Model 702G/O Advanced gas/oil burners — Instruction manual
Carlin part number MN702GO Rev. 06/23/14
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Where appliance instructions differ from this manual, follow the appliance instructions.
4.
Disconnect the 1/4" O.D. copper oil line.
5.
Remove the two housing cover locking screws and swing the housing open.
6.
Remove the zip-tie holding the UV scanner cable and air tube thermal fuse
lead.
7.
Partially remove the combustion head assembly, and disconnect the two
ignition cables from the electrodes.
8.
Rotate the combustion head assembly 90° and unscrew the scanner from
the sight tube.
9.
Disconnect the high temperature fuse leads, and remove the combustion
head assembly from the tube.
Thermal fuse
1.
When the burner is in a high-overfire draft condition, and not properly
adjusted, it is possible that the flame could flash back inside the air tube.
If this occurs, the thermal fuse will open in less than two seconds. The
fuse must be replaced. (The burner is supplied with spare fuses.)
Annual start-up and service
This burner must be started and serviced at least annually
by a qualified service technician. Failure to properly maintain
and service the burner could result in severe personal injury,
death or substantial property damage.
❏
Discuss burner/appliance operation with user to determine any problems
that may have occurred during the previous season and to verify user is
aware of proper operation and care of the burner/appliance.
❏
Review proper operation of the appliance/burner unit with the user.
❏
Turn off power to appliance.
❏
Remove combustion head assembly to clean and adjust if necessary.
(See above.)
❏
If the inside surface of the air tube and/or retention ring need to be
cleaned, clean them with a vacuum cleaner with brush attachment while
the combustion head assembly is out of the burner.
❏
Replace the oil nozzle with the correct size specified in this manual or
the OEM guide. See page 10 for the access/replacement procedure.
❏
Inspect and adjust the ignition electrodes and insulators per instructions
on page 11 of this manual. Replace if proper spacing cannot be achieved
or if components are damaged.
❏
Close the housing cover plate and secure in place.
❏
Inspect the fuel line oil filter. Replace if necessary.
Oil line filters — Use a non-bypassing filter to prevent nozzle
plugging caused by poor oil filtration. Non-bypassing filters
prevent small foreign particles from bypassing the filter, a
common problem with fiber element type filters. Another
problem of some filters is the fiber from filter element tears
can break away and plug the nozzle or fuel unit.
❏
Perform the complete checkout procedures of pages 18 to 23, including
system inspection and checks.
❏
Inform the user of any problems found.
8. Maintenance and service procedures
Turn off power to appliance when servicing burner. After servic-
ing, always operate burner/appliance to verify all components
are functioning correctly and that the burner is properly adjusted.
Failure to comply could result in severe personal injury, death or
substantial property damage.
General maintenance
Cleaning blower wheel
1. The blower wheel accumulates dust and debris from normal operation. You
will need to clean the wheel blades periodically to prevent reduction in airflow.
Inspect the blower wheel regularly by opening the housing cover.
2. To clean blades, when necessary, remove the bolts securing the motor to the
blower housing.
a. Slide the motor out and rotate to remove and access blower wheel.
b. Use a brush and vacuum to clean each blade and the blower housing
interior.
c. Install motor/wheel in blower housing and secure with the two bolts.
d. Push wire slack back into junction box.
Replacing blower motor or wheel
1. If either the blower wheel or motor must be replaced, remove the bolts secur-
ing the motor to housing.
2. Disconnect the motor wires in the burner junction box (coming from the EZ-
Contactor).
3. Loosen the Allen screw securing the blower to the motor shaft and remove
the wheel.
4. When assembling the replacement assembly, slide the wheel onto the motor
shaft and use feeler gauges to set space between the blower wheel and the
motor face. This space must be 3/16 inch.
5. Install the motor/wheel assembly in the housing, wire the motor leads and
secure the motor with the two bolts.
Motor maintenance
• Refer to motor manufacturer’s instructions for oiling the motor as needed.
Checking ignitor
Never test an ignitor by placing a screwdriver (or other metallic
object) across the high voltage clips. This could cause ignitor
damage or severe personal injury.
1. Checking 41000 ignitors only:
• Disconnect electrical power to burner.
• Open the burner access cover and remove ignitor wires from the elec-
trodes. Lightly clamp each ignitor wire to the burner housing, with the
wire ends pointed toward one another, spaced apart by a ½" to ¾" gap.
• Carefully energize ignitor and check for spark arcing at the high voltage
terminals. If spark jumps the gap, ignitor is good.
Removing the combustion head assembly
1.
To check the electrode settings or change the nozzle, you must remove
the combustion head assembly from the air tube. Follow the steps below,
and reverse the sequence to reassemble.
2.
Shut off the burner.
3.
Remove the four gas orifice spuds from the manifold.
