Beckett Burner CF375 Manuel D’Utilisation

High Effi ciency/Positive  Pressure Appliances; also 
vary from traditional appliances (see manufacturer’s 
recommendations).

 Follow these four steps to properly adjust the burner:

Step 1:  Adjust the air shutter/band until a trace of smoke 

is achieved.  

Step 2:  At the trace of smoke level, measure the CO

2 

(or O

2

) . This is the vital reference point for further 

adjustments.  Example: 13.5% CO

2 

(2.6% O

2

)

Step 3:  Increase the air to reduce the CO

2

 by 1.5 to 2 

percentage points. (O

2

 will be increased by approxi-

mately 2.0 to 2.7 percentage points.)   Example: Re-
duce CO

2

 from 13.5% to 11.5% (2.6% to 5.3% O

2

).  

Step 4:  Recheck smoke level. It should be Zero.

This procedure provides a margin of reserve air 
to accommodate variable conditions.
If the draft level has changed, recheck the 
smoke and CO

2

 levels and readjust the burner, 

if necessary

Once combustion is set, tighten all fasteners on air band, 
air shutter and escutcheon plate.

Start and stop the burner several times to ensure satis-
factory operation. Test the primary control and all other 
appliance safety controls to verify that they function ac-
cording to the manufacturer’s specifi cations.

Check the breech draft pressure against the appliance 
manufacturer’s recommended setting (typically + 0.1” 
W.C.). If the breech pressure is higher or lower than rec-
ommended level, adjust the appliance breech damper to 
achieve the specifi ed setting.  Recheck the smoke and 
CO

2

 levels.  Adjust burner air if necessary.

y

3.

y

y

4.

5.

6.

Maintenance and Ser-

vice

Do not tamper with the burner or controls or make 
any adjustments unless you are a trained and qualifi ed 
service technician.
To ensure continued reliable operation, a qualifi ed 
service technician must service this burner annually.
More frequent service intervals may be required in 
dusty or adverse environments.
Operation and adjustment of the burner requires 
technical training and skillful use of combustion test 
instruments and other test equipment.

y

y

y

y

Annual service 

Have the burner inspected, tested and started at least annually 
by a qualifi ed service technician. This annual test/inspection 
should include at least the following:

Replace the oil supply line fi lter. The line fi lter cartridge 
must be replaced to avoid contamination of the fuel unit 
and nozzle.
Inspect the oil supply system. All fi ttings should be leak-
tight. The supply lines should be free of water, sludge and 
other restrictions.
Remove and clean the pump strainer if applicable.
Replace the nozzle with the exact brand, pattern, gph, fl ow 
rate and spray angle.
Clean and inspect the electrodes for damage, replacing 
any that are cracked or chipped.
Check electrode tip settings. Replace electrodes if tips are 
rounded.
Inspect the igniter spring contacts.
Clean the cad cell len’s surface, if necessary.
Inspect all gaskets. Replace any that are damaged or would 
fail to seal adequately.
Inspect the combustion head and air tube. Remove any 
carbon or foreign matter. Replace all damaged units with 
exact parts.
Clean the blower wheel, air inlet, air guide, burner hous-
ing and static plate of any lint or foreign material.
If motor is not permanently lubricated, oil motor with a 
few drops of SAE 20 nondetergent oil at each oil hole. 
DO NOT over oil motor. Excessive oiling can cause mo-
tor failure.

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