The ZoneFirst 4PDR Relay is a specialized 24Vac 4PDT relay engineered for multi-purpose HVACR control and complex zoning logic. This unit features a 4 Pole Double Throw configuration, allowing a single 24V signal to switch four independent sets of contacts. It is most commonly deployed as a slave damper control relay, enabling a technician to drive up to four separate dampers from one zone on a control panel or a single switch. The 4PDR utilizes a plug-in relay design paired with a heavy-duty screw terminal base, which facilitates rapid field replacement using the PIRR replacement relay module without requiring a full rewire. The base is designed for versatile mounting, supporting either DIN rail or flush mount applications. With dedicated common, normally open, and normally closed terminals clearly marked, this 24V HVAC control relay provides the reliability needed for heavy-duty switching in commercial or residential automation environments. Key Benefits Multi-Damper Synchronization: Primary solution as a slave damper control relay for managing up to four dampers simultaneously from a single 24V source. Interchangeable Relay Module: Optimized for uptime, the plug-in PIRR model can be swapped into the screw terminal base quickly if a coil or contact failure occurs. Industrial Mounting Options: Integrated plastic base supports DIN rail mounting or standard flush-mount surface installation for clean panel builds. 4PDT Switching Flexibility: Provides 4 Pole Double Throw action (four SPDT circuits) to isolate or bridge multiple low-voltage control circuits. Standardized HVAC Voltage: Specifically designed for 24Vac circuits, making it compatible with the majority of HVAC control panels and zoning systems. Common Questions How is the ZoneFirst 4PDR wired for damper control? The relay coil is powered via terminals 13 and 14. The bottom row of terminals acts as the common for each switch, while the top row contains normally closed (1-4) and normally open (5-8) contacts for the controlled dampers. Can the plug-in relay be replaced without replacing the base? Yes, the internal 4PDT relay component is a PIRR replacement relay that can be pulled from the screw terminal base for instant field servicing. What is the primary application for a 4PDT relay in zoning? It is typically used to expand the capacity of a zone panel when the current draw of multiple dampers exceeds the panel's direct output rating or when specific logic isolation is required across four separate circuits. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
