Replacing Components; Removing The Air/Gas Ratio Control Valve; Removing The Fan - Bosch Condens 7000 F Installation And Maintenance Instructions For The Contractor

11.11 Replacing components

NOTICE:
Malfunctions due to incorrectly connected or unconnected hose
lines!
If the wrong hose lines are used or if they are incorrectly connected, this
leads to unhygienic combustion.
▶ Connect the hose lines as shown in the connection diagram
(Chapterl 17.4.3, page 61).
▶ Make sure the hose lines are not buckled or trapped.

11.11.1 Removing the air/gas ratio control valve

Observe replacement interval of the air/gas ratio control valve.
▶ Replace air/gas ratio control valve depending on the service life
according to tab. 14, page 42.
▶ Shut down the heating system ( Chapter 9.1, page 30).
▶ Close the main gas shut-off valve or gas isolator and secure against
unintentional re-opening.
▶ Remove the front panel ( Chapter 11.1, page 31).
▶ Undo the hose clip and pull off the compensation test cable [1]
at the valve.
▶ Remove the plugs of the solenoid valves at the air/gas ratio control
valve and valve testing system [4].
▶ Undo the union nut on the gas supply pipe [2].
▶ Undo the 4 screws [5] on the flanges [3] of the air/gas ratio control
valve at the top and bottom.
▶ Remove the air/gas ratio control valve.
4
3
2
1
Fig. 57 Undo the air/gas ratio control valve connections
(150 ... 300 kW)
[1] Compensation test cable
[2] Gas supply pipe union nut
[3] Flange
[4] Plug for solenoid valves
[5] Screws (4 x) top and bottom
[6] Test cable for gas outlet pressure
Condens 7000 F – 6720871560 (2019/11)
5
4
3
2
1
Fig. 58 Undo the air/gas ratio control valve connections
(75 ... 100 kW)
[1] Compensation test cable
[2] Gas supply pipe union nut
[3] Flange
[4] Plug for solenoid valve
[5] Screws (4 x) top and bottom
[6] Test cable for gas outlet pressure

11.11.2 Removing the fan

▶ Shut down the heating system (Chapter 9.1, page 30).
▶ Close the main gas shut-off valve or gas isolator and secure against
unintentional re-opening.
▶ Remove the front panel (Chapter 11.1, page 31).
▶ Detach the electrical connections at the fan (Fig. 59 or fig. 60).
5
▶ Disconnect the plug-in connector (Fig. 59)
With room sealed operation:
4
▶ Release the hinged pipe clip on the supply air hose
(Fig. 42, pipe 36).
▶ Pull off supply air hose together with the connector from the
ventilation air collector (Fig. 42, page 36).
5
6
0010012557-001
Fig. 59 Electrical connections, removing the fan
(boiler rating 75-100 kW)
[1] Hexagon nuts (4x) on the mixture manifold
[2] Electrical connections on the fan, boiler rating 75-100 kW
[3] Union nut on venturi, boiler rating 75-100 kW
[4] Plug-in connector, boiler rating 75-300 kW
Inspection and maintenance
0010013913-001
1
4 3
5
6
2
0010015320-001
41