American Standard ULN 100-76R Manual

operating, installation and
service manual
Commercial Gas Water Heater
• CA 91768
1(800) 900-9063 • [phone] • Fax [phone]
ULN 75-76, 100-83, 100-76
ULN 75-76R, 100-83R, 100-76R
RU 75-76, 100-83, 100-76
MODELS:
REV. 01 April 2013
561 New York Drive, Pomona

This water heater is equipped for one type gas only. Check the data plate near the control access panel for the correct gas. DO NOT USE THIS
WATER HEATER WITH ANY GAS OTHER THAN THE ONE LISTED ON THE DATA PLATE. Failure to use the correct
gas can cause problems which can result in DEATH, SERIOUS BODILY INJURY OR PROPERTY DAMAGE. If you have any
questions or doubts consult your gas supplier or gas company. Water heaters for bottled, propane or liquefied petroleum gas (LPG) are different
from natural gas models. A natural gas heater will not function safely on bottled, propane or liquefied petroleum gas (LPG) and no attempt should
be made to convert a heater from natural gas to any other gas. An odorant is added to the gas used by this water heater.
IF YOU HAVE QUESTIONS THAT ARE NOT ANSWERED IN THE MANUAL YOU MAY CALL THE TOLL FREE NUMBER 800 900-9063
DO NOT CONTACT US BY TELEPHONE OR EMAIL FOR WARRANTY REGISTRATION. YOUR WATER HEATER
SERIAL NUMBER IS ALREADY ON FILE. THE WARRANTY IS ACTIVATED AT THE TIME OF PURCHASE. KEEP YOUR RECEIPT TO SHOW
TO SERVICE PERSON IF SERVICE IS REQUIRED.
OPERATING, INSTALLATION AND SERVICE MANUAL
STORAGE TYPE GAS WATER HEATER
WITH FLUE DAMPER AND ELECTRIC
IGNITION SYSTEM WITHOUT FAN MOTOR
REQUIRES 120V A.C. POWER SUPPLY
WARNING: If the information in these instructions is not followed exactly, a fire or
explosion may result causing property damage, personal injury or death.
-Do not store or use gasoline or other flammable 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 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.
THIS APPLIANCE SHALL NOT BE INSTALLED IN ANY LOCATION WHERE FLAMMABLE LIQUIDS OR
VAPORS ARE LIKELY TO BE PRESENT.
FLAMMABLE VAPORS MAY BE DRAWN TO THIS WATER HEATER FROM OTHER AREAS OF THE
STRUCTURE BY AIR CURRENTS.
Vapors from flammable liquids will explode and
catch fire causing death or severe burns
Do not use or store flammable products such as gasoline
solvents or adhesives in the same room or area near the water
heater.
Keep flammable products:
1. far away from heater,
2. in approved containers,
3. tightly closed and
4. out of children´s reach.
Water heater has a main burner and pilot flame.
The pilot flame:
1. is on all the time and
2. will ignite flammable vapors
Vapors:
1. cannot be seen,
2. are heavier than air,
3. go a long way on the floor and
4. can be carried from other rooms to the pilot flame
by air currents.
Water temperature over 125° F can cause severe burns instantly or death
from scalds.
Children, disabled and elderly are at highest risk of being scalded.
See instruction manual before setting temperature at water heater.
Feel water before bathing or showering.
Temperature limiting valves are available, see manual.
Installation: Do not install water heater where flammable products will be stored or used such as a garage, basement,
storage area or utility room unless the main burner and pilot flames are at least 18” above the floor. This will reduce, but not
eliminate, the risk of vapors being ignited by the main burner or pilot flame.
Read and follow water heater warnings and instructions.
If owners manual is missing, contact the retailer or manufacturer.
CAUTION: THIS WATER HEATER SHOULD NOT BE USED TO HEAT A SPA OR HOT TUB
THIS WATER HEATER SHALL NOT BE INSTALLED IN BATHROOMS, BEDROOMS, OR ANY OCCUPIED ROOM NORMALLY KEPT
CLOSED.
FLAMMABLES
FLAMMABLE VAPORS
HOT
BA
WARNING
DANGER
DANGER

TABLE OF CONTENTS
WARNINGS
WARRANTY LIMITATIONS, CONSUMER RESPONSABILITIES, PRESSUHRE BUILD-UP,
GENERAL, INSTALLATION
DRAFTHOOD LOCATION & FLUE DAMPER INSTALLATION, VENTING
WATER CONNECTIONS
GAS PIPING
TYPICAL INSTALLATION
SINGLE COMMERCIAL GAS MODEL
TOP CONNECTIONS WITH RETURN CIRCULATION
AIR SUPPLY, ALL AIR FROM INSIDE THE BUILDING
ALL AIR FROM OUTDOORS
DISCHARGE OF PURGED GASES, VENTING
INSTALLATION SAFETY WARNING L.P. UNITS, ANODES, MULTIPLE HEATER INSTALLATION
TEMPERATURE AND PRESSURE RELIEF VALVE
ELECTRICAL, JUCTION BOX, FILLING HEATER WITH WATER
INSTALLATION CHECKLIST
WIRING DIAGRAM
DAMPER OPERATION SEQUENCE, OPERATION
INSTRUCTIONS FOR CLEANING TANK, TO RETURN WATER HEATER TO OPERATION
COMBINATION SPACE HEATING /POTABLE WATER HEATING SYSTEM, VENTING SYSTEM INSPECTION
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE, HI-TEMPERATURE LIMIT,WATER TEMPERATURE REGULATION,
TEMPERATURE CONTROL
GAS PRESSURE, EMERGENCY SHUTDOWN INSTRUCTIONS, TAMPERING, MAINTENANCE
PILOT AND MAIN BURNER, WATER HEATER SOUNDS, DRAINING
COMMON COMPLAINTS
REPLACEMENT PARTS LIST
REPLACEMENT PARTS ILLUSTRATION
COMBINATION SPACE HEATING / POTABLE WATER HEATING SYSTEM
A
1
3
6
7
8
9
10
11
12
13
14
16
17
18
19
20
22
23
24
25
26
27
28
30
31
32
C D
WARNING
Read and understand instruction manual and safety
messages before installing, operating or servicing
this water heater
Failure to follow instructions and safety messages
could result in death or serious injury.
Instruction manual must remain with water heater.
DANGER Water temperature over 125°f (52°c) can cause
severe burns instantly resulting in severe injury or
death.
Children, the elderly, and the physically or mentally
disabled are at highest risk for scald injury.
Feel water before bathing or showering.
Temperature limiting valves are available.
Read instruction manual for safe temperature
setting.
WARNING
For continued protection against risk of fire:
. Do not install water heater on carpeted floor.
. Do not operate water heater if flood damaged.
Fire Hazard
WARNING
. Overheated water can cause water tank
explosion.
. Properly sized temperature and pressure relief
valve must be installed in opening provided.
Explosion Hazard
WARNING
. Before servicing the water heater, make sure the
blower assembly is unplugged or the electrical
supply to the water heater is turned “OFF”.
. Label all wires prior to disconnection when
servicing controls. Wiring error can cause
improper and dangerous operation. Verify proper
operation after servicing.
. Failure to do this could result in death, serious
bodily injury, or property damage.
CAUTION
. Do not operate water heater if flood damaged.
. Inspect and replace anode.
. Install in location with drainage.
. Fill tank with water before operation.
. Be alert for thermal expansion.
Refer to instrucion manual for installation and service.
Improper installation and use may result in property damage.
WARNING
. Install vent system in accordance with codes.
. Do not operate water heater if flood damaged.
. High altitude orifice must be installed for
operation above 7,700 feet (2,347m).
. Do not operate if soot buildup.
. Do not place chemical vapor emitting products
near water heater.
. Gas and carbon monoxide detectors are available.
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual
Breathing Hazard - Carbon Monoxide Gas
WARNING
. Do not store or use gasoline or other flammable vapors and liquids in the
vicinity of this or any other appliance.
. Avoid all ignition sources if you smell LP gas.
. Do not expose water heater control to excesive gas pressure.
. Use only gas shown on rating plate.
. Mantain required clearances to combustibles.
. Keep ignition sources away from faucets after extended period of non-use.
Read instruction manual before
installing, using or servicing
water heater.
Fire or Explosion Hazard

FAILURE TO PROVIDE AN EXPANSION TANK ON THE COLD WATER LINE ON A CLOSED SYSTEM WILL VOID THE WARRANTY ON THE
WATER HEATER.
FOR YOUR SAFETY
Do not use or store gasoline or any other flammable vapors, liquids, or materials in vicinity of this or any other appliance.
FOR YOUR SAFETY - 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.
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual.
For assistance or additional information consult a qualified installer, service agency or the gas supplier.
THIS WATER HEATER MUST BE PROPERLY AND REGULARLY MAINTAINED.
FAILURE TO DO SO WILL VOID THE WARRANTY.
Please complete the following information at the time of installation. This should be retained and presented along with the warranty in the event a
claim is necessary.
MODEL NUMBER: TYPE:
SERIAL NUMBER:
INSTALLATION ADDRESS:
THIS WATER HEATER HAS BEEN INSTALLED IN ACCORDANCE WITH THESE INSTALLATION
INSTRUCTIONS AND LOCAL CODE REQUIREMENTS ON
INSTALLER:
DATE
WARNING
WARNING
1 2
CONSUMER RESPONSIBILITIES
WARRANTY LIMITATIONS
THE MANUFACTURER OF THIS WATER HEATER WILL NOT BE RESPONSIBLE FOR TANK FAILURES OR WATER HEATER FAILURES RESULTING FROM ANY OF
THE FOLLOWING CONDITIONS AND MAY AT IT’S DISCRETIONS VOID THE WATER HEATER WARRANTY WHEN THESE CONDITIONS RESULT IN
PREMATURE FAILURES OF THE TANK OR COMPONENTS
1. INSTALLATIONS NOT COMPLYING WITH ALL LOCAL CODES.
2. FAILURES DUE TO UNDERSIZING OF THE WATER HEATER AND SUBSEQUENT EXCESSIVE BURNER FIRING.
3. BAD WATER CONDITIONS SUCH AS WELL WATER WITH EXCESSIVE MINERAL DEPOSITS. IT IS THE RESPONSABILITY OF THE INSTALLER TO TAKE WHAT EVER STEPS
ARE REQUIRED INCLUDING THE INSTALLATION OF WATER HEATER SOFTENERS, TO PREVENT EXCESSIVE LIME BUILD UP AND SUBSEQUENT METAL FATIGUE DUE TO
OVER HEATING OF THE TANK BOTTOM AND TO USE THE HAND HOLE CLEANOUT PROVIDED IN THIS WATER HEATER TO KEEP LIME DEPOSITS IN THE TANK BOTTOM
EXCEEDING FROM 2” HEIGHT.
4. INSTALLATION OF MULTIPLE WATER HEATERS IN LINE RATHER THAN PARALLEL RESULTING IN EXCESS FIRING AND/OR EXCESSIVE CONDENSATIONS ON FIRST
HEATER IN SERIES OR OUT OF BALANCE PILOT OUTAGES AND PREMATURE FAILURE OF BURNER COMPONENT PARTS WILL OCCUR.
5. FAILURE TO PROVIDE ADEQUATE COMBUSTION AIR AND A CONTAMINATED AIR OUTLET OR TO ADEQUATE PROPER VENTING RESULTING IN NEGATIVE AIR
PRESSURE DUE TO IMPROPER LOCATION OR LACK OF COMBUSTION SHOWN ON OWNERS OPERATION MANUAL AND THE INSTALLATION IN COMPLIANCE WITH
UNIFORM PLUMB CODE.
6. FAILURE TO INSTALL HEATERS TO MANUFACTURE AND BUILDING SAFETY STANDARDS WILL CAUSE PREMATURE FAILURE OF COMPONENT PARTS, HAZARDOUS
CONDITIONS AND FAILURE OF THE HEATER OR COMPONENTS CAUSED BY CHEMICALS OR SOLVENTS BEING STORED IN THE INMEDIATE VICINITY OF THE WATER
HEATER.
7. FAILURE TO PROVIDE A PROPERLY SIZED EXPANSION TANK ON THE COLD WATER LINE ON A CLOSED SYSTEM.
8. FAILURE ADEQUATE GAS SUPPLY AND PROPER PRESSURE AS OUTLINED ON OWNERS OPERATION MANUAL INSTALLED IN COMPLIANCE WITH UNIFORM PLUMBING
CODE.
9. FAILURE TO INSTALL TEMPERATURE PRESSURE RELIEF VALVE DRAIN AS PER OWNERS OPERATION MANUAL AND IN COMPLIANCE WITH UNIFORM PLUMBING CODE.
10. FAILURE TO INSTALL ELECTRIC IN COMPLIANCE TO OPERATION MANUAL AND TO NATIONAL ELECTRIC CODE.
THIS MANUAL HAS BEEN PREPARED TO ACQUALNT YOU WITH THE INSTALLATION, OPERATION AND
MAINTENANCE OF YOUR GAS WATER HEATER AND TO PROVIDE IMPORTANT SAFETY INFORMATION.
WE URGE YOU TO READ ALL INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING INSTALLATION OR
OPERATION OF YOUR WATER HEATER. KEEP THESE INSTRUCTIONS FOR FUTURE REFERENCE.
The manufacturer of this water heater will not be liable for any damages caused by failure to comply with the installation and operating instructions
outlined on the following pages. These instructions are a guide for the correct installation of your water heater. lf you lack the necessary skills
required or have difficulty following the directions, you should not proceed but get help from a qualified person for that part of the installation you
do not understand. Your gas-fired water heater is design-certified by ETL. The installation should conform with the local code or the authority
having jurisdiction, or in the absence of such, the National Gas Code. ANSI Z223.1 NFPA 54. A copy of the Code can be purchased from American
Gas Association Order Processing, 400 N. Capital St. N.W. Washington D.C. 20001 e-mail ordering: www.aga.org Fax ordering: 866-8 I6-9444.
A rating plate identifying your water heater will be found next to the gas control valve (thermostat).
The water utility supply meter may contain a check valve, back flow preventer or water pressure reducing valve. This will create a closed water
system. During the heating cycle of the water heater, the water expands creating a pressure build up in the water system. A temperature and
pressure relief valve must be installed on the water heater (150 PSI maximum pressure setting. See Temperature and Pressure Relief Valve). To
prevent the temperature and pressure relief valve from discharging hot water, loss of energy, and reduce the possible build-ip of lime on the
temperature and pressure relief valve seat.
If the water supply system contains a check valve, back flow preventer or water pressure reducing valve you will have closed
water system and the pressure will build up during the water heating cycle. The temperature and pressure relief valve on the
water heater will leak during the water heating cycle resulting in loss of energy. To prevent the build up of lime in the T&P valve
and damage to the water heater by pressure surges you must install an expansion tank on the cold water supply line. The thermal
expansion tank should have a minimum capacity of 4.5 U.S. gallons. It requires both T&P valves and expansion tanks for closed
system.
Multiple water heating system and/or a system with additional storage tank must be sized by thermal expansion tank
manufacturer.
WARNING CLOSED WATER SYSTEMS
PRESSURE BUILD-UP IN CLOSED WATER SYSTEMS

Figure 1
Figure 2
Figure 3
Clearance/Flooring- If the water heater is installed directly on carpeting, it must be installed on a metal or wood panel which extends beyond
the full width and depth of the water heater by at least 3 inches in any direction. If the water heater is installed in an alcove, the entire floor must
be covered by the panel. A minimum of 24 inches front clearance shall be provided for inspection and servicing.
This water heater may be installed in an alcove on combustible flooring with clearances from combustible materials
as shown in Figures 1 and 2.
REMEMBER: Flammable vapors may be drawn to this water heater from
other areas of the structure by air currents.
NOTE: HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT
SUBJECT TO PHYSICAL DAMAGE BY MOVING VEHICLES OR AREA
FLOODING.
Typical Installation in Residential Garages (Illustration copyright by the American
Gas Association. Used by permission of the copyright holder.)
The National Fuel Gas Code (ANSI Z223.1 /NFPA 54) 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 above
floor level and protected to avoid damage by moving vehicle. See Figure 3.
CAUTION
CLEARANCES FROM COMBUSTIBLE
CONSTRUCTION
ULN 75-76-AS, 75-76 AS-R-6,
75-76-AS-R-12
RU 75-76-AS-6, 75-76-AS-12
ULN 100-76-AS-R6, 100-76-AS-R-12
RU 100-76-AS-6, 100-76-AS-R-12
ULN 100-83-AS, 100-83-AS-R-6,
100-83-AS-R-12
RU 100-83-AS-6, 100-83-AS-12
18” 2” 6” 6”
A B C D
FRONT OPEN
CERTIFIED FOR INSTALLATION ON COMBUSTIBLE FLOOR
CERTIFIED FOR ALCOVE INSTALLATION
B
BB
D
CD
AA
Vehicle Stop
Garage
18”
43
GENERAL
INSPECT SHIPMENT: Inspect water heater for possible damage. If damaged, notify carrier immediately. Check markings on rating plate to make
certain it corresponds with your application.
Read these instructions thoroughly before proceeding with the installation of this new gas-fired water heater. If there is any difficulty understanding
all or any part of these instructions, it is recommended that a qualified service person perform the installation.
NOTICE: The manufacturer's warranty does not cover damage or injury cause 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 held liable for loss or injury resulting from the use of any unauthorized device in
conjunction with this water heater.
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. 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 local gas supplier or gas company if there are any questions.
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 label when ordering high altitude constructed water heaters.
For any questions not covered in this booklet, contact your dealer or write to us at the address shown the rating plate affixed to the front of the
water heater.
This water heater has been designed and manufactured for the express purpose of heating and storing potable water and space heating. See page
23 for space heating instructions. Any use other than this purpose will release the manufacturer from any liability or warranty claims stemming from
the issue of this product. Consult local authorities.
INSTALLATION
Location- Select a location accessible to water lines, gas supply (type identified on the rating plate), an adequate open drain, and as close as practi-
cal to a chimney or gas vent. When installed, the water heater must be level. To prevent excessive heat loss through water piping, locate the water
heater as close as practical to the areas of greatest hot water usage. Do not locate the water heater where lines could be subjected to freezing
temperatures.
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 cannot slide out
for removal when servicing.
DO NOT STORE OR USE FLAMMABLE LIQUIDS, VAPORS, OR MATERIALS IN THE VICINITY OF THIS OR ANY OTHER APPLIANCE.
CAUTION
IMPORTANT
BEFORE PROCEEDING WITH THE INSTALLATION OF THIS WATER HEATER, READ AND THOROUGHLY UNDERSTAND THESE
INSTALLATION AND OPERATION INSTRUCTIONS. IF THERE ARE ANY QUESTIONS, THIS INSTALLATION SHOULD BE PERFORMED
BY A QUALIFIED SERVICE PERSON.

CAUTION
Combustion and Ventilation Air- Provisions must be made for adequate combustion and ventilation air. Details outlining proper air supply
for various types of installation are prescribed by the National Fuel Gas Code (ANSI Z-223.1/ NFPA 54) latest edition. If the water heater is installed
in unconfined space within the building, infiltration air may be adequate for proper combustion and ventilation. Buildings of tight construction
(weather stripping, caulked, etc.) require additional air from outdoors.
If the water heater is installed in a confined space (volume is less than 50 cu. ft. per I000 BTUH 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 from the top of the enclosure and one within
12 inches of the bottom. The openings must be protected by metal louvers or 1/4" min. mesh metal screen.
The size of the openings are as follows:
1.- lf the openings communicate directly with an additional room(s) of sufficient volume, each opening shall have a minimum free area opening of 1
sq. in. per 1000 BTUH of the total input rating of all gas appliances in the confined space, but not less than 100 sq. inches.
2.- If the openings communicate directly with the outdoors or through vertical ducts with the outdoors, each opening shall have a minimum free
area of I sq. in. per 4000 of the total rating of all gas appliances in the enclosure.
3.- If the openings communicate with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq. in. per 2000 BTUH
of the total rating of all gas appliances.
The draft diverter relief opening of the water heater and the combustion air inlet must be in the same atmospheric
pressure zone. Large exhaust fans in kitchens or other locations can lower the air pressure inside an enclosure and
interfere with proper operation and venting of the water heater. In these cases, the water heater should be installed
in a separate room with combustion and ventilation air supplied directly from outdoors as previously described.
Corrosive Atmosphere- Water heater corrosion and component failure can be caused by the heating and breakdown of airborne chemical
vapors. Spray can propellants, cleaning solvents, refrigeration and air conditioning refrigerants, swimming pool chemicals, calcium and sodium
chloride, waxes, and process chemicals are typical compounds which are potentially corrosive. These materials are corrosive at very low
concentration levels with little or no odor to reveal their presence.
Products of this sort must not be stored near the water heater, nor should air which is brought in contact with the water heater contain any of these
chemicals. Flammable vapors may be drawn by air currents from other areas of the structure to this appliance. If necessary, uncontaminated air
should be obtained from remote or outside sources.
THE WARRANTY ON THIS WATER HEATER DOES NOT COVER DAMAGE CAUSED FROM OPERATION IN A CORROSIVE
ATMOSPHERE.
Water Damage/Drain Pan- The water heater should be located in an area where leakage of the tank or connections
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 HAVING A LENGTH AND WIDTH AT LEAST 3 INCHES GREATER THAN THE DIAMETER OF THE
WATER HEATER, A MAXIMUM HEIGHT OF 1-3/4 INCHES, AND BE PIPED TO AN OPEN DRAIN. DO NOT
RESTRICT THE FLOW OF COMBUSTION AIR.
Figure 4
DRAFTHOOD LOCATION
& FLUE DAMPER INSTALLATION
Vent Size Model Vent Size
DRAIN PAN INSTALLATION AND CONSTRUCTION MUST CONFORM TO LOCAL CODES AND ORDINANCES.
IF NOT INSTALLED AND OPERATED IN ACCORDANCE WITH THESE INSTRUCTIONS, UNDER NO CIRCUMSTANCES WILL THE
MANUFACTURER OF THIS WATER HEATER BE LIABLE FOR ANY WATER DAMAGE OR INJURY IN CONNECTION WITH THIS WATER
HEATER.
DAMPER CASTING
CONNECTORS
DAMPAR PLATE IN
OPEN POSITION
DRAFTHOOD
65
ULN 75-76-AS, ULN 75-76-AS-R-6, ULN 75-76-AS-R-12
ULN 100-76-AS, ULN 100-76-AS-R-6, ULN 100-76-AS-R-12
RU 75-76-AS-6, RU 75-76-AS-12
RU 100-76-AS-6, RU 100-76-AS-12
ULN 100-83-AS, ULN 100-83-AS-R-6, ULN 100-83-AS-R-12
RU 100-83-AS-6, RU-100-83-AS-12
4 in
6 in
VENTING
WARNING
This water heater may be installed as a replacement with venting that met the existing codes at the time of the
installation of the original water heater.
The installer to check the installation for venting and for spillage all around the draft hood relief opening after five minutes of operation the method
to check for flue products spillage should utilize a flame or a match, or candle or smoke or flame form another source such a cigarette or grill lighter
wand. The procedure used should be to play the flame or smoke around the perimeter of the draft hood from the outside.
If spillage is encountered, it would be manifested by smoke escaping away from the draft hood or by the flame being extinguished while outside of
the hood. Good venting would be indicated by smoke and the flames being drawn into the draft hood.
IMPORTANT NOTICE

Draft Diverter- 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.
Vent Piping- 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 National Fuel Gas Code ANSI
Z223.1/NFPA 54 latest or current or local code officials for proper application in your area.
Do not turn on electrical power to water heater until flue damper is installed and the water heater is filled with water.
Better combustion is achieved by avoiding numerous elbows in the vent piping. Horizontal piping must be sloped upward at least 1/4 inch per linear
foot of length. All connections in venting system must be securely fastened with sheet metal screws or other approved method. Check local codes
and ordinances.
Failure to install a proper venting system can result in fire, injury, or death.
WATER CONNECTIONS
Installation- Refer to Figure 5 for typical installation. Connect the hot and cold water supply to the water heater, hot to the location marked
"HOT" and cold to the location marked "COLD". Note: If making cold water connection on top, determine that the dip tube is in place. If sweat
connections are used, sweat tubing to adapter before attaching adapter to the top cold water inlet as it may contain a nonmetallic dip tube. When
making these connections, use a good grade of pipe joint compound. Be familiar with the location of the shut-off valve in the cold water line feeding
the water heater (See Figure 5). If a valve is not present, one shall be installed as shown in Figure 5.
Do not install a check valve or other device that would prevent reverse flow of water ("closed system") unless required by local codes. A closed
system will result in frequent operation of the relief valve. Provisions must be made for protection against thermal expansion in the event of a closed
system (Page 1). Warranties do not cover pressure bulges and/or deformities.
This water heater is capable of delivering high temperature hot water at any faucet in the system. Care must be taken whenever using
hot water to avoid scalding injury. Certain appliances require high temperature hot water (such as dishwashers and automatic clothes
washers). In order to prevent potential scald injury, install an anti-scald tempering valve in the water system.
CAUTION
7 8
GAS PIPING
Use clean black iron pipe or equivalent material approved by local codes and ordinances for gas piping. Install a ground-joint-union in the supply line
as close to the 'water heater as possible. A manual gas shut-off valve should be above floor level and readily accessible. A drip leg (consisting of a pipe
tee, 4 inch nipple, and a cap) should be installed as shown in Figure 5.
Make sure the gas supplied to the heater is the same type as listed on the rating plate. DO NOT ATTEMPT TO USE THIS WATER HEATER WITH
ANY GAS OTHER THAN THE TYPE LISTED ON THE RATING PLATE.
Compound used for the connection of all gas piping should be resistant to the action of liquefied petroleum (L.P.) gases. Apply pipe dope sparingly
to the male threads only. DO NOT apply pipe dope to the gas valve inlet. Make certain that no pipe dope has become lodged in the inlet screen of
the gas valve. This will restrict the flow of gas. When attachment of gas piping to gas valve inlet is made, extreme care must be taken to prevent pipe
dope from entering the gas valve inlet and to avoid excessive torque to prevent cracking of the gas valve inlet housing. The suggested maximum
torque is 31.5 ft. lbs. The manufacturer of this water heater will not be liable for any damage or injury caused as a result of a cracked gas inlet from
excessive torque.

Figure 5
T & P Relief Valve
150 PSI
Min 1/4” in rise
per linear feet
Vent Connector
Vent Sheet Metal Screws
Return Line
from service
(When Used)
Hot Water Service
Hot Water
Outlet
Hand Hole
Clean Out
Shut-Off
Valve
Expansion Tank
Use an Expansion
Tank in a closed
Water System
Discharge to an OPPEN DRAIN, DO NOT thread,
cap or plug the end of discharge line,
Discharge line should be at least ¾” ID
and pitched for proper drainage to open drain.
Drain Valve
Drip Pan with suitable drain
Shut-Off Valve
To Water Heater
Drain Spud
Tee
Drain Cock
Relief Valve
150 psi
Check Valve
Return Line from
circulating loop
PUMP
PUMP
Drip Leg and Cap (Sediment Trap)
Thermostat
Rating Plate
Manual Shut Off Valve
Ground Joint Union
Minimun 3”
Open Drain
MIN 6”
Cold Water Supply
Hot water
Shut off valve
Shut off valve
Shut off valve
Shut off valve
Bleed valve
System return
Union
Union
Expansion tank
Water supply
Back flow
preventers
PUMP
Check
Valve
Cold
Water
Inlet
STORAGE TANK
TYPICAL INSTALLATION SINGLE COMMERCIAL GAS MODEL
TOP CONNECTIONS WITH RETURN CIRCULATION
109

1211
AIR SUPPLY
Important air for combustion and ventilation must not come from a corrosive atmosphere. Any failure due to corrosive elements in the atmosphere
is excluded from warranty coverage.
The following types of installation ( not limited to the following) will require outdoor air for combustion due to chemical exposure and may reduce
but not elminate the presence of corrosive chemicals in the air.
. Beauty shops.
. Photo processing labs.
. Buildings with indoor pools
. Water heaters installed in laundry, lobby or craft rooms.
. Water heaters installed in chemical storage areas.
Combustion air must be free of acid-forming chemicals such as sulfur, fluorine, chlorine. These elements are found in aerosol sprays, detergents,
bleaches, cleaning solvents, air fresheners, paint and varnish removers, refrigerants, and many other commercial or household products. When
urned, vapors from these products form highly corrosive acid compounds.
These products should not be stored or used near the water heater or air inlet.
Combustion and ventilation air requeriments are determinated by the location of the water heater. The water heater may be located in either an
open (unconfined) area or in a confined area or small enclosure, such as a closet or small room. Confined spaces are areas with less than 50 sq.ft.
ALL AIR FROM OUTDOORS
The confined space shall be provided with two permanent openings, one commencing within 12 inches of the top and one commencing within 12
inches of the bottom of the enclosure. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely
communicate with the outdoors.
When directly communicating with the outdoors each opening shall have a minimum free area of 1 square inch per 4,000 BTU oer hour of total
input rating of all equipment in the enclosure. (Figure 7)
When communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 BTU per
hour of total input rating of all equipment in the enclosure. (figure 8)
1. When communicating with the outdoors through horizontal ducts, each duct openin shall have a minimum free area of 1 square inch per 2,000
BTU per hour of total input rating of all equipment in the enclosure. (figure9)
When ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which the connect. The minimum dimension
of the rectangular air ducts shall not be less than 3 inches. For other combustion and ventilation air openings, refer to the National Fuel Gas Code
ANSI Z223.I.*
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 shall be considered in making this determination. Each opening shall
have a minimum free area of 1 square inch per 1,000 BTU per hour of the total input rating of all gas utilization equipment in the confined space,
but not less than 100 square inches.
Figure 6
Figure 7
Figure 8

13 14
CAUTION
After completing all gas connections, check each gas connection and fitting for leaks. Use a soap and water solution or a commercial leak detector
fluid. NEVER USE MATCHES OR OPEN FLAME WHEN CHECKING FOR GAS LEAKS.
The water heater and its individual gas shut off valve must be disconnected from the gas supply piping system during any pressure testing or that
system at test pressures in excess of 1/2 psi (14" W.C.) or 3.5kPa.
The water heater must be isolated from the gas supply piping system by closing its individual manual shut-off valve during any pressure testing of the
gas supply piping system at test pressures equal to or less than 1/2 psi (l4"W.C.) or 3.5kPa.
If the gas valve is subjected to pressure exceeding 1/2 psi, the damage to the gas valve could result in an extremely
hazardous condition. If this has occurred, the gas valve must be replaced. Contact your dealer for service. It is
recommended that all service work be done by a qualified service agency
INSTALLATION SAFETY WARNING L.P. UNITS
Liquified petroleum (L.P.) gas is heavier than air and will remain at floor level if there is a leak. Basements, crawl spaces, closets and areas below
ground level will serve as pockets for accumulation of leaking gas. Before lighting, sniff at floor level.
IF YOU SMELL GAS, follow applicable instructions on Front Cover or Page 21, DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS
CORRECTED.
ANODES
This water heater is supplied with anode rods designed to extend tank life and reduce corrosion. Anodes emit a weak flow of electrical current
through the water to protect the tank. When present in "highly active" water, a "rotten egg" odor may be produced from the gases from the anodes,
mixing with the water. This is not the fault of the water heater. Chlorination of the water supply system should minimize this condition. (Consult
your telephone directory for local water treatment specialists). REMOVAL OF AN ANODE ROD WILL VOID THE WARRANTY.
MULTIPLE HEATER INSTALLATION
INSTALLATION DIAGRAMS INSTALLATIONS WHERE HEATERS ARE MANIFOLDED.
All heaters should have approximately the same input rate. To manifold a high input heater with a low input heater will result in the lower input
heater running excessively. It is preferable for all heaters to be the same model.
All heaters must be evenly spaced to provide identical number of turns, length and size of pipes in each manifold. This is absolutely necessary to
insure a balanced condition to all heaters in the installation.
NEVER OPERATE AN EMPTY OR PARTIALLY FILLED WATER HEATER
DISCHARGE OF PURGED GASES
When removing purged gases from a piping system, care should be taken to not create hazardous condition, such as discharging the gases into a
confined area or in an area which contains an ignition source.
VENT PIPE SYSTEM
The water heater must be connected to the chimney. They vent pipe from the heater to the chimney (vent connector) must be no less than the
diameter of the drafthood outlet on the heater and should slope upward to the chimney at least 1/4 inch per linear foot.
Due to great variances in installations, unforeseeable by the manufacturer of the water heater, increased size vent connectors and pipes may be
necessary for proper venting.
Consult your local utility. They willl aid you in determining the proper venting for your heater from the vent tables in the american National Stand-
ard Z223.I (NFPA 54) “National Fuel Gas Code”
There are various types of vent dampers currently available. Some of these vent dampers are certified by the Canadian Standard Association Labora-
tories. The certifications apply to the vent damper device only and do not mean they are certified for use on this water heater. The use of these
devices is not permitted by the manufacturer of this water heater.
NOTE: If the equipment room is located against an
outside wall and the air openings communicate directly
with the outdoors, each opening shall have a free area
of not less than one square inch per 4,000 BTU per
hour of the total input rating of all equipment in the
enclosure.
Illustration for Figures 6-9 copyright by the American
Gas Association. Used by permission of the copyright
holder.
MECHANICAL EXHAUSTING AND FIREPLACES
the operation of air- moving devices such as exhaust
fans, ventilation sustem, clothes dryers fireplaces, etc.
can affect the proper operation of gas utilization
equipment.
Consequently, special attention must be given to
conditions these devices may create to avoid
unsatisfactory operation of the equipment.
POTENTIAL HAZARDOUS
DOWNDRAFT OPERATION
. EXHAUST FANS
. VENTILATION SYSTEM
. CLOTHES DRYERS
. FIREPLACES
. OTHERS
Figure 9
VENTING
IMPORTANT NOTICE
This water heater may be installed as a replacement with venting that met the existing codes at the time of the
installation of the original water heater.
This water heater uses a non-direct, single-pipe vent system to remove exhaust gases created by the burning of fossil fuels. Air for combustion is
taken from the immediate water heater location or is ducted in from the outside (see “Combustion Air Supply and Ventilation”).
This water heater must be properly vented for the removal of exhaust gases to the outside atmosphere. Correct installation of the vent pipes
system is mandatory for the proper and efficient operation of this water heater and is an important factor in the life of the unit.
U.L. approved fuel gas and carbon monoxide (CO) detectors are recommended in all applications and should be installed using the manufacturer´s
instructions and local codes, rules, or regulations.
Important: If you lack the necessary skills required to properly install this venting system, you should not proceed,
but get help from a qualified service technician.

Figure 10
WARNING
INSTALLATION (Using Top Connect Only)
Hydrogen gas can be produced in a hot water system that has not been used 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 be opened for several minutes at the kitchen sink before you use any electrical appliance which is connected to the hot water system.
Do not light a cigarette, cigar or pipe. Do not smoke. If hydrogen is present, there will probably be an unusual sound such as air escaping through
the faucet as the water begins to flow. Remember, no smoking or open flame near the faucet at the time it is opened.
Typical installation showing two (2) Commercial Heaters in parallel manifold using top connect only.
Typical installation showing three (3) Commercial Heaters in parallel manifold using top connect only.
Typical installation showing four (4) Commercial Heaters in parallel manifold using top connect only.
1615
Figure 11
WARNING
TEMPERATURE AND PRESSURE RELIEF VALVE
For protection against excessive pressures and/or temperatures, a temperature and pressure relief valve must be installed in the opening marked
"temperature and pressure relief valve". A design certified by a nationally recognized testing laboratory that maintains periodic inspection of
production of listed equipment or materials, as meeting the requirements for Relief Valves and Automatic Gas Shut-off devices for Hot Water Supply
Systems, ANSI Z21 .22. Pressure rating of the valve must not exceed the working pressure shown on the rating plate of the water heater. Relief
piping must terminate 6 inches above a floor drain or external to the building. Do not thread, cap, or plug the end of this discharge line. Be certain
that no contact is made with any live electrical part. Do not connect discharge line directly to drain. (Figure 5)
To prevent bodily injury, hazard to life or damage to property, the relief valve must be allowed to discharge water in the event of excessive
temperature or pressure developing in the water heater. The function of the temperature and pressure relief valve is to discharge water in large
quantities should circumstances demand. If the discharge pipe is not directed to a drain as shown in Figure 5, or other suitable means, the water flow
may cause property damage.
The discharge line:
(1) Must not be smaller than the pipe size of the relief valve,
(2) Must not be plugged or blocked,
(3) Must be of material capable of withstanding 210°F without distortion,
(4) Must be installed so as to allow complete drainage of both the temperature
and pressure relief valve and discharge line,
(5) Must terminate at an adequate drain (Figure 5)
(6) Must not have any valve between the relief valve and the end of the discharge line.
Failure to install and maintain a new properly listed temperature and pressure
relief valve will release the manufacturer from any claim which might result from
excessive temperature or water pressure.
Do not attempt to operate this water heater with the cold water inlet valve closed. Manually operate the pressure-temperature relief
valve at least once a year. To prevent water damage, discharge line must terminate at an adequate drain. Standing clear of the outlet
(discharge water may be hot), lift and release the lever handle on the pressure-temperature relief valve to make the valve operate
freely.
If the temperature and pressure relief valve on the appliance discharges periodically, this may be due to thermal expansion in a closed
water supply system (see "Pressure Build-Up in Water System" -Page 1). Contact the water supplier or local plumbing inspector on
how to correct this situation. Do not plug the temperature and pressure relief valve.
TEMPERATURE
AND PRESSURE
RELIEF VALVE
MANUAL RELIEF
LEVER
DISCHARGE LINE TO DRAIN

INSTALLATION CHECK LIST
Before putting burner in operation
This is presented for ease of reference. It is not comprehensive. All instructions and warnings must be read and adhered to
A. HEATER LOCATION
Close to area of vent.
Indoors and protected from freezing temperatures.
Proper clearance from combustible surfaces observed and heater not installed directly on carpeted floor.
Sufficient fresh air supply for proper operation of heater.
Air supply free of corrosive elements and flammable vapors.
Provisions made to protect area from water damage.
Sufficient room to service heater.
B. WATER SUPPLY (See WATER PIPING)
Install cold water inlet valve (Figure 5)
Heater completely filled with water.
Water connection tight and free of leaks.
C. RELIEF VALVE
Install a new Temperature and Pressure Relief Valve properly and discharge line run to open drain.
Discharge line protected from freezing (Figure 5)
D. GAS SUPPLY
Gas supply same as the type of gas listed on the rating plate.
Gas line equipped with shut-off valve, union and drip leg (Figure 5).
Approved pipe joint compound used.
Soap and water solution used to check all connections and fittings for possible gas leaks.
The installer to visually determine that the main burner flames are burning correctly without lifting, floating or flashing back and
that the air
shutters should be adjusted and locked to a position that results in correct burner flame pattern (see page 14) after to turn on
water heater.
E. VENTING
Draft diverter properly installed.
Vent connector(s) securely fastened together with screws.
Vent connector(s) at least 6" from combustible material.
Check with spill test
F. ELECTRICAL
120 VAC supply.
ON-OFF switch near heater.
Cove on junction box.
G. DAMPER
Damper in place on heater flue collector outlet.
Damper plate has free movement.
1817
Figure 12
CAUTION
ELECTRICAL
120 VAC LESS THAN 5 AMPS
When installed, this appliance must be electrically grounded in accordance with local codes or in the abscence of local codes, with the National
Electrical Code, ANSI/NFPA NO. 70-Latest Edition and Canadian Electrical Code CSA #22.2.
Electrical ON-OFF control must be located near heater in accordance with local code.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. Verify
proper operation after servicing.
Refer to Page 19 Figure 13, for wiring diagram remains models.
1.- Close the heater drain valve by turning the handle to the right (clockwise). The drain valve is on the lower front of heater.
2.- Open the cold water supply valve to the heater.
3.- To insure complete filling of the tank, allow air to exit by opening the nearest hot water faucet. Allow water to run until a constant flow is
obtained. This will let air out of the heater and the piping.
TERMINAL BOARD
ELECTRONIC
CONTROLLER
IGNITER MODULETRANSFORMER
CONTROLLER
BOX COVER
CONTROL
KNOB
JUNCTION BOX
FILLING HEATER WITH WATER
Operating an empty or partially filled heater will result in damage to the tank.
4.- Check all new water piping for leaks. Repair as needed.
5.- Unit is ready to be started. Follow lighting instructions on Page 24.

Figure 13
WIRING DIAGRAM
120 V 60HZ LESS THAN 5 AMP.
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED
WITH THE APPLIANCE MUST BE REPLACED.
IT MUST BE REPLACED WITH 18 GA
STRANDED 105˚C. WIRE OR ITS EQUIVALENT.
WIRING DIAGRAM
W (NEUTRAL)
VAC VAC24
120
W O
1
2
B
BR YY
Y
DISCONNECT
POTENTIOMETER
UPPER
RELAY
LOWER
RR
B
B
B
B
24V (GND)
DAMPER
3 4
21
BK
BK
W R Y
R
W
Y
G
BK
R
=
=
=
GREEN
BLACK
RED
W
Y
O
=
=
=
WHITE
YELLOW
ORANGE
B = BLUE
BK (HOT)
G (GROUND)
W
BK
IGNITION CONTROL
HONEYWELL S8600C
N O
MV
1 2 3 4 5 6 7 8 9
MV/PV PV
24V 24V
G
G
R
B
SENSE SPARK
GAS VALVE
TRANSFORMER
HNYWL
VR8304
PV
PV/MV
MV
(GND) (BURNER) TH-V (GND) (OPT)
WARNING
OPERATION
In the standby condition (thermostat satisfied) relay contacts R1 are closed and the motor (DM) is energized, which drives the damper
vane closed. This opens the end switch '(ES) via a cam on the drive rod. When the damper is fully closed, the safety switch (N/C) contacts
(SS I) are closed by the other drive rod cover. The torsion spring is wound up. Closure of the thermostat (TH) energizes the relay coil
(R) which opens the R1 contacts. The motor is de-energized and the spring drives the damper vane to the open position, the cam opens
the safety switch contacts (SS2) and closes (SS I), and the end switch contacts (ES). Closing of the end switch energizes the control
module. When the thermostat is satisfied, it de-energizes the control module and the relay coil (R). De-energizing the relay closes the R1
contacts which energizes the motor, driving the damper vane to the closed position.
In the event of an end switch malfunction, where the contacts remain closed, the safety circuit detects this condition and disables the
damper in the open position. This is accomplished when the thermostat closes on the next call for heat, by a direct short through
contacts, (SS2), (ES), the fuse, and the thermostat. The short causes the fuse to blow, opening the motor circuit, which causes the damper
to spring open and remain open. This will disable the damper in the open position and allow the appliance to remain operational.
TO AVOID POSSIBLE INJURY. FIRE AND EXPLOSION, READ THESE PRECAUTIONS BEFORE ATTEMPTING TO LIGHT OR
RELIGHT THE PILOT. Check the rating plate near the gas control thermostat for correct gas. DO NOT USE THIS WATER HEATER
WITH ANY GAS OTHER THAN THE ONE LISTED ON THE RATING PLATE (Figure 5). Failure to use the correct gas can cause
problems which result in DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE. If you have any questions or doubts consult
your gas supplier or gas company.
Figure 14
DAMPER OPERATION SEQUENCE
SERVICE SWITCH
LEGEND
DM Damper Motor
F Fuse
TH Thermostat
ES Endswitch
CM Control Module
R Relay Coil
R1 N/C Relay Contact
R2 N/O Relay Contact
SS1 N/C Safety Switch Contact
SS2 N/O Safety Switch Contact
VOLTAGE 24 AC
L2
2
4
ES
R
SS2
324V 24V
GRN
CM
SS1
TH
M1
DM F
R1
L1
20
19

NATURAL GAS MODELS
IF YOU SMELL GAS:
1.- Open windows.
2.- Get all people out of the building.
3.- DO NOT light matches.
4.- DO NOT touch electrical switches (on or off).
5.- Extinguish any open flames.
6.- Use an outside phone and immediately call the gas company and the fire department.
Ask for instructions. Before hanging up, give your name and address.
7.- DO NOT go back into the building. If help is coming, wait for it outside of the building.
L.P. (PROPANE, BOTTLED) GAS MODELS
L.P. GAS IS HEAVIER THAN AIR
Should there be a leak in the system, the gas will settle at FLOOR LEVEL. Basements, crawl spaces, skirted areas under mobile homes
(even when ventilated), closets and areas below ground level will serve as pockets for the accumulation of gas.
BEFORE LIGHTING, sniff at FLOOR LEVEL
IF YOU SMELL GAS. FOLLOW THESE RULES:
1.- Open windows.
2.- Get all people out of the building.
3.- DO NOT light matches. Extinguish any open flame.
4.- DO NOT touch electrical switches (on or off).
5.- SHUT OFF GAS at L.P. tank outside of the building.
6.- Use an outside phone and immediately call the gas company and the fire department. Ask for instructions.
Before hanging up, give your name and address.
7.- DO NOT go back into the building. If help is coming, wait for it outside of the building.
OUT OF FUEL
When your L.P. tank runs out of fuel, turn off gas at all gas appliances including gas to pilots. After L.P. tank is refilled, all appliances
must be re-lit according to the manufacturer's instructions, Page 22.
EXPOSURE TO WATER
Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and
to replace any part of the control system and any gas control which has been under water.
2221
WARNING
DO NOT STORE OR USE ANY COMBUSTIBLE MATERIALS OR LIQUIDS, SUCH AS GASOLINE, PAINT THINNERS OR OTHER
FLAMMABLE VAPORS NEAR ANY GAS BURNING APPLIANCES. VAPORS MAY BE IGNITED BY THE PILOT OR MAIN BURNER
FLAMES. NO OBSTRUCTION SHOULD BE IN THE FLOW OF COMBUSTION AND VENTILATION AIR.
INSTRUCTIONS FOR CLEANING TANK
A clean-out procedure is provided for periodic cleaning of the tank.
1. Shut off gas supply to water heater.
2. Shut off electric supply.
3. Shut off water supply to water heater.
4. Open the nearest hot water faucet.
5. Attach hose to drain valve, and open drain valve so water can drain from water heater.
This water can be hot.
6. Remove jacket clean-out cover from jacket (4 screws). Part No. 6 on page 30
7. After the water heater has been drained, remove the hex head bolts and the plate will come loose. If necessary, tap lightly on the
outside edge.
8. After tank has cooled, remove loose scale and lime deposits from inside tank, being careful not to break glass lining.
TO RETURN WATER HEATER TO OPERATION
I. Re-install seal
2. Re-install hand hole plate, with the hex head bolts, inserting all bolts in place before beginning final tightening. Tighten bolts, rotating
on opposite sides, rather than in a continuous circular pattern.
3. Tighten water connection. Open cold water inlet valve to fill tank. When water flows in a steady even stream, close hot water faucet
previously opened.
4. Turn on gas and/or electric supply to heater.
5. Using lighting instructions located on jacket of heater, put heater into operation.
VACATION
When the heater is not to be used for extended periods of time (vacations, etc.) turn the temperature dial to its lowest setting. This
will maintain the water at relatively low temperatures with minimum energy losses and prevent the tank from freezing during cold
weather. When making adjustments to the thermostat temperature setting, refer to the section on THERMOSTAT. Also refer to
Page 15 WARNING HYDROGEN GAS.
DANGER

COMBINATION SPACE HEATING /POTABLE WATER HEATING SYSTEM
When using this heater as a source of heat for a combination space heating/potable water heating system, be sure to follow manual(s)
shipped with air handler system. Refer to figure 18 page 32. Note the following warnings:
Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system. This unit may NEVER be
connected to any existing heating system or component(s) previously used with a non-potable water heating appliance.
DO NOT use with piping that has been treated with chromates, boiler seal or other chemicals.
DO NOT add boiler treatment or any chemicals to any heat piping, since the piping contains potable water.
DO NOT use with ferrous piping. The system should be installed only with new piping that is suitable for potable water, such as
copper or polybutylene. DO NOT use with PVC piping.
DO NOT use with any pumps, valves, or fittings that are not completely compatible with potable water piping.
DO NOT use valves that may cause excessive restriction to water flow. USE FULL FLOW BALL OR GATE VALVES ONLY.
DO NOT tamper with the thermostat, gas valve, igniter control or temperature and pressure relief valve. Tampering with any of these
components is DANGEROUS and can result in property damage or severe injury. Tampering voids all warranties. Only qualified
personnel should service these components.
DO NOT use 50/50 solder in potable water lines.
IF THE SPACE HEATING system requires water temperatures in excess of 140°F, a mixing valve or other means should be installed in
the domestic (potable) hot water supply to limit the RISK OF SCALD DAMAGE.
SOME JURISDICTIONS may require a backflow preventer in the incoming cold water line to the water heater. ln such cases, the
temperature and pressure relief valve on the water heater may weep or relieve due to expansion of the heated water. A diaphragm-
type expansion tank will normally eliminate this weeping condition. Please read and follow the manufacturer's instructions for installa-
tion of such tanks.
VENTING SYSTEM INSPECTION
Check the draft hood relief opening (Figure 5) using a match flame after 15 minutes of operation. Pass the match flame around the relief
opening of the draft hood. A steady flame drawn into the opening indicates proper draft. If the flame flutters or is blown out this would
indicate spillage and corrective action must be made to the vent. (Figure 5)
At least every 3 months a visual inspection should be made of the
venting system. You should look for:
Obstructions which could cause improper venting.
Damage or deterioration which could cause improper venting or leakage of combustion products.
CONDENSATION
Whenever the heater is filled with cold water there will usually be a certain amount of condensation formed while the burner is ON.
Moisture from the products of combustion condenses on the cooler tank surfaces to produce a "sizzling" or "frying" noise. During the
winter months this condition will be more pronounced. Condensation is normal and should not be confused with a leaking tank. The
water will be noted at different times of the year and in varying quantities.
BEFORE PLACING THIS WATER HEATER IN OPERATION SEE "CONDENSATION"
ON PREVIOUS PARAGRAPH.
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
A. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand.
B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and
will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
. Do not try to light any appliance.
. Do not touch any electric 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.
C. Use only your hand to push in or turn the gas valve knob.
Never use tools. If the knob will not push in or turn by hand, don´t try to repair it, call a qualified service technician. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has
been under water.
1.- STOP! Read the safety warnings above on this label.
2.- Set the thermostat to lowest setting.
3.- Turn off all electrical power to the appliance.
4.- This appliance is equipped with an ignition device which
automatically lights the pilot. Do not try to light the pilot by hand.
5.- or models using gas valve with round control knob, turn gas
valve knob clockwise to "OFF".
5a.- For models using gas valve with red control arm, depress red
control arm and slide counterclockwise to "OFF".
6.- Wait five (5) minutes to clear out any gas. If you then smell
gas, STOP! Follow "B" in the safety information above on this
label. If you don't smell gas, go to next step.
7.- For models using gas valve with round control knob, turn gas
valve knob counterclockwise to “ON”
7a.- For models using gas valve with red control arm, slide red
control arm clockwise to "ON":
8.- Turn on all electric power to the appliance.
9.- Set thermostat to desired setting.
10.- If ignition of the pilot and main burner is not established in
approximately one minute, turn the electrical power supply to
the heater “OFF” and then back "ON". This will reset the
ignition cycle.
11.- Repeat step 10 until ignition of the pilot and main burner is
established.
12.- If the appliance will not operate, follow the instructions "To
Turn Off Gas To Appliance" and call your service technician or
gas supplier.
13.- Check all pipe connections in the gas line and at the gas valve
for gas leaks. Use a soap and water solution for this operation.
NEVER USE AN OPEN FLAME FOR THIS PURPOSE.
14.- Damper must be in open position when appliance main
burner is operating.
If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
OPERATING INSTRUCTIONS
7000 VALVE
TOP VIEW
8304 VALVE
TOP VIEW
GAS VALVE CONTROL SHOWN IN ''OFF" POSITION
Note: Gas valve Robertshaw 7010 does not have a manual "on/ off" knob
7100 VALVE
TOP VIEW
24
23

GAS PRESSURE
With the water heater in operation (main burner on), the maximum supply pressure must not exceed the specified value below, and the
minimum supply and normal manifold gas pressures are as follows:
Refer to pressure noted on the label affixed to the front of the water heater. Consult your local gas company of gas supplier if correction is
necessary.
EMERGENCY SHUTDOWN INSTRUCTIONS
Should the water heater be subjected to flood, fire, or other unusual condition, turn off gas at manual shut-off valve and water inlet valve to
heater. Refer to figure 5. Do not place water heater in operation again until it has been thoroughly checked by qualified personnel.
TAMPERING
Tampering with the thermostat, gas valve, igniter control, or temperature and pressure relief valve is DANGEROUS and voids all warranties.
Only qualified personnel should service these components
MAINTENANCE
BURN AND PILOT MAINTENANCE
At least every 3months, visually check main burner and pilot flames. Observation of the gas flame should show the burner flame to be a soft blue
with the suggestion of slight yellow tips. It is to be noted that the flame of a light color may not be a carbonizing flame.
Carbonizing flames are to be avoided and can be determined by wiping the tip of the combustion chamber when the flames is extinguished and
the combustion chamber has cooled to determine if any carbon or soot has been deposited. If the burners are dirty or clogged with lint or shoot,
the burners can be cleaned with soap and water. If sooting re-occurs, refer to common complaints, page 28 and 29.
At least every 3 months a visual inspection should be made of the venting system. You should look for:
. obstructions which could cause improper venting.
. damage or deterioration which could cause improper venting or leakage of combustion products.
WARNING
Should overheating occur or the gas fail to shut off, turn off the manual gas control valve to appliance, and call a qualified
service person to check for the cause
Supply Pressure
MAX.
10.5” W.C.
13.0” W.C.
NATURAL GAS:
L.P. GAS:
5” W.C.
11” W.C.
5” W.C.
10” W.C.
(SEE RATING PLATE)
MIN. NORMAL
Manifold Pressure
26
25
TO TURN OFF GAS TO APPLIANCE
TEMPERATURE CONTROL
Water temperatures over 125°F can cause severe bums instantly or death from scalds. Children, disabled, and elderly
are at highest risk of being scalded. Feel water before bathing or showering. Temperature limiting valves are available, and
should be installed when lower outlet temperatures are required.
HI-TEMPERATURE LIMIT
The thermostat on this water heater is equipped with a high temperature limit switch (ECO). The ECO will shut off the gas supply to the burner
and pilot in the event the water temperature exceeds 190 degrees F.
WATER TEMPERATURE REGULATION
The temperature of the water in the heater can be regulated by the setting of the temperature dial on the thermostat. To adjust the temperature
setting, remove cover and rotate dial to desired temperature setting (Fig. 15)
1.Set the thermostat to lowest setting.
2.Turn off all electrical power to the appliance if service is to be performed.
3.Turn the gas valve knob clockwise to “OFF” position.
Figure 15
TEMPERATURE
ADJUSTMENT
DIAL
KNOB
Temperature
DANGER

COMMON COMPLAINTS
CONDITION
Burner will
not ignite
Burner flame
floats-lifts off
ports
Burner flame
yellow lazy
Burner flame
too high
Flame burns
at orifice
Pilot will not
remain lit
No gas
Dirt in gas line
Pilot line clogged
Main burner line clogged
Defective thermostat
Thermostat set too low
Heater installed in confined area
Defective gas valve
High gas pressure
Orifice too large
Flue clogged
Heater installed in confined area
Cold drafts
Insufficient secondary air
Low gas pressure
Flue clogged
Main burner line clogged
Heater installed in confined area
Low gas pressure
Defective thermostat
No gas
Dirt in gas lines
Pilot line clogged
Check with utility
Replace with new thermostat
Check with utility
Notify utility-install dirt trap in gas lines
Clean-check for source of trouble & correct
Insufficient secondary air
Orifice too large
Low gas pressure
Burner surface damaged
Check with utility
Replace burner
Clear the area near the heater
Replace with correct orifice
Clear the area near the heater
Check with utility
Clean-check for source of trouble & correct
Clean-check for source of trouble & correct
Provide ventilation by use of louvers in wall or duct
Check with utility
Replace with correct orifice
Clean-check for source of trouble & correct
Provide ventilation by use of louvers in wall or duct
Check source & correct
Check with utility
Notify utility-install dirt trap in gas lines
Clean-check for source of trouble & correct
Clean-check for source of trouble & correct
Replace with new thermostat
Turn temperature dial to desired temperature
Provide ventilation by use of louvers in wall or duct
Replace with new gas valve
CAUSE REMEDY
Pilot flame
too small
Low gas pressure Check with utility
Pilot line clogged Clean-check for source of trouble & correct
Pilot line not clogged Adjust pilot
FOLLOWING IS A LIST OF THE MOST COMMON COMPLAINTS RELATED TO THE USE OF WATER HEATERS. MANY COMPLAINTS
ARE DUE TO ITEMS NOT DIRECTLY RELATED TO THE WATER HEATER. DO NOT ATTEMPT TO SERVICE THE WATER HEATER OR
PERFORM OTHER RECOMMENDATIONS ON THIS LIST UNLESS YOU ARE TRAINED AND QUALIFIED TO DO SO.
Figure 16
PILOT AND MAIN BURNER
WATER HEATER SOUNDS
I. Possible noises due to expansion and contraction of some metal parts during periods of heat-up and cool-down do not represent harmful or
dangerous conditions.
2. Sediment buildup in the tank bottom will create varying amounts of noise, and left in the tank, will cause premature tank failure.
3. Condensation causes sizzling and popping within the burner areas during heating and cooling periods and should be considered normal. See
Condensation.
DRAINING
The water should be drained if being shut down during freezing temperatures. Also, periodic draining and cleaning of sediment from the tank may
be necessary. See Page 22.
I. Turn gas valve knob clockwise to the OFF position.
2. Close the cold water inlet valve to the heater.
3. Open a nearby hot water faucet.
4. Open the heater drain valve.
5. If the heater is going to be shut down and drained for an extended period, the drain valve should be left open.
THIS WATER CAN BE HOT
WARNING
THIS WATER HEATER SHOULD NOT BE USED TO HEAT A SPA OR
HOT TUB
THIS WATER HEATER IS NOT INTENDED OR SUITED FOR USE WITH A HOT TUB OR SPA AND MAY NOT BE USED FORTHIS
PURPOSE
SERVICE MUST BE PERFORMED BY A QUALIFIED INSTALLER, SERVICE AGENCY OR GAS SUPPLIER
CAUTION
VIEW PORT WINDOW
27 28

High operating
costs
Improper calibration
Thermostat set too high
Sediment or lime in tank
Heater too small for job
Leaking faucets
Gas leaks
Wasted hot water
Long runs of exposed piping
Hot water piping in outside wall
Replace control valve
Turn temperature knob to desired temperature
Clean out sediment; Refer to page 22
Install adequate heater
Repair faucets
Check with utility - repair at once
Advice customer
Insulate piping
Insulate
CONDITION
Insufficient
hot water
Slow water
recovery
Smoking and
carbon formation
Drip from relief valve
Condensation
Combustion Odors
See Page 23
Thermostat fails to close
Low gas pressure
Orifice too small
Thermostat set too low
Heater too small for job
Leaking faucets
Wasted hot water
Long runs of exposed piping
Hot water piping in outside wall
Insufficient secondary air
Low gas pressure
Orifice too small
Thermostat set too low
Sediment or lime in tank
Heater too small for job
Wasted hot water
Clear the area near the heater
Check with utility
Replace with correct orifice
Turn temperature dial to desired temperature
Clean out sediment; Refer to Page 22
Install adequate heater
Advise customer
Excessive water pressure Use pressure reducing valve
Defective thermostat Replace with new thermostat
Flue clogged Clean-check for source of trouble & correct
Heater installed in confined area Provide ventilation by use of louvers in wall or duct
Pilot flame too large Adjust pilotPilot line not clogged
Insufficient secondary air Flue clogged Provide ventilation to heater Clean-check for source of trouble & correct
Insufficient secondary air Provide ventilation to heater
Low gas pressure Check with utility
Orifice too large Replace with correct orifice
Check with utility
Replace with correct orifice
Turn temperature dial to desired temperature
Install adequate heater
Repair faucets
Advise customer
Insulate
Insulate
CAUSE REMEDY
REPLACEMENT PARTS LIST (SEE FIGURE 17)
PARTS REPLACEMENT MUST BE PERFORMED BY A QUALIFIED INSTALLER, SERVICE AGENCY OR GAS SUPPLIER
The following parts may be ordered through your plumber, a local plumbing supply company, or direct from the factory. Parts will be shipped at
prevailing prices and will be billed accordingly. Refer to warranty for company address.
IMPORTANT: When ordering replacement parts, provide model number, serial number, type of gas, item number (from the following list),
part description, voltage and wattage (when applicable).
It is imperative that replacement of main burner orifices, pilot burner and gas valve be ordered for the gas type. Natural gas valves will be marked
with a 5.0" w.c. manifold pressure setting (see rating plate). L.P. Gas valves will be marked with a I0.0" w.c. setting.
PART NO.
1
2
3
4
5
6
7
7a
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DESCRIPTION
DRAFTHOOD
ANODE ROD
DIP TUBE
FLUE BAFFLE
P&T VALVE
HAND HOLE COVER JACKET
HAND HOLE SEAL (NOT PICTURED)
HAND HOLE PLATE
DRAIN VALVE
BURNER
PILOT SUPPLY TUBE
GAS VALVE (Emergency shut-off device)
MAIN BURNER MANIFOLD
PILOT BURNER ASSEMBLY
CONTROL BOX
CONTROL BOX COVER
POTENTIOMETER 0-6 K-OHM
TRANSFORMER 24V
TERMINAL BLOCK
THERMOSTAT MODULE
IGNITION MODULE
DAMPER HARNESS
CAPILLARY TUBE COVER
TEMPERATURE SENSOR
FLUE DAMPER
QUANT
1
2
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
29 30

REPLACEMENT PARTS ILLUSTRATION
STANDARD MODEL
SHOWN
Figure 17
11
10
12
13
14
15
16
23
17
18
19
20
22
23 24
21
1
23
4
5
6
7-7a
8
9
COMBINATION SPACE HEATING /
POTABLE WATER HEATING SYSTEM
WATER (POTABLE) HEATING AND SPACE
HEATING
NON-SCALD
TEMPERING VALVE
SUGGESTED PIPING
ARRANGEMENT FOR
TOP CONNECTIONS
TEMPERED POTABLE WATER
COLD WATER INLET
RETURN FROM
HEAT EXCHANGER
Figure 18
31 32

Notes: Notes: