American Water Heater 40 Gallon 38000 BTU Direct Vent Natural Gas Water Heater DVG6240S38NOV user manual

							1404  
327544-000  
 
 
 
 
  
RESIDENTIAL GAS WATER HEATERS
Installation and Operating Manual
KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE
WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.
DIRECT VENTED GAS MODELS
NOT FOR USE IN MANUFACTURED (MOBILE) HOMES
• For Your Safety •
AN ODO RANT IS ADDED TO THE GAS USED
BY THIS WATER HEATER.
ALL TECHNICAL AND WARRANTY QUESTIONS: SHOULD BE DIRECTED TO THE LOCAL DEALER FROM WHOM THE WATER HEATER WAS 
PURCHASED. IF YOU ARE UNSUCCESSFUL, PLEASE CONTACT THE COMPANY LISTED ON THE RATING PLATE ON THE WATER HEATER.
   
 
 
 
 
 
 
www.americanwaterheater.com       
						

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TABLE OF CONTENTS
SAFE INSTALLATION, USE AND SERVICE . . . . . . . . . . . 3
GENERAL SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INTRODUCTION  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
 Qualifi ed Installer Or Service Agency  . . . . . . . . . . . .  6
  Preparing For The Installation . . . . . . . . . . . . . . . . . .  6
INSTALLATION REQUIREMENTS FOR THE 
COMMONWEALTH OF MASSACHUSETTS . . . . . . . . . . . 7
TYPICAL INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . 9
  Get To Know Your Water Heater - Gas Models 
(List Referencing Figures 1-5). . . . . . . . . . . . . . . . . .  9
  Replacement Parts And Deliming Products  . . . . . .  10
  Combo Heating Inlet And Outlet Side Taps . . . . . . .  10
  High Limit Controls (Energy Cut Off) . . . . . . . . . . . .  10
 Thermostat/Water Temperature
LOCATING THE NEW WATER HEATER . . . . . . . . . . . . . 11
  Facts To Consider About The Location . . . . . . . . . . .11
  External/Internal Damage . . . . . . . . . . . . . . . . . . . . .11
  Air Requirements  . . . . . . . . . . . . . . . . . . . . . . . . . .  12
 Confi ned Space Installations. . . . . . . . . . . . . . . . . .  12
 Clearances To Combustibles
  Floors With Carpeting
  Clearance For Servicing
  Chemical Vapor Corrosion  . . . . . . . . . . . . . . . . . . .  12
  Storage Of Flammable Liquids  . . . . . . . . . . . . . . . .  13
  Insulation Blankets  . . . . . . . . . . . . . . . . . . . . . . . . .  13
  Water Piping  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
 Water Pressure
 Mixing Valves
INSTALLING THE NEW WATER HEATER  . . . . . . . . . . . 15
  Water Piping Installation  . . . . . . . . . . . . . . . . . . . . .  15
  Closed Water Systems  . . . . . . . . . . . . . . . . . . . . . .  15
  Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . .  15
  Temperature-Pressure Relief Valve. . . . . . . . . . . . .  16
  T&P Valve Discharge Pipe Requirements:
  Temperature-Pressure Relief Valve And 
Pipe Insulation
  Filling The Water Heater . . . . . . . . . . . . . . . . . . . . .  17
  Space Heating And Potable Water Systems . . . . . .  18
  Combo Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
 System Requirements
 Installation
  Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
  Sediment Trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
  High Altitude Installations  . . . . . . . . . . . . . . . . . . . .  21
  Venting  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
  Vent Terminal Clearances . . . . . . . . . . . . . . . . . . . .  22
  DV Termination Safety Cover  . . . . . . . . . . . . . . . . .  23
  Vent Connections  . . . . . . . . . . . . . . . . . . . . . . . . . .  23
  Locating Clearance Hole For Vent  . . . . . . . . . . . . .  23
  Standard Vent Arrangement  . . . . . . . . . . . . . . . . . .  23
  Vent Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
  Securing Vent Termination Assembly To 
The Exterior Wall . . . . . . . . . . . . . . . . . . . . . . . . . . .  24
  Vent Restricter Plate . . . . . . . . . . . . . . . . . . . . . . . .  24
  Uncompressing The Corrugated Tubing . . . . . . . . .  24
  Vent Connection To The Water Heater  . . . . . . . . . .  25
  Offset Vent Arrangement . . . . . . . . . . . . . . . . . . . . .  25
  Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . .  27
LIGHTING INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . 28
TEMPERATURE REGULATION  . . . . . . . . . . . . . . . . . . . 29
  Temperature Regulation  . . . . . . . . . . . . . . . . . . . . .  29
 Temperature Adjustment
  Operating The Temperature Control System. . . . . .  29
 Water Temperature Adjustment
  Operating Modes And Settings
FOR YOUR INFORMATION. . . . . . . . . . . . . . . . . . . . . . . 30
  External Damage  . . . . . . . . . . . . . . . . . . . . . . . . . .  30
  Start Up Conditions . . . . . . . . . . . . . . . . . . . . . . . . .  30
 Condensate
 Smoke/Odor
  Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . .  30
  Strange Sounds  . . . . . . . . . . . . . . . . . . . . . . . . . . .  31
  Operational Conditions  . . . . . . . . . . . . . . . . . . . . . .  31
 Smelly Water
  “Air” In Hot Water Faucets
  High Water Temperature Shut Off System
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
  Housekeeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
  Flood Damage. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  32
  Venting System Inspection  . . . . . . . . . . . . . . . . . . .  32
  Pilot And Main Burner . . . . . . . . . . . . . . . . . . . . . . .  32
  Burner Flames. . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
  Servicing The Water Heater  . . . . . . . . . . . . . . . . . .  33
  Removing And Replacing The Gas Control Valve/
Thermostat  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  33
  Removing The Gas Control Valve/Thermostat:
  Replacing The Gas Control Valve/Thermostat:
  Removing The Manifold/Burner Assembly  . . . . . . .  33
  Removing The Burner From The Manifold/Burner 
Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  34
  Natural Gas (Low Nox) & Propane (LP) Gas Burner
  Replacing The Pilot/Thermopile Assembly  . . . . . . .  34
  Replacing The Manifold/Burner Assembly  . . . . . . .  35
  Piezoelectric Igniter System  . . . . . . . . . . . . . . . . . .  36
  Testing The Igniter System  . . . . . . . . . . . . . . . . . . .  36
  Temperature-Pressure Relief Valve Test . . . . . . . . .  36
 Draining, Refi lling And Flushing  . . . . . . . . . . . . . . .  36
  To Drain The Water Heater Storage Tank
 To Refi ll The Water Heater Storage Tank
  To Flush The Water Heater Storage Tank
  Drain Valve Washer Replacement  . . . . . . . . . . . . .  37
  Anode Rod Maintenance. . . . . . . . . . . . . . . . . . . . .  37
  To Remove The Anode Rod:
  To Install The Anode Rod:
LEAKAGE CHECKPOINTS  . . . . . . . . . . . . . . . . . . . . . . . 39
  Service  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  39
REFERENCE PARTS LISTING  . . . . . . . . . . . . . . . . . . . . 40
TROUBLESHOOTING GUIDELINES. . . . . . . . . . . . . . . . 42
NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 
						

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SAFE INSTALLATION, USE AND SERVICE
Your safety and the safety of others is extremely important in the installation, use and servicing of this water heater.
Many safety-related messages and instructions have been provided in this manual and on your own water heater to warn you 
and others of a potential injury hazard. Read and obey all safety messages and instructions throughout this manual. It is very 
important that the meaning of each safety message is understood by you and others who install, use or service this water heater.
This is the safety alert symbol. It is used to alert you 
to potential personal injury hazards. Obey all safety 
messages that follow this symbol to avoid possible 
injury or death.
CAUTION used without the safety alert 
symbol indicates a potentially hazardous 
situation which, if not avoided, could 
result in property damageCAUTION indicates a potentially 
hazardous situation which, if not avoided, 
could result in minor or moderate injury. WARNING indicates a potentially 
hazardous situation which, if not avoided, 
could result in death or injury. DANGER indicates an imminently 
hazardous situation which, if not avoided, 
will result in death or injury.
CAUTION
 WARNING
 CAUTION
 DANGER
All safety messages will generally tell you about the type of hazard, what can happen if you do not follow the safety message 
and how to avoid the risk of injury.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list of substances 
known to the State of California to cause cancer, birth defects or other reproductive harm and requires businesses to warn 
of potential exposure to such substances.
This product contains a chemical known to the State of California to cause cancer, birth defects or other reproductive harm. 
This appliance can cause low level exposure to some of the substances listed in the Act.
IMPORTANT DEFINITIONS
Qualifi ed Installer: A  qualifi ed installer must have ability equivalent to a licensed tradesman in the fi elds of plumbing, 
air supply, venting and gas supply, including a thorough understanding of the requirements of the National Fuel Gas 
Code as it relates to the installation of gas fi red water heaters. The qualifi ed installer must also be familiar with the 
design features and use of fl ammable vapor ignition resistant water heaters and have a thorough understanding of this 
Installation and Operating manual.
Service Agency: A service agency also must have ability equivalent to a licensed tradesman in the fi elds of plumbing, air 
supply, venting and gas supply, including a thorough understanding of the requirements of the National Fuel Gas Code 
as it relates to the installation of gas fi red water heaters. The service agency must also have a thorough understanding 
of this Installation and Operating manual, and be able to perform repairs strictly in accordance with the service guidelines 
provided by the manufacturer.
Gas Supplier: The Natural Gas or Propane Utility or service who supplies gas for utilization by the gas burning appliances 
within this application. The gas supplier typically has responsibility for the inspection and code approval of gas piping 
up to and including the Natural Gas meter or Propane storage tank of a building. Many gas suppliers also offer service 
and inspection of appliances within the building.     
						

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GENERAL SAFETY
 
 
Read instruction manual before 
installing, using or servicing 
water heater. • Do not store or use gasoline or other flammable 
vapors and liquids in the vicinity of this water 
heater, the vent termination hood or any other 
appliance.
• Avoid all ignition sources if you smell gas.
• Do not expose water heater control to excessive 
gas pressure.
• Use only gas shown on rating plate.
• Maintain required clearances to combustibles.
• Keep ignition sources away from faucets after 
extended period of non-use.Fire or Explosion Hazard
WARNING     
						

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GENERAL SAFETY
 
 
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
• Install vent system in accordance with codes.
• Do not operate water heater if flood damaged.
• For operation above 7,700’, a high altitude 
orifice must be installed.
• Do not operate if soot buildup is present.
• Do not place chemical vapor emitting products 
near water heater or vent termination hood.
• Gas and carbon monoxide detectors are 
available.
Breathing Hazard - Carbon Monoxide Gas
WARNING
Installation: Do not install the water heater or the vent termina-
tion hood where flammable products will be stored or used.
  Vapors from flammable 
liquids may explode and 
catch fire causing death or 
severe burns.
Do not use or store 
flammable products such as 
gasoline, solvents or adhe-
sives in the same room or 
area near the water heater or 
the vent termination hood.
Keep flammable products:
1.  far away from heater,
2.  in approved containers,
3.  tightly closed and
4.  out of childrens reach.Water heater has a main 
burner and pilot. While 
operating, the pilot flame:
1.  is in continuous operation 
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 by air currents.
Flammable VaporsFLAMMBLE
DANGER  
						

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INTRODUCTION
Thank You for purchasing this water heater. Properly 
installed and maintained, it should give you years of trouble 
free service.
This water heater is suitable for potable water heating 
and space heating applications but not for space heating 
only applications.
Abbreviations found in this Installation and Operating 
manual:
• CSA - Canadian Standards Association
• ANSI - American National Standards Institute
• NFPA - National Fire Protection Association
• ASME - American Society of Mechanical Engineers
• UL - Underwriters Laboratories Inc.
• AHRI - Air Conditioning, Heating and Refrigeration 
Institute.
This gas-fi red water heater is design certifi ed by CSA 
International, under Water Heater Standard ANSI 
Z21.10.1 • CSA 4.1 (current edition).
 QUALIFIED INSTALLER OR SERVICE AGENCY
Installation and service of this water heater requires ability 
equivalent to that of a Qualifi ed Agency (as defi ned  by 
ANSI below) in the fi eld involved. Installation skills such 
as plumbing, air supply, venting, gas supply and electrical 
supply are required in addition to electrical testing skills 
when performing service.
ANSI Z223.1 2006 Sec. 3.3.83: “Qualifi ed Agency” - “Any 
individual, fi rm, corporation or company that either in 
person or through a representative is engaged in and is 
responsible for (a) the installation, testing or replacement 
of gas piping or (b) the connection, installation, testing, 
repair or servicing of appliances and equipment; that 
is experienced in such work; that is familiar with all 
precautions required and that has complied with all the 
requirements of the authority having jurisdiction.”
If you are not qualifi ed (as defi ned by ANSI above) and 
licensed or certified as required by authority having 
jurisdiction to perform a given task, do not attempt to 
perform any of the procedures described in this manual. 
If you do not understand the instructions given in this 
manual do not attempt to perform any procedures outlined 
in this manual.
   PREPARING FOR THE INSTALLATION
1.  Read the “General Safety” section of this manual 
fi rst and then entire manual carefully. If you don’t 
follow safety rules, the water heater will not operate 
properly. It could cause DEATH, SERIOUS BODILY 
INJURY AND/OR PROPERTY DAMAGE. This manual 
contains instructions for installation, operation, 
and maintenance of the gas-fi red water heater. It also contains warnings throughout the manual that 
you must read and be aware of. All warnings and 
instructions are essential to proper operation of the 
water heater and your safety. Since we cannot put 
everything on the fi rst few pages, READ ENTIRE 
MANUAL BEFORE ATTEMPTING TO INSTALL OR 
OPERATE THE WATER HEATER.
2.  The installation must conform with these instructions 
and local code authority having jurisdiction. In absence 
of local codes, installation must comply with current 
editions of the  
“National Fuel Gas Code”, ANSI 
Z223.1/NFPA 54 and  
“National Electrical Code”, 
NFPA 70. All documents are available from:
  CSA International,
8501 East Pleasant Valley Road,
Cleveland, Ohio, United States
44131-5575.
NFPA documents are also available from:
National Fire Protection Association,
1 Batterymarch Park,
Quincy, MA 02269.
3.  If after reading this manual you have any questions or 
do not understand any portion of the instructions, call 
the local gas utility or the manufacturer whose name 
appears on the rating plate.
4.  Carefully plan the place where you are going to put 
the water heater. Correct combustion, vent action, and 
vent pipe installation are very important in preventing 
death from possible carbon monoxide poisoning and 
fi res (see Figure 6). Examine the location to ensure 
the water heater complies with the “Locating The New 
Water Heater” section in this manual.
5.  NOTE: For California installation , this water heater 
must be braced, anchored, or strapped to avoid falling 
or moving during an earthquake.  Correct installation 
procedure instructions may be obtained from:
California’s Offi ce of the State Architect,
1102 Q Street, Suite 5100,
Sacramento, CA 95811.
Instructions can also be downloaded to your computer 
at www.dsa.dgs.ca.gov..
6.  Massachusetts Code requires this water heater to be 
installed In accordance with Massachusetts 248-CMR 
2.00: State Plumbing Code and 248-CMR 5.00.
7.  This product is certifi ed to comply with a maximum 
weighted average of 0.25% lead content as required 
in some areas. 
						

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INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS
COMMONWEALTH OF MASSACHUSETTS
For all side wall terminated, horizontally vented power vent, direct vent and power direct vent gas fueled water heaters 
installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned 
or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above 
fi nished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall 
be satisfi ed:
INSTALLATION OF CARBON MONOXIDE DETECTORS
At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gasfi tter shall 
observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the fl oor level where 
the gas equipment is to be installed. In addition, the installing plumber or gasfi tter shall observe that a battery operated 
or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or 
structure served by the sidewall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner 
to secure the services of qualifi ed licensed professionals for the installation of hard wired carbon monoxide detectors.
In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard 
wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent fl oor level.
In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner 
shall have a period of thirty (30) days to comply with the above requirements provided that during said thirty (30) day 
period, a battery operated carbon monoxide detector with an alarm shall be installed.
APPROVED CARBON MONOXIDE DETECTORS
Each carbon monoxide detector as required in accordance with the above provisions shall comply with NFPA 720 and 
be ANSI/ UL 2034 listed and CSA certifi ed.
SIGNAGE
A metal or plastic identifi cation plate shall be permanently mounted to the exterior of the building at a minimum height 
of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating 
appliance or equipment. The sign shall read, in print size no less than one- half (1/2) inch in size, “GAS VENT DIRECTLY 
BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
INSPECTION
The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation 
unless, upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with 
the provisions of 248 CMR 5.08(2)(a) 1 through 4.
EXEMPTIONS
The following equipment is exempt from 248 CMR 5.08(2) (a) 1 through 4:
1.  The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of 
NFPA 54 as adopted by the Board; and
2.  Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from 
the dwelling, building, or structure used in whole or in part for residential purposes.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED
When the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system 
design or venting system components with the equipment, the instructions provided by the manufacturer for installation 
of the equipment and the venting system shall include:
1.  Detailed instructions for the installation of the venting system design or the venting system components; and
2.  A complete parts list for the venting system design or venting system.
MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED
When the manufacturer of Product Approved side wall horizontally vented gas fueled equipment does not provide the 
parts for venting the fl ue gases, but identifi es “special venting systems,” the following requirements shall be satisfi ed by 
the manufacturer:
1.  The referenced “special venting system” instructions shall be included with the appliance or equipment installation 
instructions; and
2.  The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall 
include a parts list and detailed installation instructions.
A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all 
venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the 
appliance or equipment at the completion of the installation. 
						

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•   If your water heater will be installed in the Commonwealth of Massachusetts, refer to the following 
graphic during installation and during modifications to the water supply system.
IN
REMOVE A MUST BE VERTICAL TO
IR BUBBLES
E
OUT
COIL
AIR
HANDLER TO
AIR
HANDLER
SHUT-OFF
VA LV E  
*
EXPANSION TANK
VACUUM
RELIEF
VALVE
COLD WATER INLET
VA FLOW CONTROL 
LV
 PUMP 
*
SHUT-OFFCHECK VALVE †
(1/8” HOLE 
DRILLED IN CLAPPER)VALVECHECK
 VALVE †
TEMP/
PRESSURE
RELIEF
VA LV E
TEMPERED WATER
TO FIXTURES
(MUST MEET TEMPS LISTED 
IN MASS. CODE 248 CMR 
†)
MIXING VALVE
(MUST BE INSTALLED BELOW 
TOP OF WATER HEATER
AS PER MANUFACTURER’S 
RECOMMENDATIONS)
UNIONUNION
HOT
WATER
OUT
*  MASSACHUSETTS INSTALLATION REQUIREMENTS: 
  1.) CONNECT ELECTRONICALLY-CONTROLLED TIMER TO AN ALL-BRONZE PUMP.  PUMP MUST ACTIVATE  EVERY 6 HOURS  
  FOR 60 SECONDS.  TURN PUMP TIMER OFF BEFORE CLOSING PIPING LOOP SHUT-OFF VALVE.  
  2.) ALL WATER PIPING MUST BE INSTALLED AND INSULATED IN ACCORDANCE WITH MASSACHUSETTS CODE (248 CMR 
  & 780 CMR).  
  3.) PIPING LOOP BETWEEN WATER HEATER AND AIR HANDLER MUST BE INSTALLED IN COMPLIANCE WITH 248 CMR.   
†  REQUIRED FOR MASSACHUSETTS.
‡  PIPING FROM THE TOP OF THE WATER HEATER WITH TEES IS ACCEPTABLE.WATER HEATER ACCEPTED 
BY THE BOARD FOR 
INSTALLATION IN 
MASSACHUSETTS.
†
TYPICAL MIXING VALVE INSTALLATION 
COMBINATION SPACE HEATING / POTABLE WATER HEATING SYSTEM
SEE
NOTE ‡
INSTALLATION GRAPHIC: GAS-FIRED POTABLE
WATER HEATING/SPACE HEATING SYSTEM
100’-0” MAXIMUM DISTANCE 
FROM WATER HEATER TO FAN 
COIL AND BACK.  (DEVELOPED 
LENGTH) NOT INCLUDING COIL 
IN HEATING UNIT 
† 
						

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TYPICAL INSTALLATION
 GET TO KNOW YOUR WATER HEATER - GAS MODELS (LIST REFERENCING FIGURES 1-5)
1  Vent Termination Hood
2  Wall Plate
3  ***Vent Pipe
4  Cold Water Inlet Nipple/Diptube
5  **Combo Heating System Supply 
Outlet (Optional)
6  T&P Valve
7  Gas Control Valve/Thermostat 
(Honeywell)
8  **Combo Heating System Return 
Inlet (Optional)
9  *Discharge Pipe
10  Drain Valve
11   Outer Gas Door
12  Manifold Door Assembly (behind 
outer door) (see Figure 3 & 
Figure 4)
13  *Floor Drain
14  *Metal Drain Pan
15  Flexible Manifold Tube (see 
Figure 3 & Figure 4)16  *Sediment Trap
17  *Ground Joint Union (gas 
connection)
18  *Main Manual Gas Shut-off Valve
19  *Gas Supply
20  Baffl e Assembly
21  Rating Plate
22  Anode (under cap)
23  Hot Water Outlet Nipple (or 
Optional Nipple/Anode)
24  *Inlet Water Shut-off Valve
25  *Union (water connection)
26  Air Inlet Snorkel
27  Air Tower
28  ***Airbox
29  *Thermal Expansion Tank (required 
for all closed systems)
30  Sheet Metal Burner (see Figure 3 & 
Figure 4)
31  Gas Orifi ce (see Figure 3 & 
Figure 4)32  Gas Manifold (see Figure 3 & 
Figure 4)
33  Manifold Door Gasket (see Figure 3 
& Figure 4)
34  Manifold Door (see Figure 3 & 
Figure 4)
35  Two Piece Grommet With Clip (see 
Figure 3 & Figure 4)
36  Viewport (see Figure 3 & Figure 4)
37  Flexible Manifold Tube (see 
Figure 3 & Figure 4)
38  Pilot (see Figure 3 & Figure 4)
39  Thermopile (see Figure 3 & 
Figure 4)
40  Pilot Shield (see Figure 3 & 
Figure 4)
*, **, *** see notes on following page
Front View
23
132
6
20
4
9
10
13
14
15
16
17
18
19
2
21
1112
4
7
22
8
5
 Figure 1 Rear View
24
29
25
25
26
1
27
28
Figure 2    
						

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Natural gas and Propane (LP) 
main burner with igniter assembly 
for 38k to 42k Btu/hr models
31
36
38
39
30
33
34
35
32
37
40
Figure 3 
37
Natural gas and Propane 
(LP) main burner with igniter 
assembly for 47k Btu/hr 
models
353634
33
32
31
4039
3830
Figure 4 
Vacuum relief valve 
install per local 
codes (not supplied 
with heater).
Figure 5 
Notes:
*  Items not supplied with the water heater.
**  The side recirculation loop connections may not be 
used as the primary water inlet and outlet connections. 
See “Combo Heating Inlet And Outlet Side Taps” 
below.
***  During operation the vent pipe and airbox can get hot.
 REPLACEMENT PARTS AND DELIMING PRODUCTS
Replacement parts and recommended delimer may be 
ordered through authorized servicers or distributors. When 
ordering parts, provide complete model and serial numbers 
(see rating plate), quantity and name of part desired. 
Standard hardware items may be purchased locally.
 COMBO HEATING INLET AND OUTLET SIDE TAPS
Models equipped with Combo Heating capabilities are 
shipped with the two side plumbing taps OPEN (items 5 
and 8 in Figure 1 and see also Figure 8). If the heater is to 
be operated without using the side taps, these openings 
must be closed with the two pipe plugs supplied with 
the heaters.
 HIGH LIMIT CONTROLS (ENERGY CUT OFF)
 Thermostat/Water  Temperature
This feature is a part of the gas control valve/thermostat 
(see Figure 1, item 7) and limits the maximum water 
temperature. In the event of the water overheating, this 
safety feature shuts off the fuel supply to the burner.