5
OUTSIDE
TAP
WATER
SOFTENER
BOILER
FLOW
BOILER
RETURN
CHECK VALVE
COMBINATION
VALVE
HOT WATER
SUPPLY TO
TAPS
EXPANSION
DISCHARGE
HTPV
DRAIN
DRAIN
ACCUMULATOR
UNVENTED
CYLINDER
BALANCED
COLD SUPPLY
TO TAPS
INCOMING
MAINS
SUPPLY
SINGLE
CHECK
VALVE
TUNDISH
PRV
HEATING
SYSTEM
FILL
KITCHEN
SINK COLD
TAP
PRESSURE
REDUCING
VALVE
EXPANSION
VESSEL
INTRODUCTION 1
INTRODUCTION 1
INTRODUCTION 1
INTRODUCTION 1
INTRODUCTION 1
Fig. 1-2a Schematic Installation - Standard Arrangement
All installations must comply with relevant regulations - refer to section 4-1.
1-2
System Layout
Fig. 1:2a shows a typical configuration of a Dualstream system with the accumulator and
hot water cylinder installed within close proximity of each other.
The Combination Valve comprises a non return valve, a pressure reducing valve and a
pressure relief valve (PRV). The pressure reducing valve limits the supply to the cylinder
at a pressure of 3.5 Bar.
A separate pressure reducing valve, set at 3.5 Bar is supplied, this should be installed to
limit the incoming main pressure. To maintain maximum mains pressure to the kitchen
tap and outside taps it can be fitted following these draw offs, when applicable. Failure to
fit the pressure reducing valve as specified will invalidate warranty.
A Single Check Valve is supplied, if one is not already fitted, this should be fitted to the
mains supply prior to any connections or take offs to prevent back flow and to maintain
accumulator pressure.
Supply to all the cold taps and outlets is taken from the Tee fitting at the base of the
accumulator.
Supply to the hot taps and outlets is taken from the cylinder in the traditional manner.
Provision must be made, as applicable, for:- outside tap, boiler/heating system fill and
water softener.
The cylinder HTPV Valve and the combination valve PRV should be plumbed to the
tundish (supplied), installation must comply with building regulations.
Three full bore lever valves are supplied, it is recommended to install these, one each:-
incoming mains to combination valve, hot supply from cylinder, cold supply from
accumulator.
Note
Alternative system layouts are possible
consult GAH Heating Products.
11111
IMPORTANT
Both pressure reducing valves
must be set to the same pressure.
