Johnson temperature controls a419 manual

22 rows ·  · The A control may be in four operating modes: Cooling/Cut-in, Cooling/Cutout, Heating/Cut-in, Issue Date: Aug. Johnson Controls A Troubleshooting Guide. Johnson Temperature Control A series can be used to control a wide variety of single-stage HVAC or refrigeration equipment. Typical applications include: Retail stores display freezers, walk-in coolers, and reach-in coolers. Space and return air temperature control. Supermarket display cases for products. A controls are available in either NEMA 1, high-impact plastic enclosure suitable for surface or DIN rail mounting or NEMA 4X watertight, corrosion-resistant surface-mount enclosures. Figure 1: A Temperature Control with NEMA 1 Enclosure and A99 Temperature Sensor Features and Benefits ˜ Easy-to-Read Front-Panel Liquid Crystal Display.

An LED indicates the controls’ output relay On/Off status. The A controls are available in 24 VAC or / VAC powered models. The A controls have heating and cooling modes, adjustable setpoint and differential, an adjustable anti-short cycle delay, and a temperature offset function. The setpoint range is to °F. A Series Electronic Temperature Controls with Display and NEMA 1 or NEMA 4X Watertight Enclosures Product/Technical Bulletin For example, if the anti-short cycle delay is set for 7 minutes, the A control will not restart the equipment for 7 minutes after the equipment has cut out, even if the cut-in temperature value is reached. · A front panel Light-Emitting A99 temperature sensor. The sensor may be removed Diode (LED) indicates the output relay status. The and replaced with any compatible Johnson Controls control has a setpoint range of to °F Page 2 /4 /16 Wiring /4 WARNING: Risk of Electrical Shock.

The manual tells you how to program the lowest temp, highest temp, and anti-short-cycle delay. The temperature controller was purchased about 18 months ago, and. The A series controls are single-stage, electronic temperature controls with a Single-Pole, Double-Throw output relay. A Series Standard Electronic Temperature Controls with Power Cords Installation Instructions. 2. Parts Included. Each A Control includes a Johnson.