Connecting The Flue Accessories; Filling The System And Checking For Tightness - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

Installation
Filling the condensate trap
DANGER
Danger to life from poisoning!
If the condensate trap is not filled, poisonous flue gas can escape.
▶ Fill the condensate trap with approx. 250 ml water via the flue pipe.
Fig. 22 filling the condensate trap with water
6.5

Connecting the flue accessories

For more detailed information on the flue gas routing and connection of
the flue pipe  see chapter 4, page 9
▶ Observe the installation instructions of the flue accessory.
▶ Remove the protective strip from the adhesive ring of the seal.
O
2
CO
2
1.
Fig. 23
▶ Align the seal [1] with the holes and stick it onto the housing of the
appliance.
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4.
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3.
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2.
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▶ Put on the flue accessory [2].
▶ Secure the flue accessory with screws [3].
▶ Check the flue gas path for tightness ( Chapter 6.6, page 18).
6.6

Filling the system and checking for tightness

NOTICE
Commissioning without water damages the appliance!
▶ Operate this device only when filled with water.
1 2 3
Fig. 24 Connections on the gas and the water side
[1] Heating flow valve
[2] Cylinder flow
[3] Gas
[4] Cylinder return
[5] Heating return valve
Filling and venting the DHW circuit
▶ Open the cold water tap [4] and open a DHW draw-off point until
water flows out.
▶ Check the joints for tightness (test pressure: max. 10 bar).
Filling and venting the heating circuit
▶ Adjust the expansion vessel pre-charge pressure to the static head of
the heating system ( Chapter 6, page 15).
▶ Open the radiator valves.
▶ Open the heating flow [1] and return [5] valves.
▶ Fill the heating system to 1 to 2 bar.
▶ Vent the radiators.
▶ Open air vent ( Chapter 2.8, page 8) and close again after venting.
▶ Refill the heating system to 1–2 bar and then close the drain valve
again.
▶ Check the joints for tightness (test pressure: max. 2.5 bar at the
pressure gauge).
Checking tightness of the gas line
▶ Close the gas isolator to protect the air/gas ratio control valve against
damage from excess pressure.
▶ Check tightness of all joints (test pressure: max. 150 mbar).
▶ Depressurise the system.
Operation without DHW cylinder
▶ Connect the connections for the cylinder flow and cylinder return
with a short-circuit line (accessory).
Condens 8300i W – 6721841533 (2022/12)
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