Pull Down - Danfoss ERC 102 Reference Manual

1 Click: Temperature setpoint
Sub function: Up
Pull Down Initiate Temperature / Pit
This parameter indicates the temperature which causes a pull down to start . If the
temperature measured inside the cabinet exceeds this value for longer than one
hour, then pull down will start . The compressor will have already cut-in, so the only
1 Click: Temperature setpoint
Sub function: Up
effect is to stop defrost cycles until the desired temperature is reached . The period
of one hour is fixed and cannot be altered .
1 Click: Temperature setpoint
Pull Down Cycling / PCy
Sub function: Down
This is the duration in minutes of the compressor cycling at the reduced set point
temperature . Once the desired Pull Down Limit Temperature PLt has been reached
during Pulldown, the compressor will continue to cycle on / off for the duration of
1 Click: Temperature setpoint
Sub function: Up
PCy . At the end of the period defined by PCy, the Set Point temperature will return
to normal and Pulldown will cease .
1 Click: Temperature setpoint
Pull Down Defrost Interval / Pdi
Sub function: Down
Even though most applications do not need Defrost during Pull Down, an extended
defrost during pull down can be applied . This is the time between defrost cycles
during Pull Down . It is measured in hours and can be up to 48 hours . During Pull
1 Click: Temperature setpoint
Down, this setting overrides the Defrost Interval and Defrost Time settings (see the
Sub function: Up
Defrost section) .
1 Click: Temperature setpoint
Pull Down Duration / Pdd
Sub function: Down
You can choose to limit the maximum Pull Down time . Once this time value
1 Click: Temperature setpoint
(max . 48 hours) is reached, Pull Down will stop regardless of whether the desired
Sub function: Up
pull-down temperature has been reached .
Pull Down Limit Temperature / PLt
This parameter sets the minimum allowed temperature during pull-down,
1 Click: Temperature setpoint
Sub function: Down
In order to protect valuable contents you must always specify the absolute mini-
mum temperature allowed in your application .
1 Click: Temperature setpoint
Sub function: Up
For Glass Door Merchandisers 0°C/32°F protects bottles from freezing;
for Commercial Fridges you may opt for a slightly higher temperature (e .g . 2°C)
1 Click: Temperature setpoint
Pull Down Reduction Temperature Δt / Prt
Sub function: Down
ERC 102 calculates a lower set-point during Pull Down mode to increase the cool-
ing capacity of your appliance . For each hour the cabinet temperature is above the
Pull down initiate temperature, the set-point is reduced with the value of Prt .
1 Click: Temperature setpoint
Sub function: Down
ERC 102 Reference manual – 7 PARAMETERS 37