymarch Park
Quincy, MA 02269
Check with local code ocials about
codes governing this installaon.
Have your installaon inspected by a
code ocial to ensure the installaon
meets all local codes.
NOTICE: If you lack the necessary
skills required to properly install this
water heater, or you have diculty
following the instrucons, you should
not proceed but have a qualied
person perform the installaon of this
water heater.
Massachuses code requires this
water heater to be installed in
accordance with Massachuses
248-CMR 2.00 and 248-CMR 5.00:
State Plumbing Code. Other local
and state authories may have
similar requirements or other codes
applicable to the installaon of this
water heater.
3 Before you start, be sure you
have the following tools and
supplies:
• Plumbing tools and supplies appro-
priate for the type of water pipes in
your home.
• Thread sealant tape or pipe joint
compound approved for potable
water.
• For homes with copper pipes, you
may purchase a Gas Water Heater
Hook-Up Kit (available at your local
plumbing supplier) with compres-
sion ngs that do not require
soldering. This kit includes two 12”
ex water lines, an 18” exible gas
line, two nipples, and thread sealant
tape.
• For homes with plasc pipe, use
threaded connectors suitable for the
specic type of plasc pipe used:
CPVC or PEX (cross-linked polyeth-
ylene). Do not use PVC pipe.
• Non-corrosive gas leak detecon
soluon made from hand dishwash-
ing soap mixed with water (1 part
soap to 15 parts water) or children’s
soap bubbles and a small, so-bris-
tled brush.
• An appliance dolly or hand truck to
move the water heater.
Recommended Accessories
• A metal drain pan
• Automac water leak detecon and
shut-o device
• Pressure Reducing Valve
• Thermal Expansion Tank
• Thermostac Mixing Valves at each
point-of-use
• Fuel gas and carbon monoxide
detector
Before installing the water heater, you
must determine the amount of air
needed to supply this water heater
and any other gas appliances in the
same area and provide adequate air
for combuson and venlaon.
requires and adequate source
and abnormal amounts of carbon
monoxide.
Before beginning:
For safe operaon an adequate supply
of fresh, uncontaminated air must be
provided for combuson.
This gas-red water heater is a direct
vent model. It connects directly to
the outside of the building through
the vent terminaon hood. The hood
operates as both the combuson air
intake and the heater exhaust port
(see Figure 4).
All combuson air is obtained from
outside the building through this
hood. Ensure the area around the
terminaon hood is always kept clear
and that the air supply is not exposed
to contaminaon or ammable
vapors.
8 • Residenal Gas Water Heater Use and Care Guide
WARNING! Carbon Monoxide
poisoning.
The vent system must be installed
according to local and state codes, or
in the absence of local or state codes,
the “Naonal Fuel Gas Code”, ANSI
Z223.1 (NFPA 54)-current edion. Do
not common vent this water heater
with any power vented appliance. Do
not use a vent damper anywhere in
the vent system of this water heater.
To reduce the risk of carbon monoxide
poisoning, install a fuel gas and
carbon monoxide detector. Install and
maintain the detector in accordance
with the manufacturer’s instrucons
and local codes.
Installing a New Vent System
This direct vent water heater uses a
sealed venng system to supply fresh
combuson air to the heater and to
exhaust the products of combuson
(ue gases) to the outdoors The
venng is a “pipe in a pipe” system.
The inner (3”) piping carries out the
exhaust ue gases while the outer (6”)
piping carries in fresh combuson air.
The corrugated end of the vent piping
connects to the top of the water
heater and the opposite end connects
to the vent terminaon hood which
will be mounted on the exterior wall
(see Figure 4). Figure 4 shows the
hot exhaust gas exit and the locaon
of the combuson air intake. Figure
7 through Figure 13 show how to
assemble and connect the venng
system.
Figure 14 through Figure 18 show
various installaon opons.
Vent Terminal Clearances
The vent system must terminate so
that proper clearances are maintained
as cited in local codes or the current
edion of the “Naonal Fuel Gas
Code”, ANSI Z223.1/NFPA 54 as
follows:
GETTING STARTED
GETTING STARTED
**Minimum 12 in.
Minimum 12 in.
above grade or
anticipated snow
level
Minimum 12 in.
under veranda, porch,
deck or balcony
(see footnote 1)
Minimum
3 ft.
above if within
10 ft.
horizontally to
a mechanical air
supply inlet
Minimum 9 in. to a non mechanical air supply inlet
into building or combustion air inlet to another appliance
Minimum 12 in.
from soffit
*Minimum 9 in. to
a window or door
that may be opened
**Minimum
18 in.
from outside
corner
1. Permitted only if veranda, porch, deck or balcony is fully opened on a minimum of two sides beneath the floor.
2. A vent shall not terminate above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
AREA WHERE TERMINAL IS NOT PERMITTED
VENT TERMINAL AIR SUPPLY INLET
Minimum
3 ft.
clearance to a
service regulator
vent outlet
** Or as required by local authorities.
Figure 3 - Vent Terminaon Hood
Residenal Gas Water Heater Use and Care Guide • 9
GETTING STARTED
GETTING STARTED
When the heater is in operaon, the
vent terminaon hood will be hot (see
Figure 4).
HOT
EXHAUST
GAS OUT
FRESH
COMBUSTION
AIR IN
SCREW
Figure 4 - Vent Terminaon Hood
A Safety cover (see Figure 5) is
available to prevent accidental contact
with the vent terminal. Contact your
Customer Service Department for
ordering informaon.
Figure 5 - Safety Cover
Alternavely, a wire mesh or louvered
fencing guard can be built around the
terminaon as shown in Figure 6.
NOT TO BE USED AS
A STORAGE AREA
Figure 6 - Fencing Guard/Safety Cover
Aer the locaon for the vent
terminal has been selected as outlined
in Figure 3 and Figure 4, use the
following illustraons for installaon:
Cut a clearance hole, approximately
7”in diameter, through the exterior
wall for the vent assembly. The
recommended height is 64” for 40
gallon models or 73” for 50 gallon
models, as measured from the hole
center to boom of water heater.
Where the wall is combusble and
the wall thickness is over 14”, a 1”
clearance to combusble surfaces
around the vent terminal is needed.
The rst 14” is zero clearance (see
Figure 9 on page 10).
Standard Vent Arrangement
* If the horizontal length of the
venng is less than 30” the restricter
plate must be installed (see Figure 10,
Figure 16 through Figure 18).
• Do not use the restricter plate in an
oset installaon (see Figure 14).
• Do not use the restricter plate if the
horizontal length of the venng is
greater than 30”.
• Do not use the restricter plate for
installaons where elevaon is at or
exceeds 5,400 feet.
NOTICE: The length of “unstretched”
corrugated tube could cause the
length of the vent run to exceed the
minimum. In this case cut o a piece
of the corrugated tube to achieve the
17” minimum vent length.
10 • Residenal Gas Water Heater Use and Care Guide
Vent Assembly
The vent piping and the vent
terminaon hood are to be connected
as shown in Figure 7. Maintain
vent clearances to combusbles
as shown in Figure 9. Depending
on your access to where the vent
terminaon passes through the wall,
you may wish to connect the piping
and vent terminaon hood together
rst. Inside the vent piping there are
springs that hold the two corrugated
pipes in posion. When the pipes
are stretched to the required length,
the springs will remain properly
spaced. To connect the vent piping
to the vent terminaon hood, rst
slide the inner (3”) corrugated pipe
over the inner vent terminaon pipe.
Connue this acon unl the locking
clip on the corrugated pipe snaps into
posion in the corresponding groove
(see Figure 7). Secure corrugated
pipe with screw (supplied) inserted
through hole opposite the locking clip.
Repeat this process with the outer
(6”) corrugated pipe and lock it into
posion on the outer pipe on the vent
terminaon (see Figure 7). Secure
corrugated pipe with screw (supplied)
inserted through hole opposite the
locking clip.
NOTICE: To reduce the fricon
between the corrugated pipe and
the O-rings, it is recommended to
dampen the O-rings with water. The
completed connecon is shown in
Figure 8.
Outer
Corrugated
Pipe Locking
Clip
Inner Vent Termination
Pipe Outer Vent
Termination Pipe
Inner
Corrugated Pipe
Locking Clip
Groove
O-Ring
Figure 7 - Vent Piping
Screw
Figure 8 - Completed Vent Connecon
Some models are supplied with trim
plates which may be used to cover
the holes in the wall (see “Completed
Installaon” on page 2 and
Figure 9). Slide one trim plate (if
supplied) over the outer corrugated
tube, then insert the outer corrugated
tube through the clearance hole from
exterior wall. Secure the trim plate to
the exterior wall, then secure the vent
terminal to the exterior wall with 4
screw anchors (included) appropriate
for the type of wall construcon.
Caulk the juncon of the vent terminal
base plate and the exterior wall with
exterior type sealant (not included).
Slide the trim plate (inside) over the
outer corrugated tube and fasten the
trim plate to the interior wall. Caulk
the juncon of the outer corrugated
tube and the trim plate (inside) with
suitable sealant. The vent terminaon
hood aaches to the vent piping as
shown in Figure 9.
Spring Trim Plate
(Inside)
Apply
Sealant
Cutaway to
Show Spring
Placement
Apply
Sealant
Trim Plate
(Outside)
1”
Clearance
14” Zero
Clearance
Figure 9 - Trim Plate Install
Vent Restricter Plate
The vent restricter plate (see Figure 10)
is required for short horizontal runs on
low vent installaons (Figure 16) and
high vent installaons (Figure 18).
For short horizontal vent runs (see
Figure 17) place the restricter plate
over the ue tube reducer before
connecng the inner corrugated tube
to the ue tube reducer. DO NOT use
the restricter plate if the horizontal run
is greater than 30”.
For high vercal runs use the restricter
plate only when the vercal run of the
venng above the heater is greater
than 48” (see Figure 18).
Do not use the restricter plate for
short horizontal runs or high vent
installaons where elevaon exceeds
5,400 feet.
Flue Tube
Reducer Upper Air
Inlet Box
Restricter
Plate
Figure 10 - Restricter Plate
Tubing
• Pull the inner corrugated tube
towards the water heater and leave
some length over the water heater’s
center for bending (see Figure 11).
• Pull the outer corrugated tube
toward the water heater and leave it
2” shorter than the inner corrugated
tube.
• Make sure there are two springs
evenly spaced at the bend in the
tube.
• Use metal hangers spaced a maxi-
mum of 36” apart to keep venng
level or with a slope upward from the
heater to terminal. It is recommend-
ed to add vibraon isolaon between
the venng and hangers to prevent
vibraon and noise from spreading
to the rest of the building.
GETTING STARTED
GETTING STARTED
Residenal Gas Water Heater Use and Care Guide • 11
GETTING STARTED
GETTING STARTED
Flue Tube
Reducer
Inner
Corrugated
Pipe
Apply
Silicone
Flue Tube
Reducer
Restricter
Plate
Figure 11 - Uncompressing the Corrugated
Tubing
Heater
Bend both the corrugated pipes
toward the ue connecon on the
water heater. Pull and connect the
inner corrugated pipe to the water
heater’s ue tube reducer with hi-
temp red silicone (included) and gear
clamp. Make sure this connecon is
ght and leak proof (see Figure 12).
*The sealant between the inner
corrugated pipe and water heater’s
ue tube reducer must be hi-temp red
silicone or other material suitable for
600°F connuous service.
NOTICE: If you are using the vent
restricter plate, the inner vent pipe is
to go over the side legs and down the
stops.
Smooth
Easy Curve
Restricter
Plate Stop
Cutaway to
Show Details
Gear Clamp
Figure 12 - Vent Connecon to the Water
Heater
Apply hi-temp red silicone (included)
around the collar on air manifold box.
Pull the outer corrugated pipe all the
way on to collar and secure with the
gear clamp. Pull the free end of the
corrugated pipe past the gear clamp
and secure with one sheet metal
screw (see Figure 13).
Smooth
Easy Curve
Apply silicone
to Airbox before
attaching pipe
Secure with
a sheetmetal
screw
Gear Clamp
Figure 13 - Apply Silicone to the Venng
Where a straight vent arrangement is
impossible, a horizontal 90° maximum
bend can be made. Use the water
heater casing outer diameter as a
template to form the corrugated tube.
Smooth
Easy Curve
90°
Maximum
Bend
Figure 14 - Venng Alignment (Top View)
Figure 15 - Bad Venng Conguraons
NOTICE: To ensure good exhaust gas
ow, bend vent piping using a smooth,
easy curve as shown in Figure 12
through Figure 14. Do not use reverse
or compound curves as shown in
Figure 15.
Use Table 2 with Figures 16-18.
Table: 2
DIM. 4036 5038
A80” MAX.
B9” MIN.
C
(RECOMMENDED) 63.63” 73.00”
C
(MINIMUM) 60.75 69.50
D 14.25” MIN.
NOTICE: Dimension “C” is the height above
to oor to the center of the terminaon hole
through the exterior wall.
Above
anticipated
snow level
or 12” above
grade.
1
9156
78
C
A
B
Low Vent Installation
Figure 16 - Low Venng Installaon
Above
anticipated
snow level
or 12” above
grade.
9
4
C
D
Medium Vent Installation
9”
Figure 17 - Medium Venng Terminaon
12 • Residenal Gas Water Heater Use and Care Guide
12” Min.
Below
Soffit
72”
Max.
High Vent Installation
17”
Min.
6
1 5
1
2
Figure 18 - High Venng Terminaon
NOTES: (applies to Figure 16 through
Figure 18)
1. In any installaon the total of
dimension “A” plus dimension “B”
must not exceed 89”.
2. This heater can be installed with
0” clearance to a wall.
3. Minimum vent pipe clearance to
combusbles is 1” (see Figure 9).
4. Minimum distance from center of
heater to wall is 14.25”.
5. Dimension “A” includes wall
thickness.
6. Hole diameter in wall is 7”.
7. Venng must slope up away from
the heater a minimum of 0.25”
per foot of length to prevent
condensaon from collecng and
to provide sucient dra.
8. Distance above horizontal at full
extension is 2”.
9. Use support stays to hold the
venng to avoid sags or valleys.
Replacing a Water
Read the “Installing a New Vent
System” secon of this manual
and make sure your vent system
is properly installed. Inspect the
exisng vent system for obstrucons,
corrosion, and proper installaon.
Repair or replace if necessary. The
exisng vent system must be UL listed
and installed according to the vent
manufacturer’s instrucons and the
terms of its lisng. Do not use other
materials such as dryer vent hose.
See Applicaon A and B to determine
if your new water heater can be
retroed to an exisng vent
terminaon hood:
11-13/16"
7"
Figure 19 - American Vent Terminaon Hood (A)
A current American DV water heater
vent terminaon includes 3 inch inner
piping to carry out the exhaust ue
gases and 5 inch outer piping to carry
in fresh combuson air.
If replacing a current American DV
water heater, a duct reducer and
union adapter must be installed to
connect the exisng vent terminaon
hood to new inner and outer piping.
Use kit number 100366535.
IMPORTANT: A weather shroud
is provided in this kit and must
be installed over the exisng vent
terminaon hood to ensure adequate
protecon from wind and other
weather related hazards. Failure to do
so may result in pilot outages at the
water heater.
8"
8-1/2"
Figure 20 - Bradford White Vent Terminaon
Hood (B)
A Bradford White® DV water heater
vent terminaon includes 3 inch inner
piping to carry out the exhaust ue
gases and 5 inch outer piping to carry
in fresh combuson air.
If replacing a Bradford White DV
water heater, a duct reducer and
union adapter must be installed to
connect the exisng vent terminaon
hood to new inner and outer piping.
Use kit number 100366536.
If you are not sure the exisng vent
terminaon hood is compable
with your new water heater, call our
Technical Assistance Hotline which is
listed on the water heater’s warranty
sheet.
GETTING STARTED
GETTING STARTED
Residenal Gas Water Heater Use and Care Guide • 13
GETTING STARTED
GETTING STARTED
This water heater connects to the vent
terminaon hood using the sealed air
intake and exhaust piping.
During operaon this piping
can become hot, especially in
areas experiencing high ambient
temperatures.
When installed in a conned space
such as a closet, it is recommended
that the conned space be venlated
to minimize the buildup of heat
around the water heater. Figure 21
and Figure 22 show examples of
venlang a conned space.
TOP VIEW
OF CLOSET
WITHOUT DOOR AIR
INTAKE*
TOP VIEW OF
CLOSET WITH
DOOR
0” MIN.
0”
MIN.
5.5” MIN.
* DO NOT BLOCK OR RESTRICT IN
ANY MANNER, THE AIR INTAKES AT
THE BACK OF THE WATER HEATER.
0”
MIN.
Figure 21 - Conned Space Clearances
ROOM
AIR FLOW
ROOM AIR
FLOW
FRONT VIEW
OF DOOR
VENTILATION
AIR
OPENING
Figure 22 - Conned Space Venlaon
Gas Piping
Gas piping must be installed according
to local and state codes or, in the
absence of local and state codes, the
“Naonal Fuel Gas Code”, ANSI Z223.1
(NFPA 54)-current edion.
NOTICE: When installing gas piping,
apply pipe joint compound or thread
sealant tape approved for fuel gases.
Ground
Joint
Union
Manual Gas
Shut-off
3” Min.
Check with
local utility for
minimum height
Sediment Trap
Figure 23 - Gas Piping
1. Install a readily accessible manual
shut-o valve in the gas supply
line as recommended by the local
ulity. Know the locaon of this
valve and how to turn o the gas
to this unit.
2. Install a Sediment Trap as shown
in the Gas Piping gure below.
The Sediment Trap must be no
less than three inches long for
the accumulaon of dirt, foreign
material, and water droplets.
3. Install a ground joint union be-
tween the gas control valve and
the manual gas shut-o valve.
This is to allow easy removal of
the gas control valve. NOTICE: a
hard line connecon is shown in
Figure 23 (a exible gas line con-
necon may also be used).
4. Turn the gas supply on and check
for leaks. Use a small, so-bristled
brush to apply a hand dishwash-
ing soap and water mixture (1
part soap to 15 parts water) or
children’s soap bubbles to all con-
necon points of the gas piping.
Saturate all the connecons and
check for gas leaks (which will
appear as small bubbles). If any
leaks are detected, ghten the
appropriate connecon(s) and
re-check.
Gas Pressure
NOTICE: When tesng gas pipes with
a test pressure of more than ½ psi (3.5
kPa), disconnect the gas line at the
manual shut-o valve and cap the gas
line. Do not subject the water heater’s
gas control valve or manual shut-o
valve to more than ½ psi (3.5 kPa)
pressure for any reason. If you are
pressure tesng the gas line with test
pressure of ½ psi (3.5 kPa) or less, you
may isolate the water heater from the
gas line by closing the manual shut-o
valve.
14 • Residenal Gas Water Heater Use and Care Guide
IN
REMOVE
A
MU
ST BE VERTICAL TO
IR BUBBLES
E
OUT
COIL
AIR
HANDLER
TO
AIR
HANDLER
SHUT-OFF
VALVE *
EXPANSION TANK
VACUUM
RELIEF
VALVE
COLD WATER INLET
VA
FLOW CONTROL
LV
PUMP *
SHUT-OFF
CHECK VALVE
†
(1/8” HOLE
DRILLED IN CLAPPER)
VALVE
CHECK
VALVE †
TEMP/
PRESSURE
RELIEF
VALVE
TEMPERED WATER
TO FIXTURES
(MUST MEET TEMPS LISTED
IN MASS. CODE 248 CMR †)
MIXING VALVE
(MUST BE INSTALLED BELOW
TOP OF WATER HEATER
AS PER MANUFACTURER’S
RECOMMENDATIONS)
UNION UNION
HOT
WATER
OUT
*MASSACHUSETTS INSTALLATION REQUIREMENTS:
1.) CONNECT ELECTRONICALLY-CONTROLLED TIMER TO AN ALL-BRONZE PUMP. PUMP MUST ACTIVATE EVERY 6 HOURS
FOR 60 SECONDS. TURN PUMP TIMER OFF BEFORE CLOSING PIPING LOOP SHUT-OFF VALVE.
2.) ALL WATER PIPING MUST BE INSTALLED AND INSULATED IN ACCORDANCE WITH MASSACHUSETTS CODE (248 CMR
& 780 CMR).
3.) PIPING LOOP BETWEEN WATER HEATER AND AIR HANDLER MUST BE INSTALLED IN COMPLIANCE WITH 248 CMR.
† REQUIRED FOR MASSACHUSETTS.
‡ PIPING FROM THE TOP OF THE WATER HEATER WITH TEES IS ACCEPTABLE.
WATER HEATER ACCEPTED
BY THE BOARD FOR
INSTALLATION IN
MASSACHUSETTS. †
TYPICAL MIXING VALVE INSTALLATION
COMBINATION SPACE HEATING / POTABLE WATER HEATING SYSTEM
SEE
NOTE ‡
100’-0” MAXIMUM DISTANCE
FROM WATER HEATER
TO FAN COIL AND BACK
(DEVELOPED LENGTH) NOT
INCLUDING COIL IN HEATING UNIT.
†
Figure 24 - Combuson Space Heang and Potable Water (Typical Installaon)
Some water heater models
are equipped with inlet/outlet
connecons for use with space
heang applicaons. If this water
heater is to be used to supply both
space heang and domesc potable
(drinking) water, the instrucons
listed below must be followed:
• This water heater is suitable for
combinaon water (potable) heang
and space heang and not suitable
for space heang applicaons only.
• Be sure to follow the manual(s)
shipped with the air handler system.
• This water heater is not to be used
as a replacement for an exisng
boiler installaon.
• Do not use with piping that has
been treated with chromates, boiler
seal or other chemicals and do not
add any chemicals to the water
heang piping.
• If the space heang system requires
water temperatures in excess of
120°F, install a Thermostac Mixing
Valve in the domesc (potable) hot
water supply at each point-of-use to
limit the risk of scald injury. Install
the mixing valve per its manufactur-
er’s instrucons.
• Pumps, valves, piping, and ngs
must be compable with potable
water.
• A properly installed ow control
valve is required to prevent ther-
mosiphoning. Thermosiphoning is
the result of a connuous ow of
water through the air handler circuit
during the o cycle.
• The domesc hot water line from
the water heater should be vercal
past any mixing valve or supply line
to the air handler to remove air bub-
bles from the system. Otherwise,
these bubbles will be trapped in
the air handler heat exchanger coil,
reducing eciency.
• Do not connect the water heater to
any system or components previ-
ously used with non-potable water
heang appliances when used to
supply potable water.
GETTING STARTED
GETTING STARTED
Residenal Gas Water Heater Use and Care Guide • 15
INSTALLATION
INSTALLATION
Step: 1
✓
Home is Equipped
Installing a new water heater is the
perfect me to examine your home’s
plumbing system and make sure
the system is up to current code
standards. There have likely been
plumbing code changes since the
old water heater was installed. We
recommend installing the following
accessories and any other needed
changes to bring your home up to the
latest code requirements. Updang
your plumbing system can help extend
the life of your water heater, avoid
damage to your home and property,
and reduce the risk of serious injuries
or death. Inspect your home and
install any devices you need to comply
with current codes and assure that
your new water heater performs at its
best. Check with your local plumbing
ocial for more informaon.
✓Water Pressure
Most codes allow a maximum
incoming water pressure of 80 psi
(we recommend a working pressure
no higher than 50-60 psi). Check
your home’s water pressure gauge
and adjust if necessary. High water
pressure can damage the water
heater, piping, and other appliances.
HOW: Purchase an inexpensive
water pressure gauge from your local
plumbing supplier. Connect the water
pressure gauge to an outside faucet
and measure the maximum water
pressure experienced throughout
a 24-hour period (highest water
pressures oen occur at night).
140
20
40
60
80 100 120
160
180
200
psi
AVOID FREEZING
Figure 25 - Use a Water Pressure Gauge to make
sure your home’s water pressure is not too high.
To adjust your home’s water pressure:
Locate your home’s Pressure Reducing
Valve (PRV) on the main incoming
(cold) water supply line and adjust the
water pressure control to between
50 and 60 psi. If your home does not
have a Pressure Reducing Valve, install
a PRV on the home’s main water
supply line and set it to between 50
and 60 psi. Pressure Reducing Valves
are available at your local plumbing
supplier.
Over the years,
many ulies have increased water
supply pressures so they can serve
more homes. In some homes today,
pressures can exceed 100 psi. High
water pressures can damage water
heaters, causing premature leaks.
If you have replaced toilet valves,
had a water leak, or had to repair
appliances connected to the plumbing
system, pay parcular aenon to
your home’s water pressure. When
purchasing a PRV, make sure the PRV
has a built-in bypass.
✓Water Pressure
Increase Caused
Expansion
Verify that you have a properly
sized Thermal Expansion Tank. We
recommend installing an expansion
tank if your home does not have one.
Plumbing codes require a properly
pressurized, properly sized Thermal
Expansion Tank in almost all homes.
Figure 26 - A Thermal Expansion Tank helps
protect the home’s plumbing system from
pressure spikes.
HOW: Connect the Thermal Expansion
Tank (available at your local plumbing
supplier) to the cold water supply
line near the water heater. The
expansion tank contains a bladder and
an air charge. To work properly, the
Thermal Expansion Tank must be sized
according to the water heater’s tank
capacity and pressurized to match
the home’s incoming water pressure.
Refer to the instrucons provided
with the Thermal Expansion Tank for
installaon details.
Water expands when
heated, and the increased volume
of water must have a place to go, or
thermal expansion will cause large
increases in water pressure (despite
the use of a Pressure Reducing Valve
in the home’s main water supply
line). The Safe Drinking Water Act of
16 • Residenal Gas Water Heater Use and Care Guide
1974 requires the use of backow
preventers and check valves to restrict
water from your home reentering
the public water system. Backow
preventers are oen installed in
water meters and may not be readily
visible. As a result, most all plumbing
systems today are now “closed,” and
almost all homes now need a Thermal
Expansion Tank.
A Thermal Expansion Tank is a
praccal and inexpensive way to help
avoid damage to the water heater,
washing machine, dishwasher, ice
maker, and even toilet valves. If
your toilet occasionally runs for no
apparent reason (usually briey at
night), that may be due to thermal
expansion increasing the water
pressure temporarily.
✓Water Pipe and
Drain
Drain Pan
Drain Pan
Discharge Pipe
Figure 27 - A metal drain pan piped to an
adequate drain can help protect ooring from
leaks and drips.
Leaks from plumbing pipes or from
the water heater itself can damage
property and could cause a re risk.
• Install an automac leak detecon
and shut-o device (available at
your local plumbing supplier). These
devices can detect water leaks and
can shut o the water heater’s wa-
ter supply if a leak occurs.
• Install a metal drain pan (available at
your local plumbing supplier) under
the water heater to catch conden-
saon or leaks from the piping
connecons or tank. Most codes
require, and we recommend, install-
ing the water heater in a metal drain
pan that is piped to an adequate
drain. The drain pan must be at least
two inches wider than the diameter
of the water heater. Install the drain
pan so the water level would be
limited to a maximum depth of 1-¾”.
The pan must not restrict air ow to
the burner.
✓Water Tempera
Install Thermostac Mixing Valves
to regulate the temperature of the
water supplied to each point-of-use
(for example, kitchen sink, bathroom
sink, bath, shower). Install and adjust
the mixing valve according to its
manufacturer’s instrucons.
MIX
Figure 28 - Thermostac Mixing Valves installed
at each point-of-use can help avoid scalding.
A Thermostac Mixing
Valve, installed at each point-of-use,
mixes hot water from the water
heater with cold water to more
precisely regulate the temperature of
hot water supplied to xtures. If you
are not sure if your plumbing system
is equipped with properly installed
and adjusted Thermostac Mixing
Valves at each point where hot water
is used, contact a qualied person.
INSTALLATION
INSTALLATION
Residenal Gas Water Heater Use and Care Guide • 17
INSTALLATION
INSTALLATION
Step: 2
is Appropriate
WARNING! Do not store or use
Before installing your water heater,
ensure that it will be located:
• Indoors in an area with adequate air
supply.
• In an area that will not freeze.
• In a locaon as close to a wall as
praccable and as centralized with
the water piping system as possible.
• In a metal drain pan piped to an ad-
equate oor drain or external to the
building (Figure 36 on page 19).
• In an area with adequate space
(clearances) for periodic servicing.
There must be a minimum of 5-1/2
inches of front clearance, however,
24 inches of clearance is recom-
mended.
• In an area that allows minimum
clearances between the water
heater and combusbles. Minimum
clearances are 0 inches at the sides
and rear, 5-1/2 inches from the front
and 12 inches from the top. Mini-
mum clearances from vent piping
to combusbles is 1 inch except as
noted in Figure 9.
• On a oor that can support the
weight of a full water heater.
You will also want to follow these
guidelines while considering an
appropriate locaon:
• Do not install near air-moving devic-
es such as exhaust fans, venlaon
systems, or clothes dryers.
• Do not obtain venlang air for the
furnace/air handler from the same
space as the water heater. Ensure
that any return air ducts near the
water heater are sealed.
• Do not install in a bathroom,
bedroom, or any occupied room
normally kept closed.
• If the water heater is installed
directly on carpeng, it shall be
installed on a metal or wood panel
extending beyond the full width
and depth of the water heater by at
least 3 inches in any direcon. If the
water heater is installed in an alcove
or closet, the enre oor shall be
covered by the aforestated panel.
• If your area is prone to earthquakes,
use special straps as required by
local building codes.
NOTICE: The state of California
requires bracing, anchoring, or
strapping the water heater to avoid its
moving during an earthquake. Contact
local ulies for code requirements in
your area, visit hp://www.dsa.dgs.
ca.gov, or call 1-916-445-8100 and
request instrucons. Other locaons
may have similar requirements. Check
with your local and state authories.
• Do not install in a locaon prone to
physical damage by vehicles, ood-
ing, or other risks.
Vehicle
Stop
Drain
Drain
Pan
Figure 29 - In a garage, install a vehicle stop to
avoid water heater damage.
• Avoid locaons such as acs, upper
oors, or where leaks might damage
the structure or furnishings. Due
to the normal corrosive acon of
water, the tank will eventually leak.
To minimize property damage from
leaks, inspect and maintain your
water heater in accordance with this
manual’s instrucons. Install a metal
drain pan under the water heater
piped to an adequate drain. Inspect
the drain pan, pipes, and surround-
ing area regularly and x any leaks
found. Drain pans are available at
your local plumbing supplier. Leaks
are frequently in the plumbing sys-
tem itself and not the water heater.
Step: 3
Water Heater
1 Read each installaon step
and decide if you have the
necessary skills to install the
water heater. Only proceed if you are
comfortable you can safely perform
the work. If you are not sure, have a
qualied person perform the
installaon.
2 On the old water heater, turn
the control knob on the gas
control valve to the OFF
posion.
Mechanical Valve
P
I
L
O
T
O
N
O
F
F
T
u
r
n
TO LIGHT
/
HOLD
IGNITER
RELEASE KNO
Electronic Valve
P
I
Press down to turn
Turn to
pilot
SCALDING
RISK
INCREASES
WITH
HOTTER
WATER
HOT
LOW
PILOT
OFF
VERY
HOT
A
B
C
VAC
TO LIGHT PILOT:
PRESS
/
HOLD
KNOBIN
POSITION
PRESS
IGNITER
BUTTONUNTIL PILOT LIGHTS
RELEASEKNOB
WHENSTATUS LIGHT
BLINKS
STATUS
RED WHITE
FLAMES
STATUS
1
2
3
4
5
6
7
STATUS
LIGHT
CODE
SCALDING
RISK
INCREASES
WITH
HOTTER
WATER
HOT
LOW
PILOT
OFF
VERY
HOT
A
B
C
VAC
PRESS
PRESS
L
O
W
V
E
R
Y
H
O
T
L
O
T
L
I
G
H
T
I
N
G
A
B
C
I
P
CAUTION:
RISKOFSCALDING
INCREASESWITH
HOTTERWATER
Figure 30 - Turn gas control/temperature knob
OFF.
18 • Residenal Gas Water Heater Use and Care Guide
3 Turn the manual gas valve for
the water heater’s supply line
OFF.
4 Open a hot water faucet and
let the hot water run unl it
is cool.
Figure 31 - Let the hot water run unl it is cool.
5 Connect a garden hose to the
drain valve and place the
other end of the hose in a
drain, outside, or in buckets (sediment
in the boom of the tank may clog
the valve and prevent it from draining.
If you cannot get the tank to drain,
contact a qualied person).
6 Turn the cold water supply
valve OFF.
Figure 32 - Cold water supply in OFF posion.
7 Open the drain valve on the
water heater.
Figure 33 - Draining the old water heater.
8 Also open a hot water faucet
to help the water in the tank
drain faster.
9 When the tank is empty,
disconnect the Temperature
& Pressure (T&P) Relief Valve
discharge pipe. You may be able to
reuse the discharge pipe, but do not
reuse the old T&P Relief Valve. A new
T&P Relief Valve comes with your new
water heater.
Figure 34 - Removing the T&P Relief Valve
discharge pipe.
10 Allow the vent pipe and dra
hood to cool. Once cooled,
disconnect the vent pipe
from the dra hood. You may need to
support the vent pipe unl the new
water heater is in place.
Figure 35 - Disconnect the vent pipe from the
dra hood.
11 Disconnect the water pipes.
Many water pipes are
connected by a threaded
union which can be disconnected with
wrenches. If you must cut the water
pipes, cut the pipes close to the water
heater’s inlet and outlet connecons,
leaving the water pipes as long as
possible. If necessary, you can make
them shorter later when you install
the new water heater.
12 Conrm the manual gas valve
for the water heater’s supply
line is turned OFF. Disconnect
the gas line from the water heater’s
gas control valve and cap it.
13 Remove the old water heater.
Use an appliance dolly or
hand truck to move the water
heater.
WARNING! Use two or more
INSTALLATION
INSTALLATION
Residenal Gas Water Heater Use and Care Guide • 19
INSTALLATION
INSTALLATION
Step: 4
Water Heater
1 Completely read all
instrucons before beginning.
If you are not sure you can
safely complete the installaon, seek
assistance from any of the following
sources:
• Schedule an appointment with a
qualied person to install your water
heater.
• Call our Technical Assistance Hotline
which is listed on the water heater’s
warranty sheet.
2 Install a metal drain pan that
is piped to an adequate drain.
Drain
Drain Pan
Drain Pan
Discharge Pipe
Figure 36 - Metal drain pan piped to an ade-
quate drain.
3 Set the water heater in place
taking care not to damage
the drain pan. When installing
directly on carpet, the water heater
must be installed on a wood or metal
base that extends beyond the
dimensions of the water heater (width
and depth) by at least 3 inches in any
direcon. If the water heater is
installed on carpet in an alcove or
closet, the enre oor must be
covered by a wood or metal panel.
NOTICE: Most codes require seng
the water heater in a metal drain pan
piped to an adequate drain. The drain
pan helps avoid property damage
which may occur from condensaon
or leaks in the piping connecons or
tank. The drain pan must be at least
two inches wider than the diameter
of the water heater. Install the drain
pan so the water level is limited to a
maximum depth of 1-¾”.
4 Verify the water heater is
properly set in place. Check
that:
• There is adequate space to install
the T&P Relief Valve discharge pipe
and that it can be piped to a sep-
arate drain (and not into the drain
pan, unless otherwise allowed by
local and state codes).
• There is adequate access and space
around the water heater for future
maintenance.
• The water heater is installed ver-
cally.
Step: 5
Temperature and
Most T&P Relief Valves are pre-
installed at the factory. In some cases,
they are shipped in the carton and
must be installed in the opening
marked “T&P Relief Valve” and
according to local codes.
Figure 37 - Temperature and Pressure Relief
Valve
If the T&P Relief Valve was not factory
installed, install the new T&P Relief
Valve that came with your water
heater. Do not reuse an old T&P
Relief Valve. Install a T&P Relief Valve
discharge pipe according to local
codes and the following guidelines:
• The discharge pipe should be at
least ¾” inside diameter and sloped
for proper drainage. Install it to
allow complete drainage of both the
T&P Relief Valve and the discharge
pipe.
20 • Residenal Gas Water Heater Use and Care Guide
• The discharge pipe must not be
smaller than the pipe size of the
T&P Relief Valve. The pipe must also
be able to withstand 250°F (121°C)
without distoron. Use only copper
or CPVC pipe. Do not use any other
type of pipe, such as PVC, iron, exi-
ble plasc pipe, or any type of hose.
Figure 38 - The T&P Relief Valve discharge pipe
must be installed properly and piped to an
adequate drain.
• Terminate the discharge pipe a
maximum of six inches above a
oor drain or outside the building.
Do not drain the discharge pipe
into the drain pan; instead pipe it
separately to an adequate drain.
In cold climates, terminate the
discharge pipe inside the building to
an adequate drain. Outside drains
could freeze and obstruct the drain
line — protect the discharge pipe
from freezing.
Dicharge
Pipe
Drain
Pipe
6.00"
MAX
Figure 39 - Temperature and Pressure Relief
Valve Discharge Pipe
• Do not place any valve or other re-
stricon between the tank and T&P
Relief Valve. Do not cap, block, plug,
or insert any valve between the T&P
Relief Valve and the end of the dis-
charge pipe. Do not insert or install
any reducer in the discharge pipe.
Step: 6
1 If one is not already installed,
install a manual shut-o valve
in the cold water line that
supplies the water heater. Install the
shut-o valve near the water heater
so that it is readily accessible. Only
use a full-ow ball or gate valve
compable with potable water.
2 Install a Thermostac Mixing
Valve at each point-of-use
(for example, kitchen sink,
bathroom sink, bath, shower) per the
valve manufacturer’s instrucons.
MIX
Figure 40 - Install Thermostac Mixing Valves at
each point where hot water will be used.
INSTALLATION
INSTALLATION
This manual suits for next models
1
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