5.3 Defrost
Introduction
Parameters td1 to td8 can be used to set up to 8 defrost events based on the controller clock (RTC) and
to activate the Power Defrost (see the end of the paragraph).
To set parameters td1 to td8, use the supervisor or the "Applica" app.
Code Description Def Min Max UOM User
User
terminal
td1..8-d
Defrost 1 to 8 - day
0 = event disabled
1 to 7 = Monday to Sunday
8 = from Monday to Friday
9 = from Monday to Saturday
10 = Saturday & Sunday
11 = every day
0 0 11 day S NO
td1..8- h Defrost 1 to 8 - hours 0 0 23 hours S NO
td1..8-n Defrost 1 to 8 - minutes 0 0 59 minutes S NO
td1..8-P
Defrost 1 to 8 - enable power defrost:
0/1 = normal/power defrost
0 0 1 - S NO
MPXone can manage the following types of defrost, depending on the setting of parameter d0:
l heater, placed near the evaporator;
The defrost can end by temperature, in which case the defrost probe Sd must be installed, or by time. In
the first case the defrost ends when the defrost probe Sd exceeds the end defrost value dt1 or the time
dP1 has elapsed, in the second case when the defrost phase exceeds the maximum time dP1. At the end
of the defrost the dripping phase may begin (if dd>0), during which the solenoid valve is closed and the
fans are off, followed by the post-dripping phase (if Fd>0), during which control resumes and the fans
work based on the setting of par. Fpd. The type of display on user terminal and the remote display
during the defrost can be selected by setting parameter d6.
Note: high temperature alarms can be disabled after defrosting by setting par. d8
Code Description Def Min Max UOM User
User
terminal
d0
Type of defrost
0 = heater by temperature
1 = reserved
2 = heater by time
3 = reserved
4 = heater by time with temperature control
0 0 4 - S YES
dt1 End defrost temperature (read by Sd) 8 -50 50 °C/°F S YES
dP1 Maximum defrost duration 45 1 240 min S YES
d6
Display on terminals during defrost
0 = temperature alternating with ‘dEF’
1 = freeze display
2 = ‘dEF’
1 0 2 - U NO
d8 Bypass high temperature alarm time after defrost 30 1 240 min S NO
F3
Evaporator fans during defrost
0/1 = on/off
1 0 1 - S NO
Fd Post-dripping time after defrost (fans off with control active) 1 0 15 min S NO
Fpd
Evaporator fans during post-dripping
0/1 = On/Off
0 0 1 - 0 NO
Below is the trend of the defrost output based on the setting of parameter d0.
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