Real Life Data

Real Life Data 2018-12-28T00:35:01+00:00

Case Studies

BH site
April Summary Report

This report covers the BH site for the month of April, 2018.

Summary of findings:
1) 2 alarms were triggered in April. Each will be outlined below with conclusions and recommendations.

Alarm 1   Door Left Open

April 4, an alarm was raised just after 2:00 AM. The walk in refrigerator unit fell below the trigger limit. The temp of the walk in refrigerator dropped from set 40 deg F down to 16 deg F. The temperature in the walk in fell below freezing for about 7 hours total, starting at 11:43 pm through to 7:08am the following morning. A service technician was dispatched and concluded the walk in was operating properly. The conclusion….. The freezer door likely was left open, driving the temperature of the walk in refrigerator below freezing. The walk in refrigerator performed a bit erratically for the remainder of the day and returned to normal operation by the following day.

Recommended corrective action: Add a door sensor to detect when either walk in door is left open.

• Alarm 2   Door Left Open

April 11, an alarm was raised at about 5am. The walk in refrigerator was above alarm trigger level. The event started at 3:06am with temperature of the walk in increasing from set range to about 50 Deg F for about 3 hours. The temperature readings in the walk in reached 51 deg F. A call was made to the store manager at 6:00am, just shortly after, the temperature of the walk in came down to set levels. A service technician was dispatched and concluded the unit was operating properly. The conclusion…. The walk in refrigerator door was likely left open. Duration of the temperature increase likely had impact to contents of the walk in as duration was lengthy enough to have impacted content temperatures.

Recommendations: Install a door sensor and audible alarm to detect when the door has been left open for prolonged time to protect contents.

1) Concerns Periodic Elevated Temperature
One concern item was identified through the month.

The refrigerated work table showed periods when sensor temperature went above 40 deg F. Unsure without further investigation what the cause of elevated cycles is. Recommendation: a complete service of the refrigerated work table to investigate potential causes. The sensor in the work table is well inside the unit, reached 45 deg F a number of times through repeated cycles. This likely means that temperature of food bins was above the sensor temperature. Further monitoring of this work table to observe behaviors.

May Findings May 2018
BH Store May
There are two findings in the month of May:
1 Prep Table  Elevated Temperatures
The prep table appears to go through cycles where the core temperature raises above 5deg C (40deg F) for a prolonged period of time. The timing of these occurrences is most common in the mornings, for multiple hours.
The main concern…. The sensor is buried in the middle of the prep table and likely represents the core case temperature. Food located at the outer surface is more than likely at a much higher temperature.
1 Have a qualified professional technician take a look at the case to see if its operational temperature can be adjusted down slightly to compensate for the elevated temperatures seen periodically in the morning.
2 Take a look operationally at the case to see if procedures for opening/closing the case are in place to protect food safety, and save energy

2. Over Cooled Room Nights

Its been observed room air temperature will often drop significantly some nights. This could be due to outside temperatures being cool, it could be settings on the AC system, it could be because heat sources at these hours are not present allowing room temperatures to drop.

Recommendation. Have a licensed professional technician take a look at how the site AC systems are programmed. There’s opportunity to reduce heat/AC costs.

Case 2  NG Restaurant

Alarm 1. Door Left Open, Door Not Latched

This is a door for a walk in refrigerator being opened, perhaps for restocking. After the activity that drove the door being open was completed, the refrigerator does not return to temperature. The signature of the slowly rising temperature would indicate the door was not completely shut. The result, temperatures in the walk in were above 40 degrees for about 5 hours.

Recommendations…. put door sensors on the walk in to  remove any doubt if the door is open. Have a licensed refrigeration technician take a look at the latch as it might not be working properly.

Alarm 2. Hot Room Effects Preparation Table
Perfect example of how proper function of one refrigeration element can impact others in the same room.

The lower pic is return air temperature in the kitchen. The AC unit on the roof has failed, allowing air temperatures to go above 100 degrees late afternoons.

The upper pic is a food preparation station. It does not have enough cooling power to overcome the heat in the kitchen. Daily, the internal temperatures of this station go above 40 degrees for multiple hours.

Remedy… have a licensed service technician look at the room AC unit.

Reference…. Good Performing Freezer
The above is an image of a walk in freezer. Its in good operating condition with regular defrost cycles and rapid temperature drop after defrost.