Single-phase thermostat LF L3444062

A thermostat controls the temperature inside ovens, fryers, bain-maries and other heated catering appliances by sensing the heat and switching the power on or off. The bulb at the end of the capillary tube expands a gas or liquid when the temperature rises; the pressure moves a diaphragm that opens or closes an electrical contact. This method gives precise, repeatable regulation without electronic components, making it dependable for continuous professional use.

The operator fits the pen-shaped bulb into the appliance's thermowell, routes the capillary to the control panel and connects the D-shaped pin to the thermostat base. The auxiliary selector switch lets the user override the thermostat setting or choose between two preset temperatures without altering the main dial. Once the appliance is powered, the thermostat automatically maintains the chosen temperature by cycling the heating element on and off as needed.

The thermostat is built with a 900 mm capillary tube and a 3 mm diameter bulb, both designed to fit standard thermowells in commercial equipment. The D-shaped pin connector ensures secure attachment to the control base. A single-phase contact rated for 16 A at 250 V handles the electrical load of most catering appliances. The auxiliary selector switch is integrated into the unit, eliminating the need for a separate component.

The temperature range of 50–320 °C covers everything from gentle warming to deep frying and baking. The 900 mm capillary length allows the bulb to be positioned deep inside large appliances while keeping the control panel accessible. The single-phase contact capacity matches the electrical supply of most professional kitchens, avoiding the need for three-phase wiring.

Cleaning involves wiping the control panel and selector switch with a damp cloth; the bulb and capillary should be kept free of grease and debris to ensure accurate temperature readings. The D-shaped pin connector should be checked periodically for a snug fit to prevent electrical faults.

This thermostat is a direct replacement for LF and compatible models requiring a single-phase, 50–320 °C temperature control with an auxiliary selector switch. It is listed in the catering equipment controls section of the catalogue.