T-503D digital temperature controller

T-503D digital temperature controller 
Navigating ModesThe T-503D features two main modes to control your chiller: 

• Intelligent Mode (F3 setting = 1): The controller maintains a water temperature a few degrees below the room temperature. This prevents condensation in humid environments. 
• Constant Mode (F3 setting = 0): The controller maintains a fixed temperature (usually set around 20°C) regardless of the room temperature. This is ideal for stable cooling, such as with laser cutters. 

Programming the ControllerTo change settings or switch between modes:

1. Unlock the menu: Press and hold the UP arrow and the SET button for 5 seconds.
2. Enter the password: The default password is 8. Use the UP arrow to reach 8, then press SET.
3. Find the parameter: Scroll to the setting you want (e.g., F3 for Control Method) and press SET.
4. Adjust the value: Use the UP or DOWN arrows to change the value (e.g., set to 0 for Constant Mode).
5. Save and exit: Press SET to confirm and RST (Reset) to exit. 

Key SettingsHere are the most important settings used for the T-503D: 

• F0: The target temperature set point (used in constant mode).
• F2: Hysteresis (the temperature range your chiller will allow before turning on the cooling compressor).
• F3: Control Method (0 for constant, 1 for intelligent).
• F7: Password (default is 8, can be changed). 

For a visual demonstration on how to toggle between the constant and intelligent modes: