Honeywell L641A User Manual

HEATING CONTROLS
4.18
L641A/L6190B
CYLINDER THERMOSTATS
FEATURES
L641A
■
Ideal for general applications
■
Suitable for use on uninsulated
and foam lagged cylinders
■
Surface mounted
■
Double insulated
■
Dial or screwdriver slot
temperature adjustment
■
Cylinder strap & hooks
L6190B
■
Commercial construction
■
Large adjustment dial
■
Wide temperature range
■
Liquid-filled probe
■
Surface mounted
APPLICATION
The L641A Cylinder Thermostat is designed for surface mounting
on domestic hot water cylinders. It can be used to switch directly
a wet central heating circulating pump or boiler, or to operate
spring return and motor open/motor close zone valves.
The L6190B is a high limit control thermostat, which has a
tamperproof concealed adjustment. The liquid filled probe means
highly responsive temperature control.
© Honeywell Control Products and Systems, Issue 10
0014_Section 4_dft10_v4.qxd:Section 2_dft9 15/10/07 16:20 Page 37

Honeywell L641A Specifications

General

Brand	Honeywell
Model	L641A
Category	Thermostat
Language	English

Summary

Cylinder Thermostats Features

L641A Features

Ideal for general applications, suitable for uninsulated/foam lagged cylinders, surface mounted, double insulated.

L6190B Features

Commercial construction, large adjustment dial, wide temperature range, liquid-filled probe, surface mounted.

Cylinder Thermostats Application

Installation and Specifications

Installation

Instructions for horizontal or vertical mounting using provided straps, no draining required.

L641B Specification

Details switch rating, type, temperature ranges, IP rating, standards, and approvals for L641B.

L6190B Specification

Details switch rating, type, temperature ranges, IP rating, standards, and approvals for L6190B.

Ordering Specification

Provides ordering codes and settings for L641A1039 and L6190B1014 models.

Dimensions

Illustrates the physical dimensions of the thermostats with diagrams.

Wiring

Explains terminal connections for temperature rise and fall.