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INSTALLATION
23
Concord CXSi/H - Installation & Servicing
SETTING THE HIGH BURNER PRESSURE
1. Turn the boiler thermostat knob to OFF.
2. Undo the screws holding the electrical plug on the bottom gas
valve and pull it off.
3. Turn the boiler on and remove the plastic dust cover from the
adjustment screw on the top gas valve and, using a suitable
spanner, screw the adjuster gently fully in. Then screw the
adjuster out until the burner pressure is approximately 9.0 mbar.
4. Turn the boiler off and refit the electrical plug on the bottom
valve.
5. Turn the boiler on and remove the dust cover from the adjustment
screw in the bottom valve. Set the burner pressure to the value in
Table 1.
6. After setting, allow the boiler to operate for 3 minutes to stabilise
then recheck the setting.
22
MANIFOLD GAS PRESSURE - CXSi 180/H ONLY
Inlet PTP
Dust cover
Con 6023
5
Remove plastic
dust cover
Con 6024
3
Low rate
adjustment
screw
Gas rate
adjuster
maximum
High solenoid plug
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
7. Turn the boiler thermostat knob to OFF.
8. Disconnect the 'high' solenoid plug from the top valve.
9. Disconnect the electrical plug from the bottom and middle
valves.
10.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.
11. Turn the appliance off and reconnect all the electrical
plugs.
12.Refit both dust covers over the adjustment screws and
refit the pressure test point screw.
13.Check for gas soundness
IMPORTANT. Do not adjust the middle valve, which is factory set.
INSTALLATION
157294-3.pmd 11/8/2005, 9:59 AM23