1
Seven Day Two Channel Electronic 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.
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.
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
PART NO: 8/3223 Double Gang Surface Box Adaptor
CABLE
ENTRY
APERTURE
2 fixings for
double gang
surface box
Alternative 4 fixings
for double gang
surface box
4 fixings
for MK8
timeswitch
PART NO: 8/3222 Square Conduit Box Adaptor
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.
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.
CABLE
ENTRY
APERTURE
4 fixings for existing
square conduit box
4 fixings for
MK8 timeswitch
