Important Safety; Emergency Instructions - Potterton NXR4 Installation, Operation & Maintenance Manual

SECTION 5
PAGE 26
7 The safety valve should be checked to ensure that
it is of the correct size and pressure.
8 The cold feed and open vent sizes should be
checked.
9 Ensure the burner fitted to the boiler is of the
correct specification and size for the boiler and
suitable for the fuel supply available (see burner
card enclosed with this manual).
10 The burner blast tube has been sealed to the door
refractory and the boiler door seal is correct.
Following completion of the above checks the burner
should be commissioned in accordance with the
burner manufacturers handbook provided with the
burner. The commissioning form provided at the back
of this manual MUST be completed and returned to
Potterton Commercial at the address on the back
page.
Typical combustion figures are:
CO - Gas: 9 – 9.5%
2
CO - Gas: 0 – 100ppm Oil: 0 – 1 Smoke
Flue gas temperature (taken at 600mm from the flue
outlet on a clean boiler) should be within the range of
160 – 200°C.
IMPORTANT – SAFETY
It is essential that the following instructions and
adjustments are carried out by a qualified engineer
who is experienced in blown gas/pressure jet burner
commissioning.
In the UK it is a legal requirement that when working
on blown gas appliances the engineer must be
CORGI registered. The manufacturer cannot be held
responsible for any consequential damage, loss or
personal injury as a result of customers failing to
follow these instructions, or as a result of misuse.

EMERGENCY INSTRUCTIONS

The burners are designed and constructed to meet all
of the essential requirements of the GAS APPLIANCE
DIRECTIVE 90/396/EEC
circumstances should not give occasion to any
hazardous conditions. If such a condition should occur
during commissioning or subsequent use of this
product, be it a fault of the burner, the boiler or of any
instrument, machine or service in the proximity of the
burner then the GAS and ELECTRICITY supply to the
burner should be IMMEDIATELY ISOLATED until
such time that the fault has been investigated and
rectified.
POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
Oil: 12 – 13%
and under normal
The commissioning of the appliance can be split into
three main categories these being listed below.
Pre-Commissioning Dry Run
This will enable the checks on the safety controls to
be done and should include:
Air Control Devices
Control Devices
Control Box
Soundness Testing
This is to check the soundness of the gas train and
valves and should include:
Main Gas Pressure Governor
Gas Valve Closure
Commissioning – Live Run
This will enable the burner to be commissioned fully
and should include:
Checking Inlet Pressures
Checking Pipework
Checking Pilot Flame
Checking Low/High Flame
Setting Gas Rates
Setting Combustion Figures
Checking Flame Signals
Pressure Switch Settings
IMPORTANT: After each adjustment, gas flow rate
and flue gas analysis should be re-checked.
ALWAYS use approved test equipment (continually
monitoring electronic equipment is recommended).
NEVER rely on a visual inspection of the flame as a
guide to combustion quality.
Following/during commissioning of the burner unit the
following additional checks should be carried out.
1 Operation of the control, high/low and high limit
thermostats should be checked for correct
operation.
2 The flue draught available at the appliance flue
outlet should be checked under all operating
conditions (hot and cold) and should be within the
boiler operating parameters.
3 Checking of lockout of burner on flame failure.
OIL – Cover the photocell.
GAS – Disconnect the ionisation probe in the
control box (see manufacturer's instructions).
4 Shut down of the boiler plant by external controls
does not cause a hazardous condition and pump
overrun is provided to remove residual heat from
the boiler.
NXR4