Note: Manual defrosts also end after the defrost duration (
dd
) or on reaching the defrost termination temperature (
dtd
).
For more information about the parameters used in
defrost
:
l
See "defrost duration (dd)" on page 71
l
See "defrost interval (dE)" on page 71
l
See "defrost termination temperature (dtd)" on page 73
5.6
defrost on open front coolers
Defrost cycles are timed or temperature based as defined by the defrost method (
dF
). The temperature is measured on the
evaporator sensor.
The table below describes the defrost methods.
timed-based
Time-based defrost cycles occur periodically as defined by the defrost interval (
dE
).
Time-based defrost cycles can also be initiated by pressing the defrost button. Starting a defrost cycle
manually resets the defrost interval (
dE
) timer, so the next automatic defrost cycle starts
dE
hours after
the manual defrost.
Timed-based defrost cycles end after the defrost duration (
dd
), or either on the defrost duration or on
reaching defrost termination temperature (
dtd
) as defined by the defrost termination method (
dtF
).
temperature-
based
Temperature-based defrost cycles occur when the temperature measured on the evaporator sensor falls
below the defrost activation temperature (
ddt
).
Temperature-based defrost cycles end after the defrost duration (
dd
) or on reaching the defrost ter-
mination temperature (
dtd
).
Note: Manual defrosts only work if the defrost method is time-based and the temperature measured on the evaporator
sensor is below the defrost termination temperature (
dtd
).
The diagram below shows the temperature measured on the evaporator sensor with the following defrost cycles:
1. started after the defrost interval (
dE
) and terminated after the defrost duration (
dd
) – time-based.
2. started on the defrost activation temperature (
ddt
) and terminated after the defrost duration (
dd
) – temperature-based.
3. started after the defrost interval (
dE
) and terminated on the defrost termination temperature (
dtd
) – time-based.
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