Carel EVD Evolution Twin - Backup probes on S3 & S4; Subcooling measurement

ENG
“EVD Evolution TWIN” +0300006EN - rel. 2.6 - 31.01.2019
64
Examples of operation:
1. oset too low (or function
disabled)
S4
t
t
OFF
set point
set point + di
ON
SV
2. oset too high
S4
t
t
OFF
set point
set point + di
ON
SV
3. oset correct
S4
t
t
OFF
set point
set point + di
ON
SV
Fig. 13.i
Key:
di= dierential
SV= solenoid valve (showcase temperature control)
S4= temperature
S2 S4
S1
EVD
evolution
P
E
V
S
F
L
M
T
T
CP
C
EEV
Fig. 13.j
Key:
CP Compressor EEV Electronic expansion valve
C Condenser V Solenoid valve
l Liquid receiver E Evaporator
F Dewatering lter P Pressure probe (transducer)
S Liquid indicator T Temperature probe
For the wiring, see paragraph “General connection diagram”.
Backup probes on S3 & S4
Important: this type of control is compatible with the “main control”
parameter setting between 1 and 18.
In this case, pressure probe S3 and temperature probe S4 will be used to
replace probes S1 and S2 respectively in the event of faults on one or both, so
as to guarantee a high level of reliability of the controlled unit.
S2 S4 S3
S1
EVD
evolution
P
E
V
S
F
L
M
T PT
CP
C
EEV
Fig. 13.k
Key:
CP Compressor EEV Electronic expansion valve
C Condenser V Solenoid valve
L Liquid receiver E Evaporator
F Dewatering lter P Pressure probe (transducer)
S Liquid indicator T Temperature probe
For the wiring, see paragraph “General connection diagram”.
Subcooling measurement
This function measures subcooling using a pressure probe and a temperature
probe connected to inputs S3 and S4 respectively. The reading can be sent to
a controller connected in the serial network (e.g. pCO).
TAPA
L
V
M
EEV
CP
EVD
evolution
S2S1 S4
S3
TB
PB
S
F
C
E
Fig. 13.l
Key:
CP Compressor EEV Electronic expansion valve
C Condenser V Solenoid valve
L Liquid receiver E Evaporator
F Filter-drier PA, PB Pressure probes
S Liquid gauge TA, TB Temperature probes
For the wiring, see paragraph “General connection diagram”