T603 Modbus Thermostat
Key Specifications
· Modbus communication · 3.5″ touchscreen
· 2-pipe / 4-pipe · AC/DC compatible
· FCU + fresh air + floor heating
· Cooling / Heating / Floor cooling / Floor heating / Fresh air
· 86×86×40mm
Why choose T603
Control your entire HVAC system — fan coil, fresh air, and floor heating — all from one 3.5-inch touchscreen. Modbus integration ready.
· Touch-Smart Control – Modern, user-friendly interface.
· Standard 86-Type Size – Easy replacement and installation.
Operation Functions
1. Clock Adjustment
– Enter: While on, press and hold the Fan Speed button for 5 seconds.
– Adjust: Blue text indicates the active setting. Press Fan Speed to cycle through minutes, hours, and day-of-week. Use Up/Down buttons to change values.
– Save & Exit: Press the Power button.
2. Timer Function
-Enter: While on, press and hold the Mode button for 5 seconds.
Adjust: Blue text indicates the active setting. Press Fan Speed to cycle through timer minutes, hours, and status. Press Mode to switch between timer-on and timer-off settings. Use Up/Down buttons to change values.
– Save & Exit: Press the Power button.
3. Child Lock
-Toggle: While on, press and hold both Up and Down buttons for 5 seconds to enable/disable. When enabled, all buttons except Power are locked.
4. Factory Reset
– Action: While on, press and hold the Power and Down buttons together for 5 seconds.
5. Fault Alarm
-Trigger: Sensor short-circuit or temperature outside -30 ℃ to 80 ℃ range.
-Display: Shows “E1” on the screen and disconnects all loads. Returns to normal after the fault is cleared.
6. Frost Protection
– Condition: Activated when the unit is off.
– Action: Output turns on if room temperature ≤5 ℃ and turns off once it reaches ≥7 ℃, repeating this cycle.
7. Temperature Control Logic
– Cooling / AC + Floor Cooling: Output turns ON when room temp > (set temp + start differential). Turns OFF when room temp ≤ (set temp – 1℃).
– Heating / AC + Floor Heating / Hydronic Heating: Output turns ON when room temp < (set temp – start differential). Turns OFF when room temp ≥ (set temp + 1℃).
– Note: Fresh air and refrigerant-based AC systems are not temperature-controlled.
8. Advanced Mode
– Enter: While off, press and hold the Mode and Fan Speed buttons together for 5 seconds.
– Navigate: Use Up/Down to select a category → Press Mode to enter → Adjust parameters with Up/Down → Press Mode again to return to the category list.
– Save & Exit: From the category list, press the Power button. (Note: You must return to the category list to exit.)