Carel iJW handleiding
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iJW +0300103EN rel. 1.1 - 31.03.2025
Index
10.4 Low and high temperature alarms LO and HI
The high and low temperature alarm thresholds can be relative or absolute, depending on the value of parameter A1:
• A1 = 0: the relative thresholds AL and AH are considered and represent the deviation from the set point; the low temperature
alarm is activated at set point - AL, and the high temperature alarm at set point + AH. If the set point changes, the alarm ac-
tivation point also changes automatically.
• A1 = 1, the absolute thresholds ALA and AHA are considered, representing the absolute low temperature and high tempera-
ture alarm threshold, respectively. If the set point changes, the activation point remains the same.
Par. Description Def Min Max UOM User User terminal
d8 Bypass high temperature alarm time after defrost 30 1 240 min S YES
A0 High and low temperature alarm reset diff erential 2 0.1 20 °C/°F S NO
A1 Alarm thresholds (AL, AH) relative to the set point St or absolute:
0 = relative; 1 = absolute
0 0 1 - S YES
A6 Stop compressor with external alarm (Toff = 15 minutes, fi xed):
0 = compressor always OFF; 100 = compressor always ON
0 0 100 min S NO
Ad Delay time for high and low temperature alarms (AH, AL) 120 0 240 min U YES
Add High temperature alarm bypass time for door open 30 1 240 min U YES
AH Relative high temperature alarm threshold 0 0 555/999 Δ °C/°F U YES
AHA Absolute high temperature alarm threshold 537/999 -100/-148 537/998 °C/°F U YES
AL Relative low temperature alarm threshold 0 0 200/360 Δ °C/°F U YES
ALA Absolute low temperature alarm threshold -100/-148 -100/-148 537/998 °C/°F U YES
Relative thresholds
Parameter AL is used to set the activation threshold for the low temperature alarm LO. The value measured by the control probe
is continuously compared against the value of St-AL, and if it falls below this value for a time longer than Ad, the low temperature
alarm LO is activated. The low temperature alarm LO ceases automatically when the temperature rises back above St-AL+A0.
Similarly, parameter AH is used to set the activation threshold for the high temperature alarm HI. The value measured by the
control probe is continuously compared against the value of St+AH, and if it rises above this value for a time longer than Ad, the
high temperature alarm HI is activated. The high temperature alarm HI ceases automatically when the probe reading falls below
St+AH-A0.
ALARM
OFF
ON
300100_152_R01
S1
LO HI
A0
St
AH
AL
A0
Ref. Description
LO Low temperature alarm
HI High temperature alarm
S1 Control probe
St Set point
AL Relative low temperature alarm threshold
AH Relative high temperature alarm threshold
A0 Return diff erential
Fig. 10.b
Absolute thresholds
Parameter ALA is used to set the activation threshold for the low temperature alarm LO. The value measured by the control probe
is continuously compared against the value of ALA, and if it falls below this value for a time longer than Ad, the low temperature
alarm LO is activated. The low temperature alarm LO ceases automatically when the temperature rises back above ALA+A0.
Similarly, parameter AHA is used to set the activation threshold for the high temperature alarm HI. The value measured by the
control probe is continuously compared against the value of AHA, and if it rises above this value for a time longer than Ad, the
high temperature alarm HI is activated.
The high temperature alarm HI ceases automatically when the probe reading falls below AHA-A0.
ALARM
OFF
ON
300100_147_R01
S1
LO HI
A0
ALA AHA
A0
Ref. Description
LO Low temperature alarm
HI High temperature alarm
S1 Control probe
AL Low temperature alarm threshold
AH High temperature alarm threshold
A0 Return diff erential
Fig. 10.c
The high temperature alarm is ignored during defrosts for a time set by parameter Add after opening the door, and for parameter
d8 after defrosting, to avoid false signals. Once the times set by parameter Add or d8 have elapsed, the delay set by parameter
Ad starts counting and the alarm is signalled when it elapses.
The active low temperature alarm LO is signalled by the buzzer and the code LO shown on the display, while the active high
temperature alarm HI is signalled by the buzzer and the code HI.
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Productinformatie
| Merk | Carel |
| Model | iJW |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 14964 MB |
