26
British Gas RD1
-
Installation & Servicing
INSTALLATION
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 (B) is OPEN and the boiler
control knob (D) is OFF.
3. Fitting the Boiler Casing
The boiler casing must be refitted with the controls
support casing attached for alignment purposes. Lift the
boiler casing up to the boiler assembly, with the casing
top angled forward. Hook the top edge of the boiler
casing into the channel on the top of the boiler assembly.
Swing the bottom of the casing down and secure with the
2 captive screws.
The casing must seat correctly and compress the sealing
strip to make an airtight joint.
Visually check the side seals but, if side clearances are
limited, then check that the top and bottom edges of the
casing are correctly located.
If the Sealed System Unit is fitted remove the unit
casing in order to inspect the top casing seal.
To gain access to the gas valve:
a. Remove the controls support casing. Release the
controls support front fixing screws 3 turns only.
Remove the pod by pulling it forward to disengage
from the keyhole slots.
b. Remove the control box securing screws and swing it
down into the servicing position. See diagram B,
Frame 41.
LEGEND
A Sightglass.
B Gas service cock.
C Inlet pressure test point.
D Control knob
E Main burner pressure
adjuster.
F
Burner pressure test point.
H Boiler reset switch.
J
Overheat 'stat reset button.
40 INITIAL LIGHTING
4. Slacken the screw in the burner pressure test point (F) and
connect a gas pressure gauge via a flexible tube.
5. Swing the control box back into its working position.
6. Switch the electricity supply ON and check that all external
controls are calling for heat.
7. Press the boiler reset switch (H) and the overheat
thermostat reset button (J).
8. Set the boiler control knob (D) to maximum. The fan will
start. After the fan has run for a few seconds the gas valve
should open and the ignition commence. The main burner
will then cross-light smoothly. The boiler will attempt 5
ignitions. If the boiler does not light, press the reset switch
(H) and the ignition sequence will be repeated. If the boiler
still does not light, refer to the 'Fault Finding' section.
9. Test for gas soundness around ALL boiler gas components
using leak detection fluid.
10. Operate the boiler for 10 minutes to stabilise the burner
temperature.
11. The boiler is preset at the factory but if any adjustment is
necessary proceed as follows:
a. Set the boiler control knob to OFF.
b. Switch the electricity supply OFF.
c. Swing the control box down into the servicing position.
d. Remove the main burner adjuster cover.
e. Turn the adjusting screw
clockwise to INCREASE the
pressure, or
anticlockwise to DECREASE the pressure.
f. Swing the control box back into its working position.
g. Switch the electricity supply ON and check the new
setting pressure.
12. If necessary repeat steps 11 a to g until the correct burner
pressure is achieved. Record this value in the Benchmark
log book.
13. Set the boiler control knob to OFF.
14. Switch the electricity supply OFF.
15. Swing the control box down into the servicing position.
16. Refit the main burner pressure adjuster cover.
17. Remove the pressure gauge and tube. Retighten the
sealing screw in the pressure test point. Ensure a gas tight
seal is made.
18. Swing the control box back into its working position and
secure.
INST
ALLA
TION
