Hi bobver,
Based on the type of appliance needed to turn on, the appliance module will do the trick for you.
AM486- 2 pin appliance module
AM466-3 pin appliance module.
Once you have your choice and its plugged in, set the H/C & U/C to the same as the DS7000 and that should do the trick for you. When the alarm it triggered as with the extra sirens it will respond to the All light On, All lights OFF command that the console send out when triggered. Yes for about 4 mins or so is the length of time the siren sounds off and then it will resume itself back to arm, or Off on all units.
If a the module doesn't respond at first or some of the time, try plugging the appliance module in another outlet, one on the same phase or circuit at least.
Hope that help.