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INSTALLATION
22
Concord CXSi/H - Installation & Servicing
21
MANIFOLD GAS PRESSURE - CXSi 110/H-160/H ONLY
SETTING THE HIGH BURNER PRESSURE
1. Remove the dust cover from the adjustment screw in
the bottom valve and gently screw the adjustment in
fully.
2. Remove the plastic dust cover from the adjustment
screw on the top (high/low) valve and, using a spanner,
screw the adjuster gently fully in then screw the adjuster
out until the burner pressure is approximately 10.9 mbar.
3. Finally, screw out the adjustment on the bottom valve
until the burner pressure is correctly set to the value
given in Table 1.
4. After setting, allow the boiler to operate for 3 minutes to
stabilise then recheck the setting.
The manifold setting pressure must now be
checked and adjusted as necessary. It is
essential to set the High Pressure first
Start the adjustment procedure with the
system cold, on full load and with all
temperature controls set to maximum to
avoid thermostatic shutdown. Remove the
screw in the burner setting pressure test
point and connect a suitable gas pressure
gauge.
Turn on the electrical supply to light the
boiler and let it operate for about 10 minutes
to stabilise the burners. Check the pressure
and if it differs noticeably from that given in
Table 1 for the appropriate boiler size adjust
it as follows:
SETTING THE LOW BURNER PRESSURE
5. Turn the boiler thermostat knob to OFF.
6. Disconnect the 'high' solenoid plug from the top valve.
7. Disconnect the LH electrical plug from the bottom valve.
8. Turn the boiler on and set the low pressure to the value
given in Table 1, using the low rate adjustment screw inside
the spindle of the top valve.
9. Turn the appliance off and reconnect all the electrical plugs.
Do not overtighten the electrical plug fixing screws.
10.Refit both dust covers over the adjustment screws and refit
the pressure test point screw.
11. Check for gas soundness.
INSTALLATION
157294-3.pmd 11/8/2005, 9:59 AM22