American Water Heater GAS-FIRED COMMERCIAL WATER HEATER User manual

238-39387-00H REV 7/00
GAS-FIRED COMMERCIAL WATER HEATER
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 safety, convenience, and best performance, we recommend
this water heater be installed and serviced by a plumbing
professional.
INSTALLATION &
OPERATING
INSTRUCTION MANUAL
WARNING: If the information in these instructions is not
followed exactly, a fire or explosion may result causing
property damage, personal injury or death.
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.
A Spanish language version of these instructions is available by
contacting the company listed on the rating plate.
La versión espãnola de estas instructiones se puede obtener al
escrible a la fábrica cuyo nombre aparece en la placa de
especificaciones.

2
TABLE OF CONTENTS
page
GENERAL INFORMATION............................................................ 3
INSTALLATION. ............................................................................ 5
Locating The Water Heater .................................................... 5
Minimum Clearances.............................................................. 8
Venting..................................................................................... 14
Combustion Air Supply.......................................................... 16
Water Connections ................................................................. 18
Gas Connections .................................................................... 21
GENERAL OPERATION................................................................ 22
Wiring Diagrams
Standard Pilot Wiring Diagram........................................ 23
Spark Ignition Wiring Diagram. ....................................... 24
Lighting and Shutdown Instructions
Standard Pilot Models. ..................................................... 25
Spark Ignition Models. ..................................................... 26
Temperature Adjustment ....................................................... 27
Burner Flame Check............................................................... 29
MAINTENANCE ............................................................................. 30
OPERATING & TROUBLESHOOTING GUIDE............................. 34
TEMPERATURE CONTROL CHECKOUT .................................... 35
PARTS LIST & DRAWING ............................................................ 39
INSTALLATION INSTRUCTIONS FOR POTABLE WATER AND
SPACE HEATING .......................................................................... 40
NOTES ........................................................................................... 42

3
GENERAL INFORMATION
This gas-fired water heater is design certified by the American Gas
Association Laboratories under the applicable American National Standard,
Z21.10.1 or Z21.10.3 (as indicated on the rating plate), available from the
American Gas Association, 1515 Wilson Blvd., Arlington, VA 22209.
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 warranty does not cover damage or injury caused
by the use of any energy-saving devices (other than those authorized by the
manufacturer) in conjunction with this water heater. The use of unauthorized
energy-saving devices may decrease the life of the water heater and
endanger life and/or property. The manufacturer will not be liable for any
damage, injury, or loss of life resulting from alteration and/or failure to comply
with these instructions.
This water heater has been equipped for use with one type of gas only.
Compare the information provided on the rating plate, affixed to the front of
the water heater, making sure that the gas stated on the rating plate is the
same as the gas to be used.
This water heater must be installed in accordance with local codes. In the
absence of local codes, it 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).
For installations in high altitude regions, this water heater must be ordered
from the supplier to the manufacturer’s specifications for that particular
altitude. Contact the company listed on the rating plate when ordering high
altitude constructed water heaters.
This water heater has been designed and certified for the purpose of heating
potable water. The installation and use of this water heater for any purpose
other than the heating of potable water may cause damage to the water
heater, create a hazardous condition, and nullify the warranty.
General Information continued-
CAUTION
Do not attempt to use this water heater with any gas other than the type
listed on the rating plate. Do not attempt to convert this water heater
for use with a gas other than the type for which it is equipped. Failure to
use the proper gas can create an unsafe condition resulting in property
damage, bodily injury, or death. Consult your local gas supplier or gas
company if there are any questions.

4
CAUTION
Incorrect operation of this appliance may create a hazard to life and
property and will nullify the warranty.
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 components for
possible damage. DO NOT install and 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
INSTALLATION
Locating The Water Heater
This water heater shall NOT be installed in any location where gasoline
or flammable vapors are likely to be present, unless the installation is
such to eliminate the probable ignition of gasoline or flammable vapors.
The location of this water heater is of the utmost importance. Before installing
this water heater, you should 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 water lines, gas supply (type identified on the rating plate), an adequate
open drain, and a chimney or exhaust gas vent. 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.
Adequate clearances shall be provided for easy access to controls by service
personnel to enable proper cleaning, servicing, and operation of the water
heater. Under no circumstances is the front of the water heater to be placed
in a position where the burner tray assembly can not slide out for removal
when servicing.
WARNING
Water heaters are heat producing appliances. To avoid damage or injury
there shall be no materials stored against the water heater and proper care
shall be taken to avoid unnecessary contact (especially by children) with
the water heater components. UNDER NO CIRCUMSTANCES SHALL
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-
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.
WARNING
Liquefied petroleum gases/propane gas 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 telephone in another
building. 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!

7
Installation (Locating The Water Heater) continued-
Proper venting practices must be considered when selecting a location for this
water heater. For exact venting specifications, please consult the Venting
section, located on page 10, of these Installation and Operating Instructions.
This water heater must be located in an area where leakage of the tank, water
line connections, or 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
must be installed under the water heater. The drain pan must be no greater
than 1-½ inches (3.8 cm) deep and have a minimum length and width of at
least four (4) inches (10.2 cm) measured from the jacket of the water heater.
The drain pan, as described above, can be purchased from your plumbing
professional. The drain pan must be piped to an adequate drain. The piping
must be at least 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.
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 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
telephone in another building.
• Gas detectors are available. Contact your gas supplier or plumbing
professional for more information.

8
Installation continued-
Minimum Clearances
WARNING
Failure to adhere to these installation and operating instructions may
create a hazard to life and property and will nullify the warranty.
This installation shall allow access to the front of the water heater and
adequate clearance shall 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
shall be installed on top of a metal or wood panel (or equivalent) 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 shall be covered by the panel. The minimum
clearances to combustibles for this water heater are given in the tables on
pages 10 through 13. A minimum of 24 inches front clearance shall be
provided for inspection and servicing.
If it is necessary to install this water heater in an alcove on combustible
flooring with clearances from combustible materials as shown in the tables on
pages 10 through 13.
Installation (Minimum Clearances) continued-
CAUTION
The National Fuel Gas Code (ANSI Z233.1-or latest edition) and
CAN/CGA (B149.1-or latest edition), expressly prohibits the following:
a) Installation of a water heater in a bathroom, bedroom, or any
occupied room normally kept closed.
b) Installation of a water heater in a garage, unless the unit is
installed so that the burner and ignition devices are at least
eighteen (18) inches (45.8 cm) above floor level and protected
to avoid damage by a moving vehicle.

9
Figure 1
Non-Flue Damper Models and Flue Damper Models
Model Description Clearances *
Capacity
Input (BTU/hr) A
(in)
B
(in)
C
(in)
D
(in)
E
(in)
F
(in)
Sides
and
Rear
Flue or
Vent
(in)
Ceiling
(in)
(GAL) Nat. LP (in)
100 199,999
199,999
74.88 65.19 56.38 4.56 23 6 2 6 20
100 250,000
225,000
74.88 65.19 56.38 4.56 23 6 2 6 20
100 270,000
250,000
74.88 65.19 56.38 4.56 23 6 2 6 20
100 300,000
300,000
75.44 65.19 56.38 4.56 23 7 2 6 20
80 399,999
375,000
71.06 60.03 51.56 10.19 N/A 8 6 6 20
80 450,000
425,000
69.03 60.03 51.56 10.19 N/A 10 6 6 20
80 505,000
475,000
69.03 60.03 51.56 10.19 N/A 10 6 6 20
Model Description Clearances *
Capacity
Input (kW/hr) A
(m)
B
(m)
C
(m)
D
(cm)
E
(cm)
F
(cm)
Sides
and
Rear
Flue or
Vent
(cm)
Ceiling
(cm)
(Litres) Nat. LP (cm)
378.5 58.7 58.7 1.90 1.66 1.43 11.6 58.4 15.2
5.1 15.3 50.8
378.5 73.3 66.0 1.90 1.66 1.43 11.6 58.4 15.2
5.1 15.3 50.8
378.5 79.3 73.3 1.90 1.66 1.43 11.6 58.4 15.2
5.1 15.3 50.8
378.5 88.0 88.0 1.92 1.66 1.43 11.6 58.4 10.2
5.1 15.3 50.8
302.8 117.3 109.9 1.81 1.53 1.31 25.9 N/A 10.2
15.3 15.3 50.8
302.8 131.9 124.6 1.75 1.53 1.31 25.9 N/A 25.4
15.3 15.3 50.8
302.8 148.0 139.3 1.75 1.53 1.31 25.9 N/A 25.4
15.3 15.3 50.8
1. N/A - Denotes not available.
Installation (Minimum Clearances) continued-

10
Figure 2
Non-Flue Damper Models
Model Designation Clearances *
Capacity Input A B C D Sides and Flue or Ceiling
(GAL) (BTU/hr) (in.) (in.) (in.) (in.) Rear
(in.)
Vent
(in.)
(in.)
65 370,000 71.38 64.38 54.13 8 6 6 20
65 399,999
(NAT ONLY)
71.38 64.38 54.13 8 6 6 20
75 300,000 72.00 64.38 54.13 7 6 7 20
80 425,000 81.00 75.38 64.25 10 6 6 20
80 505,000 81.00 75.38 64.25 10 6 6 20
Model Designation Clearances *
Capacity Input A B C D Sides and Flue or Ceiling
(Litres) (kW/hr) (m) (m) (m) (cm) Rear
(cm)
Vent
(cm)
(cm)
246.1 108.5 1.82 1.64 1.38 20.4 15.3 15.3 50.8
246.1 117.3
(NAT ONLY)
1.82 1.64 1.38 20.4 15.3 15.3 50.8
283.9 88.0 1.83 1.64 1.38 17.8 15.3 17.8 50.8
302.8 124.6 2.06 1.92 1.64 25.4 15.3 15.3 50.8
302.8 148.0 2.06 1.92 1.64 25.4 15.3 15.3 50.8
Installation (Minimum Clearances) continued-

11
Flue Damper Models (Figure 2)
Model Designation Clearances *
Capacity Input A B C D Sides and
Flue or Ceiling
(GAL) (BTU/hr) (in.) (in.) (in.) (in.) Rear
(in.)
Vent
(in.)
(in.)
65 370,000 73.38 64.38 54.13 8 6 6 20
65 399,999
(NAT ONLY)
73.38 64.38 54.13 8 6 6 20
75 300,000 74.63 64.38 54.13 7 6 7 20
80 425,000 83.50 75.38 64.25 10 6 6 20
80 505,000 83.50 75.38 64.25 10 6 6 20
Model Designation Clearances *
Capacity Input A B C D Sides and
Flue or Ceiling
(Litres) (kW/hr) (m) (m) (m) (cm) Rear
(cm)
Vent
(cm)
(cm)
246.1 108.5 1.87 1.64 1.38 20.4 15.3 15.3 50.8
246.1 117.3
(NAT ONLY)
1.87 1.64 1.38 20.4 15.3 15.3 50.8
283.9 88.0 1.87 1.64 1.38 17.8 15.3 17.8 50.8
302.8 124.6 2.12 1.92 1.64 25.4 15.3 15.3 50.8
302.8 148.0 2.12 1.92 1.64 25.4 15.3 15.3 50.8
Figure 3
Flue Damper Models and Non-Flue Damper Models
Model Designation Clearances *
Capacity Input A B C D E Sides and Flue or Ceiling
(GAL) (BTU/hr) (in.) (in.) (in.) (in.) (in.) Rear
(in.)
Vent
(in.)
(in.)
38 155,000 51.00 43.00 34.75 33.75 6 2 6 20
Model Designation Clearances *
Capacity Input A B C D E Sides and Flue or Ceiling
(Litres) (kW/hr) (m) (m) (m) (m) (cm) Rear
(cm)
Vent
(cm)
(cm)
143.9 45.5 1.30 1.10 0.88 0.86 15.3 5.1 15.3 50.8
Installation (Minimum Clearances) continued-

12
Figure 4
Non-Flue Damper Models
Model Designation Clearances *
Capacity Input A B C D E Sides and Flue or Ceiling
(GAL) (BTU/hr) (in.) (in.) (in.) (in.) (in.) Rear
(in.)
Vent
(in.)
(in.)
80 180,000 70.13 66.25 64.38 56.00 55.13
2 6 20
80 199,999
(235,000 LP)
70.13 66.25 64.38 56.00 55.13
2 6 20
80 250,000
(235,000 LP)
70.13 66.25 64.38 56.00 55.13
2 6 20
98 199,999 81.13 77.25 75.38 67.00 66.13
2 6 20
98 250,000
(235,000 LP)
82.88 77.25 75.38 67.00 66.13
2 6 20
100 199,999 75.50 69.88 61.88 60.38 56.88
2 6 20
100 250,000 75.50 69.88 61.88 60.38 56.88
2 6 20
Model Designation Clearances *
Capacity Input A B C D E Sides and Flue or Ceiling
(Liters) (kW/hr) (m) (m) (m) (m) (m) Rear
(cm)
Vent
(cm)
(cm)
302.8 52.8 1.79 1.69 1.64 1.43 1.40 5.1 15.3 50.8
302.8 58.7
(68.9 LP)
1.79 1.69 1.64 1.43 1.40 5.1 15.3 50.8
302.8 73.3
(68.9 LP)
1.79 1.69 1.64 1.43 1.40 5.1 15.3 50.8
371.0 52.8 2.06 1.97 1.92 1.71 1.68 5.1 15.3 50.8
371.0 73.3
(68.9 LP)
2.11 1.97 1.92 1.71 1.68 5.1 15.3 50.8
378.5 52.8 1.92 1.78 1.58 1.54 1.45 5.1 15.3 50.8
378.5 73.3 1.92 1.78 1.58 1.54 1.45 5.1 15.3 50.8
Installation (Minimum Clearances) continued-

13
Flue Damper Models (Figure 4)
Model Designation Clearances *
Capacity Input A B C D E Sides and Flue or Ceiling
(GAL) (BTU/HR) (in.) (in.) (in.) (in.) (in.) Rear
(in.)
Vent
(in.)
(in.)
80 180,000 71.88 66.25 64.38 56.00 55.13
2 6 20
80 199,999
(235,000 LP)
71.88 66.25 64.38 56.00 55.13
2 6 20
80 250,000
(235,000 LP)
71.88 66.25 64.38 56.00 55.13
2 6 20
98 199,999 82.88 77.25 75.38 67.00 66.13
2 6 20
98 250,000
(235,000 LP)
82.88 77.25 75.38 67.00 66.13
2 6 20
100 199,999 75.50 69.88 61.88 60.38 56.88
2 6 20
100 250,000 75.50 69.88 61.88 60.38 56.88
2 6 20
Model Designation Clearances *
Capacity Input A B C D E Sides and Flue or Ceiling
(Liters) (kW/hr) (m) (m) (m) (m) (m) Rear
(cm)
Vent
(cm)
(cm)
302.8 52.8 1.83 1.69 1.64 1.43 1.40 5.1 15.3 50.8
302.8 58.7
(68.9 LP)
1.83 1.69 1.64 1.43 1.40 5.1 15.3 50.8
302.8 73.3
(68.9 LP)
1.83 1.69 1.64 1.43 1.40 5.1 15.3 50.8
371.0 52.8 2.11 1.97 1.92 1.71 1.68 5.1 15.3 50.8
371.0 73.3
(68.9 LP)
2.11 1.97 1.92 1.71 1.68 5.1 15.3 50.8
378.5 52.8 1.92 1.78 1.58 1.54 1.45 5.1 15.3 50.8
378.5 73.3 1.92 1.78 1.58 1.54 1.45 5.1 15.3 50.8
The following notes apply to the tables accompanying Figures 1 - 4.
1. All models with flue dampers and/or above 400,000 BTU per hour
input employ a “spark” (IID) ignition system and requires 120 volt AC
electric supply.
2. * -Denotes minimum clearances to combustible material. Some
models may have different clearances. Check the label on the front of
the water heater to verify proper installation clearances.
3. Model number may have a suffix “N” for natural gas or “X”, “P” or “L”
for liquefied petroleum (LP) gases. Some models may have “A” as a
suffix or prefix. Check the rating plate on front of the water heater for
model number verification.
Installation continued-

14
Venting
This water heater has been shipped with a draft diverter for which it was
designed with reference to the horizontal and vertical planes. If removed, the
draft diverter shall be replaced in the same position and secured to the jacket
top by the screws with which it was installed.
This water heater must be connected to a masonry chimney or venting system
approved by local codes or ordinances. The vent connector used to attach
the draft diverter outlet to the chimney or approved vent must be of the same
diameter as the draft diverter outlet or larger. For proper venting in certain
installations, a larger vent connector may be needed. Consult venting tables
in ANSI standard (Z223.1-or latest edition), National Fuel Gas Code and
CAN/CGA (B149.1 or B149.2-latest editions), or local code officials for proper
application for your area.
Flue Damper
Refer to Figure 5 and follow these instructions:
1. Remove the damper from the accompanying box shipped within the crate.
2. Locate the collector outlet on top of the water heater. Place the damper
over the collector outlet and rotate as necessary to a position in which the
damper wiring plug can be fully engaged with the connector on the side of
the water heater.
3. Remove clip which holds damper vane closed. If supplied this type of vent
damper will then open by itself.
4. Being certain that the damper vane will travel freely from the “closed” to
“open” position, secure the flue damper to the jacket top with sheet metal
screws. Note: Some dampers require an additional bracket to assure level
installation.
Installation (Venting) continued-
WARNING
The vent system must be installed properly. Failure to properly install the
vent system could result in property damage, personal injury, or death.
CAUTION
Do not turn on electrical power to water heater until flue damper is
installed and water heater is filled with water.

15
5. Connect the damper wiring plug to the connector on the side of the water
heater. Note: The plug and connector can only be engaged one way
(polarized).
6. The Lighting and Operating instructions are outlined beginning on
page 25. The damper must be in the open position when the water heater
main burner is operating (the arrow on the damper plate is in the “up”
position when open. Be certain the arrow is in a visible position when
installed).
Combustion Air Supply
CAUTION
Modification to the flue damper or the draft diverter may result in
personal injury, property damage or death. The flue damper and
draft diverter are to be placed in position and operate exactly as
stated in these instructions without modification.

16
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 flames, causing carboning or sooting of the
burners and flue tubes with possible damage to the heater.
Confined Spaces
If the water heater is installed in a confined space (volume is less than 50
ft.3/1000 BTU (15 m3/0.29 kW) per hour of the total input rating of all gas
appliances in that space), air must be supplied through two permanent
openings. One opening shall be within 12 inches (30.5 cm) from the top of the
enclosure and one within 12 inches (30.5 cm) of the bottom. The openings
must be protected by metal louvers or 1/4” (6.4 mm) min. mesh metal screen.
The size of the openings are as follows.
1. If the openings communicate directly with an additional room(s) of
sufficient volume, each opening shall have a minimum free area opening of
1 in.2/1000 BTU (2.54cm2/0.29kW) per hour of the total input rating of all
gas appliances in the confined space, but not less than 100 in.2 (254 cm2).
Installation (Combustion Air Supply) continued-
WARNING
Liquefied petroleum gases/propane gas 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 telephone in another
building. 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.

17
2. If the openings communicate with the outdoors through horizontal ducts,
each opening shall have a minimum free area of 1 in.2/2000 BTU
(2.54cm2/0.59kW) per hour of the total rating of all gas appliances in the
enclosure.
3. If the openings communicate directly with the outdoors or through vertical
ducts with the outdoors, each opening shall have a minimum free area of
1 in.2 /4000 BTU (2.54cm2/1.18kW) per hour of the total rating of all gas
appliances in the enclosure.
All Air From Inside the Building: The confined space shall be provided with
two permanent openings communicating directly with an additional room(s) of
sufficient volume so that the combined volume of all spaces meets the criteria
for an unconfined space. The total input of all gas utilization equipment
installed in the combined space shall be considered in making this
determination. Each opening shall have a minimum free area of 1 in.2/1000
BTU (2.54cm2/0.29kW) per hour of the total input rating of all gas utilization
equipment in the confined space, but not less than 100 square inches
(254cm2). One opening shall be within 12 inches (30.5 cm) of the top and one
within 12 inches (30.5 cm) of the bottom of the enclosure.
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 above under CONFINED SPACES: All Air From Outdoors or
SPECIALLY ENGINEERED INSTALLATIONS.
Specially Engineered Installations
The requirements noted under CONFINED SPACES above shall not
necessarily govern when special engineering, approved by the authority
having jurisdiction, provides an adequate supply of air for combustion,
ventilation, and dilution of flue gases.
Water Connections
CAUTION
The draft diverter relief opening of the water heater and combustion
air inlet must be in the same atmospheric pressure zone. Large
exhaust fans in kitchens and other locations can lower the air
pressure inside an enclosure and interfere with the proper operation
and venting of the water heater . In these cases, the water heater
should be installed in a separate room with the combustion and
ventilation air supplied directly from outdoors as previously
described.

18
Note: BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE
MAIN WATER SUPPLY VALVE.
After shutting off the main water supply, open a faucet to relieve the water line
pressure to prevent any water from leaking out of the pipes while making the
water connections to the water heater. After the pressure has been relieved,
close the faucet. The COLD water inlet and HOT water outlet are identified on
the top and front of the water heater. Make sure the diptube is in place before
making the cold water connection. Make the proper plumbing connections
between the water heater and the plumbing system to the house. Install a
shut-off valve in the cold water supply line.
If this water heater is installed in a closed water supply system, such as the
one having a back-flow preventer in the cold water supply, provisions shall be
made to control thermal expansion. DO NOT operate this water heater in a
closed system without provisions for controlling thermal expansion.
Warranties do not cover damages from thermal expansions such as pressure
bulges and/or deformities. Your water supplier or local plumbing inspector
should be contacted on how to control this situation
After installation of the water lines, open the main water supply valve and fill
the water heater. While the water heater is filling, open several hot water
faucets to allow air to escape from the water system. When a steady stream
of water flows through the faucets, close them and check all water
connections for possible leaks. NEVER OPERATE THE WATER HEATER
WITHOUT FIRST BEING CERTAIN IT IS FILLED WITH WATER.
WARNING
FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED
TEMPERATURE AND PRESSURE RELIEF VALVE WILL RELEASE
THE MANUFACTURER FROM ANY CLAIM WHICH MIGHT RESULT
FROM EXCESSIVE TEMPERATURE AND PRESSURES.
CAUTION
If sweat fittings are to be used, DO NOT apply heat to the nipples on top or
side of the water heater. Sweat the tubing to the adapter before fitting the
adapter to the water connections. It is imperative that heat is not applied to
the nipples containing a plastic liner.
CAUTION
Keep clear of combination temperature and pressure relief valve
discharge line outlet. The discharge may be hot enough to cause scald
injury. The water is under pressure and may splash.

19
WARNING
For protection against excessive temperatures and pressure, install
temperature and pressure protective equipment required by local codes,
but not less than a combination temperature and pressure relief valve
certified by a nationally recognized testing laboratory that maintains
periodic inspection of production of listed equipment or materials as
meeting the requirements of the Standard for Relief Valves and Automatic
Gas Shutoff Devices for Hot Water Supply Systems, ANS Z21.22 and the
Standard CAN1-4.4 Temperature, Pressure, Temperature and Pressure
Relief Valves and Vacuum Relief Valves. The combination temperature
and pressure relief valve shall be marked with a maximum set pressure
not to exceed the maximum working pressure of the water heater. The
combination temperature and pressure relief valve shall also have an
hourly rated temperature steam BTU discharge capacity not less than the
hourly rating of the water heater.
Install the combination temperature and pressure relief valve into the
opening provided and marked for this purpose on the water heater.
Note: Some models may already be equipped or supplied with a
combination temperature and pressure relief valve. Verify that the
combination temperature and pressure relief valve complies with local
codes. If the combination temperature and pressure relief valve does not
comply with local codes, replace it with one that does. Follow the
installation instructions above on this page.
Install a discharge line so that water discharged from the combination
temperature and pressure relief valve will exit within six (6) inches (15.2
cm) above, or any distance below the structural floor and cannot contact
any live electrical part. The discharge line is to be installed to allow for
complete drainage of both the combination temperature and pressure
relief valve and the discharge line. The discharge opening must not be
subjected to blockage or freezing. DO NOT thread, plug or cap the
discharge line. It is recommended that a minimum clearance of four (4)
inches (10.2 cm) be provided on the side of the water heater for servicing
and maintenance of the combination temperature and pressure relief
valve.
Do not place a valve between the combination temperature and pressure
relief valve and the tank.
Installation (Water Connections) continued-

20
This water heater can deliver scalding temperature water at any faucet in the
system. Be careful whenever using hot water to avoid scalding injury. Certain
appliances such as dishwashers and automatic clothes washers may require
increased temperature water. By setting the thermostat on this water heater
to obtain the increased temperature water required by these appliances, you
may create the potential for scald injury. To protect against injury, you should
install an anti-scald tempering valve in the water system. This valve will
reduce point of discharge temperature by mixing cold and hot water in branch
supply lines. Such valves are available from the local plumbing supplier.
Please consult with a plumbing professional. For information regarding space
heating water connections and plumbing arrangements, refer to page 40.
Gas Connections
WARNING
Hydrogen gas can be produced in an operating water heater that has
not had water drawn from the tank for a long period of time (generally
two weeks or more). Hydrogen gas is extremely flammable. To
prevent the possibility of injury under these conditions, we
recommend the hot water faucet to be open for several minutes at the
kitchen sink before you use any electrical appliance which is
connected to the hot water system. If hydrogen is present, there will
be an unusual sound such as air escaping through the pipes as hot
water begins to flow. Do not smoke or have open flame near the
faucet at the time it is open.