Maintaining Your Appliance; Benchmark Standard; Prepare For Operation; Sealed Heating System - Bosch Condens 4700iW User Instructions

2.3

Maintaining your appliance

Your new appliance represents a long term investment in a reliable, high
quality product.
Wipe the appliance casing with a soft clean cloth. Please do not use
chemical cleaning products which may damage the paint finish.
In order to realise the appliance's maximum working life, and to ensure
the appliance continues to operate at peak efficiency and performance,
it is essential that servicing and maintenance checks are performed at
least once a year by a competent engineer in accordance with the current
Gas Safe Regulations.
If you would like to know more about servicing options from Bosch,
please visit www.worcester-bosch.ie
Please tick the appropriate box on your warranty registration card for
further details of the Bosch Service Contract.
When your appliance requires servicing please contact a Bosch contact
centre (see rear cover, appointments).
In addition to the service contract we are pleased to offer a one-off
annual service or breakdown call out for your appliance.
Maintenance tips
• Appliances on a sealed heating system:
– Regularly check the system pressure.
• Do not obstruct the flue outlet or the air inlet.
• Use in hard water areas:
– In exceptionally hard water areas a device to prevent scale
formation should be fitted. Installation of a salt based water
softener should be in accordance with the requirements of the
local water company. A bypass valve must be fitted and used to
fill/top up the heating system with untreated water.
Important note:
▶ If you have to add water regularly in your heating system, call a
competent, qualified person.
2.4

Benchmark standard

The Benchmark initiative is a code of practice
to encourage the correct installation,
commissioning and servicing of domestic
central heating appliances and system
equipment.
A "checklist" is dispatched with every appliance and can be found
towards the back of the Installation, Commissioning and Servicing
Instructions. This is a vital document that needs to be completed by the
installer at the time of installation. It confirms that the appliance has
been installed and commissioned according to the manufacturer's
instructions.
The service record provides space for the recording of regular servicing
of the appliance/heating system and this can become a valuable
document when, for example, you wish to sell the property. The service
record will show a potential purchaser that the heating system has
received regular professional maintenance and servicing during its
lifetime.
The Benchmark initiative aims to:
• Raise standards among professional installers.
• Build and maintain high safety standards in the industry.
• Improve customer satisfaction levels.
• Make a contribution to the nation's commitment to climate change.
Condens 4700iW – 6721864484 (2023/04)
3

Prepare for operation

Heating system configuration overview
The appliance can be connected to a sealed or semi-sealed heating
system depending on the installation conditions.
• The appliance is factory supplied for a sealed heating system with
water pressure of 0.6 bar or greater.
• The appliance can be connected to a semi-sealed system with low
water pressure.
– If the system pressure is gravity fed and cannot be increased via a
filling link, then the appliance can be converted to allow
connection to a semi-sealed heating system
Your installer will advise you on the type of heating system you have,
please also ensure that the Heating system configuration table, page 4,
has been filled in by your installer as it informs you for which operation
section you need to read and for future reference.
3.1

Sealed heating system

Appliances that can be connected to sealed heating systems are pre-
pressurised before operation, this pressure must be maintained for safe
use of the appliance.
▶ Check regularly that the pressure is maintained.
▶ Re-charge the system if the pressure indicator reads less than 0.8
bar.
▶ If a permanent significant decrease or increase in pressure is shown
on the pressure indicator, contact your installer or maintenance
engineer.
Pressure indicator
▶ Type of pressure indicator for the system pressure.
– Pressure gauge (an analogue dial showing the pressure)
– Pressure menu (a digital readout of the pressure)
▶ Your appliance may have one or both types of methods to indicate the
system pressure. The type of method used on this appliance will be
detailed in the following section.
3.1.1

Checking the system pressure

The appliance pressure menu indicates the pressure within the heating
system during standby and operating periods.
Your installer will advise you of the optimum operating pressure.
▶ Check the system pressure on the pressure menu.
– Static pressure is when appliance is cold and has not fired for
heating or hot water. This will generally be 0.8 - 1.7 bar.
– Operating pressure is when the appliance is firing for a heating
or hot water demand. This will generally be 1 - 2 bar.
Min
1
Fig. 2 Checking the operating pressure
[1] Static pressure range.
[2] Operating pressure range.
[3] Pressure menu indicator.
The pressure menu can be accessed via the Boiler status screen.
▶ Press the menu key ( ). Select and confirm Boiler status.
The screen Boiler status with a pressure menu indicator appears.
Prepare for operation
3
Max
2
5