Time Guard FST24, FST77 Installation & Operating Instructions Manual

Installation & Operating Instructions

Fused Spur

Time Switch

Model No. FST24 – 24 Hour Timer

Model No. FST77 – 7 Day Timer

1

2

Power LED

Sets time
and date

Reset button

Illuminated screen

Output LED

Sets
programmes

Double pole
switch

BS 1362 (1"x

1

/4") fuse

Boosts for 1 or

2 hours and

decrements

displayed value

during time and

programme

setting

Override until

next programme

change and

increments

displayed value

during time and

programme

setting

1. General Information

Contents:

1x FST programmer
Bag containing: 2x 3.5mm screws, 2x cable clamp set.
1x Instruction leaflet

The FST24 (24 hour) and FST77 (7 day) are units which mount onto a BS4662
flush mount single box, or a BS5733 surface mount single box, (25mm deep in
either case). There is provision for a single front exit output cable, with built in
cable clamp.

The unit combines the facilities of a time switch and a double pole switched fused
connection unit capable of being wired directly into a ring main. The contacts are
not volt free. There is a loop terminal for earth continuity. The unit has the option
of automatic daylight saving pre-programmed in.

Fig. 1
FST24/FST77 Front Panel

2

3

2. Battery

The unit has an in built non replaceable, rechargeable battery, which will keep the
programmed times during power down situations for up to 4 weeks. If the screen
goes blank, once power is restored, and 4 hours have elapsed (to give a working
battery charge), Reset must be pressed, and times/programmes re-entered.

Before programming for the first time, connect the unit to the mains for at least
15 minutes prior to pressing the Reset button and programming the unit.
If the display is not visible or very faint, charge for 4 hours prior to pressing
Reset and programming.

Supply live
terminal

Switched

neutral terminal

(load neutral

connection)

Loop terminal

for earth

continuity

Supply neutral

terminal

Switched live
terminal (load
live connection)

3. Applications

Energy consuming appliances such as immersion heaters and storage heaters
up to 13A total loading can be supplied by the FST24/77 enabling users to
make use of economy 7.

If the user has other appliances which do not have push button start, such as
washing machines, dishwashers and tumble dryers, these may also be controlled in
the same way. It can also be sued to control lighting, if a neutral is made available.
Lighting loads can be found in the specification section of this leaflet.

Fig. 2
FST24/FST77 Rear Connections

3

4

4. Features

5. Installation

4 On/OFF switching programmes per day. Which for the FST77 can be made to
operate over all 7 days (24 hour operation), 5 weekdays 2 weekend days, or any
individual day (7 day operation). For FST24, 5+2 and individual day programming
are not available, all 7 days are the same.

Advance feature, which can advance to next programmed operation, turn output
permanently on, turn output permanently off, or return to programmed times.

Boost feature provides 1 or 2 hour boost.

Option of automatic summer time update (ASCO).

Shortest switching time of 1 minute.

Programme review.

Important: Switch off mains electricity before commencing work.

The unit is designed to replace an existing single gang connection unit
or fixed appliance outlet giving timed mains output, protected by a BS1362 fuse.
The unit is capable of forming part of a ring main (the terminals can accept
2 x 2.5mm sq. cables) or terminating a spur off the ring main. The unit requires
a minimum depth of 25mm within the box.

Ensure that the wiring is adequate for the load to be carried. Connect incoming and
outgoing cables to the relevant terminals. Secure the unit to the back box with the

3.5mm screws provided, forming cables during installation to avoid entrapment
and cable damage.

Use the loop terminal, or the earth terminal in the back box for earth continuity
if required. If installed into a metal back box, earthing of the back box is required.

There is a removable cable blank to cover the front cable exit if this feature is not
required. If the front cable exit is required, for instance to connect to a washing
machine, use one of the cable clamps provided to secure the outgoing cable.