What are the control signals used in HVAC systems that can interface with relays?

... Dry Contact Relay AC85-250V. Tuya Zigbee 1 Gang Smart Switch with ... Dry Contact Relay AC85-250V. Wireless Remote Switch,Compatible With Remote ... Product Overview. Enclosed Relay 20 Amp SPDT, Class 2 Dry Contact Input, 120 Vac Power Input. General Information. Name : ... Specifications · Brand Model Compatibility. 9900 Panel Mount Transmitter · CE Approved. No · EPA Compliant. No · NSF Certified. No · Product Type. Relay Module. Dec 30, 2018 ... Need zwave dry contact relay control · NuTone NFS20Z Smart Z-Wave Enabled Isolated Fixture Mounted Control, White... · Double Relay Switch - ... Dry contacts have a power source going through them that is independent of the control circuit. It's like a contactor or relay. Switch-on Delayed Timer Relay 12V, 5…30sec adjustable, dry contact. SKU 5002888 Categories Timing Relays, Timing Relays. Old article number N2-1433- ... Aug 5, 2021 ... The alarm tech wants me to achieve this by using a dry contact relay closing, for alarm activated and relay open, when alarm deactivated. I ... The RD8i digital dry-contact relay is the most common control interface for the GCX system offering connection to most equipment found in control ... No current: A dry contact is the synonym of volt free — it is not "wetted" by a voltage source. Dry contact can refer to a secondary set of contacts of a relay ... a dry contact is where a devices output closes a pair of contacts with no connection to any internal circuit or power - eg a PIR sensor can be dry contact with ...