State GS6 75 URRBS User Manual

RESIDENTIAL ULTRA LOW NOx GAS WATER HEATER

• INSTALLATION • OPERATION • SERVICE • MAINTENANCE •

LOW LEAD

CONTENT

CAUTION

TEXT PRINTED OR OUTLINED IN RED CONT AINS INFORMA TION RELATIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY BEFORE INSTALLING AND USING THIS APPLIANCE.

PLACE THESE INSTRUCTIONS ADJACENT TO HEATER

PRINTED IN U.S.A. 1112 PART NO. 325321-000

AND NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.

ROUGH-IN DIMENSIONS

TOP VIEW

*INSTALL IN ACCORDANCE WITH LOCAL CODES

FIGURE 1.

TABLE 1, DIMENSIONS

Units A B C D E F G H J K L M P Q

InchesCM66 5/8

169.22

TABLE 2, RECOVERY RATINGS ARE BASED ON 80% THERMAL EFFICIENCY

58 3/4

149.23

30 15/16

76.99

27 3/4

70.5

15 1/4

38.6410.2

15 3/4

40.01640.6

1 1/4

3.2

1 1/4

NPT

1/2

NPT

12 1/4

31.1

24 7/8

63.2

INPUT RATE Recovery in US Gallons/hr or Liters/hr at Indicated Temperature Rise in Fahrenheit or Celsius

75,100 BTU/H

22 KW

°F 30 36 40 50 54 60 70 72 80 90 100 108 110 120 126 130 140

GPH 243 203 182 145 134 122 104 101 91 81 73 67 66 60 57 56 52

°C 17 20 23 28 30 33 39 40 44 50 56 60 61 67 70 72 78

LPH 920 767 688 549 509 460 392 381 344 306 277 254 251 228 217 213 199

TABLE 3, GAS AND ELECTRICAL CHARACTERISTICS

Manifold Pressure Electrical Characteristics

Type of gas Inches W.C. kPa Voltz/Hz Amperes

Natural Gas 4.0 1.12 120/60 <5

All Models: Maximum supply pressure = 14.0 in. W.C. (3.48 kPa) Minimum supply pressure, Natural gas = 6 in. W.C. (1.49 kPa). Minimum pressures must be maintained under both load and no load (static and dynamic) conditions.

FOREWORD

The design of these models comply with the current edition of ANSI Z21.10.3/CSA 4.3 an automatic storage water heater.

Installation diagrams are found in this manual. These diagrams will serve to provide the installer with a reference for the materials and method of piping necessary. It is highly essential that all water and gas piping be installed as shown on the diagrams.

In addition to these instructions, the equipment shall be installed in accordance with those installation regulations in force in the local area where the installation is to be made. These shall be carefully followed in all cases. Authorities having jurisdiction should be consulted before installations are made.

The installation must conform with these instructions and the local code authority having jurisdiction. In the absence of local codes, installations should comply with the National Fuel Gas Code (ANSI Z223.1/NFPA

54) and the National Electric Code (NFPA 70). These publications are available from The National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02269

Thank You for purchasing this water heater. Properly installed and maintained, it should give you years of trouble free service.

Abbreviations Found In This Manual:

• CSA-Canadian Standards Association

• ANSI-American National Standards Institute

• NFPA-National Fire Protection Association

• AHRI-Air Conditioning, Heating and Refrigeration Institute

• UL-Underwriters Laboratories This gas-fired water heater is design certified by Underwriters

Laboratories Inc. under American National Standard/CSA Standard for Gas Wtare Heaters ANSI Z21.10.3•CSA 4.3 (current edition).

53 7/8

136.8

GENERAL SAFETY

TABLE OF CONTENTS

Page

ROUGH-IN DIMENSIONS ............................................................. 2

FOREWORD ................................................................................. 2

GENERAL SAFETY INFORMATION

Precautions ................................................................................ 4

Preparing for the Installation ...................................................... 4

Grounding Instructions............................................................... 4

Chemical Vapor Corrosion ......................................................... 5

Extended Non-use Periods ........................................................ 5

Insulation Blankets..................................................................... 5

High Altitude Installations........................................................... 5

Circulating Pump ....................................................................... 6

INSTALLATION INSTRUCTIONS

Required Ability .......................................................................... 6

Locating The Heater .................................................................. 6

Clearances................................................................................. 6

Hard Water ................................................................................ 6

Air Requirements ....................................................................... 6-7

Unconﬁ ned Space ..................................................................... 7

Conﬁ ned Space ......................................................................... 7

Venting ....................................................................................... 7-8

Vent Connection ........................................................................ 8

Thermometers ........................................................................... 8

Combination Water (Potable) and Space Heating ..................... 8

Mixing Valves ............................................................................. 8

System Connections .................................................................. 9

Relief Valve ............................................................................... 9

Gas Piping ................................................................................ 9

Page

Purging ..................................................................................... 10

Gas Meter Size ......................................................................... 10

Gas Pressure Regulator ........................................................... 10

OPERATION ................................................................................. 10

To Operate The Heater ............................................................. 10

Heater Wiring ............................................................................ 11

Lighting Instructions .................................................................. 12

Temperature Regulation ........................................................... 13

Checking Venting ...................................................................... 13

HIgh Temperature Limit Switch ................................................. 13

SERVICE INFORMATION ............................................................ 14-15

Main Burner and Igniter ............................................................ 14

Checking Gas Input .................................................................. 14

Vent System.............................................................................. 14

Blower Maintenance ................................................................. 15

Relief Valve ............................................................................... 15

Hot Water Odor ......................................................................... 15

Winter Protection ...................................................................... 15

Replacement Parts ................................................................... 15

Draining and Flushing ............................................................... 15

CHECKLIST ................................................................................. 15-16

Condensation............................................................................ 16

Anode Rod Inspection .............................................................. 16

Service and Repair ................................................................... 16

TROUBLESHOOTING ................................................................. 17-19

GENERAL SAFETY

INFORMATION

PRECAUTIONS

DO NOT USE THIS WA TER HEA TER IF ANY P AR T HAS BEEN UNDER WATER. Immediately call a qualiﬁ ed service technician to inspect the water heater and to replace any part of the control system and any gas control which has been under water.

IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE BEEN MADE BY A QUALIFIED SERVICEMAN.

1. EXTERNAL FIRE.

2. DAMAGE.

3. FIRING WITHOUT WATER.

4. SOOTING. Heater must be protected from freezing downdrafts during shutdown periods.

PREPARING FOR THE INSTALLATION

1. Read the “General Safety” section, page 3 of this manual ﬁ rst and then the entire manual carefully. If you don’t follow the 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 the 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 all instructions are essential to the proper operation of the water heater and your safety. Since we cannot put everything on the ﬁ rst few pages, READ THE ENTIRE MANUAL BEFORE ATTEMPTING TO

INSTALL OR OPERATE THE WATER HEATER.

2. The installation must conform with these instructions and the local code authority having jurisdiction. In the absence of local codes, installations shall comply with the National Fuel Gas Code ANSI Z223.1/NFPA 54 current addition. This publication is available from the CSA International, 8501 East Pleasant Valley Rd., Cleveland Ohio 44131, or The 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 Figures 3 through 8A.

Examine the location to ensure the water heater complies with the

“Locating the New Water Heater” section in this manual.

5. For California installation this water heater must be braced, anchored, or strapped to avoid falling or moving during an earthquake. See instructions for correct installation procedures. Instructions may be obtained from California Ofﬁ ce 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 SCAQMD rule #1146.2 and districts having equivalent NOx requirements.

GROUNDING INSTRUCTIONS

This water heater must be grounded in accordance with the National Electrical Code and/or local codes. These must be followed in all cases.

This water heater must be connected to a grounded metal, permanent wiring system; or an equipment grounding conductor must be run with the circuit conductors and connected to the equipment grounding terminal or lead on the water heater, see Figure 5.

CHEMICAL VAPOR CORROSION

HIGH AL TITUDE INST ALLATIONS

CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN FAILURE AND RISK OF ASPHYXIATION.

Spray can propellants, cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals, calcium and sodium chloride (water softener salt), waxes, and process chemicals are typical compounds which are potentially corrosive. Do not store products of this sort near the heater. Also, air which is brought in contact with the heater should not contain any of these chemicals. If necessary, uncontaminated air should be obtained from remote or outside sources. The limited warranty is voided when failure of water heater is due to a corrosive atmosphere. (Refer to the limited warranty for complete terms and conditions.)

EXTENDED NON-USE PERIODS

WARNING

HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE). HYDROGEN GAS IS EXTREMELY FLAMMABLE.

these conditions, it is recommended that the hot water faucet be opened for several minutes at the kitchen sink before using any electrical water heater connected to the hot water system. If hydrogen is present, there will probably be an unusual sound such as air escaping through the pipe as the water begins to ﬂ ow.

OPEN FLAME NEAR THE FAUCET AT THE TIME IT IS OPEN.

WARNING

To reduce the risk of injury under

THERE SHOULD BE NO SMOKING OR

INSULATION BLANKETS

Insulation blankets available to the general public for external use on gas water heaters are not required for use on this water heater. The purpose of an insulation blanket is to reduce the standby heat loss encountered with storage tank water heaters. This water heater meets or exceeds the current edition of ASHRAE/IES 90.1 standards with respect to insulation and standby loss requirement making an insulation blanket unnecessary.

Water heaters covered in this manual have been tested and approved for installation at elevations up to 7,700 feet (2,347 m) above sea level. For installation above 7,700 feet (2,347 m), the water heater’s Btu input should be reduced at the rate of 4 percent for each 1,000 feet (305 m) above sea level which requires replacement of the burner oriﬁ ce in accordance with the National Fuel Gas Code ANSI Z223.1/NFPA 54. Contact your local gas supplier for further information.

Failure to replace the standard oriﬁ ce with the proper high altitude oriﬁ ce when installed at elevations above 7,700 feet (2,347 m) could result in improper and inefﬁ cient operation of the water heater, producing carbon monoxide gas in excess of the safe limits. This could result in serious injury or death. Contact your local gas supplier for any speciﬁ c changes that may be required in your area.

WARNING

Should you choose to apply an insulation blanket to this heater, you should follow these instructions. Failure to follow these instructions can result in ﬁ re, asphyxiation , serious personal injury or death.

• Do not apply insulation to the top of the water heater, as this will interfere with safe operation.

• Do not cover the outer door, thermostat or temperature & pressure relief valve.

• Do not allow insulation to come within 2" (5cm) of the ﬂ oor to prevent blockage of combustion air ﬂ ow to the burner.

• Do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference.

• Do obtain new warning and instruction labels from 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 ﬂ ow.

The input reduction is primarily achieved by reducing the size of the main burner oriﬁ ces. To do this, the main burner oriﬁ ces require replacement with oriﬁ ces sized for the particular installation elevation. Correct oriﬁ ce sizing and parts may be obtained from your distributor or manufacturer. When ordering, be sure to state the model number and the altitude of the location where the water heater is being installed.

Upon completion of derating of the heater, adjustment to the gas pressure regulator may be required. See CHECKING THE GAS INPUT section in this manual for inlet and manifold pressure requirements.

Also due to the input rating reduction required at high altitudes, the output rating of the water heater is also reduced and should be compensated for in the sizing of the equipment for application.

CIRCULATING PUMP

A circulating pump is used when a system requires a circulating loop or there is a storage tank used in conjunction with the heater. Refer to the piping diagrams at rear of manual for electrical hookup information and install in accordance with the current edition of the National Electrical Code ANSI/NFPA No. 70.

Only all bronze circulating pumps are used with commercial water heaters. Although circulators are oiled and operated by the manufacturer some circulators must be oiled again before operating. Please refer to manufacturer’s instructions.

INSTALLATION INSTRUCTIONS

REQUIRED ABILITY

INSTALLATION OR SERVICE OF THIS WATER HEATER REQUIRES ABILITY EQUIV ALENT TO THAT OF A LICENSED TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR SUPPL Y, VENTING, ELECTRICAL AND GAS SUPPLY WORK ARE REQUIRED.

LOCATING THE HEATER

WARNING

THERE IS A RISK IN USING FUEL BURNING APPLIANCES SUCH AS GAS WATER HEATERS IN ROOMS, GARAGES OR OTHER AREAS WHERE GASOLINE, OTHER FLAMMABLE LIQUIDS OR ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE STORED, OPERATED OR REPAIRED. FLAMMABLE VAPORS ARE HEAVY AND TRAVEL ALONG THE FLOOR AND MAY BE IGNITED BY THE HEATER’S PILOT OR MAIN BURNER FLAMES CAUSING FIRE OR EXPLOSION.

SOME LOCAL CODES PERMIT OPERATION OF GAS APPLIANCES IF INSTALLED 18 INCHES (45.7 CM) OR MORE ABOVE THE FLOOR. THIS MAY REDUCE THE RISK IF LOCATION IN SUCH AN AREA CANNOT BE AVOIDED.

DO NOT INST ALL THIS W A TER HEA TER DIRECTL Y ON A CARPETED FLOOR. A FIRE HAZARD MA Y RESUL T. Instead the water heater must

be placed on a metal or wood panel extending beyond the full width and depth by at least 3 inches (7.6 cm) in any direction. If the heater is installed in a carpeted alcove or closet, the entire ﬂ oor shall be covered by the panel. Also, see the drain requirements.

THE WATER SUPPLY PRESSURE SHOULD NOT EXCEED 80 PSI (551.58 kPa). IF THIS OCCURS, A PRESSURE REDUCING VALVE WITH A BYPASS SHOULD BE PLACED ON THE SUPPLY TO THE ENTIRE HOUSE IN ORDER TO MAINTAIN EQUAL HOT AND COLD WATER PRESSURES.

THE HEATER SHOULD BE LOCA TED IN AN AREA WHERE LEAKAGE FROM THE HEATER OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE ADJACENT AREA OR TO LOWER FLOORS OF THE STRUCTURE.

WHEN SUCH LOCATIONS CANNOT BE AVOIDED, A SUITABLE DRAIN PAN SHOULD BE INSTALLED UNDER THE HEATER. Such pans should be fabricated with sides at least 2" (5cm) deep, with length and width at least 2" (5cm) greater than the diameter of the heater and must be piped to an adequate drain. The pan must not restrict combustion air ﬂ ow.

Drain pans suitable for these heaters are available from your distributor or Water Heater Parts Fulﬁ llment, 125 Southeast Parkway, Franklin, TN 37068.

For appliance installation locations with elevations above 7700 feet (610 meters), refer to HIGH ALTITUDE INSTALLATIONS section of this manual for input reduction procedure.

CLEARANCES

These heaters are approved for installation on combustible ﬂ ooring in a closet having a ceiling 12" (30.5cm) above top cover and with clearances to combustible construction of 6" (15.2cm) from ﬂ ue or vent connector, 0" (0cm) at the sides and rear and 5" (10.2cm) to front to prevent a possible ﬁ re hazard condition. A minimum of 4" (10.2cm) shall be allowed for installation of serviceable parts.

HARD WATER

Where hard water conditions exist, water softening or the threshold type of water treatment is recommended. This will protect the dishwashers, coffee urns, water heaters, water piping and other equipment.

See MAINTENANCE section for details of tank cleanout procedure.

AIR REQUIREMENTS

REFER TO THE CURRENT EDITION OF THE "NATIONAL FUEL GAS CODE ANSI Z223.1/NFPA 54.

KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE MATERIALS, GASOLINE AND OTHER FLAMMABLES, VAPORS AND LIQUIDS.

DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR VENTILATING AIR.

WARNING

ATTIC AND/OR EXHAUST FANS OPERATING ON THE PREMISES WITH A WATER HEATER CAN RESULT IN CARBON MONOXIDE POISONING AND DEATH.

THIS HEATER SHALL BE LOCATED OR PROTECTED SO IT IS NOT SUBJECT TO PHYSICAL DAMAGE BY A MOVING VEHICLE.

WARNING

FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY OTHER

POTENTIAL FIRE HAZARDOUS ARTICLES MUST NEVER BE PLACED ON OR ADJACENT TO THE HEATER. OPEN CONTAINERS OF FLAMMABLE MATERIAL SHOULD NOT BE STORED OR USED IN THE SAME ROOM WITH THE HEATER.

When installing the heater, consideration must be given to proper location. Location selected should be as close to the stack or chimney as practicable, with adequate air supply and as centralized with the piping system as possible.

THE HEATER MUST NOT BE LOCA TED IN AN AREA WHERE IT WILL BE SUBJECT TO FREEZING.

OPERATION OF THESE FANS CAN PRODUCE A NEGA TIVE DRAFT IN THE AREA OF THE W A TER HEA TER PREVENTING THE PRODUCTS OF COMBUSTION FROM EXHAUSTING THROUGH THE CHIMNEY OR VENT PIPE.

The venting of the water heater should be inspected by a qualiﬁ ed service technician at the time of installation and periodically thereafter to ensure a down-draft condition does not exist.

WARNING

FOR SAFE OPERATION PROVIDE ADEQUA TE AIR FOR COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPL Y OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION PRODUCTS RESULTING IN AIR CONTAMINATION THAT MAY BE HAZARDOUS TO LIFE. SUCH A CONDITION OFTEN WILL RESULT IN A YELLOW, LUMINOUS BURNER FLAME, CAUSING CARBONING OR SOOTING OF THE COMBUSTION CHAMBER, BURNERS AND FLUE TUBES AND CREATES A RISK OF ASPHYXIATION.

Where an exhaust fan is supplied in the same room with a heater, sufﬁ cient openings for air must be provided in the walls.

UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO THE ROOM THROUGH THE CHIMNEY, CAUSING POOR COMBUSTION. SOOTING MAY RESULT IN SERIOUS DAMAGE TO THE HEATER AND RISK OF FIRE OR EXPLOSION.

DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND VENTILATION MUST BE PROVIDED FOR SAFE OPERATION.

UNCONFINED SPACE

In buildings of conventional frame, brick, or stone construction, unconﬁ ned spaces may provide adequate air for combustion, ventilation and draft hood dilution.

If the unconﬁ ned space is within a building of tight construction (buildings using the following construction: weather stripping, heavy insulation, caulking, vapor barrier, etc.), air for combustion, ventilation and draft hood dilution must be obtained from outdoors. The installation instructions for conﬁ ned spaces in tightly constructed buildings must be followed to ensure adequate air supply.

CONFINED SPACE

When drawing combustion and dilution air from inside a conventionally constructed building to a conﬁ ned space, such a space shall be provided with two permanent openings, ONE IN OR WITHIN 12 INCHES (30.5cm) OF THE ENCLOSURE TOP AND ONE IN OR WITHIN 12 INCHES (30.5cm) OF THE ENCLOSURE BOTTOM. Each opening shall have a free area of at least one square inch per 1000 Btuh (2,225mm

/Kw) of the total input of all appliances in the enclosure, but not less than 100 square inches (645 square cm).

If the conﬁ ned space is within a building of tight construction, air for combustion, ventilation, and draft hood dilution must be obtained from outdoors. When directly communicating with the outdoors or communicating with the outdoors through vertical ducts, two permanent openings, located in the above manner, shall be provided. Each opening shall have a free area of not less than one square inch per 4000 Btuh (8,900mm horizontal ducts are used, each opening shall have a free area of not less than one square inch per 2000 Btuh (4,450mm

/Kw) of the total input of all appliances in the enclosure. If

/Kw) of the total

input of all appliances in the enclosure.

VENTING

WARNING

THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULA TION OF FLUE GASES. SUCH CONDITIONS CAUSE SOOTING OR RISKS OF FIRE AND ASPHYXIATION.

This water heater must be protected from freezing downdrafts. Remove all soot or other obstructions from the chimney that will retard

a free draft. Type B venting is recommended with these water heaters. This water heater must be vented in compliance with all local codes, the

current edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and with the Category I Venting Table.

If any part of the vent system are exposed to ambient temperatures below 35 degrees F (2 degrees C) it must be insulated to prevent condensation.

• Do not connect the heater to a common vent or chimney with solid

SINGLE TEMPERATURE

MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER

WARNING TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT FIXTURES. SEE TEMPERA TURE REGULATION ON PAGE 11. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.

CIRCULATING RETURN LINE CONNECTIONS TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A". STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO COLD WATER INLET

VACUUM RELIEF VALVE *INSTALL PER LOCAL CODES.

CAUTION: IF BUILDING COLD WA TER SUPPL Y HAS A BACK-FLOW PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE, AN EXPANSION TANK MUST BE PROVIDED.

FIGURE 2.

fuel burning equipment. This practice is prohibited by many local building codes as is the practice of venting gas ﬁ red equipment to

the duct work of ventilation systems.

• Where a separate vent connection is not available and the vent pipe from the heater must be connected to a common vent with an oil burning furnace, the vent pipe should enter the smaller common vent or chimney at a point above the large vent pipe.

Excessive pressure may develop in such closed systems, causing premature tank failure or intermittent relief valve operation. This is not a warranty failure. An expansion tank or a similar device may be required in the inlet supply line between the appliance and the meter or valve to compensate for the thermal expansion of the water.

As water is heated, it expands (thermal expansion). In a closed system, the volume of water will increase. As the volume of water increases, there will be a corresponding increase in water pressure due to thermal expansion. Thermal expansion can cause premature tank failure (leakage). This type of failure is not covered under the limited warranty. Thermal expansion can also cause intermittent temperature-pressure relief valve operation: water discharged from the valve due to excessive pressure build up. The temperature-pressure relief valve is not intended for the constant relief of thermal expansion. This condition is not covered under the limited warranty.

A properly-sized thermal expansion tank should be installed on all closed systems to control the harmful effects of thermal expansion. Contact a plumbing service agency or your retail supplier reguarding the installation of a thermal expansion tank.

FIGURE 3.

VENT CONNECTION

Vent connections must be made to an adequate stack or chimney . Size and install proper size vent pipe. Do not reduce pipe size to less than that of the blower outlet.

Horizontal runs of vent pipe must have a minimum upward slope toward the chimney of 1/4 inch per foot (2cm per meter). Dampers or other obstructions must not be installed in between the heater and the blower. Be sure that the vent pipe does not extend beyond the inside wall of the chimney.

Where a continuous or intermittent back draft is found to exist, the cause must be determined and corrected. A special vent cap may be required. If the back draft cannot be corrected by the normal methods or if a suitable draft cannot be obtained, a blower type ﬂ ue gas exhauster must be employed to assure proper venting and correct combustion.

THERMOMETERS (Not Supplied)

Thermometers should be obtained and ﬁ eld installed as shown in Figure 3. Thermometers are installed in the system as a means of detecting the

temperature of the outlet water supply.

COMBINATION WATER (POTABLE) HEATING

AND SPACE HEATING

1. All piping components connected to this unit for space heating applications shall be suitable for use with potable water.

2. These water heaters connot be used in space heating applications only.

3. Toxic chemicals, such as those used for boiler treatment, shall NEVER be introduced into this system.

4. This unit may NEVER be connected to any existing heating system or component(s) previously used with a non-potable water heating

appliance.

5. When the system requires water for space heating at temperatures higher than required for domestic water purposes, a tempering valve must be installed. Please refer to installation diagram on page 6 of

this manual for suggested piping arrangements.

CAUTION

A closed system will exist if a check valve (without bypass), pressure reducing valve (without bypass), or a water meter (without bypass) is installed in the cold water line between the water heater and street main (or well).

MIXING VALVES

DANGER

Water heated to a temperature which will satisfy 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 temperatures at the point of use to exceed the water heater’s temperature setting by up to 20°F (11°C).

Some people are more likely to be permanently injured by hot water than others. These include the elderly , children, the inﬁ rm and the physically/ mentally disabled. Table 1 shows the approximate time-to-burn relationship for normal adult skin. If anyone using hot water provided by the water heater being installed ﬁ ts into one of these groups or if there is a local code or state law requiring a certain water temperature at the point of use, then special precautions must be taken.

In addition to application a Mixing Valve should be installed at water heater (see Figure 3) or at hot water taps to further reduce system water temperature.

Mixing valves are available at plumbing supply stores. Consult a Qualiﬁ ed Installer or Service Agency . Follow mixing valve manufacturer’s instructions for installation of the valves.

using lowest possible temperature setting that

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

satisﬁ es demand of

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