Controlling The Central Heating; Setting The Hot Water Temperature; Domestic Hot Water (Dhw); Eco Mode - Worcester GREENSTAR HEATSLAVE II External 12/18 User Instructions

3.2.3 Controlling the central heating

▶ Set the programmer/timer to the correct time with the
required ON/OFF periods.
▶ Turn the room thermostat to the temperature required.
▶ Set thermostatic radiator valves to the required
temperature for each room.
Turning the central heating off during the summer
▶ Turn your programmer/timer to the off position.
▶ Please refer to the programmer/timer manufacturer's
instructions.

3.2.4 Setting the hot water temperature

The hot water temperature control knob sets the temperature
of the heat store. A high setting will give a higher hot water
temperature and greater quantities of hot water.
1. Turn the hot water temperature control knob to the desired
level between 1 and 8, this will be shown on the digital
display.
2. The tap symbol will be displayed to confirm that the hot
water setting is being changed.
3. The value is displayed during this process, press
exit or after five seconds of inactivity the boiler display will
return to the default screen.
Fig. 4

3.2.5 Domestic hot water (DHW)

The GREENSTAR HEATSLAVE II is microprocessor controlled
and at low DHW flow rates (washing hands etc), the burner will
not fire up immediately when the tap is opened as the heat
store will meet the demand, but at high flow rates (filling a bath
for example) the burner will fire up to boost the heat store and
meet the demand.
If DHW is OFF on the programmer, the appliance will still supply
DHW using heat stored in the tank, but it will not reheat the
tank, therefore the amount of water available is limited but is
adequate for washing up, filling basins etc.
We recommend that DHW is timed off overnight and when the
home is unoccupied to save energy. The timer should be set for
at least half an hour before normal hot water demands are
expected to reheat the heat store.
Greenstar Heatslave II External
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ErP – 6 720 813 722 (2014/09)
When reheating the heat store the controls will reclaim heat
from the boiler for the tank, this means that the pump will run
(and the blue light will be on) for some time after the burner has
turned off whilst heat reclaiming takes place.
WARNING: Care should be taken when using
slow running taps and showers, as in some
circumstances, the combination of low water
flow rate and high setting of the hot water
control thermostat can result in very hot water.

3.2.6 Eco mode

Domestic hot water eco mode
Eco mode is an energy saving feature which alters the cycling
function of the burner for heating the heat store tank. In normal
operation the burner will fire more frequently between
demands in order to maintain a stored temperature close to the
hot water set point you have entered. In Eco mode, the burner
fires less frequently between demands meaning that the heat
store temperature is maintained at a lower average level, but
the tank set point remains the same.
to
By selecting Eco mode you will be using less energy as the tank
is allowed to cool a little more before reheating to the set point.
Selecting eco mode
1. Press and hold
energy saving Eco mode, when Eco mode is active, "Eco"
will be displayed.
Fig. 5
Exit eco mode
▶ To exit ECO mode, press and hold
seconds, "Eco" will disappear.
Using your boiler
for at least four seconds to enter the
eco
for at least four
eco
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