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The Ei103R is a low voltage heat alarm from Ei complete with relay contacts and test button. The heat alarm can be interconnected with up to 12 units.
The manufacturer's recommendation is to test the alarm by pressing the test button. This will simulate a heat input at the heat sensor. You can also test it with a hair dryer but make sure that the hairdryer is kept away at a suitable distance from the alarm. Do not attempt to test the alarm by using open fire or excessive heat as this may damage the unit.