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Cont...
5 COMMISSIONING
5.1
IMPORTANT
it is the responsibility of the installer to ensure that the Electrastream
System is properly commissioned. Should the commissioning not be carried out, then
the manufacturers guarantee and any extended warranty, will become null and void.
Wet System
5.2
System flushing:
The pipework system should be flushed out prior to the Electrastream
being connected to ensure any contaminants/chemical residues and foreign bodies are
removed from elsewhere in the system.
5.3
Expansion vessel pressure – hot water: (Cream vessel)
The air pressure should be set to 0.1 bar greater than the system pressure and must be
set as part of the commissioning procedure.
Capacity 12 litres
If the hot water vessel needs to have its air charge checked or replenished, it should be
carried out as follows:
a) Isolate unit electrically
b) Isolate water supply using the isolating valves
c) Release the system water pressure by opening a system outlet (tap)
d) Check air charge at Schrader valve (under the cap) using a tyre pressure gauge
e) Replenish air charge to suit the system if required by injecting air into the vessel via
the Schrader valve using a car or bicycle pump, ensuring a system outlet valve
remains open during this procedure to allow the vessel to exhaust any excess water.
f) Close all systems taps, open the isolating valves and turn on electrical power.
g) After the pressure has been changed, commission the unit see Section 5.5 onwards.
5.4
Expansion vessel pressure – heating system: (Grey vessel)
Maximum charge pressure
1.5 bar
Maximum working temperature
90 °C
Maximum Working Pressure
3 bar
Capacity
8 litres (for maximum system expansion of 7 litres)
The vessel pre charged is factory set to 1.9 bar, therefore it must be adjusted to suit the
system before commissioning continues.
The expansion vessel is supplied mounted on the unit, this is suitable for systems with a
static head of up to 5 metres. If the static head is greater than 5 metres the charge
pressure of the expansion vessel will need to be increased. Increase the pressure using a
standard car tyre pump and pressure gauge when the system is empty (zero pressure).
Expansion vessels are suitable for systems requiring a maximum expansion of 7 litres
as detailed above. For systems requiring more expansion a second expansion vessel will
be required. BS7074 Part 1 includes information on this requirement.
Note: Normally expansion requirement is 4% of the system water content including the
unvented cylinder coil
5.5
Hot water system pre-fill check:
a) Check the hot water heating discharge pipes and tundish are correctly installed to
conform to the Building Regulations G3.
b) Check all pipe connections are water tight.
c) Check the drain valve is closed.
d) If fitted, check that the Scale Protection Device or water softener has been fitted
according to manufacturer’s instructions.
5.6
Filling hot water system:
a) Open all shut off valves
b) Open the incoming water isolating valve (mains stopcock) to the Electrastream and
allow the unit to fill.
c) Open all domestic taps in turn to purge the air
d) Check system for leaks including around the Tri-Core heater.
e) Check no water is discharging from any relief valves.
