Emerson Copeland EazyCool ZX Series - Table 9: Room Thermostat External Parameters; Figure 9: External Temperature Sensor - Functionality

12 C6.1.6/0613-0915/E
Temperature control by means of external room thermostat
The temperature of a cold room or cooling cabinet can be controlled by means of an external
room thermostat (Digital Input DI3, parameter R07).
The following parameters need to be changed to control a cooling cabinet or a cold room with a
room thermostat:
Parameter
Description
Factory settings /
Range
Recommended setting /
Comments
C05
Compressor
regulation probe
selection
1 = Suction pressure
probe = SUP
Suction pressure switch / Room
thermostat input = 3 = diS
G56
Use the liquid line
solenoid
NO
NO >> If a solenoid is used in
liquid line, see Chapter 2.12
"Pumpdown - General" for
parameter settings
R07
Digital Input 3
function
0 = Not used = NU
Suction pressure switch / Room
thermostat input = 1 = SUS
R08
Digital Input 3
polarity
1 = Closed = CL
1 = Closed = CL (no change)
Table 9: Room thermostat external parameters
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 external temperature probe
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, detailed
temperature-resistance-curve, see Appendix 7). The probe can be located in the evaporator or
in the room. The location of the probe needs 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 graphic:
Figure 9: External temperature sensor – Functionality