Burnham LE L7248 User Manual

Page 15

TABLE : BECkETT AFG BURNER

C. Attach a plastic hose to fuel pump vent fitting and

provide a pan to catch the oil.

D. REMOVE GAUGE PORT PLUG from fuel pump

and install pressure gauge.

E. REMOVE FLAME PLUG IN SWING DOOR.

START OIL BURNER

A. Open vent fitting on fuel pump.
B. TURN ‘ON’ BURNER service switch and allow

burner to run until oil flows from vent fitting in a

SOLID stream without air bubbles for approximate-

ly 10 seconds.

C. Close vent fitting and burner flame should start

immediately after pre-purge is complete. Pre-purge

prevents burner flame until 10 seconds has elapsed

after initial power is applied to burner. During pre-

purge, the motor and ignitor will operate but the oil

valve will remain closed. Refer to Oil Primary

Control Instructions for more details.

ADJUST OIL PRESSURE

A. Locate oil pressure adjusting screw and turn screw

to obtain the oil pressure indicated in Tables 6 and

6A.

B. DO NOT REMOVE PRESSURE GAUGE until

later.

10.

OTHER ADJUSTMENTS

A. ADJUST THE AIR BAND AND/OR AIR SHUT-

TER

Beckett Burners:
Adjust air supply by loosening lock screws and

moving the air shutter and if necessary the air band.

Refer to Table 6 for preliminary settings.

B. ADJUST DRAFT REGULATOR for a draft of 0 to

maximum of -.03" (water gauge) in the breeching

after chimney has reached operating temperature

and while burner is running. Burner will operate

with a positive draft over fire and zero draft in the

breeching. Adjust Draft Regulator such that

maximum draft of -.03" is reached in coldest

weather.

C. READJUST AIR BANDS on burner for a light

orange colored flame. Use a smoke tester and adjust

air for minimum smoke (not to exceed #1) with a

minimum of excess air. Make final check using

suitable instrumentation to obtain a CO

of 11.5 to

12.5%. These settings will assure a safe and

efficient operating condition. If the flame appears

stringy instead of a solid fire, try another nozzle of

the same type. Flame should be solid and compact.

After all adjustments are made recheck for a draft

of zero to -.03" (water gauge) in breeching.

D. TURN “OFF” BURNER and remove pressure

gauge. Install gauge port plug and tighten. Start

burner again.

E. CAD CELL LOCATION AND SERVICE
The burner is supplied with a cadmium sulfide flame

detector mounted at the factory, mounted on the

bottom of the transformer. See Figure 16. To

service cad cell or to replace the plug in portion,

swing open the transformer. After service is

complete, be sure to fasten down the transformer.

F. FLAME FAILURE
The LE boiler controls operate the burner automati-

cally. If for unknown reasons the burner ceases to

fire and the reset button on the primary control has

tripped, the burner has experienced ignition failure.

Boiler

Model

Firing Rate

(GPH)

Burner

Model

Nozzle

Settings

Air Gate

Pump Pressure

Turbulator

LE1

0.60

Delavan 0.50 x 60°A

2.8

145

0.5

LE2

1.00

Delavan 0.85 x 60°A

3.0

1.0

LE3

1.25

Delavan 1.00 x 60°A

3.5

3.0

TABLE A: RIELLO BURNER SPECIFICATIONS

Boiler

Model

Firing

Rate

(GPH)

Head

Static

Disc

Nozzle

Settings

Manufacturer GPH Angle

Type

Air

Shutter

Air

Band

Head

Pump

Pressure

(PSIG)

LE1

0.60 *

MB(L1) 3-3/8U

Hago or

Delavan

0.50

70°

N/A

140

LE2

1.00

0.85

60°

N/A

140

LE3

1.25 +

MD(V1) 2-3/4U

Delavan

1.10

45°

1.5

140

Settings are approximate and must be verified by Smoke and Carbon Dioxide measurement. Readjust where necessary.
See Text of the Manual.
* Install low firing rate baffle for 0.60 GPH firing rate.
+ Do not change the firing rate of the 1.25 GPH burner.