Figure 11: External Temperature Sensor - Functionality - Emerson Copeland EazyCool ZX Series Application Manuallines

With these settings the controller will switch the compressor according to the status of the connected
device (room thermostat):
▪ if the input is closed, turn the compressor on (On-Off-compressor)
▪ if the input is open, turn the compressor off (On-Off-compressor)
Temperature control by means of an external temperature probe (not recommended for ZXDY
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 7). 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 11: External temperature sensor – Functionality
The following parameters must be adjusted to control a cooling cabinet or a cold room with a
temperature sensor:
Parameter Description
Probe 7
A19
configuration
Compressor
C05 regulation probe
selection
Case temperature
G01
probe selection
Setpoint case
G02
temperature
Position differential
G03
case temperature
Case temperature
G04
lower limit G02
Case temperature
G05
upper limit G02
Emergency run on-
G06
time
Emergency run off-
G07
time
Table 12: External temperature sensor – Parameters
Please check that G56 is set to "NO", ie, "no solenoid valve in the liquid line". Also check that no
additional digital inputs are configured (Digital Input DI3; parameter R07 has to be set to "not used"
= nu = 0).
14
Factory settings /
Range
0 = Not used = nu
1 = Suction pressure
probe = SuP
0 = Not used = nu
2 °C
1 K / 0.1 to 25.5 K
-10 °C / -40 °C to G05
+15 °C / G04 to 110 °C
2 min / 0 to 255 min
1 min / 0 to 255 min
Recommended settings / Comments
Thermostat temp (NTC10K) = 2 = tnt or
Evaporator temp (NTC10K) = 5 = EPt
Case temperature = 2 = CSt
Thermostat temperature = 4 = tnt or
Evaporator temperature = 5 = EPt
Choose setpoint according to requirements
of cooled goods
Setpoint G02 + positive differential G03
results in cut-out value for compressor
Define limits to avoid wrong settings for G02
Define limits to avoid wrong settings for G02
In case of probe failure, the compressor will
cycle for a time defined by G06 & G07
In case of probe failure, the compressor will
cycle for a time defined by G06 & G07
AGL_Unit_ZX_A2L_E_Rev00