AB-7258 
15 
Thermostat (two-position one-step type) Model TTY6023Z2000 
Model number  Mode 
Contact between: 
Blue and red wires  Gray and red wires  White and pink wires  Black and pink wires 
TTY6023Z2000(-1)  Cooling (step 1)  Closed  Open  N/A  N/A 
Cooling (step 2)  Closed  Open  Closed  Open  
Heating (step 1)  N/A  N/A  Open  Closed 
Heating (step 2)  Open  Closed  Open  Closed 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Humidistat (two-position one-step type) Model HY6000Z2000(-1) 
Model number  Mode 
Contact between: 
Terminals L and C  Terminals H and C 
HY6000Z2000(-1)  Humidifying  Open  Closed 
Dehumidifying  Closed  Open  
 
 
 
 
 
 
 
 
 
 
 
 
 
Cooling (step 2)
ON
Differential 
Approx. 1.5 °C (fixed) 
Temperature 
Low High 
Figure 18.  Switching action of  
Model TTY6023Z2000(-1) in cooling mode 
Cooling (step 2) 
OFF
Differential
Approx. 1.5 °C (fixed)
Cooling (step 1)
ON
Cooling (step 1)
OFF
Setpoint 
Differential between steps 
pprox. 2 °C (fixed) 
Differential 
Approx. 1.5 °C (fixed) 
Differential 
pprox. 1.5 °C (fixed) 
Setpoint 
Heating (step 2)
ON
Heating (step 2) 
OFF
Heating (step 1)
ON
Heating (step 1)
OFF
Differential between steps
Approx. 2 °C (fixed)
Temperature 
Low High 
Figure 19.  Switching action of  
Model TTY6023Z2000(-1) in heating mode 
Humidifying 
ON
Differential 
Approx. 5 %RH (fixed) 
Setpoint 
Humidity 
Lo
High 
Figure 20.  Switching action of  
Model HY6000Z2000(-1) in humidifying mode 
Humidifying 
OFF
Differential 
Approx. 5 %RH (fixed) 
Setpoint 
Humidity 
Lo
High 
Figure 21.  Switching action of  
Model HY6000Z2000(-1) in dehumidifying mode 
Dehumidifying
ON
Dehumidifying 
OFF