A.O. Smith GPDL 40, GPDT 50, GPDX 50L, GPDX 75L Installation Manual

Installation and Operating Manual

RESIDENTIAL GAS WATER HEATERS

POWER DIRECT VENT GAS MODELS

WITH HOT SURFACE IGNITION

NOT FOR USE IN MANUFACTURED (MOBILE) HOMES

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.

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.

• 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.

KEEP THIS MANUAL IN THE POCKET ON HEATER FOR FUTURE REFERENCE

WHENEVER MAINTENANCE ADJUSTMENT OR SERVICE IS REQUIRED.

1602 326961-003

TABLE OF CONTENTS

Safe Installation, Use And Service . . . . . . . . . . . . . . . . . 3

General Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Qualified 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

Water Piping - Mixing Valve Usage . . . . . . . . . . . . . . 11

Mixing Valves

Water Heater Operation . . . . . . . . . . . . . . . . . . . . . . 12

Electrical Requirements & Wiring Diagram . . . . . . . . 13

Safety Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

High Limit Controls (Energy Cut Off). . . . . . . . . . . . . 14

Thermostat/Water Temperature Blower High Limit Switch

Blower Air Pressure Switches . . . . . . . . . . . . . . . . . . 14

Locating The New Water Heater . . . . . . . . . . . . . . . . . 14

Facts To Consider About The Location . . . . . . . . . . . 14

Clearances To Combustibles Floors With Carpeting Clearances For Servicing

High Ambient Temperature Installations . . . . . . . . . . 15

Important Notes and Warnings

Insulation Blankets . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Installing The New Water Heater . . . . . . . . . . . . . . . . . 17

Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Space Heating And Potable Water Systems . . . . . . . 17

Combo Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

System Requirements Installation

Closed Water Systems . . . . . . . . . . . . . . . . . . . . . . . 19

Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Temperature-Pressure Relief Valve. . . . . . . . . . . . . . 20

T&P Valve Discharge Pipe Requirements: Temperature-Pressure Relief Valve And Pipe

Insulation

High Altitude Installation . . . . . . . . . . . . . . . . . . . . . . 21

Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Sediment Traps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Filling The Water Heater . . . . . . . . . . . . . . . . . . . . . . 23

Termination Clearances (Side Wall) . . . . . . . . . . . . . 24

Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Side Wall Vent Terminal Installation Side Wall Vent For Cold Climates Tee Termination Installation Roof Vent Terminal Installation Concentric Vent Termination Installation Multiple Concentric Vent Installation Vent Pipe Material Polypropylene Vent Systems Vent Pipe Length And Sizing

Vent Screens Vent Pipe Installation Vent Pipe Runs Vent Terminal Installations

Vent Pipe Preparation . . . . . . . . . . . . . . . . . . . . . . . . 33

Blower Assembly Installation. . . . . . . . . . . . . . . . . . . 35

Connections To The Blower And Air Duct

Condensate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Sound Suppressor (Optional) . . . . . . . . . . . . . . . . . . 38

Sound Suppressor At Blower

Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . 39

Lighting Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Operating The Temperature Control System . . . . . . . . 41

Gas Control Valve/Thermostat . . . . . . . . . . . . . . . . . 42

For Your Information . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Start Up Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Condensation Smoke/Odor Strange Sounds

Operational Conditions . . . . . . . . . . . . . . . . . . . . . . . 43

Smelly Water

“Air” In Hot-Water Faucets . . . . . . . . . . . . . . . . . . . . 43

Periodic Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . 44

General Upkeep . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Venting System Inspection . . . . . . . . . . . . . . . . . . . . 44

Burner Operation And Inspection . . . . . . . . . . . . . . . 44

Combustion Chamber And Burner Cleaning. . . . . . . 45

Housekeeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Temperature-Pressure Relief Valve Test . . . . . . . . . . 45

Draining And Flushing. . . . . . . . . . . . . . . . . . . . . . . . 46

To Drain The Water Heater Storage Tank To Flush The Water Heater Storage Tank

Anode Rod Maintenance. . . . . . . . . . . . . . . . . . . . . . 47

Leakage Checkpoints. . . . . . . . . . . . . . . . . . . . . . . . . . 48

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Reference Parts Listing . . . . . . . . . . . . . . . . . . . . . . . . 49

Troubleshooting Guidelines . . . . . . . . . . . . . . . . . . . . . 51

Lockouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Soft Lockout Hard Lockout

Resetting The Heater Control . . . . . . . . . . . . . . . . . . 51

Ignition State And Timing . . . . . . . . . . . . . . . . . . . . . 51

System Status And Error Codes . . . . . . . . . . . . . . . . 52

Reading The LED Flash Sequence. . . . . . . . . . . . . . 52

Corrective Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Other Symptoms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

2 www. hotwater .com 326961-003

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.

DANGER indicates an imminently

DANGER

WARNING

CAUTION

hazardous situation which, if not avoided, will result in death or injury.

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury.

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, could result in property damage

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.

This product is certified to comply with a maximum weighted average of 0.25% lead content as required in some areas.

IMPORTANT DEFINITIONS

Qualified Installer: A qualified installer must have ability equivalent to a licensed tradesman in the fields 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 fired water heaters. The qualified installer must also be familiar with the design features and use of flammable 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 fields 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 fired 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.

326961-003 www. hotwater .com 3

GENERAL SAFETY

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

WARNING

Water temperature over 125°F can cause severe burns instantly resulting in severe injury or death.

Children, the elderly and the disabled and are at highest risk of scald injury.

Feel water before bathing or showering.

WARNING

Fire Hazard

For continued protection against risk of fire:

• Do not install water heater on carpeted floor.

• Do not operate water heater if flood damaged.

WARNING

Explosion Hazard

•

Overheated water can cause

water tank explosion.

•

Properly sized temperature and

pressure relief valve must be installed in opening provided.

HOT

BURN

Temperature limiting valves are available.

Read instruction manual for safe temperature setting.

WARNING

Fire or Explosion Hazard

• 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 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.

Read instruction manual before

installing, using or servicing

water heater.

4 www. hotwater .com 326961-003

GENERAL SAFETY

CAUTION

Improper Installation, use and service may result

in property damage.

• Do not operate water heater if flood damaged.

• Inspect anode rods regularly, replace when significantly

depleted.

• Install in location with drainage.

• Fill tank with water before operation.

• Properly sized thermal expansion tanks are required on all

closed water systems.

Refer to this manual for installation and service.

WARNING

Breathing Hazard - Carbon Monoxide Gas

• Install vent system in accordance with codes.

• Do not operate water heater if flood damaged.

• For operation above 10,100’, a high altitude orifice must be installed.

• Do not operate if soot buildup is present.

• Do not obstruct water heater air intake with insulating jacket.

• Do not obstruct blower air intake.

• Do not place chemical vapor emitting products near water heater.

• Gas and carbon monoxide detectors are available.

• No vent damper installation is compatible with this power vented water heater.

Breathing carbon monoxide can cause brain damage or death.

Always read and understand instruction manual.

• Before servicing the water heater, make sure the blower assembly is unplugged or the electrical supply to the water heater is tumed "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.

WARNING

FLAMMBLE

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 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.

WARNING

Flammable Vapors

Water heater has a main burner and hot surface igniter. The hot surface igniter:

1. can be triggered at any time and

2. the hot surface 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 the electodes by air currents.

Installation: Do not install the water heater where flammable products will be stored or used.

326961-003 www. hotwater .com 5

INTRODUCTION

Thank You for purchasing this water heater. Properly

installed and maintained, it should give you years of trouble free service.

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-fired water heater is design certified by CSA International as a Category IV water heater, under Water

Heater Standard ANSI Z21.10.1 • CSA 4.1 or ANSI Z21.10.3 • CSA 4.3 (current edition), as applicable.

QUALIFIED INSTALLER OR SERVICE AGENCY

Installation and service of this water heater requires ability equivalent to that of a Qualified Agency (as defined by ANSI below) in the field 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: “Qualified Agency” - “Any individual, firm, 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 qualified (as defined 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 first 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-fired 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 first few pages, READ ENTIRE MANUAL BEFORE ATTEMPTING TO INSTALL OR OPERATE THE WATER HEATER. 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.

2. The water heater, when installed, must be electrically grounded in accordance with the local codes or in the absence of local codes: current edition of the “National Electrical Code”, NFPA 70.

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 fires (see Figure 13). Examine the location to ensure the water heater complies with the “Locating The New Water Heater” section in this manual.

5. For installation in areas subject to earthquakes, this water heater must be braced, anchored, or strapped to avoid falling or moving during an earthquake. See instructions for correct installation procedures. Instructions may be obtained from:

California Office of the State Architect, 400 P Street, Sacramento, CA 95814.

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. Complies with California Health and Safety code 116875 (known as AB-1953) and with weighted average maximum of 0.25% lead.

6 www. hotwater .com 326961-003

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 finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:

INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber or gasfitter 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 qualified 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 floor 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 certified.

SIGNAGE A metal or plastic identification 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 flue gases, but identifies “special venting systems,” the following requirements shall be satisfied 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.

326961-003 www. hotwater .com 7

INSTALLATION GRAPHIC: GAS-FIRED POTABLE WATER HEATING/SPACE HEATING SYSTEM

• 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.

COMBINATION SPACE HEATING / POTABLE WATER HEATING SYSTEM

TEMPERED WATER TO FIXTURES (MUST MEET TEMPS LISTED IN MASS. CODE 248 CMR

MUST BE VERTICAL TO REMOVE A

MIXING VALVE (MUST BE INSTALLED BELOW TOP OF WATER HEATER AS PER MANUFACTURER’S RECOMMENDATIONS)

WATER HEATER ACCEPTED BY THE BOARD FOR INSTALLATION IN MASSACHUSETTS.

MASSACHUSETTS INSTALLATION REQUIREMENTS:

1.) CONNECT ELECTRONICALLY-CONTROLLED TIMER TO AN ALL-BRONZE PUMP. PUMP MUST ACTIVATE EVERY 6 HOURS

2.) ALL WATER PIPING MUST BE INSTALLED AND INSULATED IN ACCORDANCE WITH MASSACHUSETTS CODE (248 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.

IR BUBBLES

FOR 60 SECONDS. TURN PUMP TIMER OFF BEFORE CLOSING PIPING LOOP SHUT-OFF VALVE.

& 780 CMR).

†

)

†

TYPICAL MIXING VALVE INSTALLATION

EXPANSION TANK

CHECK

VALVE

UNION

HOT

WATER

OUT

VACUUM

†

RELIEF VALVE

UNION

TEMP/ PRESSURE RELIEF VALV E

SEE NOTE ‡

100’-0” MAXIMUM DISTANCE FROM WATER HEATER TO FAN COIL AND BACK. (DEVELOPED LENGTH) NOT INCLUDING COIL

CHECK VALVE

(1/8” HOLE

DRILLED IN CLAPPER)

PUMP

AIR

HANDLER

SHUT-OFF

VALV E

IN HEATING UNIT

COLD WATER INLET

†

FLOW CONTROL

OUT

COIL

AIR

HANDLER

†

SHUT-OFF

VALVE

8 www. hotwater .com 326961-003

TYPICAL INSTALLATION

GET TO KNOW YOUR WATER HEATER - GAS MODELS (LIST REFERENCING FIGURES 1-5)

1 Termination Elbow with Vent Screen 2 *Vent Pipe 3 *Vent Pipe Elbow (long radius) 4 Sound Suppressor (Optional) 5 *Union (Di-electric water

connection) 6 Cold-Water Inlet Nipple/Diptube 7 **Combo Heating System Supply

Outlet (Optional) 8 T&P Valve 9 * Discharge Pipe 10 **Combo Heating System Return

Inlet (Optional) 11 Gas Control Valve/Thermostat

(Honeywell) 12 Gas Valve Electronic Control

Module And Cover (Honeywell) 13 Drain Valve 14 Outer Gas Door 15 Manifold Door Assembly (behind

outer door) (see Figure 3 &

Figure 4) 16 *Metal Drain Pan 17 *Floor Drain

18 Flexible Manifold Tube (see

Figure 3 & Figure 4) 19 ***Control Harness 20 *Sediment Trap 21 *Ground Joint Union (gas

connection) 22 *Main Manual Gas Shut-off Valve 23 *Gas Supply* 24 Anode (under cap) 25 Baffle Assembly 26 Hot-Water Outlet Nipple/Anode 27 *Inlet Water Shut-off Valve 28 ****Rubber Coupling (see Figure 5) 29 Gear Clamp (see Figure 5) 30 ***Blower with Power Cord (see

Figure 5) 31 Air Duct Adapter 32 Air Inlet Snorkel 33 Air Duct 34 *Thermal Expansion Tank (see

“Closed Water Systems” and

“Thermal Expansion” sections) 35 Flame Sensor Rod (see Figure 3 &

Figure 4) 36 Sheet Metal Burner (see Figure 3 &

Figure 4)

37 Gas Orifice (see Figure 3 &

Figure 4)

38 Gas Manifold (see Figure 3 &

Figure 4)

39 Hot-Surface Igniter (see Figure 3 &

Figure 4)

40 Manifold Door Gasket (see Figure 3

& Figure 4)

41 Manifold Door (see Figure 3 &

Figure 4)

42 Two Piece Grommet With Clip (see

Figure 3 & Figure 4) 43 Viewport (see Figure 3 & Figure 4) 44 Air Tubing (Intake) (see Figure 5) 45 Blower High Limit Switch (see

Figure 5) 46 Intake Air Pressure Switch (NC)

(inside box) (see Figure 5) 47 Capacitor (see Figure 5) 48 Air Tubing (Exhaust) (see Figure 5) 49 Exhaust Air Pressure Switch (NO)

(inside box) (see Figure 5)

*, **, ***, **** see notes on following page

AIR INLET

PIPING

EXHAUST OUTLET

PIPING

11 12

14 15

Front View

Figure 1. Figure 2.

326961-003 www. hotwater .com 9

1718

Rear View

Natural gas and Propane main burner with igniter assembly for 40k and 45k Btu/hr models (item 15 in Figure 1) †.

Vacuum relief valve install per local codes (not supplied with heater).

Figure 3.

Natural gas and Propane (LP) main burner with igniter assembly for 58k, 62k, 72k and 76k Btu/ hr models (item 15 in Figure 1) †.

Figure 6.

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. *** Caution harness has 120 VAC In operation. **** See “Vent Pipe Installation” for more information.

† Propane (LP) models have Left-hand threads.

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.

Shown with Junction Box Cover removed for clarity.

Figure 4.

COMBO HEATING INLET AND OUTLET SIDE TAPS

Models equipped with Combo Heating capabilities have the two side plumbing taps plugged (item 7 and item 10 in Figure 1 and see also Figure 7 & Figure 8). If the heater is to be installed in a Combo Heating application, these plugs must be removed.

Figure 5.

10 www. hotwater .com 326961-003

WATER PIPING - MIXING VALVE USAGE

Mixing Valves

Water temperature over

DANGER

125°F can cause severe burns instantly resulting in severe injury or death.

Children, the elderly and the disabled and are at highest risk of scald injury.

This appliance has been design certified as complying with ANSI/CSA Standard for water heaters and are considered suitable for combination Water (Potable) Heating and Space Heating but not space heating only applications. The water supply pressure should not exceed 80 psi. If this occurs, a pressure reducing valve with a bypass should be installed in the cold water inlet line. This should be placed on the supply to the entire house in order to maintain equal hot and cold water pressures.

Feel water before bathing or showering.

Temperature limiting devices

HOT

such as mixing must be installed when required by codes and to ensure safe

BURN

temperatures at fixtures.

Water heated to a temperature which satisfies space heating, clothes washing, dish washing, and other sanitizing needs can scald and cause permanent injury upon contact. Short repeated heating cycles caused by small hot-water uses can cause a temperature increase of the hot water by 20F° higher than the heater’s temperature settings.

TEMPERED POTABLE WATER

MIXING

VALVE *

TEMPERATUREPRESSURE RELIEF VALVE

DISCHARGE PIPE (DO NOT CAP OR PLUG)

SUGGESTED PIPING ARRANGEMENT

FOR SIDE CONNECTIONS

SHUT-OFF

VALV E

COLD-WATER

INLET

CERTAIN MODELS

ARE EQUIPPED WITH

SIDE PLUMBING

CONNECTIONS FOR

SPACE HEATING.

THE HOT AND COLD FITTING

ASSEMBLIES (PART

#9001262005) CAN

BE ORDERED

THROUGH THE

MANUFACTURER

TEMPERED

POTABLE WATER

NON-TEMPERED

WATER SUPPLY

SUGGESTED PIPING

ARRANGEMENT FOR

TOP CONNECTIONS

TEMPERATUREPRESSURE RELIEF VALVE

DISCHARGE PIPE (DO NOT CAP OR PLUG)

DRAIN VALV E

* (MUST BE INSTALLED BELOW TOP OF WATER HEATER AS PER MANUFACTURER’S RECOMMENDATIONS)

MASSACHUSETTS: INSTALL A VACUUM RELIEF IN COLD WATER LINE PER SECTION 19 MGL 142.

SHUT-OFF

VALV E

COLD-WATER

NON-TEMPERED

WATER RETURN

MIXING VALVE *

METAL DRAIN

PAN 1.75”

MAX. DEPTH.

AT LEAST 2”

GREATER THAN

THE DIAMETER OF THE WATER

HEATER.

6” MAX. AIR GAP*

Figure 8.

INLET

METAL DRAIN

PAN 1.75” MAX.

DEPTH. AT LEAST 2”

GREATER THAN THE

DIAMETER OF THE

WATER HEATER.

DRAIN VALV E

* (MUST BE INSTALLED BELOW TOP OF WATER HEATER AS PER MANUFACTURER’S RECOMMENDATIONS)

MASSACHUSETTS: INSTALL A VACUUM RELIEF IN COLD WATER LINE PER SECTION 19 MGL 142.

6” MAX. AIR GAP*

Figure 7.

TEMPERED

POTABLE WATER

NON-

TEMPERED

WATER

SUPPLY

TO HOT OUTLET

* (MUST BE INSTALLED BELOW TOP OF WATER HEATER AS PER MANUFACTURER’S RECOMMENDATIONS)

MIXING

VALV E *

Figure 9.

SHUT-OFF

VALV E

COLD-WATER

SUPPLY

NON-TEMPERED WATER RETURN

TO COLD

INLET

326961-003 www. hotwater .com 11

Some people are more likely to be permanently injured by hot water than others. These include the elderly, children, the infirm and the physically/mentally disabled. Table 1 (published by U.S. Government Memorandum,

1978) shows the approximate time-to-burn relationship for normal adult skin. If anyone using hot water provided by the water heater being installed fits into one of these groups, special precautions must be taken.

WATER HEATER OPERATION

Figure 10 shows the water heater’s sequence of operation when a call for heat is initiated. The ignition control module will attempt to light the burner three times. If the ignition control does not detect ignition it will enter lockout mode and flash the corresponding error code.

Water

Temperature

°F

Time for 1st

Degree Burns

(Less Severe Burns)

Time for Permanent

Burns 2nd & 3rd

Degree (Most

Severe Burns)

110 (normal shower temp.)

116 (pain threshold)

116 35 minutes 45 minutes

122 1 minute 5 minutes

131 5 seconds 25 seconds

140 2 seconds 5 seconds

149 1 second 2 seconds

154 instantaneous 1 seconds

(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15,1978)

Table 1.

In addition to using lowest possible temperature setting that satisfies demand of application, a mixing valve should be installed at water heater (see Figure 7 & Figure 8) or at hot-water taps to further reduce system water temperature. Mixing valves are available at plumbing supply stores. Consult a Qualified Installer or Service Agency. Follow mixing valve manufacturer’s instructions for installation of the valves. Before changing the factory setting on the thermostat, read the “Operating The Temperature Control System” section in this manual.

HEATER

THERMOSTAT

CALLS FOR

HEAT

HEATER CONTROL

CHECKS TO ENSURE

BLOWER EXHAUST

PRESSURE SWITCH

IS OPEN

BLOWER IS

ENERGIZED

CONTROL CHECKS

TO ENSURE: EXHAUST PRESSURE SWITCH CLOSES AND

INTAKE PRESSURE

SWITCH REMAINS

CLOSED INDICATING

BLOWER IS

OPERATING AND

THERE ARE NO

BLOCKAGES (INTAKE

OR EXHAUST)

TEMPERATURE

SWITCH REMAINS

CLOSED INDICATING

VENT TEMPERATURE

IS NOT ABOVE THE

ALLOWABLE LIMIT

IGNITER IS

ENERGIZED AND GAS

VALVE IS OPENED

BURNER COMES ON

AND THE FLAME IS

SENSED BY CONTROL

BURNER CONTINUES

TILL THE WATER IN

THE TANK REACHES

THERMOSTAT

SETTING

GAS VALVE IS

CLOSED AND

BURNER SHUTS OFF

BLOWER CONTINUES

FOR A POST PURGE

TIME

HEATER

REMAINS ON STANDBY UNTIL NEXT CALL FOR

HEAT

Figure 10.

12 www. hotwater .com 326961-003

ELECTRICAL REQUIREMENTS & WIRING DIAGRAM

WARNING

Electric Shock Hazard

Disconnect power before servicing.

Replace all parts and panels before operating.

Failure to do so can result in death or electrical shock.

Before plugging in the water heater, always make sure:

• The voltage and frequency correspond to that

specified on the water heater wiring diagram.

• The electrical outlet has the proper overload fuse or

breaker protection.

1. The unit must be connected to a 120VAC power supply. A dedicated circuit is preferred. Do not use a GFI outlet.

2. The water heater must be properly grounded.

3. This water heater is a polarity sensitive appliance and will not operate if the power supply polarity is reversed.

Note: Always reference the wiring diagram for the correct electrical connections.

CAUTION:

LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION. VERIFY PROPER OPERATION AFTER SERVICING. POWER VENT WIRING SCHEMATIC.

NOTE: REFER TO THE “INSTALLATION CHECKLIST” BEFORE OPERATING THIS HEATER.

EARTH GND

CAPACITOR

BLOWER

FLAME SENSOR

HOT SURFACE IGNITER

PRESSURE SWITCH (CLOSED)

PRESSURE SWITCH (OPEN)

PRESSURE SWITCH (CLOSED)

HIGH LIMIT SWITCH (CLOSED)

After making all electrical connections, completely fill the tank with water and check all connections for leaks. Open the nearest hot-water faucet and let it run for 3 minutes to purge the water lines of air and sediment and to ensure complete filling of the tank. The electrical power may then be turned on. Verify proper operation after servicing. See also “Installation Checklist”.

IF WIRING HAS TO BE REPLACED IN THE FIELD, USE ONLY TYPE TEW 105°C WIRE.

YELLOW

WHITE

BLUE

BLACK

GREEN

IGNITER - FLAME ROD ASSEMBLY

ELECTRICAL RATING 120V, 5A, 60 HZ.

PRESSURE

SWITCH

YELLOW

BLUE

JP 1

(NO)

BLACK SMOOTH - LINE

BLACK RIBBED - NEUTRAL

BLACK MIDDLE - GND

Circled numbers indicate sequence of operation.

Figure 12.

PRESSURE

SWITCH

(NC)

CAPACITOR

BLACK

BLACK WHITE

GREEN

120Vac/60Hz Wall Plug

HIGH LIMIT

BLOWER

SWITCH

HONEYWELL GAS VALVE

JUNCTION BOX

Figure 11.

326961-003 www. hotwater .com 13

SAFETY LOCKOUTS

This water heater has several lockout features designed to prevent the heater from operating in unsafe conditions.

HIGH LIMIT CONTROLS (ENERGY CUT OFF)

Thermostat/Water Temperature

This feature is a part of the gas control valve/thermostat (see Figure 1, item 10) and limits the maximum water temperature. In the event of the water overheating, this safety feature shuts off the fuel supply to the burner.

Blower High Limit Switch

This device is located on the blower (see Figure 5, item

45) and limits the maximum temperature of the blower. If the blower temperature rises above the temperature setting, the switch opens causing the heater to shut down.

LOCATING THE NEW WATER HEATER

FACTS TO CONSIDER ABOUT THE LOCATION

Carefully choose an indoor location for the new water heater because the placement is a very important consideration for the safety of the occupants in the building and for the most economical use of the appliance. This water heater is not for use in manufactured (mobile) homes or outdoor installation. Whether replacing an old water heater or putting the water heater in a new location, the following critical points must be observed:

1. Select a location indoors as close as practical to

the vent termination or location to which the water heater vent piping is going to be connected, and as centralized with the water piping system as possible.

2. Selected location must provide adequate clearances

for servicing and proper operation of the water heater.

3. Avoid locations that could cause the water heater to

freeze from outside air.

4. Selected location must provide access to a properly

grounded electrical branch circuit. A dedicated circuit is preferred. Do not use a GFI outlet.

5. Avoid locations that expose the water heater to direct

sunlight.

6. Keep combustibles such as boxes, magazines,

clothes, etc., away from the water heater area. Important: Do not use an extension cord to connect the water heater to an electrical outlet.

CAUTION

Property Damage Hazard

• All water heaters eventually leak.

The switch will auto reset once the temperature drops sufficiently.

BLOWER AIR PRESSURE SWITCHES

The blower/heater is equipped with two air pressure switches located in the junction box (see Figure 5, item 46 and item 49). These devices are connected in series and monitor the air pressure produced by the blower. In the event that the exhaust venting becomes blocked or sufficiently restricted, the normally open (NO) air pressure switch will shut down the heater. In the event that the intake pipe becomes sufficiently blocked or restricted, the normally closed (NC) air pressure switch will shut down the heater.

leak, the flow of water will not cause damage to the structure. For this reason it is not advisable to install the water heater in an attic or upper floor. In all cases, a metal drain pan should be installed under the water heater. Metal drain pans are available at your local hardware store. Such a metal drain pan must have a clearance of at least 1” greater than any point on the water heater’s outer jacket and must be piped to an adequate drain. The pan must have a maximum depth of 1.75” . Water heater life depends upon water quality, water pressure and the environment in which the water heater is installed. Water heaters are sometimes installed in locations where leakage may result in property damage, even with the use of a metal drain pan piped to a drain. However, unanticipated damage can be reduced or prevented by a leak detector or water shut-off device used in conjunction with a piped metal drain pan. These devices are available from some plumbing supply wholesalers and retailers, and detect and react to leakage in various ways:

• Sensors mounted in the metal drain pan that trigger an

alarm or turn off the incoming water to the water heater when leakage is detected.

• Sensors mounted in the metal drain pan that turn off

the water supply to the entire building when water is detected in the metal drain pan.

• Water supply shut-off devices that activate based on

the water pressure differential between the cold-water and hot-water pipes connected to the water heater.

• Devices that will turn off the gas supply to a gas water

heater while at the same time shutting off its water supply.

• Do not install without adequate drainage.

Installation of the water heater must be accomplished in such a manner that if the tank or any connections should

14 www. hotwater .com 326961-003

WARNING

Fire or Explosion Hazard

• 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 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.

Read instruction manual before

installing, using or servicing

water heater.

Clearances For Servicing

When installing the heater, consideration must be given to proper location. Location selected should be as close to the wall as practicable and as centralized with the water piping system as possible.

Servicing this appliance, such as changing the anodes, etc. requires clearances for accessibility and replacement of parts. The anode could be as long as 35” .

Refer to the current edition of the “National Fuel Gas

Code”, ANSI Z223.1/NFPA 54 for detailed requirements.

TOP VIEW

OF CLOSET

WITHOUT DOOR

0” MIN. 0” MIN.

TOP VIEW OF

CLOSET WITH

DOOR

WARNING

FLAMMABLES

FIRE AND EXPLOSION HAZARD

Can result in serious injury or death

Do not store or use gasoline or other flammable vapors and

liquids in the vicinity of this or any other appliance. Storage or

use of gasoline or other flammable vapors or liquids in the

vicinity of this or any other appliance can result in serious injury

or death.

Flammable Vapors

WARNING

Fire Hazard

For continued protection against risk of fire:

• Do not install water heater on carpeted floor.

• Do not operate water heater if flood damaged.

Clearances To Combustibles

Minimum clearances between water heater and combustibles are 0” at the sides and rear, 5.5” from the front and 12” from top (standard clearance.) If clearances stated on the heater differ from standard clearances, install water heater according to clearances stated on the heater (see Figure 13).

Floors With Carpeting

This water heater must not be installed directly on carpeting. Carpeting must be protected by a metal or wood panel beneath the appliance extending beyond the full width and depth of the appliance by at least 3” in every direction, or if the appliance is installed in an alcove or closet, the entire floor must be covered by the panel. Failure to heed this warning may result in a fire hazard.

0” MIN.

5.5” MIN.

Figure 13.

WARNING

Breathing Hazard - Carbon Monoxide Gas

• Install water heater in accordance with the instruction manual and NFPA 54.

• To avoid injury, combustion and ventilation air must be taken from outdoors.

• Do not place chemical vapor emitting products near water heater.

Breathing carbon monoxide can cause brain damage or death.

Always read and understand instruction manual.

HIGH AMBIENT TEMPERATURE INSTALLATIONS

As the room temperature rises, the water heater venting is exposed to high temperatures from the inside and the outside. In these situations, attention to the choice of venting material is necessary. Establishing the ambient temperatures where the heater and the venting are installed is very important. Areas that can experience high ambient environments include closets, alcoves, areas under staircases, attics (especially in metal roofed buildings), areas with restricted air movement, rooms with large solar gains, metal sheds, industrial or commercial enterprises and venting systems exposed to direct sunlight. Water heater installations in ambient conditions hotter than 110°F require the installation of a high ambient limit switch (kit number 9009024015) and use of CPVC or polypropylene venting material. Failure to install the proper vent material will result in a non-compliant installation and can result in deformation/breakage of the pipe.

326961-003 www. hotwater .com 15

WARNING

Breathing Hazard - Carbon Monoxide Gas

• Flue gases may escape if vent pipe is deformed, broken, or not properly connected.

Breathing carbon monoxide can cause brain damage or death.

Always read and understand instruction manual.

Important Notes and Warnings

• This heater is certified to be installed using Schedule

40 PVC or CPVC or polypropylene plastic vent material. Only use approved material. All venting material and components must be joined with the approved primer/ cleaner and solvent cement.

• Do not common vent this heater with any other

appliance.

• During operation the plastic piping will expand as it

heats up and contract as it cools down. This is normal for this type of venting. Rigidly fastening the vent piping can cause undue stress that may result in the cracking or fracturing the vent piping material. A fracture of the venting pipe may pose a serious safety hazard. To prevent stressing of the vent system, all hangers and supports must allow the vent piping freedom to move.

• Use long sweep elbows wherever possible. Closely

coupled elbows and short radius elbows can reduce the venting capacity.

• All power vented water heaters generate a certain

amount of operational noise. In order to minimize noise transmission to the support structure, it is recommended to use isolation pads between the pipe hangers and the vent pipe.

• Most power vent installations develop some

condensation in the vent piping. When using long runs of venting or when the venting passes through cold or unheated areas, considerable amounts of condensate from the flue gases can develop. Provision must be made for the condensate to drain freely from the system or to be collected in a condensate trap(s) that can be drained. Damage or fracture of the vent piping may occur if the condensate is allowed to collect and freeze. Pooling of condensate can restrict airflow and can cause nuisance failures of the system.

INSULATION BLANKETS

Insulation blankets are available to the general public for external use on gas water heaters but are not necessary with these products. The purpose of an insulation blanket is to reduce standby heat loss encountered with storage tank heaters. Your water heater meets or exceeds the current standards with respect to insulation and standby loss requirements, making an insulation blanket unnecessary. Should you choose to apply an insulation blanket to this heater, you should follow these instructions (For identification of components mentioned below, see Figure 1 thru Figure 6). Failure to follow these instructions will restrict the air flow required for proper combustion and dilution, potentially resulting in fire, asphyxiation, serious personal injury or death.

• Do not apply insulation to the top of the water heater,

as this will interfere with safe operation of the blower assembly.

• Do not cover the outer door, thermostat or T&P relief

valve.

• Do not cover the “Installation And Operating manual”.

Keep it on the side of the water heater or nearby for future reference.

• Do obtain new warning and instruction labels from the

manufacturer for placement on the blanket directly over the existing labels.

• Do inspect the insulation blanket frequently to make

certain it does not sag, thereby obstructing combustion air flow.

WARNING

Breathing Hazard - Carbon Monoxide Gas

• Do not obstruct water heater air intake(s) with insulating jacket.

• Gas and carbcn monoxide detectors are available.

• Install water heater in accordance with the instruction manual and NFPA54.

Breathing carbon monoxide can cause brain damage or death.

Always read and understand instruction manual.

AIR REQUIREMENTS

For safe operation an adequate supply of fresh, uncontaminated air for combustion, dilution and ventilation must be provided. Note: Contaminated or dusty air may cause build-up on the blower wheel resulting in nuisance shut downs.

16 www. hotwater .com 326961-003

INSTALLING THE NEW WATER HEATER

WATER PIPING

Water temperature over

DANGER

HOT

BURN

The water supply pressure should not exceed 80 psi. If this occurs, a pressure reducing valve with a bypass should be installed in the cold water inlet line. This should be placed on the supply to the entire house in order to maintain equal hot and cold water pressures.

HOT WATER CAN SCALD: Water heaters are intended to produce hot water. Water heated to a temperature which will satisfy space heating, clothes washing, dish washing, cleaning and other sanitizing needs can scald and permanently injure you upon contact. Some people are more likely to be permanently injured by hot water than others. These include the elderly, children, the infirm, or physically/ mentally handicapped. If anyone using hot water fits into one of these groups or if there is a local code or state law requiring certain temperature water at the hot-water tap, then you must take special precautions. In addition to using lowest possible temperature setting that satisfies your hot water needs, a means such as a mixing valve, should be used at hot-water taps used by these people or at the water heater (see Figure 7 & Figure 8). Valves for reducing point of use temperature by mixing cold and hot water are also available.

SPACE HEATING AND POTABLE WATER SYSTEMS

This appliance has been design certified as complying with American National Standard/CSA Standard for water heaters and is suitable for combination water (potable) heating and space heating but not space heating only applications.

125°F can cause severe burns instantly resulting in severe injury or death.

Children, the elderly and the disabled and are at highest risk of scald injury.

Feel water before bathing or showering.

Temperature limiting devices such as mixing must be installed when required by codes and to ensure safe temperatures at fixtures.

WARNING

Toxic Chemical Hazard

• Do not connect to non-potable water system.

Consult a Qualified Installer or Service Agency. Follow manufacturer’s instructions for installation of valves. Before changing the factory setting on thermostat, read “Operating The Temperature Control System” section in this manual.

• This water heater should not be connected to any

heating systems or components previously used with a non-potable water heating appliance.

• All piping components connected to this unit for space

heating applications should be suitable for use with potable water.

• Toxic chemicals, such as those used for boiler treatment

shall not be introduced into the potable water used for space heating.

• When the system requires water for space heating at

temperatures higher than required for domestic water purposes, a mixing valve must be installed. Please refer to Figure 7 & Figure 8 for suggested piping

arrangement. Note: Water piping and vent piping occupy the space above the water heater. Plan the water piping to ensure it does not cause interference with the vent piping (see “Planning the Vent System”). If this water heater is to be used to supply both space heating and potable water, the instructions listed below must be followed:

• Be sure to follow the manual(s) shipped with the air

handler or other type heating system.

• This water heater is not to be used as a replacement

for an existing boiler installation.

• Do not use with piping that has been treated with

chromates, boiler seal or other chemicals and do not

add any chemicals to the water heater piping.

• If the space heating system requires water temperatures

in excess of 120°F , steps must be taken to limit

temperatures at fixtures in the potable hot-water supply

for safety and regulatory requirements.

• Pumps, valves, piping and fittings must be compatible

with potable water.

• A properly installed flow control valve is required to

prevent thermosiphoning. Thermosiphoning is the

result of a continuous flow of water through the air

handler circuit during the off cycle. Weeping (blow off)

of the temperature-pressure relief valve (T&P) or higher

than normal water temperatures are the first signs of

thermosiphoning.

• The hot-water line from the water heater should be

vertical past any mixing valve or supply line to the

heating system to remove air bubbles from the system.

• Do not connect the water heater to any system or

components previously used with non-potable water

heating appliances when used to supply potable water.

326961-003 www. hotwater .com 17

+ 39 hidden pages