Beckett CF375 - Manual (Page 5)

5 CF375 Burner Manual
Fuel supply Nozzle pressure
Section: Pre-Installation Checklist
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 allowable suction pressure.
If fuel supply is level with or higher than fuel unit —
When the fuel unit is not required to lift the oil, the
installation 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.
Oil Supply Pressure
Control Required
Damage to the pump, fi lter or other component seals
could cause possible oil leakage and potential fi re
hazard.
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. y
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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.
Electrical supply
Verify that the power connections available are correct
for the burner. Refer to Figure 1. All power must be
supplied through fused disconnect switches.
Correct Nozzle and Flow
Rate Required
Incorrect nozzles and fl ow rates could
result in impaired combustion, under-
fi ring, over-fi ring, sooting, puff-back of
hot gases, smoke and potential fi re or
asphyxiation hazards.
Use only nozzles having the brand, fl ow rate (gph),
spray angle and pattern specifi ed by the appliance
manufacturer. 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 140 psig = 2.37 gph.
For typical nozzle fl ow rates at various pressures
see Table 1. y
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Figure 1 – Typical Nameplate
R.W. Beckett Construction &
Setting Data
R.W. Beckett Specifi cation
Number and Revision
Boiler Manufacturer and
Model, When Applicable
Additional Codes
General Model Information
Serial Number, Including Date Code
Rating Information
Approval Agency Symbols
Primary Group and Fuel