RET-77-S-24V ▪︎ Multifunctional PID Boiler Thermostat (24V)

          PV: 127
        

AL1 AL2

        SET: 120
      

Set Value: 120°C

SSR Output:

NOTICE: This device is an old series model and is provided for backup purposes only. For new projects, please check similar products.

Description: RET-77-S-24V is a dual-display, multifunctional boiler thermostat with PID control. It supports various thermocouples and optional Pt100 RTD sensors. It offers simultaneous PV and SET display, SSR output, and up to two alarm relays.

Power Supply: 24VAC/DC (+10% ~ -20%)
Case Dimensions: 72mm x 72mm x 82mm
Display: Dual 4-digit LED (14mm for PV, 12mm for SET)
Input Types: J, K, T, S, R thermocouples and Pt100 RTD
Accuracy: ±0.5% FS, ±1 digit
Outputs: 1 control relay + 1 or 2 alarm relays (3A / 250VAC)

[SET VALUE ADJUSTMENT]

Press the SET button once to display the target value. A dot on the top left will blink. Use "+" or "−" to adjust the temperature.

[PARAMETER ACCESS]

Hold the SET button for 4 seconds until “E n G c” appears. Enter "11" to access full parameters. Use ↑ / ↓ to navigate, press P to modify values.

[INSTALLATION NOTES]

After any parameter change, power off and restart the device to apply changes. Ensure relay load is within limits and external protection is used against overcurrent.

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