button
and at the same time
or . The exit from the setup takes place automatically after 30 seconds of no button activation or immediately by pressing
button .
The setpoint SP can be displayed and set also during the normal operation status with
and
or
buttons. The setting range however remains within the
limits established with
SPL
and
SPH
.
Table 2
4. DISPLAYS
The temperatures measured by probes T1 and T2 are treated by the microprocessor in such a way as to display them in the most meaningful way. To achieve
this, the temperatures can then be corrected by the respective offsets
OS1
and
OS2
and displayed in degrees Celsius or Fahrenheit, depending on the value
set to
SCL
.
Caution:
if you change the readout scale you must then IMPERATIVELY re-configure the parameters relating to the absolute temperatures (SP, DLI, FDR …) and
to the differential temperatures (HYS, ATL, ATH …).
The air temperature, offset by OS1, before being displayed is treated by a special algorithm allowing the simulation of a thermal mass directly propotional to
the value set to
SIM
. The resulting effect is a hunting reduction on the displayed value.
By setting
DDY
to values greater than 0, during defrost, instead of the temperature, the display shows DEF, which will remain beyond defrost end for the number
of programmed minutes.
5. THERMOSTAT FUNCTION
5.1
Temperature control is based upon the comparison between temperature T1, the setpoint
SP
and the hysteresis
HYS
. The thermostat operation is
determined by the value set to HYS: if greater than 0 there will be COOLING control, if lower than 0 there will be HEATING control, if equal to 0, the thermostat
will be excluded and the corresponding output will be switched off permanently.
Example 1: HYS 02, SP -20; relay Off with T1 -20° and On with T1 -18°.
Example 2: HYS –04, SP 70; relay Off with T1 +70° and On with T1 +66°.
The actual relay on switching is however only possible if since the off switching the minimum rest time
CRT
has elapsed.
The relay status is signalled by the relevant dot on the display.
5.2
In consequence to failure of probe T1, the display shows ERR and the output is controlled with a fixed time established by
CDC
. This determines the output
running time within 10 minute cycles.
Example: CDC 06, 6 minutes On, 4 minutes Off.
6. DEFROST
6.1
Defrost automatically starts every time the built-in timer matches the time necessary to obtain the defrost frequency determined with
DFR
. For example,
with DFR=4 there will be a defrost every 6 hours. With DFR set to 0, the timed defrost function is excluded.
Defrost can be started manually from the Info menu in the following way: select DF, press button
first then
simultaneously.
The built-in timer is set to zero every time the unit is switched on (power supply or standby) and every time defrost is started.
6.2
Once that defrost has been started, the outputs are controlled by the parameter
DTY
according to the following table:
6.3
Defrost terminates either when time
DTO
elapses or, if the evaporator probe is active (
T2
=YES), when temperature
DLI
is measured.
Now, if
DRN
is greater than 0, before cooling starts, all the outputs remain off for the time set to DRN. This phase, called drain down, will allow a complete
ice melting and the drain of the resulting water.
INSTRUCTIONS FOR INSTALLATION AND USE.
SPL
-40.. SPH [°]
minimum temp. set
ATD
0.. 120 [min]
temperature alarm delay
SPH
SPL.. +250 [°]
maximum temp. set
ADD
0.. 120 [min]
door alarm delay
SP
SPL.. SPH [°]
actual temperature set
ACL
0.. 120 [weeks]
condenser clean interval
HYS
-30.. 0.. +30 [°]
thermostat hysteresis
CRT
0.. 30 [min]
compressor rest time
DFR
0.. 24
defrost frequency/24h
CDC
0.. 10
compressor duty cycle
DLI
0.. +70 [°]
defrost end temperature
OFF
YES/NO
standby key enable
DTO
1.. 120 [min]
defrost timeout
DS
YES/NO
door switch enable
DTY
OFF/ELE/GAS
defrost type
LDC
YES/NO
door switched light
DRN
0.. 30 [min]
drain down
T2
YES/NO
probe 2 enable
DDY
0.. 60 [min]
defrost display control
SCL
°C/°F
display scale
FRC
0.. 5
fan run control
OS1
-15.. +15 [°]
probe 1 offset
FDR
-40.. +70 [°]
fan re-start temperature
OS2
-15.. +15 [°]
probe 2 offset
ATL
-25.. 0 [°]
low alarm differential
SIM
0.. 100
display slowdown
ATH
0.. +25 [°]
high alarm differential
ADR
0.. 255
address
DTY
D
EFROST
C
OMPRESSOR
F
ANS
OFF
off
off
on
ELE
on
off
off
GAS
on
on
off
