State Water Heaters GPG-540A Owner's manual

1
MODELS GPG/GPV-540A, 650A AND 740A
COMMERCIAL GAS, GLASS-LINED, TANK-TYPE LOW NOx
WATER HEATER
PART NO. 195047-000
CAUTION
TEXT IN BLACK BOLD TYPE OR UNDERLINED
CONTAINS INFORMATION RELATIVE TO YOUR
SAFETY. PLEASEREADTHOROUGHLYBEFORE
INSTALLINGAND USING THISAPPLIANCE.
ASHLANDCITY,TN
www.statewaterheaters.com
PLACE THESE INSTRUCTIONS ADJACENT TO HEATER AND
NOTIFY OWNER TO KEEP FOR FUTURE REFERENCE.
• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY
PRINTEDINU.S.A.1004

2
FOREWORD
The design of the GPG 540A through 740A models complies
with ANSI Z21.10.3/CSA 4.3 as an automatic circulating tank
and an automatic instantaneous type heater. The GPV 540A
through 740A models are designed for sidewall venting and
direct venting applications and are certified under UL 795.
Detailed installation diagrams are found in this manual. These
diagrams will serve to provide the installer with a reference for
the materials and methods of piping necessary. It is highly
essential that all water, gas piping and wiring be installed as
shown on the diagrams.
Particular attention should be given to the installation of
thermometers at the locations indicated on the diagrams, as
these are necessary for checking the proper functioning of the
heater.
THEHEATERIS DESIGNEDTOOPERATEONLYONNATURAL
GAS.
THESE HEATERS MUST NOT BE INSTALLED ON
COMBUSTIBLEFLOORS.
ROUGH-INDIMENSIONS
STANDARDBAROMETRICDRAFTCONTROL
GPGMODELS HORIZONTAL&DIRECTVENTING
GPVMODELS
ALLDIMENSIONSININCHES(MILLIMETERS)
Gas Approx.
Models A B C D E F G H I Conn. Ship. Wt.
GPG/GPV 80 3/4 73 32 1/4 9 6 26 1/2 93 29 1/2 48 1/2 1* 950
540A 2,051 1,854 819 229 152 673 2,362 749 1,232 25.4 431 kg
GPG/GPV 80 3/4 73 32 1/4 9 8 26 1/2 93 29 1/2 48 1/2 1* 950
650A 2,051 1,854 819 229 203 673 2,362 749 1,232 25.4 431 kg
GPG/GPV 80 3/4 73 32 1/4 9 8 26 1/2 93 29 1/2 48 1/2 1* 950
740A 2,051 1,854 819 229 203 673 2,362 749 1,232 25.4 431 kg
*Minimum gas supply pipe is 1 1/4”, reference Table 7 for gas supply pipe size.
Storage Input Rating Recovery Rating Recovery Rating Current Draw
Capacity BTU/HR. GPH GPH 120V
Models U.S. Gals. (Litres) Nat. 100°F Rise 140°F Rise 60Hz 1 Phase
GPG/GPV-540A 85 (261) 540,000 523.6 374
GPG/GPV-650A 85 (261) 650,000 630 450
GPG/GPV-740A 85 (261) 740,000 718 512
Based on 80% thermal efficiency obtained in State engineering laboratories.
NOTE: To compensate for the effects of high altitude areas above 2000 feet, recovery ratings should be reduced approximately
4% for every 1000 feet above sea level.
6.0Amps
MAXIMUMTOTAL75 EQUIVALENT
FEET INTAKE AND EXHAUST
ALLOWED.

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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.
GPG/GPV-540A, 650A & 740A models are not available for use
with Liquefied Petroleum or LP gas. If you have obtained a
GPG/GPV-540A, 650A or 740A model with the intent to use it
withLiquefied Petroleum, LP gas - STOP! Immediately contact
your dealer to obtain a correct model.
CHEMICAL VAPOR CORROSION
WARNING
CORROSION OF THE FLUEWAYS AND VENT SYSTEM MAY
OCCUR IF AIR FOR COMBUSTION CONTAINS CERTAIN
CHEMICAL VAPORS. SUCH CORROSION MAY RESULT IN
FAILUREANDRISKOFASPHYXIATION.
Spray can propellants, cleaning solvents, refrigerator and air
conditioning refrigerants, swimming pool chemicals, calcium
GENERAL SAFETY INFORMATION
PRECAUTIONS
DONOTUSETHISAPPLIANCE IFANYPARTHASBEEN UNDER
WATER. Immediately call a qualified servicetechnicianto 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
OPERATE HEATER UNTIL ALL CORRECTIVE STEPS HAVE
BEENMADE BY A QUALIFIED SERVICEMAN.
1. EXTERNALFIRE.
2. DAMAGE.
3. FIRINGWITHOUTWATER.
4. SOOTING.
LIQUID PETROLEUM MODELS
WARNING
Water heaters for propane or liquefied petroleum gas (LPG)
TABLE OF CONTENTS
ROUGH-IN-DIMENSIONS ........................................................................2
FOREWORD ....................................................................................... 2,3
TABLEOFCONTENTS ...........................................................................3
GENERALSAFETYINFORMATION .......................................................3
Precautions ...................................................................................3
LiquidPetroleum Models ................................................................3
Chemical Vapor Corrosion ........................................................ 3,4
ImproperCombustion ....................................................................4
EXTENDEDNON-USEPERIODS .............................................................4
Cathodic Protection .......................................................................4
Insulation Blankets.........................................................................4
High Altitude Installations ..............................................................4
FEATURES .............................................................................................4
Low Emmission Control.................................................................4
High Limit Switch (E.C.O.) ......................................................... 4,5
Dishwashing Machine Requirement .............................................5
INSTALLATIONINSTRUCTIONS .............................................................5
Required Ability .............................................................................5
Uncrating .......................................................................................5
Locating the Heater ................................................................... 5,6
Hard Water ....................................................................................6
Clearances ....................................................................................6
Air Requirements...........................................................................6
Venting....................................................................................... 6,7
Vertical Venting - For GPG Models ...............................................7
Horizontal (Side-wall) Venting - For GPV Models .................... 7,8
Direct Venting - For GPV Models ............................................ 9-11
GasPiping ............................................................................. 11-12
Gas Meter Size............................................................................12
Gas Pressure Regulation ............................................................12
Gas Valves............................................................................ 12,13
Water Line Connections..............................................................13
Thermometers .............................................................................13
Relief Valve .................................................................................13
INSTALLATION DIAGRAMS ........................................................... 14-17
Manifold Kits ................................................................................18
Heater Wiring...............................................................................19
STARTUP ............................................................................................19
Important ......................................................................................19
Filling ............................................................................................19
Purging.........................................................................................19
WiringDiagram ...................................................................... 20,21
Lighting and Operating Label ......................................................22
Sequence of Operation...............................................................23
Water Temperature Control .........................................................23
Adjustment Procedure (Initial Start-Up) ................................ 23,24
Adjustment Procedure for Fire-Rate, Low Nox and
High Elevation(Fine-Tune) .................................................... 24-26
GENERALINFORMATION ....................................................................27
Power Burner..............................................................................27
Thermostat ..................................................................................27
HighLimit......................................................................................27
MAINTENANCE ....................................................................................27
General ........................................................................................27
Maintenance Schedule................................................................27
Electrical Servicing ......................................................................27
Flushing .......................................................................................27
Draining........................................................................................28
SedimentRemoval .......................................................................28
LimeScale ...................................................................................28
Relief Valve ........................................................................... 28,29
CirculatingPump ..........................................................................29
Low Emission Power Burner ......................................................29
CleaningFlues .............................................................................29
Barometric Draft Control .............................................................29
Vent System ................................................................................29
CHECKLISTANDSERVICEINFORMATION .................................... 29-30
TROUBLESHOOTING ..................................................................... 30-32
Replacement Parts ......................................................................32
WARRANTY ........................................................................................33
PARTSLIST.................................................................................... 34-39
PAGEPAGE
In addition to these instructions, the equipment shall be installed
in accordance with those installation regulations 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.
In the absence of local codes, the installation must conform with
the instructions as outlined in the latest publication of National
Fuel Gas Code (NFPA-54/ANSI Z223.1) and National Electric
Code (NFPA-70). These manuals can be purchased from the
Canadian Standards Association Laboratories, 8501 East
Pleasant Valley Road, Cleveland, OH 44131, National Fire
Protection Association, 1 Batterymarch Park, Quincy MA 02269.

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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 no 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).
IMPROPER COMBUSTION
WARNING
ATTICANDOR EXHAUSTFANSOPERATINGONTHEPREMISES
WITHAWATER HEATERCAN RESULT INCARBON MONOXIDE
POISONINGANDDEATH.
OPERATION OF THESE FANS CAN PRODUCE A NEGATIVE
DRAFT IN THEAREAOF THE WATER HEATER PREVENTING
THE PRODUCTS OF COMBUSTION FROM EXHAUSTING
THROUGHTHE CHIMNEY OR VENTPIPE.
Theventingofthe water heater should be inspected bya 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
VENTILATION AIR, ADEQUATE AIR FOR COMBUSTION AND
VENTILATION MUSTBEPROVIDEDFOR SAFE OPERATION.
EXTENDED NON-USE PERIODS
CATHODIC PROTECTION
CAUTION
HYDROGENGASCANBEPRODUCEDINAHOTWATERSYSTEM
SERVEDBYTHIS HEATER THATHAS NOT BEEN USED FORA
LONGPERIODOF TIME(GENERALLYTWOWEEKS ORMORE).
HYDROGEN GAS IS EXTREMELYFLAMMABLE. Toreducethe
risk of injury under these conditions, it is recommended that a
hot water faucet be opened for several minutes 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 to
flow. There should be not smoking or open flame near the
faucet at the time it is open.
INSULATIONBLANKETS
WARNING
INSULATIONBLANKETAVAILABLETOTHEGENERALPUBLIC
FOR EXTERNAL USE ON GAS WATER HEATERS ARE NOT
APPROVEDFOR USE ONYOUR STATE WATER HEATER. THE
PURPOSE OF AN INSULATION BLANKET IS TO REDUCE THE
STANDBYHEAT LOSSENCOUNTERED WITHSTORAGE TANK
WATER HEATER. YOUR STATE WATER HEATER MEETS OR
EXCEEDS THE ASHRAE/IES 90.1B 2001 STANDARDS WITH
RESPECT TO INSULATION AND STANDBY LOSS
REQUIREMENTS, MAKING AN INSULATION BLANKET
UNNECESSARY. THE USE OF INSULATION BLANKETS IN
CONJUNCTIONWITHASTATEWATERHEATERWILLALSOVOID
THESTATE WARRANTYFORTHEFOLLOWINGREASONS:
1. INSULATIONBLANKETS COVER IMPORTANT OPERATING
INSTRUCTIONSANDSAFETYLABELS.
2. INSULATION BLANKETS CAN RESTRICT THE AIR FLOW
NEEDEDFOR PROPEROPERATIONOF THECOMBUSTION
SYSTEM AND COULD RESULT IN FIRE, ASPHYXIATION,
SERIOUSPERSONALINJURYORDEATH.
WARNING
FAILURETOFOLLOWTHESE INSTRUCTIONSCAN RESULT IN
SERIOUSPERSONALINJURYORDEATH.
HIGH ALTITUDE INSTALLATIONS
Your Statewater heater has been designed tooperate at altitudes
below 2000 Ft. (609.6 m), for appliance installation locations
with elevations above 2000 Ft. (609.6 m), special considerations
need to be taken. Adjustments for high altitude can only be made
by a State authorized GPG/GPV Start-up Agent. To ensure your
water heater operates properly at high elevation, a State
authorized GPG/GPV Start-up Agent will readjust the air-intake
damper setting and the gas manifold pressure (if required).
NOTE: Some gas utility companies derate the heating value of
the supplied gas at high elevation. Your authorized start-up agent
must adjust for actual heating value of the gas at the time of start
up.
FEATURES
LOW EMISSION CONTROL
Your State water heater has been designed to comply with
standards established by California South Coast Air Quality
Management District (SCAQMD), the most stringent emissions
controlagencyin the nation.Toensurecompliance with SCAQMD
Rule1146.2, your heateris equipped with an internal recirculation
premix power burner, and must be started/adjusted by a
StateAuthorized GPG/GPV Start-Up Agent.
HIGH LIMIT SWITCH (E.C.O.)
The dual bulb controller also contains the high limit (energy
cutoff) sensor. The high limit switch interrupts main burner gas
flow should the water temperature reach 205°F (96°C).
In the event of high limit switch operation, the appliance cannot
be restarted unless the water temperature is reduced by 20°F
(11°C) approx. and the high limit reset button on front of limit
control is depressed, see Figure 1.
FIGURE1.

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Continued manual resetting of high limit control, preceded by
higher than usual water temperature is evidence of high limit
switch operation. The following are possible reasons for high
limit switch operation.
• A malfunction in the thermostatic controls would allow the
gasvalvetoremain open causing water temperature to exceed
the thermostat setting. The water temperature would continue
to rise until high limit switch operation.
• An improper thermostat setting for a short repetitive usage
pattern may lead to a stacking effect. This causes a
temperature gradient increasing from the bottom to the top of
the tank. It is possible that the water at the high limit switch
sensor could reach its maximum temperature before the water
temperature at the thermostat reaches the dial setting,
causing the high limit switch to activate.
• A warming of ambient conditions associated with seasonal
change could magnify the stacking process described above
to the point where high limit switch operation would occur.
Contact your dealer or servicer if continued high limit switch
operation occurs.
DISHWASHING MACHINE REQUIREMENT
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water
flow pressures between 15 and 25 pounds per square inch.
Flow pressures above 25 pounds per square inch, or below
15 pounds per square inch, will result in improperly sanitized
dishes. Where pressures are high, a water pressure reducing
or flow regulating control valve should be used in 180°F (82°C)
line to the dishwashing machine, and should be adjusted to
deliver water between these limits.
The National Sanitation Foundation also recommends
circulation of 180°F (82°C) water. Where this is done, the
circulation should be very gentle so that it does not cause any
unnecessary turbulence inside the water heater. The circulation
should be just enough to provide 180°F (82°C) water at the point
of take-off to the dishwashing machine. Adjust flow by means of
the plug cock in the circulating line.
INSTALLATION INSTRUCTIONS
REQUIRED ABILITY
INSTALLATION OR SERVICE OF THIS WATER HEATER
REQUIRES ABILITY EQUIVALENT TO THAT OF A LICENSED
TRADESMAN IN THE FIELD INVOLVED. PLUMBING, AIR
SUPPLY,VENTING,GASSUPPLYAND ELECTRICALWORKARE
REQUIRED.NOTE:AUTHORIZEDSTART-UPISREQUIRED.
UNCRATING
The heater is shipped in standard form for vertical venting with a
barometric draft control assembly in a separate carton.
Optional horizontal vent models are shipped with one (1) exhaust
vent hood and one (1) flue reducer in a separate carton. Optional
directventmodelsare shipped with two (2) vent hoodsinseparate
cartons. The exhaust vent hood carton contains one (1) exhaust
vent hood and one (1) flue reducer. The intake vent hood carton
contains one (1) intake vent hood and one (1) inlet adapter. All
parts should be installed as received without alteration.
LOCATING THE HEATER
When installing the heater, consideration must be given to proper
location. Location selected should be as close to the stack
chimney as practicable, with adequate air supply and as
centralized with the piping system as possible.
WARNING
THEREISARISKINUSING FUELBURNINGAPPLIANCESSUCH
AS GAS WATER HEATERS IN ROOMS, GARAGES OR OTHER
AREASWHERE GASOLINE,OTHER FLAMMABLELIQUIDS OR
ENGINE DRIVEN EQUIPMENT OR VEHICLES ARE STORED,
OPERATEDORREPAIRED. FLAMMABLEVAPORSAREHEAVY
ANDTRAVELALONGTHEFLOORANDMAYBEIGNITEDBYTHE
HEATER’SIGNITEROR MAINBURNERFLAMES CAUSINGFIRE
OREXPLOSION. SOMELOCALCODESPERMITOPERATIONOF
GASAPPLIANCESIFINSTALLED 18INCHESOR MOREABOVE
THEFLOOR. THISMAYREDUCETHERISKIFLOCATIONINSUCH
ANAREACANNOT BEAVOIDED.
THE HEATER SHALL BE LOCATED OR PROTECTED SO IT IS
NOTSUBJECTTOPHYSICALDAMAGEBYAMOVINGVEHICLE.
WARNING
FLAMMABLE ITEMS, PRESSURIZED CONTAINERS OR ANY
OTHERPOTENTIALFIREHAZARDOUSARTICLESMUSTNEVER
BE PLACED ON OR ADJACENT TO THE HEATER. OPEN
CONTAINERS OF FLAMMABLE MATERIAL SHOULD NOT BE
STOREDORUSED INTHESAME ROOMWITH THEHEATER.
THEHEATER MUST NOT BELOCATED INANAREAWHERE IT
WILLBESUBJECTTOFREEZING.
LOCATE ITNEARAFLOOR DRAIN. THE HEATERSHOULD BE
LOCATED INANAREAWHERE LEAKAGE FROMTHE HEATER
OR CONNECTIONS WILL NOT RESULT IN DAMAGE TO THE
ADJACENT AREA OR TO LOWER FLOORS OF THE
STRUCTURE.
WHENSUCH LOCATIONS CANNOTBEAVOIDED,ASUITABLE
DRAINPANSHOULDBEINSTALLEDUNDERTHEHEATER. Such
pans should be fabricated with sides at least 2” (50.8 mm) deep,
with length and width at least 2” (50,8 mm) greater than the
diameter of the heater and must be piped to an adequate drain.
THEPAN MUSTNOTRESTRICT COMBUSTIONAIRFLOW.
Water heater life depends upon water quality, water pressure
and the environment in which the water heater is installed. Water
heaters are sometimes installed in locations where leakage
may result in property damage, even with the use of a drain pan
piped to a drain. However, unanticipated damage can be reduced
or prevented by a leak detector or water shut-off device used in
conjunction with a piped 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 shut-off devices that activate based on the water
pressure differential between the cold water and hot water
pipes connected to the water heater.
• Devices that will turn off the gas supply to a gas water heater
while at the same time shutting off its water supply.

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Units, which are to be installed on combustible flooring, must
be supported by a full layer of hollow concrete blocks, from
8” (203.2 mm) to 12” (304.8 mm) thick and extending
12” (304.8 mm) minimum beyond the heater in all directions.
The concrete blocks must provide an unbroken concrete surface
under the heater with the hollows running continuously and
horizontally. A 3/16-inch steel plate must cover the concrete
blocks, see Figure 2.
NOTE: If electrical conduits run under the floor of the proposed
heater location, insulate the floor as recommended above.
For appliances installation locations with elevations above 2000
feet(609.6m),refertoHIGHALTITUDEINSTALLATIONS section.
PROPER INSTALLATION ON COMBUSTIBLE FLOORING
FIGURE2.
HARD WATER
Where hard water conditions exist, water softening or the
threshold type of water treatment is recommended. This will
protect the dishwasher, Coffee urns, water heaters, water piping
and other equipment.
See MAINTENANCE section for details of tank cleanout
procedure.
CLEARANCES
These heaters are designed for installation on non-combustible
flooring in an alcove with clearances to combustible construction
of 6” (152.4 mm) from the sides and rear, 24” (610 mm) from the
top with a 6” (152.4 mm) minimum between vent pipe and ceiling.
Minimum clearance from flue pipe to combustible material is
6” (152.4 mm), see Figure 3.
PROPERINSTALLATION CLEARANCES
FIGURE3.
A clearance of 30” (762 mm) shall be maintained from
serviceable parts, such as power burners, relief valves flue
baffles, thermostats or drain valves.
AIR REQUIREMENTS
KEEPAPPLIANCEAREACLEAR ANDFREEOFCOMBUSTIBLE
MATERIALS,GASOLINEANDOTHERFLAMMABLEVAPORSAND
LIQUIDS.
DO NOT OBSTRUCT THE FLOW OF COMBUSTION OR
VENTILATINGAIR.
WARNING
FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR
COMBUSTIONANDVENTILATION. AN INSUFFICIENT SUPPLY
OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION
PRODUCTSRESULTINGINAIRCONTAMINATIONTHATMAYBE
HAZARDOUSTOLIFE. SUCHACONDITIONOFTENWILLRESULT
IN A YELLOW, LUMINOUS BURNER FLAME, CAUSING
CARBONINGOR SOOTING OFTHE COMBUSTION CHAMBER,
BURNERS AND FLUE TUBES AND CREATES A RISK OF
ASPHYXIATION.
Where an exhaust fan is installed in the same room with a heater,
sufficient openings for air must be provided in the walls.
UNDERSIZEDOPENINGSWILLCAUSEAIRTOBE DRAWNINTO
THE ROOM THROUGH THE CHIMNEY, CAUSING POOR
COMBUSTION. SOOTINGMAYRESULTIN SERIOUS DAMAGE
TOTHEHEATERANDRISK OFFIREOREXPLOSION.
UNCONFINEDSPACE
In buildings of conventional frame, brick or stone construction,
unconfined spaces may provide adequate air for combustion
and ventilation.
If the unconfined space is within a building of tight construction,
(building using the following construction: weather stripping,
heavy insulation, caulking, vapor barrier, etc.), air for combustion
and ventilation must be obtained from outdoors or spaces freely
communicating with the 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
ORWITHIN 12 INCHES (304.8 mm) OF THE ENCLOSURE TOP
AND ONE IN OR WITHIN 12 INCHES (304.8 mm) OF THE
ENCLOSURE BOTTOM. Each opening shall have a free area of
at least one square inch per 1000 Btuh of the total input of all
appliances in the enclosure, but not less than 100 square inches.
If the confined space is within a building of tight construction, air
for combustion and ventilation must be obtained from outdoors.
When directly communication 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 of the total input of all
appliances in the enclosure.
VENTING
THEINSTRUCTIONS IN THIS SECTION ON VENTINGMUSTBE
FOLLOWED TO AVOID CHOKED COMBUSTION OR
RECIRCULATIONOFFLUE GASES. SUCHCONDITIONSCAUSE
SOOTINGORRISKSOF FIREANDASPHYXIATION.

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Heater must be protected from freezing downdrafts during
shutdown periods.
The GPG 540A, 650A and 750A water heater are classified as a
category I appliance (non-positive vent pressure, non-
condensing) when installed with the supplied barometric draft
control assembly in a vertical vent installation.
The GPV 540A through 740A heater is classified as a category
III appliance (positive vent pressure, non-condensing) when
installed with supplied sidewall vent kits or direct vent kit.
All regulations pertaining to the venting of these heaters must
be followed.
The following vent installation instructions cover vertical,
horizontal, and direct vent applications.
VERTICAL VENTING - FOR GPG MODELS
BAROMETRICDRAFTCONTROLASSEMBLY
A double-acting barometric draft control assembly is provided
with any unit intended for chimney venting. The purpose of this
draft control is twofold. During downdrafts it acts as a pressure
reliefcontroltoprevent the downdraftfromblowingintothe heater.
It also allows for makeup air to enter the chimney without being
drawn through the heater. In both cases the control prevents the
heater performance from being adversely affected by conditions
within the chimney.
The draft control assembly must be installed without alteration.
This assembly is factory adjusted for horizontal application only
and must be attached to the heater as shown in Figure 4. The
direction in which the outlet to the draft controls assembly faces
is arbitrary. The assembly must be fitted to the jacket cover such
that it is plumb and level to the ground. Fasten the draft control
assembly to the top cover using sheet metal screws at three
locations, or more, as required.
Damper or other obstructions must not be installed between the
heater and the barometric draft control assembly.
Do not adjust settings on gate.
When installed, the damper gate must pivot freely in the ring
guides. This gate will automatically adjust to regulate the
chimney draft imposed on the heater.
VENTCONNECTIONS
Vent connections must be madeto an adequate stackor chimney.
Refer to the National Fuel Gas Code or to the vent pipe
manufacturer’s gas vent and chimney sizing table to properly
design and size the venting system. Refer to Table 1 for the vent
pipe size required for installation to the barometric draft control
assembly outlet.
TABLE1.
Model FlueOutlet
GPG-540A 9” (228.6 mm)
GPG-650A 9” (228.6 mm)
GPG-740A 9” (228.6 mm)
Single-wall or type B venting may be used with these heaters in
vertical vent installations. All local and utility regulations on
venting must be followed.
NOTE:ANEGATIVEDRAFTMUSTBEMAINTAINEDINVENTING.
A negative draft of 0.02” to 0.04” w.c. Must be maintained in
venting system. Measure draft at the location illustrated in
Figure 4. Adjust the control counter-weights if necessary as
shown in the MAINTENANCE portion of this manual.
Where an existing chimney or vent is to be used, be sure that the
chimney or vent has adequate capacity for the number and sizes
of gas appliances being vented through it. Inspect the chimney
or vent and remove all soot or other obstructions, which will
retard free draft.
Vent connectors making horizontal runs must have a minimum
upward slope toward the chimney or vent of ¼ inch per foot. Vent
connector length should be kept as short as possible. Be sure
that the vent pipe does not extend beyond the inside wall of a
chimney, see Figure 4.
FIGURE4.
In venting systems where a continuous or intermittent back
(positive) draft is found to exist, the cause must be determined
and corrected. In some cases, a special vent cap may be
required.
WARNING
Failure to correct back drafts may cause air contamination
and unsafe conditions.
Do not connect the heater to a common vent or chimney with
solid fuel burning equipment. This practice is prohibited by
many local building codes as is the practice of venting gas fired
equipment to the ductwork of ventilation systems.
Connectors shall not be connected to a chimney, vent or venting
system served by a power exhauster, unless the connection is
made on the negative pressure side of the exhauster.
Do not connect any heater vented by natural draft to any vent
serving mechanical draft equipment operating under positive
vent pressure such as category III or category IV appliances.
HORIZONTAL (SIDE-WALL) VENTING -
FOR GPV MODELS
An exhaust vent hood, vent hood and a flue reducer are supplied
with any unit intended for through-the-wall horizontal venting.
These parts must be installed without alteration. The vent hood
adapter is designed for use with Selkirk Metalbestos Model PS
or Model G venting, see Figure 7 on page 10.

8
Refer to Table 2 for limitations of venting system design for
horizontal venting. TABLE2
GPV-540A-740A
FlueOutlet Dia. (Inches/mm) 9” (228.6)
Flue Reducer 9” x 8”
Dimensions -Supplied (Inches/mm) 228.6 x 203.2
MinimumOutlet VentDia.(Inches/mm) 8” (203.2)
MaximumNumber 90° 4
Of Elbows 45° 8
Maximum Total Vent System 75
Length, Equiv. Feet/Meters (23 m)
When calculating the equivalent length of a venting system each
90° elbow is equivalent to 10 feet (3 m) of straight pipe. In no
case 45° elbow is equivalent to 5 feet (1.5 m) of straight pipe. In
no case may the sum of the straight pipe lengths and the
equivalent length of the elbows exceeds 80 feet (24.3 m).
Note the minimum vent diameter in Table 2.
Refer to Table 3 for the correct vent terminal size for each heater.
The dimensions noted in Table 3 refer to Figure 5.
TABLE3
Heater Terminal Rough-In
Model Model A B C D Dimensions
GPV
540A- VH-1-8” 19-7/8” 13” 10-9/16” 8-5/8” 11-1/16”
740A
FIGURE5
Use only the sidewall vent terminal supplied with the heater.
These terminals are specifically listed for use on these
State heaters.
VENTTERMINALLOCATIONS-EXHAUST
When considering location for sidewall vent terminals refer to
the latest edition of the National Fuel Gas Code which
recommends that vent terminals:
1. Shall be located not less than 12” (304.8 mm) above grade.
2. Shall be located not less than 7 feet (2.1 m) above grade
when adjacent to a public walkway.
3. Shall terminate at least 3 feet (0.9 m) above any forced air
inlet within 10 feet (3 m).
4. Shall terminate at least 4 feet (1.2 m) below, 4 feet (1.2 m)
horizontally from or 1 foot above any door, window or gravity
air inlet into any building.
5. Shall not be closer than 3 feet (0.9 m) from the inside corner
of an L- shaped structure.
6. Shall be located above the snow line in geographical areas
where snow accumulates.
VENTSYSTEMINSTALLATION
This heater is a category III appliance when horizontally vented
through a wall using the supplied sidewall vent terminal. All
national and local codes pertaining to the installation of such
venting systems must be followed.
Horizontal portions of the vent system must be installed with a
minimum upward slope of 1/4” per foot of length.
All joints and seams in the venting system must be sealed gas
tight. If a silicone sealer is used, it must have a continuous
temperature rating of at least 500°F (260°C); Dow Corning
736 or equivalent must be used.
CAUTION
Use only the vent hood supplied with this kit. Only supplied
hood provides required clearances from combustibles, both
through the wall and the exterior siding. Termination of a
sidewall vent system with a device other than the supplied
vent hood could affect system performance and result in a
safety hazard.
IMPORTANT
Plan the layout of the vent system backward from the vent
termination to the water heater.
1. Use the layout of the vent system backward from the vent
termination to the water heater.
BEWARE OF CONCEALED WIRINGAND PIPING INSIDE OF
WALL. REFER TO TABLE 5 FOR THE MAXIMUM WALL
THICKNESS“B”FOREACHMODEL.
2. Slide hood through opening from outside. Fasten hood to
exterior wall with anchors and screws supplied.
3. Install covers plate and fasten to inside wall with 4 screws.
4. Attach a seal ring (Meltalbestos SR or equivalent) to the vent
hood collar, see Figure 7. Attach Selkirk Metalbestos model
PS or model G venting to the seal ring following the venting
manufacturer’s instructions. For total safety, it is
recommended that only venting listed for use with category III
appliances (positive vent pressure, non-condensing) should
be used between the heater and the vent hood, even through
national or local codes may allow the use of type B or single-
wall vent.
5. Installthe remaining vent sections backto the heater,following
the venting manufacturer’s instructions on assembling and
sealing joints. Follow good venting practice regarding
properly supporting vent system and keeping the number of
offsets to a minimum. See Table 2 for the maximum allowable
number of elbows in venting system.
6. Installthefluereducer included with the exhaust hoodbetween
the vent system and the heater.
7. Seal all vent connections and venting with sealants supplied
by vent pipe manufacturer or with a high-temperature silicone
sealant suitable for continuous temperatures of 500°F
(260°C). Acceptable sealant include Dow Corning 736
or equivalent.

9
DIRECT VENTING - FOR GPV MODELS
All exhaust vent terminal, flue reducer, and intake vent terminal
are supplied with any unit intended for direct venting. These
parts must be installed without alteration.
This heater is category III appliance when used in a direct vent
application. All national and local codes pertaining to the
installation of such an appliance must be followed.
Horizontal portions of the exhaust vent system must be installed
with a minimum upward slope of 1/4” (6.35 mm) per foot of
length.
Selkirk metalbestos model PS or G vent is approved for use as
exhaust venting on these models. Model PS is a double-wall
vent with a 1” (25.4 mm) air space between pipes. Model G is a
single-wall variation of model PS for use where combustible
clearance is not a concern, see Table 4.
TABLE4.
Selkirk Metalbestos Model PS
Clearance to Combustibles
Interior 6” (152.4 mm)
Exterior 6” (152.4 mm)
8” diameter PVC or galvanized pipe is approved for use as
intake venting on these models. Class 63, 100, 125, 200, and
schedule 40 pipe may be used for PVC pipe. Intake venting
must be adequately supported to avoid unnecessary stress on
vent hood, venting, or burner.
See Table 5 limitations on venting system design for direct vent
installations.
TABLE5.
Dimension in GPV
Inches (mm) 540A -740A
Flue Outlet Dia. 9 (229)
Flue Reducer Dimension 9 x 8
(Supplied) (229 x 203)
Min. Exhaust Vent Dia. Inch (mm) 8 (203)
Min. Intake Vent Dia. Inch (mm) 8 (203)
Maximum Number Of 90° 4
Elbows, Intake 45° 8
Maximum Number Of 90° 4
Elbows, Exhaust 45° 8
Total Intake Vent Max. 75 (23 m)
Length, Equiv. Ft. Min. 3 (1 m)
Total Exhaust Vent Max. 75 (23 m)
Length, Equiv. Ft. Min. 6 (1.8)
Note:Barometric draft control is not used in direct vent installations
as the venting system must be sealed.
When calculating the equivalent length of a venting system each
90 elbow is equivalent to 10 feet of straight pipe. Each 45 elbow
is equivalent to 5 feet (1.5 m) of straight pipe. Do not exceed the
maximum number of elbows as shown in Table 5. In no case may
the sum of the straight pipe lengths and the equivalent lengths of
the elbows exceed the valves in Table 5.
VENTTERMINALLOCATIONS-EXHAUST
See “Horizontal Venting” in this manual for acceptable locations
for exhaust hoods.
VENTTERMINALLOCATIONS-INTAKE
When considering locations for the intake terminal, bear in mind
that the terminal:
FIGURE6.

10
1. Shall be located not less than 12” (304.8 mm) above grade.
2. Shall be located not less than 3 (.9144 m) feet horizontally
from and not less than 3 feet (.9144 m) below an exhaust vent
terminal.
3. Shall not be located directly above an exhaust terminal.
4. Shall be located 12” (304.8 mm) above the snow line in
geographical areas where snow accumulates.
5. Shall be located not less than 7 feet 2.1 m) above grade
when adjacent to a public walkway.
6. Shall not be closer than 3 feet (.9144 m) from the inside
corner of an L - shaped structure.
7. Shall be located not less than 3 feet (.9144 m) horizontally or
3 feet (.9144 m) vertically from gas line, meter, or other gas
supply entering a structure, see Figure 6.
FIGURE7.
DIRECTVENTSYSTEMINSTALLATION
Plan the vent system backwards from the vent hood to the heater.
1. Use the inside wall cover plate as a template to mark two
holes in the appropriate places on the wall. Cut holes
1/2” (12.7 mm) larger to facilitate easy installation of vent
hoods, see Figures 6 and 7.
BEWAREOFCONCEALEDWIRINGANDPIPINGINSIDEWALL.
REFER TO TABLE 3 FOR THEMAXIMUM WALL THICKNESS
“B”FOREACHMODEL.
2. Slide hoods through openings from outside. Fasten hoods
to exterior wall with anchors and screws supplied.
3. Install cover plate and fasten to inside wall with 4 screws
4. Attachasealring(Selkirk Metalbestos Model SR or equivalent)
to the vent hood collar, see Figure 7.
FIGURE7B.

11
5. Attach a properly sized length of Selkirk Metalbestos model
PS or model G venting to the exhaust vent adapter using the
inner vee bands, see Figures 7 and 7B on page 10.
6. Fill the grooves in both inner vee bands with high-temp
silicone sealant, Dow Corning 736 or equivalent.
7. Position the inner vee bands around the inner pipe flanges
and tighten the screws securing the bands.
8. Align the outer channel band with the outer pipe grooves
and tighten the screws securing the bands.
9. Repeat steps 6-8 for each successive pipe length until the
venting reaches the heater.
10. Follow the manufacturer’s instructions for proper support
and guide spacing for horizontal runs of pipe, see Table 6.
TABLE6.
Vent Diameter S F
8” - GPV -540A, 650A & 740A 15’ 3” 7’ 6”
S = Maximum spacing between two guides or a support
and a guide in either a vertical or horizontal direction.
F = Maximum height above a guide or support for free
standing system above a roof or parapet wall.
11. Use an expansion joint between any two fixed points in the
exhaustventingsystem wherever the expansion may exceed
1/4”. Selkirk Metalbestos model PS and model G venting
will expand by one inch per 100°F in gas temperature per
100 feet of vent length. The expansion can be calculated by
the following formula:
Expansion, Vent length between 5
Inches two fixed points, feet 100
Ifthe expansion calculated isgreater than 1/4”, an expansion
joint must be used between the two fixed points.
12. Attach the flue reducer included in the exhaust vent hood
package to the flue collar on the heater.
13. Attach the flue reducer to the vent system using a seal ring.
Attach this ring to the venting using the inner vee bands as
outlined in Steps 5-7.
14. Attach 8” air-intake connector to intake vent hood collar. It
may be necessary to use a slip-slip coupling to fit the pipe
to the intake vent hood.
15. Attach 8” air-intake connector back to the 6” burner air inlet
with 8” x 6” reducer. Prime and cement each joint to assure
gas-tight construction.
16. Seal all joints at the vent hoods with silicone sealant. Also
seal the joints at the flue collar and air inlet adapter. Joint on
the exhaust side must be sealed with high-temp silicone
sealant, Dow Corning 736 or equivalent.
WARNING
PRIMERSANDCEMENTSAREEXTREMELYFLAMMABLE,AND
MUSTNOTBESTOREDORUSEDNEARHEATOROPENFLAME.
ALLOWADEQUATECURINGTIMEBEFOREOPERATINGHEATER.
DRAINVALVEANDACCESS PANELS
The heaters are equipped with a 3/4” NPT drain valves mounted
above and to the left of the burner.
An access panel is located above and to the right of the burner,
see Figure 8. This panel covers the cleanout opening in the tank
which is sealed by a gasket and cover. Another cleanout access
panel is located towards the back of the heater.
FIGURE8.
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.
Size the main gas line in accordance with Table 9 and 9A.
Minimum required gas supply pipe size is 1 1/4”. 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 that fittings such as elbows and tees will add to the pipe
pressure drop.
TABLE9
MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR
(Based upon a Pressure Drop of 0.5 inch Water Column
and 0.5 Specific Gravity Gas and max. gas press. of .5 psig)
LENGTH
IN Nominal Iron Pipe Sizes, Inches
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
20 120 250 485 950 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
= x

12
TABLE9A
MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR
(Based upon a Pressure Drop of 0.5 inch Water Column
and 0.5 Specific Gravity Gas and max. gas press. of .5 psig)
LENGTH
IN Nominal Iron Pipe Sizes, Millimeters
METERS 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
3.0 51 105 199 410 615 1160 1845 3221 6735
6.1 35 73 142 278 428 805 1277 2255 4626
9.1 28 59 110 225 346 644 1031 1830 3748
12.2 24 50 94 193 290 556 878 1552 3192
15.2 21 44 83 170 264 492 776 1391 2840
18.3 19 40 76 155 237 445 703 1259 2577
21.3 18 37 70 143 220 410 659 1142 2372
24.4 17 35 64 135 202 381 600 1083 2196
27.4 16 32 60 126 190 357 571 1010 2108
30.5 15 30 57 117 182 337 542 952 1962
38.1 13 27 51 105 161 299 483 864 1757
45.7 12 25 47 95 146 278 439 776 1610
53.3 11 23 42 88 135 249 401 717 1464
61.0 10 21 40 82 126 234 375 688 1347
WARNING
THEHEATER IS NOT INTENDEDFOR OPERATIONAT HIGHER
THAN14”(3.5 kPa)WATER COLUMN(1/2 POUNDPERSQUARE
INCH) SUPPLY GAS PRESSURE. HIGHER GAS PRESSURES
REQUIRESUPPLEMENTALREDUCINGSERVICE REGULATION.
EXPOSURETO HIGHERGAS SUPPLYPRESSUREMAY CAUSE
DAMAGETO THEGAS CONTROLS WHICHCOULD RESULT IN
FIRE OR EXPLOSION. IF OVERPRESSURE HAS OCCURRED
SUCH AS THROUGH IMPROPER TESTING OF GAS LINES OR
EMERGENCYMALFUNCTIONOFTHESUPPLYSYSTEM,THEGAS
VALVEMUSTBECHECKEDFORSAFEOPERATION. MAKESURE
THATTHEOUTSIDEVENTSONTHESUPPLYREGULATORSAND
THE SAFETY VENT VALVES ARE PROTECTED AGAINST
BLOCKAGE. THESEAREPARTSOFTHEGASSUPPLYSYSTEM,
NOTTHEHEATER. VENTBLOCKAGE MAYOCCUR DURINGICE
STORMS.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING
FROMCONTAMINANTSINTHEGASWAYS. SUCHFOULINGMAY
CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE
INTERNALLYTINNEDANDCERTIFIEDFORGASSERVICE.
BEFOREATTACHINGTHEGAS LINE, BE SURE THATALLGAS
PIPE IS CLEAN ON THE INSIDE.
TOTRAPANYDIRTORFOREIGNMATERIALINTHEGASSUPPLY
LINE,ADIRTLEG(SOMETIMESCALLED ASEDIMENTTRAPOR
DRIPLEG) MUSTBE INCORPORATED INTHE PIPING(SEE FIG.
10)THEDIRT LEG MUST BE READILYACCESSIBLEAND NOT
SUBJECT TO FREEZING CONDITIONS. INSTALL IN
ACCORDANCEWITH RECOMMENDATIONSOFSERVINGGAS
SUPPLIERS. REFER TO THE NATIONAL FUELGAS CODE.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the
male threads of pipe joints. Do not apply compound to the first
two threads. Use compounds resistant to the action of liquefied
petroleum gases.
DISCONNECTTHE APPLIANCE ANDITS MANUAL GAS SHUT-
OFFVALVE FROMTHE GASSUPPLYPIPINGSYSTEM DURING
ANY SUPPLY PRESSURE TESTING EXCEEDING
1/2 PSIG. GAS SUPPLY LINE MUST BE CAPPED WHEN
DISCONNECTED FROM THE HEATER. FOR TEST
PRESSURES OF ½ PSIG OR LESS, THE APPLIANCE NEED
NOT BE DISCONNECTED, BUT MUST BE ISOLATED FROM
THE SUPPLY PRESSURE TEST BY CLOSING THE MANUAL
GASSHUT-OFF VALVE.
GAS PIPING AND DIRT LEG INSTALLATION
FIGURE9.
BEFOREPLACINGTHEHEATERINOPERATION,CHECKFORGAS
LEAKAGE. USE SOAP AND WATER SOLUTION OR OTHER
MATERIAL ACCEPTABLE FOR THE PURPOSE IN LOCATING
GASLEAKS. DO NOT USE MATCHES, CANDLES, FLAME OR
OTHERSOURCESOFIGNITIONFOR THISPURPOSE.
GAS METER SIZE – CITY GASES ONLY
Be sure that the gas meter has sufficient capacity to supply the
fullrated gas input of thewater heater as wellas the requirements
of all other gas fired equipment supplied by the meter. If the gas
meter is too small, request the gas company to install a larger
meter having adequate capacity.
GAS PRESSURE REGULATION
Main line gas pressure to the water heater should be between
8” w.c. (2 kPa) minimum (dynamic pressure or net pressure)
and 14” (3.5 kPa) maximum w.c. (static pressure). The inlet gas
pressure must not exceed the maximum value. A service
regulator is necessary if higher gas pressures are encountered,
see Table 10.
Due to pressure drop along gas supply line, to maintain
8” w.c. (2 kPa) minimum dynamic pressure, initial gas inlet
pressure must be set at higher than 8” w.c. (2 kPa). The gas
regulator must be properly sized to prevent unstable control or
excessive pressure drop.
GASVALVES
Figure 10 shows the gas control valve that is supplied on these
heaters.

13
ROBERTSHAW®7000 DERHC GAS CONTROL VALVE
FIGURE10.
WATER LINE CONNECTIONS
Following are detailed installation diagrams for typical methods
of application for the water heaters.
The water heater may be installed by itself, or with a separate
storage tank, on both single and two-temperature systems.
When used with a separate storage tank, the circulation may be
either by gravity or by means of a circulating pump. When a
circulating pump is used it is important to note that the flow rate
should be slow so that there will be a minimum of turbulence
inside the heater.
If a water heater is installed in a closed water system, contact
the water supplier or local plumbing inspector on how to control
this situation.
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 causing premature tank failure
orintermittent relief valve operation. This isnot 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 water under supply
pressure.
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.
THERMOMETERS (Not supplied)
Thermometers should be obtained and field installed as shown
in the installation diagrams.
Thermometers are installed in the system as a means of
detecting the temperature of the outlet water supply.
RELIEF VALVE
This heater is equipped with an approved temperature and
pressure relief valve. ASME ratings cover pressure relief.
A.G.A ratings cover release rate with temperature actuation.
FORSAFE OPERATIONOFTHE WATERHEATER, THE RELIEF
VALVE(S) MUSTNOTBE REMOVEDORPLUGGED.
In addition to the appliance relief valve, each remote storage
tank that may be used in conjunction with this appliance shall
also be installed with a properly sized, rated and approved
temperature (ANSI) and pressure (ASME) relief valve(s). This
relief valve shall comply with the standard for relief valves and
automatic gas shut-off devices for hot water supply systems,
ANSIZ21.22/CSA 4.4.
Your local code authority may have other specific relief valve
requirements.
WARNING
THE PURPOSE OF ARELIEF VALVE IS TOAVOID EXCESSIVE
PRESSUREORTEMPERATUREINTOTHESTEAMRANGE,WHICH
MAYCAUSESCALDINGAT FIXTURES,TANK EXPLOSION,AND
SYSTEMOR HEATERDAMAGE. NO VALVEIS TO BEPLACED
BETWEENTHERELIEFVALVEANDTHETANK.
ADRAINLINEMUSTBECONNECTEDTOTHERELIEFVALVETO
DIRECTDISCHARGETOASAFELOCATIONTOAVOIDSCALDING
ORWATERDAMAGE. THISLINEMUSTNOTBEREDUCEDFROM
THE SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN
VALVES, RESTRICTIONS NOR SHOULD IT BE LOCATED IN
FREEZINGAREAS. DONOTTHREADORCAPTHEENDOFTHIS
LINE. RESTRICTEDOR BLOCKEDDISCHARGE WILL DEFECT
THE PURPOSE OF THE VALVE AND IS UNSAFE. DISCHARGE
LINESHALLBEINSTALLEDTOALLOWCOMPLETEDRAINAGE
OFBOTHTHEVALVEANDLINE.
® Robertshaw is a registered trademark of the Robertshaw Controls
Company Corporation.

14
INSTALLATION DIAGRAMS
ONETEMPERATURE - ONEHEATER VERTICALSTORAGETANK
FORCEDCIRCULATION WITHOR WITHOUTBUILDING RECIRCULATION
DANGER
IF BUILDING COLD WATER SUPPLY HAS A
BACKFLOW PREVENTER, CHECK VALVE OR
WATER METER WITH CHECK VALVE,
PROVISIONS FOR THERMAL EXPANSION OF
WATER IN THE HOT WATER SYSTEM MUST BE
PROVIDED.
NOTE: CONNECT RETURN LINE FROM HOT
WATER RECIRCULATING LOOP (IF USED) TO
COLD WATER INLET LINE.
ONETEMPERATURE - ONEHEATER HORIZONTALSTORAGETANK
FORCEDCIRCULATION WITHOR WITHOUTBUILDING RECIRCULATION
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE
TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 23. IF HIGHER PREHEAT
TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT
WATER SUPPLIED TO FIXTURES.
*PIPETOOPENDRAIN INSTALLINACCORDANCEWITHLOCALCODES
NOTE:
WHEN USING A State T-140, 200, 350 OR 400
STORAGE TANK, USE LOWER 3/4” OPENING FOR TANK TEMP. CONTROL
CIRCULATINGPUMPWIRINGDIAGRAM

15
TWOTEMPERATURE - ONEHEATER HIGH TEMPERATURE
WITHOR WITHOUT BUILDING RECIRCULATION
TWOTEMPERATURE - TWO HEATERS HIGHTEMPERATURE
WITHOR WITHOUT BUILDING RECIRCULATION
*PIPE RELIEF VALVE TO OPEN DRAIN
NOTE: IF TEMPERED WATER IS
RECIRCULATED, RETURN LINE
SHOULD BE CONNECTED AT
POINT “A”.
INSTALL IN ACCORDANCE WITH LOCAL
CODES
CAUTION: IF BUILDING COLD WATER
SUPPLY HAS A BACKFLOW PREVENTER,
CHECK VALVE OR WATER METER WITH
CHECK VALVE, PROVISIONS FOR
THERMAL EXPANSION OF WATER IN THE
HOT WATER SYSTEM MUST BE
PROVIDED.
WIRING DIAGRAM FOR TEMPERED WATER LOOP (IF USED)
CIRCULATINGPUMPWIRINGDIAGRAM
DANGER
TEMPERATURE SETTING SHOULD NOT
EXCEED SAFE TEMPERATURE AT
FIXTURES. SEE WATER TEMPERATURE
CONTROL WARNING ON PAGE 23. IF
HIGHER PREHEAT TEMPERATURES ARE
NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD AN ANTI-SCALD
VALVE FOR HOT WATER SUPPLIED TO
FIXTURES.

16
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A
BACKFLOW PREVENTER, CHECK VALVE OR WATER
METER WITH CHECK VALVE, PROVISIONS FOR
THERMAL EXPANSION OF WATER IN THE HOT WATER
SYSTEM MUST BE PROVIDED.
TWOTEMPERATURE - THREEHEATERS (TWO PRE-HEATERS/ONEBOOSTER)
WITHOR WITHOUT BUILDING RECIRCULATION
TWOTEMPERATURE - TWOHEATERS (ONE PRE-HEATER/ONEBOOSTER HEATER)
WITHOR WITHOUT BUILDING RECIRCULATION
FOR MULTIPLE HEATER INSTALLATION SEE
MANIFOLD KIT SPECIFICATIONS, PAGE 18.
* PIPERELIEFVALVETOOPENDRAIN.
** 140°F TO 150°F SHOULD BE MAXIMUM
WATERTEMPERATUREMAINTAINEDINTHE
PRE-HEATERS.
120°F SHOULD BE THE MINIMUM
TEMPERATURE OF WATER INTHEPRE-
HEATERS.
CONNECTCIRCULATINGLINE FROM FIXTURES, IF
USED, TO COLD WATER SUPPLY LINE OF PRE-
HEATER.
CONNECTCIRCULATINGLINEOF180°FORBOOSTED
WATER,IFUSED,TOINLETWATERLINETOBOOSTER.
INSTALLINACCORDANCEWITHLOCALCODES.
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT
FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 23. IF
HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE
BOOSTER OUTPUT, ADD ANANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO
FIXTURES.
CIRCULATINGPUMPWIRINGDIAGRAM

17
TWOTEMPERATURE - ONEHEATER HIGH TEMPERATURE
WITH RECIRCULATION OF SANITIZING LOOP
CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACKFLOW
PREVENTER, CHECK VALVE OR WATER METER WITH CHECK VALVE,
PROVISIONS FOR THERMAL EXPANSION OF WATER IN THE HOT
WATER SYSTEM MUST BE PROVIDED.
DANGER
TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE
AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON
PAGE 23. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO
OBTAIN ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE
FOR HOT WATER SUPPLIED TO FIXTURES.
*PIPE TO OPEN DRAIN
INSTALL IN ACCORDANCE WITH LOCAL CODES
NOTE1: TOGGLESWITCH CONTROLS 180° WATERCIRCULATION.
INSTALL ON OR CLOSE TO DISHWASHING MACHINE.
TOGGLESWITCHMUSTBECLOSED(ON)DURINGTHERINSE
OPERATIONANDOPEN(OFF)WHENDISHWASHERISNOT
OPERATING OR WHEN ONLONGSTANDBY.
NOTE2: INSTALLLINETEMPERATURECONTROLINANUNINSULATED
TEEBEYONDTHEDISHWASHINGMACHINETAKEOFFINTHE
SANITIZINGLOOP. CONTROLSHOULDBESETAT185°F.
NOTE3: ADJUSTPLUGCOCKSOTHESANITIZINGLOOPFLOWRATE
DOESNOT CAUSE UNNECESSARYTURBULENCE IN THE
TANK.
NOTE4: IF TEMPERED WATER IS RECIRCULATED, RETURN LINE
SHOULDBECONNECTEDATPOINT“’A”.

18
MANIFOLD KITS
Precision cut type “L” all copper State manifold kits assure water
flow balance of all units. Without this balance, the full water
heating and storage potential of the system cannot be achieved.
Plus, the units with the higher water flow may have a shortened
life. Unions shown in piping diagrams are not included in the
manifold kits.
Dimensions shown are for minimum space occupied by the
water heaters assemblies.
Space for the barometric draft control assemblies, combustion
clearances and servicing must be added.
WARNING
FAILURE TO PROPERLY MANIFOLD MULTIPLE WATER
HEATERSAND PROVIDEADEQUATE STORAGE CAPACITYIN
ACCORDANCEWITHPROPERSIZINGTECHNIQUESCANRESULT
INIMPROPEROPERATIONANDPOSSIBLEFIRERESULTING IN
PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
HEATERS SHOULD BE MANIFOLDED IN PARALLEL FOR
UNIFORMHYDRONIC LOADINGPER THE DIAGRAMSSHOWN
IN THISMANUAL.
TWO UNIT MANIFOLD KIT
PART NO. 195702
THREE UNIT MANIFOLD KIT
PART NO. 195703
FOUR UNIT MANIFOLD KIT
PART NO. 195704

19
HEATER WIRING
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE
APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED
WITH 105°C WIRE OR ITS EQUIVALENT, EXCEPT IN THE
BURNER HOUSING USE 200°C WIRE.
The power burner is wired to the heater as shown in Figure 11
for GPG models and Figure 12 for GPV models. The model
and rating plate provided the electrical information needed
to size the complete heater branch supply.
All electrical work must be installed in accordance with the
National Electrical Code and local requirements.
When installed, the appliance must be electrically grounded in
accordance with local codes or, in the absence of local codes,
with the National Electrical Code, ANSI/NFPA 70-1987.
DONOTENERGIZETHEBRANCHCIRCUITBEFORETHEHEATER
TANKIS FILLEDWITHWATER.
START UP
IMPORTANT
AUTHORIZED START-UP REQUIRED. Start-up by a State
Authorized GPG/GPV Start-Up Agent is required on the model
covered by this manual. Start-up and Operation of this unit by
other than an Authorized GPG/GPV Start-Up Agent will void the
warranty.
If you have not already done so, contact your local State Sales
Representative or Authorized GPG/GPV Start-Up Agent and
set-up a date for the start-up service.
The time to ask any questions you may have about your unit is
when the State Authorized GPG/GPV Start-Up Agent is there.
Please do not hesitate to ask the agent any questions which you
may have regarding the units start-up, operation or maintenance.
CAUTION
BEFORE PROCEEDING WITH THE OPERATION OF THE UNIT,
MAKESURE HEATERAND SYSTEMAREFILLEDWITH WATER
ANDALLAIR ISEXPELLEDFROM HEATERAND PIPING.
NEVER OPERATE THE HEATER WITHOUT FIRST BEING
CERTAIN IT IS FILLED WITH WATER AND A TEMPERATURE
ANDPRESSURERELIEFVALVE IS INSTALLEDINTHE RELIEF
VALVEOPENING OFTHEHEATER.
FILLING
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.
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 OR FIRE OR
EXPLOSION,PURGEDISCHARGEMUSTNOTENTERCONFINED
AREAORSPACESWHERE IGNITIONCANOCCUR. THEAREA
MUSTBEWELL VENTILATEDANDALLSOURCESOFIGNITION
MUSTBEINACTIVATEDORREMOVED.
The following test equipment should be on hand: (all test
equipment must be acclimated to ambient temperature before
calibration and use.)
–CO
2indicator (Fyrite or similar) or O2analyzer
– CO indicator (Monoxor or similar)
– Stack thermometer
– Draft Gauge or inlined manometer
– Two U-Tube manometers or calibrated 0-10” and 0-35” w.c.
pressure gauges
– Combination volt/ammeter
• Attach a gas pressure gauge or manometer to upstream
side of main gas cock and a gas pressure gauge or
manometer to the manifold pressure tapping.
• Check voltage at disconnect switch to make certain that it
matches that shown on the burner label.
• Apply a few drops of No. 20 SAE non-detergent oil to motor
bearings.
• Drill max. 5/16” hole in breeching as close as possible to flue
connection on heater to install stack thermometer and
combustion analyzing equipment, see Figure 4.
• You are now ready to begin the burner start-up procedure.

20
FIGURE11.