Water Heater Innovations 196284-001 User manual

1
PRINTEDINU.S.A. 1004
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER
ANDNOTIFYOWNERTOKEEP FORFUTUREREFERENCE.
COMMERCIAL GAS WATER HEATER
Glass-Lined Tank-Type Water Heater
PART NO. 196284-001
• INSTALLATION • OPERATION • SERVICE • MAINTENANCE
Thank you for buying this energy efficient water heater. We
appreciateyourconfidenceinourproducts.
CAUTION
TEXT IN BLACK BOLD TYPE OR UNDERLINED
CONTAINS INFORMATION RELATIVE TO YOUR
SAFETY. PLEASE READ THOROUGHLYBEFORE
INSTALLINGANDUSINGTHISAPPLIANCE.

2
FOREWORD
The design of models ***-75 and 100 comply with the latest version
of ANSI Z21.10.3-CSA 4.3 as automatic storage or automatic
circulating tank type water heaters.
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
ROUGH-IN DIMENSIONS
FIGURE1
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 to these instructions and the local
code authority having jurisdiction. In the absence of local codes,
the installation must comply with the latest editions of the National
Fuel Gas Code,ANSI Z223.1/NFPA54. This publication is available
from the Canadian Standards Association, 8501 East Pleasant
Valley Road, Cleveland, OH 44131, or the National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.
UNDERSTANDINGYOURMODEL
Model Designator : Sample ***75 75 NE
*** = Letter Designator
75 = Gallons (Capacity of Unit)
75 = kBTU (Approx. Rating of Unit)
N = Gas Type (Natural)
E = 3 Year Warranty
DIMENSIONS
Model Units A B C D E F G H J K L M
75 Inches 61 1/8 58 1/2 29 11/16 26 1/2 15 3/16 4 14 1/2 16 1 1/4 1 1/2 11 15/16
Natural& LP CM 155.25 148.6 75.4 67.3 38.6 10.2 39.4 40.6 3.2 NPT NPT 30.3
100 Inches 69 3/4 66 1/2 29 11/16 26 1/2 15 3/16 4 14 1/2 16 1 1/4 1 1/4 1/2 11 15/16
Natural CM 177.2 168.9 75.4 67.3 38.6 10.2 39.4 40.6 3.2 NPT NPT 30.3
100 Inches 68 5/8 66 1/2 30 15/16 27 3/4 15 3/16 4 15 3/4 16 1 1/4 1 1/4 1/2 11 15/16
LP CM 174.3 168.9 78.59 70.5 38.6 10.2 40.0 40.6 3.2 NPT NPT 30.3

3
GENERAL SAFETY
INFORMATION
PRECAUTIONS
DO NOT USE THISAPPLIANCE IFANY PARTHAS BEEN UNDER
WATER. Immediately call a qualified service technician to inspect
the appliance and to replace any part of the control system and any
gas control which has been under water.
IF THE UNIT IS EXPOSED TO THE FOLLOWING, DO NOT
OPERATEHEATERUNTILALLCORRECTIVESTEPSHAVEBEEN
MADEBY AQUALIFIEDSERVICEMAN.
1. EXTERNALFIRE.
2. DAMAGE.
3. FIRINGWITHOUTWATER.
4. SOOTING
CHEMICAL VAPOR CORROSION
WARNING
CORROSIONOFTHEFLUEWAYSANDVENTSYSTEMMAYOCCUR
IFAIRFORCOMBUSTIONCONTAINSCERTAINCHEMICALVAPORS.
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.)
TABLE OF CONTENTS
Page
ROUGH-INDIMENSIONS ................................................................. 2
FOREWORD .................................................................................... 2
GENERALSAFETYINFORMATION ................................................ 3-4
Precautions................................................................................. 3
Chemical Vapor Corrosion ......................................................... 3
ImproperCombustion.................................................................. 3
Liquid Petroleum Models ............................................................. 3-4
Extended Non-use Periods ........................................................ 4
Insulation Blankets...................................................................... 4
CirculatingPump ......................................................................... 4
INSTALLATIONINSTRUCTIONS ...................................................... 4-9
RequiredAbility ........................................................................... 4
Locating The Heater ................................................................... 4-5
High Altitude Installations ........................................................... 5
Clearances ................................................................................. 5
Hard Water ................................................................................. 5
Air Requirements........................................................................ 5-6
Water (Potable) Heating and Space Heating ............................. 6
Venting........................................................................................ 6-7
Thermometers (Not Supplied) .................................................... 7
Relief Valve................................................................................. 7
GasPiping................................................................................... 7-8
Gas Pressure Regulator ............................................................ 9
OPERATION..................................................................................... 9-13
To Operate The Water Heater .................................................... 9
Purging ........................................................................................ 9
Lighting Instructions ................................................................... 10-11
TemperatureRegulation ............................................................. 12
Check Venting ............................................................................ 12-13
High Temperature Limit Switch................................................... 13
SERVICEINFORMATION ................................................................. 13-14
Pilot and Main Burner.................................................................. 13
Checking Gas Input .................................................................... 13-14
Vent System ............................................................................... 14
Relief Valve................................................................................. 14
Hot Water Odor .......................................................................... 14
Anode Rod Inspection ................................................................ 14
Winter Protection ........................................................................ 14
Replacement Parts ..................................................................... 14
PREVENTIVEMAINTENANCE ......................................................... 15-16
Recommended Procedure For Periodic Removal Of Lime
Deposits From Tank Type Commercial Water Heaters .............. 15
DelimingSolvents ....................................................................... 15
Tank Cleanout Procedure ........................................................... 15-16
CHECKLIST ..................................................................................... 16-17
NOTES ............................................................................................ 18
LIMITEDWARRANTY...................................................................... INSERT
IMPROPER COMBUSTION
WARNING
ATTICAND/OREXHAUST FANSOPERATINGON THEPREMISES
WITHAWATER HEATER CAN RESULT IN CARBON MONOXIDE
POISONINGANDDEATH.
OPERATIONOFTHESEFANSCANPRODUCEANEGATIVEDRAFT
IN THE AREA OF THE WATER HEATER PREVENTING THE
PRODUCTS OF COMBUSTION FROM EXHAUSTING THROUGH
THECHIMNEYOR VENTPIPE.
The venting of the water heater should be inspected by a qualified
service technician at the time of installation and periodically
thereafter to ensure a down-draft condition does not exist.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION AND
VENTILATING AIR. ADEQUATE AIR FOR COMBUSTION AND
VENTILATIONMUSTBE PROVIDEDFOR SAFEOPERATION.
LIQUID PETROLEUM MODELS
Water heaters for propane or liquefied petroleum gas (LPG) are
different from natural gas models. A natural gas heater will not
function safely on LP gas and no attempt should be made to
convert a heater from natural gas to LP gas.
LP gas must be used with great caution. It is highly explosive
and heavier than air. It collects first in the low areas making its
odor difficult to detect at nose level. If LP gas is present or even
suspected, do not attempt to find the cause yourself. Go to a
neighbor'shouse, leavingyourdoorsopen toventilatethe house,
then call your gas supplier or service agent. Keep area clear
until a service call has been made.
Attimes youmay notbe ableto smellan LPgas leak. Onecause
is odor fade, which is a loss of the chemical odorant that gives
LP gas its distinctive smell. Another cause can be your physical
condition, such as having a cold or diminishing sense of smell
with age. For these reasons, the use of a propane gas detector
is recommended.
Page

4
IFYOUEXPERIENCEANOUT-OF-GASSITUATION,DONOTTRYTO
RELIGHTAPPLIANCES YOURSELF, askyourLPdeliverypersonto
relight pilots for you. Only trained LP professionals should conduct
the required safety checks in accordance with industry standards.
EXTENDED NON-USE PERIODS
WARNING
HYDROGENGAS CAN BEPRODUCEDINAHOT WATERSYSTEM
SERVEDBYTHISHEATERTHATHASNOTBEENUSEDFORALONG
PERIOD OF TIME (GENERALLY TWO WEEKS OR MORE).
HYDROGENGAS ISEXTREMELYFLAMMABLE. Toreducetherisk
of injury under these conditions, it is recommended that the hot
water faucet be opened for several minutes at the kitchen sink
before using any electrical appliance 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
toflow. THERESHOULDBENOSMOKINGOR OPENFLAMENEAR
THEFAUCETATTHE TIME ITIS OPEN.
INSULATION BLANKETS
Insulation blankets available to the general public for external use
on gas water heaters are not approved for use on your commercial
water heater. The purpose of an insulation blanket is to reduce the
standby heat loss encountered with storage tank water heaters.
Your commercial water heater meets or exceeds the ASHRAE/IES
90.1b-1999 standards with respect to insulation and standby loss
requirement making an insulation blanket unnecessary.
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 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 draft hood.
• Do not cover the outer door, thermostat or temperature &
pressure relief valve.
• Do not allow insulation to come within 2" (5cm) of the floor to
prevent blockage of combustion air flow 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 your
commercial water heater company 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.
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.
Install the system in accordance with the latest version of the
National Electric Code ANSI/NFPANo. 70.

5
Drain pans suitable for these heaters are available from your
distributor or Apcom Inc., 125 Southwest Parkway, Franklin,
TN 37065 or contact them by phone, 615-794-5574 or fax
615-791-0660.
Water heater life depends upon water quality, water pressure and
the environment in which the water heater is installed. Water heat-
ers are sometimes installed in locations where leakage may re-
sult in property damage, even with the use of a drain pan piped to
a drain. However, unanticipated damage can be reduced or pre-
vented by a leak detector or water shutoff device used in conjunc-
tion with a piped 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 drain pan that trigger an alarm or turn
off the incoming water to the water heater when leakage is
detected.
• Sensors mounted in the drain pan that turn off the water supply
to the entire home when water is detected in the drain pan.
• Water supply shutoff 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.
For appliance installation locations with elevations above 2000
feet(610meters),refertoHIGHALTITUDEINSTALLATIONSsection
of this manual for input reduction procedure.
HIGH ALTITUDE INSTALLATIONS
WARNING
INSTALLATIONS ABOVE 2000 FEET (610 METERS) REQUIRE
REPLACEMENTOFTHEBURNERORIFICEINACCORDANCEWITH
SECTION8.1.2OFTHENATIONALFUELGAS CODE(ANSIZ223.1).
FAILURE TO REPLACETHE ORIFICEWILLRESULTINIMPROPER
ANDINEFFICIENTOPERATIONOFTHEAPPLIANCERESULTINGIN
THEPRODUCTIONOFINCREASEDLEVELSOFCARBONMONOXIDE
GAS IN EXCESS OF SAFE LIMITS WHICH COULD RESULT IN
SERIOUSPERSONALINJURYORDEATH.
You should contact your gas supplier for any specific changes
which may be required in your area.
As elevation above sea level is increased, there is less oxygen per
cubic foot of air. Therefore, the heater input rate should be reduced
at high altitudes for satisfactory operation with the reduced oxygen
supply. Failure to make this reduction would result in an overfiring
of the heater causing sooting, poor combustion and/or
unsatisfactory heater performance.
Ratings specified by manufacturers for most appliances apply for
elevations up to 2000 feet (610m). For elevations above 2000 feet
(610m), ratings must be reduced at the rate of 4% for each 1000
feet (305m) above sea level. For example, if a heater is rated at
75,100 Btu/Hr (22.0 kW) at sea level, to rate the heater at 4000 feet
(1219m), you subtract 4 (once for each thousand feet) x 0.04 (4%
input reduction) x 75,100 Btu/Hr (original rating) from the original
rating. Therefore, to calculate the input rating at 4000 feet (1219m):
4 x 0.04 x 75,100 Btu/Hr = 12,016 Btu/Hr (3.5 kW); 75,100 Btu/Hr
(22.0 kW) - 12,016 Btu/Hr (3.5 kW) = 63,084 Btu/Hr (18.5 kW). At
6000 feet (1829m) the correct input rating should be 57,076 Btu/Hr
(16.7 kW).
The input reduction is primarily achieved by reducing the size
of the main burner orifices. To do this, the main burner
orifices require replacement with orifices sized for the particular
installation elevation. Correct orifice sizing and parts may be
obtained from Apcom Inc., 125 Southwest Parkway, Franklin, TN
37065 or contact them by phone, 615-794-5574 or fax
615-791-0660. 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 INPUT
section in this manual for inlet and manifold pressure
requirements.
Also due to the input rating reduction required at high altitudes, the
recovery rating of the appliance is also reduced and should be
compensated for in the sizing of the equipment for application.
CLEARANCES
These heaters are approved for installation on combustible flooring
in a closet having a ceiling 12" (30.5cm) above top cover and with
clearances to combustible construction of 6" (15.2cm) from flue or
vent connector, 0" (0cm) at the sides and rear and 4" (10.1cm) to
front to prevent a possible fire hazard condition. A minimum of 4"
(10.1cm) 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 PREVENTIVE MAINTENANCE section for details of tank
cleanout procedure.
AIR REQUIREMENTS
REFERTOTHE LATESTEDITION OFTHE"NATIONALFUELGAS
CODE"ANSI Z223.1/NFPA54.
KEEP APPLIANCE AREA CLEAR AND FREE OF COMBUSTIBLE
MATERIALS,GASOLINEANDOTHERFLAMMABLES,VAPORSAND
LIQUIDS.
DONOTOBSTRUCTTHEFLOWOFCOMBUSTIONORVENTILATING
AIR.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
COMBUSTIONAND VENTILATION. AN INSUFFICIENTSUPPLYOF
AIRWILLCAUSE RECIRCULATIONOFCOMBUSTIONPRODUCTS
RESULTINGINAIR CONTAMINATION THATMAYBEHAZARDOUS
TOLIFE. SUCHACONDITIONOFTENWILLRESULTINAYELLOW,
LUMINOUSBURNERFLAME,CAUSINGCARBONINGORSOOTING
OFTHE COMBUSTIONCHAMBER,BURNERS ANDFLUETUBES
ANDCREATESARISKOFASPHYXIATION.
Where an exhaust fan is supplied in the same room with a heater,
sufficient openings for air must be provided in the walls.
UNDERSIZEDOPENINGS WILLCAUSEAIR TOBEDRAWNINTO
THE ROOM THROUGH THE CHIMNEY, CAUSING POOR
COMBUSTION. SOOTINGMAYRESULTIN SERIOUSDAMAGE TO
THEHEATERANDRISKOFFIREOREXPLOSION.
UNCONFINEDSPACE
In buildings of conventional frame, brick, or stone construction,
unconfined spaces may provide adequate air for combustion,
ventilation and draft hood dilution.

6
If the unconfined 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 confined spaces in tightly
constructed buildings must be followed to ensure adequate air
supply.
CONFINEDSPACE
When drawing combustion and dilution air from inside a
conventionally constructed building to a confined space, such a
space shall be provided with two permanent openings, ONE IN
ORWITHIN12 INCHES(305mm)OFTHE ENCLOSURETOPAND
ONE IN OR WITHIN 12 INCHES (305mm) OF THE ENCLOSURE
BOTTOM. Each opening shall have a free area of at least one
square inch per 1000 Btu/Hr (2203mm2/kW) of the total input of all
appliances in the enclosure, but not less than 100 square inches
(645cm2).
If the confined 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 Btu/Hr (551mm2/kW) of the total input of all
appliances in the enclosure. If horizontal ducts are used, each
opening shall have a free area of not less than one square inch
per 2000 Btu/Hr (1102mm2/kW) of the total input of all appliances
in the enclosure.
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. Toxic chemicals, such as those used for boiler treatment, shall
NEVER be introduced into this system.
3. This unit may NEVER be connected to any existing heating
system or component(s) previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating at
temperatures higher than required for domestic water
purposes, a tempering valve must be installed. see Figure 4.
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).
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 is required in the inlet supply line between the
appliance and the meter or valve to compensate for the thermal
expansion of the water.
SYSTEMCONNECTIONS
The system installation must conform to these instructions and to
the local code authority having jurisdiction. Good practice requires
that all heavy piping be supported.
VENTING
WARNING
THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE
FOLLOWEDTOAVOIDCHOKEDCOMBUSTIONORRECIRCULATION
OFFLUEGASES. SUCHCONDITIONSCAUSESOOTINGORRISKS
OFFIREANDASPHYXIATION.
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 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) and with the Category I Venting Tables.
If any part of the vent system is 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
any oil-fired or solid fuel burning equipment. This practice is
prohibited by many local building codes as is the practice of
venting gas fired equipment to the duct work of ventilation
systems.
FIGURE2
DRAFTHOOD
The draft hood furnished with this heater must be installed without
alteration. Provision must be made if it is installed in confined
space or a small room to accommodate draft hood spillage and
avoid risks described in previous steps. The upper air opening
called for in the AIR REQUIREMENTS section of this manual is for
this purpose.
Locate the 3 brackets and 6 screws in the installation instruction
bag. Secure each bracket to the draft hood leg with the screws
furnished. Place the draft hood on the water heater so that legs of
the draft hood fit into the slots on the jacket top, see figure 3. Once
the draft hood (with brackets attached) is in place, drill a small pilot
hole through bracket hole into the jacket top. WARNING, DO NOT
PENETRATE THE JACKET TOP BY MORE THAN 1/4" (6.4 mm).
Secure the brackets to the jacket top with the screws furnished,
see Figure 3.
FIGURE 3.

7
VENTCONNECTION
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 draft hood outlet.
Horizontal runs of vent pipe must have a minimum upward slope
toward the chimney of 1/4 inch per foot. Dampers or other
obstructions must not be installed in between the heater and the
draft hood. 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 flue
gas exhauster must be employed to assure proper venting and
correct combustion.
THERMOMETERS (Not Supplied)
Thermometers should be obtained and field installed as shown,
see Figure 4.
Thermometers are installed in the system as a means of detecting
the temperature of the outlet water supply.
RELIEF VALVE
This water heater is equipped with a combination temperature-
pressure relief valve that complies with the standard for relief valves
for hot water supply systems, ANSI Z21.22/CSA 4.4. FOR SAFE
OPERATIONOFTHEWATERHEATER,THERELIEFVALVE(S)MUST
NOTBEREMOVEDORPLUGGED.
ASME ratings cover pressure relief capacities. ANSI ratings cover
release rate with temperature actuation.
In addition to the appliance relief valve, each remote storage tank
which may be used in conjunction with this appliance shall also be
installed with a properly sized, rated and approved combination
temperature (ANSI) and pressure (ASME) relief valve(s).
WARNING
THE PURPOSE OF RELIEF VALVE IS TO AVOID EXCESSIVE
PRESSUREORTEMPERATUREINTOTHESTEAMRANGE, WHICH
MAYCAUSESCALDINGATFIXTURES,TANKEXPLOSION,SYSTEM
ORHEATERDAMAGE. NO VALVE ISTOBE PLACEDBETWEEN
THERELIEFVALVEANDTANK.
Your local code authority may have other specific relief valve
requirements.
ADRAIN LINEMUSTBE CONNECTEDTOTHE RELIEFVALVE TO
DIRECTDISCHARGETOASAFELOCATIONTOAVOIDSCALDING
ORWATERDAMAGE. THISLINEMUST NOTBEREDUCEDFROM
THE SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN
VALVES, RESTRICTIONS NOR SHOULD IT BE LOCATED IN
FREEZINGAREAS. DO NOTTHREADOR CAPTHEEND OFTHIS
LINE. RESTRICTEDORBLOCKEDDISCHARGEWILLDEFEATTHE
PURPOSEOFTHEVALVEANDISUNSAFE. DISCHARGELINESHALL
BEINSTALLEDTOALLOWCOMPLETEDRAINAGE OFBOTH THE
VALVEANDLINE.
See SERVICE INFORMATION section for procedure and
precautions.
Thetype,sizeandlocation ofthe reliefvalves mustbein accordance
with local codes. The locations of the relief valves shown in the
installation diagrams are typical. The heater has a factory installed
high temperature limit switch.
For circulating heaters, the separate storage vessel must have a
temperature and pressure relief valve installed. This valve shall
comply with the standard for relief valves and automatic gas shutoff
devices for hot water supply systems.
Cold water inlet lines to heater should be installed as shown in
order to minimize gravity circulation of hot water to building cold
water lines.
GAS PIPING
Contact your local gas service company to ensure that adequate
gas service is available and to review applicable installation codes
for your area.
FIGURE4.
CIRCULATING RETURN LINE CONNECTIONS
TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A".
STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO
COLDWATERINLET.
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-
FLOWPREVENTER,CHECKVALVE ORWATERMETERWITHCHECK
VALVE,PROVISIONSFORTHERMALEXPANSIONOFWATERINTHE
HOT WATER SYSTEMMUST BE PROVIDED.
WARNING
TEMPERATURESETTINGSHOULD NOT EXCEEDSAFEUSE TEMPERATURE
AT FIXTURES. SEE TEMPERATURE REGULATION ON PAGE 12. IF HIGHER
PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTEROUTPUT,ADDAN ANTI-SCALD VALVE FORHOT WATERSUPPLIED
TO FIXTURES.
SINGLETEMPERATURE
MIXING VALVE APPLICATION FOR
TWOTEMPERATUREWATER VACUUM RELIEF
VALVE
*INSTALLPER
LOCAL CODES

8
Size the main gas line in accordance with Table 1. The figures
shown are for straight lengths of pipe at 0.5 in. W.C. pressure
drop, which is considered normal for low pressure systems. Note:
Fittings such as elbows, tees and line regulators will add to the
pipe pressure drop. Also refer to the latest version of the National
Fuel Gas Code.
TABLE1- GASSUPPLYLINE SIZES(ININCHES)*
MAXIMUMCAPACITYOFPIPEIN
CUBICFEETPERHOUR
LENGTH
IN
FEET 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
10 175 360 680 1400 2100 3960 6300 11000 23000
20 120 250 465 950 1460 2750 4360 7700 15800
30 97 200 375 770 1180 2200 3520 6250 12800
40 82 170 320 660 990 1900 3000 5300 10900
50 73 151 285 580 900 1680 2650 4750 9700
60 66 138 260 530 810 1520 2400 4300 8800
70 61 125 240 490 750 1400 2250 3900 8100
80 57 118 220 460 690 1300 2050 3700 7500
90 53 110 205 430 650 1220 1950 3450 7200
100 50 103 195 400 620 1150 1850 3250 6700
125 44 93 175 360 550 1020 1650 2950 6000
150 40 84 160 325 500 950 1500 2650 5500
175 37 77 145 300 460 850 1370 2450 5000
200 35 72 135 280 430 800 1280 2280 4600
LENGTH
IN
METERS 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
351 105 199 410 615 1160 1845 3221 6735
635 73 142 278 428 805 1277 2255 4626
928 59 110 225 346 644 1031 1830 3748
12 24 50 94 193 290 556 878 1552 3192
15 21 44 83 170 264 492 776 1391 2840
18 19 40 76 155 237 445 703 1259 2577
21 18 37 70 143 220 410 659 1142 2372
24 17 35 64 135 202 381 600 1083 2196
27 16 32 60 126 190 357 571 1010 2108
31 15 30 57 117 182 337 542 952 1962
38 13 27 51 105 161 299 483 864 1757
46 12 25 47 95 146 278 439 776 1610
53 11 23 42 88 135 249 401 717 1464
61 10 21 40 82 126 234 375 688 1347
WARNING
THEHEATERISNOTINTENDEDFOROPERATIONATHIGHERTHAN
14.0" W.C.(3.48 kPa) - NATURAL GAS OR 14.0" W.C. (3.48 kPa) -
PROPANE GAS SUPPLY PRESSURE. EXPOSURE TO HIGHER
SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE GAS VALVE
WHICH COULD RESULT IN FIRE OR EXPLOSION. IF
OVERPRESSUREHASOCCURREDSUCHASTHROUGHIMPROPER
TESTINGOFGASLINESOREMERGENCYMALFUNCTIONOFTHE
SUPPLYSYSTEM,THEGASVALVEMUSTBECHECKEDFORSAFE
OPERATION. MAKE SURE THAT THE OUTSIDE VENTS ON THE
SUPPLYREGULATORS AND THE SAFETY VENT VALVESARE
PROTECTEDAGAINST BLOCKAGE. THESEAREPARTSOFTHE
GASSUPPLYSYSTEM,NOTTHEHEATER. VENTBLOCKAGEMAY
OCCUR DURING ICE STORMS. IT IS IMPORTANT TO GUARD
AGAINSTGASVALVEFOULINGFROMCONTAMINANTSINTHEGAS
WAYS. SUCHFOULINGMAYCAUSEIMPROPEROPERATION,FIRE
OREXPLOSION.
IFCOPPERSUPPLYLINESAREUSEDTHEYMUSTBEINTERNALLY
TINNEDANDCERTIFIEDFORGASSERVICE.BEFOREATTACHING
THEGAS LINE,BE SURETHATALLGASPIPE ISCLEAN ONTHE
INSIDE.
TOTRAPANY DIRTOR FOREIGNMATERIALIN THEGAS SUPPLY
LINE,ADIRTLEG(SOMETIMESCALLEDSEDIMENTTRAPORDRIP
LEG)MUST BEINCORPORATED INTHEPIPING (SEEFIGURE 5).
THEDIRTLEGMUSTBEREADILYACCESSIBLEANDNOTSUBJECT
TO FREEZING CONDITIONS. INSTALL INACCORDANCE WITH
RECOMMENDATIONSOFSERVINGGAS SUPPLIERS. REFERTO
THELATESTVERSIONOFTHENATIONALFUELGASCODE.
GAS PIPING AND DIRT LEG INSTALLATION
FIGURE5.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the male
threads of pipe joints. Do not apply compounds to the first two
threads. Use compounds resistant to the action of liquefied
petroleum gases.
BEFOREPLACINGTHEHEATERINOPERATION,CHECKFORGAS
LEAKAGE. Use soap and water solution or other material
acceptable for the purpose in locating the leaks. DO NOT USE
MATCHES,CANDLES,FLAMEOROTHERSOURCES OFIGNITION
FORTHISPURPOSE.
DISCONNECTTHEHEATERANDITSMANUALGASSHUTOFFVALVE
FROMTHE GASSUPPLY PIPINGSYSTEMDURINGANYSUPPLY
PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45 kPa). GAS
SUPPLYLINE MUSTBE CAPPEDWHEN DISCONNECTEDFROM
THEHEATERFOR TESTPRESSURES OF1/2 PSIG(3.45kPa) OR
LESS.THEAPPLIANCENEEDNOTBEDISCONNECTED,BUTMUST
BEISOLATEDFROMTHESUPPLYPRESSURETESTBYCLOSING
THEMANUALGASSHUTOFFVALVE.
GASMETERSIZE
Be sure the gas meter has sufficient capacity to supply the full
rated gas input of the water heater as well as the requirements of
all other gas fired equipment supplied by the meter. If gas meter is
too small, ask the gas company to install a larger meter having
adequate capacity.
NOMINAL IRON PIPE SIZES (INCHES)
INPUTIN THOUSANDS (BTU/HR)
NOMINAL IRON PIPE SIZES (INCHES)
INPUT IN KW

9
THERMOSTATFORNATURALANDPROPANEGASES
FIGURE6.
GAS PRESSURE REGULATOR
The gas pressure regulator is built into the gas valve and is
equipped to operate on the gas specified on model and rating
plate. The regulator is factory adjusted to deliver gas to burner at
correct water column pressure allowing for a nominal pressure
drop through the controls.
The minimum gas supply pressure for input adjustment must not
be less than 5.0" W.C. (1.24 kPa) for natural gas and 11.0" W.C.
(2.74 kPa) for propane gas.
Do not subject the combination gas valve to inlet gas
pressures of more than 14.0" W.C. (3.48 kPa). A service
regulator is necessary if higher gas pressures are encountered.
Gas pressure specified in Table 2, refer to flow pressure taken at
pressure tap of automatic gas valve while heater is operating.
OPERATION
It is recommended that a qualified person perform the initial firing
of the heater. At this time the user should not hesitate to ask the
individual any questions which he may have in regard to the
operation and maintenance of the unit.
WARNING
DO NOT ATTEMPT TO OPERATE WATER HEATER WITH COLD
WATERINLETVALVECLOSED.
NEVEROPERATETHEHEATERWITHOUTFIRSTBEINGCERTAINIT
ISFILLED WITHWATERANDA TEMPERATUREANDPRESSURE
RELIEFVALVEISINSTALLEDINTHE RELIEFVALVEOPENINGOF
THEHEATER. DONOTATTEMPTTOOPERATEHEATERWITHCOLD
WATERINLETVALVECLOSED.
TO OPERATE THE WATER HEATER
1. Close the heater drain valve by turning handle clockwise .
2. Open a nearby hot water faucet to permit the air in the system
to escape.
3. Fully open the cold water inlet pipe valve allowing the heater
and piping to be filled.
4. Close the hot water faucet as water starts to flow.
5. The heater is ready to be operated.
A checklist is included in the SERVICE INFORMATION section of
this manual. By using this checklist the user may be able to make
minor operational adjustments and save himself unnecessary
service calls. However, the user should not attempt repairs which
are not listed in this section.
PURGING
Gas line purging is required with new piping or systems in which
air has entered.
CAUTION
PURGINGSHOULDBEPERFORMEDBYPERSONSEXPERIENCED
IN THIS TYPE GAS SERVICE. TO AVOID RISK OF FIRE OR
EXPLOSION,PURGE DISCHARGEMUST NOTENTERCONFINED
AREASOR SPACESWHERE IGNITIONCAN OCCUR. THEAREA
MUST BE WELL VENTILATED ANDALL SOURCES OF IGNITION
MUSTBEINACTIVATEDORREMOVED.
TABLE2.
MANIFOLDPRESSURESETTING
Model Type of Manifold
Number Gas Input Pressure
***-75 Natural 75,100 Btu/hr 22 kW 4.0 in. W.C. 1.0 kPa
***-75 Propane 75,100 Btu/hr 22 kW 10.0 in. W.C. 2.5 kPa
***-100 Natural 75,100 Btu/hr 22 kW 4.0 in. W.C. 1.0 kPa
***-100 Propane 75,100 Btu/hr 22 kW 10.0 in. W.C. 2.5 kPa

10
FORYOURSAFETYREADBEFORELIGHTING
BEFORE LIGHTING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGEDAT FAUCETS.
WARNING: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss of life.
1. STOP! Read the safety information above
on this label.
2. Set the thermostat to the lowest setting by turning
thermostat dial fully clockwise until it stops.
3. Push the gas control knob down slightly and turn
clockwise to "OFF" (FigureA).
NOTE: Gas control knob CANNOT be turned from
"PILOT" to "OFF" unless it is pushed down slightly.
Do not force.
4. Remove the inner and outer doors located below
and behind the gas control unit.
5. Wait five (5) minutes to clear out any gas. If you
then smellgas STOP! Follow"B" inthe safety
information above on this label. If you
do not smell gas, go to the next step.
6. Find Pilot: Follow metal tube from the bottom, right
of the gas control to the pilot burner (Figure D).
7. Turn gas control knob counterclockwise to
"PILOT" (Figure B).
8. Push gas control knob down all the way and hold it
down. Immediately light the pilot with a match.
Continue to hold the gas control knob down for
about one (1) minute after the pilot is lit. Release
the gas control knob and it will pop back up. Pilot
should remain lit. If it goes out, repeat Steps 3
through 8. It may take several minutes for air to
clear the lines, before the pilot will light.
•If knob does not pop up when released, stop
and immediately call your service technician
or gas supplier.
•If the pilot will not stay lit after several tries, turn
the gas control knob to "OFF" (Figure A) and
call your service technician or gas supplier.
9. Replace inner and outer burner doors.
10. At arm's length away, turn gas control knob
counterclockwise to on (Figure C).
11. Set thermostat to desired setting (See Figure).
CAUTION: Hotter water increases the risk
of scald injury. Consult the instruction
manual before changing temperature.
LIGHTINGINSTRUCTIONS
TOTURNOFF GAS TOAPPLIANCE
1. Set the thermostat to lowest setting. 2. Push the gas control knob down slightly and turn
clockwise to "OFF". (FigureA). Do not force.
TOP VIEW FIGURE“D”
A.. This appliance has a pilot which must be lighted
by hand. When lighting the pilot, follow these
instructions exactly.
B. BEFORELIGHTING: smellall aroundtheappliance
area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will
settle on the floor.
WHAT TODO IFYOUSMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
fire department.
C. Use only your hand to push down or turn the gas
control knob. Never use tools. If the knob will not
push down or turn by hand, don’t try to repair it, call
a qualified service technician. Force or attempted
repair may result in a fire or explosion.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.
GAS CONTROL

11
FORYOURSAFETYREADBEFORELIGHTING
BEFORE LIGHTING: ENTIRE SYSTEM MUST BE FILLED WITH WATER AND AIR PURGEDAT FAUCETS.
WARNING: If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal injury or loss of life.
1. STOP! Read the safety information above
on this label.
2. Set the thermostat to the lowest setting by turning
thermostat dial fully clockwise until it stops.
3. Push the gas control knob down slightly and turn
clockwise to "OFF" (FigureA).
NOTE: Gas control knob CANNOT be turned from
"PILOT" to "OFF" unless it is pushed down slightly.
Do not force.
4. Remove the inner and outer burner doors located
below and behind the gas control unit.
5. Wait five (5) minutes to clear out any gas. If you
then smellgas STOP! Follow"B" inthe safety
information above on this label. If you
do not smell gas, go to the next step.
6. Find Pilot: Follow metal tube from the bottom, right
of the gas control to the pilot burner (Figure D).
7. Turn gas control knob counterclockwise to
"PILOT" (Figure B).
8. Push gas control knob down all the way and hold it
down. Immediately light the pilot with a match.
Continue to hold the gas control knob down for
about one (1) minute after the pilot is lit. Release
the gas control knob and it will pop back up. Pilot
should remain lit. If it goes out, repeat Steps 3
through 8. It may take several minutes for air to
clear the lines, before the pilot will light.
•If knob does not pop up when released, stop
and immediately call your service technician
or gas supplier.
•If the pilot will not stay lit after several tries, turn
the gas control knob to "OFF" (Figure A) and
call your service technician or gas supplier.
9. Replace inner and outer burner doors.
10. At arm's length away, turn gas control knob
counterclockwise to on (Figure C).
11. Set thermostat to desired setting (See Figure).
CAUTION: Hotter water increases the risk
of scald injury. Consult the instruction
manual before changing temperature.
LIGHTINGINSTRUCTIONS
TOTURN OFF GASTOAPPLIANCE
1. Set the thermostat to lowest setting. 2. Push the gas control knob down slightly and turn
clockwise to "OFF" (Figure A). Do not force.
TOP VIEW FIGURE“D”
A. This appliance has a pilot which must be lighted
by hand. When lighting the pilot, follow these
instructions exactly.
B. BEFORELIGHTING: smellall aroundtheappliance
area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will
settle on the floor.
WHAT TO DOIF YOUSMELLGAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
fire department.
C. Use only your hand to push down or turn the gas
control knob. Never use tools. If the knob will not
push down or turn by hand, don’t try to repair it, call
a qualified service technician. Force or attempted
repair may result in a fire or explosion.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas control
which has been under water.
GAS CONTROL

12
TEMPERATURE REGULATION
DANGER
THIS WATER HEATER IS EQUIPPED WITH AN ADJUSTABLE
THERMOSTATTOCONTROLWATERTEMPERATURE.HOTWATER
TEMPERATURESREQUIREDFORAUTOMATICDISHWASHERAND
LAUNDRYUSECANCAUSEPAINFULSCALDINGWITHPOSSIBLE
SERIOUS AND PERMANENT INJURY. THE TEMPERATURE AT
WHICHINJURY OCCURSVARIESWITH THEPERSON’SAGEAND
THETIMEOFTHE EXPOSURE.THESLOWERRESPONSETIMEOF
CHILDREN, AGED OR DISABLED PERSONS INCREASES THE
HAZARDSTOTHEM.NEVERALLOWSMALLCHILDRENTO USEA
HOTWATERTAP, ORTODRAW THEIROWNBATHWATER.NEVER
LEAVE A CHILD OR DISABLED PERSON UNATTENDED IN A
BATHTUB ORSHOWER.
THEWATERHEATERSHOULD BELOCATEDINANAREAWHERE
THEGENERALPUBLICDOES NOTHAVEACCESS.IFASUITABLE
AREAISNOTAVAILABLE,ACOVERSHOULDBEINSTALLEDOVER
THETHERMOSTATTO PREVENTTAMPERING. Suitablecoversare
available through Apcom Inc., 125 Southwest Parkway, Franklin,
TN 37065 or contact them by phone, 615-794-5574 or fax
615-791-0660.
Time to Produce 2nd & 3rd
Temperature Setting Degree Burns on Adult
VERYHOT= APPROX.180°F(82°C) Nearlyinstantaneous
D=APPROX.160°F(71°C) About 1/2second
C=APPROX.150°F(65°C) About 1-1/2seconds
B=APPROX.140°F(60°C) Less than 5 seconds
A=APPROX.130°F(54°C) About 30seconds
=APPROX.120°F (49°C) Morethan5minutes
LOW=APPROX.100°F(37.8°C) - - - - - - - -
FIGURE7.
It is recommended that lower water temperatures be used to avoid
the risk of scalding. It is further recommended, in all cases, that
the water temperature dial be set for the lowest temperature which
satisfies your hot water needs. This will also provide the most
energy efficient operation of the water heater. The water
temperature adjusting dial was factory set at the lowest
temperature; all the way clockwise to the mechanical stop. Turning
the dial counterclockwise increases temperature and clockwise
reduces temperature.
SETTINGTHE WATERHEATERTEMPERATUREAT120°F(49°C)
(APPROX." " MARKONFACEOFTHERMOSTAT)WILLREDUCE
THE RISK OF SCALDS. Some states require settings at specific
lower temperatures.
Figure 7 shows the approximate water temperatures produced at
various thermostat dial settings. Short repeated heating cycles
caused by small hot water uses can cause temperatures at the
point of use to exceed the thermostat setting by up to 20°F (11°C).
If you experience this type of use you should consider using lower
temperature settings to reduce scald hazards.
Valves for reducing point of use temperature by mixing cold and
hot water are available. Also available are inexpensive devices
that attach to faucets to limit hot water temperatures. Contact a
licensed plumber or the local plumbing authority.
CHECK VENTING
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while any
other appliances connected to the venting system are not in
operation.
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal pitch,
as required in the National Fuel Gas Code, ANSI Z223.1 and
these instructions. Determine that there is no blockage or
restriction, leakage, corrosion and other deficiencies which
could cause an unsafe condition.
3. So far as is practical, close all building doors and windows
and all doors between the space in which the water heater(s)
connected to the venting system are located and other spaces
of the building. Turn on all appliances not connected to the
venting system. Turn on all exhaust fans, such as range hoods
and bathroom exhausts, so they shall operate at maximum
speed. Close fireplace dampers.
4. Follow the lighting instruction. Place the water heater being
inspected in operation. Adjust thermostat so appliance shall
operate continuously.
5. Test for draft hood spillage at the relief opening after 5 minutes
of main burner operation.
6. After it has been determined that each appliance connected to
the venting system properly vents when tested as outlined
above, return doors, windows, exhaust fans, fireplace dampers
andanyother gasburningappliance totheir previousconditions
of use.
7. If improper venting is observed during any of the above tests,
the venting system must be corrected.
WARNING
FAILURE TO CORRECT BACK DRAFTS MAY CAUSE AIR
CONTAMINATIONANDUNSAFECONDITIONS.

13
• If the back draft cannot be corrected by the normal method or if
a suitable draft cannot be obtained, a blower type flue gas
exhauster must be employed to assure proper venting and
correct combustion.
HIGH TEMPERATURE LIMIT SWITCH
(Auto Reset Type Energy Cut Off)
TORESETAUTOMATICGASSHUTOFF
This water heater is equipped with a automatic reset type high
limit (Energy Cutoff) sensor. The high limit switch interrupts the
pilot and main burner gas flow should the water temperature reach
205°F (96°C). The high limit will automatically reset when the water
temperature drops below 140°F (60°C).
WARNING
THEGASVALVEMUSTHAVEBEENIN THEOFFPOSITIONFORAT
LEAST 5 MINUTES. This waiting period is an important safety
step. Its purpose is to permit gas that may have accumulated in
thecombustion chambertoclear. IF YOUDETECTGAS ODORAT
THE END OF THIS PERIOD DO NOT PROCEED WITH LIGHTING.
RECOGNIZE THAT GAS ODOR, EVEN IF IT SEEMS WEAK, MAY
INDICATEPRESENCEOFACCUMULATEDGASSOMEPLACEINTHE
AREAWITHRISKOFFIREOREXPLOSION. SEETHEFRONTPAGE
FORSTEPSTOBETAKEN.
Before lighting the pilot and operating the heater, the following
conditions must exist:
• Entire system filled with water.
• Air purged from all lines and no leaks (gas and water).
• All gas and water lines open.
SHOULDOVERHEATINGOCCUR ORTHE GASSUPPLYFAILTO
SHUTOFF,TURNOFFTHEMANUALGASCONTROLVALVETOTHE
APPLIANCE.
SERVICE INFORMATION
The installer may be able to observe and correct certain problems
which may arise when the unit is put into operation. HOWEVER, it
is recommended that only qualified servicemen, using appropriate
test equipment, be allowed to service the heater.
FOR YOUR SAFETY AND SATISFACTORY OPERATION, IT IS
RECOMMENDEDTHATTHISHEATERBECHECKEDONCEAYEAR
BYACOMPETENTSERVICEPERSON.
USERS OF THIS APPLIANCE SHOULD BE AWARE THAT GAS
COMPONENTSWEAR OUTOVER APERIOD OF TIME. THEGAS
CARRYING COMPONENTS OF THIS APPLIANCE SHOULD BE
INSPECTED FOR PROPER OPERATION PERIODICALLY BY A
QUALIFIEDSERVICETECHNICIAN.
PILOT AND MAIN BURNER
Check pilot and main burner (figure 8) every 12 months for proper
flame characteristics. This is done by removing door(s) on heater.
The main burner should provide complete combustion of gas;
ignite rapidly; give reasonably quiet operation; cause no excessive
flame lifting from the burner ports. Make sure that the flow of
combustion and ventilation air is not blocked.
PROPANE
NATURAL
FIGURE8.
If proper flame characteristics are not evident, check for
accumulation of lint or other foreign material that restricts or blocks
the air openings in the heater or burner.
WARNING
SOOT BUILD-UP INDICATES A PROBLEM THAT REQUIRES
CORRECTION BEFORE FURTHER USE. CONSULT WITH A
QUALIFIEDSERVICETECHNICIAN.
Should the main burner or burner air openings require cleaning,
turn off the gas to the water heater. Follow "to turn off gas to
appliance" on pages 10 and 11 and allow the burner to cool.
Remove the burner and clean with a soft brush. Clean main burner
orifice with a suitable soft material. Follow lighting instructions on
pages 10 and 11 to put the water heater back in operation.
CHECKFOR GOODFLOW OFCOMBUSTIONAND VENTILATING
AIRTOTHE UNIT. MAINTAINACLEAR OPENAREAAROUNDTHE
HEATER AT ALL TIMES. DO NOT STORE COMBUSTIBLES OR
FLAMMABLELIQUIDSNEARORAROUNDANAPPLIANCE.
CHECKING GAS INPUT
For appliance installation locations with elevation above 2000 ft.
(610m) refer to HIGH ALTITUDE INSTALLATIONS section of this
manual for input reduction procedure.
With this heater in operation, determine whether it is receiving the
full rated input of gas. This may be done by timing the gas meter
and measuring gas pressure with a gauge or manometer. When
the heater is operating at full capacity (full gas input) it should
consume approximately 1 cubic foot of gas in the time shown in
Table 3.

14
TABLE3.
INPUTCHECKTIMEREQUIREDTO
CONSUME1CU. FT. OFGAS
Approx. Time Required
Type of BTU Per To Consume 1 Cu. Ft.
Model Gas Cu. Ft. of Gas
***-75 Natural 1050 50.3 sec.
Propane 2500 119.8 sec.
***-100 Natural 1050 50.3 sec.
Propane 2500 119.8 sec.
Use this formula to “clock” the meter. Be sure that other gas
consuming appliances are not operating during this interval.
3,600 X H = Btu/Hr
T
T = Time in seconds needed to burn one cubic foot of gas.
H = Heating value of gas in Btu’s per cubic foot of gas.
Btu/Hr = Actual heater input rate.
Example: (Using ***-75 heater)
T = 50.3 seconds/ft3
H = 1,050 Btu/ft3(natural gas)
Btu/Hr = ?
3,600 X 1,050 = ~ 75,100 Btu/Hr (22.0kW)
50.3
Compare the actual input rate to that given on the heater’s rating
plate. In the example, the ***-75’s full input rate should be 75,100
Btu/Hr for natural gas.
VENT SYSTEM
Examine the venting system every 6 months for obstructions and/
or deterioration of vent piping.
RELIEF VALVE
At least once a year the temperature and pressure relief valve
should be checked to ensure that it is in operating condition.
(During manual operation of this valve, avoid any contact with hot
water and take preventive steps for water damage). Lift the lever at
the top of the valve several times until the valve seats properly and
operates freely.
WARNING
THEWATERPASSINGOUTOFTHEVALVEDURINGTHISCHECKING
OPERATION MAY BE EXTREMELY HOT. AVOID CONTACT AND
DISCHARGESAFELYTOPREVENTWATERDAMAGE.
Ifthetemperature andpressure reliefvalve ontheheater discharges
periodically or continuously, a problem exists. This may be due to
unusually high water temperatures or pressures in the system, or
to a faulty relief valve. Contact your dealer or a qualified service
technician to find the cause of the problem and to correct it. This
may also be due to thermal expansion in a closed water supply
system. Contact the water supplier or local plumbing inspector on
how to correct this situation. DO NOT PLUG THE TEMPERATURE
ANDPRESSURERELIEFVALVE.
WARNING
SHOULDOVERHEATINGOCCUR ORTHE GASSUPPLYFAILTO
SHUTOFF,TURNOFFTHEMANUALGASCONTROLVALVETOTHE
APPLIANCE.
HOT WATER ODOR
On occasion, hot water may develop a strong odor. If this occurs
drain the heater completely, flush thoroughly, and refill. If the
problem persists, chlorination of the heater and replacement of
the factory installed magnesium anodes with aluminum anodes
may correct the condition.
Occasionally water softener companies recommend removal of
heater anodes for odor reasons.
CAUTION
Unauthorized removal of heater anode(s) will void the warranty.
Replace the anode as necessary to maintain corrosion
protection. For further information contact your dealer.
ANODE ROD INSPECTION
The heater tank is equipped with anode rods to provide corrosion
control. At least once a year the anode rods should be checked to
determine if replacement is necessary. Initially the anode rods are
approximately 7/8" (22mm) in diameter with a 1/8" (3mm) diameter
steel core wire running down the center of the anode material.
THE ANODES SHOULD BE REPLACED when the 1/8" (3mm)
diameter core wire is visible as this means that the anode material
has been expended in the control of corrosion.
NOTE: Anode rod inspection may need to be made more
frequently in areas subject to acid rain that obtains their water
supply from surface water as the low pH will accelerate anode
activity.
CAUTION: Close cold water inlet valve serving heater and open
nearby hot water faucet to relieve the pressure in the heater
before attempting to remove anode(s) for inspection.
WINTER PROTECTION
In regions where freezing weather is encountered, all water must
be drained from unit and piping when out of service (water shut
off). Drain valve must be left open until unit is returned to service.
REPLACEMENT PARTS
Replacement parts may be ordered through Water Heater dealers,
authorized servicers or distributors. Refer to the Manufacturer's
warranty information insert for parts replacement information.
When ordering parts, be sure to state the quantity, part number
and description of the item including the complete model and
serial number as it appears on the product. Refer to the parts list
for more information.

15
PREVENTIVE MAINTENANCE
RECOMMENDED PROCEDURE FOR PERIODIC
REMOVAL OF LIME DEPOSITS FROM TANK
TYPE COMMERCIAL WATER HEATERS
The amount of calcium carbonate (lime) released from water is in
direct proportion to water temperature and usage, see chart. The
higher the water temperature or water usage, the more lime
deposits are dropped out of the water. This is the lime scale which
forms in pipes, heaters and on cooking utensils.
Lime accumulation not only reduces the life of the equipment but
also reduces efficiency of the heater and increases fuel
consumption.
The usage of water softening equipment greatly reduces the
hardness of the water. However, this equipment does not always
remove all of the hardness (lime). For this reason it is
recommended that a regular schedule for deliming be maintained.
The time between cleaning will vary from weeks to months
depending upon water conditions and usage.
UN•LIME®solvent may be obtained through your
WaterHeaterdealer ordistributor.(NOTE:UN•LIME® isnot available
in Canada).
DELIMING SOLVENTS
Water Heater manufacturer's recommend the use of UN•LIME for
deliming. UN•LIME is a patented food grade acid which is safe to
handleanddoes notcreatethe harmfulfumeswhich areassociated
with other products.
UN•LIME may be obtained from your dealer or distributor. Order
Part No. 4763 (1 gal), packed 4 gallons per case or part no. 4813
(5 gallon container).
Hydrochloric base acids are not recommended for use on glass-
lined tanks.
CAUTION
Observe handling instructions on label of product being used.
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit
to operate at its designed efficiency:
1. Once a month the heater should be flushed. Open the drain
valve and allow two gallons of water to drain from the heater.
Inlet water valve should remain open to maintain pressure in
tank.
2. A cleanout opening is provided for periodic cleaning of the
tank. Gas must be shut off and heater drained before opening
cleanout.
To clean heater through cleanout opening, proceed as follows:
1. Drain heater.
2. Remove outer cover plate from lower side of heater jacket.
3. Remove six (6) hex head screws securing tank cleanout plate
and remove plate.
4. Remove lime, scale, or sediment using care not to damage
the glass lining.
5. Inspect cleanout plate gasket, if new gasket is required, see
replacement parts list for item number.
6. Install cleanout plate. Be sure to draw plate up tight by
tightening screws securely.
7. Replace outer jacket cover plate.
FIGURE9.
In some water areas the sediment might not be removed by this
method and may result in the water heater making rumbling or
boiling noises. To dissolve and remove these more stubborn
mineral deposits, UN•LIME Professional Delimer should be used.
DELIMINGUSINGFLO-JUGMETHOD
UN•LIME in the 5 gallon size is recommended for deliming of the
***-75 and 100 models. UN•LIME with the necessary hoses and
fittings to delime your heater is also available as a kit: Up-N-Down
Transfer Kit. Contact your Water Heater dealer or distributor.

16
Prepare the Water Heater
To delime the water heater using the Flo-Jug method, first prepare
the heater for deliming. Then install the long plastic male adapter
fitting into the drain valve opening of the water heater. Use teflon
tape and hand tighten only. Do not overtighten.
Prepare the Up-N-Down Transfer Kit
The next step is the preparation on the Up-N-Down Transfer Kit, if
you have not already done so:
1. With the 5 gallon Up-N-Down container in the vertical position,
unscrew the plastic vent cap in the handle and pierce the plastic
membrane over the vent boss under the cap to allow the
container to vent.
Note: If your container does not have the vent cap and vent
boss, drill a 3/16" (4.76mm) hole in the handle. When you
have finished deliming you will be able to plug this drilled vent
with the stainless steel screw that is supplied with the kit.
2. Remove the container's cap and cut the plastic membrane
located in the 3/4" IPT opening in the cap. Take care to not
damage the threads.
3. Find the 3/4" male adapter, apply teflon tape to the threaded
end and screw it into the 3/4" IPT opening in the cap.
4. Put cap with male adapter back on the container and slide 3/4"
hose over end of male adapter and fasten in place using hose
clamp provided.
Delime using Flo-Jug Method
5. Slide the hose clamp over end of hose and slide hose over the
male adapter in the water heater drain opening and secure in
place using hose clamp.
6. Lift container to the "Pour" Position, see Figure 9, being careful
to keep the vent in the handle above the liquid level and pour
the UN•LIME into the heater.
7. Lower container, you may have to place the container on its
empty carton to prevent the UN•LIME from flowing back into the
container.
8. Let UN•LIME remain in the heater for 5 minutes and then lower
the container to the "Drain" Position, see Figure 9.
9. Deliming activity is indicated by foaming on the surface of the
UN•LIME. If there is deliming activity, repeat steps 6 thru 8.
Normally, lime removal will be completed within one hour. Severe
build-upoflime maytake longerthanan hourtocomplete descaling.
Note: To check UN•LIME for continued use, place some scale or
white chalk in a glass with a small amount of UN•LIME. If the
material is vigorously dissolved by the UN•LIME, it can be reused;
if not, the UN•LIME should be replaced.
CHECKLIST
Before contacting your dealer, check the water heater to see if the
apparent malfunction is caused by some external fault. Consulting
this checklist may eliminate the need for a repair call and restore
hot water service.
NOTENOUGHORNOHOT WATER
1. Check to see if the pilot flame is lit.
• To relight the pilot, follow the instructions on the heater or
in this manual.
• Check to see if the main gas shutoff valve in the gas supply
pipe is partially closed or the water temperature dial is set
too low.
2. Look for leakingor openhotwater faucets. Checkfor excessive
usage.
3. Your gas company can check the gas input to the heater to see
that it is correct. An underfired heater will not produce hot
water at its normal recovery rate.
4. If the heater was installed when incoming water temperatures
were warm, colder incoming temperatures will create the effect
of less hot water.
5. The thermostat water temperature adjusting dial may be set
too low.
6. If you cannot determine the cause of the problems, contact
your dealer.
WATERTEMPERATURE ISTOOHOT
1. The thermostat water temperature adjusting dial may be set
too high.
2. If lowering control setting does not reduce the water
temperature contact your dealer.
GASSMELLATTHEHEATER
1. Close the main shutoff valve in the gas supply pipe near the
heater, see fig. 4 on page 7. The thermostat includes a gas
control (top knob) which can also be closed.
2. Call your gas company.
WATERLEAKAGEISSUSPECTED
1. Check to see if the heater drain valve is tightly closed.
2. The apparent leakage might be condensation. In warm or
humid locations, condensation can accumulate and run from
within the heater or its piping.
• When a water heater is first installed and filled, the bottom
of the tank might condense water. The water accumulation,
if excessive, can drip into the floor shield. Also, during
normal operation there may be occasions when large
quantities of water are drawn, chilling the tank bottom. This
too can result in condensation.
• Condensation, appearing in the vent pipe (water dripping
from draft diverter) during heater operation is evidence of
poor vent action. Possible causes are too long a vent pipe
or improper chimney operation.
3. If the leakage is from the temperature and pressure relief valve
or its discharge pipe, it may represent a normal condition.
However, see RELIEF VALVE section on page 14. DO NOT

17
PLUGTHETEMPERATUREANDPRESSURERELIEFVALVE.
Also, the leakage could be due to unusually high water
pressures or temperatures in the system, or to a faulty relief
valve. Your dealer or a qualified service technician should be
called to determine the cause of the problem and to correct it.
4. If you cannot identify or correct the source of water leakage:
• Close the main shutoff valve in the gas supply pipe at the
heater, see Figure 4, page 7.
• Close the valve which feeds water to the cold water inlet at
the top of the heater.
• Contact your dealer.
WATERHEATERMAKESSOUNDS
1. Occasional excessive condensation, as explained under
WATER LEAKAGEIS SUSPECTED,can causea sizzlingsound
as the moisture is vaporized by the gas flame. This is a normal
sound and may be disregarded.
2. Sediment and water scale accumulations may cause rumbling
noises. See PREVENTIVE MAINTENANCE or contact your
dealer for details of flushing the heater.
3. If you cannot identify or remedy the condition, contact your
dealer.

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NOTES

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NOTES

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