30
icos
-
Installation & Servicing
INSTALLATION
nm8122
A
D
B
C
E
F
G
J
H
L
K
41 INITIAL LIGHTING
LEGEND
A
On/Off switch.
B
Thermostat knob.
C
'Burner On' neon.
D
Reset button.
E
Injector pressure test point.
F
Inlet pressure test point.
Note.
Boiler is shown with the front panel and sealing panel removed.
1.
Check that the system has been filled and that the
boiler is not air locked.
Note.
It is important the burner is not operated before the system
is fully vented of air. If it is necessary to operate the system
pump to assist venting of the air this must be done with the
gas service cock turned off.
2.
Check that all drain cocks are closed and any valves in
the flow and return are open.
3.
Check the electrical supply is off.
4.
Ensure the boiler sealing panel is fitted.
5.
Check the gas service cock is open.
6
. Check that the boiler on/off switch (A) is OFF
7.
Slacken the screw in the inlet pressure test point (G)
and connect a gas pressure gauge via a flexible tube.
8.
Switch the electricity supply ON and check all external
controls are calling for heat.
9.
Set the boiler thermostat knob (B) to position 6 and
switch the boiler on/off switch (A) to ON. The boiler
control should now go through its ignition sequence
until the burner is established.
10.
If the boiler does not light after 3 attempts the fault
codes
L' 'F'
will be displayed. Press the reset button (D);
the boiler will then repeat its ignition sequence. When
the burner is established the WHITE burner ON neon
(C) will be permanently illuminated
11.
Ensure that with the boiler operating the dynamic gas
pressure is able to obtain maximum output. Refer to
Table 2.
N.B.
The principle of the 1:1 gas valve ensures that the
icos HE
range is able to deliver it’s full output at inlet
pressures down to 14mb. However if dynamic
pressures below 20mb are experienced ensure this is
adequate for
ALL
other gas appliances in the property.
IMPORTANT.
The gas input to the burner 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.
12.
Switch OFF the boiler on/off switch.
13.
Remove the pressure gauge and tube. Tighten the
sealing screw in pressure test point. Ensure a gas tight
seal is made.
14.
Refit the boiler front panel and bottom panel.
THE DISPLAY
The user control has one neon and one display to
inform the user about the status: the display will show
the status of the boiler and the neon will show the
status of the flame. If no flame is detected the neon is
blinking. When the flame is detected the neon will be
lit permanently.
Below is a list with display function in normal
operation.
Standby. No demand for heat present.
Boiler is active for central heating.
Boiler is in lockout for a specific error. The display
will be blinking, alternating with a number or letter
to show which error is detected.
Boiler is in lockout for a specific error. The display
will be blinking, alternating with a number or letter
to show which error is detected.
Boiler frost protection. Boiler will fire when
temperature is less than 3 degrees.
G
Gas service cock.
H
Overheat thermostat.
J
Control thermistor.
K
Spark generator.
L
Dry Fire Thermostat.
INST
ALLA
TION
202414-6.pmd
19/02/2008, 13:07
30
