{"product_id":"dramm-mechanical-thermostat","title":"Dramm - Mechanical Thermostat, Single and Two Stage","description":"\u003ch2\u003eMechanical Thermostat, Single and Two Stage\u003c\/h2\u003e\u003cp\u003eDramm's mechanical thermostats switch greenhouse heating, cooling and ventilation equipment from a PVC enclosure rated IP54, using a stainless steel coiled sensor instead of a bimetal strip in a painted steel box. The switch contacts are SPDT and carry no load: one set opens on a temperature rise as the other closes, so the thermostat drives a relay or contactor rather than the equipment itself. Control range is 30 to 104 F (0 to 40 C) with a differential of about 1 C, and the dial is recalibrated in place against a reference thermometer rather than being sent back. The housing is rain tight and drip proof but is not rated for immersion, so mount it in the zone air and not where it can be washed down.\u003c\/p\u003e\u003cp\u003eThe choice is how many switch points you need out of one box. The Single Stage SPDT version has one dial, one stainless coil sensor and one set of SPDT contacts, which is enough to bring a unit heater or a single fan bank on and off at one setpoint. The Two Stage SPDT version has two dials, marked minimum and maximum, with two sensors and two contact sets, so it can stage two heaters, run a two speed fan, or open louvers at the first setpoint and take fans to high at the second. Wiring is otherwise identical on both: the ground goes to the clip provided, the cable enters through the watertight connector, and the contacts switch a control circuit rather than the load. Both cover the same 12 to 240 V range and the same 30 to 104 F control band, so the second stage is the only functional difference between them.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 to 104 F (0 to 40 C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDifferential\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApproximately 1 C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 to 240 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContacts\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo load SPDT; one set on the single stage, two sets on the two stage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStainless steel coil; one on the single stage, two on the two stage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eEnclosure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePVC, IP54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIngress\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRain tight and drip proof; not rated for immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCSA approved\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eConfigurations\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eStages\u003c\/th\u003e\n\u003cth\u003ePart number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSingle Stage SPDT\u003c\/td\u003e\n\u003ctd\u003eT41\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTwo Stage SPDT\u003c\/td\u003e\n\u003ctd\u003eT42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePVC housing rated IP54 stands up to the wet, corrosive air of a greenhouse\u003c\/li\u003e\n\u003cli\u003eStainless steel coiled sensor reads zone air directly, with no painted steel to rust through\u003c\/li\u003e\n\u003cli\u003eNo load SPDT contacts: one set opens on a temperature rise as the other closes\u003c\/li\u003e\n\u003cli\u003eControl range of 30 to 104 F (0 to 40 C) with a differential of about 1 C\u003c\/li\u003e\n\u003cli\u003eDial recalibrates in place: line the mark up with a reference thermometer, then rotate the star hub until it clicks\u003c\/li\u003e\n\u003cli\u003eWatertight cable connector and a dedicated ground clip are built into the enclosure\u003c\/li\u003e\n\u003cli\u003eSwitching load limits are printed on the thermostat; wire through a relay or contactor and do not exceed them\u003c\/li\u003e\n\u003cli\u003eCSA approved\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSingle setpoint on and off control of a unit heater\u003c\/li\u003e\n\u003cli\u003eExhaust fan and intake louver control in one greenhouse zone\u003c\/li\u003e\n\u003cli\u003eStaged heating, bringing a second heater on as the temperature keeps falling\u003c\/li\u003e\n\u003cli\u003eTwo speed fan control with louvers opening at the first setpoint and high speed at the second\u003c\/li\u003e\n\u003cli\u003eTemperature control in headhouses, packing sheds, warehouses and livestock buildings\u003c\/li\u003e\n\u003cli\u003eReplacing painted steel thermostats that have corroded or drifted out of calibration\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eWire one to a Dramm AME horizontal air flow fan bank or a JetFog cooling system so the fans respond to measured zone temperature instead of a timer.\u003c\/em\u003e\u003c\/p\u003e","brand":"Dramm","offers":[{"title":"Single Stage SPDT","offer_id":52800841023799,"sku":"T41","price":167.2,"currency_code":"USD","in_stock":true},{"title":"Two Stage SPDT","offer_id":52800841056567,"sku":"T42","price":272.8,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/0341\/5863\/files\/DRMT41.webp?v=1786150770","url":"https:\/\/www.blacklabelsupply.io\/products\/dramm-mechanical-thermostat","provider":"BLACK LABEL","version":"1.0","type":"link"}