A421 Thermostat. A421 Thermostat Wiring Diagram and Installation Guide They feature a lockable front-panel touchpad for setup and adjustment, and a Liquid Crystal Display (LCD) for viewing the temperature and status of other functions Do not replace an A99 Series sensor with any other brand, series, or type of temperature sensor
Penn A421 Wiring Diagram Ecoced from ecoced83.blogspot.com
Includes integral timer for off-cycle defrost control. They feature a lockable front-panel touchpad for setup and adjustment, and a Liquid Crystal Display (LCD) for viewing the temperature and status of other functions
Penn A421 Wiring Diagram Ecoced
Current draw: 1.8 VA maximum; Temperature control range: -40 to 212°F; Differential: 1 to 30°F The A421 series controls are single-stage, electronic temperature controls with a Single-Pole, Double-Throw (SPDT) output relay A Light-Emitting Diode (LED) indicates the controls output relay On/Off status
A421 Digital Freezer Temperature Controller (Thermostat) Home Brew Ohio. Any A99 Series sensor works with the A421 Series controls A421 controls feature a backlit LCD with adjustable brightness and a three-button touchpad interface that can be set to restrict adjustments
Introduction to PENN A421 Electronic Temperature Controls with Off. Long Term W1609-101 Refrigeratior Thermostat Temperature Controller from -30 Degrees F to 90 Degrees F (-34 Degrees C to 32 Degrees C A Light-Emitting Diode (LED) indicates the controls output relay On/Off status