Hydraulic And Gas Connections (Without Pump Group); Gas Connection; Mounting The Pump - Bosch Worcester GB162-50 V2 Installation, Commissioning And Servicing Instructions

▶ Connect the flow and return line to the pump group, making sure they
are free of stress. The minimum diameter of the supply and return
line must be 1½ " (Ø 35 mm).
1
Fig. 38 Mounting the pump group
5.7

Hydraulic and gas connections (without pump group)

NOTICE: Damage to appliance due to excessive
operating pressure.
▶ Mount a pressure relief valve between the boiler and
isolation valve.
To make maintenance easier:
▶ Mount a hydraulic isolation valve in the supply and
return line.
▶ Connect the flow and return pipes to the boiler, making sure they are
free of stress. The minimum diameter of the flow and return pipes
must be 1½ " (Ø 35 mm).
5.7.1

Gas connection

▶ Seal the gas connection on the boiler using an approved sealant [1].
▶ Use a gas isolation valve [2] with a diameter of at least 1".
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▶ Connect the gas pipe without stress to the gas isolation valve.
1
Fig. 39 Installing the gas isolation valve
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[1]
[2]
5.7.2
▶ Select a pump based on the technical data ( tab. 4, page 9).
▶ Take the required flow rate into account ( tab. 8, page 10).
If a low loss header is not used:
▶ Select a pump that has a residual head of at least 200 mbar at the
required flow rate.
▶ Install the pump [6] in the return pipe [5].
1
2
Fig. 40 Connection of the heating water pipework
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10] Expansion vessel
[11] Dirt trap
1
2
Sealing agents
Gas isolation valve

Mounting the pump

6
4
7
3 5 3
8
Flow pipe
Pressure Relief Valve
Hydraulic isolation valve
Pressure gauge
Gas isolation valve
Return pipe
Pump
Non-return valve (only mandatory in cascades)
Drain & fill valve (DFV)
Fitting
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9
10
11
3 3
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