{"product_id":"castair-dual-control-2-duplex-pair-dc2x2","title":"Castair Dual Control 2 Duplex (Pair) - DC2x2","description":"\u003cp\u003eThe Castair DC2x2 is a matched duplex pair of DC2 dual control valves — one for each pump in a duplex compressor system built around two C2 cast iron pumps (7.5–10 HP each). If you're running a duplex setup and both units share a common tank, you need both controls configured to work together in alternating or lead\/lag operation. The DC2x2 gives you that out of the box as a coordinated pair rather than ordering two individual DC2 valves and trying to synchronize them yourself.\u003c\/p\u003e\n\n\u003ch2\u003eWhat a Duplex Compressor Needs From Dual Control\u003c\/h2\u003e\n\u003cp\u003eA duplex compressor runs two complete pump-and-motor assemblies, typically alternating so neither unit carries the full load continuously. In a high-demand shop — production body shop, multi-bay tire shop, industrial finishing line — a duplex configuration provides redundancy (if one unit fails, the other keeps air flowing) and doubles your CFM capacity for sustained heavy demand.\u003c\/p\u003e\n\n\u003cp\u003eStandard start\/stop operation on both units in a duplex still creates the same high-restart-count problem as a single unit: when demand stays at or above 50% of total capacity, the units cycle too frequently. Each restart on a 7.5–10 HP motor pulls 128–168 amps of inrush current. On two motors, that's up to 336 amps of startup draw cycling through your electrical panel multiple times an hour.\u003c\/p\u003e\n\n\u003cp\u003eWith the DC2x2, both units operate in coordinated continuous-run mode during peak demand. When pressure reaches cutout, both pumps unload simultaneously — or staggered, depending on your pressure switch configuration. Each pump runs at approximately half its loaded amp draw during the unloaded phase. Motors stay cooler, pump valves and rings last longer, and your panel sees steady load instead of repeated high-current spikes.\u003c\/p\u003e\n\n\u003ch3\u003eOperating Modes — Same as DC2, Applied to Both Units\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStart\/stop mode (both units):\u003c\/strong\u003e Knobs turned to the right (in) on both controls. Units alternate based on pressure switch sequencing. Suitable for demand below 50% of total system capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuous run mode (both units):\u003c\/strong\u003e Knobs turned to the left (out). Both units unload at cutout, resume at cut-in. Either unit or both run depending on demand level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto-shutoff:\u003c\/strong\u003e Each control shuts its unit off after approximately 2 minutes of no air demand (timer adjustable independently on each control).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy This Matters for Pump and Motor Life\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInrush elimination:\u003c\/strong\u003e At 128–168A per motor at startup, a duplex running 18 starts\/hour per unit is hammering both sets of motor windings. Continuous run mode eliminates this.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal management:\u003c\/strong\u003e Pump temps spike to 263°F at every cold restart vs. a steady 192°F during unloaded continuous operation. Cooler pumps mean longer valve and piston ring life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical demand charges:\u003c\/strong\u003e Many commercial utility rates include a demand charge based on peak amperage draw. Eliminating high-inrush restarts can reduce your demand charge on your electric bill.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatched pair:\u003c\/strong\u003e The DC2x2 ensures both controls are identical and calibrated to the same specifications, which matters for consistent unloading behavior across both pumps.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThe DC2x2 is designed for duplex compressor systems built on two Castair C2 pumps — the two-stage, V4 (four-cylinder) cast iron pumps rated for 7.5–10 HP. The C2 pump weighs 320 pounds, uses a 19.0\" two-groove flywheel, and holds 2 quarts of oil.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor C1-based duplex (4–7.5 HP each):\u003c\/strong\u003e Use DC1x2 (pair of DC1 valves)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor C2-based duplex (7.5–10 HP each):\u003c\/strong\u003e Use DC2x2 (this unit)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor C3-based duplex (10–15 HP each):\u003c\/strong\u003e Use DC3x2 (pair of DC3 valves)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo (2) DC2 dual control valve assemblies — matched pair\u003c\/li\u003e\n\u003cli\u003eMounting hardware for C2 pump unloader ports (both units)\u003c\/li\u003e\n\u003cli\u003eInstallation and adjustment instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Exact valve dimensions, weight, and electrical ratings are not published in Castair's public specifications. Contact us to confirm fitment for your specific duplex configuration.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch2\u003eWhen Does a Shop Need the DC2x2?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBuy the DC2x2 when:\u003c\/strong\u003e You're building or upgrading a duplex compressor system on C2 pumps and your shop operates at sustained high air demand. Body shops running paint booths continuously, tire shops with 4+ bays operating simultaneously, or any facility where the compressor runs at or above 50% capacity for extended periods will see measurable benefit from coordinated dual control.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIf you only need one unit controlled:\u003c\/strong\u003e Order a single DC2 instead. The DC2x2 is specifically for duplex setups where both pumps need to be controlled together.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIf you're building a new duplex system:\u003c\/strong\u003e Factor the DC2x2 into the initial build. Retrofitting dual control after the fact on a duplex is straightforward, but it's easier to get the wiring and pressure switch configuration right from the start.\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecialist since 2016\u003c\/strong\u003e — we stock Castair components and understand duplex compressor configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree tech support at 866-217-0063\u003c\/strong\u003e — we'll help you verify which dual control configuration fits your duplex setup\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e on all Castair parts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest guidance\u003c\/strong\u003e — if you need a DC1x2 or a single DC2 instead, we'll tell you before you order\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342545150165,"sku":"DC2x2","price":656.04,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-dual-control-2-duplex-pair-dc2x2","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}