Baxi Main Combi Eco Installation & Service Instructions Manual page 46

Venturi Inlet
Pipe
Gas Valve
Sensing Pipe
Power Lead
Earth Lead
Gas Feed
Elbow
Fig. 99
Retaining Bracket
Boiler Chassis
Fig. 100
46
© Baxi Heating UK Ltd 2011
Fig. 99a
Expansion Vessel
Spring
Washer
Lock Nut
14.0 Changing Components
14.22
IMPORTANT: After replacing the valve the CO
checked and adjusted as detailed in Section 15.0 Setting
the Gas Valve. Only change the valve if a suitable
calibrated combustion analyser is available, operated by a
competent - see section 13.1.
1. Turn the gas cock off and undo the nut on the gas feed
elbow under the boiler.
2. Remove the screws securing the gas valve to the boiler
bottom panel.
3. Pull off the power lead, earth lead and sensing pipe.
4. Undo the nut on the gas pipe at the gas/air inlet and the gas
valve. Remove the pipe, taking care not to lose the sealing
washers. Remove the valve.
5. Reassemble in reverse order., ensuring that all seals are in
place and the injector is fitted.
NOTE: To assist the boiler to light prior to final setting,
Throttle
use a suitable hexagon key to wind out the Throttle
Adjustment Screw
Adjustment Screw until it is flush with the valve body, then
turn the screw 4 full turns clockwise (Fig. 99a). If the boiler
will not light, or the correct CO
contact the 'heateam' technical helpline.
14.23
1. Drain the boiler primary circuit and undo the nut on the
vessel connection pipe.
2. Remove the screw retaining the air inlet pipe, and swing the
pipe to one side.
3. Undo and remove the locknut and spring washer securing
the vessel spigot to the boiler lower panel.
4. Remove the bracket and vessel from the boiler.
5. Locate the retaining bracket on the upper flange of the new
vessel and fit to the boiler.
6. Examine the sealing washer, replacing if necessary, and
reassemble in reverse order.
Gas Valve (Fig. 99)
cannot be achieved
2
Expansion Vessel (Fig. 100)
must be
2