Issue 1.0 2
Product Overview
The SST So Start Timer is a fully weatherproof (IP65-rated) soluon for controlling electric heaters (such as quartz
halogen). It provides med heat on demand, yielding energy savings by switching o automacally when unaended,
whilst prolonging the life of the heater using so-start and so-stop technology.
The SST4-PB is operated using a built-in pushbuon, featuring an LED indicator for night visibility and status. When
triggered, power is gradually applied to the heater over 3 seconds, reducing stress to the element and electrical
supply. Aer an adjustable me period has elapsed, the heater is turned o in a similar manner.
The SST4-PB-T adds the addional funconality of an integrated temperature sensor. When the outside
temperature is sensed to be above the temperature selected, the pushbuon is disabled which prevents heaters
from being used during warmer periods.
Product Wiring
1. A suitable means to isolate the electrical supply to the unit must be provided.
2. The power terminals are suitable for use with up to 4mm² conductors. Use round cable of an appropriate rang
for the loads to be connected, nong that the SUPPLY terminals carry the total load current, as well as powering
the control circuitry. Ensure all connecons are ght, and free of stray strands.
3. The cable glands are suitable for outer diameters of 7 to 13mm. If more than one load cable is to be connected,
use an appropriate juncon box. Do not pass more than one cable through one gland.
4. When reghtening the gland nuts onto the cable, ensure that the rubber sealing ring is correctly in place and that
the gland rmly grips the outer sheath.
Installaon
1. Loosen the four screws to remove the front cover.
2. Mount the unit securely to a vercal surface (away from direct radiaon from the heater, and preferably also from
direct sunlight) using appropriate hardware with the four mounng holes indicated in Figure 1. IMPORTANT: The
cable glands must face downwards.
3. Make connecons as detailed in Figure 1 and the Product Wiring secon.
4. Adjust the internal controls to suit the operaonal requirements (see Setup below).
5. Before replacing the cover, securely connect its ying lead to the Front Panel connector.
6. Reaach the cover securely, alternang between screws in opposite corners to create an even seal.
Setup
1. If the front cover is installed: Remove the four screws, li the cover slightly, and carefully pull to disconnect the
ying lead from the Front Panel connector on the circuit board.
2. Adjust the Delay dial to set the period aer which the load will automacally switch o, e.g. 30 minutes.
3. SST4-PB-T only: Adjust the Temp Limit dial to the temperature above which the pushbuon will be disabled.
4. Follow steps 5 and 6 under Installaon above, to replace the cover.
Operaon
1. In standby mode, the LED will glow dimly to enable the pushbuon to be located in the dark.
2. SST4-PB-T only: The LED will glow only when the pushbuon is enabled (when the outside temperature is below
the temperature selected on the Temp Limit dial).
3. To acvate the unit, press the buon briey. The LED will ash rapidly as the load is gradually powered up over 3
seconds, and then light solidly when the so start is complete.
4. SST4-PB-T only: The unit cannot be acvated if the outside temperature is above the selected temperature.
5. One minute before the me delay is due to expire, the LED will begin to ash slowly. The unit may be
retriggered at any me (reseng the me delay) with a brief press of the buon.
6. When the me delay expires, or if the buon is held down for 3 seconds, the unit will gradually turn o the heater
over 3 seconds (during which the LED ashes rapidly), and then return to the standby state.
