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4
PRE-INSTALLATION
4.1
CLEANING PRIMARY SYSTEMS
NOTICE: All the following Pre-Installation sections must
be read and requirements met before starting boiler or
flue installations.
CAUTION: Isolate the mains supplies before starting any
work and observe all relevant safety precautions.
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 warranty.
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 started.
▶ 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.
WATER TREATMENT PRODUCTS
Suitable water treatment products can be obtain from the following
manufacturers:
Greenstar Ri
ErP
- 6 720 813 283 (2016/07)
ADEY
01242 546717 or www.adey.com
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.
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.
4.2
MAINS SUPPLY
4.2.1 ELECTRICAL SUPPLY
• Supply: 230V - 50 Hz, 140 Watts
• Cable: PVC insulated 0.75mm
• External 3A fuse to BS1362.
• The appliance must be earthed.
• Do not connected the appliance to a 3 phase supply.
• IP20.
• 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.
4.3
WATER SYSTEMS AND PIPE WORK
PLASTIC PIPE WORK:
• Any plastic pipe work must have a polymeric barrier with 600mm
(minimum) length of copper pipe connected to the boiler.
• Plastic pipe work used for underfloor heating must be correctly
controlled with a thermostatic blending valve limiting the temperature
of the circuits to approximately 50 °C.
PRIMARY SYSTEMS CONNECTIONS/VALVES:
• All system connections, taps and mixing valves must be capable of
sustaining a pressure up to 3 bar.
• Radiator valves should conform to BS2767:10.
• All other valves should conform to BS1010.
• Thermostatic radiator valves (TRV) must be used on all radiators
within the sleeping accommodation.
The radiator where the room thermostat is sited must be fitted with
lock-shield valves and left open.
• A drain cock is required at the lowest point in the system.
• An air vent is required at all high points in the system.
NOTICE: To prevent reverse circulation
▶ The cylinder return must be the last connection on the
common return pipe.
PRE-INSTALLATION
2
(24 x 0.2mm) temp. rated to 90 °C.
11
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