Freeze Protection Thermostat ANDFST3 / ANDFST6 device surveilling hot water heating coils and heat exchangers in ventilation and air-conditioning systems as well as heating appliances. The freeze-protection thermostat prevents water-bearing tanks and heat exchangers from freezing over and is equipped with an automatic reset.
Product number
Product number: ANDFST3 / ANDFST6
Technical specification
| Switching capacity: | 16A, 250V open or closed, 1A, 250V opposite side |
| Terminals: | 1 common, 2 opens contact at a higher temperature, 4 closes a contact when the temperature rises |
| Cable inlet: | conductor isolation, 14 mm |
| Storage temperature: | -30 °C … +55 °C |
| Installation: | Two threaded holes in the backside of the casing (M4x6, included in the delivery) |
| Settings: | via hex nut |
| Housing: | Plastic Noryl SE1, grey cover |
| Dimensions (L x W x H): | 86 x 49 x 76 mm |
| Protection rating: | IP44 |
| Sensor Element: | A gas-filled tin-coated copper capillary tube |
| Temperature/adjustment range: | -18 °C … +13 °C |
| Accuracy: | ± 1,2 °C |
| Accessories: | Set of fasteners for the capillaries + mounting bracket (included) |
Datasheet ANDFST3 / ANDFST6
Versions of ANDFST3 / ANDFST6
| Typ | Description | Features |
| ANDFST3 | 3m capillaries | automatic reset |
| ANDFST6 | 6m capillaries | automatic reset |
| ANDFST3.1 | 3m capillaries | manual reset |
| ANDFST6.1 | 6m capillaries | manual reset |
ANDFST3 / ANDFST6 Freeze protection Thermostat – Switching Use Cases
- Automatically activates auxiliary heating elements (e.g., electric heat tapes, hot water pumps) during freezing conditions.
- Triggers alarms or shuts down non-essential systems to prioritize critical freeze protection.
- Controls heat exchangers or glycol systems in industrial applications to prevent liquid line freezing.
- Manages zone valves or initiates boiler operation in residential and commercial HVAC systems.
- Ensures preventive measures and efficient resource allocation to optimize system performance.
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