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COMMISSIONING
NOTICE: Do not use solvents, adhesive or lubricant
when pushing the pipe onto the rubber connector.
▶ Check that the condensate pipe has been connected to the syphon.
▶ Ensure that the condensate pipe has been inserted at least 25mm into
the elbow
25mm
Fig. 39 Condensate connection
If the appliance is not to be commissioned immediately
then, after successfully completing all of the checks and
any rectification work, shut off the gas and water supply
and electrically isolate the appliance.
6.2
FILLING THE SYSTEM
Open vented systems:
▶ Ensure all system and appliance drain points are closed.
▶ Open all radiator valves.
▶ Turn on the water supply to the system header tank and allow the
system to fill.
Sealed systems:
▶ Fill the system via a WRAS approved filling loop to 1 bar then turn the
valve anti-clockwise to close.
Opened vented and sealed systems:
▶ Vent (1) any air from the appliance heat exchanger using a suitable
container to collect any water. Ensure tube outlet (2) is directed away
from the fan or any other electrical component to prevent any water
damage. Also place a suitable cover over the fan to prevent any
spillage of water on to electrical connections. Ensure the cover is
removed after venting.
Fig. 40 Venting
38
▶ Vent all radiators and the primary side of the hot water cylinder,
Sealed systems only:
▶ If required increase system pressure back to 1 bar.
▶ Isolate and remove filling loop connection to system.
6.3
It is possible to have an ion exchange water softener fitted to the cold
water system of the property. However, the appliance requires an
untreated cold water connection taken from the mains supply, before
the water softener, to the primary water filling point of the heating
system.
Alternatively there are water softening/treatment devices that do not
adjust or alter the pH levels of the water. With these devices it may not
be necessary to provide an untreated water by-pass to the primary water
filling point of the heat system.
ENSURE THAT THE SYSTEM HAS BEEN CLEANED AS ON PAGE 30 OF
THESE INSTRUCTIONS.
6720644744-29.1Wo
FLUSHING (Central Heating):
▶ Switch off the appliance.
▶ Open all drain cocks and drain the system while the appliance is hot.
▶ Close drain cocks and add a suitable flushing agent at the correct
▶ Run the appliance/system at normal operating temperature for the
▶ Drain and thoroughly flush the system to remove the flushing agent
INHIBITOR (Central Heating):
▶ Check drain cocks are closed and all radiator valves are open before
▶ Fill system as described in section 6.2.
▶ Set all controls to maximum.
▶ Record the date when the inhibitor was added to the system on the
1
2
6720804530-12.1Wo
tighten when completed and check the system and correct any leaks.
WATER TREATMENT
NOTICE:
▶ ARTIFICIALLY SOFTENED WATER MUST NOT BE
USED TO FILL THE CENTRAL HEATING SYSTEM.
strength for the system condition in accordance with the
manufacturer's instructions.
time stated by the manufacturer of the flushing agent.
and debris.
adding a suitable inhibitor compatible with aluminium (or combined
inhibitor/anti-freeze if the system is exposed to freezing conditions)
to the heating system water in accordance with the manufacturers
instructions.
The pH value of the system water must be less than 8 or
the appliance guarantee will be invalidated.
guarantee card.
NOTICE:
▶ The concentration of inhibitor in the system should be
checked every 12 months or sooner if system content
is lost.
▶ Normally the addition of sealing agents to the system
water is not permitted as this can cause problems
with deposits left in the heat exchanger.
▶ In cases where all attempts to find a micro leak have
failed, Worcester, Bosch Group supports the use of
Fernox F4 leak sealer.
6 720 821 670 (2018/06)
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