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MANAGING THE LOADS
5
Door frame heating
5.1
The output is present only if the load managed by output K4 is the door frame heater (u1 = 0).
This function is activated automatically when the controller is switched on or is in operation and the temperature in the
cabinet falls below the value set by parameter u5. The output is deactivated when the temperature rises above the u5
parameter +2 ºC.
If there is a cabinet probe error, the heaters are not activated, or if already on, they are deactivated.
Opening the door deactivates the heater.
Compressor
5.2
The management of the compressor varies according to the cycle activated, as specified below.
Blast chilling, blast freezing, pre-cooling, ice cream hardening, sanitation
The compressor is activated if the cabinet temperature is above the setpoint for the type of cycle underway + the
hysteresis set by parameter r0. It is deactivated when the temperature falls below the setpoint for the phase
underway.
The compressor must be switched on and off according to the safety periods set by parameters C0, C1, C2 and C3.
The drip periods must also be complied with if it is activated after a defrost cycle.
If there is a fault with the cabinet probe during a conservation cycle, the compressor is activated on a cyclical basis
according to the values of parameters C4 and C5 if this is a conservation phase following blast chilling, or according to
the values of parameters C4 and C9 for conservation following blast freezing.
Defrosting
During defrosting the compressor status depends on the value of parameter d1. If d1 equals 0, 2 or 3, the compressor
is switched off.
If d1 equals 1, the compressor will remain switched on for the entire duration of the defrost cycle and if it is switched
off when the defrost cycle is selected, it will be switched on for the period set by parameter d15 before defrosting
starts. When defrosting is finished the compressor remains off for the period set by parameter d7.
If parameter d16 is set to a value other than 0, when a hot gas defrost cycle starts the compressor remains off for the
pre-drip time set by parameter d16.
Thawing
The compressor switches on if the cabinet temperature is equal to or higher than SP+ r38 +r40, where SP is the
working setpoint based on the load band, r38 is the neutral zone relative threshold and r40 is the cabinet setpoint
differential for activating the compressor. It switches off if the cabinet temperature is equal to or lower than SP + r38.
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