Rev. 0608
31
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 determine 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
the equipment manufacturer? 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 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.
appendices (cont'd)
