To convert to Celsius units, press the UP & Down buttons simultaneously. Sign In. When you contact your Johnson Controls/PENN distributor, have the model number of the control available. Johnson Controls/PENN® Distributer or Sales Representative. The outdoor damper is installed to close when the fan stops. Controller Control Unit Switch Control Systems Thermostat. The thermostats have an adjustable high temperature stop. Troubleshooting. Penn A421 Series Pdf User Manuals. The thermostat is located just at the back of the dial. The system keeps running until it reaches the Cut Out point which is 37 °F where it shuts off and awaits the next call for cooling. This is the sixth in our series of articles on walk-in coolers and freezers. Features • easy-to-read, bright, adjustable backlit LCD screen displays the temperature, parameters, and status clearly and allows you to adjust LCD brightness for the ambient light conditions. The reset must be pushed and released before the contacts can be reclosed. Page 23 Johnson Controls/PENN distributor or sales representative. 21. Custom icons on the display provide visual cues on system and control status. An important piece of the puzzle is the thermostat. Remove the plastic cover to expose the thermostat. Johnson Controls A19ABC-24 - Remote Bulb Temperature Control, Adj. 21. 22. Step 5: After cleaning thermostat, check it again with glass thermometer, as detailed in Steps 1 and 2. Controls have SPST contacts which open on temperature increase or they may be supplied in single-pole, double-throw contact action. Then retighten screws. A special wrench (Part 836-61) required to adjust the keyed stop is provided with each thermostat. If thermostat is not straight, loosen mounting screws and adjust thermostat until it is level. View online or download Penn A421 Series Installation Manual. Adjusting the Control in Restricted Mode. Fault Codes. Diff. ... Repositioning the Jumper to Restrict Control Adjustment. Example: Type A19ABC is a remote bulb temperature control with NEMA 1 enclosure, adjustable differential, SPDT contacts and standard differential (1 hp). The control is set to start refrigeration if the box warms up to 40 °F That's called the Cut In point. A walk-in’s main job, not to put too fine a point on it, is to be cold. 3 to 12F (-30 to 100F) - Johnson Controls A19 Series temperature controls are designed to cover a broad range of uses for heating and general purpose requirements. You can find this number on the label inside the cover of the control. Step 4: If thermostat has mercury vial inside, use level to make sure unit is straight. 21. adjustment and a remote bulb mounting clip. Set the relative humidity control according to the current outdoor temperature. This provides conversion to knob, concealed screwdriver slot or external screwdriver slot adjustment. The A19ANC and A19ANF thermostats have a fixed differential. See ˜gure 13. The thermostat dial then needs to be turned fully counterclockwise or at the zero setting. Press them again to return to Fahrenheit units. In this example there is a 3 °F differential between the cut in and cut out points. Notes: Make sure the Touchpad Lock jumper is in the unlocked (installed) position before adjusting the control. The thermostats with manual reset will lock out when the sensed temperature drops below the set point. All Series A70 thermostats are designed for use only as To check if the thermostat is working fine, a simple test is required. An ohmme ter will be required for the following test and set to the lowest scale. set point, the thermostat will stop the fan. As seen throughout this article series, walk-ins are only as good as the components that are included in it. The A419 control is set at the factory to display in Fahrenheit temerpature units. More Penn Manuals . 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