Gas Supply - IDEAL icos system HE15 Installation And Servicing

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43 INITIAL LIGHTING - continued
13. 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.
14. If the boiler does not light after 3 attempts, fault code
will be displayed. Press the reset button (E) and the
boiler will repeat its ignition sequence.
When the burner is established the WHITE 'Burner On'
neon (D) will be illuminated and the LED display will
show status .
15. Ensure that with the boiler operating the dynamic gas
pressure is able to obtain maximum output. Refer to
Table 2.
44 GENERAL CHECKS
Make the following checks for correct operation:
1. Ensure that the external controls are calling for heat.
After ignition the display should read:
white neon on.
2. Gas Rate
Check the boiler gas rate when the boiler is at full
output checked at the gas meter, with no other
appliance in use.
Refer to Table 2 for gas rates.
3. Set the external controls to OFF. The burner should
go off and the pump continue to run for a few
seconds.
The display should read:
returning to
when the pump stops.
4. Check the correct operation of the programmer (if
fitted) and all other system controls. Operate each
control separately and check that the main burner
responds.
Water circulation system
5. With the system COLD, check that the initial
pressure is correct to the system design
requirements. For pre-pressurised systems, this
should be 1.0 bar.
6. With the system HOT, examine all water connections
for soundness. The system pressure will increase
with temperature rise but should not exceed 2.5 bar.
7. With the system still hot, turn off the gas, water and
electricity supplies to the boiler and drain down to
complete the flushing process.
36
INSTALLATION
For additional gas supply information refer to "Gas Supply" on
page 9.
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.
16. Set the boiler on/off switch (A) to OFF.
17. Swing the control box into the servicing position. Refer to
Frame 49.
18. Remove the pressure gauge and tube. Tighten the sealing
screw in the pressure test point. Ensure a gas tight seal is
made.
19. Swing the control box back into its working position and
secure.
20. Refit the user control.
21. Refit the boiler front and bottom panels.
22. THE FASCIA
a. To remove the plastic fascia, prise off the retaining star
washers using a pair of pliers and place to one side.
b. Fill the remaining fixing holes with the white push in
caps provided.
23. Switch the boiler on again.
Note. A flushing solution should be used during the
flushing procedure: Flushing solutions Fernox
Superfloc, Sentinel X300 (new systems) or X400
(existing systems). Refer to Frame 6.
8. Refill and vent the system, add inhibitor (see Frame 6),
clear all air locks and again check for water
soundness.
Affix the water treatment warning label, supplied in the
hardware pack, in a prominent position on the system,
to prevent the use of incorrect water treatment
additives.
9. Reset the system initial pressure to the design
requirement.
10. Balance the system. Refer to Frame 5.
11. Check the condensate drain for leaks and check that it
is discharging correctly.
12. Finally, set the controls to the User's requirements.
Note.
The pump will operate briefly as a self-check once
every 24 hours in the absence of any system
demand.
WATER TEMPERATURE
Water temperature can be selected via the
thermostat (B)
Knob Setting Flow
Temp
o
C (
Max 82 (180)
Min 30 (86)
icos system -
Installation and Servicing
o
F)