ENG
for this type of valve, for example, the maximum number of opening steps is 480.
Refrigerant type (par. PH)
This is used to set the type of refrigerant used in the system. The table below shows the possible types of
refrigerant and the associated values of PH. For compatibility with the E2V valve, see the manual for the
connected driver. Contact CAREL if installing E2V valves in systems that use refrigerants not listed in the
table.
Code Description
Def Min Max UOM User
User
terminal
PH
Refrigerant
Val. Desc.
Val. Desc.
Val. Desc.
0
Custom gas
14
R417A
28
HFO1234ze
1
R22
15
R422D
29
R455A
2
R134a
16
R413A
30
R170
3
R404A
17
R422A
31
R442A
4
R407C
18
R423A
32
R447A
5
R410A
19
R407A
33
R448A
6
R507A
20
R427A
34
R449A
7
R290
21
R245Fa
35
R450A
8
R600
22
R407F
36
R452A
9
R600a
23
R32
37
R508B
10
R717
24
HTR01
38
R452B
11
R744
25
HTR02
39
R513A
12
R728
26
R23
40
R454B
13
R1270
27
HFO1234yf
3
0
40
-
S
NO
Important:
if the type of refrigerant is incorrect, the superheat measurement will be wrong, with the
risk of liquid returning to the compressor.
In addition, a temperature/pressure conversion curve corresponding to an arbitrary new refrigerant can
be entered (custom gas) by writing from the supervisor suitable coefficients, a numeric ID for the gas and
the CRC protection value. The coefficients are provided by Carel. Once the new refrigerant has been
entered, it will be available by setting parameter PH to 0. The value 0 can only be applied if the cyclic
redundancy check (CRC) does not detect errors. If the coefficients are modified after having chosen to use
a custom refrigerant (PH = 0) and the CRC check fails, alarm GPE will be displayed on the user interface
and control will stop.
Superheat set point (par. P3)
Code
Description
Def
Min
Max
UOM
User
User
terminal
P3
Superheat set point
10
0
25
K
S
YES
The parameter that electronic valve control is based on is superheat, which effectively tells whether or
not there is liquid at the evaporator outlet. Superheat is calculated as the difference between:
superheated gas temperature (measured by a temperature sensor located at the end of the outlet tGS)
and the saturated evaporation temperature (calculated based on the reading of a pressure transducer
located at the evaporator outlet (PEu/tEu) and using the Tsat(P) conversion curve for each refrigerant)
SH = tGS - tEu
SH = superheat (K)
tGS = superheated gas temperature (°C/°F);
tEu = saturated evaporation temperature, converted from the pressure (°C/°F).
If superheat is high it means that the evaporation process is completed well before the evaporator outlet,
and therefore flow-rate of refrigerant through the valve is insufficient. This causes a reduction in cooling
efficiency due to the failure to exploit part of the evaporator.
74
| 5. Functions
0300086EN rel. 1.0 – 04.09.2018
Содержание MPXone ACS00CB000010
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