Pre-Installation; Cleaning Primary Systems; Mains Supply; Electrical Supply - Worcester GREENSTAR 24 Installation, Commissioning And Servicing Instructions

Pre-Installation

3 PRE-INSTALLATION
3.1

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 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.
8
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:
FERNOX 0870 601 5000 or www.fernox.com
SENTINEL 0800 389 4670 or www.sentinel-solutions.net
Table 7
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.
3.2

MAINS SUPPLY

3.2.1

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.
• This boiler must not be connected to a 3 phase supply.
• IPX4D.
NOTICE: This is reduced to IP20 if the following
mechanical timers are fitted;
7 716 192 036 or 7 716 192 037
or FW100 7 716 192 067
• Wiring must comply with the latest edition of BS 7671 (IEE wiring
regulations).
3.2.2

GAS SUPPLY

• Boilers using Natural Gas (NG) must be connected to a governed
meter.
• Installation and connection of the gas supply to the boiler must be in
accordance with BS6891.
• Under no circumstance should the size of the gas supply pipe be less
than 22 mm.
• The meter or regulator and pipe work to the meter must be checked,
preferably by the gas supplier.
This is 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.
3.2.3

WATER SUPPLY

WATER MAINS PRESSURE:
• Minimum mains water pressure for maximum performance: 1.5 bar.
• Maximum mains fed water pressure 10 bar.
If necessary fit a pressure reducing valve.
2
) temperature rated to
6 720 811 922 (2014/07)