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Honeywell L641 Surface Contact Thermostat Instructions

4

L641

SURFACE CONTACT

THERMOSTAT

PRODUCT DATA

FEATURES

 Version available for use as a cylinder thermostat in

domestic hot water installations

 Version available for use as a pipe thermostat in fan-

coil applications

 Version available for use as a pipe thermostat in frost

protection applications

 Version available for use as a pipe thermostat to limit

the supply water temperature in underfloor heating

and solid fuel systems

 The S.P.D.T. switching action is accomplished by a

snap-action MICRO SWITCH which is actuated by a

bimetal temperature sensing element

 The desired temperature control point is set by the

clearly scaled temperature selector on the front cover

 Wiring terminals are easily accessible

 Tamperproof temperature setting (L641B)

 Screwdriver slot temperature setting, with optional

DESCRIPTION

manual setting knob supplied (L641A)

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 limiting, and

temperature feedback functions.

 CE approved

L641A mounts directly onto domestic hot water cylinders and

can be wired to directly switch a wet central heating

circulating pump, or boiler, or to operate spring return and

motor open/motor close zone valves.

L641B mounts directly onto a pipe and can provide high limit,

low limit or frost protection in wet central heating systems or

automatic summer/winter changeover in XE70 fan-coil control

systems.

l641-en0r8444-uk07r0515

https://manual-hub.com/

VIEW FULL SCREEN PDF MANUAL

General	Details
Name	Honeywell L641 Surface Contact Thermostat Instructions
Make	Honeywell
Language	English
Filetype	PDF (Download)
File size	0.15 MB

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Honeywell L641 Contact Manual: Questions and Answers

Honeywell L641 Contact specifications

Power supply	230 V~, 50...60 Hz
Differential	Approximately 10 K non-adjustable
Dimensions	44 x 79 x 54mm (1.73" x 3.11" x 2.13")

Full specifications, page 2

Can the Honeywell L641 Contact be used for frost protection in heating systems?

Yes. The L641B pipe thermostat version is available for frost protection applications and should be mounted on the boiler return pipe in conjunction with the T4360A FrostStat. Instructions, p. 3

What's the difference between L641A and L641B on the Honeywell L641?

Model	Design
L641A	Mounts directly onto domestic hot water cylinders
L641B	Mounts directly onto pipes

Instructions, p. 1

What is the switch rating of the Honeywell L641 Contact?

4(2) A, 230 V~. Instructions, p. 2

What is the temperature differential on the Honeywell L641 Contact?

Approximately 10 K non-adjustable. Instructions, p. 2

How do I mount the Honeywell L641 cylinder thermostat?

The L641A mounts directly onto the cylinder using the fixing strap provided, positioned 1/4 to 1/3 of the way from the bottom after removing insulation and cleaning the surface. Instructions, p. 2

What does the S.P.D.T. Type 1CL switch action on the Honeywell L641 Contact mean?

The thermostat uses a snap-action micro switch actuated by a bimetal temperature sensing element to provide single-pole double-throw switching. Instructions, p. 1

Honeywell L641 Contact compared with other room thermostats

Specification	Honeywell L641 Contact	BEOK TDR89	BEOK TDS75	BEOK TGW60
Power supply	230 V~, 50...60 Hz	100 ~ 240V	200 ~ 240V 50-60Hz	100 ~ 240V
Differential	Approximately 10 K non-adjustable	±1℃(Defaults adjustable 0.5-10℃)	±1℃(Defaults adjustable 0.5-3℃)	±1℃(Defaults adjustable 0.5-10℃)
Dimensions	44 x 79 x 54mm (1.73" x 3.11" x 2.13")	86x86x14mm	86x86x15mm	86x86x19mm