Document Part # 026-4280 Rev 1
Page 16 of 33
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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.
Figure 12-1 - Control With Analog Output
Figure 12-2 - Anti-Sweat Heaters
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
].