Special Applications – Dead Band Control; Removing Security Level Protection - Emerson Universal-R Installing And Operating Instructions

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
EE Flashing
P1
Flashing
P2 Alternating with room temperature
P3 Alternating with room temperature
HA Alternating with room temperature
LA Alternating with room temperature
HA2 Alternating with room temperature
LA2 Alternating with room temperature
dA Alternating with room temperature
EA Alternating with room temperature
bAL Alternating with room temperature
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).
1592031000 Univ-R4 GB - r1.1 - 2012.07.23
Cause
Data or memory failure
Thermostat probe failure
Evaporator probe failure
Second evaporator probe failure
High temperature alarm
Minimum temperature alarm
Condenser max temp alarm
Condenser max temp alarm
Door open alarm
Generic external alarm
Serious external alarm
Universal-R
Outputs
Alarm output ON; Other outputs unchanged.
Alarm output ON; Compressor output according to parameters Con
and CoF.
Alarm output ON; Other outputs unchanged; End defrost is timed.
Alarm output ON; Other outputs unchanged; End defrost is timed.
Alarm output ON; Other outputs unchanged.
Alarm output ON; Other outputs unchanged.
Alarm output ON; Other outputs unchanged.
Alarm output ON; Other outputs unchanged.
Alarm output ON: Outputs re-start if parameter rrd = 1.
Alarm output ON; Other outputs unchanged.
Alarm output ON; Other outputs OFF.
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