31
Response 80 / 100 / 120
- Installation
44
INITIAL LIGHTING
The illustration is shown with the control & front panel removed.
The illustration is shown with the control door removed.
LEGEND
A 'Mains on' neon.
B 'Burner on' neon.
C Boiler (on/off) switch.
D Heating switch.
E Burner pressure test point.
F
Signal pressure test point (Lo).
G Signal pressure test point (Hi)-fan.
H Overheat thermostat reset button.
J
Gas service cock.
K Heating control knob.
L
Pressure gauge.
M Programmer display (optional).
6. Check that the gas service cock (J) is ON.
7. Switch the electricity supply ON and check that all external
controls are calling for heat.
8. Set the boiler (on/off) switch (C) and the heating switch (D)
to 'ON'. Following a pre-purge period the gas control
solenoid valve should open and the spark commence,
continuing until the burner is established.
9. Check that the burner lights smoothly and that the 'Burner
on' neon (B) illuminates. The boiler will attempt 4
ignitions. If the burner does not light after the 4 attempts,
turn the on/off switch to OFF, wait for 5 seconds then try
again. If the burner still does not light refer to the 'Fault
Finding' section.
10. Test for gas soundness around ALL boiler gas
components, using leak detection fluid.
11. Operate the boiler for 10 minutes to stabilise the burner
temperature.
12. The burner pressure is regulated by the gas valve
according to the air flow produced by the fan.
It is NOT
user-adjustable. Any interference to sealed settings on
the gas valve will adversely affect operation and render
our warranty void.
However you should check that the inlet pressure (see
Frame 36) is at least 20 mbar when the boiler is firing.
13. Set the boiler (on/off) switch (C) to OFF.
14. Remove the pressure gauge and tube. Replace the
sealing screw in the pressure test point. Ensure a gas
tight seal is made.
15. Refit the boiler front panel, using the screw previously
removed.
16. Switch the boiler on again.
IMPORTANT.
Before lighting the boiler you should note especially that:
a.
To extract maximum heat from the boiler, a 2 minute
pump overrun period occurs after each heating cycle
(unless immediately followed by DHW draw off).
b.
During this period the boiler
will not restart for CH,
even if the room thermostat is calling - this prevents
short cycling and thus is more efficient.
c.
The 2 minute period can be curtailed by running a hot
tap for a few seconds or turning the mains off briefly.
d.
At the end of each period of DHW draw-off the pump
will run for few seconds, to extract the residual heat
from the heat exchanger.
e.
Provided that the mains supply switches are left ON,
the pump will run for at least 30 seconds each day
(even if neither CH nor DHW is in use), as a self-
checking measure.
1. Check that all the drain cocks are closed and any valves
in the flow and return are open. Open the dust cap on the
auto air vent (see Frame 1) by one turn.
2. Check that the system has been filled and pressurised
(see Frame 4) and that the boiler is not air locked.
3. Check that the overheat thermostat (
H
) is calling for heat -
press the reset button.
4. Remove boiler front panel. Refer to Frame 48.
5. Remove the screw in the burner pressure test point (E) -
located behind the lower front panel - and connect a gas
pressure gauge via a flexible tube.
Be sure to select the correct pressure test point. Refer to
Tables 2 & 3 on page 3 for pressures.
INST
ALLA
TION
INSTALLATION
