Danfoss 852 Installation guide
Seven Day Two Channel Electronic Timeswitch
N
L
1
2
3
4
5
6
Links for 230V
control
circuit(s)
230V 50Hz
Mains Supply
Channel 2
OFF
ON
Channel 1
OFF
ON
MK8-852 (3016 12/01)
N
L
6
CABLE
ENTRY
APERTURE
2 fixings for
double gang
surface box
Alternative 4 fixings
for double gang
surface box
4 fixings
for MK8
timeswitch
Model 852
Installation and Wiring Instructions
The model 852 timeswitch must be installed by a competent
electrician and the installation should conform to IEE Wiring
Regulations.
Installation and Wiring
1 Slacken the four fi xing screws, one in each corner
of the unit, and carefully separate the front and rear
portions. Unplug the ribbon cable from the rear portion.
CAUTION: Do not allow either half of the unit to hang
by the ribbon cable as damage could be caused.
2 Remove the polystyrene packing piece from the top
of the transformer. It is marked “REMOVE”.
3 Select the desired fi xing position and observe the label
“THIS WAY UP” inside the rear portion. The two halves
will only assemble correctly one way round.
4 Four fi xing holes are provided for attaching the rear
portion to the wall or mounting surface.Conduit box
adaptors as shown below are availabe if required.
PART NO: 8/3222 Square Conduit Box Adaptor
CABLE
ENTRY
APERTURE
4 fixings for existing
square conduit box
PART NO: 8/3223 Double Gang Surface Box Adaptor
4 fixings for
MK8 timeswitch
6 For surface cable entry remove the appropriate
knockout and ensure one of the cable clamps is
positioned correctly.
7 Connections to the unit should be made as shown
below:
If the control circuits are to operate at 240V then
terminals L, 1 and 4 must be linked, ensuring that the
cable is sheathed and of a size to carry the required
load current.
If the control circuits are operating at voltages other
than 230V then terminals 1 and 4 should be connected
to the required power supply and not to terminal L.
5 Surface cable entries to the unit can be made from
above, below or from the lefthand side. Conduit or
recessed cable entry is through the aperture in the
rear moulding.
8. Upon completion of wiring, plug in the ribbon cable
ensuring the polarised plug is fully inserted into the
socket. Refi t the front half of the timeswich ensuring
correct alignment and that no cables are trapped before
re-tightening the screws.
1
SPECIFICATION
Power Supply : 230Vac, 50Hz
Switch Action : 2 x SPDT, type 1 B
Switch Rating : 10 to 253Vac, 50/60Hz, min 10mA, max 10 (4) A
Timing Accuracy : ±1 min/month
Power Reserve : 3 months on fully charged battery
Max. number of switching operations : up to 200 ON or OFF operations per week
Enclosure Rating : IP30
Max. Ambient Temperature : 45°C
Designed to meet : BS EN60730-2-7
Overall Dimensions (mm) : 228 wide x 115 high x 50 deep
Control Pollution Situation : Degree 2
Ball Pressure Test : 75°C
Rated Impulse Voltage : 2.5kV
Alternative position for
cable clamp
Polarised Plug
Aperture for
cable entry
4 fi xing
holes
2 cable clamps
THIS WAY UP
3 knock outs for
surface cable entry
N
L
6
5
4
3
2
1
Terminal Block
Rating & Model
label
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 Ltd
Ampthill Road,
Bedford MK42 9ER
Tel: (01234) 364621 Fax: (01234) 219705
Email: ukheating@danfoss.com
Website: www.heating.danfoss.co.uk
2
Part No: 3078 Issue 8 12/05
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