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Defrost with two probes: (n - Y) n= only the dPA probe is used to defrost management; Y= defrost is managed
d2P
with dPA probe and dPb probe. Defrost can performed only if both probe value are lower than dtE for dPA
probe and dtS for dPb probe.
Defrost termination temperature (Probe A): (-67 to 122°F; -55.0 to 50.0°C) (Enabled only when the
dtE
evaporator probe is present) sets the temperature measured by the evaporator probe dPA which causes the
end of defrost.
Defrost termination temperature (Probe B): (-67 to 122°F; -55.0 to 50.0°C) (Enabled only when the
dtS
evaporator probe is present) sets the temperature measured by the evaporator probe dPb which causes the end
of defrost.
Interval between defrosts: (0 to 120h) Determines the time interval between the beginning of two defrost
IdF
cycles.
Maximum duration of defrost: (0 to 255 min) When dPA and dPb aren't present, it sets the defrost duration,
MdF
otherwise it sets the maximum duration for defrost.
Start defrost delay: (0 to 255 min) This is useful when different defrost start times are necessary to avoid
dSd
overloading the plant.
Display during defrost: rt = real temperature; it = temperature reading at the defrost start; Set = setpoint;
dFd
dEF = "dEF" label.
Defrost display time out: (0 to 255 min) Sets the maximum time between the end of defrost and the restarting
dAd
of the real room temperature display.
Drain down time: (0 to 255 min.) time interval between reaching defrost termination temperature and the
Fdt
restoring of the control's normal operation. This time allows the evaporator to eliminate water drops that
might have formed due to defrost.
dPo
First defrost after start-up: y = Immediately; n = after the IdF time
Defrost delay after continuous cycle: (0 to 23.5h) time interval between the end of the fast freezing cycle and
dAF
the following defrost related to it.
Fan probe A: (nP; P1; P2, P3, P4, P5) first probe used for fan. If FPA = nP the regulation is performed with
FPA
real value of FPB.
Fan probe B: (nP; P1; P2, P3, P4, P5) second probe used for defrost. If FPB = nP the regulation is performed
FPB
with real value of FPB.
Fan virtual probe percentage: (0 to 100%) Defines the percentage of the FPA with respect to FPb. The value
FPE
used to regulate room temperature is obtained by: value_for_defrost= (FPA*FPE + FPb*(100-FPE))/100.
Fan operating mode: C-n = running with the solenoid valve, OFF during the defrost; C-y = running with the
FnC
solenoid valve, ON during the defrost; O-n = continuous mode, OFF during the defrost; O-y = continuous
mode, ON during the defrost.
Fnd
Fan delay after defrost: (0 to 255 min) The time interval between the defrost end and evaporator fans start.
Temperature differential avoiding short cycles of fans (0°F to 90°F; 0.0°C to 50.0°C) If the difference of
FCt
temperature between the evaporator and the room probes is more than the value of the Fct parameter, the fans
are switched on.
Fan stop temperature: (-58 to 230°F; -50 to 110°C) setting of temperature, detected by evaporator probe,
FSt
above which the fan is always OFF.
Table 8-1 - XM670 to XM679 Parameters List
14 • XM679K I&O Manual
FAN
026-1218 Rev 4
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