Beckett Burner CF375 Manuel D’Utilisation

Install two high-quality shut-off valves in accessible 
locations on the oil supply line. Locate one valve close 
to the tank. Locate the other valve close to the burner, 
upstream of the fuel fi lter.

Burner fuel fl ow

One-pipe systems – See Figure 7 for the fuel fl ow path.

Figure 7 is based on type B fuel unit.
Oil supply connects to one of the fuel unit inlet ports.

Two-pipe systems – See Figure 8 for the fuel fl ow paths 
for two-pipe oil systems.

Figure 8 is based on type B fuel unit .
Oil supply connects to one of the fuel unit inlet ports. 
Oil return connects to the fuel unit return port. (Install 
the by-pass plug in the fuel unit for two-pipe sys-
tems.)

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Fuel unit 

model number

Gearset capacity 

(gallons per hour)

17

17

20

21

25

125-200 psig

125-200 psig

3502

125-200 psig

125-200 psig

3503

Nozzle pressure – The fuel unit nozzle port pressure 
is factory set at 140 psig. Some original equipment 
manufacturer burner applications 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.

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Legend

a   Return port
b   Nozzle port
c   Oil valve
d   Nozzle & adapter

g   Inlet port
k   Return line to oil tank
p   Air bleed valve 

Wire the burner 

— R7184

Disconnect electrical power before installing or servic-
ing the burner.
Provide ground wiring to the burner, metal control en-
closures and accessories. (This may also be required to 
aid proper control system operation)
Perform all wiring in compliance with the National 
Electric Code ANSI/NFPA 70 (Canada CSA C22.1).

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Install the burner and all wiring in accordance with the National 
Electrical Code and all applicable local codes or requirements.

Wire the burner in compliance with all instructions provided by 
the appliance manufacturer. Verify operation of all controls in 
accordance with the appliance manufacturer’s guidelines.

S

1.  Standby — The burner is idle, waiting for a call for heat. 

When a call for heat is initiated, there is a 2- to 6-second 
delay while the control performs a safe start check.

2.  Valve-on delay — As applicable, the ignition and motor are 

turned on for a 15-second prepurge.

3.  Trial for ignition (TFI) — The fuel valve is opened, as ap-

plicable. A fl ame should be established within the 15-sec-
ond lockout time (30-second lockout time is available).

4.  Lockout — If fl ame is not sensed by the end of the TFI, the 

control shuts down on safety lockout and must be manu-
ally reset. If the control locks out three times in a row, the 
control enters restricted lockout. Call a qualifi ed service 
technician.

5.  Ignition carryover — Once fl ame is established, the igni-

tion remains on for 10 seconds to ensure fl ame stability. It 
then turns off.

6.  Run — The burner runs until the call for heat is satisfi ed. 

The burner is then sent to burner motor-off delay, as ap-
plicable, or it is shut down and sent to standby.

Standby

Trial for

ignition

Lockout

Recycle

Run

Ignition

carryover

Motor-off

delay

(postpurge)

Valve-on

delay