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6.2 Motorised valve
To comply with regulations governing the installation of indirect unvented cylinders, a motorised valve must be
fitted in the primary pipework. The motorised valve will act as a positive energy cut-out should the additional
cylinder thermal cut-out operate. The motorised valve will also control the temperature of the domestic stored
water via the additional cylinder thermostat. The unit can be installed on an "S" or "Y" plan system. Please follow
the wiring instructions carefully.
6.4 Digital Dual Cylinder Thermostat
The Digital Dual Cylinder thermostat has real safety and energy saving benefits and provides accurate temper-
ature control. It also features a clear and informative LCD display. Leave the cylinder thermostat set at 60°C
in line with current government guidelines. Lowering the temperature will substantially reduce the amount of
usable hot water available on a daily basis and could result in bacterial growth unless the legionella facility is
activated (THIS FUNCTION IS ACTIVATED AS STANDARD see label on side of thermostat, for commission-
ing purposes please disable this function selecting OF in display see 6.4.1 below).
The legionella mode gives a weekly automatic one hour "boost" to above 60°C which kills any legionella bac-
teria, This function is adjustable allowing the duration of the legionella override to be adjusted from 1 to 7 days
or completely disabled to operate as a conventional Dual Cylinder Thermostat. The LCD display shows the
current water temperature and the user defined water temperature, while the red LED indicates that the unit is
calling for heat. The sensitive electronic sensors operate at a far greater accuracy than conventional thermo-
stats. The dial makes it easy to set the required controller temperature (between 25°C and 65°C) .The second
(limit) safety thermostat is pre-set to 80°C with a concealed manual reset, to comply with building regulations.
Should the safety cut out be brought into operation, the motorised valve will operate and close down the pri-
mary flow to the cylinder. To reset the safety cut-out and the motorised valve the reset button must be
pressed in.
Wiring Diagram
Also see S-plan and Y-plan wir-
ing page 7 and 8.
This product requires a fused
permanent Live and Neutral
supply.
6.4.1 Adjusting the 1 Hour Boost
The thermostat has user defined settings where the duration of the legionella Override/Boost can be adjusted
from 1 to 7 days or completely disabled to operate as a conventional dual cylinder thermostat.
1.
To disable or adjust he legionella override/ boost turn the unit off by pressing and holding down the
HOLIDAY button until an audible click is heard.
2.
Release the button and after approx. 10 seconds press and hold the holiday button again until an
audible click is heard and the LCD display flashes
3.
Release the button and use the HOLIDAY button to choose between disabling the override/Boost
(OF in display) or setting delay between boost/override from 1 - 7 days (1-7 in display)
4.
Once selected release the button and the unit will return to the user set position within 5 seconds
6.4.1 Holiday Mode
This is the black button located under the display. Press and hold the holiday switch
for a minimum of 10 seconds until you hear an audible click, and this switches the
digital Dual Cylinder Thermostat off completely so there is no water heating and
no weekly "boost" heating.
When in Holiday mode, the display is off. This feature should only be used when
the property is vacant for extended periods and there is no requirement for water
heating or for the weekly "boost". Pressing and holding the holiday switch again
(for a minimum of 10 seconds until you hear an audible click) will restart the Elec-
tronic Dual Cylinder Thermostat, the display will show the cylinder temperature
and the weekly "boost " will immediately start, and recur every 7 days at the same
time.
OSO Hotwater AS can not be responsible if alternative wiring plans are used. Important: Before resetting the safety cut-out
or altering the thermostat setting isolate electrical supply to the unit before removal of the lid.
6
Holiday mode
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