Alpha Pro Tec Plus 115 Installation And Servicing Instructions Download Page 30

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Alpha Pro Tec Plus 50, 70, 90, 115 - Routine Servicing

Fig. 6.2 - Pro Tec Plus 50

6.3 PREPARE FOR SERVICING - Fig. 6.4 or 6.5

1. Ensure the electrical supply is isolated and the gas supply is off.
2. Remove the front panel and lower the control panel as described in Section 4.7, paragraphs 1 and 2.

Pro Tec Plus 50 model

1.  Disconnect the electrode lead from the ignition generator and the in-line connector to the flame sensing electrode.
2.  Remove the two M4 screws securing the fan to the combustion chamber front.
3.  Remove the four screws located on the end tabs securing the combustion chamber front to the boiler chassis.
4.  Using a 10 mm ring spanner remove the four nuts securing the combustion chamber front to the heat exchanger. Slide

the complete assembly from the heat exchanger.

Pro Tec Plus 70, 90, 115 models

1.  Disconnect the gas supply pipe union from the burner manifold.
2.  Remove the two screws securing the fan assembly to the combustion chamber front.
3.  Remove the pressure tube.
4.  Disconnect the electrode lead from the ignition generator and the in-line connector to the flame sensing electrode.
5.  Remove the six nuts and washers securing the combustion chamber front and remove the complete assembly.

6.4 CLEANING THE BOILER

1.  Remove any deposits from heat exchanger using a suitable soft brush. Do not use a brush with metallic bristles.
2.  Check the condition of the combustion chamber insulation panels.
3.  Check the condition of the burner on the combustion chamber front assembly, carefully clean with a soft brush if necessary.

Do not use a brush with metallic bristles as this might damage the burner.

4. Remove any deposits from the heat exchanger coils. This can be done by suction or water sprayed onto the coils.

Ensure all electrical components are protected from water. Any water used to clean the heat exchanger will drain

through the condensate trap.

5.  Check the condition of the electrodes.
6.  Check the spark gap, positioning and height of the electrodes. Refer to Fig. 6.2 or 6.3.
7.  Unscrew the condensate trap drain to remove any deposits and flush with clean water.

6.5 RE-ASSEMBLE THE BOILER

Important:

Before replacing the combustion chamber front assembly, pour at least 200 cc of water into the coils of the heat

exchanger. This is to ensure the condensate trap is full of water before operating the boiler.
1.  Replace the combustion chamber front assembly, ensuring it is correctly located.
2.  Ensure the electrode lead is connected.
3.  Re-connect the gas pipe to the manifold, test the connections for gas tightness and re-commission, see Section 5.
4.  Re-connect the fan assembly to the combustion chamber assembly.
5.  Place the case or front case panel in position and secure in position with the screws previously removed, see Section 6.2.
6.  Check the operation of the boiler.
7.  Return all controls to their original settings.

Fig. 6.3 - Pro Tec Plus 70, 90, 115

Electrode gap

3 - 4 mm

Burner

Burner to electrode

gap 7 - 9 mm

Flame sensing

electrode

Front panel insulation

Ignition electrodes

Combustion chamber

front assembly