Appendix C. - Field Recommendations - Hussmann CR3-F Installation And Operation Manual

quency and length without substan-
tially exceeding the actual needs. This
should include checking the electrical
or refrigerant circuits to make sure that
defrosts are correctly programmed for
all the refrigerators connected to each
refrigeration system.
e) Recording instruments should be used
to check performance.
APPENDIX C. – Field Recommendations -
Recommendations for fi eld evaluating the performance
of retail food refrigerators and hot cases
1.0 The most consistent indicator of display
refrigerator performance is the tempera-
ture of the air entering the product zone
(Refrigerated see Diagram 1, Appendix
A). In practical use, the precise determi-
nation of return air temperature is ex-
tremely diffi cult. Readings of return air
temperatures will be variable and results
will be inconsistent. The product tempera-
ture alone is not an indicator of refrigera-
tor performance.
NOTE: Public Health will use the tempera-
ture of the product in determining if the
refrigerator will be allowed to display po-
tentially hazardous food. For the purpose
of this evaluation, product temperature
above the FDA Food Code 1993 tempera-
ture for potentially hazardous food will
be the fi rst indication that an evaluation
should be performed. It is expected that
all refrigerators will keep food at the FDA
Food Code 1993 temperature for poten-
tially hazardous food.
1.1 The following recommendations are made
for the purpose of arriving at easily taken
and understood data which, coupled with
other observations, may be used to de-
termined whether a display refrigerator is
working as intended:
a) INSTRUMENT – A stainless steel
stem-type thermometer is recom-
mended and it should have a dial a
minimum of 1 inch internal diameter. A
test thermometer scaled only in Cel-
sius or dually scaled in Celsius and
Fahrenheit shall be accurate to 1°C
(1.8°F). Temperature measuring devic-
es that are scaled only in Fahrenheit
shall be accurate to 2°F. The ther-
mometer should be checked for proper
calibration. (It should read 32°F when
the stem is immersed in an ice water
bath).
b) LOCATION – The probe or sensing
element of the thermometer should be
located in the airstream where the air
fi rst enters the display or storage area,
and not more than 1 inch away from
the surface and in the center of the
discharge opening.
c) READING – It should fi rst be deter-
mined that the refrigerator is refrigerat-
ing and has operated at least one hour
since the end of the last defrost period.
The thermometer reading should be
made only after it has been allowed
to stabilize, i.e., maintain a constant
reading.
d) OTHER OBSERVATIONS – Other
observations should be made which
may indicate operating problems, such
as unsatisfactory product, feel/appear-
ance.
e) CONCLUSIONS – In the absence of
any apparent undesirable conditions,
the refrigerator should be judged to be
operating properly. If it is determined
that such condition is undesirable, i.e.,
the product is above proper tempera-
ture, checks should be made for the
following:
1. Has the refrigerator been loaded with
warm product?
2. Is the product loaded beyond the "Safe
Load Line" markers?
3. Are the return air ducts blocked?
4. Are the entering air ducts blocked?
5. Is a dumped display causing turbulent air
fl ow and mixing with room air?
6. Are spotlights or other high intensity
lighting directed onto the product?
7. Are there unusual draft conditions (from
heating /air-conditioning ducts, open
doors, etc.)?
8. Is there exposure to direct sunlight?
8. Are display signs blocking or diverting
airfl ow?
9. Are the coils of the refrigerator iced up?
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