GAH Electrastream User And Installation Instructions Manual page 36

CAUTION
The main supply must be turned
OFF and water drained from the
Accumulator before lowering the
charge pressure, failure to do so
could result in damage to the
diaphragm.
If in doubt consult GAH (Heating
Products).
26. Set times to suit economy tariff.
27. Set cylinder thermostat temperature to 65°C - (8) Target 65°C.
28. If heating/hot water is not On press Boost
29. Wait for the cylinder and heating to heat up.
30. Check for leaks and bleed the system again when it is up to temperature.
31. Check pressure gauge red arrow, this will show the heating system working
pressure. This should be less than 2.8 Bar.
32. Check operation of Electrasteam Controller
HEAT 1 Indicates Element 1 is ON
HEAT 2 Indicates Element 2 is ON
HEAT 3 Indicates Element 3 is ON
VALVE Indicates Heating Valve is OPEN
PUMP Indicates Heating Pump is ON
THERM Indicates Room Stat is calling for heat.
When timer is set for heat and the room stat is set above ambient - the motorised
valve should be open and the pump should be running. When the room stat is reset
below ambient the pump should stop and the valve should close. When the timer is
not set for heat the pump should not run and the valve should be closed regardless
of room stat setting.
33. Fill in details in the Benchmark Logbook.
5-1.2 Accumulator Pressure
Accumulators are supplied by GAH with a preset air charge of 2 Bar (28/30psi). The
Combination Valve supplied with the Electrastream Plus has an integral pressure
reducing valve fixed at 3.5 Bar. Therefore there is a pressure differential of 1.5 bar
between the system pressure and the air charge of the Accumulator.
When the incoming mains pressure is less than 3.5 Bar the pressure differential will be
higher than 1.5 Bar and the Accumulator will not fill sufficiently, therefore it may be
necessary to lower the Accumulator air charge pressure.
The procedure for changing the Accumulator pressure is given below, this can be done
before the system has been filled. It may be done after the system has been filled and
tested, providing the incoming main has been turned OFF and the water drained from the
Accumulator. Failure to do this may result in false pressure reading and damage to the
butyl diaphragm.
If mains pressure is 3.5 Bar or above, changing the Accumulator charge pressure will not
be necessary.
Adjusting Air Pressure
1. Record mains pressure.
2. Turn main supply OFF.
3. Turn on cold outlets to empty Accumulator.
4. Remove black cap from top of Accumulator check/confirm Accumulator pressure
with pressure gauge.
5. Lower air charge so that is 1 to 1.5 Bar below mains pressure.
Minimum Accumulator pressure is 0.5 bar to 0.8 Bar.
COMMISSIONING COMMISSIONING COMMISSIONING COMMISSIONING COMMISSIONING
. and set room stat for heat.
Cylinder is heating up
Heating is On
5 5 5 5 5
5 5 5 5 5
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