Applications
These controls are used on any application where protection against overheat is required. Typical applications are:-
- ‘Boil dry’ protection for waterheaters, washing machines, dishwashers, vending machines (protection of heating elements)
- High temperature cut-out on central heating boilers
- Blocked flue sensor on boilers with natural draft (on operation the gas supply to the burner is switched off)
- Protection against overheating in panel/convector heaters
- Overheat safety for AC cassette units equipped with an electric boost heater
- Overheat safety on compressor discharge pipes
| Electrical Rating: | L7/LM7: 16A 400V~resistive 3A 400V~inductive LM8: ratings apply to each pole |
| Switch: | SPST break on rise of temperature DPST (LM8) break on rise of temperature (note: for millivolt application L7/LM7 can be supplied with goldplated contacts) |
| Terminals: | Tab 6,3mm |
| Terminal Configuration: | As shown, earth terminals available if required |
| Approvals: | Approved throughout Europe Special versions approved for North America (see chart) |
| Maximum Head Temperature: |
At least 15ºC below sensed temperature, max 90ºC |
| Temperature Range: | Fixed settings between 50ºC and 160ºC to order (factory set) |
| Tolerances: | Standard ±8ºK on models with-out temperature, 50 – 115ºC ±3ºK is available |
| Capillary Length: | 450 and 2000mm(in accordance to customer specification) |
| Capillary Insulation: | Available on request |
| Capillary Form: | Straight or coiled (minimum diameter 6mm) Approximately 400mm of capillary or the complete sensing element is required for optimum sensing |
| Cross Ambient: | Cross ambient versions with solid bulbs are available (LM7 and LM8 only). Temperature range 50 – 130°C. The following information should be supplied with every enquiry:
|
Barometric Effect
The control is calibrated to cut-out within the specified tolerance at a barometric pressure of 760mm Hg. For pressure higher (or lower) than this add (or subtract) 1°C for every 25mm Hg change.
This control must be applied and installed in line with local approvals and practices. Suitable earthing must be made by
appliance manufacturer and installer.
