Beckett Burner CF375 사용자 설명서

Combustion air supply

The burner requires combustion air and ventilation air for 
reliable operation. Assure that the building and/or com-
bustion air openings comply with National Fire Protec-
tion Standard for Oil-Burning Equipment, NFPA 31. For 
appliance/burner units in confi ned spaces, the room must 
have an air opening near the top of the room plus one near 
the  fl oor, each with a free area at least one square inch 
per 1,000 Btu/hr input of all fuel burning equipment in 
the room. For other conditions, refer to NFPA 31 (CSA 
B1139-M91 in Canada).

If there is a risk of the space being under negative pres-
sure or of exhaust fans or other devices depleting available 
air for combustion and ventilation, the appliance/burner 
should be installed in an isolated room provided with out-
side combustion air.

 Clearances

With the burner installed in the appliance, there must be 
adequate space in front of and on the sides of the burner 
to allow access and operation. Verify that the clearance 
dimensions comply with all local codes and with the ap-
pliance manufacturer’s recommendations.

Fuel supply

The fuel supply piping and tank must provide #1 or #2 fuel 
oil at pressure or vacuum conditions suitable for the fuel 
unit (oil pump) on the burner. Refer to fuel unit literature 
in the literature envelope in the burner carton to verify al-
lowable suction pressure.

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If fuel supply is level with or higher than fuel unit —

When the fuel unit is not required to lift the oil, the instal-
lation is usually suitable for either a one-pipe or two-pipe 
oil system. The oil pressure at the inlet of the fuel unit 
must not exceed 3 psig.
Refer to the Mount the Burner Section of this manual for 
one-pipe or two-pipe fuel supply installation instructions. 

If fuel supply is below the fuel unit —

Use a two-pipe oil system when the fuel unit must lift the 
oil more than 8 feet if burner is equipped with a B fuel 
unit. The return line provided by the two-pipe system is 
needed to purge the air from the fuel lines and minimize 
the likelihood of air-related problems during operation.

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The oil supply inlet pressure to the fuel unit cannot 
exceed 3 psig. 
Ensure that a pressure-limiting device is installed in 
accordance with the latest edition of the NFPA 31.

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Nozzle pressure

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The fuel unit nozzle port pressure is factory set at 140 
psig. Some original equipment manufacturer burner appli-
cations may call for a lower pressure to obtain a required 
fi ring rate.  Do not change this pressure unless directed to 
do so by the appliance manufacturer.

Vent system

The fl ue gas venting system must be in good condition and 
must comply with all applicable codes.

Electrical supply

Verify that the power connections available are correct for 
the burner. All power must be supplied through fused dis-
connect switches.

Verify burner components —

Burner, Model CF375
Air tube assembly 
Mounting fl ange kit
Oil nozzle, per Table 1 — Only 45° to 70° solid pattern 
nozzles are recommended unless otherwise specifi ed  by 
appliance manufacturer. (See specifi c  appliance  recom-
mendation sheet or refer to OEM Spec Guide).  Find the 
required fi ring rate in the 150 psig column (factory-set fuel 
unit pressure). Select the corresponding nozzle from col-
umn 1 (Rated gph @ 100 psig).

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Use only nozzles having the brand, fl ow rate (gph), spray 
angle and pattern specifi ed by the appliance manufac-
turer. 
Follow the appliance manufacturer’s specifi cations for 
the required pump outlet pressure for the nozzle, since 
this affects the fl ow rate. 

Nozzle manufacturers calibrate nozzle fl ow rates at 
100 psig.
This burner utilizes pressures higher than 100 psig, so 
the actual nozzle fl ow rate will be greater than the gph 
stamped on the nozzle body. (Example: A 2.00 gph 
nozzle at 150 psig = 2.45 gph.

For typical nozzle fl ow rates at various pressures 
see accompanying chart.

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