Changing Components - Baxi Barcelona Installation And Servicing Instructions

13.0 Changing Components – page 28
Fig. 45
Fig 46
13.1

Changing Components

IMPORTANT: When changing components ensure that
both the gas and electrical supplies to the boiler are
isolated before any work is started.
When the boiler control knob is switched off the control
PCB remains live. Therefore it is important to isolate the
electrical supply.
Hazardous materials are not used in the construction of
Baxi products, however reasonable care during service is
recommended.
When replacing the combustion box door after changing
components, it is essential that the retaining screws are
tightened fully.
1. Before changing any components please read Section
1.2 Important Information.
2. Remove the outer case and lower door panel (see
"Fitting the Outercase" Section 11.0).
3. Isolate the water circuit and drain the system as
necessary. A drain point is located on the heat
exchanger manifold at the right hand side of the boiler
(Fig. 45) to enable the heat exchanger to be drained.
4. Place a tube on the drain point to drain water away
from electrics. Turn anticlockwise to open (Fig. 45).
NOTE: When reassembling always fit new 'O' rings,
ensuring their correct location on the spigot. Green "O"
rings are used for gas joints and Black "O" rings for water
joints. Use Greasil 4000 (Approved Silicone Grease).
5. After changing a component re-commission the boiler
where appropriate and check the inhibitor concentration
(see Section 6.2 and 10.1).
The thermistor, safety thermostat, interface PCB and the
flow switch can be accessed after removal of the outer
case.
13.2 Flow Temperature Thermistor and Safety
Thermostat (Fig. 46).
1. The procedure is the same for both the thermistor and
the safety thermostat.
2. Remove the electrical connections from the sensor.
3. Unscrew the sensor from the pipe.
4. Fit the new thermistor or safety thermostat and
reassemble in reverse order.