AIRFLOW & DEFROST
AIRFLOW & PRODUCT LOAD
H
illphoenix cases provide maximum product capacity within the
refrigerated air envelope. Please keep products within the ap-
propriate load limit.
It is important that you do not overload the food product display
so that it
impinges on the airfl ow pattern (Fig. 8). Overload-
ing will cause malfunction and the loss of proper temperature
levels, particularly when discharge and return air sections are
covered.
DEFROST & TEMPERATURE CONTROLS
Cases are equipped with either Electric, Hot Gas, or Timed-Off
defrost at the owner's option.
The hot gas defrost termination sensor bulb and probe are
attached to the dump line which is in the front, left-hand side
of the case.
W A R N I N G
Always keep product within the designated air
curtain. Failure to do so may result in case
malfunction and product losing proper tempera-
ture, resulting in sub-standard operation and
increased chances of food contamination.
▲
!
Fig. 8 Airflow pattern
HUMIDIFICATION SYSTEMS
The starting point for proper humidity levels in the AGB display
case are typically around 75% RH when stocked with product.
The RH will vary during defrost or cycling. A humidification
system is recommended to ensure consistent performance in
all store ambient. Several factors to consider are listed below
and adjustments may need to be made to the setting for par-
ticular configurations to maintain humidity levels within a case.
1. Store Conditions -
Hillphoenix cases are designed to oper-
ate in an air-conditioned store that maintains a 75°F
(24°C) store temperature and 55% (max) relative humidity
(ASHRAE conditions). Case operation will be adversely
affected by exposure to excessively high ambient tempera-
tures and/or humidity.
2. Desired Case Temperature -
Hillphoenix recommends a
set point of 33˚-36˚F. If the meat is too cold the meat may
freeze and the aging process will slow or stop. If the meat
is too warm it will spoil.
3. Dry Aging Process -
Dry aged beef is typically stored for
14-21 days in a humidity and temperature controlled envir-
norment. The productmoisture content, desired shrink and
approximate timespent in the aging process all are factors
related to the amountof humidity the product releases into
the case environment.
All set points and parameters are starting point and
must be adjusted to meet ambient conditions and
desired product temperatures.
If store conditions are very dry, an optional humidification sys-
tem is recommended.
If your case is equipped with a Dixell temperature and humidity
controller, see Appendices B1-B4 for operating instructions.
DETERMINING SUPERHEAT
To identify proper superheat settings, complete the following:
1. Obtain suction pressure from access port; obtain suction
line temperature from area near TXV bulb at the outlet of
evaporator coil.
2. Using the suction pressure reading, convert pressure to
temperature using temperature pressure chart (
see
Appendix C1
).
3. Finally, subtract the converted temperature reading from
the actual temperature reading for superheat setting.
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