Figure 20: Synchronized Defrost; Figure 21: Pack Defrost Compressor Delay At Hot Gas Defrost - Emerson ECB-D20 Technical Information

81 Fan restart temperature threshold after defrost
After an electrical or hot-gas defrost the fans are started again if the temperature of the sensor selected in
drops below the level configured in this parameter.
82 Sync. Delay after defrost
Maximum idle time the device is waiting for other cabinets to finish defrost. In any case after that time cooling
is started again. This is done to prevent one device blocking the whole group in case of an error.
"Synchronized defrost"
Start of defrost cylce
Set interval timer to defrost interval
Duration of defrost phase variable
Max. time defined by parameter: Defrost time limit
(daytime or nighttime operation)

Figure 20: Synchronized Defrost

83 Password for display
The display password is set by this parameter.
84 Variable speed startup duration
When switching on the variable speed out of Off state the compressor first run on a constant speed defined by
Parameter 85 Variable speed startup speed
85 Variable speed startup speed
When switching on the variable speed out of Off state the compressor first run on the speed defined by this
parameter.
86 Pack remove capacity delay
If a pack controller is used, stopping the next compressor (reduce power) could be delayed by this parameter.
87 Pack add capacity delay
If a pack controller is used, starting the next compressor (increase power) could be delayed by this parameter.
88 Pack compressor selection
Two modes could be selected for pack control:
• rotating: the next compressor which will be added is the one with lowest run time
• base load: compressor 1 is used as a base load. Compressor 2 and 3 are chosen by run time.
89 Pack defrost compressor delay
Comp 1
OFF
Comp 2
OFF
Comp 3
OFF

Figure 21: Pack Defrost Compressor Delay at Hot Gas Defrost

If a hot-gas 4-way defrost is configured the adding of additional compressors in defrost mode could be delayed
by this parameter.
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Technical Information
. This parameter defines the duration of this startup phase.
ON
Cfg_89
ON
Cfg_89
ON
End of defrost cycle
Waiting for other
End of defrost cylce
equipment
Duration of drain
Max. idle time for
phase defined by
other cabinets to
parameter: Draining
finish defined in
delay
cfg 82
Normal operation
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