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
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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

TIME OF DAY
DAY / COPY DAY BUTTON
(OR PROGRAMME T IME)
LCD DISPtAY
HEATING CONTROL SELECTOR
HEATING ON INDICATOR ------i~J: m; ;;;;;:;;;;;-:-::,:,:,~it :_:_:_ -_-_ \JI _,
HOT WATER CONTROL SELECTOR
HOT WATER-ON INDICATOR
PROGRAMME OVERRIDE OR TIME +/- BUTTONS
SETTING THE PROGRAMME TIMES
The unit has two ON/OFF programme times
for each day of the week to provide flexible
time control for your Heating and Hot Water
system. To help you set your personal
programme quickly, a built-in programme
has been incorporated with commonly
used programme times. This programme
is selected automatically when the unit is first
connected to the mains power or when the
RESET button is pressed.
Each programme time can be set between
3.00am and 2.50am (on the next day) to allow
you (6 programme past midnight, if required.
1 Move the AUTO/SET selector to the first
ON position (second from left). The first ON
time will now be flashing in the display to
indicate it can be changed.
2 Use the DAY button to select the day to be
programmed.
3 Press the 1±1 or El buttons to set the first ON
time.
Each press of the button will change the time
by 10 minutes. Holding the button down for
more than a few seconds will change the
time quickly. The display will stop flashing to
indicate the time has been set.
4 Move the AUTO/SET selector to the first
OFF position. Set the first OFF time using
the 1±1 or El buttons.
5 Move the AUTO/SET selector to the
second ON position. Set the second ON
time using the 1±1 and El buttons.
6 Move the AUTO/SET selector to the
second OFF position. Set the second OFF
time using the 1±1 and El buttons.
7 You now have two choices how to set the
programme for the next day:-
Choice 1
STEP DAY. Press the DAY button to
step the day marker to the next day.
The ON/OFF times can now be set by
following steps 1 to 5 above. Repeat this
process until every day of the week has
been set.
Choice 2
STEP DAY & COPY. Press and hold down
the DAY button for at least three seconds.
The day marker for the next day will
appear and, at the same time, the current
day marker will start to flash to indicate the
copy function is in progress. Repeat this
process to copy the current day's pro-
gramme into several days of the week if
required.
8 Move the AUTO/SET selector to the
AUTO position to complete setting the
programme times.
REVIEWING AND CHANGING PROGRAMME TIMES
To review/change the ON/OFF programme
times move the AUTO/SET selector to
each of the ON/OFF positions in turn.
Press the DAY button to select different
days. Any time can be adjusted by using
the 1±1 or El buttons.
2 Move the AUTO/SET selector to the AUTO
position to complete reviewing/changing
the programme times.
SETTING THE CORRECT DAY & TIME
1 Move the AUTO/SET selector to the DAY/
CLOCK position. The display will now be
flashing to indicate it can be changed.
2 Press the DAY button to select the correct
day.
3 Press the 1±1 or El button to set the correct
time of day.
*NOTES*
(i) On 12 hour clock versions ensure the AM or
PM marker is correct. If not, adjust the time
by a further 12 hours.
(H) Programme times cannot be set out of
sequence. If the El button is being
pressed, the time will stop changing
when it equals a previous programme
time. If the 1±1 button is being pressed,
subsequent programme times will be
pushed forward along with the one being
set.
Each press of the button will change the
time by one minute. Holding the button
down for more than a few seconds will
change the time quickly. The display will
stop flashing to indicate the time has been
set.
4 Move the AUTO/SET selector to the AUTO
position to complete setting the day and
time.
(iii) If the AUTO/SET selector is accidentally
left in an ON /OFF or DAY/CLOCK position
for a period of 10 minutes, the unit will
start to operate as if it had been left in
AUTO. The display will flash when this
occurs to remind you to move the selector
to the correct position.
(iv) If installed as a Weekday-Weekend pro-
grammer, the day marker will be displayed
as ablock of days (MON ..... FRI or SAT .....
SUN) when setting the programme times.
The DAY button will switch between the
Weekdayand Weekend programmes when
pressed.
IF THE DISPLAY REMAINS BLANK AFTER CONNECTING THE POWER OR IF YOU WANT TO RESET
THE UNIT BACK TO THE ORIGINAL BUILT-IN PROGRAMME, PRESS THE RESET BUTTON WITH THE
TIP OF A PEN OR PENCIL
BUILT-IN YOUR PERSONAL PROGRAMME
TIME TIMES MON TUE WED THU
FRI SAT SUN
Time1 6.30am
Time2 8.30am
Time3 4.30pm
Time4
10 .30pm
,._ ____ WEEKDAY PROGRAMME----~•+- WEEKEND-+
PROGRAME

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