Recommended settings /
Comments
Compressor
regulation probe
selection
1 = Suction pressure
probe = SuP
Suction pressure switch / Room
thermostat input = 3 = diS
Use the liquid line
solenoid
NO >> If a solenoid is used in the
liquid line, see Chapter 2.13
"Pump-down - General" for
parameter settings
Suction pressure switch / Room
thermostat input = 1 = SuS
1 = Closed = CL (no change)
Table 10: External room thermostat - Parameters
Temperature control by means of an external temperature probe (not recommended for ZXDE
units)
The temperature of a cold room or cooling cabinet can be controlled by means of an additional
temperature (Analog Input AI7, component B7 in wiring diagram) probe (NTC, 10kΩ - for detailed
temperature-resistance-curve, see Appendix 8). The probe can be located in the evaporator or in
the room. The location of the probe has to be considered for the configuration of the P7C/A19 setting.
Based on the value provided by the B7-temperature sensor the compressor will be switched on and
off according to the following graphics:
Figure 9: External temperature sensor – Functionality
The following parameters need to be changed to control a cooling cabinet or a cold room with a
temperature sensor:
Recommended settings / Comments
Thermostat temp (NTC10K) = 2 = tnt or
Evaporator temp (NTC10K) = 5 = EPt
Compressor
regulation probe
selection
1 = Suction pressure
probe = SuP
Case temperature = 2 = CSt
Case temperature
probe selection
Thermostat temperature = 4 = tnt or
Evaporator temperature = 5 = EPt
Setpoint case
temperature
Choose setpoint according to
requirements of cooled goods
Position
differential case
temperature
Setpoint G02 + positive differential G03
results in cut-out value for compressor
To Next Page
Loading...
