Bradford White TTW ULG2PV50H565N19 Service manual

238-51000-00D REV 5/18
POWER VENT GAS WATER HEATER
A Spanish language version of these instructions is available by contacting the
company listed on the rating plate.
La version espanola de estas instrucciones se puede obtener al escribirle a la
fabrica cuyo nombre aparece en la placa de especificaciones.
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 building.
•Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier's instructions.
•If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
For your family’s comfort, safety and convenience we
recommend this water heater be installed and serviced by a
plumbing professional.
INSTALLATION AND OPERATION
INSTRUCTION MANUAL
FOR YOUR SAFETY
Do not store or use gasoline or other flammable,
combustible, or corrosive vapors and liquids in the
vicinity of this or any other appliance.
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal injury, or death.

2
CONGRATULATIONS!
You have just purchased one of the finest water heaters on
the market today!
This installation, operation and instruction manual will
explain in detail the installation and maintenance of your
new Power Vent Gas Water Heater. We strongly
recommend that you contact a plumbing professional for
the installation of this water heater.
We require that you carefully read this manual, as well as
the enclosed warranty, and refer to it when questions arise.
If you have any specific questions concerning your
warranty, please consult the plumbing professional from
whom your water heater was purchased. For your records
we recommend that you write the model, serial number and
installation date of your water heater in the maintenance
section in the back of this manual.
This manual should be kept with the water heater.
Special Flammable Vapor Ignition Resistant System:
This water heater is equipped with a Flammable Vapor Ignition Resistant System. In
the event of improper usage or storage of gasoline or other flammable materials in
the location where the water heater is installed, the technology will resist ignition of
the flammable vapors outside the confines of the water heater.
The Flammable Vapor Ignition Resistant System features:
•Advanced Flame Arrestor Design.
•Flammable Vapor Sensor.
•Automatic Ignition Device.
•Sight Window to observe operation of pilot and burner.
FOR YOUR SAFETY: Activation of the Flammable Vapor Ignition Resistant System
occurs when flammable vapors are drawn into the water heater and are combusted.
If flammable vapors are detected and/or sensed:
•Do not try to light any appliance.
•Do not touch any electrical switch; Do not use any phone in your building.
•Leave the premises and immediately call the fire department from a
neighbor’s phone. Follow the fire department’s instructions.
Once the flammable vapor has been evacuated, contact your plumbing professional
or the manufacturer for further instructions. Replacement of a Flammable Vapor
Ignition Resistant System equipped water heater due to a flammable vapor
shutdown is not covered under the terms of the limited warranty.

3
TABLE OF CONTENTS page
GENERAL INFORMATION ................................................................. 4
INSTALLATION. .................................................................................. 5
Locating The Water Heater ......................................................... 5
Minimum Clearances................................................................... 8
Venting .......................................................................................... 8
Specifications for
48 Gal (181.6 L) ................................................................ 12
Vent Pipe Preparation and Joining............................................ 18
Combustion Air Supply............................................................... 20
Water Connections ...................................................................... 22
Gas Connections.......................................................................... 25
Electrical Connections ................................................................ 26
Wiring Diagram ...................................................................... 27
GENERAL OPERATION ..................................................................... 28
Lighting and Shutdown Instructions......................................... 29
Thermostat Adjustment............................................................... 30
Burner Flame Check.................................................................... 31
MAINTENANCE................................................................................... 32
TROUBLESHOOTING......................................................................... 36
PARTS LIST DRAWING...................................................................... 39
PARTS LIST......................................................................................... 39
INSTALLATION INSTRUCTIONS FOR POTABLE WATER AND
SPACE HEATING................................................................................ 40

4
GENERAL INFORMATION
This gas-fired water heater’s design is certified by CSA International under the
American National Standard Z21.10.1 and CSA 4.1-M, most current editions at
the time of manufacture. This is a category III water heater.
This water heater must be installed in accordance with local codes or, in the
absence of local codes, the National Fuel Gas Code, ANSI Z223.1-Latest
Edition) and/or in Canada CAN/CGA B149 Installation Codes (Latest Editions).
The warranty for this water heater is in effect only when the water heater is
installed, adjusted, and operated in accordance with these Installation and
Operating Instructions. The manufacturer will not be held liable for any damage
resulting from alteration and/or failure to comply with these instructions.
This water heater is not design certified for installation in a mobile home. Such
an installation may create a hazardous condition and will nullify the warranty.
Do not use this appliance if any external part to the tank has been submerged in
water. You should contact a qualified service technician to inspect the appliance
and to replace any part of the control system including the combination gas
control which has been submerged in water. See the Gas Connections section
of this manual before servicing or replacing a water heater that has had any
external part to the tank submerged in water.
CAUTION
Incorrect operation of this appliance may create a hazard to life
and property and will nullify the warranty.
WARNING
Prior to connecting the gas supply line to a gas fired water heater,
ensure that the gas supply line does not have moisture/water or
dirt/scale inside the gas line. Commonly this check is done at the
lowest point in the gas distribution system prior to gas burning
appliances.
DANGER
Do not store or use gasoline or other flammable, combustible, or
corrosive vapors and liquids in the vicinity of this or any other appliance.
IMPORTANT
Before proceeding, please inspect the water heater and its components for
possible damage. DO NOT install any water heater with damaged
components. If damage is evident then please contact the supplier where the
water heater was purchased or the manufacturer listed on the rating plate for
replacement parts.

5
General Information continued-
Make sure that you check the rating plate and combination gas control on the
water heater to be certain that the type of gas being supplied corresponds with
the marking on the rating plate and combination gas control.
A sacrificial anode(s) is used to extend tank life. Removal of any anode, except
for inspection and/or replacement, will nullify the warranty. In areas where water
is unusually active, an odor may occur at the hot water faucet due to a reaction
between the sacrificial anode and impurities in the water. If this should happen,
an alternative anode(s) may be purchased from the supplier that installed this
water heater. This will minimize the odor while protecting the tank. Additionally,
the water heater should be flushed with appropriate dissolvers to eliminate any
bacteria.
INSTALLATION
Locating The Water Heater
DO NOT install the water heater in any location where gasoline or
flammable vapors are likely to be present.
Water heaters in residential garages must be installed and located, or
protected, to avoid physical damage. For other installations refer to local
codes. In the absence of local codes, the water heater must be installed in
compliance with the National Fuel Gas Code, (ANSI Z223.1- Latest
Edition), or in Canada CAN/CGA B149.1 Natural Gas Installation Code
(Latest Edition) or CAN/CGA B149.2 Propane Installation Code (Latest
Edition).
WARNING
This product contains one or more chemicals known to the State of
California to cause cancer, birth defects, or reproductive harm.
WARNING
Water heaters are heat producing appliances. To avoid damage or
injury, do not store materials against the water heater or vent-air intake
system. Use proper care to avoid unnecessary contact (especially by
children) with the water heater and vent-air intake components. UNDER
NO CIRCUMSTANCES MUST FLAMMABLE MATERIALS, SUCH AS
GASOLINE OR PAINT THINNER BE USED OR STORED IN THE
VICINITY OF THIS WATER HEATER, VENT-AIR INTAKE SYSTEM
OR IN ANY LOCATION FROM WHICH FUMES COULD REACH THE
WATER HEATER OR VENT-AIR INTAKE SYSTEM.

6
Installation (Locating The Water Heater) continued-
The location of this water heater is of the utmost importance. Before installing
this water heater, read the installation section of these instructions. After
reading these installation and operating instructions, select a location for the
water heater where the floor is level and is easily accessible to gas and water
supply lines. DO NOT locate the water heater where water lines could be
subjected to freezing temperatures. Make sure the cold water pipes are
not located directly above the gas control so that condensate during
humid weather does not drip on the controls.
Water heater corrosion and component failure can be caused by the heating
and breakdown of airborne chemical vapors. Examples of some typical
compounds that are potentially corrosive are: spray can propellants, cleaning
solvents, refrigerator and air conditioning refrigerants, swimming pool
chemicals, calcium and sodium chloride, waxes and process chemicals. These
materials are corrosive at very low concentration levels with little or no odor to
reveal their presence. NOTE: DAMAGE TO THE WATER HEATER CAUSED
BY EXPOSURE TO CORROSIVE VAPORS IS NOT COVERED BY THE
WARRANTY. DO NOT OPERATE THE WATER HEATER IF EXPOSURE HAS
OR WILL OCCUR. DO NOT STORE ANY POTENTIALLY CORROSIVE
COMPOUNDS IN THE VICINITY OF THE WATER HEATER.
To comply with NSF requirements this water heater is to be:
a) Sealed to the floor with sealant, in a smooth and easily cleanable
way, or
b) Installed with an optional leg kit that includes legs and/or
extensions that provide a minimum clearance of 6’’ beneath the
water heater.
WARNING
Liquefied petroleum gases/propane gases are heavier than air and
will remain at floor level if there is a leak. Basements, crawl spaces,
closets, and areas below ground level will serve as pockets for
accumulation of leaking gas. Before lighting, smell all around the
appliance area for gas. Be sure to smell next to the floor.
IF YOU SMELL GAS:
•Do not try to light any appliance.
•Do not touch any electric switch; do not use any telephone in
your building.
•Immediately call your gas supplier from a neighbor’s
telephone. Follow the gas supplier’s instructions.
•If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE APPLIANCE UNTIL THE LEAKAGE IS
CORRECTED!

7
Installation (Locating The Water Heater) continued-
The water heater must be located close enough to the outside wall to keep the
venting distance within the maximum distance described in the installation
instructions. Locate the water heater as close as possible to the vent opening.
Read the venting section in this installation instruction manual before locating
the water heater.
This water heater must be located in an area where leakage of the tank or water
line connections and the combination temperature and pressure relief valve will
not result in damage to the area adjacent to the water heater or to lower floors
of the structure. When such locations cannot be avoided, a suitable drain pan
adequately piped for proper drainage must be installed under the water heater.
The pan must not restrict combustion air flow. The drain pan must have a
minimum length and width of at least 4 in. (10.2 cm) greater than the diameter
of the water heater and must not restrict proper combustion air flow to the water
heater. The drain pan, as described above, can be purchased from your
plumbing professional. The drain pan must be piped to an adequate drain. The
piping must be at least 3/4 inch (1.9 cm) in diameter and pitched for proper
drainage.
It is recommended that a minimum clearance of four (4) inches (10.2 cm) be
provided on the side of the water heater for servicing and maintenance of the
combination temperature and pressure relief valve.
This water heater MUST be installed indoors out of the wind and weather.
Note: For California installation this water heater must be braced,
anchored, or strapped to avoid falling or moving during an earthquake. See
instructions for correct installation procedures. Instructions may be
obtained from the DSA Headquarters Office: 1102 Q Street, Suite 5100,
Sacramento CA 95811.
WARNING
DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE
NOT CERTAIN OF THE FOLLOWING:
•Liquefied petroleum gases/propane gas and natural gas have
an odorant added by the gas supplier that aids in the detection
of the gas.
•Most people recognize this odor as a “sulfur” or “rotten egg”
smell.
•Other conditions, such as “odorant fade” can cause the
odorant to diminish in intensity, or “fade”, and not be as
readily detectable.
•If you have a diminished sense of smell, or are in any way
unsure of the presence of gas, immediately contact your gas
supplier from a neighbor’s telephone.
•Gas detectors are available. Contact your gas supplier, or
plumbing professional, for more information.

8
Minimum Clearances
This installation must allow access to the front of the water heater and adequate
clearance must be provided for servicing and operating this water heater. The
water heater may be installed on either a combustible or non-combustible floor.
If the water heater is to be installed directly on carpeting, it must be installed on
top of a metal or wood panel extending beyond the full width and depth of the
appliance by at least three (3) inches (7.6 cm) in any direction or, if the
appliance is to be installed in an alcove or closet, the entire floor must be
covered by the panel. The minimum clearances to combustibles for this water
heater are: zero (0) inch (0 cm) from the sides and rear, five (5) inches (12.7
cm) from the front of the jacket, zero (0) inch (0 cm) from the vent connector
and fifteen (15) inches (38.1 cm) from the jacket top. Increase distances to
provide clearance for servicing.
Venting
Figure 1 - Vent Terminal Clearances
WARNING
Failure to adhere to these installation and operating instructions
may create a hazard to life and property and will nullify the
warranty.

9
Venting continued-
Canadian
Installations1
US Installations2
A=
Clearance above grade, veranda,
porch, deck or balcony
12 inches
(30 cm)
12 inches
(30 cm)
B=
Clearance to window or door that may
be opened
12 inches
(30 cm)
4 feet (1.2 m) below or
to the side of opening;
12 inches (30 cm) above
opening
C=
Clearance to permanently closed
window
*b
*b
D=
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 2 feet (61 cm)
from the center line of the terminal
*b
*b
E=
Clearance to unventilated soffit
*b
*b
F=
Clearance to outside corner
*b
*b
G=
Clearance to inside corner
*b
*b
H=
Clearance to each side of center line
extended above meter/regulator
assembly
3 feet (91 cm)
within a height
15 feet (4.6 m)
above the
meter/regulator
assembly
*b
I=
Clearance to service regulator vent
outlet or oil tank vent
36 inches
(91 cm)
*b
J=
Clearance to non-mechanical air
supply inlet to building or the
combustion air inlet to any other
appliance
12 inches
(30 cm)
4 feet (1.2m) below or to
side of opening; 12
inches (30 cm) above
opening.
K=
Clearance to a mechanical air supply
inlet
6 feet
(1.83 m)
3 feet (91 cm) above if
within 10 feet
horizontally
L=
Clearance above paved sidewalk or
paved driveway located on public
property
7 feet
(2.13 m)†
7 feet
(2.13 m)†
M=
Clearance under a veranda, porch,
deck, or balcony
12 inches
30 cm) ‡
*b
1 In accordance with the current CAN/CGA-B149 Installation Codes.
2 In accordance with the current ANSI Z223.1-(Latest edition)/NFPA 54 National Fuel Gas Code.
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two
single-family dwellings and serves both dwellings.
‡ Permitted only if a veranda, porch, deck or balcony is fully open on a minimum of two sides beneath
the floor.
* a) A minimum clearance value determined by testing in accordance with section 2.20.
* b) ‘‘Clearance in accordance with local installation codes and the requirements of the gas supplier’’.
The vent system must terminate so that proper clearances are maintained as cited
in local codes or the latest edition of the National Fuel Gas Code, ANSI
Z223.1.73.4e and 7.8a, b as follows:
1. Do not terminate near soffit vents or crawl space or other area where condensate
or vapor could create a nuisance or hazard or cause property damage.
2. Do not terminate the exhaust vent terminal where condensate or vapor could cause
damage or could be detrimental to the operation of regulators, relief valves, or
other equipment.
3. Do not terminate the exhaust vent terminal over public area or walkways where
condensate or vapor can cause nuisance or hazard.
4. The vent shall terminate a minimum of 12” (25.4 cm) above expected snowfall level
to prevent blockage of vent termination.

10
Venting continued-
Vent pipes serving power vented appliances are classified by building codes as
“vent connectors”. Required clearances from combustible materials must be
provided in accordance with information in this manual under LOCATION OF
WATER HEATER and CLEARANCES, and with National Fuel Gas Code and
local codes.
Clearance to combustibles for all venting pipes
and terminals
For installations in the US
0” minimum
For installations in Canada
Refer to vent pipe and terminal
manufacturer’s installation instructions
for clearances to combustibles
DO NOT use the placement of insulation or other materials in the required clearance
spaces surrounding the venting to combustible material unless otherwise specified.
WARNING
Risk of carbon monoxide poisoning or fire due to joint separation
or pipe breakage.
This water heater must be properly vented and connected to an
approved vent system in good condition. DO NOT operate water heater
with the absence of an approved vent system. A clean and unobstructed
vent system is necessary to allow noxious fumes that could cause injury
or loss of life to vent safely and will contribute toward maintaining the
water heater’s efficiency. The acceptance of the venting system is
dependent upon full compliance with these installation instructions.
Venting system must not pass through rated fire separations.
The venting system must be free to expand and contract. This venting
system must be supported in accordance with these instructions.
NOTICE
For installations in Canada, field supplied vent piping must comply with
CAN/CGA B149.1 (latest edition) and be certified to the Standard For Type
BH, Class II, 65°C, Gas Venting Systems, ULC S636. Components of this
listed system shall not be interchanged with other vent systems or unlisted
pipe/fittings. All components and specified primers and cements of the
certified vent system must be from a single system manufacturer and not
intermixed with other system manufacturer’s vent system parts. The
supplied vent connector and vent termination are certified under ULC S636
and are also certified as part of the water heater. Refer to the following
tables for approved venting materials, primers, and cements. All approved
primers and cements are to be used within their marked time limitations.

11
Venting continued-
Venting System Condensation
Condensate formation does not occur in all installations of power vented
water heaters, but should be protected against on installations where
condensation can form in the venting system.
Formation of 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 distance and slope;
and product usage.
In order to effectively control condensate from adversely affecting the
mechanical components of the water heater several methods may be
employed:
1. For horizontal installations the vent pipe can be installed with a downward
slope (not less than 1/8" (3 cm)) and away from the blower.
Approved Venting Materials
For installations in the US
only
•PVC DWV (ASTM D-2665)
•PVC Sch. 40, 80, 120 (ASTM-
D1785)
•CPVC Sch. 40, 80 (ASTM-
F441)
•CPVC (ASTM D2846)
•ABS Sch. 40 DWV (ASTM
D2661)
For installations in CANADA
•ULC S636 approved PVC for
flue gas venting rated Class II,
65°C
•ULC S636 approved CPVC for
flue gas venting rated Class II,
65°C
Approved Primers and Cements
For installations in the US
only
•PVC and CPVC Primer (ASTM-
F656)
•PVC Cement (ASTM D-2564)
•CPVC Cement (ASTM F493)
•ABS Primer and Cement
(ASTM D-2235)
For installations in CANADA
•ULC S636 approved Primer and
Cement for flue gas venting
rated Class II, 65°C
NOTICE
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenosulfone) in non-metallic venting systems is prohibited, and
covering non-metallic venting with thermal insulation is prohibited.

12
Venting continued-
2. In order to prevent condensate from draining back into the blower (vertical
or horizontal runs), an optional condensate kit is available as a service part
(Condensate kit, p/n 239-45875-00). A factory supplied exhaust adapter
with drain outlet mounts directly to the blower outlet and is secured with
two hose clamps, one to the blower and the other to the vent pipe. Tubing
is provided to drain any accumulated condensate away from the water
heater and to a suitable drain. The kit comes complete with instructions for
proper installation.
Venting Specifications for:48 Gallon (181.6 L)
This water heater is a power vented appliance and is designed to vent its
products of combustion through 3’’ (7.6 cm) or 4’’ (10.2 cm) diameter
vent pipe to the outdoors. This water heater may be either vented
horizontally through the wall or vertically through the roof. Use a 3’’ (7.6
cm) to 4’’ (10.2 cm) reducer to connect to the vent outlet when using 4’’
(10.2 cm) vent pipe. Apply the proper cement at the joint locations. Table
1 lists the maximum vent lengths for this water heater using 3’’ (7.6 cm)
vent pipe. If possible, locate the water heater so that the venting length
and number of elbows are kept to the minimum distance necessary to
reach the outside. If the installation requires venting lengths that exceed
the lengths listed for 3’’ (7.6 cm) vent pipe in Table 1, then use 4’’ (10.2
cm) vent pipe for the vent connector.
Table 2 lists the venting distances allowed with 4’’ (10.2 cm) diameter
vent pipe. When venting with 4’’ (10.2 cm) vent pipe, use a 4’’ (10.2 cm)
to 3’’ (7.6 cm) reducer to exit through the building wall with 3’’ (7.6 cm)
vent pipe. Use the 3’’ (7.6 cm) vent terminal supplied with the water
heater to terminate on the outside of the building. If the length of 3’’ (7.6
cm) vent pipe needed to go through the wall is greater than 14’’ (35.5
cm), use 4’’ (10.2 cm) to go through the wall and reduce to 3’’ (7.6 cm)
vent pipe immediately after exiting the outside wall. Refer to the venting
illustrations on the following pages. Make sure the vent pipe terminal
elbow fitting is at least 1’’ (2.5 cm) away from the edge of the wall.
TABLE 1 - VENT CONNECTOR LENGTHS
FOR 3’’ (7.6 cm) DIAMETER VENT PIPE
Terminating
# of
Elbows
Maximum straight
Length ft (m)
Minimum straight
Length
ft (m)
48 gal.
Through the Wall
1
45 (13.7)
2 (.6)
Through the Wall
2
40 (12.2)
2 (.6)
Through the Wall
3
35 (10.7)
2 (.6)
Through the Wall
4
30 (9.2)
2 (.6)
Through the Roof
0
50 (15.2)
7 (2.1)
Through the Roof
1
45 (13.7)
7 (2.1)
Through the Roof
2
40 (12.2)
7 (2.1)
Through the Roof
3
35 (10.7)
7 (2.1)

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Venting continued-
TABLE 2 -VENT CONNECTOR LENGTHS
FOR 4’’ (10.2 cm) DIAMETER VENT PIPE
Terminating
# of 90°
Elbows (excl.
vent term.)
Maximum straight
Length ft (m)
Min
straight
Length
ft (m)
48 gal.
Through the Wall
1
175 (53.3)
10 (3.1)
Through the Wall
2
170 (51.8)
10 (3.1)
Through the Wall
3
165 (50.3)
10 (3.1)
Through the Wall
4
160 (48.8)
10 (3.1)
Through the Wall
5
155 (47.2)
10 (3.1)
Through the Roof
0
180 (54.9)
15 (4.6)
Through the Roof
1
175 (53.3)
15 (4.6)
Through the Roof
2
170 (51.8)
15 (4.6)
Through the Roof
3
165 (50.3)
15 (4.6)
Through the Roof
4
160 (48.8)
15 (4.6)
NOTE: When using 4” (10.2 cm) vent pipe, use a 4” (10.1 cm) to 3” (7.6 cm)
reducer and exit the building wall with 3” (7.6 cm) vent pipe using the 3”
(7.6 cm) 90°vent terminal supplied. Two 45°elbows are equivalent to one
90°elbow.
CONNECTION TO A 3” (7.6 CM) TO
4” (10.2 CM) REDUCER
CONNECTION TO 3” (7.6 CM)
VENT PIPE
Figure 2
IMPORTANT
All of the Venting connections must be leak checked with a soap and
water solution upon initial start up of the water heater. Any leaks must
be repaired before continuing operation of the water heater.

14
Venting continued-
THROUGH THE WALL VENTING: (HORIZONTAL VENTING)
Cut a 3 1/2 in. (8.9 cm) diameter hole in the wall at the point where the
vent connector is going to pass through the wall. Use the proper cement to
secure the 90° vent terminal provided with the water heater to the vent
connector. The distance between the edges of the 90° vent terminal and
the exterior wall (see Figure 3) must be 1 in. (2.5 cm). Use the proper
cement and assembly procedures to secure the vent connector joints
between the terminal and the blower outlet. Provide support brackets for
every 5 feet (1.5 m) of horizontal vent.
4” VENT INSTALLATION
3” VENT INSTALLATION
Figure 3

15
Venting continued-
THROUGH THE ROOF VENTING: (VERTICAL VENTING)
Cut the necessary holes through the roof and ceiling and install the vent
connector as shown in Figure 4. Make sure that the installation meets the
local codes and/or The National Fuel Gas Code ANSI Z223.1 (Latest
Edition) or CGA/CAN B149 Installation Code (latest edition).
Figure 4
NOTE: For installations requiring both horizontal and vertical runs, the
following rule must be followed: Total length of straight pipe (both
horizontally and vertically) must not exceed the allowable length listed in
the ‘‘Through The Wall’’ section of the table for total number of elbows
used.

16
Venting continued-
THROUGH THE WALL VENTING WITH LOW GROUND CLEARANCE:
When venting cannot exit through the wall at a height greater than or equal to
12” (30.5 cm) above the ground, or anticipated snow level, the installation must
be modified as shown below (see Figure 5). Refer to Table 3 for maximum
venting lengths using 3” (7.6 cm) vent pipe or Table 4 for maximum lengths
using 4” (10.2 cm) vent pipe.
3” VENT INSTALLATION
4” VENT INSTALLATION
Figure 5

17
Venting continued-
TABLE 3
3” (7.6 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR
LOW GROUND CLEARANCE INSTALLATIONS
Terminating
# of
Elbows
Max Straight
Length ft (m)
Min
straight
Length
ft (m)
48 gal.
(2) 90°Elbows with (1) 90°Elbow
1
30 (9.1)
5 (1.5)
(2) 90°Elbows with (1) 90°Elbow
2
25 (7.6)
5 (1.5)
(2) 90°Elbows with (1) 90°Elbow
3
20 (6.1)
5 (1.5)
(2) 90°Elbows with (1) 90°Elbow
4
15 (4.6)
5 (1.5)
TABLE 4
4” (10.2 cm) VENT CONNECTOR LENGTHS FROM INSIDE WALL FOR
LOW GROUND CLEARANCE INSTALLATIONS
Terminating (Reduce 4” to 3”)
(Reduce 10.1 cm to 7.6 cm)
# of
Elbows
Max straight
Length ft (m)
Min
straight
Length
ft (m)
48 gal.
(2) 90°Elbows with (1) 90°Elbow
1
160 (48.8)
10 (3.1)
(2) 90°Elbows with (1) 90°Elbow
2
155 (47.2)
10 (3.1)
(2) 90°Elbows with (1) 90°Elbow
3
150 (45.7)
10 (3.1)
(2) 90°Elbows with (1) 90°Elbow
4
145 (44.2)
10 (3.1)
(2) 90°Elbows with (1) 90°Elbow
5
140 (42.7)
10 (3.1)
HIGH ALTITUDE INSTALLATIONS FOR ELEVATIONS OVER 2,000
FEET (762 m) ABOVE SEA LEVEL
The capacity of the induced draft blower declines with increasing altitude
due to a reduction in the air density. In order to assure safe and reliable
performance of the water heater, contact the supplier for high altitude kit.

18
Vent Pipe Preparation and Joining
Most failures in vent systems result from improper preparation and joining
of pipe and fittings. The guidelines below must be followed when installing
the venting system. If you have any question about the application or
installation of the venting system, contact the vent pipe manufacturer,
supplier, or your plumbing professional.
1) Specific cleaners, solvents, primers and cements are available for PVC,
CPVC, and ABS pipe. Be sure these materials match the type of pipe to
be installed. The vent pipe manufacturers joining instructions must be
followed in all cases. Never use all-purpose cements, commercial glues
and adhesives or ABS cement to join PVC or CPVC pipe and fittings.
Refer to the table at the beginning of the ‘‘Venting’’ section for
approved primers and cements.
a) CLEANERS, SOLVENTS, PRIMERS AND CEMENTS ARE
FLAMMABLE. Do not store or use these materials near heat or
open flame, or in the vicinity of other appliances.
2) Use proper cutting, deburring and applicator tools to ensure proper
preparation and joining of pipe and fittings.
a) Cutting Tools
i) A square cut must be achieved with a miter box saw or pipe
cutter to ensure a proper mating with the female. If a pipe
cutter is used, the burr created at the outer edge of the pipe
must be removed.
b) Deburring Tools
i) A file, knife or plastic deburring tool can be used to remove
burrs. Burrs must be removed from the inside and outside
edges of the pipe to ensure a proper seal.
c) Applicator Tools
i) A natural bristle paintbrush or roller may be used to apply
cement. Prompt application of the cement is important due its
fast drying properties.
3) Inspection, Cleaning, Priming and Cementing
a) Inspect the pipe inside and out for dirt, dust, moisture or grease
etc. Check pipe and fittings for splits or cracks and replace if
found.
b) Clean pipe and fittings are imperative for proper joining. Following
cutting and deburring, wipe away any foreign material with a clean
dry rag. If wiping fails to thoroughly clean surfaces, chemical
cleaning is necessary.
c) Primer must be applied to the pipe surface and fitting socket with a
natural bristle brush. This serves to soften and prepare the pipe for
cementing.

19
Vent Pipe Preparation and Joining continued-
d) Cementing must be done quickly to avoid over-drying before
joining.
i) Apply one coat to the outside end of the pipe at a width
slightly greater than the depth of the socket.
ii) Apply a coat around the inside of the fitting socket.
iii) Apply a second coat around the end of the pipe.
4) Joining
a) Joints should be made immediately after cement is applied.
b) After fully inserting pipe into fitting socket, hold joint together for
about 15 to 20 seconds.
c) Remove excess cement from around pipe and fitting with a clean
rag.
d) Cement drying times may vary. Be sure to allow for the
recommended drying time before disturbing joints.
For more specific and detailed information about the above, contact the
vent pipe manufacturer, supplier, or competent professional.

20
Combustion Air Supply
Provide adequate air for combustion and ventilation. An insufficient supply of air
will cause recirculation of combustion products resulting in air contamination
that may be hazardous to life. Such a condition often will result in a yellow,
luminous burner flame, causing carbon build up or sooting of the combustion
chamber, burners, and flue tubes with possible damage to the water heater.
When an exhaust fan is installed in the same room with a water heater,
sufficient openings for air must be provided in the walls. Undersized openings
will cause air to be drawn into the room through the venting, causing
recirculation of combustion products.
Unconfined Spaces
In unconfined spaces in buildings, infiltration may be adequate to provide air for
combustion, ventilation, and dilution of flue gases. However, in buildings of tight
construction (for example, weather stripping, heavily insulated, caulked, vapor
barrier, etc.), additional air may need to be provided using the methods
described under CONFINED SPACES: All Air From Outdoors or Specially
Engineered Installations.
Confined Spaces
Confined spaces are spaces defined as having less than 50 ft.3/1000 BTU (1.4
m3/0.29 kw-hr).
WARNING
Liquefied petroleum gases/propane gases are heavier than air and will
remain at floor level if there is a leak. Basements, crawl spaces, closets
and areas below ground level will serve as pockets for accumulation of
leaking gas. Before lighting, smell all around the appliance area for gas.
Be sure to smell next to the floor.
IF YOU SMELL GAS:
•Do not try to light any appliance.
•Do not touch any electric switch; do not use any telephone in your
building.
•Immediately call your gas supplier from a neighbor’s telephone.
Follow the gas supplier’s instructions.
•If you cannot reach your gas supplier, call the fire department.
DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS CORRECTED!
IMPORTANT
The flow of combustion and ventilating air must not be obstructed.