Beckett CF 2500/ 3500 Dimension, Adjusting plate assembly Figure, Initial head position Figure

Instruction Manual – Model CF2500/CF3500 Oil Burner

Prepare the burner for start-up - continued

❏Z dimension

•Should be set per these instructions (see page 7). The top acorn nut (Figure 11, item d) should never be loosened once the Z dimension is initially set.

❏Adjusting plate assembly (Figure 11)

•Make sure spline nut (item b) and bottom acorn nut (item c) are loose.

Figure 11 – Adjusting plate initial setting, typical

d e f h b c g

3515

❏Initial head position (Figure 11)

•The indicator plate assembly (item e) markings correspond to head position settings.

•Slide the secondary adjusting plate (item f) toward the rear of the burner until the number on the indicator plate corre- sponds to the initial head setting given in Table 4 for the desired firing rate (high-fire).

•Figure 11 shows a typical example, with a head setting of

5.

•When the head position has been set, tighten the bottom acorn nut (item c) and the spline nut (item b).

❏Initial air settings (Figure 12)

•Loosen the screw holding the air adjusting plate (item m). Set the air to the desired low-firerate. (The numbers on this plate correspond to the approximate firing rate settings given in Table 5.)

•Rotate the air adjusting plate until the lower edge of the pointer is opposite the number from Table 5 corresponding to the desired low-fire rate.

•This initial setting should be adequate for starting the burner at low fire. Once the burner is in operation, the air setting will be adjusted for best performance as discussed later in this manual.

•The damper moves to high-fire position as the damper rod (item d) rotates the damper linkage arm (item f). You will adjust the setting of the damper linkage arm when setting the high-fire air as discussed on page 14 in Start the burner.

•Follow the procedures given later in this manual for fine tuning the air settings.

❏Set appliance limit controls

•Set the appliance limit controls in accordance with the appliance manufacturer's recommendations.

•Move the low-fire hold switch (not shown) to the “IN” position. This will hold the burner in low fire during initial start-up.

Legend

b Spline nut for securing nozzle line	f	Secondary adjusting
c Bottom acorn nut (for head adjust-		plate
ments	g	Primary adjusting
d Top acorn nut (for setting dim. Z only		plate
— do not loosen after setting Z)	h	Copper oil line from
e Indicator adjusting plate		oil valve to nozzle line

❏Prepare the fuel unit for air venting

•To vent air from one-pipe oil systems, attach a clear hose to the vent plug on the fuel unit. Provide a container to catch the oil. Loosen the vent plug.

•Vent the air as described under Start the burner, page 14.

Table 4 – Initial indicator adjustment plate settings (head position)

Approximate	Firing rate, gph
head settings	Tube “KP”	Tube “KM”/“KR”
0	--	--
1	--	17.00
2	--	17.50
3	17.00	18.00
4	17.50	18.50
5	18.00	19.00
6	18.50	20.00
7	19.00	21.00
8	20.00	28.00
9	21.00	32.00
10	25.00	35.00

12 Form 6104 BCF-35-R0699