Looking for a circuit that can control a contactor. It needs to be adjustable on off time.
The circuit will be controling a blowdown valve on a small boiler. When the boiler is running i need to open a 120vac valve for several minutes every hour. If the boiler shuts off i need to be able to disable this timer in the off position until the boiler starts back up. It starts and stops automatically. Usally once or twice a week. 120 vac is available as well as contacts to signal when running ad not running. Any ideas would be great. Off the shelf components would also help.