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<br />There's 1 relays on this controller. Refrigeration and heating mode can be set through the menu. Can be used for domestic freezer, water tanks, refrigerator, industrial chiller, bolier, steamer, industrial equipments and other temperature-controlled systems. 
<br />For example, If you choose Heat mode(Set HC to H). Set Temperature Value to 80°F. Set CP value to 20°F. 
<br />The relay will be connected when the temperature drop to 60°F(set temperature value-CP value). And the relay will be disconnected when the temperature reaches 80°F.
<br />If you choose Cool mode(Set HC to C). Set Temperature Value to 80°F. Set CP value to 20°F.
<br />The relay will be connected when the temperature reaches 100°F(set temperature value+CP value). And the relay will be disconnected when the temperature drops to 80°F.
<br />Our video shows exactly how this functions.
<br />Size:
<br />Front panel size: 75(L) x 34.5(W)(mm)
<br />Mounting size:71(L) x 29(mm)
<br />Product size:75(L) x 34.5(W) x 85(D)(mm)
<br />Sensor Cable length: 1m (include the probe)
<br />Specifications:
<br />Measure range: -4°F~+194°F
<br />Slew range of temperature: 1°F-30°F
<br />Resolution: 0.1°F
<br />Accuracy: ±1°F (-4°F~150°F)
<br />Power supply: 110V AC, 50/60Hz
<br />Power consumption: less than 3W
<br />Relay contact capacity: Cool(10A/250VAC);Heat(10A/250VAC)
<br />Data retention: Yes
<br />Compressor delay protection: YES
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<br />Item Include:
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<br />1 x 110V temperature controller
<br />1 x NTC sensor (1m cable)
<br />1 x English Manual
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