Hussmann Q3-DC Installation And Operation Manual page 24

Rev. 0907
above the FDA Food Code 1993 temperature for
potentially hazardous food will be the fi rst indica-
tion that an evaluation should be performed. It is
expected that all refrigerators will keep food at the
FDA Food Code 1993 temperature for potentially
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 determined whether a display refrigera-
tor 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 diam-
eter. A test thermometer scaled only in Celsius
or dually scaled in Celsius and Fahrenheit shall
be accurate to 1°C (1.8°F). Temperature mea-
suring devices that are scaled only in Fahren-
heit shall be accurate 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
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 determined that
the refrigerator is refrigerating and has oper-
ated 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 operat-
ing problems, such as unsatisfactory product,
feel/appearance.
e) CONCLUSIONS – In the absence of any ap-
parent undesirable conditions, the refrigerator
should be judged to be operating properly. If it
is determined that such condition is undesir-
able, 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 light-
Appendices Continued
APPENDIX D. – Recommendations to user -
Refrigerated
1.0 Hussmann should provide instructions and recom-
mendations 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). Clean-
ing 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 compart-
ment 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
24
ing 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
airfl ow?
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?
12. 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 inopera-
tive?
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 fi ns
clear of dirt, dust, etc.?
19. Is there a shortage of refrigerant?
20. Has the equipment been modifi ed to use
replacements for CFC-12, CFC-502 or
other refrigerant? If so, have the modifi ca-
tions been made in accordance with the
recommendations of Hussmann equip-
ment? Is the refrigerator charged with the
proper refrigerant and lubricant? Does the
system use the recommended compres-
sor?