Electronic Programmable Room Thermostats
HC75-1 with integral sensor.
HC75A-1 with remote sensor.
SETTING INSTRUCTIONS
SETTING THE CLOCK
After the recessed RESET button
has been pressed the display appears
as shown, with the colon blinking,
and all the factory pre-set conditions
will be present.
To set the clock to the correct time,
press and release the button marked
PROG. The digits blink.
Press the DAY button (the digits stop
blinking) until the correct day number
is shown. (1 = Monday).
Press and release the + or - buttons to change the time by one minute,
or press and hold down to change the time in ten minute steps.
When the time is correct press PROG to start the clock and continue
setting sequence.
SETTING THE EVENT TIMES & TEMPERATURES
The first event (time and temperature)
is displayed, together with the day or
days when it is active. Note that the
day number(s) displayed will be that
of the current day. In 7 Day mode
only a single day number will be
displayed, in 5/2 Day mode either
12345 or 67 will be displayed.
Event No.
AUTO
HEAT
COOL
OFF
AUTO
ON
To step through the six available
events press and release the NEXT
button.
Whilst each event is on display, it
may be altered as required.
Selecting an event time
Press and hold down the + o r - buttons
to change the event time in ten minute
steps. Press and release to change
by one minute.
Selecting a heating temperature
Event No.
AUTO
HEAT
COOL
OFF
AUTO
ON
Press and release the s button to
raise the HEATING control
temperature by 0·5°C (1°F), or press and release the t button to lower
the HEATING control temperature by 0·5°C. Press and hold down
these buttons to make larger changes to the control temperature.
Selecting a cooling temperature
Press and release the button to raise the COOLING control
temperature by 0·5°C (1°F), or press and release the button to lower
the COOLING control temperature by 0·5°C. Press and hold down
these buttons to make larger changes to the control temperature.
Dead Band
Whilst adjusting the HEATING and COOLING temperatures it will be
noted that the two temperatures never become closer together than
2°C(5°F). This designed-in dead band prevents the heating and
cooling equipment from switching simultaneously.
7 day mode
Cooling
Control
temp.
Day
5/2 day mode
Cooling
Heating
Control
Control
temp.
Days
Heating
Control
temp.
temp.
Time
Time
Selecting an 'OFF' event
If there is a demand to turn 'OFF' rather than turn down the heating or
turn up the cooling, for example during unoccupied periods, an 'OFF'
event can be selected.
Selecting a programmed 'OFF' event for heating: use the t button to
lower the heating set temperature to its minimum value which is 'OFF',
the characters 'OF' will replace the heating control temperature.
Selecting a programmed 'OFF' event for cooling: use the button to
raise the cooling set temperature to its maximum value which is 'OFF',
the characters 'OF' will replace the cooling control temperature.
When all events for the day(s) on
display are as required press DAY to
show the following day's events.
The display will appear similar to one
of the diagrams on the right,
depending on whether the HC75 has
AUTO
HEAT
COOL
OFF
AUTO
ON
7 day mode
been set up for 7 day or 5/2 day
mode.
Use the , +, -, s, t, , NEXT
buttons to alter the events as required,
OR
If the previous day's programme is to
be repeated, press COPY to repeat
AUTO
HEAT
COOL
OFF
AUTO
ON
5/2 day mode
those events with just one button
press.
(Pressing COPY when in 5/2 mode will repeat the events programmed
for days 1 to 5 at the weekend).
Use the DAY and NEXT buttons to check all the events programmed,
using the +,-,s, t, , buttons to make alterations to each event as
necessary.
When all the events for every day are
as required, press PROG to return to
RUN mode, with the colon blinking.
The heating/cooling system will now
AUTO
HEAT
COOL
OFF
AUTO
ON
be controlled to provide the
temperatures programmed.
Refer to the USER'S GUIDE for details of the manual over-rides
available during day to day operation.
1
FACTORY PRE-SET PROGRAMME
The table should be used to record the users programme. If the HC75 has been configured for
5/2 day control only days 1 and 6 need be recorded.
EVENTS
AMME
OGR
PR
DAYS
FORMAT
Pre-set
1
2
3
4
5
6
7
If the unit is to operate in 5/2 day mode, then only days 1 and 6 need be completed.
32°C
31°C
30°C
29°C
28°C
27°C
26°C
25°C
24°C
23°C
22°C
21°C
20°C
19°C
18°C
17°C
16°C
15°C
14°C
13°C
MIDNIGHT 3:00 6:00 9:00 12:00 15:00 18:00 21:00 MIDNIGHT
USER’S
(Monday)
Pre-set
USER’S
(Tuesday)
Pre-set
USER’S
(Wednesday)
Pre-set
USER’S
(Thursday)
Pre-set
USER’S
(Friday)
Pre-set
USER’S
(Saturday)
Pre-set
USER’S
(Sunday)
COOLING
FACTORY
PRE-SET
PROGRAMME
HEATING
123456
CLGHTGCLGHTGCLGHTGCLGHTGCLGHTGCLGHTG
TIME TIME TIME TIME TIME TIME
25.0 20.0 27.0 15.0 25.0 20.0 27.0 15.0 25.0 21.0 27.0 15.0
6:30 8:30 11:30 13:30 16:30 22:30
25.0 20.0 27.0 15.0 25.0 20.0 27.0 15.0 25.0 21.0 27.0 15.0
6:30 8:30 11:30 13:30 16:30 22:30
25.0 20.0 27.0 15.0 25.0 20.0 27.0 15.0 25.0 21.0 27.0 15.0
6:30 8:30 11:30 13:30 16:30 22:30
25.0 20.0 27.0 15.0 25.0 20.0 27.0 15.0 25.0 21.0 27.0 15.0
6:30 8:30 11:30 13:30 16:30 22:30
25.0 20.0 27.0 15.0 25.0 20.0 27.0 15.0 25.0 21.0 27.0 15.0
6:30 8:30 11:30 13:30 16:30 22:30
25.0 20.0 27.0 20.0 25.0 20.0 27.0 20.0 25.0 21.0 27.0 15.0
7:30 9:30 11:30 13:30 16:30 22:30
25.0 20.0 27.0 20.0 25.0 20.0 27.0 20.0 25.0 21.0 27.0 15.0
7:30 9:30 11:30 13:30 16:30 22:30
EVENT 1
5°C
DEAD
BAND
EVENT 2
EVENT 3
EVENT 4
EVENT 5
EVENT 6
NOTES ON SETTING EVENT
TIMES
If, during the event checking and setting
procedure, no buttons are pressed for more
than two minutes then the HC75 will return to
RUN mode automatically. If this appears to
have occurred, it is advisable to re-check the
programme to ensure that it is as required.
When setting event times and temperatures
it is not possible to set event times out of
chronological order.
Event 1 may be set at any time from 0:00 to
23:59 (but would normally be in the morning).
Event 2 may be set at any time between event
1 and 23 hours, 59 minutes after event 1.
Event 3 may be set at any time between event
2 and 23 hours, 59 minutes after event 1.
Event 4 may be set at any time between event
3 and 23 hours, 59 minutes after event 1,....
and so on.
If the event time being set is moved past
midnight into the following day then the number
of the following day will blink.
Event 6 on day
6 set after
midnight.
When using the + button to adjust events 1 to
5 and the event time being adjusted becomes
the same as the following event time, then
both are changed simultaneously. This applies
to all subsequent event times reached and is
demonstrated in the lower diagram on the
left.
When using the - button to adjust events 2 to
6 and the previous event time is reached the
- button ceases to respond.
The factory pre-set programme may be
reinstated by pressing the recessed RESET
button. This will however reinstate all the
factory pre-set conditions, so that the clock
type, temperature scale and optimum start
period (if enabled) may also have to be re-set.
32°C
31°C
30°C
29°C
28°C
COOLING
27°C
26°C
25°C
24°C
23°C
EXAMPLE
22°C
USER SET
21°C
20°C
PROGRAMME
19°C
18°C
17°C
16°C
HEATING
15°C
14°C
13°C
MIDNIGHT 3:00 6:00 9:00 12:00 15:00 18:00 21:00 MIDNIGHT
EVENT 1
3°C
DEAD
BAND
MANUAL OVERRIDE = USED
AT 9 AM TO RAISE
TEMPERATURE BY 2°C.
PROGRAMMED 3°C DE AD
BAND MAINTAINED.
EVENTS
2, 3 & 4
EVENT 5
EVENT 6
In the above diagram, event 2 has been moved to 15:30. Note that events 3 & 4 have also been
moved to that time, and that the following control temperature will be that of event 4.
It is possible to move events past midnight into the following day, when the day number will blink
in the display, see the display diagram in the notes on setting event times.
2
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