{"product_id":"red-4-durozone-4-zone-hvac-control-panel-with-fresh-air-and-multi-stage-logic","title":"RED-4 | DuroZone 4-Zone HVAC Control Panel with Fresh Air and Multi-Stage Logic","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"144\" data-end=\"396\"\u003eThe RED-4 is a four-zone HVAC control panel that manages multiple thermostats and dampers in residential or commercial zoning systems. It can coordinate conventional, gas\/electric, or heat pump systems with two-stage cooling and up to three-stage heating. The board supports fresh air integration, multi-stage limits, and emergency heat override for flexible and efficient temperature control.\u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuroZone \/ Duro Dyne\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHVAC Controls\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRED-4 (Model \/ Part # 35234)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZone Control Panel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eZones Supported\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 zones (or 3 zones with 4th as fresh air)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOne-Zone Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes (all dampers follow Zone 1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl System Types\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGas\/electric, hydronic, electric, conventional\/dual fuel heat pumps\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStages (Heat \/ Cool)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUp to 3 heat \/ 2 cool (gas systems); 2 heat \/ 2 cool (heat pumps)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFresh Air Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eZone 4 can be used as fresh air damper (timer controlled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutdoor Temperature Limit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes (ODT limit disables second stage heat)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Air Limit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHeating and cooling supply air limits (potentiometer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEmergency Heat Switch\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOnboard \/ external override support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePurge Option\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFan purge cycle for ~90 seconds post cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDIP Switch Configurable Options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSystem type, thermostat type, purge, capacity limit, ODT, etc.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication \/ Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard 24 VAC thermostat wiring (R, C, G, Y, W, O, etc.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDamper Control Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 VAC open\/close or spring return dampers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Supply Requirement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e24 VAC independent transformer (recommended 40 VA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFuse \/ Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eInternal fuse \/ breaker for damper\/thermostat circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLED Indicators\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHeat, Cool, Fan, Status, SA Limit, ODT Limit, etc.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAutomatic Test Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eContractor test mode for verifying operation of dampers \u0026amp; zones\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e(Not explicitly stated, typical ambient indoor range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHousing \/ Mounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEnclosed control panel for indoor installation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.125 in × 6.5 in × 3.5 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.36 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003eRED-4\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe RED-4 panel is a microprocessor-based control module used in multi-zone HVAC applications to route heating, cooling, and fan commands to zone dampers and the HVAC unit logic. It accommodates conventional or heat pump thermostats (especially on zone 1), supports an optional outdoor temperature sensor to limit multi-stage operation, and includes a DIP-switch configuration scheme to adapt to different system types. Zone 4 can optionally serve as a fresh air damper control rather than a conditioned zone. The control logic includes purge cycles, stage timers, capacity limiting, and emergency heat switching for precise and safe system operation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFour-Zone Control: Coordinates up to 4 independent zones, each with a thermostat and damper, improving comfort and efficiency.\u003c\/li\u003e\n\u003cli\u003eOne-Zone Mode: Allows control of all dampers simultaneously based on Zone 1 thermostat — useful for vacation mode or single zone operation.\u003c\/li\u003e\n\u003cli\u003eFresh Air Damper Function: Zone 4 can be designated as a fresh air intake damper, with an internal timer controlling minutes-per-hour fresh air.\u003c\/li\u003e\n\u003cli\u003eOutdoor Temp Limit (ODT): Disables second-stage heating when outdoor temperature is higher than a configurable ODT Limit, saving energy.\u003c\/li\u003e\n\u003cli\u003eStage Control Logic: Supports 3-stage heating \/ 2-stage cooling for gas\/electric systems; supports 2-stage heat + 2-stage cool for heat pumps.\u003c\/li\u003e\n\u003cli\u003eEmergency Heat Override: Built-in external emergency heat switch lets emergency heating be commanded regardless of thermostat type.\u003c\/li\u003e\n\u003cli\u003eSupply Air Temp Limits: Includes heating and cooling limit potentiometers: if supply air exceeds (or drops below) these limits, system staging is inhibited or turned off.\u003c\/li\u003e\n\u003cli\u003eAutomatic Purge Cycle: At end of heating or cooling calls, fan runs for set time to purge residual air from ductwork.\u003c\/li\u003e\n\u003cli\u003eConfigurable via DIP Switches: Panel is configurable for system type (gas\/electric, heat pump, dual fuel), thermostat type, purge, capacity limiting, etc.\u003c\/li\u003e\n\u003cli\u003eBuilt-in Protection \u0026amp; Diagnostics: Includes internal circuit protection (breaker\/fuse), LED status indicators (Heat, Cool, Fan, ODT, SA Limit, etc.), and an Automatic Contractor Test mode to validate damper and thermostat operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe RED-4 delivers the flexibility, control logic, and safety features required for robust HVAC zoning systems.\u003c\/p\u003e","brand":"Durozone","offers":[{"title":"Default Title","offer_id":49105137729792,"sku":"RED-4","price":568.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0388\/5331\/2557\/files\/Duro_Dyne_35234.jpg?v=1785541069","url":"https:\/\/alotechparts.com\/products\/red-4-durozone-4-zone-hvac-control-panel-with-fresh-air-and-multi-stage-logic","provider":"Alo Tech Solutions","version":"1.0","type":"link"}