24
intelligently applied technology
© Baxi Heating UK Limited 2005
6.1 Commission the Water, Electrical and Gas
Systems
Water
The system should be cold flushed. After re-filling,
all air must be vented from the system before the
boiler is commissioned.
On Sealed Systems, manually test the safety valve
and fill until the pressure gauge registers 1.5 bar.
Electrical
Ensure that the preliminary electrical safety checks
detailed on Page 20 have been carried out.
Gas
The whole of the gas installation including the
meter must be checked for soundness and purged
according to in GB BS 6891 and in IE I.S. 813
“Domestic Gas Installations”.
6.2 Commission the Boiler
Ensure the top cover and door are correctly
fitted.
1. Ensure that the main electricity supply is ‘On’, the
‘Mains On’ (Green) light will flash.
2. Ensure that the main gas supply is turned ‘On’ and
that the boiler gas service cock is in the ‘On’
position.
3. Check that the programmer and any other external
controls, if fitted, are in an ‘On’ position and calling
for heat.
4. Turn the temperature control knob to its maximum
setting, the ‘Burner On’ (Green) light will flash and
after several seconds, the burner will light
automatically.
5. When the burner flame has established, the ‘Burner
On’ (Green) light will be on and flames will be visible
through the sight glass.
6. With the burner running, check the boiler for gas
soundness using leak detection fluid.
7. Check that the gas supply pressure, burner
pressure and gas rate are correct. See data label
or refer to Page 6.
If adjustment of the burner pressure is required
follow Section 9.4.
8. Check that the burner flames are blue and stable.
9. Turn the temperature control knob to ( ) position
and check that the burner shuts down.
10. Remove the pressure gauge, re-fit the screws and
check for gas soundness.
11. Re-fit the controls cover assembly and secure with
the screws previously removed.
6.3 Flush the system
1. Drain the system whilst still hot.
2. Re-fill, vent the system, make a final check for
water soundness and add a suitable inhibitor.
3. Complete any labels supplied with the inhibitor and
attach to the boiler for future reference.
4. Set the system flow rate to give the required
temperature rise. Set the bypass flow rate.
5. On sealed systems fill until the pressure gauge
registers 1.5 bar. Set the pressure gauge pointer to
the system design pressure.
If the boiler fails to light
After five attempts (possibly due to air in the gas
supply) it will lockout and the ‘Lockout’ (Red) light will
be on.
To reset - Turn the temperature control knob to ( )
position. Wait until the ‘Lockout’ (Red) light switches
off. Turn the temperature control knob back to the
required setting. The boiler should reset and return to
normal operation.
If the boiler fails to operate
Check for fault or lockout codes on the control display
and refer to one or a combination of the following:-
User Operating label on the boiler. Wiring Diagram,
Control Sequence and Fault Finding sections in these
instructions.
6. Commissioning
Mains On
(Green)
Temperature
Control Knob
Burner On
(Green)
Lockout
(Red)
Fig. 21
