OPERATING
YOUR
PROGRAMMER
For
normal operation the AUTO/SET selector
must be
in
the AUTO position.
Red
indicator lamps show
when
the Heating
or
Hbt Water
is
switched ON.
The
two lower selectors are used to control
your Heating and Hot Water
as
follows:
HEATING SELECTOR
OFF
The
heating will remain
OFF
perma-
nently.
CONT
The
heating will remain ON perma-
nently.
TWICE
The
heating will be switched ON and
OFF automatically
at
the programme
times.
ONCE
The
heating will be switched ON
automatically after the first pro-
gramme
ON
time and
OFF
at the last
OFF time.
The
first OFF and second
ON times will be ignored.
HOT WATER SELECTOR
The
HOT WATER selector operates
in
the
same manner
as
described above for the
Heating.
119
Psalter Lane
Sheffield
South Yorkshire
S11
8YR
01142
556
451
CHANGE
The
two
CHANGE buttons switch the output
ON
or
OFF (without altering the programme)
when the AUTO/SET selector
is
in
the AUTO
position and the HEATING and/or HOT
WATER selectors are set to ONCE
or
TWICE.
When
the indicator lamp
is
ON, pressing
the
CHANGE button switches the output OFF
until the next programme ON time.
When
the indicator lamp
is
OFF, pressing the
CHANGE button switches the output ON until
the
next programme OFF time.
POWER FAILURE
This
unit has a built-in battery
to
ensure.
correct operation after a mains power cut.
No action should be necessary following a
power cut
of
up to 7 days. Longer power cuts
may require
you
to reprogramme the unit.
Honeywell Control Systems Limited
Arlington Business Park
Bracknell
Berkshire RG12 1EB
01344 826 000
Honeywell
Helping
You
Control Your World
ST799
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INTRODUCTION
The
ST799
electronic programmer
is
used to
control the ON/OFF timing of your heating
and hot water system.
The
system may also
incorporate a
room
temperature thermostat
and a hot water' cylinder thermostat to switch
the heating appliance ON and
OFF
to main-
tain the correct temperatures.
ST799 INCORPORATES THE FOLLOWING
FEATURES:
• 7-day programme (or weekday-weekend)
• Independent Heating and Hot Water
control
• Choice of
two
ON/OFF programme times
per day {TWICE)
or
one programme time
per day {ONCE)
• Programme times can be copied from day
to day
{DAY)
• Built-in programme
• Temporary ON/OFF override {CHANGE)
• Continuous ON
or
OFF control {CONT.
or
OFF)
• RESET button
Honeywell
AM
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