Baxi Potterton Promax Combi HE Plus A Range Service Manual download pdf (Page 41)

15.0 Changing Components

15.1 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 these 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.

After Changing Components a combustion check

should be performed (see Section 15.8.11). This is

especially important on gas carrying parts, and those

that may affect combustion (e.g. fan).

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 13.0).

WARNING: The PCB Control and Fan

Assembly are 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).

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 12.1).

The thermistor, safety thermostat, interface PCB and

the flow switch can be accessed after removal of the

outer case.

15.2 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.

Drain Point

Heat Exchanger

Manifold

Tube

Electrical Connections

Flow Temperature Thermistor

Safety

Thermostat

Fig. 45

Fig. 46

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 59 60

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Baxi Potterton Promax Combi HE Plus A Range Service Manual Page 41

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