ThermoPlus AS2
User Operating Instructions
Programmable Room Thermostat
The Horstmann ThermoPlus AS2 is a battery powered Programmable Room Thermostat
that has been designed to make its operation very simple for the householder.
The built in automatic clock means it will not need setting or
adjusting for BST and GMT time changes.
The ThermoPlus will provide a pre-programmed temperature prole preset by your installer
and day-to-day user adjustments are carried out using just three buttons.
Being battery powered, the ThermoPlus AS2 is particularly suitable for use as a
replacement for older style room thermostats, without the need to disturb existing wiring.
1
The ThermoPlus AS2
The instructions contained in this user guide are designed to help
with the programming and operation of the unit.
Part 1 of these instructions explains the day to day operation of the AS2
Part 2 of these instructions describes programming the AS2
1 2 3 9
1 – Plus ‘+’ Button
2 – LED Indicator lights
3 – Installer Display
4 – ‘Warm/Cool’ Button
5 – Minus ‘-’ Button
2
4 6 8
5
7
6 – Standby Time/Set Button
7 – Increase/Decrease Buttons
8 – Prog/Exit Button
9 – Front ap shown open
Part 1 – Day to Day operation
The ThermoPlus AS2 has been designed to be a simple to use thermostat, requiring
minimal user intervention with a pre-programmed heating prole. Simple temperature
adjustments can be easily carried out by using the ‘+’ and ‘-‘ buttons. The indicator lights
react to any temporary user adjustments, with the LED indicators working in the following
way;
‘Warm’ is shown by two red lights and ‘Cool’ is shown by a single blue light. The centre
button marked ‘Warm/Cool’ allows you to toggle between the warm and cool settings.
When one or more red lights are on, you can increase the temperature by pressing the ‘+’
button. For example, press once to go up by 1°C or press twice to go up by 2°C.
When the two or three red lights are on, the temperature can also be lowered by using
the ‘-‘ button. For example, press once to go down to the warm setting temperature and
press again to go down to 1°C below warm setting temperature. (Maximum adjustment
to warm temperature +/- 2°C). The blue light indicates the unit is working to the lower
set temperature. Please note that the ‘+’ or ‘-‘ buttons will have no effect on the lower
temperature setting.
Under the ap is a blue button (6). During the summer, or when you want your central
heating off for long periods, for example if you go on holiday, press the blue button and
close the ap. When you want to go back to normal operation, open the ap and press the
blue button again, remembering to close the ap once nished.
Both the Warm and Cool temperature settings can be permanently adjusted, this operation
is detailed on page 4.
Power Down Mode
During normal operation the AS2 will go into Power Down Mode, this is to maximise the
life of the 3 x AA batteries tted. Normal operation will continue during this mode, and
the heating will be unaffected. The result of the Power Down Mode will mean that the LED
indicators will not be displayed and LCD will not be illuminated, although the ‘Warm’ or
‘Cool’ temperature will be displayed.
To ‘wake up’ the AS2 press the ‘Warm/Cool’ button for 5 seconds, this will then illuminate
both the LED and LCD displays for a period. Any adjustment can then be made, the Power
Down Mode will commence again approximately 8 seconds after the last button press.
3
Warm and Cool Temperature Adjustment
The Warm and Cool target temperature
settings on the ThermoPlus AS2 are
fully adjustable. To change a target
temperature it is rst necessary to press
the centre button to bring up the ‘Warm’
or ‘Cool’ setting (indicated by the red or
blue LED indicators).
By using the up/down keys under the
ap the Warm/Cool temperature can be
increased or decreased to the desired
temperature setting.
PLEASE NOTE – it is not possible to set the
warm setting to below that of the cool
setting or vice versa.
Once a new temperature has been set in
either the Warm or Cool setting the AS2
will continue to use this setting until the
next manual adjustment.
Press here to select
Warm or Cool
To increase
Press
To decrease
Press
4
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