dunphy TD - Pre-Commissioning

Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 69 of 165 TD/TAD4 Manual Rev 4
t
s
is the safety time in seconds (s):
Q
s
is the maximum start gas heat input expressed as a percentage of the main gas rate
This approximates to an ignition rate of less than one third of the maximum firing rate.
If the burner is fitted with a separate pilot, the start gas heat input of the ignition burner must not
exceed the value given by the equation:
t
s
x Q
s
≤ 150
where:
t
s
is the safety time in seconds (s):
Q
s
is the maximum start gas heat input expressed as a percentage of the main gas rate
7.3 Pre-commissioning
Note: The following tests must be carried out before commissioning is started.
 Check that the appliance has been filled to the correct level
 Check that the appliance isolating valves are fully open.
 Where fitted, check that the flue damper is locked in the open position.
 Check that the flue-draught stabiliser moves freely
 Check that the gas supply is guaranteed and is at the correct pressure.
 Check that the gas meter is the correct size.
 Ensure that a manual gas isolation valve is positioned as close as possible to the burner and
that all gas pipe work is adequately supported.
 Check that the external electrical connections are in accordance with the appliance
manufacturers wiring instructions.
 Make certain that both fuel supplies and electrical supplies have been isolated.
 Ensure that all gas, oil and electrical connections are tight as connections may come loose
during transportation.
 Check the electrode gap to be 3mm at the narrowest point of the ignition electrode (twin)
and the tip of gas ignition electrode is 3mm away from the gas nozzle outlet.
 Set the firing rate control switch to `low fire` to ensure that the burner will remain at low
fire after light-up.
 Hot water boilers - check operation of the control and limit thermostats and that the boiler
has been filled with water.
 Steam boilers - confirm the operation of the boiler feed pump and switch, and check that
the water level controls are working.
After the initial firing of the boiler, do not leave the unit operating in an unmanned boiler
house unless the boiler on/off control has been operated and set at a suitable figure and the
flame failure system on the burner has been checked.