Changing Components - Baxi 100/2 HE Plus Installation & Servicing Instructions Manual

Heat Exchanger
Safety
Thermostat
Fig. 46
32
Fig. 45
Manifold
Drain Point
Electrical Connections
Flow Temperature Thermistor
13.0
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.
"The boiler cannot be switched off at the boiler,
therefore it is important to isolate the electrical supply
at the mains fuse."
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).
WARNING: The PCB Control and Fan
Assembly is 325 Vdc. Isolate at supply
before access.
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).
Tube
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
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.
Changing Components
(Fig. 46)