EN0R8444
L641
SURFACE CONTACT
THERMOSTAT
PRODUCT DATA
FEATURES
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Versions available for use as a cylinder thermostat
in domestic hot water installations
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Versions available for use as a pipe thermostat in
fan-coil applications
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Version available for use as a pipe thermostat in
frost protection applications
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Version available for use as a pipe thermostat to
limit the supply water temperature in underfloor
heating and solid fuel systems
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The S.P.D.T. switching action is accomplished by a
snap-action MICRO SWITCH which is actuated by a
bimetal temperature sensing element
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The desired temperature control point is set by the
clearly scaled temperature selector on the front
cover
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Wiring terminals are easily accessible
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Tamperproof temperature setting (L641B)
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Screwdriver slot temperature setting, with optional
manual setting knob supplied (L641A)
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Approvals - B.E.A.B. (meets EN 60730)
DESCRIPTION
The L641 is a surface contact thermostat designed to sense
the water temperature in storage cylinders and water pipes,
and to provide temperature control, temperature limiting, and
temperature feedback functions.
L641A mounts directly onto domestic hot water cylinders and
can be wired to directly switch a wet central heating
circulating pump, or boiler, or to operate spring return and
motor open/motor close zone valves.
L641B mounts directly onto a pipe and can provide high limit,
low limit or frost protection in wet central heating systems or
automatic summer/winter changeover in XE70 and XE90 fan-
coil control systems.