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L641 SURFACE CONTACT THERMOSTAT
SPECIFICATIONS
: 230 V~, 50...60 Hz
Supply voltage
: S.P.D.T. Type 1CL
Switch action
: 4(2) A, 230 V~
Switch rating
: see table
Temperature
setting range
: Approximately 10 K non-adjustable
Differential
: 0 to 95
Surface
temperature
range
: 0 to 70
Ambient
temperature
range
: L641A mounts directly onto cylinder
Mounting
using fixing strap provided
L641B mounts directly onto pipes
using fixing springs provided
: 44 x 79 x 54mm (1.73" x 3.11" x
Dimensions
2.13")
(w x h x d)
: 3 terminals with wiring clamps,
Wiring
accepting wires up to 1.5 mm
DIMENSIONS
Dimensions in millimetres (inches in brackets)
INSTALLATION
Mounting
The L641A cylinder thermostat should be mounted
of the way from the bottom of the domestic hot water cylinder
after removing a section of the insulation and cleaning the
surface.
The L641B pipe thermostat should be positioned less than
0.6 m (2') from the boiler, or on a supply pipe to a fan-coil
unit, close to the 3-port control valve.
EN0R 8444
o
C
o
C
2
1
/
4
ORDERING SPECIFICATION
Model
L641Al039
L641Bl004
L641B1012
L641Bl020
IMPORTANT
1. The installer must be a trained service
engineer
2. Disconnect the power supply before beginning
installation
Wiring
1
to
/
Cover removal
3
2
Application
Temperature
Setting Range
Cylinder
Min, 40 to 80
Thermostat
Low Limit Pipe
Min, 10 to 40
Thermostat
High Limit Pipe
50 to 95
Thermostat
High Limit Pipe
40 to 95
Thermostat
Wiring to terminals
o
C
o
C
o
C
o
C
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