ENG
Pump down phase duration (par. dH1)
Code
Description
Def
Min
Max
UOM
User
User
terminal
dH1
Pump down phase duration
0 = pump down disabled
0
0
999
s
M
NO
The pump down phase is the period in which the evaporator is emptied of liquid refrigerant. Parameter
dH1 defines the duration of the pump down phase during all types of defrost, heater or hot gas.
Important:
the controller does not have two separate outputs to manage the compressor and
solenoid valve.
Running time defrost (par. d10, d11)
Running time is a special function that determines when the refrigeration unit needs defrosting. In
particular, it is assumed that if the evaporator temperature measured by probe Sd remains continuously
below a certain set threshold (d11) for a certain time (d10), the evaporator may be frozen and a defrost is
activated. The time is reset if the temperature returns above the threshold.
Code Description
Def Min Max UOM User
User
terminal
dt1
End defrost temperature (read by Sd)
8
-50 50 °C/°F
S
YES
dt2
End defrost temperature (read by Sd2)
8
-50 50 °C/°F
S
NO
d10
Defrost time in Running time mode
0 = function disabled
0
0
240 min
S
NO
d11
Defrost temperature threshold in Running time mode
-30 -50 50 °C/°F
S
NO
Fig.5.t
Ref.
Description
Sd
Defrost probe
DEF
Defrost
Ref.
Description
t
time
Pressure probe alarm management during defrost (par. d12)
During defrosts and dripping, so as to avoid false pressure probe error signals, errors are ignored. The
supervisor update also needs to be disabled.
Code Description
Def Min Max UOM User
User
terminal
d12
Pressure probe alarm management during defrost
probe error
supervisor update
0
disabled
enabled
1
enabled
enabled
2
disabled
disabled
3
enabled
disabled
0
0
3
-
M
NO
66
| 5. Functions
0300086EN rel. 1.0 – 04.09.2018
