8
5.1 Installation regulations
5.2 Installation requirements
Water supply
In an unvented system the pressure and flowrate is directly
related to the incoming water supply. For this reason it
is recommended that the maximum water demand is
assessed and the water supply checked to ensure this
demand can be satisfactorily met.
`We suggest the minimum supply requirements
should be 0.15MPa (1.5 bar) pressure and 20 litres
per minute flow rate. However, at these values outlet
flow rates may be poor if several outlets are used
simultaneously.
`A 22mm cold water supply is recommended,
however, if a smaller supply exists, which provides
sufficient flow, this may be used (although more
flow noise may be experienced).
`The higher the available pressure and flow rate the
better the system performance.
`See table 1 on page 5 for appliance operating
pressures. This is controlled by the Pressure Reducing
Valve.
`The water supply must be of wholesome water
quality (Fluid Category 1 as defined by the Water
Supply Regulations 1999).
Outlet/terminal fittings (taps, etc.)
`The appliance can be used with most types of
terminal fittings.
`Outlets situated higher than the appliance will give
outlet pressures lower than that at the heater, a
10m height difference will result in a 1 bar pressure
reduction at the outlet.
`All fittings, pipe work and connections must have a
rated pressure of at least 8 bar at 80°C.
4. Description of the product
4.1 General description
This appliance is a purpose designed unvented water
heater. The unit has a stainless steel inner vessel, which
ensures an excellent standard of corrosion resistance. The
outer casing is a combination of resilient thermoplastic
mouldings and pre-coated steel. All products are
insulated with CFC free polyurethane foam to give good
heat loss protection.
The appliance is supplied complete with all the necessary
safety and control devices needed to allow connection to
the cold water mains. All these components are preset
and should not be tampered with.
4.2 Operation principle
The unvented cylinder is used to heat and store hot water
for use in domestic applications.
The water can be heated indirectly through a coil in the
unit using an indirect heat source, or directly via back up
immersion heater.
4.3 Main connections
See Figure 4: Main connections on page 10
4.4 Standard delivery
The delivery includes:
`Cylinder
`Factory fitted
`Immersion heater(s) and thermal controls
`Combination Temperature and Pressure Relief
Valve (set at 90ºC / 1 Mpa (10bar)) with Expansion
Relief valve (set at 0.8Mpa (8Bar))
`Indirect thermostat and thermal cut-out
`Tundish
`Drain valve
`Wiring centre
`2 x 2 Port motorised valve
`Lock shield flow balancing valve
`Filling Loop
`Automatic air vent
`3 bar Pressure Reducing Valve (incorporating strainer)
`Isolating valve
`Mixing valve
`Mixing valve connection pipe
`Literature pack
`Instructions (inc benchmark commissioning
checklist & service record)
`Warranty card
Check all components are supplied in the pack and advise
your supplier if any are missing
5. Before installation
WARNING
Installation of the appliance must be carried
out by a qualified engineer in accordance
with prevailing and national regulations as
listed below.
`Building Regulations G3
`The Building Standards (Scotland)
`The Building Regulations (Northern
Ireland)
`I.E.E Electrical Regs
`UK Water Regulations
