A customer asks if he can interlock his automatic kiln so that it will not fire unless his ventilation system is on. How do you accomplish this?
- The basic concept is that you want to break the common wire that feeds the control and/or power relays of an L&L automatic kiln. (This gets more complicated with a manual kiln with a kiln sitter and this advice does not apply to manual kilns).
- You will find the common wire for the relay coils coming from the "CT" terminal on the DynaTrol.
- Just break that common wire with dry normally open contacts of a control relay. The amperage and voltage is very low (12 volts and a few amps at most).
- Control the coil of your vent control relay with an output from your ventilation system.
- That could be, for instance, a double-throw switch that operates a 120 volt coil or some other more sophisticated output from a sensor or perhaps an airflow switch that allows 120 volts or some other voltage to flow to your control relay.
- The control relay can be mounted in the L&L control panel or can be external to it.