Bosch ZBR 70-3 - Mounting the Connection Set; Connection of Heating Pipes; Set); Gas-Side Connection

Assembly
13
Condens 5000W – 6720813952 (2019/02)
 Connect the gas pipe without stress to the gas isolator.
Fig. 13 Installing the gas isolator
[1] Sealing agents
[2] Gas isolator
5.8.2 Mounting the connection set
 Attach the screw fitting delivered with the wall mounted gas
condensing boiler ( figure 1, [8]) to the flow and return connection
of the wall mounted gas condensing boiler.
 Connect the connection set to the flow and return connection of the
wall mounted gas condensing boiler.
 Use the flat gaskets [1] (included in the scope of delivery) for this.
 Connect the flow and return line to the connection set, making sure
they are free of stress. The minimum diameter of the supply and
return line must be 1½" (Ø 35 mm).
Fig. 14 Mounting the connection set
5.9 Connection of heating pipes (without connection
set)
NOTICE:
Damage to appliance due to excessive operating pressure.
 Mount a pressure relief valve between the wall mounted gas
condensing boiler and shut-off valve.
To make maintenance easier:
 Mount a service valve in the supply and return line.
 Connect the flow and return line to the wall mounted gas condensing
boiler, making sure they are free of stress. The minimum diameter of
the flow and return line must be 1½" (Ø 35 mm).
5.9.1 Gas-side connection
 Seal the gas connection on the wall mounted gas condensing boiler
using an approved sealant [1].
 Use a gas isolator [2] with a diameter of at least 1".
 Connect the gas pipe without stress to the gas isolator.
Fig. 15 Installing the gas isolator
[1] Sealing agents
[2] Gas isolator
5.9.2 Mounting the pump
 Select a pump based on the technical data ( tab. 2, page 9).
 Take the required flow rate into account ( tab. 4, page 10).
If a low loss header is not used:
 Select a pump that has a residual head of at least 200 mbar with the
required flow rate.
 Install the pump [6] in the return line [5].
Fig. 16 Connection of the heating water pipework
[1] Flow pipe
[2] Pressure Relief Valve
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