First of all, we must know that this is a combined heat detector smoke alarm. It has both the function of detecting smoke and the function of sensing temperature changes, so to test it, you need to test it separately. Of course you can watch the following video to see how heat detector smoke alarm works.
Step one （test heat detector）
The heat detector smoke alarm can be tested by applying a gentle heat source such as a hair dryer or other device specifically designed for testing heat sensitive detectors.A hair dryer held 6-8 inches from the detector will cause it to operate on its rate-of-rise within 8-12 seconds.
step two （test smoke alarm）
one way：you can test your heat detector smoke alarm by pushing the Test/Hush button（ find the test button on the front or side of the unit） on the cover and holding it down for a minimum of 5 seconds to ensure the alarm sounds
And the other way：
Tools: One lighter and one cigarette.
Method: Turn on the smoke detector for about one minute, wait for the smoke detector to detect the surrounding environment, light the cigarette and take a big sip, spray it out against the smoke, then the smoke will detect the change of the surrounding smoke. And send an alarm message.
The above is the test method of combined heat detector smoke alarms, I hope to help you. Finally, I wish you a happy life.