Weil-McLain Ultra Oil User manual

Oil-Fired Water Boiler
®
This manual must only be used by a qualified heating installer/service technician. Read all instructions, includ-
ing this manual and all other information shipped with the boiler, before installing. Perform steps in the order
given. Failure to comply could result in severe personal injury, death or substantial property damage.
Part number 550-141-986/0112
s)NSTALLATION
s3TARTUP
s-AINTENANCE
s0ARTS
Boiler Manual

®
WATER BOILER — Boiler Manual
THE
®
WATER BOILER – HOW IT WORKS . . .
1. Weil-McLain logo plate (standard) or
Remote Display Module (optional)
The Remote Display Module (RDM) is used when the optional
AFM (item 28) is installed. The display shows boiler and system
status and is used to adjust operating parameters.
2. ON/OFF switch
3. Control Pod cover fastener
4. Pressure/Temperature gauge
Displays boiler water pressure and outlet water temperature.
5. Jacket top rear panel
6. Control Pod cover
The ®Control Pod cover is hinged to allow easy access
to the aquastat, boiler wiring and optional Advanced Features
Module (AFM).
7. Jacket side panels
®jacket side panels are interchangeable.
8. Jacket rear panel, with insulation
9. Terminal strip
Electrical connections, both line and low voltage, connect to the
terminal strip.
10. Front section
11. Intermediate sections
12. Back section
13. Burner wire harness
Line voltage wiring to burner, terminated in a Molex connector in
the jacket crosstie (item 19). An additional harness connects from
the crosstie connector to the burner.
14. Burner door hinge bracket
The hinge bracket can be installed on either side to allow for right
or left-hand swing.
15. Swing-away burner door
The ®burner door is hinged to provide easy access to the
boiler heat exchanger for inspection and cleaning.
16. Rotating observation port
The
®
observation port is designed to prevent soot from
depositing on the sight glass. During normal operation the sight
glass is located at the 12:00 position. To view the burner flame,
loosen the center mounting bolt and rotate so the sight glass is
in the 6:00 position.
17. Overfire pressure tapping
1/8” npt, with plug.
18. Jacket crosstie
19. Sensor wells
Boiler aquastat sensor and P/T gauge capillary and temperature
sensor are installed in the top of the rear section.
20. Outlet tapping
The boiler outlet water tapping is located in the top of the rear
section.
21. Return tapping
The boiler return tapping is located in the bottom of the rear
section.
22. Insulation blanket
23. Leveling legs
24. Boiler drain valve
25. Flue connection
®boilers can be chimney or direct vented from the rear
flue opening.
26. Knockouts in jacket rear for electrical conduits
All electrical connections enter in conduits connected to these
knockouts.
27. Boiler relief valve
28. AFM (Advanced Features Module) — Optional
The ®boiler can be equipped with the Advanced Features
Module (AFM). The AFM is a system control that provides boiler
outdoor reset, a boiler setpoint temperature, domestic hot water
pump operation, and outdoor reset through the use of a mixing
valve or a variable speed injection pump. It also controls staging
and rotation of two boilers.
When equipped with an AFM, the boiler requires a 20-amp
service.
29. Electronic Aquastat
The
®
boiler is equipped with a Honeywell L7248 electronic
aquastat. The L7248 senses boiler water temperature and call for
heat from the system thermostat or AFM to operate the burner
and boiler circulator.
30. "URNERWITHCOVER
31. Jacket front panel
Part number 550-141-986/0112
2

®
WATER BOILER — Boiler Manual
THE
®
WATER BOILER
Part number 550-141-986/0112 3

®
WATER BOILER — Boiler Manual
Commonwealth of Massachusetts
When the boiler is installed within the Common-
wealth of Massachusetts:
s 4HISPRODUCTMUSTBEINSTALLEDBYALICENSED
plumber.
s )FANTIFREEZEISUSEDAREDUCEDPRESSUREBACK
flow preventer device shall be used.
Contents
THE
®
WATER BOILER — HOW IT WORKS ......................... 2–3
Owners Responsibilities..................................................... 5
Please read before proceeding .......................................... 6
Boiler location checklist .................................................... 7
Prepare boiler location ....................................................... 8
Connect breeching ........................................................... 12
Connect water piping ....................................................... 14
Connect wiring (Note 1)........................................................ 18
Connect oil piping ............................................................ 22
Startup procedure ............................................................ 23
Check-out procedure ........................................................ 24
Annual service and start-up ............................................. 25
Removing/replacing boiler jacket .................................... 30
Replacement parts ............................................................. 32
Dimensions ......................................................................... 38
Ratings ................................................................................ 39
Note 1: 3EEBURNERMANUALFORWIRINGANDADDITIONALSTARTUPANDOPERATINGINFORMATION
 !LSOSEE!&-MANUALIFUSED
When calling or writing about the boiler—
Please have the boiler model number from
the boiler rating label and the CP number
from the boiler jacket. You may list the
CP number in the space provided on the
Installation Certificate found on page 24.
Consider piping and installation when
determining boiler location.
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by
the consignee.
4HETERMSBELOWAREUSEDTHROUGHOUTTHISMANUALTOBRINGATTENTIONTOTHEPRESENCEOFHAZARDSOFVARIOUSRISK
levels or to important information concerning the life of the product.
 )NDICATESPRESENCEOFHAZARDSTHATWILLCAUSE
severe personal injury, death or substantial
property damage.
 )NDICATESPRESENCEOFHAZARDSTHATCANCAUSE
severe personal injury, death or substantial
property damage.
 )NDICATESPRESENCEOF HAZARDSTHAT WILLOR
can cause minor personal injury or property
damage.
Indicates special instructions on installation,
operation or maintenance that are important
but not related to personal injury or property
damage.
Part number 550-141-986/0112
4

®
WATER BOILER — Boiler Manual
Please read before proceeding
Read all instructions —
s 2EADALLINSTRUCTIONSINCLUDINGTHISMANUALTHEBURNER
manual and any related supplements. Perform steps in
the order given. Failure to comply could result in severe
personal injury, death or substantial property damage.
When servicing boiler —
s 4OAVOIDELECTRICSHOCKDISCONNECTELECTRICALSUPPLYBEFORE
performing maintenance.
s 4OAVOIDSEVEREBURNSALLOWBOILERTOCOOLBEFOREPERFORM-
ing maintenance.
Boiler operation —
s $ONOT BLOCKmOWOFCOMBUSTIONORVENTILATIONAIRTO
burner.
s 3HOULDOVERHEATINGOCCURORFUELSUPPLYFAILTOSHUTOFFDO
not turn off or disconnect electrical supply to circulator.
Instead, shut off the fuel supply at a location external to
the appliance.
s $ONOTUSETHISBOILERIFANYPARTHASBEENUNDERWATER
Electrical and mechanical failures may cause electric
shock and fire risks. Immediately inspect chimney or vent,
boiler, burner and controls. Clean the boiler flueways and
replace all electrical and mechanical controls; all electrical
wiring; oil burner and controls; insulation and chamber
lining.
Boiler firing rate —
s $ONOTREDUCETHElRINGRATEOFTHEBOILER5SEONLYTHEOIL
NOZZLESIZESPECIlED2EDUCEDINPUTWILLCAUSECONDENSA-
tion in the boiler and vent piping.
Ceramic fiber materials —
s 4HEBOILERCONTAINSCERAMIClBERMATERIALS5SECARE
when handling these materials per instructions on
page 26 of this manual. Failure to comply could result
in severe personal injury.
Boiler water —
s 4HOROUGHLYmUSH THE SYSTEMWITHOUT BOILERCON-
nected) to remove sediment.The boiler heat exchanger
can be damaged by build-up or corrosion due to sedi-
ment.
s $ONOT USEPETROLEUMBASEDCLEANING ORSEALING
compounds in boiler system. Gaskets and seals in the
system may be damaged. This can result in substantial
property damage.
s $ONOTUSEhHOMEMADECURESvORhBOILERPATENTMEDI-
CINESv 3ERIOUS DAMAGE TOBOILERPERSONNELANDOR
property may result.
s #ONTINUAL FRESHMAKEUP WATERWILLREDUCE BOILER
life. Mineral buildup in boiler sections reduces heat
transfer, overheats the sections, and causes failure.
Addition of oxygen carried in by make-up water can
cause internal corrosion. Leaks in boiler or piping
must be repaired at once to prevent make-up water.
s $ONOTADDCOLDWATERTOHOTBOILER4HERMALSHOCK
can cause heat exchanger to crack.
Freeze protection fluids —
s 7HENUSINGANTIFREEZE$ONOTUSEAUTOMOTIVEETH-
YLENEGLYCOLUNDILUTEDORPETROLEUMBASEDANTIFREEZE
3EETHE7!2.).'ONPAGEFORMOREINFORMATION
Follow the guidelines below to prevent possible severe personal injury, death or substantial property damage.
Follow the guidelines below to prevent severe personal injury, death or substantial property damage.
Fuel
s $ONOT USECRANKCASEDRAININGSORANYOILCONTAINING
GASOLINE3EEBURNERMANUALFORPROPERFUELOIL
s .EVERBURNGARBAGEORPAPERINTHEBOILER.EVERLEAVE
combustible material around boiler.
Do not tamper with burner/controls
s !LWAYS FOLLOWSPECIlC INSTRUCTIONS WHEN STARTING UP
boiler or performing routine maintenance or service.
Do not start burner if:
s $ONOTATTEMPTTOSTARTBURNERWHENEXCESSOILHASAC-
cumulated in combustion chamber, when unit is full of
vapor, or when combustion chamber is very hot.
s $ONOTSTARTBURNERUNLESSBREECHINGANDBURNERMOUNT-
ing door are secured in place.
Part number 550-141-986/0112 5

®
WATER BOILER — Boiler Manual
(OMEOWNERRESPONSIBILITIESREADANDFOLLOWCOMPLETELY
Part number 550-141-986/0112
6
Operation Maintenance
You must adhere to the following
to avoid severe personal injury,
death or substantial property
damage.
Fuel
s $ONOTUSECRANKCASE DRAININGS OR ANYOIL
CONTAININGGASOLINE3EEBURNERMANUALFOR
proper fuel oil.
s .EVERBURNGARBAGEORPAPERINTHEBOILER
.EVERLEAVECOMBUSTIBLE MATERIAL AROUND
boiler.
Do not tamper with burner/
controls
s !LWAYSFOLLOW SPECIFIC INSTRUCTIONS WHEN
starting up boiler or performing routine
maintenance or service.
Do not start burner if:
s $ONOTATTEMPTTOSTARTBURNERWHENEXCESS
oil has accumulated in combustion chamber,
when unit is full of vapor, or when combus-
tion chamber is very hot.
s $ONOTSTART BURNER UNLESS BREECHINGAND
burner mounting door are secured in place.
Start-up
1. If burner does not fire, check and correct:
s )SBOILER /./&&SWITCHONAND AREALLOTHER SWITCHES
feeding boiler turned on?
s )SFUSEORBREAKERTRIPPED
s )STHERMOSTATSETABOVEROOMTEMPERATURE
s !REFUELVALVESTURNEDON
s )STHEREENOUGHOILINTHEOILTANK
2. If burner still does not fire, remove the burner cover and
PRESSTHEPRIMARYCONTROLRESETBUTTON/.,9/.#%
$/./4REPEATBECAUSEOILWILLBUILDUPINTHEBOILER
chamber.
The burner must never be fired when oil is
in the combustion chamber. Immediately call
you qualified service technician.
3. If the burner still does not fire, call your qualified service
technician.
Beginning of heating season
❏Call a qualified service technician to perform annual
service.
Every day during heating season
❏Keep area free of combustible materials:
Check that boiler area is free of combustible materials, gasoline
and other flammable vapors and liquids.
Every week during heating season
❏Check for and remove any obstructions to flow of combustion
or ventilation air to boiler.
❏ Check that breeching is attached between boiler and chimney.
If breeching is loose or damaged, immediately turn off boiler
/./&&SWITCHANDCALLYOURSERVICETECHNICIANTOREPAIR
❏Check for oil leaks in oil piping and around the burner. If
found, immediately call your service technician to repair.
❏Check for water leaks in boiler and piping. If found, immedi-
ately call your service technician to repair.
End of heating season
❏Perform all above daily and weekly procedures. Call your
service technician if any problems are found.
Boiler shutdown
❏ $ONOTDRAINBOILERUNLESSEXPOSURETOFREEZINGTEMPERATURES
will occur.
❏Always keep manual fuel supply shut off if burner is shut down
for an extended period of time. To do so:
 4URNOFF THE/./&& SWITCHON THEBOILER ANDANYEXTERNAL
switches feeding the boiler.
2. Close fuel valves.
3. Turn off water feed valve.
4. Cover burner to protect from dust and moisture.
Report problems
❏If you notice any unusual behavior of the boiler or system,
contact your service technician to have the problem
investigated and corrected.
1. 
 
service technician.
3. Review and understand boiler start-up and routine maintenance proce-
dures with the service technician.
4. Perform routine maintenance listed below.

®
WATER BOILER — Boiler Manual
Boiler location checklist
Before placing the boiler, verify:
❏
United States installations must
comply with all applicable U. S.
codes:
8 //+(" !+$23 3$+." + -#- 3(.- +".#$2
8  3(.- ++$"31(" +.#$
8 3 -# 1#%.1.-31.+2 -# %$37$5("$2%.143., 3(" ++7(1$#.(+$12
6'$-1$04(1$#
 - #( -(-23 ++ 3(.-2,423
".,/+76(3' ++ //+(" !+$ - 
dian codes:
8  - #( -3 -# 1#222."( 3(.--23 ++ 3(.-.#$%.1(+41-(-&04(/
ment.
8  - #( -+$"31(" +.#$ 13-$
8 //+(" !+$/1.5(-"( + -#+." +".#$2
❏.-2(#$142$.%2/ "$
8 '$!.(+$1 1$ ,423!$*$/3%1$$.%".,!423(!+$, 3$1( +2& 2.+(-$ -#.3'$1%+ ,
, !+$+(04(#2
8 '$!.(+$1,423!$(-23 ++$#2.3' 3!.(+$1 -#2723$,".,/.-$-32 1$/1.3$"3$#%1.,
#1(//(-&.12/1 7(-&6 3$1.11 (-#41(-&./$1 3(.-.12$15("$
❏.5(-&!.(+$13.+." 3(.-
8 $$, -4 +/ &$2 -#%.1!.(+$1#(,$-2(.-2 -#6$(&'32
8 %-$"$22 173'$!.(+$1) "*$3" -!$1$,.5$#(%#$2(1$#%.1' -#+(-&$$, -4 +
/ &$2 -#%.1(-2314"3(.-2
❏+$ 1 -"$2
8 1.5(#$,(-(,4,"+$ 1 -"$23.".,!423(!+$, 3$1( +2 -#%.12$15("(-&!.(+$1
8 -241$3' 33'$26(-& 6 7!41-$1#..1" -26(-&./$-%1$$+7'$'(-&$" -!$
,.4-3$#.-1(&'3.1+$%32(#$
8 $$, -4 +/ &$%.1(-2314"3(.-2.-"' -&(-&#..1'(-&$+." 3(.-
❏+..1(-& -#%.4-# 3(.-
8 1.5(#$+$5$+%+..1(-&-.-" 1/$3$#".,!423(!+$%+..1(-&(2 ""$/3 !+$(%!.(+$1+$5$+
(-&+$&2 1$(-23 ++$#
8 1.5(#$%.4-# 3(.-(%-$"$22 17
8 $$, -4 +/ &$.
❏.,!423(.- -#5$-3(+ 3(.- (1
./$-(-&2
8 .(+$11..,,423/1.5(#$ #$04 3$".,!423(.- (1 -#5$-3(+ 3(.-
8 -+$22!41-$142$2#4"3$#.432(#$ (1%.1".,!423(.-3'$!.(+$11..,,423/1.5(#$
".,!423(.- (1./$-(-&2
8 $$, -4 +/ &$.
❏$-3(-&
'(,-$75$-3(-&
8 -241$3'$5$-3/(/$" -!$1.43$#3.3'$"'(,-$7 -#3' 33'$"'(,-$7".--$"3(.-
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-#.
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(1$"35$-3(-&
8 '$+31 .(+!.(+$1" -!$#(1$"35$-3$#42(-&3'$($+#.-31.+2(1$"3$-3(3$1
(%73' 33'$5$-3/(/(-&" -!$(-23 ++$# -#1.43$#3.3'$.432(#$6 ++ 22/$"(%($#(-
3'$($+#.-31.+2(-2314"3(.-, -4 +
8 -241$3'$5$-3/(/(-&6(++/1.5(#$,(-(,4,"+$ 1 -"$22'.6-.-, -4 +/ &$.
❏723$,6 3$1/(/(-&
8 '$"*+." 3(.-.%2723$,6 3$1/(/(-&".--$"3(.-23.!$241$!.(+$1" -!$/1./$1+7
connected.
8 $$, -4 +/ &$23'1.4&'.
❏4$+24//+7 8 $$, -4 +/ &$%.11.43(-&.%%4$++(-$2
❏+$"31(" +/.6$1
8 '$!.(+$11$04(1$25 "/.6$1 -#".--$"3(.-3. 1..,3'$1,.23 3.1.3'$1
#$5("$3.(-(3( 3$" ++%.1'$ 3
8 %$04(//$#6(3' -3'$!.(+$11$04(1$2  ,/2$15("$
8 $$, -4 +/ &$23'1.4&'.
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.
 )FTHE5LTRABOILERWILLREPLACEANEXISTINGBOILERCHECKFORANDCORRECTSYSTEMPROBLEMSSUCHASs3YSTEMLEAKSCAUSING
OXYGENCORROSIONORHEATEXCHANGERCRACKSFROMHARDWATERDEPOSITSs)NCORRECTLYSIZEDEXPANSIONTANKs,ACK
OFFREEZEPROTECTIONINBOILERWATERCAUSINGSYSTEMANDBOILERTOFREEZEANDLEAK&AILURETOCORRECTSUCHCONDITIONSCOULD
result in failure of the new boiler.
Part number 550-141-986/0112 7

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WATER BOILER — Boiler Manual
Prepare boiler location
&IGURE Minimum clearances to combustible surfaces and
recommended minimum service clearances
Provide minimum clearances
From combustible materials (see Figure 1)
1. Hot water pipes
s !LLDIRECTIONSINCH
(not shown in Figure 1)
2. Double-wall vent pipe
s !LLDIRECTIONSINCHES
 3INGLEWALLVENTPIPE
s !LLDIRECTIONSINCHES
4. Boiler jacket surfaces
s 4OPOF#ONTROL0ODCOVERINCHES
s 3IDESANDBACKINCHES
5. Burner cover
s !LLDIRECTIONSINCHES
Combustible clearances always take pre-
cedence over service clearances.
For service access (see Figure 1)
If you do not provide the minimum
service clearances shown, it might not
be possible to service the boiler without
removing it from the space.
1. Recommended service clearances:
s &RONTOFBURNERCOVERINCHES
s *ACKETTOPINCHES
s *ACKETSIDESANDBACKINCHES
s "URNERDOORSWINGCLEARANCEINCHESMINIMUM
(door must swing fully open)
Part number 550-141-986/0112
8

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WATER BOILER — Boiler Manual
Air openings for combustion and
ventilation air
Adequate combustion and ventilation air
ensures proper combustion and reduces
risk of severe personal injury or death
from possible flue gas leakage and carbon
monoxide emissions.
Do not install exhaust fan in boiler
room.
Natural infiltration
/LDERBUILDINGSWITHSINGLEPANEWINDOWS MINIMAL
weather-stripping and no vapor barrier often provide
enough natural infiltration and ventilation without
dedicated openings.
Tight construction
.EW 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 code requirements
&OLLOW STATE PROVINCIALORLOCAL CODESWHENSIZING
adequate combustion and ventilation air openings. In
absence of codes, use the following guidelines when
BOILERISINACONlNEDROOMDElNEDBY.&0!AS
less than 7200 cubic feet per 1 GPH input of all appli-
ances in area. A room 8 ft. high x 33.5 ft. x 33.5 ft. is
7200 cu. ft.).
Provide two permanent openings
Provide two permanent openings — one within 12
inches of ceiling, one within 12 inches of floor. Mini-
mum height or length dimension of each rectangular
opening should be at least 3 inches.
Air from inside the building
When inside air is used — each opening must freely
connect with areas having adequate infiltration from
outside. Each opening should be at least 140 sq. in. per
1 GPH input (1 sq. in. per 1000 Btu input) of all fuel-
burning appliances plus requirements for any equip-
ment that can pull air from room (including clothes
dryer and fireplace).
Air from outside the building
When outside air is used — connect each opening
directly or by ducts to the outdoors or to crawl or at-
TICSPACETHATFREELYCONNECTSWITHOUTDOORS3IZEPER
below:
s 4HROUGHOUTSIDEWALLORVERTICALDUCTSATLEAST
sq. in. per 1 GPH input (1 sq.in. per 4000 Btu input)
of all fuel-burning appliances plus requirements for
any equipment that can pull air from room (includ-
ing clothes dryer and fireplace).
s 4HROUGHHORIZONTALDUCTSATLEASTSQINPER
GPH boiler input (1 sq. in. per 2000 Btu input) of all
fuel-burning appliances plus requirements for any
equipment that can pull air from room (including
clothes dryer and fireplace).
s 7HEREDUCTSAREUSEDTHEYSHOULDHAVESAMECROSS
sectional area as free area of openings to which they
connect. Compensate for louver, grille or screen
blockage when calculating free air openings. Refer
to their manufacturer’s instructions for details. If
unknown, use:
— Wood louvers, which provide 20-25% free air.
— Metal louvers or grilles, which provide
60-75% free air.
Lock louvers in open position or interlock with equip-
ment to prove open before boiler operation.
Flooring and foundation
Flooring
1. Install on any level, properly-supported, and non-
carpeted surface. Flooring may be combustible if
boiler leveling legs are installed.
2. Ensure the flooring is capable of handling the boiler
weight (see page 39 for weight and water volume).
Residential garage installations
Install boiler so the burner is at least 18 inches above the
floor to avoid contact with gasoline fumes.
Foundation
Provide a level concrete, masonry or cement block
foundation if the flooring could become flooded or is
NOTLEVEL3EE4ABLEFORFOUNDATIONSIZEREQUIRED
4ABLE Boiler foundation size (when req’d)
Model Length
(inches)
Width
(inches)
Height, min.
(inches)
UO-3 49 23 2
UO-4 53 23 2
UO-5 57 23 2
Prepare boiler location (continued)
Part number 550-141-986/0112 9

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WATER BOILER — Boiler Manual
Prepare boiler location (continued)
Place the boiler:
Remove outer crate
1. Remove outer crate, leaving boiler on the crate base.
2. Remove the circulator and barometric damper cartons from the crate
base.
 5/BOILERSONLY2EMOVETHETWOmUEBAFmESFASTENEDTOTHECRATE
base behind the boiler.
4. Remove the two shipping channels by loosening and removing the four
NUTS3AVETHESHIPPINGCHANNELSFORLEVELINGLEGINSTALLATION
5. Remove the jacket crosstie fastened to the crate base.
Install the leveling legs if used (required if boiler is placed on
combustible flooring)
The leveling legs must be installed if the boiler is placed on
combustible flooring.
 !SECONDPERSONOROTHERMEANSISREQUIREDTOSTABILIZETHE
boiler during leveling leg installation. Failure to do so could
result in severe personal injury or property damage.
Wear heavy leather work gloves when handling the shipping
channels in the following steps to avoid potential severe per-
sonal injury.
 &IGUREA5SEONECHANNELASALEVERTORAISETHEFRONTOFTHEBOILER
2. (Figure 2a) Insert the other channel between the boiler leg and crate
base. Place the channel directly over the crate base runner, as shown.
3. (Figure 2b) Lift the channel under the boiler leg slightly.
 &IGUREB3LIDETHEOTHERCHANNELUNDERTHEOTHERBOILERLEG0LACETHE
channel directly over the crate base runner, as shown.
5. (Figure 3) With the boiler resting securely on the two shipping chan-
NELSSCREWALEVELINGLEGINEACHBOILERLEGHOLE3CREWLEVELINGLEGSIN
completely.
 4OAVOIDPOTENTIALPERSONALINJURYORPROPERTYDAMAGE$/
./4ATTEMPTTOINSERTLEVELINGLEGSUNLESSTHEBOILERISSECURELY
seated on both shipping channels.
6. Reverse steps 2 through 4 above to remove the shipping channels. Leave
the boiler on the crate base.
7. Follow steps 2 through 6 on the back side of the boiler to install leveling
legs in the rear section legs.
8. Leave the boiler on the crate base.
Remove boiler from crate base
 "OILERSMAYBETOPHEAVY5SECAUTIONWHENHANDLINGTOAVOID
personal injury or property damage.
1. Attach the crosstie to the jacket side panels using the two screws located
in the barometric damper carton. Then remove the boiler from the crate
base.
Do not remove the boiler from the crate base without first
installing the jacket crosstie. The boiler wiring harnesses or
connectors could be damaged.
 )FNECESSARYTHEBOILERJACKETCANBEREMOVEDFORHANDLING3EEPAGES
and 31 in this manual for the jacket removal/replacement procedure.
&IGUREA To install leveling legs: Insert first
shipping channel under boiler leg.
&IGURE Inserting levelling legs
&IGUREA To install leveling legs: Insert second
shipping channel under other leg.
Part number 550-141-986/0112
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WATER BOILER — Boiler Manual
Perform hydrostatic pressure test:
3EEPAGESANDFORBOILERFEATURELOCATIONS
1. Install air vent in relief valve tapping.
2. Plug supply and return tappings.
3. Install the boiler drain valve shipped with boiler.
4. Fill boiler.
5. Vent all air.
 0RESSURETESTBOILERATTIMESWORKING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.
7. Check for maintained gauge pressure for at least 10 minutes. Visually
check for leaks if gauge pressure drops.
8. Drain boiler. Repair leaks if found.
Do not use petroleum-based sealing compounds to repair
leaks. Damage to system components can result, causing
property damage.
9. Retest boiler after repairing leaks.
10. Remove air vent and plugs. Reinstall relief valve.
Boiler preparation
Changing door hinge
The boiler is shipped with the burner door hinged on the left side. The hinge
BRACKETCANBERELOCATEDTOTHERIGHTSIDEIFDESIRED3EE&IGURE
1. Remove jacket front panel.
2. Remove and retain burner door screws and washers used to fasten the
burner door to the front section (one on each side of door).
3. Carefully lift the burner door so the door pins lift out of the hinge
bracket.
 3ETTHEBURNERDOORASIDETEMPORARILY
The burner door is heavy. Handle carefully to avoid potential
for personal injury.
Do not damage the burner door insulation when handling.
5. The hinge bracket has keyhole slots. Loosen the two screws securing
the hinge bracket to the front section. Remove the hinge bracket.
6. Loosen the two screws on the opposite side. Place the hinge bracket on
that side and tighten the two screws to secure the bracket. Also tighten
the two screws on the other side.
7. Carefully lift the burner door and position so the door pins slide into
THEHINGEBRACKETHOLES4HELOWERPINISLONGERTHANTHEUPPER3OALIGN
the lower pin, then the upper.
8. Replace burner door screws and washers used to fasten the burner door
to the front section (one on each side of door).
Flue baffles —
UO-3 ONLY – 1.0 GPH firing rate ONLY
/N5/BOILERSlREDAT'0(ONLY, install the two mUEBAFmES sup-
PLIEDWITHTHEBOILER3EEPAGEFORLOCATION
Burner door screws and washers
Hinge bracket and screws
(factory-installed on left side)
UO010
&IGURE Burner door hinge installation
Prepare boiler location (continued)
 $/./4INSTALLBAFmESON5/BOILERS
fired at 0.8 GPH. Flue gas condensation
will result, causing corrosion damage to
boiler and vent system.
Combustion chamber floor blanket —
All Direct Vent and UO-3 – 0.8 GPH firing rate
Place the CERAMIClBERmOORBLANKET on the floor
of the combustion chamber. The blanket and instruc-
TIONSARESUPPLIEDINTHE5/LOWlRINGRATEKITFOR
the 0.8 GPH boiler or supplied with the burner for
DIRECTVENT3EEPAGEFORLOCATION
If the boiler has flue baffles installed, you
must remove the baffles before changing
to the low firing rate. Flue gas condensa-
tion will result, causing corrosion damage
to boiler and vent system.
Check chamber and burner door
1. Check for secure placement of insulation on burner
door.
2. All Direct Vent and UO-3, 0.8 GPH firing rate —
Check for secure placement of combustion chamber
floor blanket.
3. Visually check burner mounting door seal.
Verify gas-tight seal to prevent possible
flue gas leakage and carbon monoxide
emissions, which can lead to severe per-
sonal injury or death.
Part number 550-141-986/0112 11

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WATER BOILER — Boiler Manual
Connect breeching
Direct venting
4HE5LTRA/ILBOILERCANBEDIRECTVENTEDUSINGTHE&IELD
#ONTROLS$IRECT6ENT+ITMODELNUMBER&$63AND
VENTPIPEMODELNUMBER&6/06ENTLENGTHSARE
limited to 15 feet. Air intake lengths are limited to 22
feet of rigid 4-inch pipe. Do not use flexible dryer vent.
Refer to instructions provided with the vent kit for vent
and air piping installation procedures.
Direct venting is allowed only with
"ECKETT.8AND2IELLO"&BURNERS
Chimney venting
General chimney requirements:
4HE5LTRA/ILBOILERISDESIGNEDFORNATURALDRAFTlRING
s .&0!REQUIRESCHIMNEYTOBELINEDBEFORECON-
necting to boiler.
To prevent downdrafts, extend chimney at least 3 feet
above highest point where it passes through roof and 2
feet higher than any portion of building within 10 feet.
Increase chimney cross-sectional area and height at least
4% per 1,000 feet above sea level.
s -INIMUMCLEARANCESFROMVENTPIPETOCOMBUSTIBLE
material:
 s4YPEh,vDOUBLEWALLVENT INCHES
 s3INGLEWALLVENT  INCHES
s -INIMUMCHIMNEYSIZESSHOULDBEUSED
 /VERSIZED CHIMNEYSOUTSIDE MASONRY
chimneys and/or derated inputs can result
in condensation in chimney.
4ABLE Chimney venting — vent sizing
Model
Minimum
breeching
diameter
(inches)
Minimum I=B=R
chimney size
(inches)
Minimum
chimney
height
(feet)
Rect. Round
UO-3 58 x 8
(6¾ x 6¾
liner)
615UO-4 6
UO-5 6
Note: boiler flue connection is 6-inch diameter
Install the burner
 3ECURETHEBURNERmANGETOTHEBURNERDOORUSING
the three bolts provided.
2. Check for secure placement of insulation and sealing
rope on the burner door.
Prepare boiler location (continued)
3. Close the burner door and secure in place with the
burner door screws and washers.
4. Follow the burner manual and boiler manual
(pages 20 to 22) to wire the burner and connect fuel
lines.
s 5SEVENTMATERIALAPPROVEDBYLOCALCODESFOROIL
fired burners. In their absence, refer to:
s .&0!)NSTALLATIONOF/IL"URNING%QUIPMENT
s .&0!3TANDARDFOR#HIMNEYS&IREPLACES
 6ENTSAND3OLID&UEL"URNING!PPLIANCES
s )N#ANADAREFERTO#3!")NSTALLATION
 #ODEFOR/IL"URNING%QUIPMENT
Connect boiler to vertical chimney.
Insufficient draft can cause flue gas
leakage and carbon monoxide emis-
sions, which will lead to severe personal
injury or death.
Inspect existing chimney before install-
ing new boiler. Failure to do any of the
following will result in severe personal
injury or death:
s #LEANCHIMNEYINCLUDINGREMOVALOF
blockage.
s 2EPAIRORREPLACEDAMAGEDPIPEORLINER
s 2EPAIRMORTARANDJOINTS
Part number 550-141-986/0112
12

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WATER BOILER — Boiler Manual
Connect breeching (continued)
&IGURE Breech connection, typical, for gravity venting into chimney
UO011
Typical locations for barometric
draft control (also see draft
control manufacturer's instructions)
Chimney venting (continued)
Connect breeching:
 ,ONGHORIZONTALBREECHINGS EXCESSIVE
number of tees and elbows or other ob-
structions restricting combustion gas flow
can result in possibility of condensation,
flue gas leakage and carbon monoxide
emissions, which can lead to severe per-
sonal injury or death.
 #ONNECTFULLSIZED BREECHINGWHEN POSSIBLE3EE
Table 2, page 12, and Figure 5, below.
2. Connection must be made above bottom of chimney
to avoid blockage. Breeching must not enter chim-
NEYFARENOUGHTOCAUSEOBSTRUCTION5SETHIMBLEOR
slip joint where breeching enters chimney to allow
removal for cleaning.
3. When burner and boiler are properly installed,
breeching draft will be approximately -0.01” to
-0.02” W.C. Install barometric control in breech-
ing, per control manufacturer’s instructions, when
excess draft needs to be relieved or to comply with
APPLICABLECODESANDREGULATIONS5SEDRAFTGAUGETO
adjust proper opening.
 4HE5LTRA/ILBOILERISCAPABLEOFBEING
PRESSURElRED/VERlREPRESSUREMAYBE
positive even with a negative pressure
INTHECHIMNEY3EETHE2ATINGSTABLEON
page 39 for boiler draft loss.
The pressure in the breeching and chim-
ney must always be negative unless the
chimney and breeching are constructed
OF VENTPIPING DESIGNED FOR PRESSURIZED
venting.
4. An induced draft fan for the chimney may be neces-
sary if:
s %XCESSIVERESISTANCETOFLOWOFCOMBUSTIONGASESCAN
be expected.
s #ROSSSECTIONALAREAOFCHIMNEYISSMALLERTHANMINI-
mum recommended.
s #HIMNEYHEIGHTISLESSTHANRECOMMENDED
5. When using an induced draft fan:
s 3EALALLVENTJOINTS
s )NTERLOCKBURNERWITHFANOPERATION
Part number 550-141-986/0112 13

®
WATER BOILER — Boiler Manual
General piping information:
ASME or Canadian requirements
s )FINSTALLATIONISTOCOMPLYWITH!3-%OR#ANADIAN
requirements, an additional high temperature limit
is needed. Install control in supply piping between
BOILERANDISOLATIONVALVE3ETCONTROLTOAMINIMUM
of 20 °F above set point of the boiler aquastat. Maxi-
mum allowable set point is 220 °F. Wire control as
shown on wiring diagram (page 21).
Low water cutoff devices
s 5SEALOWWATERCUTOFFDEVICEWHEN
s "OILERISINSTALLEDABOVERADIATIONLEVEL
s 2EQUIREDBYCERTAINSTATEORLOCALCODESORINSURANCE
companies.
s 5SEALOWWATERCUTOFFDESIGNEDFORWATERINSTALLA-
tions.
s 0ROBETYPEISRECOMMENDED
s 0URCHASEANDINSTALL INTEEIN SUPPLY LINEABOVE
boiler. Wire per wiring diagram, page 21.
Backflow prevention
s 5SEBACKmOWCHECKVALVEINCOLDWATERSUPPLYAS
required by local codes.
Install piping:
Pipe sizing
s 3EE4ABLEFORPIPESIZINGFORNEARBOILERPIPINGAND
SINGLEZONEPIPING
Near-boiler piping
(with diaphragm expansion tank)
s 3EE&IGUREPAGE
Near-boiler piping
(with closed expansion tank)
s 3EE&IGUREPAGE
Multiple-zone piping
s 3EEPAGE
Low-temperature system piping
s 3EEPAGE
Chiller system piping
s 3EEPAGE
For multiple-boiler piping
s 2EFERTO7EIL-C,AINSh0RIMARY3ECONDARY0IPING
Guide.”
Relief valve
s )NSTALLRELIEFVALVEVERTICALLYINELBOWSUPPLIED3EE
Figure 6 or 7 for location.
s 3EE7!2.).'ATRIGHT
s !LSOREFERTOTAGATTACHEDTORELIEFVALVEFORMANU-
facturer’s instructions.
2ELIEFVALVEDISCHARGEPIPING
To avoid water damage or scalding
due to relief valve operation:
s $ISCHARGELINEMUST BECONNECTED TO
relief valve outlet and run to a safe place
of disposal. Terminate the discharge
line to eliminate possibility of severe
burns should the valve discharge.
s $ISCHARGELINEMUSTBEASSHORTASPOS-
SIBLEANDBETHESAMESIZEASTHEVALVE
discharge connection throughout its
entire length.
s $ISCHARGELINEMUST PITCHDOWNWARD
from the valve and terminate at least
6” above the floor drain where any
discharge will be clearly visible.
s 4HE DISCHARGELINE SHALL TERMINATE
plain, not threaded, with a material
serviceable for temperatures of 375 °F
or greater.
s $ONOTPIPETHEDISCHARGETOANYPLACE
WHEREFREEZINGCOULDOCCUR
s .OSHUTOFFVALVESHALLBEINSTALLEDBE-
tween the relief valve and boiler, or in
the discharge line. Do not plug or place
any obstruction in the discharge line.
s &AILURETOCOMPLYWITHTHEABOVEGUIDE-
lines could result in failure of the relief
valve to operate, resulting in possibil-
ity of severe personal injury, death or
substantial property damage.
s 4ESTTHEOPERATIONOFTHEVALVEAFTER
FILLINGANDPRESSURIZING SYSTEMBY
lifting the lever. Make sure the valve
discharges freely. If the valve fails to
operate correctly, replace it with a new
relief valve.
Connect water piping
4ABLE Water piping sizing
Model
Piping to
system
(inches)
Piping from
system
(inches)
UO-3 1¼ 1¼
UO-4 1¼ 1¼
UO-5 1½ 1½
Note: sizing based on 20°F temperature rise through boiler.
Part number 550-141-986/0112
14

®
WATER BOILER — Boiler Manual
Connect water piping (continued)
DIAPHRAGM expansion tank (Figure 6)
s -AKESUREEXPANSIONTANKSIZEWILLHANDLEBOILERAND
system water volume and temperature. Tank must
BELOCATEDNEARBOILERBEFOREINLETTOCIRCULATOR3EE
tank manufacturer’s instructions for details.
 5NDERSIZEDEXPANSIONTANKSCAUSESYSTEM
water to be lost from relief valve and
makeup water added through fill valve.
Eventual section failure can result.
CLOSED expansion tank (Figure 7)
s %NSUREEXPANSIONTANKSIZEWILLHANDLEBOILERAND
system water volume and temperature.
 5NDERSIZEDEXPANSIONTANKSCAUSESYSTEM
water to be lost from relief valve and
makeup water added through fill valve.
Eventual section failure can result.
s 0ITCHANYHORIZONTALPIPINGUPTOWARDSTANKINCH
per 5 feet of piping.
&IGURE Near-boiler piping, with diaphragm expansion tank
&IGURE Near-boiler piping, with closed expansion tank
Part number 550-141-986/0112 15

®
WATER BOILER — Boiler Manual
Connect water piping (continued)
Piping MULTIPLE ZONES — System temperature 140 °F or higher
1. Follow instructions on page 14 and 15 to install
piping near boiler.
2. Zoning with circulators (Figure 8)
A 3IZE EACHCIRCULATORTOINDIVIDUAL CIRCUITREQUIRE-
ments.
b. Remove circulator (when furnished as standard equip-
ment).
c. Install balancing valves to adjust flow to distribute heat
TOALLZONES
&IGURE Multiple zoning with circulators –
Temperatures 140 °F and higher
&IGURE Multiple zoning with zone valves –
Temperatures 140 °F and higher
D 3EPARATERELAYISREQUIREDFOREACHCIRCULATOR
 :ONINGWITHZONEVALVES&IGURE
a. Install balancing valves to adjust flow to distribute
HEATTOALLZONES
B 3EPARATETRANSFORMERISREQUIREDTOPOWERZONEVALVES
2EFERTOh7EIL-C,AIN:ONE6ALVE7IRING
Guide” for details.
Zone 1
Zone 2
11
4
1
5
1
5
UO015
3
Zone 1
Zone 2
11
2
23
1
5
1
5
UO014
1 Isolation valve
2 Flow control valve
3 Circulator
4 Zone valve
5 Drain valve
Part number 550-141-986/0112
16

®
WATER BOILER — Boiler Manual
Connect water piping (continued)
&IGURE Multiple zoning with zone valves –
Temperatures below 140 °F
&IGURE Multiple zoning with circulators –
Temperatures below 140 °F
1. If system water temperature requirements are less
than 140 °F, such as radiant panels or converted
gravity systems, use piping as shown in Figure 10
or 11.
2. If system piping is plastic without an oxygen barrier,
a heat exchanger must be used.
3. Follow instructions on page 14 and 15 to install
near-boiler piping.
4. Zoning with circulators (Figure 10)
A 3IZE EACHCIRCULATORTOINDIVIDUAL CIRCUITREQUIRE-
ments.
b. Remove circulator (when furnished as standard equip-
ment).
c. Install balancing valves to adjust flow to distribute heat
TOALLZONES
D 3EPARATERELAYISREQUIREDFOREACHCIRCULATOR
 :ONINGWITHZONEVALVES&IGURE
a. Install balancing valves to adjust flow to distribute heat
TOALLZONES
B 3EPARATETRANSFORMERISREQUIREDTOPOWERZONEVALVES
2EFERTOh7EIL-C,AIN:ONE6ALVE7IRING
Guide” for details.
6. To set the valves, A and B:
A 3ETTHEVALVESWHILETHESYSTEMISCOOLSETTINGFORTHE
coldest expected water temperature (usually 60 °F
since the system will often drop to room temperature
between cycles).
B 3TARTWITHVALVEA fully closed and B fully open.
c. Gradually open valve A while closing B until the
temperature at gauge reads 130 °F when gauge A
reads 60 °F.
D .OTETHATVALVEA regulates the amount of hot water
from the boiler supply, which mixes with return water.
Valve B regulates the amount of system water flowing
through the boiler secondary loop.
Piping MULTIPLE ZONES — System temperature below 140 °F
Zone 1
Zone 2
11
11
2
23
4b4a
66
7b
7a
8
Max.
12”
UO016
3
1 Isolation valve
2 Flow control valve
3 Circulator
4 System temperature gauges
5 Zone valve
6 Drain valve
7 System temperature valves. Adjust valves
8 Blend temperature gauge
9 Boiler temperature gauge (not shown)
Part number 550-141-986/0112 17

®
WATER BOILER — Boiler Manual
Connect water piping
Piping boiler in refrigeration systems
(Figure 12)
s )NSTALLBOILERSOTHATCHILLEDMEDIUMISPIPEDINPARALLELWITH
HEATINGBOILER5SEAPPROPRIATEVALVESTOPREVENTCHILLEDME-
dium from entering boiler. Consult I=B=R Installation and
Piping Guides.
s )FBOILERISCONNECTEDTOHEATINGCOILSLOCATEDINAIRHANDLING
units where they can be exposed to refrigerated air, use flow
control valves or other automatic means to prevent gravity
circulation during cooling cycle.
&IGURE Piping boiler in a system with chiller
General wiring requirements
%LECTRICSHOCKHAZARD. Can cause severe personal
injury or death if power source, including service
switch on boiler, is not disconnected before install-
ing or servicing.
Installations must follow these codes:
s 5NITED3TATES
 .ATIONAL%LECTRICAL#ODE!.3).&0!LATESTEDITIONAND
any additional national, state or local codes.
s #ANADA
 #3!##ANADIAN %LECTRICAL #ODE0ART  ANDANYLOCAL
codes.
Electrical
knockouts
Terminal strip
Control Pod cover
UO018
Remove cover for
unrestricted access to
wiring compartment.
Conduits,
typical
&IGURE Terminal strip access
Connect wiring
Wire requirements
s 7IRINGMUSTBE.%##LASS
s )FORIGINALWIRESUPPLIEDWITHBOILERMUSTBEREPLACEDTYPE
105 °C wire or equivalent must be used.
s 3UPPLYWIRING
s "OILERONLYGAUGEORHEAVIER
s "OILERWITHOPTIONAL!&-GAUGEORHEAVIER
Electrical requirements
s "OILERSNOTEQUIPPEDWITHAN!&-CANBESUPPLIEDBYA
amp service.
s "OILERSEQUIPPEDWITHAN!&-REQUIREAAMPSERVICE
Electrical grounding
s 0ROVIDEELECTRICALGROUNDATBOILERASREQUIREDBYCODES
Wiring entrances (see Figure 13)
Terminal strip access
s 2EMOVETHETWORETAINERSCREWSINTHEJACKETTOPPANELATREAR
of the boiler) and remove the jacket top panel.
s 2ELEASETHE#ONTROL0ODCOVERBYLOOSENINGTHERETAINERSCREW
INTHETOPCENTEROFTHECOVER3WINGTHECOVEROPENTOREVEAL
the boiler terminal strip.
(continued)
Connect wiring
Part number 550-141-986/0112
18

®
WATER BOILER — Boiler Manual
Connect wiring
s 2EMOVETHE#ONTROL0ODCOVERTOFACILITATEWIREROUTING4O
remove, push the Control Pod cover to one side, and gently
work the cover retainer hinge on the other side out of the
jacket slot.)
120-volt wiring
Conduits
s #ONNECTEACH CONDUITSUPPLYINGLINEVOLTAGE WIRING TOOR
from the boiler to a conduit opening in the upper portion of
the jacket rear panel.
s !LLlELDPROVIDED LINEVOLTAGEWIRING MUSTBESHEATHEDIN
flexible metal conduit.
Additional limits
s )FREQUIREDBYSTATEORLOCALCODESPROVIDEADDITIONALLIMITS
as needed.
s 7HEN USINGADDITIONAL LIMITS REMOVETHEFACTORYINSTALLED
jumper between boiler terminal strip terminals 19 and 20.
s #ONNECTTHE ADDITIONAL LIMITSINSERIES ANDWIRETO BOILER
terminal strip terminals 19 and 20.
Circulator
s The circulator is shipped with the boiler, but not installed or
wired.
s 7IRETHECIRCULATORTOTHEBOILERTERMINALSTRIPASSHOWNON
the boiler wiring diagram. Provide hot, neutral and ground
wires, routed in metal conduit.
Thermostat wiring
s Install thermostat on inside wall away from influences of
drafts, hot or cold water pipes, lighting fixtures, televisions,
sun rays or fireplaces.
s &OLLOWINSTRUCTIONSWITHTHERMOSTAT
s )FTHETHERMOSTATHASAHEATANTICIPATORSETTHEHEATANTICIPATOR
per the limit control manufacturer’s recommendation.
Burner wiring (see Figure 14)
s The burner harnesses incorporate disconnect plugs, providing
a convenient way to disconnect wiring when burner mounting
door is opened.
Failure to disconnect the burner wiring harness
before opening the burner door can cause damage
to the burner and boiler wiring.
Optional AFM installation
s 3EESEPARATE!&-INSTRUCTIONSWHENUSED
When wiring is completed:
s Reinstall the Control Pod cover, close cover and tighten the
retainer screw.
s 2EPLACEJACKETTOPANDSECUREWITHSCREWS
&IGURE Burner harness routing
UO020
Power harness
Power harness, burner to crosstie
J
acket crosstie
See detail below
Part number 550-141-986/0112 19

®
WATER BOILER — Boiler Manual
Connect wiring (continued)
&IGURE Boiler and burner wiring, standard equipment This wiring diagram is for standard boiler
equipment. For wiring with optional AFM,
see AFM instructions.
REMOTE
DISPLAY
MODULE
SETPOINT
DEMAND
DHW
DEMAND
MIX
DEMAND
BOILER
DEMAND
REMOTE ALARM
(DRY CONTACTS)
DHW
PUMP
MIX
PUMP
PRIMARY
PUMP
SEE AFM INSTALLATION INSTRUCTIONS FOR
APPLICATION SPECIFIC WIRING
BOILER
2
M
N
MIXING VALVE
VARIABLE SPEED
PUMP
- OR -
ALERT OUTPUT
FROM LWCO OFF BOILER 2
OUTDOOR
SENSOR
MIX SUPPLY
SENSOR
BOILER
SUPPLY
SENSOR
1 2
3 4
5
6 7
8 9
10 11 12 13 14 15 16 17 18 19
ADVANCED FEATURES MODULE
20 21
22 23
24
25 26
27 28
29 30 32 31
(OPTIONAL EQUIPMENT)
27 28
29 30
27 28
29 30
HH
120 VAC FIELD WIRING
LOW VOLTAGE FACTORY WIRING
120 VAC FACTORY WIRING
LOW VOLTAGE FIELD WIRING
ADVANCED FEATURES MODULE - OR - THERMOSTAT (NOTE 7)
G
R
W
COMBINATION
HIGH LIMIT, RELAY
AND TRANSFORMER
T
T3
2
1
C2
B2
C1
B1
L2
L1
BOILER WIRING
BK
G
120 VAC
(NOTE 3)
ON/OFF
SWITCH
FIELD WIRING
GND
NEUTRAL
HOT
R
BOILER
PUMP
6 7
8 9
10 11 12 13 14 15 16 17 18 19
Y
R
W
BK
GBK
TEMPERATURE
LIMIT CONTROL
ADDITIONAL LIMITS
(IF REQUIRED - NOTE 5)
ALERT
G
BLOCKED VENT
SHUTOFF SWITCH
(CANADA ONLY)
LOW
WATER
CUT-OFF
H
N
G
N
H
JUMPER
(NOTE 5)
LIMIT
SENSOR
(NOTE 8)
BK
BURNER DISCONNECTS
Wiring Diagram
®
NOTES:
1. All wiring must be installed in accordance with N.E.C. and any other national, state, or local code requirements.
For Canadian installations, all wiring must comply with the Canadian Electrical Code.
2. All wiring must be N.E.C. Class 1.
3. Electrical Service:
Boiler only - requires 15 amp service
Boiler with optional AFM - requires 20 amp service.
4. If any original wire as supplied with boiler must be replaced, use minimum 105° C wire of same gage.
5. Connect additional limits (if required) between terminals 18 and 19. Remove factory jumper.
6
. Refer to control component instructions packed with the boiler for application information.
7. Set thermostat heat anticipator as per control manufacturer’s recommendation.
8. Install limit sensor in well with clip.
9. See Advanced Features Module Installation Instructions for application for specific wiring.
Weil-McLain 500 Blaine St. Michigan City, IN 46360-2388
PART NUMBER ULTO-E008-B/0112
NOTICE
Burners with Beckett Clean Cut Pump must be used with a
primary control that has a valve-on delay (pre-purge).
Controls shown have valve on delay (see control
Electrical shock hazard — can cause severe injury or death.
WARNING
Part number 550-141-986/0112
20