OSAKA - USER MANUAL - B4U - v2 - PAG. 10
If the system is configured correctly, it is possible to avoid many
UNNECESSARY defrosts and consequently Energy Savings and
Efficiency.
Through the parameter - "dd" - PERCENTAGE OF TIME
REDUCTION FOR DEFROST. It is possible to set the percentage of
time reduction in which the B4U reduces the times between defrosts
if the system conditions require it.
Setting the parameter "dd" = 100% to the first increase in the stored
temperature difference (greater than 1 ° C) between the chamber
(Pr1) and the evaporator probe (EP), the defrost starts immediately.
For correct operation, the B4U needs a first reference value between
the temperature difference of the chamber and the evaporator, in this
way, all the variations in the active Set Point, in the differential “rd” or
in a defrost execution , eliminate this first reference value and any
reduction could not be made until the acquisition of a new reference
value.
Operation example "dynamic interval defrost system" with reduction
"dd" = 40% and end of defrost by temperature.
- Defrost by evaporator temperature.
The B4U activates a defrost cycle when the evaporator temperature
(EP probe) falls below the temperature set in parameter “tF” and
when the time set in parameter “St” has elapsed to guarantee a
defrost when the evaporator reaches a very low temperature which
is usually a symptom of low heat exchange compared to normal
operating conditions.
When “tF” = oF the function will be disabled.
- Defrost due to continuous compressor operation time.
The B4U activates a defrost cycle when the compressor is activated
continuously for time “cd”.
This function is used for the continuous operation of the compressor
for a long period of time which is usually a symptom. of a low
exchange caused by ice on the evaporator.
Programming "cd" = oFthe function will be disabled.
4.8.2 - MANUAL DEFROST
To start a manual defrost cycle, keep the UP / DEFROST key
pressed for about 5 seconds, if the conditions are correct, the DEF
LED will light up and the B4U will carry out a defrost cycle.
To interrupt a defrost cycle in progress, press and hold the UP /
DEFROST key for about 5 seconds.
4.8.3 - DEFROST END
The duration of the defrost cycle can be by time or, if the evaporator
probe is used (Pr2 probe configured as EP), by temperature range.
If the evaporator probe is not used, the cycle duration is set in the
"dE" parameter (by programming "dE" = oF, the interval or manual
defrosts will be disabled).
On the other hand, if the evaporator probe is used, the end of the
defrost occurs when the temperature measured by this probe set as
EP exceeds the temperature set in parameter "tE".
If this temperature is not reached within the time set in parameter
“dE”, the defrost will be interrupted.
To avoid unnecessary defrosting when the evaporator temperature
is high, the "tS" parameter allows setting the temperature referring to
the evaporator probe below which the defrosts will be activated.
Therefore, in the indicated modes, if the temperature measured by
the evaporator probe (EP) is higher than that set in the "tS" parameter
and also in the "tE" parameter, defrosts are prevented.
Examples of completion of defrost:
The defrost shown as A ends when it reaches the temperature "tE".
Defrost B ends when time "dE" ends because it does not reach
temperature "tE". And defrost C is not activated since the
temperature is higher than "tS".
Example of electric defrost with temperature control of the
evaporator:
The defrost ends at the expiration of time "dE". During defrost, the
output configured as “dF” is activated / deactivated as an ON / OFF
temperature controller in a heating function with hysteresis of 1º in
order to keep the defrost temperature constant at the value
programmed in “tE”.
The active defrost is shown on the display when the DEF LED lights
up.
At the end of defrost, it is possible to delay the start-up of the new
compressor (output "ot") for the time set in parameter "td" to allow the
evaporator to drain.
During this delay, the DEF led blinks to indicate the drain status.
5.8.4 - DEFROST INTERVALS AND DURATION IN CASE OF
EVAPORATOR PROBE ERROR
In the event of an evaporator probe error, defrosts will be done with
"Ei" intervals and with "EE" duration.
In the event that a probe error occurs during the time remaining for a
defrost or for a defrost to end, the start or end will occur with respect
to the shortest time programmed in the parameter relative to probe
error conditions.
These functions are available when the evaporator probes are used,
the duration of the defrosts is normally done by programming a time
longer than normal as safety (the measured temperature value of the
probe offers to finish the first defrost) and, in the If the "Defrost by
Dynamic Intervals" function is used, the interval between defrosts is
normally programmed with a time greater than the normal time that
is normally programmed in the equipment that does not have the
function.
5.8.5 - DEFROST SCREEN LOCK
Using the "dL" and "dA" parameters, the behavior of the display is set
during a defrost.
The "dL" parameter allows blocking the display of the display in the
last temperature measurement of the Pr1 probe ("dL" = on) during
the defrost and until the end of the defrost and the Pr1 temperature
has not returned to the value of the last reading , or to the value ["SP"
+ "d"]) or when the time programmed in parameter "dA.
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