Installation/Operating
Instructions for Central Heating Programmers
Models: T612A-C & T634A-C
Securing screws
Securing screws
Wiring terminals
T634A-C
Central Heating Programmer
7 Day Electronic - 1-4 Channe
l
(Diagram shown)
T612A-C
Central Heating Programmer
7 Day Electronic - 1-2 Channel
The T612A-C (2 Channel)/ T634A-C (4 Channel) programmers are seven day
timers in a slim, elegant enclosure. Each of the two or four channels offers up to
forty programmed operating periods per channel, with a boost and advance
available on each.
Per Channel -
4 ON & 4 OFF settings for everyday of the week.
4 ON & 4 OFF settings for each day block:
Mon - Fri
Mon- Sun
Sat & Sun
This unit should be installed by a competent person in accordance with
the current IET Wiring Regulations. If in doubt consult a qualified electrician.
Warning
: Isolate Mains Supply before commencing installation.
INSTALLATION INSTRUCTIONS
Fitting the mounting plate
L N CH
1
CH
2
CH
3
CH
4
The mounting plate should be carefully removed from the timer by loosening
the two securing screws on the top of the timer and swinging out the mounting
plate away from the body of the timer. The mounting plate should be fitted with
the wiring terminals located at the bottom and in a position which allows the re-
quired clearances around the mounting plate to allow re-fitting of the timer
body.
WIRING BOX MOUNTING
The mounting plate may be fitted directly on to a single gang steel flush wiring
box complying with BS4662, using two 3.5mm screws. The T634A-C/T612A-C
programmer is suitable for mounting on a flat surface only; it must not be lo-
cated on a surface mounted box or on unearthed metal surfaces.
Mains Supply
T612A-C
T634A-C
Mains Supply
ELECTRICAL CONNECTIONS
All necessary electrical connections should now be made. Flush wiring can
enter from the rear through the aperture in the mounting plate. The mains
supply terminals are intended to be connected to the supply by means of fixed
wiring.
The recommended cable sizes are 1.0mm
2
or 2.5mm
2
.
The T634A-C/T612A-C programmer is double insulated and does not require an
earth connection. Ensure that no conductors are left protruding outside the
central space encompassed by the mounting plate, and there are no strands
of loose conductors protruding from the terminals.
INTERNAL WIRING DIAGRAM FOR T634A-C and T612A-C
An example circuit diagram is shown above. This diagram is schematic and
should be used as a guide only.
Please ensure that all installations comply with
the current IET regulations.
FITTING THE PROGRAMMER
Make sure the two securing screws on the top of the mounting plate are loose.
Locate the two lugs on the lower edge of the mounting plate into the two
corresponding apertures on the timer. Swing the top of the timer into position,
ensuring that the connection pins on the rear of the unit locate into the
terminal slots on the mounting plate. Tighten the two securing screws.
OPERATING INSTRUCTIONS
This is a four/or two channel programmable timer. It is used for controlling
home appliances such as heaters, lighting systems etc. This timer has 1-2 or 1-4
individual channels. Each channel works in automatic or manual operating
mode
.
