Q: Can the SB655 C control a defrost heater? A: The base model has only one relay. You would need an external timer or an add-on module (like an Eliwell FRD) to manage defrost. The "SB655 C" is primarily a thermostat, not a defrost controller.
Q: What is the default password for the Eliwell SB655 C? A: The most common default is 3 (three). If that fails, try 5, 55, 22, or 0. If none work, the password has been changed by a previous technician. You may need to contact technical support for a backdoor reset code.
Q: Why is my SB655 C showing “dLy” on the screen? A: That is not an error. The display is showing that the compressor is in a minimum off-time delay (parameter dLy). It is protecting the compressor from short cycling. The countdown value will appear (e.g., “3” for 3 minutes remaining).
Q: What probe works with the SB655 C? A: ELIWELL NTC 10kΩ at 25°C (probe type: NTC103AT) is standard. PTC probes (PtC) are also supported if you change parameter S1P to “PtC.” Do not use PT100 (RTD) probes; they are incompatible.
| Parameter | Description | Typical Refrigerator (0-5°C) | Typical Freezer (-18°C) |
| :--- | :--- | :--- | :--- |
| c1 | Compressor differential (hysteresis). The compressor stops at SP and restarts at SP + c1. | 2.0°C | 3.0°C |
| c2 | Compressor protection delay (anti-short cycle). Minimum time between stops and restarts. | 3 minutes | 4 minutes |
| c3 | Probe display offset. Calibrates if the reading is wrong. | 0.0 | 0.0 |
| c4 | Defrost interval (in hours). | 6 hours | 8 hours |
| c5 | Defrost duration (in minutes). | 20 minutes | 30 minutes |
| c6 | Defrost type: 0 = Electrical (Heater), 1 = Hot gas/Off-cycle. | 1 (Off-cycle) | 0 (Electrical) |
| c7 | Drip time after defrost (minutes). | 2 min | 5 min |
| AL1 | Low temperature alarm threshold (relative to setpoint). | -2.0°C | -22.0°C |
| AL2 | High temperature alarm threshold (relative to setpoint). | +4.0°C | +10.0°C |
| ALd | Alarm delay (minutes before sounding). | 60 min | 60 min |
| F3 | Temperature unit: 0 = °C, 1 = °F. | 0 | 0 | eliwell sb655 c manual
| Parameter | Value | |-----------|-------| | Power Supply | 230Vac ±10%, 50/60Hz | | Power Consumption | 3 VA max | | Operating Temperature | 0 to 55°C (32 to 131°F) | | Storage Temperature | -20 to 70°C (-4 to 158°F) | | Relative Humidity | 10-90% non-condensing | | Probe Input | PTC (1000Ω @ 25°C) or NTC (103AT-2) | | Measurement Range | -50 to +110°C (-58 to 230°F) | | Resolution | 0.1°C (1°F) | | Outputs: Compressor | SPST relay, 16A resistive @ 250Vac | | Outputs: Defrost | SPST relay, 8A resistive @ 250Vac | | Digital Input | Volt-free contact | | Protection Class | IP65 front panel | | Mounting | Panel (71x29mm cutout) |
| Code | Description | Range | Default | |------|-------------|-------|---------| | P2 | Probe type | 0=PTC, 1=NTC | 1 (NTC) | | OU | Measurement unit | 0=°C, 1=°F | 0 | | CA | Probe calibration offset | -12.0 – 12.0 | 0.0 | | rE | Resolution | 0=1°, 1=0.1° | 1 |
If you are searching for the Eliwell SB655 C manual, you likely have a refrigeration or HVAC control panel in front of you that needs programming, troubleshooting, or an electrical connection check. The Eliwell SB655 C is a classic, highly reliable digital temperature controller widely used in commercial refrigeration, cold rooms, industrial freezers, and HVAC systems. However, without the manual, navigating its parameters and terminal blocks can be daunting.
This article serves as a complete digital handbook. We will cover everything from the technical specifications and terminal functions to step-by-step programming, parameter lists, alarm codes, and common wiring diagrams. Q: Can the SB655 C control a defrost heater
While this guide provides 90% of daily operations, you should always keep the original manufacturer's manual on hand for advanced parameters (fan management, digital input logic, and special configs like r1 to r6).
You can obtain the official Eliwell SB655 C manual from these sources:
Pro Tip: Search for the exact string "SB655C_GB.PDF" – this is the original English manual file name used by Eliwell.
The Eliwell SB655 C manual lists several alarm codes on the display. Here is how to interpret them: | Parameter | Description | Typical Refrigerator (0-5°C)
| Alarm Code | Meaning | Likely Cause & Solution | | :--- | :--- | :--- | | E0 | Internal EEPROM error | Faulty controller; replace unit. | | E1 | Probe 1 faulty (open circuit) | Broken probe, loose wire at terminals 2/3, or wrong S1P setting. | | E2 | Probe 1 short circuit | Moisture in probe tip, damaged probe, or short across terminals 2-3. | | HA | High temperature alarm | Temperature above ALU (alarm upper limit). Check compressor, refrigerant, fans. | | LA | Low temperature alarm | Temperature below ALL (alarm lower limit). Check setpoint, probe placement. | | PFA | Probe failure alarm – output forced | Controller is running a timed cycle because E1/E2 is active. Check probe wiring. |
General Troubleshooting Steps:
You will typically find the SB655 C in: