20
6.12 GAS VALVE (fig. 26)
Carry out component removal procedure as described in 6.4.
The gas valve must be changed as complete unit. Disconnect
the electrical plug and leads from the gas valve, slacken and
unscrew gas valve inlet
and outlet pipes connections.
Please
note,
the sealing washers (
Q
) must be discarded and replaced
with new sealing washers. Disconnect the compensation pipe
from the gas valve. The gas valve can now be removed. Replace
in the reverse order. Check and adjust burner pressure settings.
WARNING, A GAS TIGHTNESS CHECK MUST BE CARRIED
OUT.
Fig. 26
6.15 BURNER (fig. 27)
Carry out component removal procedure as described in 6.4.
Unscrew and remove the air box front cover (fig. 22).
Locate and remove the six screws around the inner combustion
cover and remove.
Disconnect the spark plug cable connection, slide off the lower
cable grommet from the seat of the air distribution box, remove
the burner fixing screws and remove with the spark plug
attached and corresponding cables.
Replace in the reverse order.
6.16 MAIN HEAT EXCHANGER (fig. 28)
Carry out component removal procedure as described in 6.4.
Unscrew and remove the air chamber front cover (fig. 22).
Locate and remove the six screws around the inner combustion
cover and remove. Remove locking pins and disconnect the
pipes, from the flow and return connections on the heat
exchanger. Disconnect the hot and cold connections on the
heat exchanger. Disconnect the electrical plugs from the primary
thermistor, the heat exchanger can now be withdrawn from the
appliance. Replace in the reverse order. Ensure all seals are
in good condition, taking care to ensure they are replaced
correctly.
Fig. 27
Fig. 28
Q