3516526A02 Ed. 01
25
Control of defrost in SELFDRIVE mode (CE=1)
Defrosts in SELFDRIVE mode are not programmed, but rather the device evaluates the operation of the cold room and
manages defrosts depending on the needs of the installation.
If a drop in the performance of the cold room is detected due to formation of ice in the evaporator, defrost is activated
and it is supervised until its completion.
Using parameter d30, the defrost strategy is defined, a lower value allows less formation of frost in the evaporator,
while a higher value acts with lower frequency allowing more frost to accumulate in the evaporator.
As a rule, a more aggressive strategy provides the system with greater efficiency allowing more frost to accumulate.
Adapting the value of this parameter to the type of evaporator used and to the type of defrost configured according
to the following table is recommended:
TYPE OF DEFROST
ELECTRIC
AIR
HOT GAS
H
HH
HHH
H
HH
HHH
H
HH
HHH
Fin spacing of the evapor
ator in mm
<3
0
1
2
1
3
4
0
1
2
3.5
0
1
2
1
3
4
0
1
2
4
1
2
3
2
4
5
0
1
2
4.5
2
3
4
3
5
6
1
2
3
5
2
3
5
3
5
7
1
2
3
5.5
2
3
5
3
5
7
1
2
4
6
3
4
6
4
6
8
1
3
4
6.5
3
4
6
4
6
8
1
3
4
7
4
5
7
4
7
9
2
3
4
7.5
4
6
7
5
8
9
2
3
4
8
4
6
8
5
8
10
3
4
5
8.5
5
7
8
6
9
10
3
4
5
9
5
7
8
6
9
10
4
5
6
9.5
5
8
9
6
10
10
4
5
6
10
6
8
9
7
10
10
4
5
6
10.5
6
8
10
7
10
10
4
5
6
>11
6
9
10
7
10
10
4
5
6
Strategy:
H
Conservative
HH
Moderate
HHH
Aggressive
Parameter d31 allows establishing a time limit without making defrosts, if the cold room does not require defrosts
set it to 0, if the cold room can generate frost it is recommended to set a security time of between 2 and 7 days.
Parameter d32 defines the maximum time permitted of the cold room without reaching the Set Point, after which an
emergency defrost starts to unlock the evaporator.
Parameter d4 defines the final defrost temperature.
It is advisable to configure all the parameters relating to defrost since, in the event of a calibration or
operating error of the SELFDRIVE mode, the controller then temporarily regulates in standard mode.
Summary of Contents for 16526A
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