Specifications

6
3
3.1 PIPE FITTINGS
The connection points to the heating system are in 22mm o/dia copper pipe on 120 and 150 litre
units. On units 170 litres and above the primary ow connection is 28mm, the ow connections
to central heating (CH) zones 28mm and the domestic hot water (DHW) return connection 22mm
o/dia copper pipe. The use of appropriately sized COMPRESSION FITTINGS is recommended
when connecting to the Premier Plus SystemFit pipes. Solder ttings can be used, but extreme
care must be taken to ensure the plastic coating of the unit casing is not damaged by heat. Push
t type ttings can be used for connection to the copper pipes.
The inlet connection to the cold water combination valve is 22mm compression. The Premier
Plus SystemFit outlet tting is suitable for connection to 22mm o/dia pipe (compression nut and
olive supplied). The outlet is also threaded 3/4” BSP male parallel should threaded pipe connec-
tions be preferred.
3.2 COLD WATER SUPPLY
A 22mm cold water supply is recommended, however, if a 15mm (1/2”) supply exists which
provides sufcient ow (see section 2.3) this may be used. More ow noise may be experienced
from small bore pipes due to the increased water velocity through them.
A stopcock or servicing valve should be incorporated into the cold water supply to enable the
Premier Plus SystemFit and its associated controls to be isolated and serviced.
3.3 COLD WATER COMBINATION VALVE (see Diagram 1)
The Cold Water Combination Valve is supplied loose, but must be plumbed in the inlet supply to
the Premier Plus SystemFit . The Cold Water Combination Valve can be sited anywhere on the
cold mains supply prior to the Premier Plus SystemFit unit. It can be located at a point where the
mains supply enters the premesis if this is more convenient.
The Cold Water Combination Valve is installed as a complete one-piece unit. The valve incorpo-
rates a factory set, non-adjustable Pressure Reducer/Strainer and a single Check Valve.
3.4 EXPANSION CORE UNIT (see Diagram 2)
Should a balanced pressure cold water supply be required to cold water outlets, such as ther-
mostatic shower mixer valves or combination taps, the cold water balanced draw off connection
should be taken from between the Cold Water Combination Valve and the Expansion Core Unit
(see Diagram 3). Branches to cold drinking water outlets should be taken directly from
the mains supply.
3.5 POTABLE WATER EXPANSION VESSEL
The potable water Expansion Vessel (grey vessel) accommodates expansion that results from
heating the water inside the unit. The unit is pre-charged at 3.5 bar. The Expansion Vessel must be
connected between the Expansion Core Unit and the Premier Plus SystemFit (see Diagram 3) using
the connection provided on the inlet pipe and exible hose supplied.. The location of the Expansion
Vessel should allow access to recharge the pressure as and when necessary, this can be done
Installation - General