Timeguard NTT04 User Manual

7 Day Digital

Time Switch

Model: NTT03

Immersion Timer

Model: NTT04

General Purpose Timer

Installation & Operating Instructions

NTT03 – Immersion Timer
NTT04 – General

Purpose Timer

Power LED Output LED

Advance
button

Bezel
fixing
screws

1

button

Reset
button

1. General:

This time switch is a compact and easy to use digital
7 day timer, which fits on a single gang wall box.
It can control outputs of up to 16A which makes it
suitable for domestic immersion heaters.

The NTT04 has volt free contacts, making
it suitable for a wider range of switching
applications. The NTT03 is designed primarily
for domestic immersion heaters.

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

Illuminated
screen

Boost
button

Time
button

BezelProgramme

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:

We recommend that this unit be fitted by a

2

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 two bezel fixing screws, and remove
bezel from timer module and back plate. Separate
the timer module from the back plate, and remove
the wall fixing screws.
Ensuring that the free terminals on the back plate
are at the top, connect the installation wiring to
the terminal block, according to the legend on the
wiring label.
The earth wires should be connected to the wall
box earthing terminal, or should be connected
together using a single way connector block if
there is no suitable earth terminal in the back box.

Fit the wall mounting screws through the back plate
into the wall box threaded holes, and tighten until
the back plate is firmly fastened.

Fit the timer module to the back plate, ensuring
the power output indicator is on the top, and the
locating holes on the timer are set correctly on the
pegs on the back plate. Fit the bezel over the timer
module, and secure to the back plate with the two
screws provided.

For other wiring, the terminals are marked as follows:

L Live supply
N Neutral supply
N OUT Neutral output to immersion heater

(NTT03 only).

SL Switch live output to immersion heater

(NTT03 only).

S in Live Input for volt free output

3

(NTT04 only) If volt free is not required,
fit a link between L and S in.

S OUT Switch live output to heater or other

appliance (NTT04 only).

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

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.