Nu-Way PO160, Installation & Maintenance Manual

Page: 6 / 56

PO Series General Information
Page B.2
IIIII
NTRODUCTION NTRODUCTION
NTRODUCTION NTRODUCTION NTRODUCTION
This handbook has been produced to enable users
to install, commission and use P Series burners
safely and efficiently. At each stage the conditions
that should be met and the adjustments and other
actions which should be carried out are detailed
and the locations of the various components and
adjustment mechanisms are identified. Where
appropriate, this information is supported by tables
and graphs.
Literature on the proprietary components used in
P Series burner systems is available on request.
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The P Series of fully automatic burner equipment
is offered for industrial and air heater applications.
This is a versatile range of fully modulating burners
with a turndown of 3:1.
P Series burners meet current test authority
requirements both in the UK and overseas.
P Series burners are designed for flange mounting
to the appliance. All components are pre-wired,
input and output circuits being grouped for ease
of connection to the power supply and to electrical
equipment on the burner head, air damper and
oil pumping and heating units.
Larger sizes of PO burners can be supplied with
air/steam oil atomisation in place of the usual
pressure jet.
This technique, for larger thermal ratings, reduces
emissions, increases turndown and prolongs oil
pump life because lower oil pressures can be used.
For more information contact Nu-Way.
Burner Designation
Each burner is described by a comprehensive code
that defines all the important parameters of each
individual burner and is an important point of
reference for burners in service. In addition to the
burner casing size and maximum power output,
the code is composed as shown in the Table on
Page B.6.
Burner Capacity
The burner output (based on the gross calorific
value) is shown on the Burner Specification Sheet
on Page C.2 Technical Details.
Fuel
The PO is available in two forms, to use distillate
or residual fuel oils.
Controls
The control panel, housed in a free-standing or
wall-mounted cabinet, is a purpose designed and
robustly constructed unit that complies with
relevant Standards and Codes of Practice and can
be tailored to individual customer requirements.
Depending on the burner specification, the control
panel incorporates such components as a burner
management sequence controller, a fuel selector
switch (for the dual fuel range), modulating control
gear, a starter for the combustion air fan, starters
for fuel pumps and boiler feed water pump, and
safety devices e.g. low and high water cut-out
relays.
Air for combustion can be adjusted to give
maximum efficiency. An air pressure switch
provides safe shutdown if the combustion air
supply becomes insufficient for complete
combustion.
A photo electric cell and automatic programming
control unit provide continuous flame supervision.
Operating Mode
P Series burners are all fully modulating offering a
standard turndown of 3 to 1.
To ensure efficient operation of any boiler, two
requirements are of paramount importance. The
air to fuel ratio must be kept to a minimum whilst
being sufficient for complete combustion and the
settings for this condition, once arrived at, are
accurately repeated. The temperature or pressure
of the boiler must be monitored by the control
system and the correct amounts of fuel and air fired
to achieve the set value, variations from this set
point must be minimised even when the load
changes.
Modulation By Electro-Mechanical Systems
P Series burners can be supplied with a Landis and
Staefa RWF40 modulating controller. This unit is
designed specifically for the control of boiler
temperature or steam pressure in oil- and gas-fired
heating plant.
The system comprises a reversible motor that is
coupled directly to the cam shaft of the modulating
unit. Two adjustable cams are mounted on this
shaft, one of which operates the air linkage and
the other, the modulating oil cam.