and T2 temperatures or set the setup access code. The selection of the data to be displayed can take place sequentially by pressing repeatedly, or
quickly by means of buttons and to scroll through the menu. You exit from the menu by pressing or automatically after 5 seconds of no button
activation.
2.5 S
ETUP
. You have got access to the parameter menu by selecting 47 for the passcode . To achieve this press buttons and or . You exit
from the setup by pressing button or after 30 seconds of no button activation.
3. CONTROL PARAMETERS
The adaptation of the controller to the system that it controls is achieved through the parameters in the setup. The available parameters appear on TABLE
2 hereinafter.
You proceed from one parameter to the next/previous via button or . To display the related value, press button , to modify it press and
simultaneously or . You exit from the setup by pressing button or automatically after 30 seconds of no button activation.
The setpoint SP can be displayed and programmed even during the normal operation with buttons and or . The setting range however remains
within the limits SPL and SPH.
4. DISPLAYS
The temperatures measured by the 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, they can be corrected by the respective offsets OS1 and OS2 and displayed in degrees Celsius or Fahrenheit, depending on the value set
to SCL.
The air temperature, before being displayed, is treated by a special algorithm allowing the simulation of a thermal mass directly proportional to the value
set to SIM. The resulting effect is a hunting reduction on the displayed value.
The status of the compressor, evaporator fans and defrost outputs is signalled by the relevant shining dots on the display.
CAUTION: if you change SCL you must then IMPERA
TIVELY re-configure the parameters relating to the absolute temperatures (SP, DLI, FDD …) and to the
differential temperatures (HYS, ATL, ATH …).
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 programmed to HYS: if greater than 0 there will be COOLING control, if lower than 0 there will be HEATING control, if HYS=0
then the thermostat will be excluded 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 compressor cut-in is however only possible if since the off switching the minimum rest time CRT has elapsed.
5.2 In consequence to a failure of probe T1, the display shows and the output is controlled via 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=0 the timed defrost function is excluded.
Defrost can be started manually in the following way: from the “Info” menu 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 starts.
6.2 Once that defrost has been started, the outputs are controlled by the parameter DTY according to the following table:
INSTRUCTIONS FOR INSTALLATION AND USE.
SPL -40.. SPH [°] minimum temp. set ACT 0.. 250 [°] condenser alarm temperature
SPH SPL.. +250 [°] maximum temp. set CSD 0.. 30 [min] compressor safety stop delay
SP SPL.. SPH [°] actual temperature set CFT -40.. +250 [°] condenser fan temperature
HYS -30.. 0.. +30 [°] thermostat hysteresis CRT 0.. 30 [min] compressor rest time
DFR 0.. 24 defrost frequency/24h CDC 0.. 10 cooling duty cycle for T1 fault
DLI 0.. +70 [°] defrost end temperature OFF YES/NO standby button enabling
DTO 1.. 120 [min] defrost timeout DS YES/NO door switch enabling
DTY OFF/ELE/GAS defrost type LDO YES/NO door controlled lights
DRN 0.. 30 [min] drain down T2 YES/NO probe T2 enabling
DDY 0.. 60 [min] defrost display control T3 don,t modify probe T3 enabling
FPC 0.. 5 evap. fan proportional control SCL °C/°F display scale
FDD -40.. +70 [°] fan re-start temperature OS1 -15.. +15 [°] probe T1 offset
ATL -25.. 0 [°] low alarm differential OS2 -15.. +15 [°] probe T2 offset
ATH 0.. +25 [°] high alarm differential OS3 -15.. +15 [°] probe T3 offset
ATD 0.. 120 [min] temperature alarm delay SIM 0.. 100 display slowdown
ADO 0.. 120 [min] door alarm delay ADR 0.. 255 peripheral address
ACC 0.. 120 [weeks] periodic condenser cleaning
TABLE 2
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