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18
COMMISSIONING - Page 18
Open Vented Systems
Remove the pump and flush out the system thoroughly with cold
water. Refit the pump. Fill and vent the system. Examine for leaks.
Sealed Systems
NOTE:
The system can be filled using a sealed system filler pump with a
break tank or by any other method approved by the Local Water
Authority. Refer to ‘THE SYSTEM’ section Page 8 in these
instructions, also B56798 1987.
Remove pump and flush out the system thoroughly with cold
water. Refit the pump. Fill and vent the system until the pressure
gauge registers 1.5 bar (21.5 lbf/in2). Examine for leaks. Raise the
pressure until the safety valve lifts. This should occur within ± 0.3
bar of the preset lift pressure of 3 bar. Release water to attain the
correct cold fill pressure, and set the indicator on the water gauge
to this value.
All Systems
Refit the fan assembly and reconnect the fan supply leads,
(polarity of the fan leads is not important).
The whole of the gas installation including the meter should be
inspected and tested for soundness and purged in accordance
with the recommendations of BS 6891.
Test pilot unions for gas soundness as follows:—
Turn boiler thermostat to the ‘O’ position.
Unplug the gas control valve supply lead from the control box and
plug it into the test socket adjacent to the boiler thermostat knob,
see FIG. 24.
Turn on gas at the gas service cock.
Ensure that the time control if fitted is in an ON condition, and that
the room and/or cylinder thermostats where fitted are set to high
temperatures.
Switch on the external electricity supply to the boiler.
Gas will flow to the pilot only. It will not be ignited as the ignition
system is de-energised.
Using a leak detection fluid, check pilot unions for gas soundness.
Turn off the external electricity supply and gas service cock.
Remove gas control valve plug from the test socket and
refit the plug into the socket on the left hand side of the control
box see FIG. 24.
Refit the combustion chamber front panel.
Fit the case door into position by lifting it onto the top hinge
brackets and secure it with the lower two fixing screws.
Remove the temporary label from the front of the casing, having
checked compliance with the information it contains.
First Lighting
WARNING:
Before lighting the boiler, ensure that the CASE
DOOR HAS BEEN CORRECTLY FITTED and that the sealing
strip fitted to the case door is forming a tight seal with the main
boiler casing. Before proceeding to light the boiler, check that the
external electricity supply to the boiler is switched off and that the
boiler thermostat is in the ‘0’ position.
Turn on the gas service cock.
Ensure that the pump and radiator isolating valves are open.
Ensure that the time control, if fitted is in an on condition, and that
the room and/or cylinder thermostats, where fitted are set to high
temperatures.
Switch on to the external electricity supply to the boiler.
After installation of the appliance, preliminary electrical system
checks must be carried out. The checks to be carried out are:-
A.
Earth Continuity
B.
Short Circuit
C.
Polarity
D.
Resistance to Earth
Refer to Fault Finding Chart FIG. 31
Turn the boiler thermostat on and to a high setting and after a
period of time the main burner will light, this can be observed
through the sight glass in the front cover of the boiler. The time
period can vary upwards of 45 seconds, depending on the amount
of air in the pipework.
Test for gas soundness around the boiler components using leak
detection fluid.
Turn the boiler thermostat to ‘0’.
NOTE:
There could be a delay in lighting if the control knob is switched
on and off and then on again rapidly.
SETTING AND CHECKING OF CONTROLS
With the controls cover removed.
Fit a pressure gauge to the pressure test nipple in burner supply
pipe. See FIG. 2.
Turn on the boiler thermostat and ensure that the main burner is
alight. Check that the burner pressure is in accordance with values
stated under TECHNICAL DATA.
The burner pressure is set to the maximum output at the factory.
If burner pressure adjustment is necessary proceed as follows,
referring to FIG. 26.
S.l.T. Valve - Remove the plastic cover from the valve and turn
the screw beneath clockwise to decrease the pressure or anti-
clockwise to increase the pressure.
White Rodgers Valve - Remove the brass cover screw from the
gas control valve and turn the screw beneath clockwise to
increase the pressure or anticlockwise to decrease the pressure.
