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purpose of arriving at easily taken and understood
data which, coupled with other observations, may be
used to determined whether a display refrigerator is
working as intended:
a) INSTRUMENT – A stainless steel stem-type ther-
mometer is recommended and it should have a
dial a minimum of 1 inch internal diameter. A test
thermometer scaled only in Celsius or dually
scaled in Celsius and Fahrenheit shall be accurate
to 1°C (1.8°F). Temperature measuring devices
that are scaled only in Fahrenheit shall be accu-
rate to 2°F. The thermometer 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 air-
stream where the air first 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 first be determined that the
refrigerator is refrigerating 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/
appearance.
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 prod-
uct is above proper temperature, 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 flow
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?
9. Are display signs blocking or diverting air-
flow?
10. Are the coils of the refrigerator iced up?
11. Is the store ambient over 75°F, 55% RH as set
forth in ASHRAE Standard 72 and ASHRAE
Standard 117?
Appendices, Cont'd
12. Are the shelf positions, number, and size
13. Is there an improper application or control
14. Is the evaporator fan motor/blade inopera-
15. Is the defrost time excessive?
16. Is the defrost termination, thermostat (if used)
17. Are the refrigerant controls incorrectly ad-
18. Is the air entering the condenser above design
19. Is there a shortage of refrigerant?
20. Has the equipment been modified to use
APPENDIX D. – Recommendations to user -
1.0 The manufacturer should provide instructions and
recommendations for proper periodic cleaning. The
user will be responsible for such cleaning, including the
cleaning of low temperature equipment within the
compartment and the cooling coil area(s). Cleaning
practices, particularly with respect to proper refrig-
erator unloading and warm-up, must be in accordance
with applicable recommendations.
1.1 Cleaning of non frozen food equipment should include
a weekly cleaning of the food compartment as a
minimum to prevent bacteria growth from accumulat-
ing. Actual use and products may dictate more fre-
quent cleaning. Circumstances of use and equipment
design must also dictate the frequency of cleaning the
display areas. Weekly washing down of the storage
compartment is also recommended, especially for
equipment subject to drippage of milk or other liquids,
or the collection of vegetable, meat, crumbs, etc. or
other debris or litter. Daily cleaning of the external
areas surrounding the storage or display compart-
ments with detergent and water will keep the equip-
ment presentable and prevent grime buildup.
1.2 Load levels as defined by the manufacturer must be
observed.
1.3 The best preservation is achieved by following these
rules:
12
other than recommended by the manufac-
turer?
system?
tive?
set too high?
justed?
conditions? Are the condenser fins clear of
dirt, dust, etc.?
replacements for CFC-12, CFC-502 or other
refrigerant? If so, have the modifications been
made in accordance with the recommenda-
tions of the equipment manufacturer? Is the
refrigerator charged with the proper refriger-
ant and lubricant? Does the system use the
recommended compressor?
IGUP-RID-9610(9911)
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