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