Technical data
INSTALLATION – GENERAL
PIPE FITTINGS
All pipe ttings 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.
COLD FEED
A 22mm cold water supply is recommended, however, if a 15mm (1/2”) supply exists which provides sufcient ow, this
may be used (although more ow noise may be experienced).
A stopcock or servicing valve should be incorporated into the cold water supply to enable the PremierPlus cylinder and its
associated controls to be isolated and serviced.
COLD WATER COMBINATION VALVE ASSEMBLY (FIG. 2, page 5)
The Cold Water Combination Valve can be connected anywhere on the cold water PremierPlus supply prior to the Expansion
Vessel (see Fig. 6, page 11). The Cold Water Combination Valve is installed as a complete one-piece unit. The valve incorporates
the Pressure Reducer, Strainer, Expansion Valve and Check Valve. Ensure that the valve is installed with the direction of ow
arrows pointing in the right direction. No other valves should be placed between the Cold Water Combination Valve and
the PremierPlus unit. The Expansion Valve connection must not be used for any other purpose.
Fig. 2: Cold water combination valve
Expansion valve
Cold mains
connection
(22mm)
Expansion valve
outlet (15mm)
Outlet connection
(22mm)
Pressure reducing
valve cartridge
(3.5bar)
DRAIN TAP
A suitable draining tap should be installed in the cold water supply to the PremierPlus cylinder between the expansion valve
(see Fig. 6, page 11) and the heater at as low a level as possible. It is recommended that the outlet point of the drain pipework
be at least 1 metre below the level of the heater (this can be achieved by attaching a hose to the drain tap outlet spigot).
5