Technical data

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 BS 6798 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/in
2
). 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.
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 BS6891.
Test pilot unions for gas soundness as follows:— Turn boiler
thermostat to the ‘0’ 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 electicity 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.
ENSURE THAT A GOOD SEAL IS OBTAINED
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 the external electricity supply to the boiler. In the
event of an electrical fault after installation of the appliance,
preliminary electrical system checks must be carried out as
described in the BG multimeter instruction book. 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.
WHITE RODGERS GAS CONTROL VALVE
Remove the brass cover screw from the gas control valve
and turn the screw beneath, clockwise to increase the
pressure or anti-clockwise to decrease the pressure.
HONEYWELL GAS CONTROL VALVE
Turn the pressure adjustment screw anti-clockwise to
increase the pressure or clockwise to decrease the pressure.