7 Day Digital
Time Switch
Model: NTT03
Immersion Timer
Model: NTT04
General Purpose Timer
I n s tallation & Operating Instructions
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
1
• 230V AC 50 Hz
• Switch Rating: 16A Resistive (3.68kW)
Immersion Heaters
2400W incandescent
and halogen lighting
750W fluorescent
lighting
100W Compact
fluorescent & LED 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.
• Switch Type: 16A relay
• Voltage free contact: NTT04 only
• Contact Type: Normally Open
• Minimum Depth
of Wall Box: 32mm
• Manual Override: Permanent ON or OFF
• 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
programmes per day
• Operating Temperature: 0°C to +40°C
• CE Approved
Note: Not suitable for use with
Discharge Lighting.
Power LED Output LED
2
Advance
button
Illuminated
screen
Boost
button
Time
button
Programme
button
Reset
button
Bezel
4. Installation
• Ensure the mains supply is switched off
and the circuit supply fuses are removed
or the circuit breaker turned off.
• Remove the two bezel fixing screws,
and remove bezel from timer module
and wall plate.
• Ease the module forward without disconnecting,
so you have access to the wall plate
and loosen the screws on the terminal
block for both supply and load cables.
• Ensuring that the free terminals on the wall
plate are at the top, terminate the 230V
50Hz 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 on
the rear side of the wall plate (see section 5.
3
Connection Diagram).
• Fit the wall mounting screws through the
wall plate and into the wall box threaded
holes, and tighten until the wall plate
is firmly fastened.
• Re-position the module back into place
ensuring the time indicator is on the bottom
right hand side, and the locating holes on
the timer are set correctly on the pegs
on the back plate.
• Re-fit the bezel over the timer module,
and secure to the wall plate with the
two fixing screws previously removed.
5. Connection Diagram
Load
• The terminals are marked as follows
on the rear of the wall plate;
NTT03 – 230V Mains Voltage Switching
230V 50Hz
Mains SupplyLoad
SL N
N L
OUT
4
230V 50Hz Mains Supply
Live (Brown or Red) to L
Neutral (Blue or Black) to N
Load
Switch Live (Brown or Red) to SL
Neutral (Blue or Black) to N OUT
Note: this device needs to be left to charge for
a minimum of 15 minutes once powered up,
before it will operate.
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