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6 GENERAL OPERATION
6.11
Heating motorised valve:
When the room thermostat is calling for heat and the
Electrastream control unit is set for heat ON, the heating motorised valve will open
allowing water to the radiators.
Display icon ‘Valve V’ indicates valve is open
6.12
Pump:
The heating circulating pump is controlled by Electrastream Control Unit in
response to the room thermostat.
The pump has 3 speeds, it is normally set to speed 2 (II). Consult Electrastream installer
before changing this setting.
Display icon ‘Pump V’ indicates the pump is ON.
6.13
Room thermostat:
IMPORTANT: When a programmable room thermostat is used it should only be set to
call for heat when ‘Economy Tariff’ is available.
The room thermostat controls the heat within the property.
When the room thermostat is calling for heat and the Electrastream control unit is set
for heat ON, the heating circulating pump will run, pumping water through the
radiators.
Display icon ‘Therm V’ indicates the room thermostat is calling for heat.
6.14
TRI-CORE heater elements:
The three elements heat the water in the cylinder when the
Electrastream control unit is programmed for a heat cycle. The elements are switched
on and off by the control unit in response to the temperature within the cylinder as
detected by the temperature sensor. They have a staggered switch on sequence that
prevents sudden high load on the power supply.
The control unit also limits the use of the elements for efficiency.
For example: When the hot water within the cylinder is within 2° of the set Target 65 °C,
only one element will be on. When the hot water is between 2° and 4 °C below the set
target, then two elements will be on. When the hot water within the cylinder is below
6 °C of the set target, then all three elements will be on.
Display icons ‘Heat 1 ^’, ‘heat 2 ^’ and ‘heat 3 ^’ indicate that the elements are heating. If
a ‘!’ is displayed, this indicates a fault with the element, see Section 9.1.
6.15
Residual current device (RCD) :
The Electrastream system will be protected by a
residual current device, this will automatically switch off the electric supply if an earth
fault develops. This should be tested at least every three months.
6.16
Element resettable thermal trips:
Each of the three elements of the tri-core heater is
protected by a 16 Amp Resettable thermal trip, these have their reset buttons located
on the front of the Electrastream Control Unit (see Fig 13).
In the event of electrical overload on an element the relevant thermal trip will trip out,
when this occurs the button will pop up and the screen will display ‘!’ under the
relevant heat.
To reset the thermal trip:
1. Turn OFF the Electrastream mains isolating switch
2. Look at the three buttons; button(s) that are
protruding have tripped out.
3. Press the button in, if the button stays in when the
power is turned on, then trip has been reset.
However if the button pops out again a possible
fault exists – contact the installer.
The Electrastream will still operate with one or two
elements working, but this is not satisfactory and the
installer must be contacted to rectify the fault as soon
as possible.
CAUTION
HIGH VOLTAGE!
DO NOT REMOVE ANY
COVERS (INCLUDING
ROOM THERMOSTAT)
BEFORE ISOLATING THIS
UNIT
Fig. 13 Resettable thermal trips
