Rev. 0909
15
appendices (cont'd)
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 determined whether a display
refrigerator is working as intended:
a) INSTRUMENT - A stainless steel stem-type
thermometer 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 accurate to
°F. The thermometer should be checked for
proper calibration. (It should read 3°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 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 product is above proper temperature,
checks should be made for the following:
1. Has the refrigerator been loaded with
warm product?
. 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
airflow?
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 7 and
ASHRAE Standard 117?
1. Are the shelf positions, number, and size
other than recommended by Hussmann?
13. Is there an improper application or control
system?
14. Is the evaporator fan motor/blade
inoperative?
15. Is the defrost time excessive?
16. Is the defrost termination, thermostat
(if used) set too high?
17. Are the refrigerant controls incorrectly
adjusted?
18. Is the air entering the condenser above
design conditions? Are the condenser fins
clear of dirt, dust, etc.?
19. Is there a shortage of refrigerant?
20. Has the equipment been modified to use
replacements for CFC-1,
CFC-50 or other refrigerant? If so,
have the modifications been made in
accordance with the recommendations
of Hussmann’s equipment? Is the
refrigerator charged with the proper
refrigerant and lubricant? Does the system
use the recommended compressor?
appendix d. - Recommendations to user
1.0 Hussmann 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 refrigerator
unloading and warm-up, must be in accordance
with applicable recommendations.
es continued
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 accumulating. Actual use and
products may dictate more frequent 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
