IDEAL Concord CXi 110 Installation & Servicing Manual page 21

23 CHECKING THE MANIFOLD PRESSURES
Turn the boiler OFF by pressing the [0/1] button and allow the
flow temperature to cool to less than 50
Connect a pressure gauge to the burner manifold test point
(Frames 24 or 25).
Press the [0/1] button again to turn the boiler ON.
The boiler will operate at low rate for approximately 3 minutes
before proceeding to high rate (this will only happen if the flow
temperature is below 55 C otherwise the boiler will proceed
0
immediately to high rate).
24 ADJUSTING THE MANIFOLD PRESSURES
LEGEND
1. Fascia panel display.
2. Overheat thermostat
reset button.
3. Main gas inlet cock.
4. Union.
5. Gas control valve.
1. Press the [ENTER] button on the fascia panel, press either
the [UP] or [DOWN] arrow button until the display shows:
then press [ENTER]. The microprocessor is now in
commissioning mode. Failure to enter the commissioning
mode will result in a fault condition being detected when
the following actions are carried out.
Concord CXi -
Installation
INSTALLATION
0 C.
6. Screw - minimum adjuster.
7. Gas rate adjuster - maximum.
8. Burner setting pressure test
point.
9. Inlet pressure test point.
10. High/low solenoid connector.
Observe the burner pressures and compare them to the
values given in Table 1. If either pressure differs by more than
10% reset the pressures by following the procedure in Frames
24 & 25.
2. If desired, it is possible to use the onboard commissioning
instructions, using the [UP] / [DOWN] arrow buttons.
However the following paragraphs provide more detailed
instructions and are recommended until the installer is
familiar with the Concord CXi.
3. It is essential to adjust the maximum setting first.
4. Adjust the system controls to ensure that the boiler will
operate at high rate for a reasonable period.
5. Remove the dust cover from the adjustment screw in the
bottom valve and gently screw the adjustment in fully.
6. Remove the dust cover from the adjustment screw on the
top (high/low) valve and, using a hexagon key or equivalent,
screw the adjuster gently fully in. Then screw the adjuster
out until the burner pressure to approximately 11.5 mbar.
Finally, screw out the adjustment on the bottom valve until
the burner pressure is correctly set to the value given in
Table 1.
21