Technical data

12 • XM670K-XM679K I&O Manual 026-1218 Rev 0 19-DEC-2012
red
Remote display: (nP; P1; P2, P3, P4, P5, P6, tEr, dEF) it selects which probe is displayed by the X-REP. P1,
P2, P3, P4, P5, P6, tEr= virtual probe for thermostat, dEF= virtual probe for defrost.
dLy
Display delay: (0 to 24.0 m; resolution 10s) when the temperature increases, the display is updated of 1 °C/
1°F after this time.
rPA
Regulation probe A: (nP; P1; P2, P3, P4, P5) first probe used to regulate room temperature. If rPA = nP the
regulation is performed with real value of rPb.
rPb
Regulation probe B: (nP; P1; P2, P3, P4, P5) second probe used to regulate room temperature. If rPb = nP
the regulation is performed with real value of rPA
rPE
Regulation virtual probe percentage: (0 to 100%) it defines the percentage of the rPA respect to rPb. The value
used to regulate room temperature is obtained by:
value_for_room = (rPA*rPE + rPb*(100-rPE))/100
ELECTRONIC EXPANSION VALVE SUBMENU (Only XM679K)
FtY
Kind of gas (R22, 134, 404, 407, 410, 507,CO2): Type of gas used by plant. Fundamental parameter for
correct functioning of all system.
SSH Superheat setpoint: [0.1°C to 25.5°C] [1°F to 45°F] This is the value used to regulate superheat
CyP Cycle Period: (1 to 15s) Allows to set cycle time;
Pb Proportional band: (0.1 to 60.0 / 1 to 108°F) PI proportional band;
rS Band Offset: (-12.0 to 12.0°C / -21 to 21°F) PI band offset;
inC Integration time: (0 to 255s) PI integration time;
PEO
Probe Error opening percentage: (0 to 100%) if a temporary probe error occurs, valve opening percentage is
PEo until PEd time is elapsed;
PEd
Probe Error delay before stopping regulation: (0 to 239 sec. - On = unlimited) if probe error duration is bigger
than PEd then valve totally closes. Pf message displays. If PEd = On valve opening is PEo until probe error
finishes;
OPE
Start opening Percentage: (0 to 100%) Valve opening percentage when start function is active. This phase
duration is SFd time;
SFd
Start Function duration: (0.0 to 42.0 min: resolution 10s) Sets start function duration and post-defrost
duration. During this phase the alarms are neglected;
OPd
Opening Percentage after defrost phase: (0 to 100%) Opening valve percentage when after defrost function
is active. This phase duration is Pdd time;
Pdd
Post Defrost Function duration: (0.0 to 42.0 min: resolution 10s) Sets start function duration and post-defrost
duration. During this phase the alarms are neglected;
MnF
Maximum opening percentage at normal Functioning: (0 to 100%) during regulation it sets the maximum
valve opening percentage;
dCL
Delay before stopping valve regulation: (0 to 255s) When the cooling request goes off, the electronic valve
regulation can go on for the dCL time in order to prevent uncontrolled superheat variation;
Fot
Forced opening percentage: (0 to 100% - nu) it permits to force the valve opening to the specified value. This
value overwrites the value calculated by PID algorithm. CAUTION! To obtain the correct superheat
regulation you have to set Fot = nu;
Table 9-1 - XM670K to XM679K Parameters List