Page 19
Unit Start-Up & Adjustments
Before starting unit, make sure the oil tank is adequately
filled with clean No. 1 or No. 2 furnace oil.
NOTE - Water, rust or other contaminants in oil supply sys
tem will cause malfunction and failure of the internal parts
of the fuel pump.
CAUTION
Never burn garbage or paper in the heating system.
Never leave papers near or around the unit.
CAUTION
Blower access door must be in place before start‐up.
Burner Start-Up
1 - Set thermostat for heating demand and turn on elec
trical supply to unit.
2 - Open all shut-off valves in the oil supply line to the
burner.
3 - While the ignition is on, press and release the reset
button on the burner control (hold 1/2 second or less).
If the control has not locked out since its most recent
complete heat cycle, the lockout time will be extended
to 4 minutes and the ignition will remain on for the en
tire heat cycle.
4 - Bleed the pump until all froth and bubbles are purged.
The bleed port is located on the bottom of the fuel
pump. To bleed, attach a clear plastic hose over the
vent plug. Loosen the plug and catch the oil in an
empty container. Tighten the plug when all the air has
been purged.
NOTE -
A two-line fuel system will normally bleed itself
by forcing air back to the tank through the return line.
This type of bleeding procedure is not necessary.
5 - If burner fails to start within the set time, the burner
control will lock out operation. Press the reset button
to reset the control as in step 3. See figure 3 on page 3
for burner parts arrangement.
NOTE -
The reset button can be held for 15 seconds
for the Beckett 7505B primary control, at any time to
reset the controls lockout counter to zero and send the
control to standby
.
CAUTION
Do not push the reset button on the primary control
more than one time.
6 - Repeat steps 4 and 5, if necessary, until pump is fully
primed and oil is free of bubbles. Then, terminate the
call for heat. The burner control will resume normal
operation
Fuel Pump Pressure Adjustment
Measure fuel pump pressure with unit off. Attach pressure
gauge to pump outlet. Turn unit on and check pressure and
compare to table 9. Adjust if necessary.
Temperature Rise Adjustment
To measure temperature rise, place plenum thermometers
in warm air and return air plenums. Locate thermometer in
warm air plenum where thermometer will not “see” the heat
exchanger to prevent it from picking up radiant heat. Set
thermostat to its highest setting to start unit. After plenum
thermometers have reached their highest and steadiest
readings, subtract the readings. The difference in temper
atures in the supply and return air plenums should approxi
mate the temperatures listed in table 8 and on the ap
pliance rating plate.
If the temperature rise is not within the range listed, check
the following items:
D
Make sure that properly sized nozzle has been
used (table 9).
D
Make sure that fuel pump pressure is correct.
D
If furnace is in cutback mode, check for:
Dirty filters,
Dirty indoor coil,
Restricted ducts, closed registers, etc.
Table 8
Temperature Rise
Unit
Temperature Rise °F
SLO185UFV79
45 - 55
SLO185UFV105
45 - 55
SLO185UFV124
55 - 65
SLO185UFV141
55 - 65
Limit Control
Limit Control — Do not adjust from factory setting.
Combustion Check and Burner Adjustment
The following instructions are essential to the proper op
eration of SLO185UFV series oil furnaces. Refer to table 9
for nozzle and pump pressure information. The proper way
to adjust an oil burner is with a CO
2
analyzer and smoke
gun. A properly adjusted burner will result in a quiet, clean
fire which will prevent sooting and minimize cleaning. Us
ing the following procedure will provide a margin of reserve
air to accommodate variable conditions.
1. Punch a 5/16” diameter service hole in the flue outlet.
This sampling hole should be at least two flue diamet
ers above the breech, or elbow at the breech, but
ahead of the barometric damper.
2. Operate burner for approximately 5 to 10 minutes.
