Williamson OWB Series 2 User manual
Part Number 550-110-832/1014
Boiler Manual
Series 2
Oil-Fired Water Boilers
Contents Page
1 Prepare boiler location .......................................................2
2 Prepare boiler..................................................................... 5
3 Connect breeching .............................................................5
4 Connect water piping..........................................................7
5 Connect tankless heater piping........................................10
6 Connect wiring..................................................................11
7 Connect oil piping............................................................. 14
8 Start-up ............................................................................15
9 Checkout procedure .........................................................16
10 Appendix ..........................................................................17
11 Service and maintenance................................................. 18
12 Replacement parts ...........................................................22
13 Dimensions.......................................................................26
14 Ratings .............................................................................27
Hazards that will or can cause minor personal
injury or property damage.
Special instructions on installation, operation or
maintenance that are important but not related to
personal injury or property damage.
Hazards that will cause severe personal injury,
death or substantial property damage.
Hazards that can cause severe personal injury,
death or substantial property damage.
Hazard definitions
This manual must only be used by a qualified heating installer/service technician. Boiler and burner must be installed
and serviced only by a qualified heating installer/service technician. Failure to comply could result in severe personal
injury, death or substantial property damage.
When calling or writing about the boiler— Please have: • boiler model number from the boiler rating label and
•CPnumberfromtheboilerjacket.YoumaylisttheCPnumberinthespaceprovidedonthe“Installationandservice
certicate”foundonpage16.
INSTALLER — Read all instructions before
installing. Read page 2 first. Follow all instructions
in proper order to prevent personal injury or
death.
• Considerpipingandinstallationwhendetermining
boiler location.
• Anyclaimsfordamageorshortageinshipment
must be filed immediately against the transportation
company by the consignee.
USER — Please read the following. Failure to
comply could result in severe personal injury,
death or substantial property damage.
• This manual is for use only by your qualified
heating installer/service technician.
• PleaseseetheUser’sInformationManualforyour
reference.
• Have the boiler serviced by a qualied service
technician, at least annually.
2Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Installations must follow these codes:
• Local,state,provincial,andnationalcodes,laws,regulations
and ordinances.
• NFPA-31,InstallationofOil-BurningEquipment.
• StandardforControlsandSafetyDevicesforAutomatically
FiredBoilers,ANSI/ASMECSD-1,whenrequired.
• NationalElectricalCode.
Before locating the boiler:
❏ Checkfornearbyconnectionto:
• Systemwaterpiping
• Ventingconnections(page6)
• Combustionandventilationairprovisions(page4)
• Oilsupplypiping(page14andburnermanual)
• Electricalpower
❏ Check area around boiler. Remove any combustible materials,
gasoline and other flammable liquids.
Failure to keep boiler area clear and free of
combustible materials, gasoline and other flammable
liquids and vapors can result in severe personal
injury, death or substantial property damage.
❏ Boiler must be installed so that burner and control system
componentsareprotectedfromdrippingorsprayingwateror
rain during operation or service.
❏ Ifnewboilerwillreplaceexistingboiler,checkforandcorrect
system problems, such as:
1. System leaks causing oxygen corrosion or section cracks
fromhardwaterdeposits.
2. Incorrectly-sizedexpansiontank.
3. Lackofantifreeze(whenrequired)inboilerwatercausing
systemandboilertofreezeandleak.
Codes & checklist
Failure to adhere to the guidelines below
can result in severe personal injury, death or
substantial property damage.
When servicing boiler —
1. To avoid electric shock, disconnect electrical supply
beforeperformingmaintenance.
2. To avoid severe burns, allow boiler to cool before
performingmaintenance.
Boiler operation —
3. Donotblockowofcombustionorventilationairtoboiler.
4. Shouldoverheatingoccur,donotturnoffordisconnect
electrical supply to circulator. Instead, shut off the oil
supplyatalocationexternaltotheappliance,ifpossible.
5. Donotusethisboilerifanyparthasbeenunderwater.
Immediatelycallaqualiedservicetechniciantoinspect
theboilerandtoreplaceanypartofthecontrolsystem
and any burner control that has been under water.
Boiler water —
6. DO NOT use petroleum-based cleaning or sealing
compounds in boiler system.Water seal deterioration will
occur, causing leakage between boiler sections, circulator
flanges, diaphragm tanks or other system components.
This can result in substantial property damage.
7. DO NOT use “homemade cures” or “boiler patent
medicines”. Serious damage to boiler, personnel and/
or property may result.
8. Continual fresh makeup water will reduce boiler life.
Mineral buildup in sections reduces heat transfer,
overheatscastiron,andcausessectionfailure.Addition
ofoxygenandothergasescancauseinternalcorrosion.
Leaksinboiler or piping mustbe repaired at once to
prevent makeup water.
9. Do not add cold water to hot boiler. Thermal shock can
cause sections to crack.
Glycol — potential fire hazard —
Allglycolisammablewhenexposedtohightemperatures.If
glycol is allowed to accumulate in or around the boiler or any
otherpotentialignitionsource,arecandevelop.Inorderto
prevent potential severe personal injury, death or substantial
propertydamagefromreand/orstructuraldamage:
• Never store glycol of any kind near the boiler or any
potential ignition source.
• Monitor and inspect the system and boiler regularly
for leakage. Repair any leaks immediately to prevent
possibleaccumulationofglycol.
• Neveruse automotiveantifreezeor ethyleneglycol in
thesystem.Usingtheseglycolscanleadtohazardous
leakageofglycolintheboilersystem.
1 Prepare boiler locationRead this first!
3Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
1 Prepare boiler location
Minimum clearance to combustible materials
1. Minimumclearancesfromventpipetocombustiblematerial
(seeFigure1,ventclearancesindicatedwith“*”):
• Type“L”doublewallvent—6inchesminimum
• Singlewallvent—9inchesminimum
Flue pipe clearances must take precedence over
jacketclearances(listedbelow).
Service clearances
1. Recommended service clearances(seeFigure1):
• Frontandtop—24inches
• Leftside,backandrightside—6inches
• Rightsideforburnerdoorswingradius—12inches
2. Special close clearances (alcove, closet, under counters,
etc.)–see“Appendix,”page17.
Clearances Flooring and foundation
Flooring
The OWB and OWT boilers are approved for installation on
combustible flooring, but must never be installed on carpeting.
Donotinstallboileroncarpetingeveniffoundation
is used. Fire can result, causing severe personal
injury, death or substantial property damage.
Foundation
1. Provide a solid brick or minimum 2-inch thick concrete
foundationpadifanyofthefollowingistrue:
• oorcanbecomeooded.
• theboilermountingareaisnotlevel.
2. SeeTable1forminimumfoundationdimensions.
Residential garage installations
Takethefollowingspecialprecautionswheninstallingtheboiler
in a residential garage. If the boiler is located in a residential
garage:
• Mounttheboileraminimumof18inchesabovetheoorof
the garage to ensure the burner and ignition devices will be
no less than 18 inches above the floor.
• Locateorprotect the boiler so it cannot bedamagedbya
moving vehicle.
Table 1 Minimum foundation size
Figure 1 Minimum clearances Boiler
model
number
Length
inches
Width
inches
Minimum
height
inches
OWB/OWT-3 17 22 2
OWB/OWT-4 17 22 2
OWB/OWT-5 20 22 2
OWB/OWT-6 23 22 2
4Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
To prevent potential of severe personal injury or
death, check for products or areas listed below
beforeinstallingboiler.Ifanyofthesecontaminants
arefound:
• removecontaminantspermanently.
— OR —
• isolateboilerandprovideoutsidecombustion air.
Seenational,provincialorlocalcodes forfurther
information.
Pleasereviewthefollowinginformationonpotentialcombustion
air contamination problems.
SeeTable2forproductsandareaswhichmaycausecontaminated
combustion air.
1 Prepare boiler location continued
Air contaminationAir for combustion and ventilation
Adequate combustion and ventilation air:
• Assurespropercombustion.
• Reducesriskofseverepersonalinjuryordeathfrom
possible flue gas leakage and carbon monoxide
emissions.
• Donotinstallexhaustfaninboilerroom.
Consider building construction
Older buildings with single-pane windows, minimal weather-
stripping and no vapor barrier often provide enough natural
infiltration and ventilation without dedicated openings.
New construction or remodeled buildings are most often built
tighter. Windows and doors are weather-stripped, vapor barriers
are used and openings in walls are caulked. As a result, such
tight construction is unlikely to allow proper natural air infiltration
and ventilation.
Follow state, provincial or local codes when sizing adequate
combustion and ventilation air openings. In absence of codes,
usethefollowingguidelineswhenboilerisinaconnedroom
(denedbyNFPA 31 asless than 7200 cubic feet per 1 GPH
inputofallappliancesinarea.Aroom8ft.highx30.0ft.x30.0
ft.is7200cu.ft.).
Provide two permanent openings:
One within 12 inches of ceiling, one within 12 inches of oor.
Minimumheightorlengthdimensionofeachrectangularopening
should be at least 3 inches.
When inside air is used:
Eachopeningmustfreelyconnectwithareashavingadequate
inltrationfromoutside.Eachopeningshouldbeatleast140sq.
in.per1GPHinput(1sq.in.per1000Btuinput)ofallfuel-burning
appliancesplusrequirementsforanyequipmentthatcanpullair
fromroom(includingclothesdryerandreplace).
When outside air is used:
Connect each opening directly or by ducts to the outdoors or to
crawloratticspacethatfreelyconnectswithoutdoors.Sizeper
below:
• Throughoutsidewallorverticalducts—atleast35sq.in.per
1GPHinput(1sq.in.per4000Btuinput)ofallfuelburning
appliancesplusrequirementsforanyequipmentthatcanpull
airfromroom(includingclothesdryerandreplace).
• Through horizontal ducts — at least 70 sq. in. per 1 GPH
boilerinput(1sq.in.per2000Btuinput)ofallfuel-burning
appliancesplusrequirementsforanyequipmentthatcanpull
airfromroom(includingclothesdryerandreplace).
• Where ducts are used, they should have same cross-
sectionalareaasfreeareaofopeningstowhichtheyconnect.
Compensate for louver, grille or screen blockage when
calculating free air openings. Refer to their manufacturer’s
instructionsfordetails.Ifunknown,use:
• Woodlouvers,whichprovide20-25%freeair.
• Metallouversorgrilles,whichprovide60-75%freeair.
Locklouversinopenpositionorinterlockwithequipmentto
proveopenbeforeboileroperation.
Table 2 Corrosive contaminants and likely locations
Products to avoid
Spray cans containing chloro/uorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents
found in household laundry rooms
Adhesives used to fasten building products and other similar
products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture renishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
5Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Failuretofollowallinstructionscanresultinuegas
spillage and carbon monoxide emissions, causing
severe personal injury or death.
Inspect existing chimney before installing boiler.
Insufcientdraftcancause ue gas leakage and
carbon monoxide emissions. Failure to clean or
replaceperforatedpipeortileliningand/orpatch
mortar and joints can cause severe personal injury
or death.
• TheOWBandOWTboilersaredesignedtooperatewithan
over-redraftof-0.01”to-0.02”w.c.Properdraftfortheseoil
boilers may be achieved using either a conventional chimney
(naturaldraft)orapowervent(sidewall)systemthathasbeen
properlydesignedforusewithoil-redequipment.Powervent
manufacturer’sinstructionsmustbefollowed.
• Useventmaterialapprovedbylocalcodesforoil-redburners.
Intheirabsence,referto:
• NFPA31,InstallationofOil-BurningEquipment.
• NFPA211,StandardforChimneys,Fireplaces,Ventsand
Solid Fuel Burning Appliances.
• NFPA211requireschimneytobelinedbeforeconnecting
to boiler.
• Topreventdowndrafts,extendchimneyatleast3feetabove
highestpointwhereitpassesthroughroofand2feethigher
thananyportionofbuildingwithin10feet.Increasechimney
cross-sectionalareaandheightatleast4%per1,000feet
above sea level.
• Provide minimum clearances from vent (flue) pipe to
combustible material:
• Type“L”doublewallvent—6inchesminimum
• Singlewall vent — 9 inches minimum
• Minimumchimneysizesshouldbeused.SeeTable3,page6.
Oversized chimneys, outside masonry chimneys
and/or derated inputs can result in condensation in
chimney.
Place boiler
The boiler contains ceramic fiber and fiberglass
materials.Usecarewhenhandlingthesematerials
perinstructionsonpage21ofthismanual.Failure
to comply could result in severe personal injury.
1. Remove circulator carton strapped to pallet.
Circulatorwillbedamagedifnotremoved before
boilerisliftedfrompallet.
2. Removeboilerfrompallet.
Do not drop boiler or bump jacket or burner on floor
or pallet. Damage to boiler or burner can result.
Smallersizedboilersmaybetopheavy.Usecaution
when handling to avoid minor personal injury or
property damage.
3. Checklevel.Shimlegsifneeded.
4. Openburnermountingdoor.Verifythatchamberceramicliner
is securely in place on target wall, chamber floor and burner
door.Verifydoorsealisintactandinplace.Closeandsecurely
bolt the door.
6. Visuallycheck:
a. Flue collector hood seal.
b. Burner mounting door seal.
Obtaingas-tightsealtopreventpossibleuegas
leakage and carbon monoxide emissions, which
can lead to severe personal injury or death.
Hydrostatic pressure test
1. Installairventinairventtappingontopofboiler(seeFigure
19,page26,forlocation).
3. Plug supply and return tappings.
4. Drainvalveisfactory-installed.
5. Fillboiler.Ventallair.Pressuretestboilerat1½timesworking
pressure.
Do not leave boiler unattended. Cold water fill can
expand and damage cast iron, resulting in severe
personal injury, death or substantial property
damage.
6. Verifythatboilermaintainspressureforatleast10minutes.
Visuallycheckforleaksifgaugepressuredrops.
7. Drainboiler.Repairleaksiffound.
Usingpetroleum-basedcompoundstorepairleaks
can damage system components, resulting in
property damage.
8. Retestboilerafterrepairingleaks.
9. Remove air vent and plugs.
2 Prepare boiler 3 Connect breeching
General venting requirements
6Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Connect breeching
Longhorizontalbreechings,excessive numberof
tees and elbows, or other obstructions restricting
combustion gas flow can result in possibility
of condensation, flue gas leakage and carbon
monoxide emissions, which can lead to severe
personal injury or death.
SeeFigure2a.Backoutlet(Standard).
1. ForTopoutlet(availableonlywithoptional“TopVentService
Kit”,SeeSection12“ReplacementParts”)SeeFigure2b.
2. Connectfull-sizedbreechingwhenpossible.SeeTable3.
3. Connectionmustbemadeabovebottomofchimneytoavoid
blockage.Breechingmustnotenterchimneyfarenoughto
causeobstruction.Usethimbleorslipjointwherebreeching
enterschimneytoallowremovalforcleaning.
3 Connect breeching
Figure 2a Standard back outlet chimney and breeching
connections
Table 3 Chimney and breeching minimum sizes
Boiler
model
number
Minimum
breeching
diameter
Note 1
Minimum
chimney size Minimum
chimney
height
Rectangle
Note 2
Round
OWB/OWT-3 5” 8” x 8” 6” 15’
OWB/OWT-4 6” 8” x 8” 6” 15’
OWB/OWT-5 6” 8” x 8” 7” 15’
OWB/OWT-6 7” 8” x 8” 7” 15’
Notes:
1. Flue collar on boiler is 7.00” diameter.
2. 6-3/4” x 6-3/4” inside liner
Figure 2b Top outlet breeching connection
(only with optional “Top Vent Service Kit” ).
Connect breeching (continued)
4. Whenburnerandboilerareproperlyinstalled,draftoverre
willbeapproximately-0.01”to-0.02”W.C.Installbarometric
controlinbreeching,percontrolmanufacturer’sinstructions,
whenexcessdraft needs to berelievedorto comply with
applicablecodesandregulations.Usedraftgaugetoadjust
proper opening.
5. Aninduceddraftfanforthechimneymaybenecessaryif:
• Excessiveresistancetoowofcombustiongasescanbe
expected.
• Cross-sectionalareaofchimneyissmallerthanminimum
recommended.
• Chimneyheightislessthanrecommended.
• Sealallventjoints.Interlockburnerwithfanoperation.
Typical location for
Barometric Control
(Also see Control
Manufacturer’s
Instructions)
Flue Pipe Bracket
(one on each side of
pipe)
Typical location for
Barometric Control
(Also see Control
Manufacturer’s
Instructions)
Flue Pipe
Bracket
(one on each
side of pipe)
7Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
4 Connect water piping
Expansion tank
Diaphragm- or bladder-type expansion tank — Figure 3,
page 8
1. Ensure expansion tank size will handle boiler and system
water volume and temperature.Tank must be located in boiler
returnpipingasclosetoboileraspossible,beforeinletside
ofcirculator.Seetankmanufacturer’sinstructionsfordetails.
2. Installanautomaticairventasshown.
Closed-type expansion tank — Figure 4, page 8
1. Ensureexpansiontanksizewillhandleboilerandsystemwater
volumeandtemperature.Seetankmanufacturer’sinstructions
fordetails.
2. Connecttankto½”NPTtappinglocatedbehindsupplyoutlet,
using½”NPTpiping.Pitchanyhorizontalpipinguptowards
tank1inchper5feetofpiping.
Undersizedexpansiontanks cause system water
tobelostfromreliefvalveandmakeupwatertobe
addedthroughllvalve.Eventualsectionfailurecan
result.
General
If installation is to comply with ASME an additional high
temperaturelimitisneeded.Installcontrolinsupplypipingbetween
boiler and isolation valve. Set second control to minimum 20 °F
abovesetpointofrstcontrol.Maximumallowablesetpointis240
°F.Seepage13forwiring.
Alowwatercutoffdeviceisrequiredwhenboilerisinstalledabove
radiation level or by certain state or local codes or insurance
companies.Uselowwatercutoffdesignedforwaterinstallations.
Electrodeprobe-typeisrecommended. Purchaseandinstallin
tee in supply piping above boiler.
Usebackowcheckvalveincoldwatersupplyifrequiredbylocal
codes.
Water piping — multiple zone systems
Installsystempipingusingeithercirculatorzoningorzonevalve
zoning.Installexpansiontankonsuctionsideofsystempump.
Always connect fill line only at the expansion tank — never at
another point in the system.
Relief valve
Installreliefvalveverticallyin¾”tappingonrearofboilerusing¾”
nipple and elbow supplied in bag with valve. See the tag attached
tothereliefvalveformanufacturer’sinstructions.
To avoid water damage or scalding due to valve
operation, discharge line must be connected to
reliefvalveoutletandruntoasafeplaceofdisposal.
Terminate the discharge line to eliminate possibility
ofsevereburnsshouldthevalvedischarge.
• Dischargelinemustbeasshortaspossibleandbe
the same size as the valve discharge connection
throughout its entire length.
• Dischargelinemustpitchdownwardfromthevalve
and terminate at least 6” above the floor drain where
any discharge will be clearly visible.
• Thedischargelineshallterminateplain,notthreaded,
with a material serviceable for temperatures of
375 °F or greater.
• Do not pipe the discharge to any place where
freezingcouldoccur.
• Noshutoffvalveshallbeinstalledbetweentherelief
valve and boiler, or in the discharge line. Do not plug
or place any obstruction in the discharge line.
• Failuretocomplywiththeaboveguidelinescould
resultinfailureofthereliefvalvetooperate,resulting
in possibility of severe personal injury, death or
substantial property damage.
• Test the operation of the valve after lling and
pressurizingsystembyliftingthelever.Makesure
the valve discharges freely. If the valve fails to
operatecorrectly,replaceitwithanewreliefvalve.
Circulator
The circulator is shipped loose (wiring pre-attached to boiler)
to allow you to locate it either in the return or supply piping, as
desired.Seepage8foratypicalinstallation.Pipetheexpansion
tanktothesuctionsideofthecirculatorwheneverpossible.Install
an air separator in the supply piping. Connect the expansion tank
totheairseparatoronlyiftheseparatorisonthesuctionsideof
the circulator. Always install the system fill connection at the same
point as the expansion tank connection to the system. Figures 3
and 4, on page 8, show typical near-boiler piping connections.
Near-boiler piping continued
SeeFigure3(diaphragm-typeorbladder-typeexpansiontank)
orFigure4(closed-typeexpansiontank)onpage8,andTable
4, for near-boiler and single-zone systems designed for return
wateratleast130°F.SeeFigure6or7,page9forlowreturn
temperature applications.
Seethispageformultiple-zonepiping.
Seepage8forboilersusedwithrefrigerationsystems.
Near-boiler piping
Boiler
model
number
To
system
From
system
OWB/OWT-3 1-1/4” 1-1/4”
OWB/OWT-4 1-1/4” 1-1/4”
OWB/OWT-5 1-1/2” 1-1/2”
OWB/OWT-6 1-1/2” 1-1/2”
All piping sizes based on 20° F temperature rise through boiler.
Table 4 Water pipe size (based on 20 °F rise)
Boiler
model
number
To
system
From
system
OWB/OWT-3 1-1/4” 1-1/4”
OWB/OWT-4 1-1/4” 1-1/4”
OWB/OWT-5 1-1/2” 1-1/2”
OWB/OWT-6 1-1/2” 1-1/2”
All piping sizes based on 20° F temperature rise through boiler.
8Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Water piping — refrigeration systems
Prevent chilled water from entering boiler
Installboilersothatchilledmediumispipedinparallelwiththe
heatingboiler.Useappropriatevalvestopreventchilledmedium
from entering boiler. See Figure 5 for typical installation of
balancing valve and check valve.
Figure 3 Diaphragm- or bladder-type expansion
tank:
Piping to single-zone system using
diaphragm-type or bladder-type expansion
tank. See Table 4, page 7, for piping sizes.
Figure 4 Closed-type expansion tank: Piping to
single-zone system using closed-type
expansion tank. See Table 4, page 7, for
piping sizes.
Figure 5 Piping refrigeration systems
Install boiler so that chilledmedium is piped in
parallelwithheatingboiler.Useappropriatevalvesto
preventchilledmediumfromenteringboiler.Consult
I=B=RInstallationandPipingGuides.
If boiler is connected to heating coils located in
air handling units where they can be exposed to
refrigerated air, use ow control valves or other
automatic means to prevent gravity circulation
during cooling cycle. Circulation of cold water
through the boiler could result in damage to the heat
exchanger, causing possible severe personal injury,
death or substantial property damage.
Ifsystemincludesradiantheatingcircuits,provide
piping and controls to regulate the temperature
supplying the radiant circuits. Failure to comply could
result in substantial property damage.
UseFigure3orFigure4onlyforsystemsdesigned
forreturn waterat least130°F. Forsystemswith
low return water temperature possible, such as
converted gravity systems and radiant heating
systems, install by-pass piping (see page 9) to
protect boiler against condensation. Failure to
prevent low return water temperature to the boiler
could cause corrosion of the boiler sections or
burners, resulting in severe personal injury, death
or substantial property damage.
4 Connect water piping continued
9Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Near-boiler piping continued
4 Connect water piping continued
System bypass method
1. ApplybypasspipingofFigure6tohighwatercontentsystems,
radiant panel systems or any system that is likely to operate
withlowreturnwatertemperatureforextendedperiods.
2. The bypass arrangement shown protects the boiler from
damage caused by condensate corrosion due to low return
watertemperatureandprotectslowtemperaturesystemsfrom
too high a supply temperature.
3. Adjust the bypass valves as indicated below.
Adjust Bypass valves 1 and 2 as follows:
1. Startwithvalve2fullyclosed,valve1fullyopen.
2. Slowly open valve 2 while closing valve 1. Adjust the valves
until the boiler pressure/temperature gauge reads 160 °F or
higher. As you open the valves, pause long enough to allow
temperaturestoleveloff.Ittakesawhilefortheboilerwater
temperature to rise as the flow changes.
3. Bypass valve 2 allows hot boiler outlet water to blend with
colder return water, raising the supply temperature to the boiler.
Bypass valve 1 balances the pressure drop through valve 2.
4. The purpose of this piping is to raise the return water
temperaturetotheboilerenoughtopreventcondensationof
flue gases.
Boiler bypass method
1. ApplybypasspipingofFigure7tohighwatercontentsystems,
such as converted gravity systems.
2. The bypass arrangement shown protects the boiler from
damage caused by condensate corrosion due to low return
water temperature. This method does not provide protection
fromhightemperaturewaterbeingsuppliedtothesystem.
3. DONOTapplythispipingtoradiantpanelsystems.
4. Adjust the bypass valves as indicated below.
Adjust Bypass valves 1 and 2 as follows:
1. Startwithvalve1fullyclosed,valve2fullyopen.
2. Slowly open valve 1 while closing valve 2.Adjust the valves until
the boiler pressure/temperature gauge reads approximately
60 °F higher than the system temperature gauge.As you open
the valves, pause long enough to allow temperatures to level
off.Ittakesawhilefortheboilerwatertemperaturetoriseas
the flow changes.
3. Bypass valve 1 controls system flow rate. Bypass valve 2
controls flow through the boiler.
4. The purpose of this piping is to cause a high enough
temperature rise in the boiler that the average temperature
willbewarmenoughtopreventcondensationofuegases.
Figure 6 System bypass piping in boiler loop with
separate system circulator, using primary/
secondary piping.
Figure 7 Boiler bypass piping — use only for high
water content systems —DO NOT use for
radiant panel systems.
Installallcomponentsspeciedaboveandadjustvalvesasdescribedtopreventlowtemperatureintheboiler.Failureto
preventlowwatertemperatureintheboilercouldcausecorrosionoftheboilersectionsorburners,resultinginsevere
personal injury, death or substantial property damage.
10 Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
5 Connect tankless heater piping (OWT boilers only)
Hot water can scald!
• ConsumerProductSafetyCommissionandsome
states recommend domestic hot water temperature
of130°Forless.
• Wheninstallinganautomaticmixingvalve,
selection and installation must comply with valve
manufacturer’srecommendationsandinstructions.
• Waterheatedtoatemperaturesuitableforclothes
washing, dish washing and other sanitizing needs
will scald and cause injury.
• Childrenandelderly,inrmorphysicallyhandicapped
persons are more likely to be injured by hot water.
Never leave them unattended in or near a bathtub,
shower or sink. Never allow small children to use a
hotwaterfaucetordrawtheirownbath.Ifanyone
using hot water in the building fits this description,
orifstatelawsorlocalcodesrequirecertainwater
temperatures at hot waterfaucets, take special
precautions:
• Installautomaticmixingvalvesetaccordingto
those standards.
• Uselowestpracticaltemperaturesetting.
• Checkwatertemperatureimmediatelyafterrst
heatingcycleandafteranyadjustment.
Studies have indicated that dangerous bacteria
can form in potable water distribution systems
if certain minimum water temperatures are not
maintained. Contact local health department for
moreinformation.
These single wall heat exchangers comply with
National Standard Plumbing Code provided that:
• Boiler water (including additives) is practically
nontoxic,havingtoxicityratingorclassof1,aslisted
inClinicalToxicologyofCommercialProducts.
• Boilerwaterpressureislimitedtomaximum30psig
byapprovedwaterreliefvalve.
Pipe tankless heater
1. Size piping no smaller than tankless heater inlet and outlet.
2. Followingcontrols(furnishedbyothers)mustbeinstalled:
a. Automaticmixing valve.SeeFigure8.(ReadDANGER
statementatleft.)
b. Flowregulatingvalve(seeFigure8). Sizeaccordingto
intermittentdrawoftanklessheater.SeeTable5.Follow
valvemanufacturer’sinstructionstoinstall.
3. Additional anti-scald devices may be installed at each hot
waterfaucet,bathandshoweroutlet.
4. In hard water areas, soften cold domestic supply water to
heaters to prevent lime buildup.
Tankless heater ratings are based on 200°F boiler
water temperature.To get rated output, set tankless
heater control to 200°F. Control can be adjusted to
meet system hot water requirements.
Figure 8 Piping connections to tankless heater, typical
Table 5 Tankless heater ratings
Boiler
model
number
Heater
number
Intermittent
draw ratings
(GPM)
Inlet and
outlet
tapping sizes
OWT-3 WT-11 3.00 (note 1) 1/2”
OWT-4 WT-14 3.75 (note 2) 1/2”
OWT-5 WT-14 4.00 (note 2) 1/2”
OWT-6 WT-14 4.25 (note 2) 1/2”
Note
1: Gallons of water per minute heated from 50°F to 140°F with
200°F boiler water temperature.
2: Gallons of water per minute heated from 40°F to 140°F with
200°F boiler water temperature.
Tested in accordance with I=W=H Testing and Rating Standard for
Indirect Tankless Water Heaters Tested with Boilers.
11Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
6 Connect wiring
Electricshockhazard.Cancauseseverepersonal
injuryordeathifpowersource,includingservice
switchonboiler,isnotdisconnectedbeforeinstall-
ing or servicing.
Installations must follow these codes:
• NationalElectricalCode,ANSI/NFPA70,latesteditionand
any additional national, state or local codes.
• WiringmustbeN.E.C.Class1.Iforiginalwireassupplied
with boiler must be replaced, type 105 °C wire or equivalent
must be used. Supply wiring to boiler and additional control
wiring must be 14 gauge or heavier.
• Provideelectricalgroundatboilerasrequiredbycodes.
Thermostat wiring
• Install thermostat on inside wall away from inuences of
drafts,hot or cold water pipes, lighting fixtures, television,
sun rays or fireplaces.
• Follow instructions with thermostat. If it has a heat
anticipator, set heat anticipator in thermostat to match power
requirements of equipment connected to it. Boiler wiring
diagramsshowninthismanual,givesettingsforstandard
equipment.
Burner wiring
• Burnerharnessincorporatesadisconnectplug,providinga
convenient way to disconnect wiring when burner mounting
door is opened. See Figure 9.
Wiring entrance
• Thelimitcontrolenclosurehouseselectricalconnectionsfor
all boiler components.
• Boilershaveharnessesfurnished.SeeFigure10,page13,
forOWBboilersandOWTboilersforfactoryandeldwiring
information.
• Alleld-installedhighvoltagewiring mustbesheathedin
metal conduit.
• ConnectincominglinevoltagewiresasshowninFigure10.
Field-install equipment ground wire to green wire with wire
nut.
• Somelocalcodesmayrequireanemergencyshut-offswitch
installedatalocationawayfromboiler.Followlocalcodes.
Figure 9 Electrical components and harnesses
High Temperature Limit
Installation requirements.
Do not tamper with the unit or controls.
• To comply with ASME, UL 726 or Canadian requirements,
an additional high temperature limit is needed. Install control
in supply piping between boiler and isolation valve. Set control
to a minimum of 20°F above set point of combination control.
Maximum allowable set point is 220°F. Wire control as shown
on wiring diagram.
12 Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
NOTES Thispageleftintentionallyblank.
13Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Figure 10 Wiring diagram — OWB and OWT boilers
6 Connect wiring continued
4
14 Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
7 Connect oil piping
General oil piping requirements
• Locationandinstallationofoiltanks,oilpipingandburners
mustfollow:
• NFPA 31, Standard for the Installation of Oil-Burning
Equipment.
• Localcodesandregulations.
• Informationprovidedwithburnerandfuelpump.
• Ifanypartoffueloiltankisabovelevelofburner,ananti-siphon
deviceinstallationishighlyrecommendedtopreventowof
oilincaseofoillinebreak.
• Supportoillinesasrequiredbycodes.
• Maketankconnectionswithswingjointsorcoppertubingto
preventbreakingincasethetanksettles.Makeswingjoints
so they will tighten as tank settles. Non-hardening pipe joint
compounds should be used on all threads.
DonotuseTeontapeasanoilpipesealant.Itcan
causevalvestofail,creatinghazards.Useonlyare
fittings. Do not use compression fittings. Failure to
comply could result in severe personal injury, death
or substantial property damage from oil leakage
and/or fire hazard.
• Undergroundpipemustberuninacasingtopreventoilleaking
intogroundorunderoor.Checklocalcodesforinformation.
Oil piping connection at burner
• SeeFigure11fortypicaloil connection atburner,allowing
burnermountingdoortoswingopencompletelyforservicing.
• Connectoillinetoburnerusingaretting(Figure11).
• Seelocalcodesforappropriatearrangementandpipingof
filter, control valves, etc. connecting to oil tank.
• Refertoburnermanualforoilsystemrequirements.Verifythat
suctionliftdoesnotexceedstatedlimit.Whereliftexceeds
limitforaone-pipesystem,useatwo-pipesystemasdirected
in burner manual.
Figure 11 Oil piping connection to burner, typical
15Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
8 Start-up
For additional information, refer to instructions packed with boiler or
burner:
• BurnerManual
• Componentliterature
Followinformationbelowtopreventseverepersonal
injury, death or substantial property damage:
• Do not use gasoline crankcase drainings or any oil
containinggasoline.Seeburnermanualforproper
fueloil.
• Donotattempttostartburnerwhenexcessoilhas
accumulated, when unit is full of vapor or when
combustion chamber is very hot.
• Donotstartburnerunlesscollectorhood,breeching
and burner mounting door are secured in place.
• Neverburngarbageorpaperintheboiler.
• Neverleavecombustiblematerialaroundit.
Fill the system
1. Close manual and automatic air vents and boiler drain cock.
2. Fill to correct system pressure. Correct pressure will vary
with each installation. Normal cold water ll pressure for
residential systems is 12 psig. Boiler water pH 7.0 to 8.5 is
recommended.
Failure to maintain recommended pH level can cause
sectionfailureandleaks.
3. Openautomaticairventoneturn.
4. Openothervents.
a. Starting on the lowest floor, open air vents one at a time
until water squirts out. Close vent.
b. Repeat with remaining vents.
5. Refill to correct pressure.
Tips for water systems
• Checkboilerandsystempipingforleaks.Continualmakeup
waterwillreduceboilerlife.Mineralscanbuildupinsections,
reducing heat transfer and causing cast iron to overheat,
resultinginsectionfailure.
Failure to maintain recommended pH and repair
leaks can cause section iron corrosion, leading to
section failure and leaks. Do not use petroleum-
based sealing or stop-leak compounds in boiler
system. Damage to system components can
result.
• ForpHconditionsoutside7.0to8.5rangeorunusuallyhard
waterareas(above7grainshardness),consultlocalwater
treatment company.
• Whenusingantifreeze:
Do not use automotive, ethylene glycol, undiluted or
petroleum-basedantifreeze.Severepersonalinjury,
death or substantial property damage can result.
• Useantifreezeespeciallymadeforhydronicsystems.Inhibited
propylene glycol is recommended.
• 50%solutionprovidesprotectiontoabout-30°F.Donotexceed
50%mixture.
• Local codes may require backflow preventer or actual
disconnectfromcitywatersupply.
• Determine quantity according to system water content. Boiler
watercontentislistedonbackcoverofmanual.Percentof
solutionwillaffectsizingofheatdistributionunits,circulator
and expansion tank.
• Followantifreezemanufacturer’sinstructions.
Place in operation
1. Verifyboilerislledwithwater.
2. Openburnermountingdoorandverifyreartargetwall,oorand
burner door insulations are in proper position and condition.
3. Verifyburnermountingdoorisclosedtightlyandburnerwiring
harness is connected securely.
4. Factory burner adjustment and settings may not be suitable
forspecicjobconditions.Refertoburnermanualforburner
start-up, adjustment and checkout procedures.
5. Burnershouldbeadjustedto13%CO2orlesswithasmoke
levelofzeroandover-reof-0.01”to -0.02”. Re-adjust burner
combustiontoaccountforenvironmentalconditions.Actual
CO2valuewillvaryandshouldbeadjustedforcleanandsafe
combustionoperation.Seasonalvariationsaswellassufcient
combustionairsupplycanaffectpropercombustionandboiler
performance.Theburnershouldonlybeadjustedbyaservice
professionalwithappropriateinstrumentation.
Make nal burner adjustments using combustion
test equipment to assure proper operation. Do not
fire boiler without water. Sections will overheat,
damaging boiler and resulting in substantial property
damage.
6. Ventairfromsystem.Repeatsteps4and5 under“Fillthe
system”.Airinsystemcaninterferewithwatercirculationand
cause improper heat distribution.
7. Checkboilerandsystempipingforleaks.See“Tipsforwater
systems” on this page.
8. Inspectbreechingandventingforproperoperation.
16 Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Boiler model _______________________________________________________________ Series ____________
CP number _______________________________________ Date installed _________________________________
Measured Btuh input ____________
Installer _______________________ ______________________________ __________________________________
(company) (address) (phone)
__________________________________
(installer’s signature)
Installation instructions have been followed.
Checkout sequence has been performed.
Above information is certified to be correct.
Information received and left with owner/maintenance person.
9 Checkout procedure
❑ 1. Boiler and heat distribution units filled with water?
❑ 2. Automaticairvent,ifused,openedonefullturn?
❑ 3. Airpurgedfromsystem?Pipingcheckedforleaks?
❑ 4. Airpurgedfromoilpiping?Pipingcheckedforleaks?
❑ 5. Burner door closed, sealed and nut tight? Burner harness
securely plugged in?
Obtaingas-tightsealtopreventpossibleuegas
leakage and carbon monoxide emissions, leading
to severe personal injury or death.
❑ 6. Properdraftandburnerame?Finaladjustmentmade
with combustion test equipment?
❑ 7. Test limit control: While burner is operating, move
indicator on limit control below actual boiler water
temperature. Burner should go off while circulator
continues to operate. Raise setting on limit control above
water temperature and burner should reignite.
❑ 8. Testadditionaleld-installedcontrols:Ifboilerhasalow
watercutoff,additionalhighlimitorothercontrols,test
foroperationasoutlinedbymanufacturer.Burnershould
beoperatingandshouldgooffwhencontrolsaretested.
When controls are restored, burner should reignite.
❑ 9. Limit control set to system temperature requirements
(maximum220°F)?
❑ 10. For multiple zones, flow adjusted to distribute heat in all
zones?
❑ 11. Thermostat heat anticipator setting (if available) set
properly?Referto“Connectwiring,”page11.
❑ 12. Boiler cycled with thermostat? Raise to highest setting
and verify boiler goes through normal start-up cycle.
Lowertolowestsettingandverifyboilergoesoff.
❑ 13. Observedseveraloperatingcyclesforproperoperation?
❑ 14. Setroomthermostat(s)todesiredroomtemperature?
❑ 15. Completed“Installationandservicecerticate”below?
❑ 16. Reviewed User’s Information Manual with owner or
maintenancepersonandinstructedpersontokeepfor
futurereference?
❑ 17. Returned all instructions provided with boiler to its
envelopeandplacedwithboilerforfuturereference?
Check off steps as completed
Installation and service certicate
17Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
10 Appendix
Close clearance installation
Figure 14 Protection required for close clearance
Figure 12 Manual reset temperature switch
wiring and location
Figure 13 Minimum vent clearances
To provide close clearances as described on this
page, obtain Close Clearance Kit Part Number
386-500-050WT and install as described below.
Failure to use kit or install as described can result
in a fire hazard, causing severe personal injury,
death or substantial property damage.
Substitutetheseinstructionsforcorrespondingmaterialinmanual.
All other procedures and practices must remain the same.
Recommended service and minimum clearances shown on page
3 should be used where possible.
Where closer clearances are required:
• Topofboiler–Iflessthan24”available,provideremovable
surfacetoallowforcleaningboilerueways.
• Rightorleftside–Minimum2inches.
• Front–Minimum2inchesfromburner.
• Type“L”doublewallue(vent)pipetocombustiblesurface–as
listed in Table below and Figures 13 and 14.
Flue pipe clearances must take precedence over
jacket clearances.
1. Installboilerusingclearancesdescribedabove.
2. Install barometric control 18 to 20 inches from boiler in
breeching.
3. Attachmanualresettemperatureswitchnearuppersurface
ofenclosedarea.SeeFigure12.
4. Wire switch in series with thermostat. See Figure 12.
5. Provide two combustion/ventilation openings when installing in
connedspace.Sizeopening140sq.in.(1000Btu)per1GPH
input.Locateopeningsneartopandbottomofenclosedspace.
Protection required for clearance less than 6” from
doublewall vent pipe (Note 1)
Dimension A
When desired minimum
clearance from Type “L”
doublewall vent pipe to
combustible surface is:
Use the following protection
(Note 2):
3”
½” thick insulation board (Note 3) over
one-inch glass ber or mineral wool batts
(Note 4)
2” 24 gauge sheet metal with
one-inch ventilated air space
3” ½” thick insulation board (Note 3) with
one-inch ventilated air space
Notes:
1. All clearances measured from outer surface of equipment to combustible
surface, not to the protection used.
2. Apply to combustible surface unless otherwise noted. Cover all surfaces as
specied in Table above and Figure 13. Thicknesses are minimum.
3. Factory-fabricated board made of non-combustible materials, usually
mineral wool, having thermal conductivity in range of one (Btu-inch)/(hr/sq.
ft/°F) or less.
4. Mineral wool batts (blanket or board), having minimum density of
8 lb/ft3 and a minimum melting point of 1500 °F.
18 Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
11 Service and maintenance
Theboilershouldbeinspectedandstartedannually,atthebeginningoftheheatingseason,onlybyaqualiedservice
technician. Inaddition,themaintenance andcareofthe boilerdesignatedinthetablebelow, andexplainedonthe
followingpagesmustbeperformedtoassuremaximumboilerefciencyandreliability.Failuretoserviceandmaintain
theboilerandsystemcouldresultinequipmentfailure.
Followthe“Serviceandmaintenance”proceduresgiventhroughoutthismanualandincomponentliteratureshipped
withtheboiler.Failuretoperformtheserviceandmaintenancecouldresultindamagetotheboilerorsystem.Failureto
followthedirectionsinthismanualandcomponentliteraturecouldresultinseverepersonalinjury,deathorsubstantial
property damage.
Annual service and start-up
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19Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
Cleaning boiler flueways
The boiler contains ceramic fiber and fiberglass
materials.Usecarewhenhandlingthesematerials
perinstructionsonpage21ofthismanual.Failure
to comply could result in severe personal injury.
Figure 15 Cleaning boiler ueways — Thoroughly
clean ueways between all pins at all
angles. Start on top of boiler, nish from
the bottom.
Make sure all electrical connections to boiler are
turned off and wait until boiler is warm, not hot,
beforecleaning.Failuretodosowillresultinsevere
personal injury, death or substantial property damage.
1. Remove jacket top panel.
2. Removeuecollectorhood,savinghardwareforreassembly.
3. Shutoffoilvalves.Arrangedrippansundertheareasofoil
piping that will be disconnected. Disconnect oil line at burner
so that you can swing open the door completely.
4. Linecombustionchamberoorwithnewspapertocatchany
soot that will be loosened in the cleaning process.
5. Starting at the top of the boiler, use a wire ue brush to
thoroughlycleanbetweenallpinsatallangles.Becarefulnot
todamagesidewallsofrearrefractory.
6. Movetothebottomoftheuewaysandcleanupbetweenthe
sectionstoreachpinsleftuncleanedinstep#5.
7. Oncetheuewaysarecleaned,carefullyremovethepaper
fromtheoorofthecombustionchamber.Foldthepaperto
capturetherefuse,sealinaplasticbag,anddispose.
8. Verifysealingropearoundueareaisintact.Visuallycheck
conditionandpositionofinsulationincombustionchamber
oor,andtherefractoriesattherearofboilerandintheburner
mounting door. Replace any parts as necessary.
9. Close burner mounting door and tighten nut securely. Place
uecollectorhoodontopofboiler.Securewithhardwarefrom
step#2.Maintainagas-tightsealtoavoidpossibleuegas
leakage and carbon monoxide emissions, which can lead to
severe personal injury or death.
10.Checkbreechingforsootingandcleanifnecessary.Re-install
jacket top panel and breeching.
11. Reconnect oil line and all electrical connections.
WearaNIOSH-certieddustrespirator(N95)while
cleaningtheboiler,perWARNINGonpage21.Failure
to comply could result in severe personal injury.
11 Service and maintenance continued
20 Part Number 550-110-832/1014
OWB & OWT
Series 2 Oil-Fired Water Boilers – Boiler Manual
11 Service and maintenance continued
Fill the system: Annual service
1. Close manual and automatic air vents and drain cock.
2. Fill to correct system pressure. Correct pressure will vary
with each installation. Normal cold water ll pressure for
residential systems is 12 psig. Boiler water pH 7.0 to 8.5 is
recommended.
Failure to maintain recommended pH level can cause
section failure and leaks, resulting in potential of
severe personal injury, death or substantial property
damage.
3. Openautomaticairvent(ifinstalled)oneturn.
4. Starting on the lowest floor, open manual air vents one at a time
until water squirts out. Close vent. Repeat with remaining vents.
5. Refill to correct pressure.
Followinformationbelowtopreventseverepersonal
injury, death or substantial property damage:
• Donotusecrankcasedrainingsoranyoilcontaining
gasoline.Seeburnermanualforproperfueloil.
• Donotattempttostartburnerwhenexcessoilhas
accumulated in combustion chamber, when unit is
fullofvapor,orwhencombustionchamberisvery
hot.
• Donotstartburnerunlesscollectorhood,breeching
and burner mounting door are secured in place.
Never burn garbage or paper in the boiler.
• Neverleavecombustiblematerialaroundboiler.
1. Verifyboilerislledwithwater.
2. Openburnerdoorandverifyreartargetwall,oorandburner
door insulations are in proper condition and position.
3. Verifyburnermountingdoorisclosedandboltedtightlyand
burner plug is connected.
4. Refertoburnermanualforburnerstart-up,adjustmentand
checkout procedures. Factory burner adjustment and settings
maynotbesuitableforspecicjobconditions.
Make nal burner adjustments using combustion
test equipment to assure proper operation. Do not
fire boiler without water. Sections will overheat,
damaging boiler and resulting in substantial property
damage.
5. Checkboilerandsystempipingforleaks.
6. Inspectbreechingandventingforproperoperation.
Boiler relief valve
1. Inspectthereliefvalveandliftthelevertoverifyowasinthe
followingwarnings,excerptedfromareliefvalvemanufacturer’s
warninglabel.Beforeoperatinganyreliefvalve,ensurethatit
ispipedwithitsdischargeinasafeareatoavoidseverescald
potential.ReadmanualSection4,page7,beforeproceeding
further.
SafetyreliefvalvesshouldbereinspectedATLEAST
ONCEEVERYTHREEYEARS,byalicensedplumb-
ing contractor or authorized inspection agency, to
ensurethattheproducthasnotbeenaffectedby
corrosive water conditions and to ensure that the
valve and discharge line have not been altered or
tampered with illegally. Certain naturally occurring
conditions may corrode the valve or its components
over time, rendering the valve inoperative. Such
conditions are not detectable unless the valve and its
components are physically removed and inspected.
This inspection must only be conducted by a plumb-
ing contractor or authorized inspection agency —
notbytheowner.Failuretoreinspecttheboilerrelief
valve as directed could result in unsafe pressure
buildup, which can result in severe personal injury,
death or substantial property damage.
2. Afterfollowingtheabovewarningdirections,ifthereliefvalve
weepsorwillnotseatproperly,replacethereliefvalve.Ensure
thatthereasonforreliefvalveweepingisthevalveandnot
over-pressurization of the system due to expansion tank
waterlogging or undersizing.
Following installation, the valve lever must be
operatedATLEASTONCEAYEARtoensurethat
waterways are clear. Certain naturally occurring
mineral deposits may adhere to the valve, rendering
it inoperative. When manually operating the lever,
water will discharge and precautions must be taken
to avoid contact with hot water and to avoid water
damage.Beforeoperatinglever,checktoseethat
a discharge line is connected to this valve directing
the ow of hot water from the valve to a proper
placeofdisposalotherwiseseverepersonalinjury
mayresult.Ifno waterows,valveisinoperative.
Shutdownboileruntilanewreliefvalvehasbeen
installed.
Oiled-bearing circulators
1. ThecirculatorshippedwiththeOWBand OWTboilersare
water-lubricated. No oiling is required.
2. Check other circulators in the system. Oil any circulators
requiringoil,followingcirculatormanufacturer’sinstructions.
Over-oilingwilldamagethecirculator.
Oiled-bearing burner motors
1. Theburnermayneedtobelubricatedifmotorisequipped
withoilingcups.ApplyafewdropsonlyofSAE20detergent
oil(neverusehouseholdoils).Donotattemptto“llup”the
oilcup.Over-oilingcandamagethemotor.
Verify component operation
1. Performthecheckoutsequenceonpage16toverifysystem
and components are operating correctly.
To place boiler in operation:
This manual suits for next models
1
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