Adjustable Pneumatic
Time Delay Switch
Model: DS4
Installation & Operating Instructions
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1. General Information
These instructions should be read carefully and retained for further reference
and maintenance.
2. Safet y
• Before installation or maintenance, ensure the mains supply to the
Delay 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 Delay Switch and install in accordance with the current
IEE wiring and Building Regulations.
• Check that the total load on the circuit including when this Delay Switch is
fitted does not exceed the rating of the circuit cable, fuse or circuit breaker.
3. Technical Specifications
• 230V AC 50 Hz
• Switch Rating: 6A Incandescent and resistive loads
3A Fluorescent and inductive loads
80W LED lighting
• Adjustable Time Delay: 10 seconds to 10 minutes (Approximately)
• Switch Type: Single Pole Change-Over Contact
• Minimum Depth of Wall Box: 20mm
• CE Compliant
• EC Directives: Conforms to latest directives
• Dimensions (H x W x D): 82 x 82 x 40mm
Note: Not suitable for use with Discharge lighting
The LED switching capabilities of this product can be increased
up to 200W by the addition of the Timeguard ZV900 Automatic
switch load controller – sold separately
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4. Installation
This time delay switch can be used on its own, or with other units in a 2-wire
(no neutral) lighting circuit, and therefore can be installed on new installations
or to replace existing single gang switches.
• Ensure that the mains supply to the circuit breaker is switched off and
the circuit supply fuses are removed or the circuit breaker turned OFF.
• It is recommended that if using moulded backing boxes, please ensure that
the box only has two mounting lugs as certain manufacturers do not allow
adequate clearance for the Time Delay Switch terminal connections.
• Some moulded boxes also have two locating pips on the mounting face which
can obstruct the Time Delay Switch and prevent it from fitting flush. This will
need to be ground off.
• If mounting on surfaces such as unplastered brickwork or the mounting box is
completely true to the wall surface, please avoid over-tightening the mounting
screws, as this may cause the switch faceplate to distort and in turn lock the
plunger in the ‘ON’ position.
• Terminate the 230V 50Hz supply and load cables into the back of the time
delay switch ensuring correct polarity is observed and that all bare conductors
are sleeved (See section 5. Connection Diagram).
• Once you have adjusted the Time ON delay (see section 6. Timing Adjustment)
secure the delay switch to the back box using the two fixing screws supplied,
ensuring not to overtighten them.
IMPORTANT: All metal back boxes must be earthed. Please ensure
that the top and bottom lugs are removed, if fitted, from the metal
wall boxes before fitting as there is a danger of the common terminal
(marked COM) fouling a mounting lug and causing an earth fault if
boxes having four lugs are used.
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