Honeywell ST799 User Manual

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
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