Gas Valve Adjustment - IDEAL IMAX XTRA E320 Installation And Servicing

51 GAS VALVE ADJUSTMENT

The boiler contains 2 Modules with individual gas valves. Both
must be adjusted.
Maximum rate adjustment
1. Switch the boiler on and operate for 10 minutes.
2. To ensure the boiler operates at maximum rate without
modulating set the fan speeds to maximum.
3. Remove the outer fascia panel on the Slave Module (see
Frame 52).
4. To set the fan speed to maximum. Press and hold in the
'mode' and '+' buttons simultaneously on the Master Module.
The display will show
indicating the boiler is operating at maximum rate.
Repeat on the Slave Module.
5. Connect a suitable flue analyser to the flue sampling point of
the Master Module (see Frame 12).
6. Using the maximum rate adjustment screw, adjust the
master module gas valve until the CO
(nb. clockwise reduces CO
7. Connect a suitable flue analyser to the flue sampling point of
the Slave Module (see Frame 12).
8. Using the maximum rate adjustment screw, adjust the Slave
Module gas valve until the CO
clockwise reduces CO
2
Note.
It is possible to switch off the CH/DHW systems if the mode and +/- buttons are not held simultaneously. Refer to Frame 30
under the heading CH/DHW Systems for guidance.
40
H as the first digit
measures 9.7% ± 0.2
2
).
2
measures 9.7% ± 0.2 (nb.
2
).
SERVICING
Minimum rate adjustment
9. To ensure the boiler operates at minimum rate without
modulating, set the fan speeds to minimum.
10. To set the fan speed to minimum. Press and hold in the
'mode' and '-' buttons simultaneously on the Master Module.
The display will show
indicating the boiler is operating at minimum rate.
Repeat on the Slave Module.
11. Connect a suitable flue analyser to the flue sampling point of
the Master Module - see Frame 12.
12. Remove the protective cap and then using the offset
adjustment screw, adjust the valve on the master module
until the CO
2
reduces CO
2
sensitive than the throttle adjustment.
13. Connect a suitable flue analyser to the flue sampling point
on the Slave Module (see Frame 12).
14. Remove the protective cap and then using the offset
adjustment screw, adjust the valve on the Slave Module
until the CO
2
reduces CO
2
15. Re-check the CO
to 15 if necessary.
16. Press the '+' and '-' buttons simultaneously to return to
normal operating mode.
17. Seal adjustment screw with tamper proof paint.
Maximum Rate Adjustment Screw
(Firstly remove plastic cap for access)
Offset Adjustment Screw
(Firstly remove plastic cap for access)
L as the first digit
value measures 9.5% ± 0.2 (nb. anti-clockwise
level). The offset adjustment is a lot more
value measures 9.5% ± 0.2 (nb. anti-clockwise
level).
level at maximum rate and repeat steps 3
2
IMAX XTRA -
Installation & Servicing