14
AB-6600
Operations
Set a desired temperature (refer to
Settings
) and power on the thermostat to run it automatically.
z
Model TY6800Z
Figure 24.
Setpoint and differential gap for Model TY6800Z
< Cooling control >
Based on the cooling control system shown in
Figure 14. Example of wiring for cooling
, operation of Model
TY6800Z thermostat is described assuming the temperature setpoint: -5 °C, differential gap: 3 °C.
(1) When the temperature of the controlled target rises to the setpoint (-5 °C), the internal switch works to
close the terminal R and W, and then the chiller starts.
(2) When the temperature of the controlled target falls to -8 °C, that is setpoint (-5 °C) minus the differential
gap (3 °C), the internal switch works to open the terminal R and W, and then the chiller stops.
(3) The operations (1) and (2) described above are repeated automatically to control the temperature at the
setpoint (-5 °C).
Figure 25. Example of cooling control for TY6800Z
< Heating control >
Based on the cooling control system shown in
Figure 15. Example of wiring for heating
, operation of Model
TY6800Z thermostat is described assuming the temperature setpoint: 50 °C, differential gap: 3 °C.
(1) When the temperature of the controlled target falls to 47 °C, that is setpoint (50 °C) minus the differential
gap (3 °C), the internal switch works to close the terminal R and W, and then the heater starts.
(2) When the temperature of the controlled target rises to the setpoint (50 °C), the internal switch works to
open the terminal R and W, and then the heater stops.
(3) The operations (1) and (2) described above are repeated automatically to control the temperature at the
setpoint (50 °C).
Figure 26. Example of heating control for TY6800Z
Note: If the chiller's compressor motor, solenoid valve and heater, and solenoid valve start and stop very frequently, in another words the
devices start and stop very frequently, adjust the differential gap large by turning the adjustment dial in Model TY6800Z.
[°C]
Sensor (ambient temp.)
Temperature rise
Sensor (ambient temp.)
Temperature fall
Differential gap
Approx. 3–11 °C (variable)
Setpoint
Between terminal R and W: Open
Between terminal R and B: Close
Between terminal R and W: Close
Between terminal R and B: Open
Temperature
of sensor [°C]
Differential gap
3 °C
-5
(Setpoint)
-8
(2)
(1)
Chiller ON
Between R and W: Close
Between R and B: Open
Chiller OFF Between R and W: Open
Between R and B: Close
Temperature
of sensor [°C]
Differential gap
3 °C
50
(Setpoint)
47
(1)
(2)
Heater ON
Between R and W: Open
Between R and B: Close
Heater OFF Between R and W: Close
Between R and B: Open