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