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Probe value At 4mA or At 0V: (-1.0 to P20 bar / -14 to PSI / -10 to P20 kPA*10) pressure value measured by
PA4
probe at 4mA or at 0V (related to PrM parameter) Referred to Pb5
Probe value 20mA or At 5V: (PA4 to 50.0 bar / 725 psi / 500 kPA*10) pressure value measured by probe at
P20
20mA or at 5V (related to PrM parameter) Referred to Pb5
Lower Pressure Limit for superheat regulation: (PA4 to P20 bar / psi / kPA*10) when suction pressure comes
LPL
down to LPL the regulation is performed with a LPL fixed value for pressure, when pressure comes back to
LPL the normal pressure value is used. (related to PrM parameter)
Maximum Operating Pressure threshold: (PA4 to P20 bar / psi / kPA*10) if suction pressure exceeds
MOP
maximum operating pressure value, device signals situation with MOP alarm. (related to PrM parameter)
Lowest Operating Pressure threshold: (PA4 to P20 bar / psi / kPA*10) If the suction pressure comes down to
LOP
this value, a low pressure alarm is signaled with LOP alarm. (related to PrM parameter)
delta MOP-LOP: (0 to 100%) When a MOP alarm occurs, the valve will close of the dML percentage every
dML
cycle period until MOP alarm is active. When LOP occurs, the valve will open of the dML percentage every
cycle period until LOP alarm is active.
Maximum Superheat alarm: (LSH to 144°F / LSH to 80.0°C) When the superheat exceeds this value, a high
MSH
superheat alarm is signaled after interval SHd.
Lowest Superheat alarm: (0 to MSH °F / 0.0 to MSH °C) When the superheat goes down to this value, a low
LSH
superheat alarm is signaled after interval SHd.
SHy
Superheat alarm Hysteresis: (1 to 45°F / 0.1 to 25.5°C) Hysteresis for superheat alarm deactivation.
Superheat alarm activation delay: (0.0 to 42.0 min: resolution 10s) When a superheat alarm occurs, the time
SHd
SHd have to pass before signaling the alarm.
Fast-recovery Constant: (0 to 100 s) permits to increase integral time when SH is below the setpoint. If FrC=0
FrC
fast recovery function is disabled.
defrost Probe A: (nP; P1; P2, P3, P4, P5) first probe used for defrost. If rPA = nP the regulation is performed
dPA
with real value of dPb.
defrost Probe B: (nP; P1; P2, P3, P4, P5) second probe used for defrost. If rPB = nP the regulation is
dPb
performed with real value of dPA.
defrost virtual probe percentage: (0 to 100%) it defines the percentage of the dPA respect to dPb. The value
dPE
used to regulate room temperature is obtained by: value_for_defrost= (dPA*dPE + dPb*(100-dPE))/100.
tdF
Defrost type: (EL - in) EL = electrical heater; in = hot gas.
EdF
Defrost mode: (in) In= interval defrost activation with idf.
Heater setpoint during defrost: (-67 to 302°F; -55.0 to 150.0°C) if tdF=EL during the defrost the defrost relay
Srt
perform an ON/OFF regulation with Srt as setpoint.
Hyr
Differential for heater: (1°F to 45°F, 0.1°C to 25.5°C) the differential for heater
Time out for heater: 0 to 255 (min.) if the defrost probe temperature is bigger than Srt for all tod time the
tod
defrost ends although the defrost probe temperature is lower than dtE or dtS. It permits to reduce defrost
duration.
Minimum temperature difference to start defrost: [1°F to 90°F] [0.1°C to 50.0°C] if the difference between
dtP
the two defrost probes stays lower than dtP for all ddP time the defrost is activated.
ddP
Delay before starting defrost (related to dtP): (0 to 60 min) delay related to dtP.
Table 8-1 - XM670 to XM679 Parameters List
Auxiliary Output
DEFROST
Parameters List • 13
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