Figure 5: Advanced Fan control
Danf
oss
80G411
Compressor cut in
Compressor cut out
Fan
Compressor
Fan ON cycle
Fan stop cycle
Fan start delay
Fan stop delay
Cabinet Air
Initial pull down
If the cabinet temperature is very high at power up, the controller detects the need for faster cooling and enters into
Initial pull down mode. In this mode, the controller adjusts the defrost interval by skipping it to a later time than its
scheduled intervals until the desired cabinet temperature is achieved.
Figure 6: Initial pull down
∆ t
Cut-in
Cut-out
0 ºC
Danf
oss
80G412
Without initial pull down, where defrost is initiated
With initial pull down
Initial pull down initiation (Pit)
Defrost terminate temp
Time saving, with ‘Initial pull down’
feature enabled
This ensures faster cooling by achieving the required cabinet temperature in the shortest period possible.
Automatic Pull down (applicable for EETa only)
This feature helps to achieve faster and extra cooling when there is an increase in the cabinet temperature due to
frequent door opening or fresh food products being placed in the cabinet. The faster and extra cooling is achieved
by adjusting the temperature set point and defrost intervals until the desired setpoint range is achieved. The
controller detects this mode by monitoring the cabinet temperature behaviour, also it is possible to trigger this
mode manually via a digital input switch.
Figure 7: Pull down/Super cool mode
Danf
oss
80G423
> 1 hr
Pdd
(pull down duration)
Pull Down Initiation (Pit)
Pull down offset temp (Pit)
Cut-in
Cut-out
Set point
(pull down initiated, when the cabinet
temp is above pit for for more than 1 hr)
© Danfoss | Climate Solutions | 2023.07
BC320944106159en-000301 | 7
Refrigeration controller, type EET series
