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ir33 +030220441 - rel. 2.0 - 01.05.2006

6.13 Anti-sweat heater function

The anti-sweat heater function is used to maintain the aux1 output, conﬁ gured as the light or aux: (H1= 2, 3, 8,

9) deactivated while the control temperature (virtual probe) is less than ‘St’+‘Hdh’ when the instrument is ﬁ rst

powered up, the ‘HI’ ‘IA’ ‘dA ‘CHt’ ‘EE’ ‘EF’ ‘rE’ alarms are reset, or when switching on.

During the aforementioned alarms, the aux1 output, conﬁ gured as above, is deactivated. ‘Hdh’ represents the

offset from the set point for the anti-sweat heater function. If ‘Hdh’=0, the anti-sweat heater function is disabled.

Note: at the end of the anti-sweat heater function the outputs conﬁ gured as the light or auxiliary can be

controlled by the user using the keypad, the supervisor or the digital inputs.

If the aux1 output is conﬁ gured as light or auxiliary on power-up, it maintains the same status as prior to

shutdown. If the anti-sweat heater function is enabled, this is no longer true: on power-up, the output

remains off for the entire time that the function remains active. When the control temperature (virtual

probe) reaches the value of ‘St’+‘Hdh’, the function ends, activating the light output and the auxiliary

output, irrespective of their status prior to shutdown.

Function active Function with anti-sweat heater

Normal direct or reverse-cycle control Normal operation

Remote off, from supervisor or keypad Function restarted when switching on

Defrost Normal operation

Continuous cycle Normal operation

Temperature alarm monitoring Normal operation

Evaporator fan control Normal operation

Power on Normal operation

Normally-open or normally-closed alarm output Normal operation

Auxiliary output Normal operation

Light output Normal operation

Second evaporator output Normal operation

Control output for pump down valve Normal operation

Condenser fan control output Normal operation

Second delayed compressor output Normal operation

Auxiliary output with switch off Normal operation

Light output with switch off Normal operation

No function associated with the AUX output Normal operation

Reverse output in control with dead band Normal operation

Second compressor step output Normal operation

Second compressor step output with rotation Normal operation

Door switch with compressor, fan off and light management Normal operation

Door switch with compressor off and light management Normal operation

Curtain switch with set point variation and light management Normal operation

Light sensor and light management Normal operation

Auxiliary output activation switch Normal operation

Door switch with compressor, fan off, no light management Normal operation

Door switch with compressor off, no light management Normal operation

Light activation from keypad or supervisor Normal operation

Auxiliary activation from keypad or supervisor Normal operation

Alarms See table of alarms and signals

Virtual control probe alarm Function restarted.

Product probe alarm Normal operation

Defrost probe alarm Normal operation

Condenser probe alarm Normal operation

Antifreeze probe alarm Normal operation

Tab. 6.o

6.14 Antifreeze alarm

The antifreeze alarm is only active if a probe has been set as the antifreeze probe, /Ax = 4 (x=2-5).

ALF deﬁ nes the temperature value below which the antifreeze alarm AFr is activated, delayed by the time

set for parameter AdF. The alarm is reset manually or from the supervisor. This condition involves the

deactivation of the compressor and the activation of the alarm relay, if H1=0, 1.

Function active

Function in antifreeze