WATER SUPPLY
Bear in mind that the mains water supply to the
property will be supplying both the hot and cold water
requirements simultaneously.
It is recommended that the maximum water
demand is assessed and the water supply checked
to ensure this demand can be satisfactorily met.
Note: A high mains water pressure will not always
guaranteehighowrates.
Wherever possible the mains supply pipe should be
22mm. We suggest the minimum supply requirements
should be 0.15MPa (1.5 bar) pressure and 20 litres
perminuteowrate.However,atthesevaluesoutlet
ow rates may be poor if several outlets are used
simultaneously. The higher the available pressure and
owratethebetterthesystemperformance.
HARD WATER AREAS
The building regulations L1A: New dwellings/L1B:
Existing dwellings and the requirements set out in
the Domestic Building Services Compliance Guide
specify that ‘Where the mains total water hardness
exceeds 200 parts per million, provision should be
made to treat the feed water to water heaters and the
hot water circuit of combination boilers to reduce the
accumulation of limescale.’
To maintain the performance of the Thermal Store
water heater and in order to comply with this regulation
the hardness of the mains water should be checked
bytheinstallerandifnecessarytaproprietaryscale
reducer or water softener to the cold water supply,
refer to the manufacturers instructions for installation
for guidance.
Please consult the local water authority for additional
advice on water quality if required.
INHIBITOR
The use of a corrosion inhibitor is recommended
to prolong the performance and efciency of the
Thermal Store. Checking the concentration of
corrosion inhibitor in the Thermal Store is essential,
dose appropriately according to the size of the
Thermal Store volume in accordance with the inhibitor
manufacturer’s guidelines.
Please refer to BS 7593:2006 Code of practice for
treatment of water in domestic hot water central
heating systems.
PIPE FITTINGS
The cold feed is made via 22mm copper pipe spigot.
Primary coil pipe fittings are made via 22mm
compression ttings directly to the unit.The ttings
are threaded 3/4”BSP male parallel, should threaded
pipe connections be required.
INSTALLATION GENERAL COLD FEED
A 22mm cold water supply is recommended, however,
ifa15mm(1/2”)supplyexists,whichprovidessufcient
ow,thismaybeused(althoughmoreownoisemay
be experienced).
A stopcock or servicing valve should be incorporated
into the cold water supply to enable the Thermal
Store and its associated controls to be isolated and
serviced.
OUTLET
The hot water outlet is a 22mm compression tting
located at the thermostatic mixer valve (TMV2). Hot
water distribution pipework should be 22mm pipe with
shortrunsof15mmpipetoterminalttingssuchas
sinks and basins. Pipe sizes may vary due to system
design.
The Thermal Store can be used with most types of
terminal ttings. It is advantageous in many mixer
showers to have balanced hot and cold water supplies.
In these instances a balanced pressure cold water
connection should be placed between the cold water
supply inlet and Thermal Store cold feed connection.
Aminimumdistanceof2mtrstotherstcoldwater
draw off-take must be observed (see Fig. 4, page 8).
Outlets situated higher than the thermal Store will
give outlet pressures lower than that at the heater, a
10m height difference will result in a 0.1MPa (1 bar)
pressurereductionattheoutlet.Allttings,pipework
and connections must have a rated pressure of at least
0.5MPa (5 bar) at 80°C.
DOMESTIC HOT WATER BACK EXPANSION
During a heating cycle the expansion of water in
the DHW heat exchanger must be accommodated.
Expansion back into the mains may not always be
possible. (For example, a double check valve may be
tted in the mains supply). If required the minimum
expansion vessel size recommended is 1ltr. This must
bettedupstreamoftheDHWexchangerasshownin
the schematic. (Figure 4, Page 8)
Any method or product used for accommodating the
expansion must comply with the Water Regulations
and relevant standards.
MANUAL HANDLING GUIDANCE
The appliance exceeds the recommended weight for
a one man lift. Upon installation it will be necessary
to get assistance when lifting or manoeuvring the
product into place. Use of mechanical lifting aids may
be necessary.
DO NOT LIFT THE APPLIANCE BY THE ATTACHED
PIPEWORK OR ANCILLARY COMPONENTS.
