A421 Thermostat . How To Set The A421 Thermostat Polar King YouTube Page 1 The A421 Controls require an A99 sensor, and each A421 Control includes an A99 sensor Any A99 Series sensor works with the A421 Series controls
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The A421 controls are available in low voltage 24 VAC and high voltage 120 or 240 VAC models, which provide options for most refrigeration and HVAC applications An LED indicates the On/Off status of the output relay
Flexotherm ATCFT A421 Adjustable Thermostatic Controller, 110 Volt NEMA4 The A421 series controls are single-stage, electronic temperature controls with a Single-Pole, Double-Throw (SPDT) output relay Long Term W1609-101 Refrigeratior Thermostat Temperature Controller from -30 Degrees F to 90 Degrees F (-34 Degrees C to 32 Degrees C Any A99 Series sensor works with the A421 Series controls
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A421ABC04C Johnson Controls A421ABC04C Single Stage Digital . The A421 controls provide heating or cooling control, sensor offset, temperature setback, adjustable anti-short cycle delay. Current draw: 1.8 VA maximum; Temperature control range: -40 to 212°F; Differential: 1 to 30°F
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