Installation; General; Fitting To The Appliance; Electrical - Nu-Way XGN Series Handbook

I
NSTALLATION

General

Check that the burner is appropriate for the
appliance rating. Detailed burner performance
data is given on pages 23 to 27.

Fitting to the Appliance

If the burner is to be fitted to a new packaged unit,
refer to the manufacturers recommendations.
If the burner is to be used with an existing appliance
prepare the mounting flange as detailed on page
6.
Ensure the joint between appliance and burner is
effectively sealed with the gasket provided.
Unless the appliance manufacturer specifies
extensions, the flame tube should be flush with
the inner face of the appliance combustion
chamber.

Electrical

The main Electrical supplies to the burner must
have a means of disconnection which has a contact
separation of at least 3mm in all poles.
Connect the electrical supply to the burner
observing all applicable IEE Regulations.
Connect all of the applicable external auxiliary
controls.
Refer to the electrical supply specifications and
connection diagrams shown on page 8.
Ensure that adequate earthing is provided for
motor supply.
If supplied as a packaged appliance/burner unit
refer to the manufacturers instructions.
B A C
URNER IR ONTROLS
A motorised air flap controls the air for combustion.
It is located inside the air inlet, see page 6.

Air Diffuser

The air diffuser creates a pressure drop over the
burner head to ensure good fuel/air mixing and
flame stability.

Air Pressure Switch

The air pressure switch is required to prove
adequate air flow throughout the burner operating
cycle. Air flow failure at any stage after pre-purge
will result in a lockout, failure during pre-purge will
result in four restarts before a lockout.
B G
URNER

Gas Nozzle

The holes in the gas nozzle are designed to suit
the output of the particular burner model and gas
type being used.

Gas Pressure Switch

The low gas pressure switch is located between
the two gas valves and has two functions: -
To monitor the gas pressure during the burner
•
operating cycle. A low gas pressure will result
in the safe shutdown of the burner.
The check the gas leak integrity of the valves.
•
I
NTEGRATED
The XGN burner comes complete with an

integrated Valve Proving System.

A leakage test is performed after every controlled
shutdown.
A leakage test is performed before the burner is
started after a power failure or fault reset.

Functional sequence

After a controlled shutdown, the second main valve
is closed after a 2-second delay. The pressure in
the test section is thus evacuated and the gas
pressure switch opens. A test of the first main valve
(V1) commences and during the first preset test
period. The gas pressure switch must remain in
the open position, otherwise the burner will
lockout and a fault code for 'valve 1 leaking' will
be displayed
At the completion of the first test period the first
gas valve is momentarily opened and the test
section is pressurised with gas, the gas pressure
switch closes. A test of the second main valve (V2)
commences during the second preset test period.
The gas pressure switch must remain closed,
otherwise the burner will lockout and a fault code
for 'valve 2 leaking' will be displayed.
At the end of the second test period the valve
proving is complete.
XGN Handbook
C
AS ONTROLS
V P
ALVE ROVING
S
YSTEM
Page 11