GAH ITD 130 Technical And Installation Manual Download

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Introduction

INTRODUCTION 1

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1-1.1 The Dualstream System

The Dualstream systems by GAH Heating Products have been developed as an advanced
solution for domestic hot and cold water installations. A Dualstream system will increase
the water volume and maintain the mains pressure to both the hot and cold supplies
when more than one outlet is in use at the same time.
Dualstream has been designed to function on the minimum standard for domestic water
supply as provided by local water authorities - which is 1 Bar at 9 litres per minute.
GAH offer full technical assistance and design service to enable the optimum Dualstream
system to be configured to overcome situations where poor mains supply and pressure
are considered a problem.

1-1.2 How the Dualstream system works

The system mainly comprises:- an unvented direct or indirect cylinder, an accumulator

(cold water storage vessel), a combination valve and an expansion relief valve.
The accumulator has an internal controlled butyl diaphragm, incoming cold water is
stored within this diaphragm at mains pressure. The air space between the diaphragm
and the accumulator case is pressurised, this balances the supply and maintains
pressure to the unvented hot water cylinder and cold outlets. When hot and cold water
outlets are turned on the stored water from the accumulator supplements water from the
incoming main, this results in consistent pressure and flow to all taps, showers and baths
when outlets are used simultaneously. Pressure will be sustained for as long as the
accumulator is holding sufficient volume of water.

1-1.3 System Comprises

An unvented hot water cylinder pre-plumbed with all valves and controls with easy
access pipe connections for quick, trouble-free installation.

Cylinder Thermostat and Thermal Cut-Out Thermostat.

An accumulator (cold water storage) and associated fittings which can be
positioned anywhere in the dwelling, outhouse or garage, refer to 4-2.6.

A Motorised Valve for connection to the heating systems flow to cylinder.

1-1.4 Dualstream System Features

All taps and showers are at maximum ‘System Pressure’.

Provide increased water flow rate to both hot and cold water outlets.

Suitable for properties with very low mains flow rates (9 litres per minute).

Balanced Hot and Cold water supply pressures.

Minimum pressure drop when more than one tap is in use.

More than 25% less pipework than traditional systems.

No loft storage tank - no risk of water stagnation.

Completely sealed system - wholesome water to all cold taps.

No tank filling noise.

10. Dualstream utilises GREEN TECHNOLOGY.

Note
For components supplied with system refer
to page 25.

Note
It is recommended to obtain the nominal
mains pressure and flow rate before
installing a Dualstream system, this will
enable the optimum system to be
configured to suit conditions.

Note

Direct cylinder heated by immersion
heater. Indirect cylinder heated by boiler
(also has immersion heater).

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This Handbook has been compiled to assist in the Installation and Operation of GAH (HEA

This Handbook has been compiled to assist in the Installation and Operation of GAH (HEATING

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