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L641 SURFACE CONTACT THERMOSTAT
Summer/Winter
Changeover for 2-pipe
Fan-Coil Units
WIRING DIAGRAMS
L641A1039
DHWS ControL
Timer
Heating Load
Terminal 2 used on Honeywell
Y-Plan systems
L641B1004
Low Limit
(Frost
Protection)
Connected to override existing
time and temperature controls
Honeywell Control Systems Limited
Newhouse Industrial Estate
Motherwell ML1 5SB
United Kingdom
EN0R 8444
Set to
o
25
C
L641B1012
L641B1020
High Limit
Heating Load and
existing controls
Contacts C and 1 break on
temperature rise
Contacts C and 1 make on
temperature fall
Set to
25
L641B1004 Automatic
Summer/Winter Changeover
XE90
L641B1004 Automatic Summer/
Winter Changeover XE70 series
Typical wiring
XE70 Series
Helping You Control Your World
o
C
Note:
For wiring details
refer to the
appropriate XE70
or XE90 Product
Data sheet.
(ENOR8402, 8403,
8406)
Fan coil
Unit
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