page 10 SERVICE MANUAL FOR PRODUCERS SBR TYPE GC201
PPUH „GECO” EDITION I PRINTOUT DATE 18-04-30
conditions for compressor activation have been met, the dot is permanently lighted and the compressor relay is
switched on.
Entering the SupeFrost mode:
- When the compressor is working (because it was just in the normal mode of the refrigerator), then the
compressor continues to work, the device is in SF and the dot is lighted continuously,
- If the compressor was turned off and the time of the compressor's minimum stoppage (parameter
"c2") has ended, the compressor is switched on, the device enters into SF mode and the dot is lighted
continuously,
- Otherwise, the display shows SF, the dot blinks and the compressor is not switched on.
Working in SF mode:
- SF lights up on the display, the dot is lighted continuously and the compressor is working until the time
defined by the "c4" parameter counted from pressing the button .
Exiting the SF mode:
- The compressor is switched off, the dot goes out and SF apears on the display until the temperature in
the device will increase to the value at which the compressor is turned off in the normal operating
mode ('Setpoint Temp' - (Hysteresis / 2 rounded to the whole number down 'd3'))
- damage to the chamber temperature sensor was found.
After fulfilling these assumptions, the word "SF" disappears and the display shows the current temperature or
A1 (if the chamber temp sensor has been damaged).
D – Hysteresis
During programming of the parameter ‘d0’ and ‘d1’ (minimal and maximal temperature which can be set by the
client) one should remember that the value of hysteresis ‘d3’ causes additional lowering or increasing of
temperature beyond the temperature sent by the user.
This is particularly important for units with plus temperatures, which should always operate above 0ºC.
Example:
As a producer of cooling equipment, e.g. of a refrigerated display case (plus temperatures) I demand that the
unit allow operation within the range of values given below: off – min: 2ºC, on - max: 10ºC.
symmetrical hysteresis for even
values of‘d3’
asymmetrical hysteresis for odd
values ‘d3’
example 1.
Hysteresis of ‘d3’ is set as 2ºC
For the above setting of the hysteresis the
parameter ‘d0’ should be set as 3ºC and ‘d1’ as 9ºC
example 3.
Hysteresis of ‘d3’ is set as 3ºC
For the above setting of the hysteresis the parameter
‘d0’ should be set as 3ºC and ‘d1’ as 8ºC
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