27
British Gas 100 & 125 RD2 -
Installation & Servicing
SERVICING
42 COMMISSIONING AND TESTING
WARNING.
Whilst effecting the required gas soundness test and purging air from the gas installation,
open all windows and doors, extinguish naked lights and
DO NOT SMOKE.
A.
ELECTRICAL INSTALLATION
1.
Checks to ensure electrical safety should be carried
out by a competent person.
2.
ALWAYS carry out preliminary electrical system
checks, i.e. earth continuity, polarity, resistance to
earth and short circuit using a suitable test meter.
B.
GAS INSTALLATION
1.
The whole of the gas installation, including the meter,
MUST be inspected and tested for soundness, and purged
in accordance with the recommendations of BS. 6891.
2.
Purging air from the gas installation may be expedited by
loosening the union on the gas service cock on the boiler
and purging until gas is detected.
3.
Retighten the union and check for gas soundness.
43 INITIAL LIGHTING
LEGEND
A.
Gas control valve.
B.
Burner pressure test point.
C.
Main burner pressure
adjuster.
D.
Inlet pressure test point.
E.
Gas service cock.
F.
Boiler thermostat knob.
G.
'Burner 'On' neon.
H.
Overheat thermostat reset
button.
J.
Lock out reset button.
TO LIGHT THE BOILER
1.
Check that all the drain cocks are closed and any valves in
the flow and return are open.
2.
Check that the gas service cock [E] is OPEN and the boiler
thermostat [F] is OFF.
3.
Slacken the screw in the burner pressure test point [B] and
connect a gas pressure gauge via a flexible tube.
4.
Switch the electricity supply ON and check that all external
controls are calling for heat.
5.
Press the reset button (J) and the overheat thermostat reset
button (H).
6.
Set the boiler thermostat knob [F] to position 6. The fan will
start. After the fan has run for a few seconds the igniter will
be energised. The gas valve will open and the main burner
will then cross-light smoothly. The boiler may attempt 5
ignitions. If this fails, the boiler requires to be manually reset
by pressing the reset button. If this sequence does not occur,
refer to the Fault Finding section.
7.
Test for gas soundness around ALL boiler gas components
using leak detection fluid.
8.
Operate the boiler for 10 minutes to stabilise the burner
temperature.
9.
The boiler is preset at the factory to its nominal rating. If
adjustment is necessary remove the sealing cap and turn
the adjusting screw [C] clockwise to increase/anticlockwise
to decrease the pressure until the required burner pressure
is achieved.
Refit the sealing cap.
10.
Set the boiler thermostat to (F) OFF.
11.
Remove the pressure gauge and tube. Retighten the sealing
screw in the pressure test point.
12.
Turn ON and check for gas soundness at the pressure test
point.
13.
Refit the lower front panel and secure with the 2 fixing screws.
14.
Finally stick the appropriate British/Scottish Gas logo
(supplied) in the marked area at the top LH corner of the
controls panels door.
INST
ALLA
TION
Содержание British Gas 100 RD2
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