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 fan-coil control systems.
L641
SURFACE CONTACT
THERMOSTAT
PRODUCT DATA
FEATURES
Version available for use as a cylinder thermostat in domestic hot water installations
Version available for use as a pipe thermostat in fancoil applications
Version available for use as a pipe thermostat in frost protection applications
Version available for use as a pipe thermostat to limit the supply water temperature in underfloor heating and solid fuel systems
The S.P.D.T. switching action is accomplished by a snap-action MICRO SWITCH which is actuated by a bimetal temperature sensing element
The desired temperature control point is set by the clearly scaled temperature selector on the front cover
Wiring terminals are easily accessible
Tamperproof temperature setting (L641B)
Screwdriver slot temperature setting, with optional manual setting knob supplied (L641A)
CE approved
l641-en0r8444-uk07r0515
L641 SURFACE CONTACT THERMOSTAT
SPECIFICATIONS
Supply voltage |
230 V~, 50...60 Hz |
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Switch action |
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S.P.D.T. Type 1CL |
Switch rating |
4(2) A, 230 V~ |
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Temperature |
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see table |
setting range |
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Differential |
Approximately 10 K non-adjustable |
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Surface |
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0 to 95oC |
temperature |
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range |
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Ambient temp. |
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0 to 70oC |
range |
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Mounting |
L641A mounts directly onto cylinder |
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using fixing strap provided |
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L641B mounts directly onto pipes |
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using fixing springs provided |
Dimensions |
44 x 79 x 54mm (1.73" x 3.11" x 2.13") |
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(w x h x d) |
Wiring |
3 terminals with wiring clamps, |
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accepting wires up to 1.5 mm2 |
Approvals |
L641 is CE, RoHs and WEEE |
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compliant. For regulatory information, |
DoC / CoC number D0005. Product must be wired as shown for CE compliance
DIMENSIONS
Dimensions in millimetres (inches in brackets)
ORDERING SPECIFICATION
Model |
Application |
Temperature |
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Setting Range |
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L641Al039 |
Cylinder |
Min, 40 to 80 o C |
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Thermostat |
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L641Bl004 |
Low Limit Pipe |
Min, 10 to 40o C |
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Thermostat |
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L641B1012 |
High Limit Pipe |
50 to 95oC |
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Thermostat |
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IMPORTANT
1.The installer must be a trained service engineer
2.Disconnect the power supply before beginning installation
INSTALLATION
Mounting |
Wiring |
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The L641A cylinder thermostat should be mounted 1/4 to 1/3 of |
Cover removal |
Wiring to terminals |
the way from the bottom of the domestic hot water cylinder |
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after removing a section of the insulation and cleaning the |
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surface. |
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The L641B pipe thermostat should be positioned less than |
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0.6 m (2') from the boiler, or on a supply pipe to a fan-coil |
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unit, close to the 3-port control valve. |
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l641-en0r8444-uk07r0515
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