{"product_id":"coleman-mach-control-box-9530a751-heat-pump","title":"Coleman | Mach Control Box | 9530A751 | Heat Pump","description":"\u003cp\u003eAdd heat pump and heat strip control to your Coleman Mach RV system with the \u003cstrong\u003eColeman Mach 9530A751 Heat-Ready Heat Pump Control Box\u003c\/strong\u003e. This 12V DC control box is engineered specifically for Coleman Mach HP2 Heat Pumps and Mach 8 air conditioners with heat strip — operating compressor, high fan, low fan, and heat relays via low-voltage thermostat control to deliver both cooling and heat pump heating from a single wall thermostat.\u003c\/p\u003e\n\n\u003ch3\u003eWired for Full Heat Pump Function\u003c\/h3\u003e\n\u003cp\u003eUnlike basic cool-only control boxes, the 9530A751 is wired for \u003cstrong\u003efull heat pump operation\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompressor relay\u003c\/strong\u003e — drives the heat pump compressor for both cooling and heating modes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh fan relay\u003c\/strong\u003e — high-speed airflow operation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow fan relay\u003c\/strong\u003e — low-speed airflow operation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeat relay\u003c\/strong\u003e — controls heat strip when installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe result: full year-round climate control through a single wall thermostat — cooling in summer, heat pump heating in moderate cold weather, and electric heat strip backup when temperatures drop below heat pump efficiency thresholds.\u003c\/p\u003e\n\n\u003ch3\u003eElectric Heat Strip Ready\u003c\/h3\u003e\n\u003cp\u003eThe 9530A751 supports an optional \u003cstrong\u003eelectric backup heat strip\u003c\/strong\u003e (sold separately) for supplemental heating when heat pump efficiency drops in colder temperatures. Compatible heat strip part numbers:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColeman Mach 4700 Series:\u003c\/strong\u003e Heat strip #47233-4551 (sold separately)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColeman Mach 48000 \/ 49000 Series:\u003c\/strong\u003e Heat strip #9233-4551 (sold separately)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⚠️ Compatibility — HP2 Heat Pumps and Mach 8 Only\u003c\/h3\u003e\n\u003cp\u003eThis control box is engineered specifically for:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eColeman Mach HP2 Heat Pumps\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eColeman Mach 8 air conditioners with heat strip\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is \u003cstrong\u003eNOT compatible\u003c\/strong\u003e with cool-only AC units or non-Coleman Mach brands. Verify your AC type before ordering — using the wrong control box for your AC type will result in incompatible operation.\u003c\/p\u003e\n\n\u003ch3\u003e⚠️ One Control Box Required Per Rooftop Unit\u003c\/h3\u003e\n\u003cp\u003eEach rooftop heat pump or air conditioner requires its \u003cstrong\u003eown dedicated control box\u003c\/strong\u003e. If your RV has multiple units, you need one 9530A751 per heat pump or Mach 8 unit.\u003c\/p\u003e\n\n\u003ch3\u003e⚠️ Not for Zone Control Installations\u003c\/h3\u003e\n\u003cp\u003eThe 9530A751 is \u003cstrong\u003enot a zone control box\u003c\/strong\u003e. For zone-controlled heat pump installations (multi-zone systems with separate temperature control areas), the \u003cstrong\u003e9630A751 zone control heat pump box\u003c\/strong\u003e is required instead — same heat pump function, but engineered for zone control wiring.\u003c\/p\u003e\n\n\u003ch3\u003e⚠️ External 12 VDC Required for Thermostat\u003c\/h3\u003e\n\u003cp\u003eThe 9530A751 control box \u003cstrong\u003edoes not supply 12 VDC power to the wall thermostat\u003c\/strong\u003e. This voltage must be provided externally by the RV's 12V system. Ensure your installation provides a proper 12 VDC feed to the thermostat circuit before completing wiring. Consult the installation instructions for correct wiring diagram and terminal designations.\u003c\/p\u003e\n\n\u003ch3\u003eRequired Wall Thermostat — Sold Separately\u003c\/h3\u003e\n\u003cp\u003eThe 9530A751 requires a compatible wall thermostat to operate. The matching Coleman Mach wall thermostat is the \u003ca href=\"https:\/\/thervsurplus.com\/products\/coleman-wall-thermostat-9420a381-9420a382-digital-heat-and-cool-black\"\u003eColeman 9420A382 Digital Wall Thermostat\u003c\/a\u003e — single-stage heat\/cool control with digital LCD readout and high\/low fan speeds. The 9420A382 replaces the older 8530A3451 thermostat (no longer in production) as the current required thermostat for this control box.\u003c\/p\u003e\n\n\u003ch3\u003eOther Coleman Mach Control Boxes — Pick by AC Type\u003c\/h3\u003e\n\u003cp\u003eThe 9530A751 is the heat pump control box for HP2 and Mach 8 systems. If your installation uses a different AC type, the matching control box is different:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/thervsurplus.com\/products\/coleman-control-box-assembly-8330-752-cool-only\"\u003eColeman 8330-752 Cool-Only Control Package\u003c\/a\u003e — for cool-only AC installations with no heating capability\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"https:\/\/thervsurplus.com\/products\/coleman-ac-control-box-assembly-9330c755-heat-ready\"\u003eColeman 9330C755 Heat-Ready Control Box\u003c\/a\u003e — for cool-only AC with electric heat strip support\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLow Voltage Terminal Functions\u003c\/h3\u003e\n\u003cp\u003eThe 9530A751 uses the following low-voltage terminal designations on the control box strip:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eB (Blue):\u003c\/strong\u003e Completes –12 VDC circuit for all relays\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eY (Yellow):\u003c\/strong\u003e Energizes compressor relay coil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGH (Green):\u003c\/strong\u003e Energizes high fan relay coil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGL (Gray):\u003c\/strong\u003e Energizes low fan relay coil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eW (White):\u003c\/strong\u003e Energizes heat relay coil\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFREEZE:\u003c\/strong\u003e Evaporator freeze sensor connection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRefer to the installation instructions wiring diagram for complete thermostat wire routing and high-voltage connection details.\u003c\/p\u003e\n\n\u003ch3\u003eEvaporator Freeze Sensor Included\u003c\/h3\u003e\n\u003cp\u003eThe 9530A751 includes an \u003cstrong\u003eevaporator freeze sensor\u003c\/strong\u003e (shipped separately in an envelope for field installation at the evaporator coil). The freeze sensor monitors evaporator temperature to prevent ice buildup during extended low-load cooling operation.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e(1) 9530A751 Control Box Assembly\u003c\/li\u003e\n  \u003cli\u003e(1) Evaporator Freeze Sensor (in envelope for field installation)\u003c\/li\u003e\n  \u003cli\u003eInstallation Hardware\u003c\/li\u003e\n  \u003cli\u003eWiring Diagram \/ Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSold Separately\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eWall Thermostat: Coleman Mach 9420A382 (replaces discontinued 8530A3451)\u003c\/li\u003e\n  \u003cli\u003eHeat Strip: 47233-4551 (4700 Series) or 9233-4551 (48000\/49000 Series)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeat pump and heat-ready control box\u003c\/strong\u003e for Coleman Mach HP2 and Mach 8 systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWired for full heat pump function\u003c\/strong\u003e — compressor, high fan, low fan, and heat relays\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectric heat strip ready\u003c\/strong\u003e — supports optional backup heat strip (sold separately)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12 VDC operation\u003c\/strong\u003e on standard RV low-voltage power\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEvaporator freeze sensor included\u003c\/strong\u003e for field installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRequires Coleman Mach 9420A382 wall thermostat\u003c\/strong\u003e (sold separately — replaces discontinued 8530A3451)\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eOne control box required per rooftop unit\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNot a zone control box\u003c\/strong\u003e — for zone heat pump applications, use 9630A751\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExternal 12 VDC feed required\u003c\/strong\u003e for the wall thermostat\u003c\/li\u003e\n  \u003cli\u003eCompact dimensions: 14-1\/8\" L × 3-1\/8\" W × 2-1\/8\" H\u003c\/li\u003e\n  \u003cli\u003eBacked by a 1-year limited manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBrand: Coleman Mach (Airxcel)\u003c\/li\u003e\n  \u003cli\u003ePart Number: 9530A751\u003c\/li\u003e\n  \u003cli\u003eType: Heat Pump \/ Heat-Ready Control Box\u003c\/li\u003e\n  \u003cli\u003eCompatible Units: Coleman Mach HP2 Heat Pumps; Mach 8 AC with Heat Strip\u003c\/li\u003e\n  \u003cli\u003eNOT Compatible With: Cool-only AC units; non-Coleman Mach brands\u003c\/li\u003e\n  \u003cli\u003eVoltage: 12 VDC\u003c\/li\u003e\n  \u003cli\u003eRequired Wall Thermostat: Coleman Mach 9420A382 (sold separately) — replaces discontinued 8530A3451\u003c\/li\u003e\n  \u003cli\u003eCompatible Heat Strip (4700 Series): 47233-4551 (sold separately)\u003c\/li\u003e\n  \u003cli\u003eCompatible Heat Strip (48000\/49000 Series): 9233-4551 (sold separately)\u003c\/li\u003e\n  \u003cli\u003eZone Control: No (use 9630A751 for zone heat pump applications)\u003c\/li\u003e\n  \u003cli\u003ePer-Unit Requirement: One control box required per rooftop heat pump \/ AC unit\u003c\/li\u003e\n  \u003cli\u003eThermostat 12 VDC Supply: Externally supplied by RV (not from this control box)\u003c\/li\u003e\n  \u003cli\u003eDimensions: 14-1\/8\" L × 3-1\/8\" W × 2-1\/8\" H\u003c\/li\u003e\n  \u003cli\u003eIncludes: Control box, evaporator freeze sensor, mounting hardware, wiring diagram\/instructions\u003c\/li\u003e\n  \u003cli\u003eWarranty: 1-year limited manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Coleman","offers":[{"title":"Default Title","offer_id":58088012185903,"sku":null,"price":139.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/7663\/0063\/files\/shopping_7079da1f-4075-4239-b134-71975ced845b.webp?v=1781806373","url":"https:\/\/thervsurplus.com\/products\/coleman-mach-control-box-9530a751-heat-pump","provider":"The RV Surplus","version":"1.0","type":"link"}