Federal NSSL378, Installation & Operation Instructions

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Defrost Cycle
The electronic control is programmed to initiate defrost by two different methods. There are (3)
programmed defrost cycles in the control which will initiate a defrost cycle every 8 hours. The unit does
not have a time clock so the defrost cycles cannot be set for any specific time of day.
The electronic controller uses time to initiate the defrost cycle, and temperature to terminate the defrost
cycle. The controller
also has an ‘On demand’ defrost feature that will initiate a defrost cycle when the
temperature differential between the evaporator temperature and the air temperature is more than 15
degrees for 5 minutes after 30 minutes into the refrigeration cycle.
Control Factory Settings
The control parameters are set at the factory and cannot be manually changed in the field. Control
parameter changes can only be made by downloading a new set of parameters using a program chip
supplied by Federal Industries
TAB PARAMETER DESCRIPTION RSSM3078
CONFIGURATION
Controller Operation Temperature Units Degrees Fahrenheit
Defrost Termination Method Evaporator Sensor
SET-POINTS
Setting “1” Cut-In (Warmest Setting)
39ºF
Setting “1” Cut-Out (Warmest Setting)
34ºF
Setting “2” Cut-In
39ºF
Setting “2” Cut-Out
32.7ºF
Setting “3” Cut-In
39ºF
Setting “3” Cut-Out
31.5ºF
Setting “4” Cut-In
39ºF
Setting “4” Cut-Out
30.2ºF
Setting “5” Cut-In
39ºF
Setting “5” Cut-Out
29ºF
Setting “6” Cut-In
39ºF
Setting “6” Cut-Out
27.7ºF
Setting “7” Cut-In
39ºF
Setting “7” Cut-Out
26.5ºF
Setting “8” Cut-In
39ºF
Setting “8” Cut-Out
25.2ºF
Setting “9” Cut-In (Coldest Setting)
39ºF
Setting “9” Cut-Out (Coldest Setting)
24ºF
COMPRESSOR Compressor Minimum On Time 5 minutes
Compressor Maximum On Time 60 minutes
DEFROST Defrost Termination Temperature 45ºF
DEFROST
Time to First Defrost (hh:mm) 8 hr
Time to subsequent Defrost 8 hr
Defrost Max Duration 30 minutes
Refrigerated Self-Serve Merchandiser (High Profile)
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