GAH Electrastream User And Installation Instructions Manual page 6

Note
All installations must comply with relevant
regulations - refer to section 4-1.
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Softeners, for information contact
GAH (HEATING PRODUCTS) LTD.
1-2.1 Hot & Cold Water Supply
Refer to fig. 1-2a for Electrastream.
Refer to fig. 1-2b for Electrastream Plus.
The incoming mains water supply is connected to the combination valve which is
assembled to the unvented indirect hot water cylinder. The combination valve has an
integral check valve. A double check valve is supplied, this is only required to be fitted if
back syphonage is possible from any item fitted prior to the combination valve. A
connection must be provided for the system fill.
Also provision has to be made for water softener and outside tap as applicable.
The combination valve limits the incoming pressure to 3.5 Bar, it has an integral non-
return valve and pressure relief valve (PRV).
Supply to the hot outlets is taken from the cylinder and mixed with cold water by the
thermostatic mixing valve (supplied), this ensures that a safer lower temperature hot
water is available at outlets.
ELECTRASTREAM ONLY
Cold supply to all outlets is taken direct from the main supply. If the mains pressure is
high (over 3.5 Bar) a pressure reducing valve is recommended.
ELECTRASTREAM PLUS
The incoming mains supply is connected to the combination valve. Once passed the
valve it supplies the accumulator and the hot water cylinder.
Supply to the cold outlets is taken from a Tee fitting at the base of the accumulator.
1-2.2 System Control
The system is controlled by a purpose designed Electrastream Control unit, this controls
the hot water and heating ON/OFF times together with the heating pump and valve. The
control also has a dedicated programme that ensures efficient use of electricity by
selecting how many of the three immersion heater elements are required to meet the
current demand for heating or hot water. It also incorporates an automatic heating
element test function.
1-2.3 Heating System
The heating system has water filled radiators and is a standard 'sealed system'. The
water for the heating is heated by being pumped through the indirect coil of the indirect
cylinder. A room thermostat and the Electrastream Control unit's programmable timers
control the circulating pump and motorised valve.
1-2.4 Electric System
The unvented cylinder is heated by a 9kW (combined 3 x 3kW) titanium immersion
heater. This is controlled by the cylinder temperature sensor and the Electrastream
Control unit.
Electrastream is designed to make full use of economy tariff electricity supplies and the
wiring must be arranged to make full use of this.
1-2.5 Output
The 9kW immersion heater provides 30,000 Btu (9kW) for heating and hot water.
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