Adjusting The Operating Pressure Of The Heating System; Replacing The Gas Valve - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

▶ Replace the condensate trap and check for tightness.
0
1.
Fig. 63 Install the condensate trap
9.18 Adjusting the operating pressure of the heating
system
Display on the pressure gauge
1 bar Minimum filling pressure when system is cold
1 - 2 bar Optimal filling pressure
3 bar The maximum operating pressure for the maximum
heating water temperature must not be exceeded,
otherwise the pressure-relief valve will open.
Table 27
If the indicator is below 1 bar when the system is cold:
▶ Fill the hose with water to prevent air entering the heating system.
▶ Top up the water until the indicator is between 1 bar and 2 bar again.
If pressure is not being maintained:
▶ Check the expansion vessel and heating system for leaks.
9.19

Replacing the gas valve

▶ Close the gas isolator.
1. Unscrew the bayonet connection.
2. Unscrew the union nut.
3. Remove the gas pipe.
1.
Fig. 64 Removing the gas pipe
Condens 8300i W – 6721841531 (2022/10)
3.
2.
0010020541-002
3.
2.
0010017782-001
1. Unplug the plug.
2. Unscrew the union nut.
Fig. 65 Unplugging the plug and unscrewing the union nut
1. Remove the 2 screws.
2. Remove the air/gas ratio control valve.
Fig. 66 Removing the gas control valve
▶ Install the air/gas ratio control valve in reverse order, and check the
gas/air ratio.
Inspection and maintenance
1.
2.
0010017781-001
2.
1.
0010007251-001
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