Timeguard NTT08 User Manual

Digital Time

Switch

Model: NTT08

7 Day Immersion Timer

Installation & Operating Instructions

NTT08 – 7 Day
Immersion Timer

Power LED

Output
LED

Illuminated
screen

Advance
button

Programme
button

Reset
button

1

Sliding cover

1. General:

This time switch is an easy to use digital timer,
designed for wall mounting. It can control outputs
of up to 16A which makes it suitable for domestic
immersion heaters.

NTT08 programming can be 7 day, 5 + 2,
or 24 hour.

Boost
button

Time
button

Terminal
cover

2. Features:

4 ON/OFF switching programmes, which can
be made to operate over all 7 days (24 hour
operation), 5 weekdays 2 weekend days, or any
individual day (7 day operation).
Advance feature advances to next
programmed operation.
Boost feature provides 1 or 2 hour boost.
Battery back up retains programmes and clock
times during loss of mains.
Option of automatic summer time update (ASCO).
Shortest switching time of 1 minute.
Programme review.

3. Installation:

2

We recommend that this unit be fitted by a
qualified electrician. Install in accordance
to wiring and current building regulations.
Please read the instructions carefully. If in
any doubt contact the Timeguard Helpline.

Important: Switch off mains electricity
before commencing work.

Remove the terminal cover. Fix the unit to the wall
with the mounting screws provided. Fix the top
screw first and leave 2.5mm proud, place the key
hole in the top of the product over the screw head
and slide down. Then mark and drill the lower
fixing. Secure unit to the wall.

The wiring can enter through the rear knock outs

or the cable entry ports provided. If the wiring is
not through the knock outs, use the cable clamps
provided to secure the cables.

Connect the installation wiring to the terminals
provided, according to the legend on the terminal.

The terminals are marked as follows:

L Live supply.

N Neutral supply.

N Neutral supply to immersion heater.

L1 Switched Live to immersion heater.

E Earth continuity.

Note: this device needs to be left to charge for
a minimum of 15 minutes once powered up,
before it will operate.

3

4. Battery:

The time switch has a factory fitted rechargeable
battery to give clock operation and programme
memory back up during loss of mains supply.

Before programming for the first time, connect the
unit to the mains for at least 15 minutes prior to
pressing the Rst button and programming the unit.

If the display is not visible or very faint, charge for
4 hours prior to pressing Rst and programming.