10
B. Pump Maintenance
General Pump Information
Important information - Long or oversized inlet lines may
require the pump to operate dry during initial bleeding
period. In such cases, the priming may be assisted
by injecting fuel oil in the pump gear set. Under lift
conditions, lines and
fi
ttings must be air tight. To assure
this, “Pipe Dope” may be applied to both the used and
unused inlet and return
fi
ttings.
Do NOT use Te
fl
on tape
or compression
fi
ttings
Mounting Position
Beckett CleanCut pump may be mounted in any position
(except upside-down in a single pipe installation).
Vacuum Check
A Vacuum Gauge may be installed in either of the 1/4”
NPT inlet ports.
Pressure Check
When a pressure check is made use the nozzle port. If
the bleed port is used, the reading on the gauge should
be approximately 5 psig higher than the pressure reading
on the nozzle port. See
Figure 9
.
Cutoff Check
To check cutoff pressure dead head a pressure gauge
in the nozzle port. Run the burner for a short period of
time. Shut the burner off. The pressure will drop and hold
above zero. Pressurized or gravity feed installations must
not exceed 3 psi on inlet line or return line at the pump
per NFPA 31. A pressure greater than 10 psi may cause
damage to the shaft seal.
Pressurized or Gravity Feed Installations
Must not exceed 3 psi on inlet line or return line at the
pump per NFPA 31. A pressure greater than 10 psi may
cause damage to the shaft seal.
C. Solenoid Valve Testing
To check solenoid operation, perform the following.
1. Check for oil
fl
ow and operating pressure by
removing the copper tubing from the nozzle line
and installing a pressure gauge in the line. With
the motor running and the coil energized, check the
gauge. The pressure should read 100 psig unless
otherwise stated.
2. To check the solenoid valve cutoff function, deadhead
the pressure gauge onto the copper connector tube
attached to the nozzle port. Run the burner for a
short period of time. Shut the burner off. The solenoid
valve should close and the pressure should drop and
hold.
3. Replace the solenoid valve if it does not pass the
steps above.
Start Up Burner & Set
Combustion
A. Basic Burner Operation
Typical Constant Duty Ignition Con
fi
guration
With this Beckett ADC oil burner con
fi
guration, the motor
and igniter operate continuously while the valve that
controls oil
fl
ow is cycled by the switches on the power
washer. The motor is used to drive the blower and pump.
The rotational speed of the motor is determined by the
voltage supplied and the load placed on the motor. Pump
pressure and air settings are the main factors affecting
the motor load. The igniter converts battery DC voltage
into a high voltage spark to ignite the oil. The igniter is
capable of running continuously as long as the blower
wheel is circulating air across the igniter base. The pump
and solenoid valve are used to control the
fl
ow of oil from
the reservoir to the nozzle.
Igniter With Interrupted Duty Ignition
This optional control circuit is available to reduce current
draw on the charging system by turning the igniter off after
a
fl
ame has been established. This option controls igniter
operation based on a signal from a light sensing cad cell.
When light hits the cell the control will sense a decrease
in resistance across the sensor. A few seconds delay will
occur prior to the igniter switching off. As long as suf
fi
cient
light is reaching the cell eye, the igniter will remain off. If
light is removed from the sensor, the igniter will turn on
until light is again sensed by the cad cell.
With 7556 Primary Safety Control
The 7556 control provides the same bene
fi
ts as described
above, as well as added safety, convenience, and
performance features. It adds a valve on delay and motor-
off delay to the burner’s operation sequence that promote
clean burner operation. It has a lock-out function that shuts
the burner down if it is not operating properly. The control
adds fusing at the burner to protect against component
failures. The control also has redundant motor relays that
are checked for proper operation every heat cycle.
Variations to the burner circuits may
occur due to optional temperature,
pressure, and vacuum switches that control burner
operation. Note that when external switches are used to
control motor operation they must be sized correctly for
the rated current or a relay should be installed to isolate
the switches from the motor’s full load current.
Section: Start Up Burner & Set Combustion
