Ambient Sensing Thermostat FM Class 1 Div 1
The1660-18912 thermostat is an explosion-proof and weatherproof temperature control in a lightweight die cast enclosure with a calibrated dial and an external knob adjustment for outdoor or indoor locations. The thermostat is approved for use in Class I, Groups B, C and D; Class II, Groups E, F, and G; and Class III hazardous locations. The liquid-lled thermal system, with its stainless steel sensor stem, provides a very dependable and accurate control system.
For heater control, low alar m (close on falling temperature) use COM and NC. For high alarm (close on rising temperature) use COM and NO.
Enclosure: Die cast aluminum with gray aluminum lacquer. NEMA 4X, 7, 9; weather-proof, explosion proof. Class I: Groups B, C, D; Class II
Groups: E, F, G, Class III
Connection: Screw terminals on terminal block through 3/4-NPT hub
Switch: SPDT UL listed with external knob/dial adjustment and tamper-proof cover
Rating: 22 amps at 480 VAC
Range: 15° – 140°F
Sensor: 304 SS sensor stem
Approval: UL listed
Accuracy: ±1% of adjustment range