Heatcraft Refrigeration Products H-IM-79B default, Defaults: 0.5 hours to 23.5 hours, F and air Defrost +45, Defaults: electric defrost +60, Default: 8, F and air defrost +35, Defaults: Electric defrost -10, Default: Air defrost is R-22 and for electric defrost it is R-404A., Defaults: electric defrost 4 per day and air defrost 2 per day, Defaults: electric defrost 30 minutes and air defrost 40 minutes.

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PROGRAMMING AND REVIEWING SETTINGS/CHANGES (cont’d.)
Use the “PROGRAM REVIEW” button to select these items:
• 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.) Please note that the refrigerant type default for air defrost is R-22 and
for electric defrost it is R404A. All units are shipped with factory defaults 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 measure 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.
• No. 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 .
• 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.
Defaults: 0.5 hours to 23.5 hours .
Programming & Reviewing