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10.2 Parameters by owners
The parameter owners are usually defined as performance, design, and operational parameters with different
organizations being responsible for each set.
PERFORMANCE
(BRAND)
Set point (SP) and differential (dIF)
Saving set point (SSP) and saving differential (Sd)
Saving restart (Sr)
DESIGN
(OEMs)
Defrost method (dF) and defrost termination method (dtF)
Defrost interval (dE) and defrost duration (dd)
defrost activation temperature (ddt) and defrost termination temperature (dtd)
defrost heater (dHr)
compressor rest time (rt)
fan cycle on (FCO) and fan cycle off (FCF)
calibration 1 (CA1) and calibration 2 (CA2)
OPERATION
(OPERATORS)
Celsius or Fahrenheit (CF)
Saving temperature disable (PEr)
Freeze-up protection (dtt)
Delay to saving mode (dS)
Learning period (LP) and activity frequency (AF)
Display (dIS) and display stability (d2)
Light delay (Ld) and marketing mode (Ar)
Fan set point (FSP)
Alarm delay (Ad), buzzer enable (b0) and buzzer duration (b1)
Refrigeration system failure (Ct)
Condenser high temperature (Ht)
10.3 Temperature setting rules
For correct operation, the parameters that define the temperatures must not create conflicting conditions. For
example, as the ems controller aims to keep the ready mode temperature between the set point (SP) temperature
and the set point (SP) plus differential (dIF) temperature, the freeze-up protection (dtt) temperature must be lower
than the set point (SP) temperature. Otherwise, the ems controller would activate freeze-up protection under
normal operating conditions. Rules for the temperature settings:
• IPd must be higher than SSP + Sd
• IPd must be higher than dtd
• dtd must be higher than SP + dIF
• SSP must be higher than SP + dIF
• dtt must be lower than SP
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