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Parameter FSt sets the fan stop temperature. This is the maximum temperature, detected by the evaporator probe, above which the

evaporator fans will stop.

Leave FSt above ambient temperature during commissioning to avoid fan short cycle.

After finishing the defrost phase, there is a stand still drain time, set by parameter Fdt. When this period has expired, the refrigeration cycle

commence but the evaporator fans remain off until Fnd (fan delay) times out.

14. SPECIAL APPLICATIONS – DEAD BAND CONTROL

14.1 DEAD BAND CONTROL (COOLING & HEATING)

With [oAC = 1], the compressor relay controls cooling as normal but the 4th (auxiliary) relay is used to control a heater. The value entered in

parameter HY will now be set equal on both sides of the SET POINT. Example: if [HY = 1°C] that will create a 2°C Dead Band.

At [SET POINT + HY], cooling switches on. At [SET POINT – HY], heating switches on. Either cooling or heating switch off when

temperature returns to SET POINT.

15. ALARMS

Message

Message – Mode Cause Outputs

EE Flashing Data or memory failure Alarm output ON; Other outputs unchanged.

Flashing Thermostat probe failure

Alarm output ON; Compressor output according to parameters Con

and CoF.

P2 Alternating with room temperature Evaporator probe failure Alarm output ON; Other outputs unchanged; End defrost is timed.

P3 Alternating with room temperature Second evaporator probe failure Alarm output ON; Other outputs unchanged; End defrost is timed.

HA Alternating with room temperature High temperature alarm Alarm output ON; Other outputs unchanged.

LA Alternating with room temperature Minimum temperature alarm Alarm output ON; Other outputs unchanged.

HA2 Alternating with room temperature Condenser max temp alarm Alarm output ON; Other outputs unchanged.

LA2 Alternating with room temperature Condenser max temp alarm Alarm output ON; Other outputs unchanged.

dA Alternating with room temperature Door open alarm Alarm output ON: Outputs re-start if parameter rrd = 1.

EA Alternating with room temperature Generic external alarm Alarm output ON; Other outputs unchanged.

bAL Alternating with room temperature Serious external alarm Alarm output ON; Other outputs OFF.

15.1 MUTING ALARM BUZZER & RELAY

The alarm buzzer can be muted, by pressing any button. The controller will briefly show the reset “rES” label. Parameter tbA defines how

the alarm relay will respond to the muting of the buzzer.

- tbA = 0: the alarm relay will remain active until the alarm condition is rectified;

- tbA = 1: the alarm relay de-activates when the buzzer is muted.

In either case, the display will flash an alarm label until the condition is rectified.

15.2 ALARM “EE”

The Dixell Universal-R is provided with an internal watchdog verifying data and memory integrity. Alarm “EE” will flash after detecting a

failure in data or in the internal memory. In this case, the alarm output is enabled.

WHAT TO DO

1. Cancel the alarm by pressing a key.

2. Check the value of all parameters and restore correct values when wrong.

3. Check the correct instrument operation and in case of further errors replace it.

15.3 ALARM RECOVERY

Probe alarms “P1”, “P2” and “P3” start 30 seconds after a fault in probe is detected; they automatically stop 30 seconds after the probe

restarts normal operation. Check connections before replacing the probe.

Temperature alarms “HA” and “LA” automatically stop as soon as the thermostat temperature returns to normal values and when defrost

starts. Temperature alarms “HA2” and “LA2” automatically stop as soon as the condenser temperature returns to normal values.

16. REMOVING SECURITY LEVEL PROTECTION

It is possible to allow access to any parameter from Pr1 level. To do this, go into Pr2 as previously described. Scroll to the label of the

parameter you require and then press the SET and DOWN buttons in quick succession. The decimal point LED will be on indicating that

access to this particular parameter is now possible from Pr1 level. Its label will now appear when in Pr1 programming level and its value can

be altered. To restore security level protection, use the same procedure (the decimal point LED will go out after pressing both buttons).

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Emerson Universal-R Manuel de service Page 17

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