Skip Ribbon Commands
Skip to main content



Pipe thermostat for automatic heat/cool changeover

Product Description

Surface mounting thermostat for applications with hot water storage cylinders or water pipes.
For temperature control of hot water storage cylinders, high and low temperature limiting on water pipes, and automatic heat/cool changeover for 2-pipe fan-coil systems.

Technical Properties

Mounting place strap on pipe
Suitable for low limit or H/C changeover
Approvals CE
ErP Class I
Temperature element bimetal
Tamperproof cover supplied
Temp. setpoint range 2 ... 40 oC
Differential fixed 10 oC
Switch function/capacity SPDT 230Vac, 4 A resistive, 2 A inductive
Housing (HxWxD) 79 mm | 44 mm | 54 mm
Protection class IP30
Wiring connection Screw terminals (x3)
Terminal max. wire size 1,5 mm2
Media temp. 0 ... 95 oC
Ambient temperature 0 ... 70 oC
Additional Descriptions Thermostat delivered with mounting strap for cylinders (L641A) or mounting springs for pipes (L641B).
  • A manual setting knob is supplied with L641A.
  • A tamperproof cover is supplied with L641B.