Potterton NXR4 Installation, Operation & Maintenance Manual page 6

POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
NXR4
General
This boiler is NOT SUITABLE for installation in a
normally occupied area (i.e. kitchen)
A LIFETIME GUARANTEE is available on this boiler
please refer to our standard terms and conditions for
details.
The Potterton NXR4 is a cast iron sectional boiler
available in outputs from 320kW (9 – sectional
model) to 800kW (17 – section model). The heat
transfer surfaces of the NXR4 have been specially
designed to maximise the boiler efficiency and the
large combustion chamber
environmentally sound combustion reducing CO and
Nox emissions. Specially designed and prewired
control panels allow full boiler control and flow and
return manifolds have facilities to fit sensor pockets
for boiler management.
The NXR4 is suitable for running at variable low
temperatures under direct compensated control.
The boiler has match tested package burners,
available for Natural Gas, 35 Second & 28 Second
Oil. Dual Fuel options are also available. The
package burner is supported by the front waterway
section to which it is attached by hinges on one side
and locking nuts on the other. Hinge points are
interchangeable allowing for left or right hand door
opening by turning the door assembly through 180°
at the erection stage.
The NXR4 is suitable for use on fully pumped open
vented systems or a sealed system with a maximum
design pressure of 8-bar (116 p.s.i.).
The NXR4 is an overpressure type with 5-pass
reverse flame design. The first two passes are in the
combustion chamber the rest in the convection tubes
where turbulence to achieve high heat transfer is
generated by the extended surface area achieving
efficiencies of 92% (net), 86% (gross).
The NXR4 is constructed with BS1452 Grade220
cast iron heat exchanger, constructed in accordance
with EN303.1. The boiler package meets Gas and Oil
requirements of M&E3 and the burners EN767.
The waterway sections are joined by cast taper
nipples and secured with tie rods. The combustion
chamber is sealed by boiler cement and silicone.
The powder coated mild steel casings have a 50mm
fibre insulation in the casing plus a 50mm fibre wrap
around the castings, thus reducing fuel consumption
and emissions.
The NXR4 is supplied unassembled.
capacity ensures
Standard Supply
•
Unassembled cast
dependent on boiler output).
•
Smoke box, optimising baffles, flueway door,
combustion chamber door, burner adapter plate,
flanged flow and return connections.
•
Boiler wrap around insulation
•
Insulated casing
•
Cleaning brush
•
Flow manifold complete with sensor pocket ¾"
screw socket and plug
•
Eco – control panel
•
Burner
Controls
The NXR4 range is supplied as standard with an
integral control panel which is fitted with, hours run
meters, flue thermometer, on/off control and high/low
stats, limit stat, water stat, reset button, high
temperature warning light, mains on/off light and
fuse.
A 240V single phase supply is taken to the control
panel. A 415V three phase supply should be taken to
the burner motor connections.
Optional Extras
•
Volt free contacts
•
Sequence Controls
Shipping – Packaging
The boiler package is delivered unassembled on two
pallets with the burner separately either in a carton or
pallet.
Pallet 1
Unassembled sections and door.
Pallet 2
Casing pack, boiler accessories, boiler fittings, tie
rods, baffles, flow and return turrets and control
panel.
It is recommended that the manufacturer's trained
engineers should carry
commissioning, as this will make the LIFETIME
GUARANTEE valid, details on the rear of this
manual.
SECTION 2
PAGE 5
iron sections (number
out erection and