Anti-Sweat Heaters - Emerson XM670K Installing And Operating Instructions

An additional parameter FSt provides the setting of the temperature, detected by the evaporator probe, above which the fans
are always OFF. This can be used to verify that air is circulated only if this temperature is lower than set in the FSt.
12.7.2. Control With Analog Output (If Present)
The regulation probe is set in the parameter FAP.
NOTE: to use properly this function FAP has to be set as the thermostat probe.

12.8. Anti-Sweat Heaters

Anti-sweat heater regulation can be performed with the on board relay (if OA6 = AC) or with the analog output (if present by
setting trA = AC). However, the regulation can be performed in two ways:
• Without real dewpoint information: in this case the default value for dewpoint is used (SdP parameter).
• Receiving dewpoint from XWEB5000 system: the SdP parameter is overwritten when a valid value for dewpoint is
received from XWEB. In case the XWEB link is lost, SdP is the value that will be used for safety.
The best performance can be obtained using probe 4. In this case, the regulation follows the chart illustrated in Figure 12-2:
Probe 4 should be placed on the showcase glass. For each cabinet, only one probe 4 (P4) can be used; the P4 will send its value
to the other sections that are connected to the LAN.
Document Part # 026-4280 Rev 1
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The modulating output [trA = rEG] works in a proportional
manner (excluding the first AMt seconds where the fans
speed is the maximum; 10 seconds is the minimum value).
The regulation setpoint is relative to the regulation setpoint
and is indicated by ASr, the proportional band is always
located above the [SET + ASr] value and its value is PbA. The
fans are at minimum speed AMi when the temperature read
by the fan probe is [SET + ASr] and the fan is at maximum
speed (AMA) when the temperature is [SET + ASr + PbA].
Figure 12-1 - Control With Analog Output
Figure 12-2 - Anti-Sweat Heaters
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