Water Supply; Appliance Location And Clearances; Appliance Location - Worcester Greenstar 8000 Life Installation And Maintenance Instructions Manual

4.2.3

Water supply

Water supply:
All seals joints and compounds (including flux and solder) and
components used as part of the secondary domestic water system must
meet the requirements of the WRC and hold approval by a notified body,
e.g. WRAS. The installation must also comply with the requirements of
Part G of the Building Regulations.
Use in hard water areas:
Normally there is no need for water treatment to prevent scale formation
as the maximum temperature of the DHW heat exchanger is limited by
the electronic control.
In areas where temporary water hardness exceeds 200ppm,
consideration may need to be given to the fitting of a scale prevention
device. In such circumstances, the advice of the local water authority
should be sought.
Water mains pressure:
• Minimum mains water pressure, for maximum performance refer to
section 12 "Technical Specifications/Logs".
• Maximum mains fed water static pressure is 10 bar.
If necessary fit a pressure reducing valve.
NOTICE
Non-return, back flow prevention devices (including those
associated with water meters) fitted to the mains water supply can
cause a pressure build up which could damage the boiler and other
household appliances.
NOTICE
Non-return valves in the cold water feed system.
If a non-return valve is fitted on the mains inlet, then pressure can
increase significantly over normal standing pressure when the appliance
carries out a DHW preheat or due to fast acting valves closing on other
appliances/outlets.
▶ To ensure water pressure stays at a level that will not damage the
boiler or other household appliances, we would recommend on
installations where standing pressure exceeds 3bar, that a 3 bar
pressure reducing valve and mini expansion vessel are fitted.
• Where the mains water supply has a non-return, back flow prevention
valve fitted, a mini expansion vessel [3] should be connected to the
mains water inlet pipe [1] between the non-return valve [2] and the
appliance[4] as shown below.
3
2
1
Fig. 9 Mini expansion vessel location
[1] Mains water inlet pipe
[2] Non-return valve
[3] Mini expansion vessel - part no. 7 716 192 105
[4] Appliance
Greenstar 8000 Life – 6720883865 (2021/11)
4
0010015563-001
4.3

Appliance location and clearances

4.3.1

Appliance location

• Follow local regulations for the location within the property that the
appliance is to be installed.
• This appliance is only suitable for installing internally within a
property at a suitable location onto a flat, fixed rigid surface capable
of supporting the appliance weight.
• The appliance is not suitable for external installation.
• Protect installation area against dust and moisture.
No surface protection is required against heat transfer from the
appliance.
DANGER
Danger to life from explosion!
An increased and permanent ammonia concentration may lead to stress
corrosion cracking on brass (e.g.gas valves, union nuts). As a result,
there is a risk of explosion from gas escaping.
▶ Do not use wall mounted gas boilers in rooms where there is an
increased or permanent ammoniac concentration (e.g. livestock
stables or storage room for fertilisers).
▶ If contact with ammonia is unavoidable, make sure that there are no
brass parts installed in the system.
DANGER
Danger from explosive and flammable materials:
Storage of explosive and flammable materials.
▶ Do not store flammable materials (paper, curtains, clothing, primer,
paint, ...) in proximity to the appliance.
NOTICE
Damage to appliance:
Contaminated combustion air.
▶ Do not use any cleaners containing chlorine or hydrogen halide (i.e.
spray cans, primers, cleaners, paint and glue).
▶ Do not store or use these substances in the appliance or room.
▶ Avoid the build-up of dust.
NOTICE
Damage to appliance:
Extreme temperatures may cause damage to the heating system.
▶ Ensure the ambient temperature is above 0 °C and below 35 °C.
NOTICE
Damage to system:
The heating system pipework can be damaged by frost if installed in an
internal unheated area, such as a loft, basement or garage.
The appliance internal frost protection only monitors the system water
temperature within the appliance to provide protection for the
appliance.
▶ Install a frost thermostat and pipe thermostat connected in series, to
protect the system pipework.
We recommend that the frost thermostat is sited in the coldest
unheated area in which pipework is located and that it is set to call for
heat at 5 °C. The Pipe stat should be located on whichever pipe is
Pre-Installation
15