Danfoss 852 User Instructions

Seven Day Two Channel Electronic Timeswitch
Model 852
User Instructions
DESCRIPTION
The Day and Time are displayed as fi ve digits on the liquid crystal display
(LCD).
The fi rst digit in its separate window marked Day will be a numerical from
1 to 7 which may be allocated in sequence to the days of the week at the
user's discretion. The normal convention is Monday = 1, Tuesday = 2 .........
Sunday = 7.
The remaining four digits in the window marked Time will display the time
to a resolution of one minute from 0000 to 2359.
A short 'bleep' will be heard when a keypad is pressed. In addition when
a numeric keypad is pressed the associated digit on the LCD will either
blink or change.
There are ten red indicator lights. Eight (4 per channel) are associated with
the keypads 'Enter On', 'Enter Off', 'Extend' and 'Crop', and two (1 per
channel) labelled 'Output'.
The 2 position selector switches may be set to Off to override the
programmes or it may be set to Auto to follow the programme which has
been set. On the respective channels the programme indicator lights will
switch on and off to follow the set programme events in both the selector
switch positions but the output status indicator lights will only be on if the
selector switch is at Auto and either the 'Enter On' or 'Extend' indicator
lights are on.
If the Enter On and Crop indicator lights for any one channel are on the
output status indicator light for that channel will be off.
It is recommended that the key be removed from the keyswitch to prevent
unauthorised or accidental changes to the settings. The key can only be
removed when in Run position.
TIME OF DAY
The mains electricity supply must be ON, the key inserted and turned to
Set Time position before carrying out the operations detailed below.
When the timeswitch is fi rst connected, or when the battery has been
allowed to discharge fully, and the mains electricity supply is switched ON
a dash (-) will be displayed in each of the fi ve digit positions.
Decide which day of the week you wish to assign as Day 1.
Press the number key representing the current day of the week (listen for
the 'bleep').
The remaining days will be automatically numbered in sequence.
Key in the time using four keypads e.g. 8:30 a.m. must be keyed as
0 8
and 6:15 p.m. as
1 8
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.
DO NOT PRESS ANY FUNCTION KEYPADS.
Returning the key to the Run position will enter the time shown on the
display.
SETTING SWITCHING TIMES
The mains electricity supply must be ON, the key inserted and turned to set
'Channel 1' position before carrying out any of the following operations.
3 0
1 5
CAUTION: The unit operates at mains voltage and should only be opened by a
qualifi ed engineer after disconnection from the mains supply.
Day of Week Display
Time of Day Display
Day Time
7 1346
7 8
9
Extend
4 5 6
Enter
On
1 2 3
Verify 0
Cancel
Extend
10 8 Function
Numeric Keypads
Keypads
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.
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 On' or 'Enter Off' 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 recommence
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 On' or 'Enter Off' as required.
Programme Indica-
tor Lights
Output Status
Indicator Light
852
2 Position
Auto Off Selector
Crop
Set
Switch
Channel 1
Channel 1
O
u
Set
Enter
t Run
Off
p Time
u
t
Channel 2 Set
Channel 2
Crop
Auto Off
4 Position
Keyswitch
1