Emerson XM670 Installation And Operation Manual page 18

Remote display: (nP; P1; P2, P3, P4, P5, P6, tEr, dEF) it selects which probe is displayed by the X-REP. P1,
red
P2, P3, P4, P5, P6, tEr= virtual probe for thermostat, dEF= virtual probe for defrost.
Display delay: (0 to 24.0 m; resolution 10s) when the temperature increases, the display is updated of 
dLy
1 °F/1°C after this time.
Regulation probe A: (nP; P1; P2, P3, P4, P5) first probe used to regulate room temperature. If rPA = nP the
rPA
regulation is performed with real value of rPb.
Regulation probe B: (nP; P1; P2, P3, P4, P5) second probe used to regulate room temperature. If rPb = nP
rPb
the regulation is performed with real value of rPA
Regulation virtual probe percentage: (0 to 100%) it defines the percentage of the rPA respect to rPb. The value
rPE
used to regulate room temperature is obtained by: value_for_room = (rPA*rPE + rPb*(100-rPE))/100
ELECTRONIC EXPANSION VALVE SUBMENU (Only XM679)
Kind of gas (R22, 134, 404, 407, 410, 507,CO2): Type of gas used by plant. Fundamental parameter for
FtY
correct functioning of all system.
SSH Superheat setpoint: [1°F to 45°F] [0.1°C to 25.5°C] This is the value used to regulate superheat.
CyP Cycle Period: (1 to 15s) Allows to set cycle time
Pb Proportional band: (1 to 108°F / 0.1 to 60.0) PI proportional band
rS Band Offset: (-21 to 21°F / -12.0 to 12.0°C) PI band offset
inC Integration time: (0 to 255s) PI integration time
Probe Error opening percentage: (0 to 100%) if a temporary probe error occurs, valve opening percentage is
PEO
PEo until PEd time is elapsed.
Probe Error delay before stopping regulation: (0 to 239 sec. - On = unlimited) if probe error duration is bigger
PEd than PEd then valve totally closes. Pf message displays. If PEd = On valve opening is PEo until probe error
finishes.
Start opening Percentage: (0 to 100%) Valve opening percentage when start function is active. This phase
OPE
duration is SFd time.
Start Function duration: (0.0 to 42.0 min: resolution 10s) Sets start function duration and post-defrost
SFd
duration. During this phase the alarms are neglected.
Opening Percentage after defrost phase: (0 to 100%) Opening valve percentage when after defrost function
OPd
is active. This phase duration is Pdd time.
Post Defrost Function duration: (0.0 to 42.0 min: resolution 10s) Sets start function duration and post-defrost
Pdd
duration. During this phase the alarms are neglected.
Maximum opening percentage at normal Functioning: (0 to 100%) during regulation it sets the maximum
MnF
valve opening percentage.
Delay before stopping valve regulation: (0 to 255s) When the cooling request goes off, the electronic valve
dCL
regulation can go on for the dCL time in order to prevent uncontrolled superheat variation.
Forced opening percentage: (0 to 100% - nu) it permits to force the valve opening to the specified value. This
Fot value overwrites the value calculated by PID algorithm. CAUTION! To obtain the correct superheat
regulation you have to set Fot = nu.
Type of Pressure Transducer: (PP - LAn) it sets type of pressure transducer to use: PP= 4 to 20mA pressure
tPP transducer or ratiometric transducer 0 to 5V depending on P5C parameter, LAn= the pressure signal arrives
from another XM600. Referred to Pb5
Table 8-1 - XM670 to XM679 Parameters List
12 • XM679K I&O Manual 026-1218 Rev 4