Technical data

Thermo Top E and Z/C 9Repair

9.2.2 Combustion Air Fan, Replacement

CAUTION

In case of Thermo Top E and C the circulation pump must

be removed first (see 9.2.1.1).

9.2.2.1 Removal

1. Carefully lever off cover (6, Fig. 902).

2. Disconnect electrical connector of combustion air fan.

3. Remove screws (11).

4. Withdraw combustion air fan (1) from burner housing

(5) and fuel pipe (9).

5. Remove gasket (2) and discard.

6. Perform procedures on components after

disassembly (refer to 9.1.1).

9.2.2.2 Installation

CAUTION

For the sealing between combustion air fain and burner

housing two gaskets (2, Fig. 902) are available or

contained in the spares kit. One paper gasket and one

rubber gasket with beads on one side to be used as

follows:

NOTE

A new combustion air fan has a groove for the gasket in

the mounting flange fan to burner housing.

Combustion air fan new –

Control unit / heat exchanger with burner housing

new = rubber gasket

Combustion air fan old –

Control unit / heat exchanger with burner housing

old = paper gasket

Combustion air fan old –

Control unit / heat exchanger with burner housing

new = paper gasket

Combustion air fan new –

Control unit / heat exchanger with burner housing

old = rubber gasket

1. Position new gasket (2) on burner housing (3).

2. Slide combustion air fan (1) onto fuel pipe (9) to bring

fan into installation position.

3. Secure combustion air fan (1) with screws (11).

Torque tighten screws to 4 ± 0.4 Nm.

4. Plug on electrical connections of combustion air fan.

5. Install circulation pump as required (see 9.2.1.2).

6. Plug on cover (6) and engage.

7. Perform CO

setting (see 6.2.6).