Honeywell ST6400A User Manual

USER GUIDE

TO BE LEFT

WITH USER

ST6400A

Programmer

42009084-006 R1

INTRODUCTION

The ST6400A programmer controls your central
heating system. It will enable you to select the
times when heating and hot water are switched

ON and OFF.

FEATURES

• 24 hour heating programme.

• 24 hour hot water programme.

• Two ON/OFF switching times per day.

• Built-i n program me with typi cal ON/OFF

times.

• Override buttons for heating and hot water.

• Extra hour buttons for heating and hot water.

• Built-in battery to prevent loss of programme

during power cuts.

• 12 hour am/pm or 24 hour clock format.

The ST6400A and other Honeywell controls in
your central heating system will provide comfort­able temperatures in your home when you want
them.

12 HOUR AM/PM or 24 HOUR CLOCK DISPLAY

Your programmer can operate on 12 hour am/pm
or 24 hour clock formats. To change the format,
ensure the setting slider is in the RUN PRO-
GRAMME position then press the + and - buttons
together for about 5 seconds. All the displayed
times will be automatically changed to the new
format.
Repeating this procedure will change the clock
display back to the original format.

OPERATING YOUR CONTROLLER

For normal operation the setting slider must be in
the RUN PROGRAMME position.
A red indicator lamp shows when the heating or
hot water is switched ON.
Two sliders are provided to select how the heat­ing and hot water are controlled.

The HEATING SLIDER has four positions:

OFF - The Heating will remain OFF.

AUTO - The heating will be switched ON and

OFF automatically according to the heating
programme.

ONCE - The heating will come ON at the rst

programmed ON time and go OFF at the last
programmed OFF time.

CONT. - The heating will remain ON continu-

ously.

The HOT WATER slider operates in the same
manner as described above for the HEATING

SLIDER.

EXTRA HOUR

The EXTRA HOUR buttons switch the heating or
hot water ON for up to 3 extra hours without alter­ing the programme. Pressing either button once
will give one extra hour, and the words HEATING
+1 HR or HOT WATER +1 HR show on the dis­play to conrm the button has been pressed.

When the red indicator lamp is OFF, pressing the
EXTRA HOUR button switches the heating or hot
water ON for just one hour.

When the red indicator lamp is ON, pressing the

EXTRA HOUR button extends the programmed
ON period by one hour.

Further presses of the EXTRA HOUR buttons will
increase the extra hour period by one hour for
each button press, up to a maximum of 3 hours.
The display will change to show the number of
extra hours, for example HEATING +3 HR or HOT
WATER +2 HR.

To cancel the extra hours, keep pressing the

EXTRA HOUR button until the HEATING + (1,2
or 3) HR or HOT WATER + (1,2 or 3) HR disap-

pears from the display.

OVERRIDE

The OVERRIDE buttons switch the heating or
hot water ON or OFF without altering the pro­gramme.

When the indicator lamp is ON, pressing the
OVERRIDE button switches the heating or hot
water OFF until the next programmed ON time.

When the indicator lamp is OFF, pressing the
OVERRIDE button switches the heating or hot
water ON until the next programmed OFF time.

RESET

To reset the programmer back to the original
built-in programme press the RESET button with
the tip of a pen or pencil.

POWER FAILURE

Your programmer has a built-in battery to ensure
correct operation after a main supply power cut.
No action should be necessary following a power
cut of up to 4 days. Longer power cuts may
require you to re-programme.

SETTING YOUR PROGRAMMER

SETTING THE CORRECT TIME

To set the correct time, open the ap on the front
of the programmer.

STEP1

Move the se tting
slider to the SET
TIME position. The
time on the display
will now be ashing
to indicate it can be
changed.

STEP 2

To change the time, press the + or - buttons until
the correct time is displayed.
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 slowly at
rst, then quickly.

STEP 3

Moving the setting slider to the next position com­pletes setting the time.

SETTING THE HOT WATER PROGRAMME

The h ot water programme has two ON/OFF
switching times per day. Each time can be set
between 3.00 am and 2.50 am (on the next day)
to allow you to programme the hot water to stay
on past midnight, if required.

STEP 4

Move the setting slider to the SET HOT WATER
position. The words HOT WATER will now be vis-
ible on the display and the rst ON time will now
be ashing.

STEP 5

Use the + and - buttons to set the rst ON time.
Each press of the button will change the time by
10 minutes.

STEP 6

Press the NEXT ON/OFF button once to display
the rst OFF time. Set this time using the + and ­buttons.

STEP 7

By pressing the NEXT ON/OFF and + or - but­tons the remaining ON/OFF times can be set.

*NOTE*

1. When pressing the + button, the next ON or
OFF marker may star t to ash. If this hap-

pens the next programme time will have been
changed. Press the NEXT ON/OFF button to
check and adjust this programme time if nec­essary.

2. When pressing the - button, the previous
ON or OFF marker may start to ash. If this
happens the previous programme time will
have been changed. Follow the procedure
in “REVIEWING PROGRAMME TIMES” to
check and adjust this time if necessary.

Moving the setting slider to the next position com­pletes setting the hot water programme.

SETTING THE HEATING PROGRAMME

The heating programme has two ON/OFF switch­ing times per day. Each time can be set between

3.00 am and 2.50 am (on the next day) to allow

you to programme the heating to stay on after
midnight if required.

STEP 8

Move the setting slider to the SET HEATING posi-
tion. The word HEATING will now be visible on
the display and the rst ON time will be ashing.

STEP 9

The required heating programme can now be set
by following the same procedure as “SETTING

THE HOT WATER PROGRAMME” in steps 5 to 7.

STEP 10

Moving the setting slider to the next position com­pletes setting the heating programme.

REVIEWING PROGRAMME TIMES

To review your hot water programme move the
setting slider to the SET HOT WATER position.
To review your heating programme move the set­ting slider to the SET HEATING position.
To review the programme times press the NEXT
ON/OFF button repeatedly. Any of these times
can be adjusted by using the + and - buttons.

+ AND

-

BUTTONS

LCD
DISPLAY

ON/OFF
MARKER

HOT WATER
INDICATOR

OVERRIDE
BUTTONS

HEATING
INDICATOR

EXTRA HOUR

BUTTONS

HEATING
SLIDER

SETTING
SLIDER

HOT WATER
SLIDER

NEXT ON/OFF
BUTTON

RESET

IF DISPLAY REMAINS BLANK AFTER SWITCH ON - PRESS RESET

3.00am

4.00am

5.00am

6.00am

7.00am

8.00am

9.00am

10.00am

11.00am

12.00am

1.00pm

2.00pm

3.00pm

4.00pm

5.00pm

6.00pm

7.00pm

8.00pm

9.00pm

10.00pm

11.00pm

12.00pm

1.00am

2.00am

3.00am

HOT WATER
HEATING

BUILT-IN PROGRAMME

3.00am

4.00am

5.00am

6.00am

7.00am

8.00am

9.00am

10.00am

11.00am

12.00am

1.00pm

2.00pm

3.00pm

4.00pm

5.00pm

6.00pm

7.00pm

8.00pm

9.00pm

10.00pm

11.00pm

12.00pm

1.00am

2.00am

3.00am

HOT WATER
HEATING

PERSONAL PROGRAMME