37
ENG
Hecu CO
2
+0300085EN rel. 2.2 - 07.05.2019
Guided commissioning procedure
When fi rst started, MPXPRO opens a guided procedure that helps the
user set the main parameters for the confi guration of the electronic valve
and the serial network.
Commissioning parameters
Par. Description
/P2 Type of probe, group 2 (S4, S5)
/P3 Type of probe, group 3 (S6)
/Fd Assign tGS (superheated gas temperature probe)
/FE Assign PEu/tEu (saturated evaporation pressure/temperature probe)
/U6 Maximum value of probe 6
/L6 Minimum value of probe 6
P1 Electronic valve
PH Type of refrigerant
In Type of unit
Sn Number of slaves in the local network
H0 Serial or Master Slave network address
Tab. 7.a
The parameters can be set from the user terminal or the remote control.
If using the remote control, a terminal with display and infrared (IR) port
is required.
After powering on the controller:
1. the fi rst parameter is displayed: /P2 = type of probe, group 2 (S4, S5)
2. press Set to display the parameter value;
3. press UP/DOWN to modify the value;
4. press Set to confi rm, the “spanner” icon is no longer shown, indicating
that the setting has been performed;
5. press UP and repeat steps 2, 3 & 4 for the subsequent parameters; /P3, /Fd,
/FE, /U6, /L6, P1, PH, In, Sn, H0;
6. press Prg/mute for 5 s to exit the guided commissioning procedure.
MPXPRO
Fig. 7.r
/P2: Type of probe, group 2 (S4, S5)
This is used to select the type of temperature probe to be used for inputs
S4 and S5.
Par. Description Def Min Max UOM
/P2 Type of probe, group 2 (S4, S5)
0 = NTC Standard Range –50T90 °C
1 = PTC Standard Range –50T150 °C
2 = PT1000 Standard Range –50T150 °C
3 = NTC L243 Standard Range –50T90 °C
003-
Tab. 7.b
Note: the NTC L243/PTC/PT1000 probes can only be confi gured on
the full optional models or with EEV driver. To assign the functions
of the other probes, see parameters /FA, /Fb, /Fc, /Fd, /FE,
/FF, /FG, /FH, /FI, /FL, /FM. For calibration, see parameters /c4, /c5.
/P3: Type of probe, group 3 (S6)
Selects the type of temperature or ratiometric pressure probe for input
S6.
Par. Description Def Min Max UOM
/P3 Type of probe, group 3 (S6)
0 = NTC Standard Range –50T90 °C
1 = PTC Standard Range –50T150 °C
2 = PT1000 Standard Range –50T150 °C
3 = NTC L243 Standard Range –50T90 °C
4 = 0 to 5 V ratiometric probe
004-
Tab. 7.c
Note: the NTC L243/PTC/PT1000 probes can only be confi gured on
the full optional models or with EEV driver.
/Fd: Assign tGS (superheated gas temperature probe)
This is used to assign the measurement of the superheated gas
temperature at the evaporator outlet to the selected probe.
Par. Description Def Min Max UOM
/Fd Assign tGS (superheated gas temperature)
0 = Function
disabled
6 = Probe S6
1 = Probe S1 7 = Probe S7
2 = Probe S2 8 = Serial probe S8
3 = Probe S3 9 = Serial probe S9
4 = Probe S4 10 = Serial probe S10
5 = Probe S5 11 = Serial probe S11
0 0 11 -
Tab. 7.d
/FE: Assign PEu/tEu (saturated evaporation pressure/temperature
probe)
Assigns the probe used to measure the saturated evaporation pressure/
temperature, which by default is the probe connected to input S6. It is
recommended to use the 0 to 5 Vdc ratiometric probe.
Par. Description Def Min Max UOM
/FE Assign PEu/tEu (saturated evaporation pressure/
temperature probe). See /Fd
0 0 11 -
Tab. 7.e
/U6, /L6: Maximum/minimum value of probe S6
Parameters /L6 and /U6 are used to set the maximum and minimum
limits for the range of measurement of the probe connected to input S6.
Par. Description Def Min Max UOM
/U6 Maximum value of probe 6 9.3 /L6 160 barg, RH%
/L6 Minimum value of probe 6 -1.0 -20 /U6 barg, RH%
Tab. 7.f
P1: Type of electronic expansion valve
MPXPRO can control the CAREL E
2
V electronic expansion valve.
The CAREL electronic expansion valve is required for the Hecu CO2, and
therefore this parameter must always be set to “2”.
Par. Description Def Min Max UOM
P1 Electronic valve
0 = not present
1 = PWM valve
2 = CAREL E
2
V valve
002-
Tab. 7.g
PH: Type of refrigerant
The type of refrigerant is essential for calculating the superheat value.
In addition, it is used to calculate the evaporation and condensing
temperature based on the pressure probe reading. The following table
shows the refrigerants that are allowed and corresponding compatibility
with the CAREL E
2
V valve. In this case, the value must be set for CO2, i.e.
PH=11.
Par. Description Def Min Max
PH Type of refrigerant
0 = Custom gas 13 = R1270
1 = R22 14 = R417A
2 = R134a 15= R422D
3 = R404A 16= R413A
4 = R407C 17= R422A
5 = R410A 18= R423A
6 = R507A 19= R407A
7 = R290 20= R427A
8 = R600 21= R245Fa
9 = R600a 22= R407F
10 = R717 23 = R32
11 = R744 24 = HTR01
12 = R728 25 = HTR02
3025
Tab. 7.h
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