Appendix D. - Recommendations To User - Refrigerated - Hussmann AB Installation And Operation Manual

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
Appendices (Cont'd)
/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 the manufacturer?
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?
Appendix D. - Recommendations to User -
Refrigerated
1.0 Hussmann Corporation provides 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.
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 vegetable, meat, crumbs, etc. or other debris
or litter. Daily cleaning of the external areas
surrounding the storage or display compartments
with detergent and water will keep the equipment
presentable and prevent grime buildup.
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