Cleaver-Brooks CBH 40 - Oil Pump

Nozzles may be of different capacities and it is ex-
tremely important that they are replaced in proper
firing order. Nozzles can be identified by the capa-
city and spray angle stamped on them. See chart 5-
2 for
proper location of nozzles.
The capacity stamped on side of nozzle represents
delivery rate with oil pressure at 100 psi. Since the
burner is designed to use considerably higher
atomizing oil pressures, the capacity of the nozzle
is greatly increased. Do not assume that under-
sized nozzles are installed on the basis of nozzle
marking compared to the burner input.
The oil pressure required for full burner input is
approximately 175 psi. Oil pressure is adjusted by
the regulator in the fuel oil pump and final
pressure setting may be slightly higher or lower. If
smoke occurs at open damper, the pressure should
be adjusted downward to clear the fire. See the
later section covering oil burner combustion ad-
justment.
IGNITION SYSTEM
Maintain the proper gap and dimensions of the
ignition electrode(s) for best ignition results.
Figures 5-3 or 5-4 show the correct settings.
Inspect electrode tips for signs of pitting or com-
bustion deposits and dress as required with a fine
file.
Inspect the insulators of the electrodes and the
feed through insulators for evidences of cracks or
chipping. If any are present replace the items, since
this can cause grounding of ignition voltage. Car-
bon is an electrical conductor, so it is necessary to
keep the insulating portion of electrode wiped
Chapter 5--Adjustment and Maintenance
clean if any is present. Ammonia will aid in
removing carbon or soot.
Check ignition cables for cracks in the insulation.
Also see that all connections between transformer
and electrodes are tight.
light Oil Strainer
The fuel oil strainer screen must be removed and
cleaned at regular intervals. It is advisable to
remove this screen each month and clean
thoroughly by immersing in solvent and blowing
dry with compressed air. To remove, loosen cover
cap screw being careful not to lose the copper
gasket. Tap strainer cover gently to loosen. Check
cover gasket. Slip pliers into the cross on the top of
the strainer and twist counterclockwise to remove
the basket. Re-assemble in reverse order.
OIL PUMP
Problems attributed to the pump can generally be
traced to other causes such as broken or restricted
fuel lines, lack of fuel, clogged filters, stuck or
closed valves, a high vacuum or even an excessive
head of oil.
The pressure gauge (Figure 1-1) reveals that the
pump gears are pumping and building up a steady
even pressure to deliver oil to the nozzles and at
the pressure to which the integral regulator has
been set. Collapse of the nozzle spray below the set
limit can indicate worn internal parts, although
these units are designed to give long periods of
operation without undue wear. If this situation is
verified, it is generally advisable to replace the
........ 3/B"
~~(\aEv---- ~q= __ ~~
3/B"
FIGURE 5-3. OIL BURNER, SPARK IGNITED-CBH 50-100
5-9