WHAT IS A TImer?
General Description
Your Honeywell ST9100S provides timing control for your central heating system,
letting you set
ON
and
OFF
periods to suit your own lifestyle.
The ST9100S does not directly control the temperature but works together with other
temperature controls, such as room thermostats, to control your heating system in
your home.
ST9100S has 1-day programming and 2 on/off periods per day, making it very simple
to use.
ST9100S also has a Boiler Service reminder / Shut-down feature, which helps
ensure your gas boiler is regularly serviced in compliance with UK Gas Safety
regulations. For more details see pages 16, 17.
The following instructions explain how to programme and use the ST9100S to provide
the most home comfort at the least cost.
The way to use a Timer
Think about the time periods when you are typically in the house and when you are
not. These are the times you should use as the basis for the programmes. It will be
necessary to allow some heat-up time for the heating system after periods when it
has been off – this would typically be 1 - 1½ hours, depending on your house and
your preferences.
Other features are commonly available on the
Timer
to enhance comfort and
convenience, for example,
OVerrIDe
,
eXTrA HOUr
, and
mODe
buttons.
A typical use of the
OVerrIDe
feature is when you return home unexpectedly for
the rest of the day and the heating is off. Just press the
OVerrIDe
button and the
heating will come on until the next programme time, at which point it will follow the
normal programme. The advantage here is that you do not have to remember to
switch off because the normal time programme does this for you.
A typical use of the
eXTrA HOUr
button would be if you returned to the house for
a short period when t he heating was off. Pressing the
eXTrA HOUr
button gives
you 1, 2, or 3 hours of heating, exactly when you need it. Another typical use is when
the heating is already on and you want it to stay on a little longer - just press
eXTrA
HOUr
and, for that day only, an hour will be added to the end of the time at which
heating normally goes off.
The
mODe
button allows you to select how you want to operate your heating. The
most obvious use is to switch heating
OFF
during the summer months, but you may
also use this feature if you take a mid-week day off work, you can then set the
mODe
to
ONCe
to keep the system
ON
during the day from the first programmed
ON
time
till the last programmed
OFF
time.
