Oil Burner Maintenance - CleaverBrooks FLX Operation, Service And Parts Manual

Chapter 7
Electrical Controls
The operating controls should be inspected monthly.
Examine the tightness of electrical connections and keep the
controls clean. Remove any dust that accumulates on the
interior of the controls using low pressure air that is free of
moisture and oil. Take care not to damage the mechanism.
Examine any mercury tube switches for damage or cracks.
Dark scum over the normally bright surface of the mercury
indicates a damaged tube that may lead to erratic switching
action. Make certain that controls are correctly leveled.
Covers should remain on controls and panels at all times.
Dust and dirt can cause excessive wear or overheating of the
motor stator and the relay contacts, and affect operation of
other controls. The power supply to the boiler must be
protected with dual element fuses (fusetrons) or circuit
breakers. Similar fuses should be used in branch circuits.
Standard one-shot fuses are not recommended.
Flame Safeguard Control
This control requires minimal maintenance because the safety
and logic sections are integral and inaccessible, with no
accessible contacts. Regularly check to see that the retaining
screws holding the chassis to the mounting base are secure,
and that the amplifier and the program module are securely
inserted.
It is recommended that a spare control be kept on hand and
service be rotated between the active and the spare control
(programmer).
Note: NOTE: Be sure that the connecting
contacts on the control and the base are not
bent out of position.
WARNING
! DANGER
When replacing a control, be sure to lock
out the main power supply, since the control
is "hot" even though the burner switch is
off. Failure to heed this warning could result
in serious personal injury or death.
Your spare control should be wrapped in plastic and stored in
a dry atmosphere. During an extended shutdown (for
example, a seasonal shutdown), the active control should be
removed and stored in a dry atmosphere. Moisture can cause
problems with control operation.
The flame detector lens should be cleaned as often as
operating conditions demand. Use a soft cloth moistened with
detergent to clean the lens.
A safety check procedure should be established to test the
complete flame safeguard system at least once a month. Tests
should verify safety shutdown and a safety lockout upon
failure to ignite the main flame and upon loss of flame. Each
of these conditions should be checked on a scheduled basis.
7-6
Inspection and Maintenance
Refer to the burner manual for information regarding tests of
the flame safeguard system. Contact your local Cleaver-
Brooks authorized representative for assistance, if required.
Checking Loss of Flame
With the burner in normal operation at the low fire rate, shut
off the main burner fuel valve to interrupt the fuel supply and
extinguish the main flame.
The relay must signal the loss of flame, resulting in the fuel
valve(s) being deenergized. The control will lock out on a
safety shutdown. The flame failure light (and optional alarm)
will be activated. The blower motor will stop.
Turn the burner switch off. Reset the safety switch.
Reestablish the main fuel supply.
F. OIL BURNER MAINTENANCE
Refer to the burner sections for specific information
regarding operation and maintenance of the burner.
Oil strainers should be serviced frequently in order to
maintain a free and full flow of fuel to the burner. Installation
of a vacuum gauge in the burner supply line between the
burner oil pump and the strainer is strongly recommended.
Regular observation and recording of the gauge indication
will assist in determining when the strainer needs servicing.
Strainer Servicing
The fuel oil strainer element must be removed and cleaned or
replaced at regular intervals, or when a rising trend in the
burner supply pump suction indicates blockage. When
servicing the strainer, fuel supply and return line valves
should be shut off. The strainer should be drained of oil and
any sediment collected at the bottom of the canister. Remove
the cover and withdraw the strainer element. Replaceable
elements should be disposed of properly. Reusable elements
may be cleaned by immersing them in solvent until attached
deposits have been loosened, and then shaking them dry.
WARNING
! DANGER
Use only safety type solvents such as
C l e a v e r - B r o o k s " S a f e ty S o l v e n t " f o r
cleaning strainers or other components.
Work only in a well ventilated area. Do not
use gasoline or other flammable liquids as a
solvent. Do not dry the strainer elements
with compressed air. Failure to heed this
warning could result in serious personal
Injury or death.
Reassemble the strainer, taking care to seal the canister
properly to avoid air infiltration and resulting loss of suction.
Open the fuel supply and the return line valves.
750-177