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PRE-INSTALLATION
4
PRE-INSTALLATION
4.1
Cleaning primary systems
CAUTION:
▶ ISOLATE THE MAINS SUPPLIES BEFORE STARTING
ANY WORK AND OBSERVE ALL RELEVANT SAFETY
PRECAUTIONS.
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 the
guidelines for the use of water treatment with the
appliance 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
fitting 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.
FOLLOW THE GUIDANCE OF BS7593:
Treatment of water in domestic hot water central heating and also the
flushing guidelines below.
NOTICE: Artificially softened water must not be used to
fill the central heating system.
FLUSHING THE SYSTEM
▶ Fill the system with cold water and check for leaks.
▶ Open all drain cocks and drain the system.
▶ Close drain cocks and add a suitable flushing agent compatible with
aluminium at the correct strength for the system conditions in
accordance with the manufacturer's instructions.
The pH value of the system water must be less than 8 or the
appliance guarantee will be invalidated.
▶ Circulate the flushing agent before the boiler is fired up.
▶ Run the boiler/system at normal operating temperature as directed by
the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris.
▶ It may be necessary to use a power flushing machine to aid the
cleansing procedure in some circumstances.
▶ Close the drain cocks and refill with fresh water and a suitable
inhibitor.
▶ Vent any air from the boiler and system.
Inhibitor
Add a suitable inhibitor or combined inhibitor/anti-freeze, if the system
is exposed to freezing conditions, to the heating system in accordance
with the DWTA code of practice and manufacturer's guidelines.
WARNING: Sealing agents
▶ 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.
12
Water treatment products
Suitable water treatment products can be obtain from the following
manufacturers:
FERNOX
0870 601 5000 or www.fernox.com
SENTINEL
0800 389 4670 or www.sentinel-solutions.net
Artificially softened water
It is possible to have an ion exchange water softener fitted to the cold
water system of the property. However, the boiler 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.
4.2
MAINS SUPPLY
4.2.1
Electrical supply
• Supply: 230V - 50 Hz
• Cable: PVC insulated 0.75mm
90 °C.
• External 3A fuse to BS1362.
• The boiler must be earthed.
• This boiler must not be connected to a 3 phase supply.
• IPX4D.
NOTICE: IP rating change
IP rating IPX4D is reduced to IP20 if the following
controls are fitted;
MT10, 7 716 192 036 or MT10RF, 7 716 192 037
or FR100 7 716 192 067.
This is reduced to IPX2D when the Sense II
7 738 111 064 is fitted.
• Wiring must comply with the latest edition of BS 7671 (IET wiring
regulations).
4.2.2
Gas supply
To ensure that the equipment is in good working order and can meet the
gas flow and pressure requirements, in addition to the demand from any
other appliance being served, the following applies:
• Boilers using Natural Gas (NG) must be connected to a governed
meter.
• Liquid Petroleum Gas (LPG) must be connected to a regulator.
• Installation and connection of the gas supply to the boiler must be in
accordance with BS6891.
• Gas pipe sizing should be calculated to ensure no more than the
permitted mbar drop between the meter/governor to the appliance
inlet. ( Commissioning section).
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier.
CDi Compact
2
(24 x 0.2mm) temperature rated to
ErP
- 6 720 813 276 (2015/07)
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