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3
Pre-Installation
3.1
Cleaning primary systems
CAUTION:
▶ Isolate the mains supplies before starting any work and observe all
relevant safety precautions. Guard against unintentional re-
connection.
NOTICE:
▶ All the following pre-installation sections must be read and
requirements met before starting the boiler or flue installations.
NOTICE:
▶ Debris from the system can damage the boiler and reduce efficiency.
Failure to comply with water treatment guidelines will invalidate the
appliance guarantee and contravene the Building Regulations.
▶ It is recommended that you fit a primary water cleanser to the
system. Worcester recommends a filter that will help remove both
magnetite and non-magnetic debris.
Before cleaning the system:
▶ Ensure that the system and pipe work is in good working order.
▶ Where possible keep the existing boiler/circulating pump in place
when flushing the system.
3.2
Water quality
Unsuitable or contaminated heating water can lead to faults in the boiler
and can damage the heat exchanger, among other things, due to sludge
formation, corrosion or lime scale deposits. Please get in touch with the
manufacturer if you require additional information on the water quality.
You will find the relevant addresses on the back cover of these
instructions.
▶ Do not use any chemical additives (e.g. inhibitors or pH-increasing or
reducing agents) other than those approved by Bosch
Thermotechnology ( table 8). The pH of the heating system water
must be between 7 and 8.5. If this is not the case, please contact
Worcester Customer Service before proceeding.
Product
Concentration
Fernox F1
See Fernox product data sheet
Sentinel X100
See Sentinel product data sheet
Table 8 Approved inhibitors by Bosch Thermotechnology Ltd.
3.3
Mains supply
NOTICE:
This boiler must not be connected to a 3 phase supply.
3.3.1
Electrical supply
• Supply: 230V - 50 Hz, 130 Watts
• Cable: PVC insulated H05VVF 3G1 (3 x 1mm
90 °C.
• External 3A fuse to BS1362.
• The boiler must be earthed.
• IPX4D.
• Wiring must comply with the latest edition of BS 7671 (IEE wiring
regulations).
Worcester Commercial Boiler Series – 6720814332 (2019/04)
3.3.2
• Boilers using Natural Gas (NG) must be connected to a governed
• Liquid Petroleum Gas (LPG) must be connected to a regulator.
• Installation and connection of the gas supply to the appliance must
• Gas pipe sizing should be calculated to ensure no more than the
• The meter or regulator and pipe work to the meter must be checked,
• This is to ensure that the equipment is in good working order and can
3.4
If the boiler is used in heating systems with natural water circulation or
open systems (where heating water is in contact with outdoor air):
▶ Install a system separation solution (a plate heat exchanger for
If plastic pipes are used in the heating system, with an underfloor heating
system for example,
▶ use plastic pipes with sufficient oxygen diffusion resistance
-or-
▶ Install a system separation solution (a plate heat exchanger for
Plastic pipe work:
• Any plastic pipe work must have a polymeric barrier with 600mm
• Plastic pipe work used for underfloor heating must be correctly
Primary systems connections/valves:
• All system connections, taps and mixing valves must at least be
• Radiator valves should conform to BS2767:10.
• All other valves should conform to BS1010.
• Thermostatic radiator valves (TRV's) must be fitted to all rooms
• A drain cock is required at the lowest point(s) in the system.
• An air vent is required at the high point(s) in the system.
An external automatic bypass should be used if the system flow can be
significantly adjusted or stopped by zone valves and thermostatic
radiator valves (TRV).
Sealed primary system:
2
) temperature rated to
Artificially softened water must not be used to fill the central
heating system.
• The CH sealed system must be filled using a WRAS approved filling
• An expansion vessel must be fitted as close as possible to the
• Do not use galvanised pipes or radiators.
Gas supply
meter.
be in accordance with BS6891 or IGE/UP/2 as appropriate.
permitted pressure drop between the meter/governor to the
appliance inlet ( Commissioning section).
preferably by the gas supplier.
meet the gas flow and pressure requirements, in addition to the
demand from any other appliance being served.
Water systems and pipe work
example) between the boiler and the heating system
example) between the boiler and the heating system.
(minimum) length of copper pipe before being connected to the
boiler.
controlled with a thermostatic blending valve limiting the
temperature of the circuits to approximately 50 °C.
capable of sustaining a pressure equal to the opening pressure of the
PRV used.
except bathrooms and the room in which the room thermostat is
fitted.
NOTICE:
method or comply with figure 10 for system fill.
appliance in the central heating return. When a pump group is used,
see Chapter 5.11.
Pre-Installation
13
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