L641 SURFACE CONTACT THERMOSTAT
3
EN0R 8444
DHW Storage
Tanks/
Cylinders
(see note 1)
High Limit
Underfloor
Heating
Systems (see
note 2)
High Limit
Solid Fuel
Systems (see
note 2)
Low Limit
Frost
Protection
(see note 3)
Fan-Coil Unit
Summer/
Winter
Changeover
for 2-pipe
units (see
note 4)
L641Al039
4
L641Bl004
4
4
L641Bl012
4
4
L641Bl020
4
4
Notes
1.
The L641A should be mounted
1
/
4
to
1
/
3
of the way from the bottom of the cylinder.
2.
The L641B should be mounted less than 0.6 m
(2') from the boiler.
3.
The L641B should be mounted on the boiler return pipe and used in conjunction with the T4360A FrostStat.
4.
The L641B should be set to approx. 25
o
C and mounted on the supply pipe close to the 3-port control valve
such as to sense the water temperature even when the valve is closed.
APPLICATION
High Limit
For Underfloor Heating
For Solid Fuel Systems
T4360A FrostStat
Limit Control in Pipes
D.H.W. Storage Cylinders
and Tanks
Low Limit
For Frost Protection of
Exposed Pipework
L641A1039
Water Temperature Sensing and
Control