"
Pdi
"
Min. 0 hour
Max. 48 hour
Default 15 hour
Pull Down Defrost Interval
This is the time between defrost cycles during pull down. It is measured in hours and can be up to 48 hours.
During pull down, this setting overrides the defrost interval and defrost time settings (see the defrost section).
"
Pdd
"
Min. 0 hour
Max. 48 hour
Default 24 hour
Pull Down Duration
Maximum time for pull down. If time expires pull down will stop, regardless of temperature.
"
PLt
"
Min. -55.0°C
Max. 55.0°C
Default 0.0°C
Pull Down Limit Temperature
This parameter sets the minimum allowed temperature during pull-down.
In order to protect valuable contents you must always specify the absolute
minimum temperature allowed in your application.
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)
"
Prt
"
Min. 0.0 K
Max. 10.0 K
Default 0.1 K
Pull Down Reduction Temperature Δt
The controller calculates a lower set point during pull down mode to
increase the cooling 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
".
dEF
Defrost settings
"
dFt
"
Default no
Defrost Type
"
no
": defrost function is disabled.
"
EL
": electrical defrost.
"
Hgd
": hot gas defrost (contact Danfoss for details).
"
nat
": OFF-cycle defrost (natural defrost).
"
Add
"
Min. no
Max. yes
Default no
Adaptive defrost
"
no
": defrost controlled by time.
"
yES
": automatic defrost control activated.
"
dtt
"
Min. 0.0°C
Max. 25.0°C
Default 6.0°C
Terminate Temperature
This parameter defines at what temperature the defrost cycle will stop.
The temperature is given by the evaporator sensor or by the cabinet temperature sensor if no evaporator sensor is used.
"
drt
"
Min. 0.0°C
Max. 200.0°C
Default 5.0°C
Defrost reset temperature
The defrost counter is saved and restored at power-up, but if the temperature sensor, used for defrost, is higher than this
value at power-up, it is assumed that the evaporator is free of ice and the defrost counter will be cleared.
"
dii
"
Min. 1 hour
Max. 96 hour
Default 6 hour
Defrost minimum Interval/dii
Defines the minimum time period between the start of two defrost cycles. This parameter is applicable only in Adaptive defrost
mode.
Once the minimum interval has expired, controller will monitor the evaporator temperature and it will start the defrost if evapo-
rator temperature goes below "dEt" or "ddt" value. If not, it will trigger the defrost once the maximum interval "dAi" has been
reached.
In case of time based defrost it always trigger the defrost at Maximum interval"dAi".
"
dAi
"
Min. 1 hour
Max. 96 hour
Default 7 hour
Maximum Interval
Defines the maximum time period between the start of two defrost cycles.
"
dit
"
Min. 0 min
Max. 240 min
Default 5 min
Minimum Time
Defines the minimum duration of a defrost cycle. During this period, the controller will not check the temperature. Once the
minimum time has expired, the temperature will be checked and if the terminate temperature "
dtt
" has been reached, the defrost
cycle will end. If dtt has not been reached, defrost will continue until either dtt is reached or the maximum time "
dAt
" reached,
whichever occurs first.
"
dAt
"
Min. 0 min
Max. 480 min
Default 30 min
Maximum Time
Defines the maximum duration of a defrost cycle.
The controller will not allow a maximum time to be entered which is less than the minimum time, or a minimum time which is
more than the maximum time.
User Guide | ERC 112 Refrigeration Controller
12 | BC200686422115en-000802
© Danfoss | DCS (vt) | 2019.07