ASCON TECNOLOGIC - Y39E
- OPERATING INSTRUCTIONS - Vr. Mondial Group - 10/10 - ISTR-MY39EENGmondial - PAG. 7
Pr1
Temp.
time
EP
SP
r.d
off
ON
Cool
(ot)
SP+r.d
DT0
DT1
1 °
DT2
DT3
ON
ON
ON
off
off
d.tE
d.di / d.Sd
Defrost
(dF)
Phase
0
1
2
3
time to defrost Ph. 0, 1
time to defrost Ph. 2
time to defrost Ph. 3
Defrost
d.tS
esempio funzionamento “dynamic defrost intervals system”
con
riduzione “d.dd” = 40 % e fine sbrinamento per temperatura.
By par.
: “d.dd”
- DEFROST INTERVAL PERCENTAGE
REDUCTION is possible to establish the percentage of reduction of
the remaining time to start defrost when the conditions for the
reduction happen.
If par. "d.dd" = 100% at the first increase of the memorized
difference of temperature between cell (Pr1) and evaporator (> 1 °)
a defrost start immediately
For correct functioning the instrument needs a first reference value
of the temperature difference between cell and evaporator.
Every variation of the value of the Active Set Point, of the
differential "r.d", the start of a continuous cycle or the a defrost
execution delete this reference value and any reduction will be
performed until the acquisition of a new reference value.
Defrost by temperature evaporator
The instrument starts a defrost cycle when the temperature
evaporator (“EP” probe) goes below the
“d.tF”
programmed
temperature for
“d.St”
programmed time.
This system can be used in heat pump defrost system (in this case
the defrosting intervals are usually disabled) or to guarantee a
defrost if the evaporator reaches very low temperatures that
normally result symptomatic of a bad thermal exchange in
comparison to the normal working conditions.
If “d.tF” = -99.9 the function is disable.
Defrost by continuous compressor running time
The instrument start a defrost cycle when the compressor is turned
on continuously for the time
"d.Cd”.
This function is used because the continuous operation of the
compressor for an extended period is usually symptomatic of a bad
thermal exchange in comparison to the normal working conditions.
If "d.Cd" = oF the function is disabled.
4.8.2- MANUAL DEFROST
To start up a manual defrosting cycle, press the key UP/DEFROST
when it is not in programming mode and keep it pressed for about 5
seconds after which, if the conditions are correct, the led Defrost
will light up and the instrument will carry out a defrosting cycle.
To stop a defrosting cycle, press the key UP/DEFROST during a
defrost cycle and keep it pressed for about 5 sec.
4.8.3 - DEFROST ENDS
The automatic defrosting cycle can be ended by time or, if an
evaporator probe is used (“EP” probe), when a temperature on the
evaporator is reached.
If the evaporator probe is not used the duration cycle is set by the
parameter
“d.dE”.
If instead the evaporator probe is used the defrost cycle end when
the temperature measured by the evaporator probe exceeds the
temperature set in the parameter
“d.tE”.
If this temperature is not reached in the time set in the parameter
“d.dE”, defrosting is interrupted.
If the temperature measured by the probe is higher than the
temperature set in the parameter "d.tE" the defrosting is inhibited.
The active defrost is shown on the instrument display with the
lighting up of the DEFROST led
At the end of defrosting, it is possible to delay the new start up of
the compressor (output “ot”) at the time set in parameter
“d.td”
to
allow the evaporator to drain.
During this delay, the led Defrost flashes to indicate the draining
state.
d.di
Temp.
dF
d.di/d.Sd
off
d.tE
ON
A
off
EP
d.di
ON
d.dE
B
(NO defrost)
d.di
off
C
time
Examples:
defrosting A ends due to reaching of temperature “dtE”,
defrosting B ends at the end of the “d.dE” time as the temperature
“d.tE” is not reached, defrosting C does not take place as the
temperature is higher than “d.tE”.
4.8.4
-
DEFROSTS IN EVENT OF EVAPORATOR PROBE ERROR
In event of evaporator probe error the defrosts occur at intervals
"d.Ei"
and duration
"d.EE”.
In case an error occurs when the time remaining to the start or the
end of defrost it’s lower than that normally set the parameters
related to error conditions probe, the start or the end take place
with the shortest time.
The functions are provided because when the evaporator probe is
used the defrost endurance time is usually set longer than
necessary (the time “d.dE” is a security time-out) and in case is
used the "Dynamic Intervals Defrost System” the interval is usually
set more longer than what is normally programmed into instruments
that do not have the function.
4.8.5 - DEFROST DISPLAY LOCK
Through par.
“d.dL”
and
“A.dA”
it’s possible to define the display
behaviour during defrost.
The “d.dL” parameter pemits the display visualization lock on the
last Pr1 emperature reading (“d.dL” = on) during all the defrost
cycle until, at the end of defrost, the temperature has not reached
the lock value or the value [”SP” + “r.d”] or is elapsed the time
setted on par. "A.dA".
Or it permits only the visualization of label
“dEF”
(“d.dL” = Lb)
during the defrost cycle and, after the defrost, of label
“PdF”
until,
at the end of defrost, the Pr1 temperature has not reached the lock
value or the value [”SP” + “r.d”] or is elapsed the time setted on par.
"A.dA".
The display will otherwise (“d.dL”= oF) continue to visualize the Pr1
temperature measured by the probe during the defrost cycle.
4.9 - EVAPORATOR FANS CONTROL
The control of the fans on the output configured as “Fn” depending
on determined control statuses of the instrument and the
temperature measured by the evaporator probe (EP).
In the case that the evaporator probe is not used or in error , the
output Fn is activated only depending on the parameters “F.tn”,
“F.tF” and “F.FE”.
The parameters
“F.tn”
e
“F.tF”
decides the funs functioning when
the output configured as “ot” (compressor) is off.
When output “ot” is off , it is possible to set the instrument so that
that the output “Fn”continues to work in cycles according to the
times programmed in the parameter
“F.tn”
(fan activation time)
and
“F.tF”
(fan deactivation time).
When output “ot” is switched off the instrument activates the output
“Fn for the time “F.tn”, then deactivates it for the time “F.tF” and so
on whilst the otuput “ot” remains off.
