Commissioning; Pre-Commissioning Checks; Filling The Appliance And Adding Inhibitor - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

7

Commissioning

7.1

Pre-Commissioning checks

DANGER
Risk of electric shock!
▶ Before carrying out any work on electrical components, isolate them
from the power supply (230 V AC) (fuse, circuit breaker) and secure
against unintentional re-connection.
▶ Check for zero potential before proceeding with work.
NOTICE
If the appliance is not to be commissioned immediately then, after
successfully completing all of the checks and any rectification work:
▶ Isolate the electricity supply.
▶ Isolate the gas supply.
▶ Close the water shut-off valves to the appliance.
▶ Label appropriately.
7.2

Filling the appliance and adding Inhibitor

Before pressurising the system.
Additional expansion vessel fitted to the system.
The appliance integral expansion vessel is pre-charged to 0.75 bar. A
Schrader type valve is fitted to the expansion vessel to allow for pressure
adjustment if required.
▶ If an extra expansion vessel is fitted to the central heating system,
ensure that it is set to the same pressure as the appliance internal
expansion vessel, refer to separate instructions supplied with the
extra expansion vessel.
Filling the system - Sealed systems
NOTICE
▶ Salt based softened water must not be used to fill the central heating
system.
▶ Check drain cocks and manual air vents are closed and all radiator
valves are open. Add a suitable inhibitor or combined inhibitor/anti-
freeze, if the system is exposed to freezing conditions, to the heating
system water in accordance with the manufacturers instructions.
▶ Turn on the water main and open the system valves.
▶ Fill the system to between 0.8 and 1.7 bar via a WRAS approved
filling loop or one of the Integrated filling link accessories.
– Refer to Integrated filling link accessory instructions for
operation and use.
▶ The Automatic Air Vent will release any air trapped in the appliance.
▶ Manually vent all radiators, tighten when completed and check the
system for any leaks and correct if required.
▶ Top up the system pressure if the pressure drops below 0.8 bar.
▶ Isolate and remove filling loop connections to the system.
– Refer to Integrated filling link accessory instructions for any
further actions required after filling the system.
Filling the system - When initially filling the appliance, before power is
applied, use the pressure gauge to set the system pressure. Once the
appliance electrical pre commissioning is complete and the appliance is
switched on refer to the digital pressure display on the appliance.
Condens 8300i W – 6721841531 (2022/10)
The analogue pressure gauge within the appliance is for indication
purposes only, and is intended to assist when initially filling the system.
Pressure shown on this gauge should not be compared to readings
shown on the digital display as they will differ, especially when the
circulation pump is running. Final adjustments to system pressure must
be made whilst referring to the digital pressure display.
1.5 bar
1 bar
Min
Fig. 28
Commissioning
Max
0010036124-001
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