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.
1
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).
2
53 7/8
136.8
GENERAL SAFETY
3
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.
4
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.
5
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.
6
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
2
/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
2
/Kw) of the total input of all appliances in the enclosure. If
2
/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.
7
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.
8
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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