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Modularm introduces the DL-35 Door Monitor (Patented), a more compact version of the DAC-55 Door Monitor. The DL-35, has virtually all of the same features as the DAC-55 with the exception of Refrigeration Control Functions. Click here for more information


Recently, in cooperation with King’s Supermarkets of Parsipanny, NJ, some in-store testing was performed on the DAC-55 Door Monitor. The purpose of this testing was to accumulate data on the effectiveness of the DAC-55 in helping to reduce energy costs. In order to accumulate this data, Monitoring/Recording equipment was installed onto a cooler and a freezer. This equipment recorded the number of times that compartment doors were opened, the number of cumulative hours that doors were opened and the number of cumulative hours that interior compartment lights were turned on. The entire testing process lasted for a total of 9 weeks and was divided into three sequential 3 week periods:

1st 3 weeks: Baseline Phase – Monitoring/Recording equipment was installed and data was recorded without installing the DAC-55’s. This produced numbers indicative of normal existing operation.

2nd 3 weeks: Training Phase – DAC-55’s were installed. The Door Ajar Alarm Time Delay was set for 15 minutes and data was again recorded. This produced numbers indicative of operation when personnel were being trained by the DAC-55 to be more responsive to closing compartment doors.

3rd 3 weeks: Results Phase – Data was again recorded. This produced numbers indicative of operation when behavior of personnel had been modified as a result of the DAC-55’s having been installed.

The following resultant data was produced:


Number of hours door was opened:

Analysis, Walk-in Cooler: In the baseline phase, it is apparent that personnel were leaving the door opened unnecessarily for extended periods of time and that lights were left on almost constantly, 24 hours a day. Both of these conditions wasted a substantial amount of energy. Installation of the DAC-55 had a dramatic impact on reducing these numbers, thus lowering operating expenses. Simultaneously, the number of times that personnel opened and closed the door increased greatly in order for personnel to continue to gain access.


Analysis, Walk-in Freezer: This compartment was not used as frequently as the Deli cooler, as indicated by the number of times that the door was opened. However, the number of hours that the door was opened was higher in the Baseline phase than it was in the later phases. This would indicate that, in normal usage, the compartment door was occasionally left opened or ajar. Once the DAC-55 was installed, the door ajar function alerted personnel to this condition, the door was closed and the number of hours that the door was opened was reduced. As with the walk-in cooler, lights were again left on unnecessarily. The DAC-55 substantially reduced these numbers in the later phases as well.


Based on the accumulated data, it is apparent that the DAC-55 will successfully help to reduce energy costs by minimizing the amount of time that compartment lights are on and by helping walk-ins to operate more efficiently. Over time, the numbers shown in this study after the DAC-55’S were installed should continue to improve as personnel become further trained and conditioned, resulting in a more rapid payback time and greater energy savings. Benefits will vary depending on the number of light fixtures in a respective compartment, performance of store personnel in keeping doors closed and overall energy costs. Product integrity should improve as well, as keeping doors closed will help in maintaining compartment temperatures.