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Installation Sheets Manual Temperature Controls Section Technical Bulletin Issue Date 121 A19AAH 0479 A19AAH Type Mixed Air Thermostat Low Voltage - Narrow Differential Application The Type A19AAH is designed for use as a mixed air thermostat in the output circuit of a Cybertronic controller. It has a 7-1/2 ft liquid filled averaging element with an operating range of 40 to 120°F (4 to 49°C). The element responds to the average temperature along its entire length. This two-position thermostat has a sealed, dust-tight, SPST switch that opens on a temperature decrease. The A19AAH has a fixed differential of 3/4°F and a visible dial with a screwdriver set point adjustment. The A19AAH may be mounted in any convenient position on a flat surface using the four mounting holes in the back of the case. When mounting on a very rough surface use only the top two mounting holes. Wiring ! CAUTION: Disconnect power supply before wiring connections are made to prevent possible electrical shock or damage to equipment. All wiring should conform to diagrams furnished with the instrument, the National Electrical Code or local regulations. ! CAUTION: Use No. 8-32 × 1/4 in. terminal screws. Longer terminal screws can damage the switch. Adjustment A screwdriver set point adjustment is provided with a dial indicator located on the cover. The low cutout stop is an integral part of the thermostat and can be adjusted by the sliding stop. To set the low cutout stop: 1. Set the dial to the temperature desired. 2. Remove the cover. 3. Slide the dial stop to the front of thermostat (toward dial) against the step located behind the dial, see Fig. 2. Note: Type A19AAH Thermostat. An exact stop setting may not be possible. Set the stop to the closest step corresponding to the desired setting. Specifications © 1979 Johnson Controls, Inc. Code No. LIT-121025 Part No. 997-750 1 Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI 53202 2 A19AAH Technical Bulletin Printed in U.S.A.