Timeguard NTT08 Manual

Installation & Operating Instructions

7 Day Digital

Time Switch

Model: NTT08

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1. General Information

These instructions should be read carefully

and retained for further reference

and maintenance.

2. Safety

• Before installation or maintenance,

ensure the mains supply to the time switch is

switched off and the circuit supply fuses are

removed or the circuit breaker turned off.

• It is recommended that a qualified electrician

is consulted or used for the installation of this

time switch and install in accordance with the

current IEE wiring and Building Regulations.

• Check that the total load on the circuit

including when this time switch is fitted

does not exceed the rating of the circuit cable,

fuse or circuit breaker.

3. Technical Specifications

• 230V AC 50 Hz

• This time switch is of class I construction

and must be earthed

• Switch Rating: 16A Resistive (3.68kW)

Immersion Heaters

• Switch Type: 16A relay

• Voltage free contact if wire link is removed

• Contact Type: Normally Open

• Manual Override: Permanent ON or OFF

• Boost Times: 1 or 2 hour

• Power Status

LED Indicator: Red

• Output LED

Indicator: Green

• 7 Day Time Period (7 Day, 5 + 2 Days

or Individual Day) – 4 ON/OFF switching

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2Programme

button

Illuminated

screen

Reset

button

Time

button

Power LED

Terminal

cover

Sliding cover

Output

LED

Boost

button

Advance

button

• Operating Temperature: 0°C to +40°C

• CE Approved

Note: Not suitable for use with

Discharge Lighting.

The LED switching capabilities of this product

can be increased to 200W by the addition of

the Timeguard ZV900 Automatic switch load

controller – sold separately.

4. Installation

• Ensure the mains supply is switched off

and the circuit supply fuses are removed

or the circuit breaker turned off.

• Remove the terminal cover by undoing

the fixing screw on the bottom of the

time switch.

• Mark the position of the top wall mounting

screw. Drill out the top mounting hole taking

care to avoid any joists, electrical cables

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Illuminated

screen

or water/gas pipes that may be hidden

beneath the surface. Insert the rawl plug

into the hole.

• Fix the top mounting screw and leave

2.5mm proud off of the wall.

• Place the key hole in the top of the product,

over the screw head, and slide down.

• Mark the position of the lower mounting

hole on the wall using the wall plate

as a template.

• Remove the product and drill out the lower

mounting hole again taking care to avoid

any joists, electrical cables or water/gas pipes

that may be hidden beneath the surface.

Insert the rawl plug into the hole.

• The 230V 50Hz supply and load cables can

enter through the rear knock outs or the front

cable entry ports provided. If the rear knock

outs are being used, remove the blanking

plates and pass the supply and load cables

through the holes.

• Place the key hole in the top of the

product again, over the screw head,

and slide down.

• Secure the unit to the wall using the lower

mounting screw.

• If the wiring is through the front cable entry

ports, use the cable clamps provided to

secure the supply and load cables.

• Terminate the supply and load cables to

the terminal block ensuring correct polarity

is observed and that all bare conductors

are sleeved. Please note the connections are

marked beneath the terminal block

(see section 5. Connection Diagram).

• Secure the terminal cover back into place

using the fixing screw.

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5. Connection Diagram

• The terminals are marked as follows

on the bottom of the wall plate;

Wiring as marked on the terminals –

Left to right

Live Supply (Brown or Red) to L

Neutral Supply (Blue or Black) to N

Neutral Load to immersion heater

(Blue or Black) to N

Switch Live to immersion heater

(Red or Brown) to L1

Earth (Green/Yellow) to

Note: this device needs to be left to charge for

a minimum of 15 minutes once powered up,

before it will operate.

LNNL1E

Load

230V 50Hz

Mains Supply

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6. 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.

• Approximately 720 hour battery reserve.

7. 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 the Rst button once using a pointed

object e.g. a pencil or a paper clip.

• The display will show all

characters/digits and then will

clear to show the following;

ASCO = Automatic Summer/

Winter Change Over.

• Use the Adv/Ovr button to change between

ON and OFF for the automatic summer time

adjustment and proceed to section 9.

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8. Setting the clock

• Press and hold the Time button for 3 seconds,

the word Hold will show on the screen.

• After 3 seconds release the

Time button and the screen

will show the year;

• Use the Adv/Ovr to increase

(or the Boost buttons to

decrease) the value and set

to the correct year.

• Press the Time button once to

save the year, and the screen

with show the month;

• Use the Adv/Ovr or

boost button to set

the correct month.

• Press the Time button once

to save the month, and the

screen will show the day;

• Press the Time button once

to save the day, and the

screen will show the time –

hour first;

Note: The hour is in

24 hour format.

• Use the Adv/Ovr or boost button to adjust

to the correct hour.

• Press the Time button once to save the hour,

and the minutes can be adjusted.

• Use the Adv/Ovr or boost button to adjust

to the correct minutes.

• Press the Time button once to exit

the Time/date entry mode.

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• The display should now

show the correct time/day

of the week, for example;

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 the Time button for

3 seconds, the word Hold will show

on the screen.

• After 3 seconds release the

Time button and the screen

will show the year;

• Press the Time button repeatedly until

the minutes are shown.

• Use Adv/Ovr or Boost to change the minutes

to the correct value.

• Press the Time button once to return

to operating mode.

Note: 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.

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• Use the Adv/Ovr or Boost to change the day

grouping mode. This will step through the

following options;

24hour – 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

of the week)

• Once the desired day grouping is selected,

press Prg button once to set and move onto

programming the ON/OFF times.

• The display will show

Prog 1, with dashes for

the hours and minutes;

Note: the example shown

is for 5 day + 2 day

programming.

9. Programming

ON/OFF times

The NTT08 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,

the word Hold will show on the screen.

• After 3 seconds release the

Prg button and the MODE

screen will be displayed;

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• Use Adv/Ovr or Boost button to set the hour

for the first ON period.

• Press the Prg button once to set and move

you to the minutes.

• Use Adv/Ovr or Boost button to set the

minutes for the first ON period.

• Press the Prg button once to set and move

you to the Programme 1 OFF time.

• Use Adv/Ovr or Boost button to set the hour

for the first OFF period.

• Press the Prg button once to set and move

you to the minutes.

• Use Adv/Ovr or Boost button to set the

minutes for the first OFF period.

• Press the Prg button 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.

Note: If further times are not required, just

leave the dashes in place and scroll past the

rest of the programs using the Prg button.

• After Programme 4 has been entered, then

next day grouping will follow e.g. In this

example the day grouping will change

to 2 day – Sa Su Programme 1 ON.

• Programme the ON/OFF times as before.

• After the last OFF time for programme 4 has

been set, press the Prg button once to exit

the programme mode.

Note: At any stage in programming, if the

Prg button is pressed and held for 3 seconds,

the timer will return to normal operating mode.

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