Heatcraft Refrigeration Products BEACON II H-IM-79E - Manual (Page 12)

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• Defrost Type – “A-E” - Selection is made for air
defrost or electric defrost coil. This will
automatically set the system factory defaults for
air defrost and electric defrost. (See default
settings.)
• Refrigerant Type - “rEF” - Selection for type of
refrigerant - R-22, R-404A or R-507. Default:
Air defrost is R-22 and for electric defrost it is
R-404A.
• Box Temperature - “bot” - Select box temperature
setpoint. Selection range is -30°F to +70° F.
Defaults: Electric defrost -10°F and air defrost
+35°F.
• Superheat - “SUP” - Evaporator superheat is
controlled by the board on each evaporator.
Each board measures the evaporator saturation
suction temperature and the suction pressure to
determine the superheat. The superheat value
at the evaporator can be changed to ensure a
20°F to 30°F superheat at the Compressor.
Default: 8°F.
• Evaporator Board: Slave? - “SLA” - On multiple
evaporator systems, each evaporator board has
to be programmed to be a Master or a Slave.
Each board is shipped from our factory set as
a Master. You must make this change to each
Slave evaporator. A selection of “YES” is made
for this setting.
The default for each board is a Master, so on
Single Evaporator systems no change is
required.
• Number. of Defrost per Day - “dFn ” - A selection
must be made for the number of defrosts cycles
per day – 1,2,3,4,5,6,8,10 or 12 per day. If no
selection is made, defaults: electric defrost 4 per
day and air defrost 2 per day.
Programming & Reviewing
Programming And Reviewing Settings / Changes (cont’d.)
Use the “PROGRAM REVIEW” button to select these items:
• Defrost fail-safe - “dFF” - This is the maximum
time allowed for a coil to remain in defrost.
Defrost will be terminated if the defrost end
temperature is not attained when this time
has expired. On multiple evaporator systems, this
is controlled by the Master unit. Each board
should have the same setting. Defaults: electric
defrost 30 minutes and air defrost 40 minutes.
• Defrost End Temperature - “dFt ” - This is the
temperature at which the defrost will be
terminated. Defaults: electric defrost +60°F and
air Defrost +45°F.
• Defrost Delay Start Time - “dFS” - This allows
the delay of the start of the first defrost. Default:
0.0 hours.
• Alarm High Temperature - “ALH ” - Temperature
at which a high box temperature alarm will be
triggered. This does not apply during defrost.
Defaults: electric defrost +5°F and air defrost
+50°F.
• Alarm Low Temperature - “ALL” - Temperature
at which a Low Box Temperature alarm will be
triggered. Defaults: Electric Defrost -15°F and Air
Defrost +30°F.
• Alarm Time - “ALt” - Time which High
Temperature or Low Temperature condition must
exceed before alarm is triggered. Default:
60 minutes.
• °F/°C - “F-C” - Select units to display
temperature. Fahrenheit or Celsius. Default:
Fahrenheit. When °C is selected a red dot will
appear in the right bottom corner of the LED
display of the Beacon II board.