Timeguard NTT03 Manuel

Installation & Operating Instructions

7 Day Digital

Time Switch

Model: NTT03

Immersion Timer

Model: NTT04

General Purpose Timer

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.

NTT03 – Immersion Timer

NTT04 – General

Purpose Timer

Power LED Output LED

Bezel

ﬁxing

screws

Advance

button

Boost

button

BezelProgramme

button

Illuminated

screen

Reset

button

Time

button

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

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.

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.

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:

LLive supply

NNeutral 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

(NTT04 only) If volt free is not required,

ﬁt a link between Land Sin.

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.

5. Reset:

The time switch must be reset before programming for

the ﬁrst time, or after subsequent discharge for more

than 5 days, and following a 4 hour period of charging.

Press Rst using a pointed object, eg: a pencil.

The display will show all the

segments, and then clear to show:

Use the Adv/Ovr button to change

between on and off for the automatic

summer time adjustment and

proceed to section 6.

6. Setting the clock:

Press and hold down the Time

button for 3 seconds. The word hold

will show on the screen.

After 3 seconds, the screen will

show a year.

Use the Adv/Ovr or Boost buttons to

change the year to the correct year.

Press Time to set the year, and then the

month will show.

Use the Adv/Ovr or boost button to

adjust the month to the correct month.

Press Time to set the month, and then the day will show.

Use the Adv/Ovr or boost button to

adjust the day to the correct day.

Press Time to set the day, and then

the time will show, hours ﬁrst.

Use the Adv/Ovr or boost button to

adjust the hour to the correct hour.

Press Time to set the hour, and

then the time will show the minutes.

The hour is a 24 hour clock.

Use the Adv/Ovr or boost button

to adjust the minutes to the

correct minutes.

Press Time to exit the Time/date

entry mode.

The display should now show the correct

time/day of the week.

Note: during time/date setting, when the Adv/Ovr

or Boost buttons are held down, the setting under

adjustment will advance or decrease more rapidly.

7. Modifying the date and

time of day:

Normally the only change required

will be to the time of day minutes, in

which case press and hold Time for

3 seconds, during which hold will

show on the display. After 3 seconds

the display will show the year:

Press Time repeatedly until the minutes are shown.

Use Adv/Ovr or Boost to change the minutes to the

correct value. Press Time to return to operating mode.

Other changes can be made the same way, but the

Time button must be pressed to return to operating

mode after any changes. There is no automatic exit

from Time/date entry mode.

8. Programming

ON/OFF times:

The NTT03/04 has 4 independent ON/OFF periods

available for programming each day. There is a choice

of programming options, including 7 days the same

(24 hours), 5 + 2 days (where the weekdays are the

same, and the two weekend days are the same),

and 7 individual days.

Press and hold the Prg button for

3 seconds. Whilst holding, the word

Hold should show on the display.

After 3 seconds, the mode screen

will show.

Use Adv/Ovr or Boost to change the day grouping

mode. This will step through the following options:

24hr – Mo Tu We Th Fr Sa Su

5 day – Mo Tu We Th Fr followed automatically in

programming by 2 day – Sa Su.

Individual day – Mo followed automatically in

programming by each of the other days.

Once the desired day grouping is

selected, press Prg to move onto

programming ON/OFF times.

The display will show Prog 1, with

dashes for the hours and minutes.

Example shown is for 5 + 2 programme.

Use Adv/Ovr or Boost to set the hour for the ﬁrst ON

period. Press Prg to change to setting the minutes.

Use Adv/Ovr or Boost to set the minutes.

Press Prg to change to

programme 1 OFF time.

Press Prg to scroll through

programme 2 ON, programme 2 OFF,

programme 3 ON, programme

3 OFF, programme 4 ON and programme 4 OFF,

adding in times as required.

If times are not required, just leave the dashes in

place, and scroll past that programme.

After programme 4 has been entered, the day will

index to the next day to be programmed, or in the

case of 5 + 2 it will change to Sa Su. Programme the

ON/OFF times as before.

After the last off time for programme 4 has been set,

press Prg to exit programme mode.

At any stage in programming, if the

Prg button is pressed and held for

3 seconds, the timer will return to

operating mode.

The display will now show:

Where the day and time are correct,

but the ON/OFF indicator may not reﬂect the current

programme accurately, in which case press the Adv

button to correct the indicator.

In the same way as for individual programmes, days

or groups of days can be omitted either by leaving

dashes in all the locations for ON/OFF times for

that day or group of days. Alternatively, leaving the

programme entry mode before ﬁlling in all the

ON/OFF times will leave the remaining times blank.

The only way to re-enter a blank time is to reset

the unit.

8.2 Programming

across midnight:

Enter the required programme ON time.

Enter the programme OFF time as 00:00

Enter the ﬁrst programme ON time for the next day

as 00:00

Enter the required programme OFF time.

Note: for 24 hour the ON period for programme 1

must start 00:00.

9. Modifying or

adding programmes:

Press Prg and hold for 3 seconds. Whilst holding,

the word hold will appear on the display.

After 3 seconds the display will show the

programming mode screen. This will be in the mode

in which it was last programmed. For instance if it

was programmed in 5 + 2, then it will show Mo Tu

We Th Fr. Either accept this, press Prg, and review the

times programmed for this mode by pressing Prg,

or press Adv/Ovr or Boost to change the mode, and

then press Prg to review the times. In this case, either

to Sa Su, or to 7 day or to individual days.

Note: If the unit was programmed as a 5 + 2 then

changing the mode to any other mode other than

Sa Su may blank any previous programming.

The same applies for changing from any other mode,

changing from the mode it was last programmed in

may blank the previous programme.

Review times and adjust as necessary as described

in section 8.

10. Advance/Override:

In operating mode Adv/Ovr advances the programme

to the next change. If the output is OFF, it will change

the output to ON, until the next programmed OFF

time. If the output is ON, it will change the output to

OFF, until the next programmed on time.

A second push of the Adv/Ovr button selects a

permanently on mode, where the output is ON,

irrespective of the programming.

A third push of the Adv/Ovr button selects a

permanently OFF mode, where the output is OFF,

irrespective of the programming.

A fourth push of the Adv/Ovr button returns the unit

to operating mode, where the output will conform to

the programming.

11. Boost:

One press of the boost button will provide 1 hours

boost, after which the output will turn OFF. Two

presses will give 2 hours boost. A third press of

the boost button will cancel any boost period.

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