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Honeywell L641AI039, Product Data, Page: 4 / 4

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Honeywell L641AI039 Product Data Download Page 4

L641 SURFACE CONTACT THERMOSTAT

Honeywell Control Systems Limited

Helping You Control Your World

Newhouse Industrial Estate
Motherwell ML1 5SB
United Kingdom

EN0R 8444

Summer/Winter
Changeover for 2-pipe
Fan-Coil Units

Note:

For wiring details
refer to the
appropriate XE70
or XE90 Product
Data sheet.
(ENOR8402, 8403,
8406)

Set to
25

o

C

Set to
25

o

C

WIRING DIAGRAMS

L641A1039
DHWS ControL

L641B1012
L641B1020
High Limit

Terminal 2 used on Honeywell
Y-Plan systems

Heating Load

Timer

Fan coil
Unit

Heating Load and
existing controls

L641B1004 Automatic
Summer/Winter Changeover
XE90

Contacts C and 1 break on
temperature rise

L641B1004
Low Limit
(Frost
Protection)

Connected to override existing
time and temperature controls

Contacts C and 1 make on
temperature fall

L641B1004 Automatic Summer/
Winter Changeover XE70 series
Typical wiring

XE70 Series

Summary of Contents for L641AI039

Page 1: ...ector on the front cover Wiring terminals are easily accessible Tamperproof temperature setting L641B Screwdriver slot temperature setting with optional manual setting knob supplied L641A Approvals B E A B meets EN 60730 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 li...

Page 2: ...cepting wires up to 1 5 mm2 Mounting The L641A cylinder thermostat should be mounted 1 4 to 1 3 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 IMPORTANT 1 The inst...

Page 3: ...m 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 25o 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 Underfloo...

Page 4: ...t to 25o C Set to 25o C WIRING DIAGRAMS L641A1039 DHWS ControL L641B1012 L641B1020 High Limit Terminal 2 used on Honeywell Y Plan systems Heating Load Timer Fan coil Unit Heating Load and existing controls L641B1004 Automatic Summer Winter Changeover XE90 Contacts C and 1 break on temperature rise L641B1004 Low Limit Frost Protection Connected to override existing time and temperature controls Con...

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