Beckett NX User manual

RWB 6104 BNX Page 1
To the Professional, Qualified Installer or Ser-
vice Agency:
Please read and carefully follow all instructions
provided in this manual before installing, starting,
or servicing this burner or heating system.
The Installation must be made in accordance with
all state and local codes having jurisdiction.
•
•
RESIDENTIAL BURNERS
Potential for Fire, Smoke and Asphyxiation Hazards
To the Homeowner or Equipment Owner:
Please read and carefully follow all instructions
provided in this manual regarding your respon-
sibilities in caring for your heating equipment.
Contact a professional, qualified service agency
for installation, start-up or service work.
Save this manual for future reference.
•
•
•
Incorrect installation, adjustment, or misuse of this burner could result in death, severe personal
injury, or substantial property damage.
NX
NX
Oil Burner Manual
Oil Burner Manual
CLICK ANYWHERE on THIS PAGE to
RETURN to BECKETT BURNERS &
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Page 2 RWB 6104 BNX

RWB 6104 BNX Page 3
Table of Contents
General Information
Hazard Definitions........................................................................................................................................4
Information To Be Used Only By Qualified Service Technicians
General Information.........................................................................................................................................4
Notice Special Requirements...........................................................................................................................5
General Specifications………………………………………………………….. ....................................................5
Inspect/Prepare Installation Site.................................................................................................................6
Inspect Chimney or Direct Vent System .........................................................................................................6
Combustion Air Supply.....................................................................................................................................7
Direct Air Supply & Sidewall Venting .............................................................................................................7
Prepare the Burner...........................................................................................................................................8
General .........................................................................................................................................................8
Low Fire Rate Baffle (if specified)....................................................................................................................8
Mount Burner on Appliance .............................................................................................................................8
Connect Fuel Lines...........................................................................................................................................9
Fuel Line Installation.........................................................................................................................................9
Fuel Line Valves and Filters .............................................................................................................................9
Fuel Supply Level with or Above Burner ........................................................................................................9
Fuel Line Below Level of Burner....................................................................................................................10
Fuel Line Installation.......................................................................................................................................10
Wire Burner .......................................................................................................................................................10
Wiring Connection Diagram...........................................................................................................................11
GeniSys Model 7505 Control..........................................................................................................................12
Typical Burner Sequence of Operation.........................................................................................................12
Start the Burner and Set Combustion....................................................................................................15
Start-up and Initial Settings............................................................................................................................15
Set Combustion with Test Instruments.........................................................................................................17
Cover Installation............................................................................................................................................17
Trained Service Technician’s Regular Maintenance.........................................................................18
Removing Nozzle Line for Service.................................................................................................................19
Nozzle Installation...........................................................................................................................................19
Check/Adjust Electrodes................................................................................................................................20
Check Retention Head Alignment and Cad Cell Sighting............................................................................20
Check/Adjust “Zero” Calibration...................................................................................................................21
Blower Wheel Replacement ...........................................................................................................................21
Replacement Parts Diagram.......................................................................................................................22
Replacement Parts Diagram...........................................................................................................................22
Replacement Parts List...................................................................................................................................23
Beckett Limited Warranty Information...................................................................................................24

Page 4 RWB 6104 BNX
Hazard Definitions
Owner’s Responsibility
Contact a professional, qualified service agency for the
installation, adjustment and service of your oil heating
system. This work requires technical training, trade ex-
perience, licensing or certification in some states and the
proper use of special combustion test instruments.
Please carefully read and comply with the following in-
structions:
Never store or use gasoline or other flammable
liquids or vapors near this burner or appliance.
Never attempt to burn garbage or refuse in this
appliance.
Never attempt to light the burner/appliance by
throwing burning material into the appliance.
Never attempt to burn any fuel not specified and
approved for use in this burner.
Never restrict the air inlet openings to the burner
or the combustion air ventilation openings in the
room.
•
•
•
•
•
Incorrect installation, adjustment,
and use of this burner could result in
severe personal injury, death, or sub-
stantial property damage from fire,
carbon monoxide poisoning, soot or explosion.
WARNING
!
Within the boundaries of the hazard warning, there will
be information presented describing consequences if the
warning is not heeded and instructions on how to avoid
the hazard.
NOTICE Intended to bring special attention to
information, but not related to personal injury or property
damage.
Indicates a hazardous situ-
ation, which, if not avoided,
will result in death or serious injury.
DANGER
!
!
Indicates a hazardous
situation, which, if not
avoided, could result in death or serious
injury.
WARNING
!
Indicates a hazardous
situation, which, if not
avoided, could result in minor or moderate
injury.
!
!CAUTION
General Information
Figure 1. Burner label location
If the residence is unattended in severely cold
weather, burner primary control safety lockout,
heating system component failures, power
outages or other electrical system failures
could result in frozen plumbing and water
damage in a matter of hours. For protection,
take preventive actions such as having a
security system installed that operates during
power outages, senses low temperature and
initiates an effective action. Consult with your
heating contractor or a home security agency.
Frozen Plumbing and
Water Damage Hazard
General Information

RWB 6104 BNX Page 5
To the Owner:
Thank you for purchasing a Beckett burner for use
with your heating appliance. Please pay attention
to the Safety Warnings contained within this instruc-
tion manual. READ THIS MANUAL AND SAVE FOR
YOUR RECORDS. Provide it to your qualified service
agency for use in professionally setting up and main-
taining your oil burner.
Your Beckett burner will provide years of efficient op-
eration if it is professionally installed and maintained
by a qualified service technician. If at any time the
burner does not appear to be operating properly, im-
mediately contact your qualified service agency
for consultation.
We recommend annual inspection/service of your
oil heating system by a qualified service agency.
Daily – Check the room in which your burner/appli-
ance is installed. Make sure:
Air ventilation openings are clean and unobstruct-
ed
Nothing is blocking burner inlet air openings
No combustible materials are stored near the heat-
ing appliance
There are no signs of oil or water leaking around
the burner or appliance
Weekly
Check your oil tank level. Always keep your oil tank
full, especially during the summer, in order to pre-
vent condensation of moisture on the inside surface
of the tank.
•
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•
•
•
Notice Special Requirements
THE INSTALLATION OF A BURNER SHALL BE
IN ACCORDANCE WITH THE REGULATIONS
OF AUTHORITIES HAVING JURISDICTION.
For recommended installation practices in the
U.S. refer to the latest edition of NFPA 31. (CSA-
B139 and CSA-B140 in Canada.
Concealed damage — If you discover damage
to the burner or controls during unpacking, notify
the carrier at once and file the appropriate claim.
When contacting Beckett for service information
— Please record the burner serial number (and
have available when calling or writing). You will
find the serial number on the silver label located
on the left rear of the burner. Refer to Figure 1.
•
•
•
•
•
General Specifications
Table 1 – Burner Specifications
Capacity
(Note 1)
Firing rate: - 0.40 – 1.75 GPH
Input: Min. - 56,000 Btu
Max - 245,000 Btu
Certification/
Approvals
UL certified to comply with ANSI/UL296 &
tested to CSA B140.0
Fuels U. S: No. 1 or No. 2 heating oil only (ASTM D396)
Canada: No. 1 stove oil or No. 2 furnace oil only
!
!CAUTION
DO NOT USE GASOLINE, CRANKCASE OIL,
OR ANY OIL CONTAINING GASOLINE.
Electrical Power supply - 120 volts AC, 60 Hz, single
phase
Operating load - 5.8 Amps max
Motor - 1/7 hp, 3450 rpm, NEMA 48M
frame PSC rotation CCW when
facing shaft end
Ignition - Continuous duty solid-state igniter
Fuel pump Outlet pressure - Note 2
Air tube ATC code - See Table 2
Dimensions
(with cover)
Height (maximum) - 12-1/2 inches
Width (maximum) - 15 inches
Depth - 9-1/4 inches
Air tube diameter - 3-1/4 inches
Ambient Operat-
ing Temperature +32oF. (0 C.) Minimum +115oF. (+46 C.) Maximum
(See above Warning)
Moisture 5% to 95% RH, non-condensing and non-crystallizing
Note 1: Approval agency listed rating for these burners is 0.40 to
1.75 gph. However, the firing rate range is limited by the
specific air tube combination being used. Refer to Table 2.
Note 2. See appliance manufacturer’s burner specifications for
recommended pump discharge pressure.
Table 2 – Air Tube Combinations (ATC)
Firing rate
(gph)
Head ATC codes for usable air tube
lengths:
(min-max) 5” 7” 9”
0.40-1.00 9-Slot NX50LG NX70LG NX90LG
0.40-1.00 6-Slot NX50LH NX50LH NX90LH
0.40-1.35 9-Slot NX50LB NX70LB NX90LB
0.40-1.35 6-Slot NX50LC NX70LC NX90LC
1.10-1.75 9-Slot NX50LD NX70LD NX90LD
1.10-1.75 6-Slot NX50LF NX70LF NX90LF
General Information
Impaired Burner Perfor-
mance and Fire Hazard.
WARNING
!
Do NOT operate the burner beyond specifica-
tions outlined in the following Table.
For applications beyond these limits, consult
Beckett Technical Service at 1-800-645-2876.
NOTE: Some packaged appliances with burners
may be agency listed as a unit to operate beyond
these limits. Consult the appliance manufacturer’s
specifications and agency approvals for verifica-
tion.
•
•

Page 6 RWB 6104 BNX
Please read and understand the manual supplied with
this equipment. This equipment must be installed, adjust-
ed and put into operation only by a qualified individual or
service agency that is:
Licensed or certified to install and provide technical
service to oil heating systems.
Experienced with all applicable codes, standards and
ordinances.
Responsible for the correct installation and commis-
sion of this equipment.
Skilled in the adjustment of oil burners using combus-
tion test instruments.
The installation must strictly comply with all applicable
codes, authorities having jurisdiction and the latest revi-
sion of the National Fire Protection Association Standard
for the installation of Oil-burning Equipment, NFPA 31 (or
CSA B139 and B140 in Canada).
Regulation by these authorities take precedence over the
general instructions provided in this installation manual.
•
•
•
•
Incorrect installation, adjustment,
and use of this burner could result
in severe personal injury, death, or
substantial property damage from
Professional Service
Required
fire, carbon monoxide poisoning, soot or explo-
sion.
WARNING
!
Inspect/Prepare Installation Site Inspect Chimney or Direct Vent System•
Starting with minimum gph firing rate, the minimum
size recommended is 6” flue pipe with 8” X 8” inside
chimney, unless specified otherwise by the appli-
ance manufacturer.
A chimney flue shall extend at least 3 feet above
the highest point at which the chimney comes
in contact with the roof, and not less than 2 feet
above the highest roof surface or structure within
10 feet horizontally of the chimney. Refer to
Figure 2.
Any accumulation of soot or debris in chimney
offsets should be removed
Any obstructions such as a protruding joint or
a piece of broken tile wedged in the chimney
should be removed.
No other appliance connection should be made to
the same flue pipe.
1.
2.
3.
4.
Carefully inspect the chimney or exhaust vent
system.
Make sure it is properly sized and in good work-
ing condition.
Follow the instructions supplied by the appliance
manufacturer.
The installation must strictly comply with all ap-
plicable codes, authorities having jurisdiction and
the latest revision of the National Fire Protection
Association Standard NFPA 31 for the installa-
tion of chimneys and vent sizing, (or CSA-B139
and CSA-B140 in Canada).
Regulation by these authorities take precedence
over the general instructions provided in this in-
stallation manual.
•
•
•
•
•
Fire, Smoke & Asphyxia-
tion Hazard
WARNING
!
Figure 2 – Chimney Design - Above the Roof
NOTE: Correct
chimney design is
shown by dotted
lines. Incorrect
chimney design,
as shown by the
solid lines, may
result in down-
drafts.
Inspect/Prepare Installation Site

RWB 6104 BNX Page 7
The flue pipe should have an upward pitch
toward the chimney of at least 1/4” per foot of
length. It should fit tightly and should not project
into the chimney.
Any leakage between tiles, around clean-out
doors, or around the vent pipe should be sealed.
INSULATED STAINLESS STEEL CHIMNEY LINERS
The new designs of high efficiency oil furnaces
and boilers in conjunction with flame retention oil
burners are more efficient. One result of increased
efficiency is lower flue gas temperatures. As
flue gases rise in the chimney, they will cool and
condense when they reach the dew point. The
condensation will mix with the sulphur in the flue
gases creating sulphuric acid. The acid will attack
the chimney mortar, brick and clay liners caus-
ing corrosion, deterioration and blockage of the
chimney. Eventually the blockage could prevent
exhausting the flue gases. Instead, the flue gases
could vent out the barometric damper into the liv-
ing space.
Therefore, it is strongly recommended that an ap-
proved insulated stainless steel liner be installed.
For those installations not requiring a chimney,
such as through-the-wall vented appliances, follow
the instructions given by the appliance and power
venter (if used) manufacturers.
Combustion Air Supply Information
5.
6.
closure. The openings should have free access to
the building interior, which should have adequate
infiltration from the outside.
Exhaust fans and other air-using devices
Size air openings large enough to supply all air-
using devices in addition to the minimum size
required for combustion air. If there is any possibil-
ity of the equipment room developing a negative
pressure due to exhaust fans, clothes dryers, etc.,
either pipe combustion air directly to the burner or
provide a sealed enclosure for the burner and sup-
ply it with its own combustion air supply.
Direct Air Supply and Side Wall Venting
Appliances located in confined spaces
All confined spaces should have two (2) perma-
nent openings; one near the top of the enclosure
and one near the bottom of the enclosure. Each
opening must have a free area of not less than
one (1) square inch per 1,000 BTU’s per hour of
the total input rating of all appliances within the en-
Connect Outside Air Duct
to NX Adapter
The outside air adapter must be installed by strictly
following the kit installation instructions.
DO NOT attempt to install outside air piping without
using the outside air adapter and instructions pro-
vided.
Abundant fresh air is required for proper combus-
tion.
•
•
•
Failure to install adapter properly
could result in impaired combustion,
appliancesoot-up,puffbackofsmoke,
and fire or asphyxiation hazards.
WARNING
!
The burner cannot properly burn the fuel if it is not
supplied with a reliable combustion air source.
Follow the guidelines in the latest editions of the
NFPA 31 and CSA-B139 regarding providing ad-
equate air for combustion and ventilation.
•
•
Failure to provide adequate air supply could se-
riously affect the burner performance and result
in damage to the equipment, asphyxiation, ex-
plosion or fire hazards.
Adequate Combustion
and Ventilation Air Supply
Required
WARNING
!
When retrofitting appliances that have unlined
stainless steel combustion chambers, protect the
chamber by lining the inside surfaces with a ce-
ramic fiber blanket, such as a wet-pac or other
suitable refractory material.
Some steel chambers may not require liners be-
cause the appliance was designed and tested
for use with flame retention burners. Refer to the
manufacturer’s instructions.
•
•
Failure to comply could result in damage to the
heating equipment and result in fire or asphyxi-
ation hazards.
WARNING
!Protect Steel Combustion
Chamber From Burnout
Inspect/Prepare Installation Site
For direct vent installations, follow instructions
provided with appliance and direct vent system.
Outside combustion air is required for direct vent-
ing.
When installing an NX outside air adapter (Beckett
Part Number 1014U), refer to the instruction sheet
supplied with the adapter. This kit allows combus-
tion air to be piped directly to the burner. The NX
outside air adapter kit may also be used for chim-
ney vent applications that require outside combus-
tion air.

Page 8 RWB 6104 BNX
Inspect/Prepare Installation Site
Clearances to burner and appliance
Provide space around burner and appliance for
easy service and maintenance.
Check minimum clearances against those shown
by the appliance manufacturer and by applicable
building codes.
Combustion chamber — Burner retrofitting
Verify that the appliance combustion chamber
provides at least the minimum dimensions given in
Table 3.
••
•
•
notched hole in the burner housing. Make note
that the curved end of the baffle should be below
the motor bolt boss. Tighten the thread cutting
screw to 12-24 in-lbs.
Mount Burner on Appliance
Verify that the air tube installed on the burner
provides the correct insertion depth. Refer to Fig-
ure 4.
The end of the air tube should normally be 1/4”
back from the inside wall of the combustion cham-
ber. Never allow the leading edge of the retention
ring to extend into the chamber, unless otherwise
specified by the appliance manufacturer.
Bolt the burner to the appliance using the flange
that is provided.
•
Prepare the Burner
General
In most cases, the burner is ready to mount to
the appliance. There can be situations where
the burner needs to be reconfigured to perform
properly in the appliance. Review the appliance
manufacturer’s specifications prior to installing to
determine if any modification is required to prop-
erly configure the burner.
Instruction on how to perform the following burner
preparation tasks can be found in the Profes-
sional Maintenance section.
Remove / install burner nozzle
Check head/air adjusting plate
Low Firing Rate Baffle (If specified)
The NX Low Firing Rate Baffle (LFRB), refer to
Figure 3, reduces the burner airflow and pressure.
Refer to the appliance manufacturer’s instruc-
tions or the Beckett OEM Specification Guide part
number 6711. To avoid poor burner performance,
do not omit the baffle when specified or install the
baffle when not specified.
NOTICE The Low Firing Rate Baffle may
have been factory installed. If field installation is
required, insert the Low Fire Rate Baffle into the
housing, aligning the mounting screw hole with the
•
•
•
•
Chamber Dimensions (inches)
Firing Rate
(GPH) Round I.D. Rectangular Height Floor to nozzle
Width Length
0.50 8 7 8 12 5-6
0.75 9 8 9 12 5-6
1.00 10 9 10 12.5 5-6
1.25 11 10 11 12.5 5-6
1.50 12 11 12 13 6-7
1.75 14 12 15 13.5 6-7
Table 3. Chamber Dimensions
Figure 3. – Mounting Low Fire Rate Baffle in
burner housing.
SK9698
SK9668
Figure 4. – Mounting Burner in Appliance

RWB 6104 BNX Page 9
Inspect/Prepare Installation Site
Always install fittings in accessible locations. To
avoid vibration noise, fuel lines should not run
against the appliance or ceiling joists.
Fuel Line Valves and Filter
Install two high quality, oil duty rated, fusible
handle design shutoff valves in accessible loca-
tions on the oil supply line. Locate one close to the
tank and the other close to the burner, upstream of
the filter for service access.
Install a generous capacity filter inside the building
between the fuel tank shutoff valve and the burner,
locating both the filter and the valve close to the
burner for ease of servicing. Filter should be rated
for 50 microns or less.
NOTICE To further protect the fuel supply
system and reduce nozzle orifice plugging with
firing rates below 0.75 gph, a dual filtration sys-
tem can be installed. This typically consists of a
50 micron primary filter, located near the fuel tank
and a secondary filter rated for at least 10 microns
located near the burner.
Fuel supply level with or above burner
•
•
Connect Fuel Lines•
The burner is shipped without the bypass plug
installed.
Install the bypass plug in two-pipe oil supply sys-
tems ONLY.
•
•
Failure to comply could cause Immediate pump
seal failure, pressurized oil leakage and the
potential for a fire and injury hazard.
WARNING
!Do Not Install Bypass Plug
with 1-Pipe System
The oil supply inlet pressure to the burner cannot
exceed 3 psig.
Insure that a pressure limiting device is installed
in accordance with the latest edition of NFPA 31.
Do NOT install valves in the return line. (NFPA
31, Chapter 8.)
Gravity Feed Systems: Always install an anti-
siphon valve in the oil supply line or a solenoid
valve (RWB Part # 2182602U) in the pump/noz-
zle discharge tubing to provide backup oil flow
cut-off protection.
•
•
•
•
Damage to the filter or pump seals could cause
oil leakage and a fire hazard.
Oil Supply Pressure
Control Required
!
!CAUTION
Oil Leak and Fire Hazard
WARNING
!
Install the oil tank following applicable stan-
dards in the U.S. by referring to the latest
edition of NFPA 31 or CSA-B139 & CSA-B140
in Canada, and all authorities having jurisdic-
tion.
Never use Teflon tape on fuel oil fittings.
Tape fragments can lodge in fuel line components
and fuel unit, damaging the equipment and pre-
venting proper operation.
Use oil-resistant pipe sealant compounds.
•
•
•
Damage to the pump could cause impaired
burner operation, oil leakage and appliance
soot-up.
Do Not Use Teflon Tape
!
!CAUTION
NOTICE To determine the proper fuel line
size, refer to the fuel pump manufacturer’s instruc-
tions provided with the burner. Refer to Figure 5 or
Figure 6 for typical installation layouts.
The burner is supplied with either a one-stage
pump or a two-stage pump based on the oil supply
system requirements. Consult the instructions
provided with the pump for installation specifica-
tions.
When installing a one-pipe system, connect the
inlet line to the pump inlet. The fuel pump may be
installed with gravity feed or lift. The maximum
allowable lift for a single pipe installation is 8 ft.
When installing a two-pipe system, remove the
1/16” pipe bypass plug from plastic bag attached
to fuel unit. Remove 1/4” plug from return port.
Insert and tighten the bypass plug. Attach return
and inlet lines. The return line should terminate
approximately 3 to 4” above supply line inlet.
Failure to do this may introduce air into the system
and could result in loss of prime.
Fuel Line Installation
Route the fuel line through the opening in the
bottom of the burner cover. Continuous lengths
of heavy wall copper tubing are recommended.
Always use flare fittings. Never use compression
fittings.
•

Page 10 RWB 6104 BNX
The burner may be equipped with a single-stage
fuel unit for these installations. Connect the fuel
supply to the burner with a single supply line if you
want a one-pipe system (making sure the bypass
plug is NOT installed in the fuel unit.) Manual
bleeding of the fuel unit is required on initial start-
up. If connecting a two-pipe fuel supply, install the
fuel unit bypass plug.
Fuel supply below the level of the burner
When the fuel supply is more than eight feet below
the level of the burner, a two-pipe fuel supply sys-
tem is required. Depending on the fuel line diam-
eter and horizontal and vertical length, the instal-
lation may also require a two-stage pump. Consult
the fuel unit manufacturer’s literature, included
with the burner, for lift and vacuum capability.
Fuel line installation –
Continuous lengths of heavy wall copper tubing
are recommended. Always use flare fittings.
Never use compression fittings.
Always install fittings in accessible locations.
Proper routing of fuel lines is required to prevent
air cavitation and vibration.
•
•
Start the Burner and Set Combustion
Wire burner
•
Burner packaged with appliance
Refer to appliance manufacturer’s wiring dia-
gram for electrical connections.
Burner installed at jobsite
Refer to Figures 7a and 7b, for typical burner
wiring, showing cad cell primary controls. Burner
wiring may vary, depending on primary control
actually used.
Refer to the appliance manufacturer’s wiring
diagram prior to connecting the burner wiring.
All wiring must be in accordance with the latest
revision of National Electric Code NFPA 70 and
all local codes and regulations. In Canada, all
wiring is to be in accordance with the Canadian
Electrical Code, Part 1.
Special wiring required with covered burn-
ers
The mounting plate is not a conduit connection
point. Pass the conduit and attached connector
through the opening in the mounting plate and at-
tach it directly to the burner-mounted 4x4 electrical
box.
If attaching a burner cover to a previously installed
burner, attach the mounting plate and then slide
the conduit into the “J” shaped conduit slot.
••
••
•
•
Figure 5. – Inside Tank Gravity Feed System
Figure 6. – Outside Buried Tank-Lift System
Disconnect electrical power before installing or
servicing the burner.
Provide ground wiring to the burner, metal control
enclosures and accessories. (This may also be
required to aid proper control system operation.)
Perform all wiring in compliance with the Nation-
al Electrical Code ANSI/NFPA 70 (Canada CSA
C22.1)
•
•
•
Electrical shock can cause severe
personal injury or death.
WARNING
!Electrical Shock Hazard
Incorrect Wiring Will Re-
sult in Improper Control
Operation
GeniSys 7505 Control wiring label colors may
not match the wire colors of the burner or other
manufacturers’ controls.
The GeniSys Control should be wired according
to the appliance manufacturer’s instructions.
•
•

RWB 6104 BNX Page 11
Wiring Connections Diagram•
Start the Burner and Set Combustion
Follow the appliance manufacturer’s wiring dia-
grams and note all required safety controls.
Typical safety controls include high temperature
or pressure limits, low water cutoffs, pressure re-
lief valves and blocked flue sensing switches.
Verify all limit and safety controls are installed and
functioning correctly, as specified by the manu-
facturer, applicable safety standards, codes and
all authorities having jurisdiction.
Ensure that the appliance is free of oil and oil
vapor before starting or resetting the burner.
•
•
•
•
All heating appliances must have
HIGH LIMIT protection to interrupt
electrical power and shutdown the
burner if operating or safety controls
fail and cause a runaway condition.
Explosion, Fire, Scald,
and Burn Hazard
Figure 7a. – GeniSys 7505 Control interrupted igni-
tion, valve-on delay only (no motor-off delay)
Figure 7b. – GeniSys 7505 Control Interrupted igni-
tion, valve-on delay and motor-off delay
SAFETYAND
OPERATING
LIMITS
LIMIT
L1
L2 (VLV)
VALVE
L2
MOTOR
L2 (MTR)
L2 (IGN)
IGNITER
CAD
CELL
MOTOR
IGNITER
W
R
80
70
60
50
50
70
80
60
OIL VALVE
CAD CELL
THERMOSTAT
TR
TW
TR-TW
JUMPER
TR-TW TERMINALS
LOCATED ON OPPOSITE
SIDE OF CONTROL
L1
L2
SAFETYAND
OPERATING
LIMITS
LIMIT
L1
L2 (VLV)
VALVE
L2
MOTOR
L2 (MTR)
L2 (IGN)
IGNITER
CAD
CELL
MOTOR
IGNITER
W
R
80
70
60
50
50
70
80
60
OIL VALVE
CAD CELL
THERMOSTAT
TR
TW
TR-TW
JUMPER
TR-TW TERMINALS
LOCATED ON OPPOSITE
SIDE OF CONTROL
L1
L2
LIMIT L1 - LIMIT
Refer to the appliance manufacturer’s wiring dia-
gram prior to connecting the burner wiring. All wir-
ing must be in accordance with the latest revision
of National Electric Code NFPA 70 and all local
codes and regulations.
NOTICE The 7505 primary control with
valve-on delay (pre-time) and burner motor-off delay
(post-time) requires a constant 120 volts AC power
source supplied to the BLACK wire on the control.
The RED wire goes to the appliance limit circuit.
Please note that other control manufacturers may
use different wire colors for power and limit connec-
tions.
Make connections to the control’s terminals as shown
in Figures 7a and 7b. Refer to the label on the un-
derside of the control for wiring details.
NOTICE Motor-off delay on a 7505P will be
disabled if the safety and operating limits as shown
in Figures 7a and 7b interrupt power to the control
terminal L1.
Connect thermostat leads to the TR and TW termi-
nals on the control or jumper the TR and TW termi-
nals on the control, as directed by the appliance wir-
ing diagram.
Thermostat anticipator Current: 0.1 amp
Thermostat voltage: 24 volts AC
○
○
▪
▪
NOTICE If the thermostat short cycles or
operates improperly, it may require an isolation
relay for proper operation. The Beckett A/C Ready
Kit (part no. 51950U) provides this function. Wiring
instructions are included with the A/C Ready Kit.

Page 12 RWB 6104 BNX
Typical Burner Sequence of Operation for
GeniSys 7505 Control.
Refer to the appliance manufacturer’s wiring diagram for
actual specifications.
Standby: The burner is idle, waiting for a call for
heat.
Valve-On Delay: The igniter and motor are on
while the control delays turning on the oil solenoid
valve for the programmed time.
Trial For Ignition: The oil solenoid valve is
energized. A flame should be established within
the factory set trial for ignition time (lockout time).
Lockout: The control has shut down for one of the
following safety reasons:
a. The trial for ignition (lockout) time expired
without flame being established.
b. The cad cell detected flame at the end of the
Valve On Delay state.
To reset the control from lockout click the button
1-second.
NOTE: A recurrence of the above failure modes
or a failed welded relay check could cause the
control to enter a Hard Lockout state that must
1.
2.
3.
4.
Recycle: If the flame is lost while the burner is
firing, the control shuts down the burner, enters a
60 second recycle delay, and repeats the ignition
sequence. The control will continue to Recycle
each time the flame is lost, until it reaches a pre-
set time allotment. The control will then go into
Hard Lockout instead of recycle. This feature
prevents excessive accumulation of oil in the
appliance firing chamber.
8. Motor-Off Delay: If applicable, the oil solenoid valve
is turned off and the control delays turning the motor
off for the set motor-off delay time before the control
returns to standby.
9. Pump Prime: The igniter and motor are on with the
oil solenoid valve energized for 4 minutes. During
Pump Prime mode, the cad cell is disregarded,
allowing the technician to prime the pump without
having to jumper the cad cell.
10.Cad Cell Resistance Indicator: During the burner
run state, click the reset button (less than 1 second)
to check the cad cell resistance range. The yellow
light will flash 1 to 4 times, depending on the amount
of light detected by the cad cell. See chart below.
Yellow Light
Flashes
Flame Detection Range
1 Normal (0-400 ohms)
2 Normal (400-800 ohms)
3 Normal (800-1600 ohms)
4 Limited (1600 ohms lockout)
7.
2
1
3
5
6
8
4
7
Standby
Motor-off delay
Valve-on delay Trial for
ignition
Ignition carryover
Run
Lockout
Recycle
9Pump
prime
GeniSys Model 7505 Control
The control can malfunction if it gets wet, leading
to accumulation of oil or explosive oil vapors.
Never install where water can flood, drip or con-
dense on the control.
Never use a control that has been wet - replace it.
•
•
•
Can cause severe injury, death, or property
damage.
Fire or Explosion Hazard
be reset only by a qualified service
technician.
To reset from Hard Lockout, hold the
reset button for 15 seconds until the
yellow light turns on.
Ignition Carryover: Once flame is
established, the igniter remains on for
10 additional seconds to ensure flame
stability.
Run: The flame is sustained until the
call for heat is satisfied. The burner
is then sent to Motor-Off Delay, if
applicable, or it is shut down and sent to
Standby.
5.
6.

RWB 6104 BNX Page 13
Table 6 - Status Lights
Light Color On Continuously Flashing
Red Restricted (Hard) Lockout Soft Lockout
Green Flame Sensed during normal operation (Could
be stray light during standby)
Recycle
Yellow Control is in Pump Prime mode or
Reset button currently held for 15+ seconds.
Cad Cell resistance. See “Cad Cell Resistance
Indicator” on Page 12, for a table of resistance
values.
Table 5 - Reset Button Operation
If the burner is in the
below state:
Pushing the reset button will:
Button Click
(press < 1 second) Button Hold (press > 1 second) Button Hold (press 15+ seconds)
Lockout Reset from Soft Lockout Reset from Restricted (Hard)
Lockout
Valve-on Delay, Trial for
Ignition, Ignition Carryover
Go to Pump Prime (see
“Priming the Pump” above)
Disable the Burner:
Any time the burner is running,
press and hold the reset button
to disable the burner. The
burner will remain off as long
as the button is held.
Enables Pump Priming:
After the reset button has been
held for 15 seconds, the button
can then be clicked during the
next ignition sequence to enter
Pump Prime mode.
Run (igniter is shut off)
Yellow light flashes to indicate
cad cell resistance. See “Cad
Cell Resistance Indicator” for
table of resistance values.
Motor-Off Delay,
Standby
No action
Pump Prime No action Exit Pump Prime mode and return to Standby
Reset Button Operation
Table 5 explains what action the control will take when the reset button is pressed for different lengths of time
during the various burner operating states.
Display Module:
For programming and
diagnostics
Alarm Module:
For adding isolated
low voltage alarm
contacts to the base
control. See Alarm
Module Instructions for
specifications.
Figure 8. GeniSys Model 7505 Control
Cad Cell
Connections
Wiring
Connections
Communication Port 2
Reset Button
with Red Light
Green Light
Yellow Light
Communication Port 1
Thermostat Terminals
Burner Controls

Page 14 RWB 6104 BNX
61351
7. RECYCLE. If the flame is lost while the burner is
firing, the control shuts down the burner, enters
a 60 second recycle delay, and then repeats the
above ignition sequence. If flame is lost three
times in a row, the control locks out to prevent
cycling with repetitious flame loss due to poor
combustion.
8. BURNER MOTOR-OFF DELAY. The fuel valve
is closed and the burner motor is kept on for the
selected motor-off delay time before the control
returns the burner to standby.
Figure 9. Typical Burner Wiring & Burner Sequence of Operation for R7184P Control.
Refer to the appliance manufacturer’s wiring diagram for actual specifications.
1. STANDBY. The burner is idle, waiting for a call for
heat. When a call for heat is initiated, there is a 3-
10 second delay while the control performs a safe
start check.
2. VALVE-ON DELAY. The ignition and motor are
turned on for a 15 second valve-on delay.
3. TRIAL FOR IGNITION (TFI). The fuel valve is
opened. A flame should be established within the
15 second lockout time.
4. LOCKOUT. If flame is not sensed by the end of
the TFI, the control shuts down on safety lockout
and must be manually reset. If the control locks
out three times in a row, the control enters restrict-
ed lockout.
5. IGNITION CARRYOVER. Once flame is estab-
lished, the ignition remains on for 10 seconds
to ensure flame stability before turning off. If the
control is wired for intermittent duty ignition, the
ignition unit stays on the entire time the motor is
running.
6. RUN. The burner runs until the call for heat is sati-
fied. The burner is then sent to burner motor off
delay, if applicable, or it is shut down and sent to
standby.
Feature Interrupted
ignition Limited reset, Limited recycle Diagnostic LED, cad cell indicator Valve-on delay Burner motor off delay Alarm Con- tacts
R7184A YES YES YES — — —
R7184B YES YES YES YES — —
R7184P YES YES YES YES YES Optional
Control System Features
Burner Controls
SK9359

RWB 6104 BNX Page 15
The R7184 primary control with valve-on delay
and burner motor-off delay, shown in Figure 9,
requires a constant 120 volt AC power source
supplied to the black wire on the control. (Refer
to the appliance manufacturer’s instructions.) The
red wire goes to the appliance limit circuit. Please
note that other control manufacturers may use dif-
ferent wire colors for power and limit connections.
Wire Burner
Start the Burner and Set Combustion
Do not allow oil to spray into a hot combustion
chamber while bleeding air from the pump.
Install a gauge in the nozzle discharge port tub-
ing or fully open the pump bleed valve to prevent
oil spray from accumulating in the combustion
chamber during the air bleed procedure.
Ensure that all bubbles and froth are purged from
the oil supply system before tightening the pump
bleed valve.
Ensure that the appliance is free of oil and oil
vapor before starting or resetting the burner.
•
•
•
•
Failure to prime the pump properly could result
in unstable combustion, hot gas puff-back and
heavy smoke.
Hot Gas Puff-Back and
Heavy Smoke Hazard
Start-up and Initial Settings
Open the shutoff valves in the oil supply line to
the burner.
Referencing Figure 10a or 10b, verify and/or set
the Head/Air Adjustment Pointer to the value
specified by the Appliance Manufacturer. If the
Appliance Manufacturer’s values are not avail-
able, refer to Table 7a or 7b. (This is an initial
air setting for the pump bleeding procedure
only.) Calibrated test instruments must be used
for the final head/air adjustment.
Adjust the thermostat or temperature control-
ler to call for heat. (Note: return controller(s) to
the original settings upon completion of burner
installation or service.)
Close the line voltage switch to start the burner.
If the burner does not start within the 3 to 10
second safety start check timing, you may have
to reset the safety switch on the burner primary
control.
Bleed the air from the fuel pump as soon as the
burner motor begins rotating.
•
1.
2.
3.
4.
5.
Pointer
Zero Setting
Locking Nut
Adjustment
Screw Am52000
Figure 10b. – New Style Head/air Adjustment
Plate
Figure 10a. – Old Style Head/air Adjustment
Plate
Upper Acorn Nut
(Lock Zero
Calibration)
Lower Acorn Nut
(Lock Air Setting)
Scale
Pointer
Splined
Nut
Adjustment
Nut
SK9667
Prepare for combustion tests by drilling a 1/4 ”
sampling hole in the flue pipe between the ap-
pliance and the barometric draft regulator. Seal
this hole when testing is complete. (See appli-
ance manufacturer’s instructions for location.)
Check/Adjust Zero Calibration for older style
Head/Air Adjustment Mechanism. Refer to
Figure 10a.
Loosen the splined nut and lower acorn nut
approximately one turn. (DO NOT loosen the
upper acorn nut. This is used only for setting
the zero adjustment.) (See Figure 10a.)
A 5/16” nut driver or flat blade screwdriver
can be used to turn the adjustment screw for
head/air setting.
Check/Adjust Zero Calibration for newer
style Head/Air Adjustment Mechanism. Refer
to Figure 10b.
Slightly loosen the zero setting acorn.
Turn the screw until the reading is set to
zero. (Mid-point of pointer should line up with
zero.
6.
7.
a.
b.
8.
a.
b.

Page 16 RWB 6104 BNX
Start the Burner and Set Combustion
Turn the air adjustment screw counterclock-
wise to adjust the plate with the pointer to the
zero position.
Slide the nozzle line assembly forward until
the retention head engages the fixed stops in
the retention ring at the end of the air tube.
Tighten the zero setting acorn nut.
The rear door must be closed. The adjust-
ment screw may now be turned clockwise to
adjust the head/air setting.
c.
d.
e.
f.
NX Air Tube & Head Combinations
Head/Air
Setting
LG - (9-slot head)
LH - (6-slot head)
LB - (9-slot head)
LC - (6-slot head)
LD - (9-slot head)
LF - (6-slot head)
0.5 0.40 – 0.50 -- 1.10 – 1.25
1.0 0.45 – 0.60 -- 1.20 – 1.35
2.0 0.55 – 0.70 0.85 – 1.05 1.30 – 1.45
3.0 0.65 – 0.80 0.95 – 1.15 1.40 – 1.55
4.0 0.75 – 0.90 1.05 – 1.25 1.50 – 1.65
5.0 0.85 – 1.00 1.15 – 1.35 1.60 – 1.75
Table 7a. – NX Burners
NOTICE The NX burner has a reduced diameter air tube, precision-designed air throttle cup and combustion
head for improved performance. This design provides very accurate control of the air/fuel ratio, but the light reaching
the cad cell through small holes in these components is limited. Because of this, the average cad cell resistance
may be higher than conventional burners with larger openings.
NX Air Tube & Head Combinations
Head/Air
Setting
LG - (9-slot head)
LH - (6-slot head)
LB - (9-slot head)
LC - (6-slot head)
LD - (9-slot head)
LF - (6-slot head)
0.5 – 0.40 – 0.60 –
1.0 0.40 – 0.55 0.50 – 0.70 1.10 – 1.25
2.0 0.50 – 0.65 0.60 – 0.80 1.20 – 1.35
3.0 0.60 – 0.75 0.70 – 0.90 1.30 – 1.45
4.0 0.70 – 0.85 0.80 – 1.00 1.40 – 1.55
5.0 0.80 – 0.95 0.90 – 1.10 –
Table 7b. – NX Burner with Low Fire Rate Baffle (LFRB) Installed
NOTICE Use factory-set or manufacturer’s recommended Head/Air Setting for ‘Starting the Burner and Set-
ting Combustion’. The Head/Air Settings shown in Tables 7 are provided for reference purposes and represent a
general range of rates and settings. Individual appliances, vent systems, and field conditions will impact the overall
burner set up required for satisfactory combustion performance.
Turn the adjusting screw to a setting 1/2
number lower than the proper setpoint as
indicated in Tables 7a and 7b. Then turn
the adjusting screw counterclockwise to the
proper setting.
Tighten the spline nut after the head/air set-
ting has been adjusted.
g.
h.

RWB 6104 BNX Page 17
OIL-BURNING EQUIPMENT
SHALL BE CONNECTED TO
!
!CAUTION
FLUES HAVING SUFFICIENT DRAFT AT ALL TIMES
TO ENSURE SAFE AND PROPER OPERATION OF
THE BURNER.
Start Burner and Set Combustion
Set Combustion with Test Instruments•
Allow the burner to run for approximately 5 to 10
minutes.
Set the stack or over-fire draft to the level speci-
fied by the appliance manufacturer.
Natural Draft Applications; typically over-fire
draft is -0.01” or -0.02” w.c.
Direct Venting; typically may not require draft
adjustment.
High Efficiency/Positive Pressure Appli-
ances; also vary from traditional appliances (see
manufacturer’s recommendations).
Follow these five steps to properly adjust the
burner:
Step 1: Adjust the head/air until a trace of smoke
is achieved. This can be accomplished by turn-
ing the screw on the head/air adjustment plate
assembly to increase air (CCW) or decrease air
(CW).
Step 2: At the trace of smoke level, measure the
CO2(or O2) . This is the vital reference point
for further adjustments. Example: 13.5% CO2
(2.6% O2)
Step 3: Increase the air to reduce the CO2by 1.5
to 2 percentage points. (O2will be increased
by approximately 2.0 to 2.7 percentage points.)
Example: Reduce CO2from 13.5% to 11.5%
(2.6% to 5.3% O2).
1.
2.
•
•
•
3.
Step 4: Recheck smoke level. It should be Zero.
This procedure provides a margin of reserve air
to accommodate variable conditions. If the draft
level has changed, recheck the smoke and CO2
levels and readjust burner, if necessary.
Step 5: Once the combustion has been set,
tighten the lower acorn nut and splined nut on
the air adjustment assembly. See Figure 10a.
Chimney Vent Systems: Install the burner cover
and repeat Steps 2 and 4 above. If CO2increas-
es (O2decreases), remove the cover and adjust
the air setting so the CO2(O2) with the cover
installed meets the requirements of Step 3.
Direct Vent Systems with outside air ducted to
burner: Install the burner cover.
Start and stop the burner several times to
ensure satisfactory operation. Test the primary
control and all other appliance safety controls to
verify that they function according to the manu-
facturer’s specifications.
Cover Installation
Install the four cover mounting thumb screws in
the cover mounting plate.
Install the cover over the mounting plate while
aligning the side slots with the installed cover
mounting screws. The latest cover design has
special tabs that push into slots in the mounting
plate.
4.
5.
6.
•
1.
2.

Page 18 RWB 6104 BNX
Trained Service Technician’s Regular
Maintenance
The following guidelines are provided for routine
maintenance.
Replace the oil supply line filter. The line filter
cartridge must be replaced to avoid contamina-
tion of the fuel pump and nozzle.
Inspect the oil supply system. All fittings should
be tight and leak-free. The supply lines should
be free of water, sludge and other restrictions.
Remove and clean the pump strainer if appli-
cable.
Replace the used nozzle with a new nozzle that
conforms to the appliance manufacturer’s speci-
fications.
Clean and inspect the electrodes for damage,
replacing any that are cracked or chipped.
Check electrode tip settings. Replace electrodes
if tips are rounded.
Inspect the igniter spring contacts.
Clean the cad cell lens surface, if necessary.
Make sure Low Firing Rate Baffle is in place if
required for the burner application. Omitting the
baffle can result in unacceptable burner combus-
tion.









Perform Regular Maintenance
DO NOT TAMPER WITH THE UNIT OR CON-
TROLS - CALL YOUR QUALIFIED SERVICE
TECHNICIAN OR SERVICEMAN.
To ensure continued reliable operation, a quali-
fied service technician must service this burner
annually.
More frequent service intervals may be required
in dusty or adverse environments.
Operation and adjustment of the burner requires
technical training and skillful use of combustion
test instruments and other test equipment.
•
•
•
•
Tampering with or making incorrect
adjustments could lead to equip-
ment malfunction and result in
asphyxiation, explosion or fire.
WARNING
!Annual Professional Ser-
vice Required
Inspect all gaskets. Replace any that are dam-
aged or would fail to seal adequately.
Clean the blower wheel, air inlet, air guide, re-
tention head, throttle cup and throttle ring of any
lint or foreign material.
Use a clean soft cloth with a degreaser to
clean any accumulated soot or oil stains
from the throttle cup sight windows.



Use a clean soft cloth and degreaser, on an an-
nual basis, to remove any build-up or dark stains
from the windows.
If damaged, replace the nozzle line assembly with
an assembly that has a windowed throttle cup.
•
•
If a window is punctured, signifi-
cantly scratched or removed from
the throttle cup, the burner perfor-
Do Not Puncture, Scratch,
or Remove Flame Sight-
ing Windows
mance could be impaired, resulting in safety
lockout, appliance soot-up, equipment damage,
hot gas puff-back and asphyxiation hazard.
WARNING
!
Check motor current. The amp draw should not
exceed the nameplate rating.
Check all wiring for secure connections or insula-
tion breaks.
Check the pump pressure and cutoff function.
Check primary control safety lockout timing.
Check ignition system for proper operation.
Inspect and clear the vent system and chimney
of any soot accumulation or other restriction.
Clean the appliance thoroughly according to the
manufacturer’s recommendations.
Check the burner performance. Refer to the sec-
tion “Set combustion with test instruments”.
It is good practice to keep a record of the service
performed and the combustion test results.










RWB 6104 BNX Page 19
Nozzle Installation•
Perform Regular Maintenance
Perform the following steps when replacing a nozzle.
Remove the nozzle line assembly to gain ac-
cess to the nozzle.
Use a 3/4” open-end wrench to hold the nozzle
adapter. DO NOT attempt to remove or replace
the nozzle without securing the adapter, as
nozzle alignment could be seriously affected.
Do not squeeze the electrodes when handling
the nozzle line assembly. Excessive force could
change the electrode tip settings or damage the
ceramic electrode insulators.
1.
2.
3.
Use only nozzles having the brand, flow rate (gph), spray
angle and pattern specified by the appliance manufactur-
er or Beckett Residential Burner OEM Spec Guide, Part
#6711.
Follow the appliance manufacturer’s specifications for the
required pump outlet pressure for the nozzle, since this
affects the flow rate.
Nozzle manufacturers calibrate nozzle flow rates
at 100 psig.
This burner utilizes pressures higher than 100
psig, so the actual nozzle flow rate will be greater
than the gph stamped on the nozzle body. (Exam-
ple: A 1.00 gph nozzle @ 140 psig = 1.18 gph)
For typical nozzle flow rates at various pressures see ac-
companying chart.
•
•
Incorrect nozzles and flow rates
could result in impaired combus-
tion, under-firing, over-firing, soot-
ing, puff-back of hot gases, smoke
WARNING
!Correct Nozzle and Flow
Rate Required
and potential fire or asphyxiation hazards.
Before proceeding, turn off the main power
switch to the burner.
Remove the burner cover by loosening the four
thumb screws (two on each side of burner).
Disconnect the copper connector tube assembly
from the nozzle line bulkhead fitting.
Loosen the two screws securing the igniter re-
taining clips and rotate both clips to release the
igniter baseplate. The igniter should pop up and
be supported by the prop spring.
Loosen the two screws securing the rear door.
Swing the door to the right and down.
Loosen the splined nut.
Remove the nozzle line electrode and head
assembly from the burner by drawing it straight
back and out the rear door opening. The adjust-
ment mechanism is still attached. Be careful not
to damage the electrodes or insulators while
handling.
To replace the nozzle assembly, reverse the
above procedure.
1.
2.
3.
4.
5.
6.
7.
8.
Nozzle flow rate U. S. gallons per hour of No. 2 fuel oil when
pump pressure (psig) is:
Nozzle
size
(rated
at 100
psig)
125
psi
140 psi
(factory
std.)
150
psi
175
psi
200
psi
0.40 0.45 0.47 0.49 0.53 0.56
0.50 0.56 0.59 0.61 0.66 0.71
0.60 0.67 0.71 0.74 0.79 0.85
0.65 0.73 0.77 0.80 0.86 0.92
0.75 0.84 0.89 0.92 0.99 1.06
0.85 0.95 1.01 1.04 1.13 1.20
0.90 1.01 1.07 1.10 1.19 1.27
1.00 1.12 1.18 1.23 1.32 1.41
1.10 1.23 1.30 1.35 1.46 1.56
1.20 1.34 1.42 1.47 1.59 1.70
1.25 1.39 1.48 1.53 1.65 1.77
1.35 1.51 1.60 1.65 1.79 -
1.50 1.68 1.77 1.84 - -
1.65 1.84 - - - -
1.75 -----
Table 8. Nozzle Flow Rate by Size
Use care when handling, removing and installing oil
nozzles.
Carefully follow the guidelines provided in this sec-
tion.
•
•
A damaged nozzle could cause impaired com-
bustion, sooting, puffback of hot gases, smoke,
oil leakage and potential fire or asphyxiation
hazards.
Protect Nozzle from
Damage
!
!CAUTION
Removing Nozzle Line for Service (Refer-
ence the Replacement Parts Diagram.)
•

Page 20 RWB 6104 BNX
Figure 12. – Electrode tip gap and spacing
5/32” GAP
1/4” above
nozzle center
3/32” Nozzle-to-tip
Spacing
SK9664
Perform Regular Maintenance
Check/Adjust Electrodes
Check the electrode tip settings, as shown in
Figure 11. If necessary, adjust by loosening the
electrode clamp screw (Figure 12) and slide/rotate
the electrodes as necessary. When the adjustment
is complete, securely tighten the clamp screw.
Note that if the throttle cup is moved be sure to re-
position it with no gap between the nozzle adapter
and hub.
•
Use a 5/8” open-end wrench to carefully remove
the existing nozzle.
Inspect the nozzle adapter before installing the
new nozzle. If it is grooved or scratched on the
sealing surface, replace the nozzle line assem-
bly. If the surface is damaged, oil could leak
at the nozzle to adapter joint, causing serious
combustion problems.
Protect the nozzle orifice and strainer when in-
stalling. If the orifice gets dirt in it or is scratched,
the nozzle will not function properly.
To install a new nozzle, place a 3/4” open-end
wrench on the nozzle adapter. Insert the nozzle
into the adapter and secure finger tight. Finish
tightening with a 5/8” open-end wrench. Use
care to avoid bending the burner head support
legs or electrodes.
Do not over-torque the nozzle when install-
ing. This will cause deep grooves in the nozzle
adapter, preventing a seal when a new nozzle is
installed.
Carefully check and realign the electrode tips
after replacing a nozzle, ensuring the electrode
settings comply with Figure 11.
If the head was removed when replacing the
nozzle, carefully reconnect the head to the
nozzle adapter. Make sure to align the key in
the support leg with the keyway in the nozzle
adapter and to butt the head support to the
nozzle adapter shoulder, see Figure 12.
4.
5.
6.
7.
8.
9.
10.
Figure 11. – Nozzle Line/Head/Air Tube Assembly (Low firing rate shown.)
Retention Head
Retention Head
Head Support Legs
Head Support Legs
Electrode Tips
Electrode Tips
Electrode Clamp
Electrode Clamp
Electrode Bracket
Electrode Bracket
Electrode Insulator
Electrode Insulator
Electrode Extension Rods
Electrode Extension Rods
Nozzle Adapter
Nozzle Adapter
Nozzle
Nozzle
Stops in Retention Ring
Stops in Retention Ring
Retention Ring
Retention Ring
Throttle Ring
Throttle Ring
Throttle Cup
Throttle Cup
Nozzle Line
Nozzle Line
Bulkhead Fitting
Bulkhead Fitting
SK9666A
SK9666A
Throttle Cup Hub
Throttle Cup Hub
SK9666A
Check Retention Head Alignment and
Cad Cell Sighting (Refer to Figure 13.)
The cad cell sighting holes in the throttle cup
and the retention head must be aligned to allow
the cad cell to detect the flame. Make sure the
stamped key in the retention head collar lines
up with the keyway in the nozzle adapter when
mounting the retention head. Note that in specific
applications, the retention head may not have a
sighting hole.
•