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Danfoss 842 Manual

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SETTING SWITCHING TIMES
The mains electricity supply must be ON, the key inserted and turned to
either the Set Programme position (Model 841) or Set Channel 1 position
(Model 842) before carrying out any operations detailed below.
Initially the display will show
E E E E E
indicating that the memory is empty.
Since the timeswitch is capable of automatically carrying out up to 200
switching operations it is recommended that the required programme be
tabulated before setting is commenced, noting that the day number on
display is the current day of the week. A table is provided for this purpose.
In addition, facilities are provided to record the programme(s) entered on
the enclosed card, which can be located adjacent to the unit if required.
It is not essential to key in the programme in sequence since it will
automatically be sorted into chronological order.
To set a programme event:
First press the number key representing the day of the week to be
programmed.
Secondly, key in the time using four numeric keypads in the range 0000
to 2359.
Finally press Enter to enter the required event into the memory.
The unit will not allow the entry of a spurious day or time e.g. day 8 will not
be accepted nor will a time entry of 3600. Depression of an out of range
key will not register on the display; the LCD digit will blink but remain
unchanged until an acceptable number is keyed.
Proceed with the programming of every event using the same entry
sequence.
If an attempt is made to exceed 200 programme events then the display
will show
F F F F F
indicating that the memory is full.
If an incorrect key is pressed then press the Cancel key and re-commence
the sequence.
If a programme event is repeated at the same time on different days then
the keying may be simplifi ed as follows.
Key in the fi rst event using the normal entry sequence. Now simply key in
the new day number and then Enter .
For Model 842 only: Having completed the programme setting for
Channel 1, turn the key to Set Channel 2 and enter the programme required
for this channel in the same manner.
Note: The 200 switching operations are able to be freely spread over
both channels. If a common event time is required on both channels this
represents only one switching operation.
The complete programme may be checked by the use of the
Verify key. Each press of this key will advance the programme by one
event allowing a complete review in chronological sequence commencing
from the day and time on display. If a particular day’s programme is to be
reviewed then key the day number followed by
0 0 0 0 & Verify
when the fi rst programmed event for that day will be displayed then
proceed with repeated presses of the Verify key.
When re-programming one or more events, unwanted events
must be cleared by advancing to the event in question using the
Verify key as explained above and then clearing it by a single press on
the Cancel key.
In the case of Model 842 both the Verify and Cancel functions apply only
to the channel selected by the keyswitch at that time.
To clear the entire programme on both channels, press and hold down the
Cancel key for approx. 3 seconds until the display shows
E E E E E
On completion of programming return the key to Run and the selector
switch(es) to Auto.
BATTERY RESERVE
The unit does not rely on the internal battery in order to work satisfactorily
providing the mains power supply is connected to the unit. The battery is
fi tted purely to memorise the Time of Day and selected Switching Times
in the event of a power failure or disconnection of supply.
When the unit is fi rst connected it will require a minimum of 24 hours to
become suffi ciently charged in order to perform this memory function.
Thereafter the battery is automatically recharged.
If the mains power supply is lost, for any reason, the display on the unit
will go out. The battery will maintain the memory for a period of up to 3
months during this condition. When the power supply is restored, the unit
will automatically switch on again and resume the set programme without
any resetting being necessary.
Danfoss Randall can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss Randall reserves
the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without
subsequent changes being necessary in specifi cations already agreed.
Danfoss Randall Ltd,
Ampthill Road,
Bedford MK42 9ER
Tel: (01234) 364621 Fax: (01234) 219705
Email: danfossrandall@danfoss.com
Website: www.danfoss-randall.co.uk
Part No: 3282 Issue 9 12/05
Example Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Assigned Day No. 1 2 3 4 5 6 7
CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2
Event Time 0845 0845 0845 0845 0845 0845 0845 etc. etc. etc. etc. etc. etc. etc.
0910 0910 0900 0900 0900 0900
0925 0915 0915 1230
1300 1230 1300 1230 1330 1530 1530
1530 1530
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
Assigned Day No.
CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2 CH1 CH2
Event Time
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