SECURE SIR 020/021/022 Countdown Timer Instruction Manual
Learn how to install and use the SIR range of countdown timers with this user manual. SIR 020, SIR 021, and SIR 022 models can control electrical appliances up to 3kW or serve as an override/extension timer for central heating systems. Press the BOOST button to activate and cancel the timer. LEDs indicate the remaining time. Read more here.