Drayton HTS3 Installation Instructions Manual

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HTS3 Cylinder
Thermostat

Installation instructions

Technical Data

Setting Range

50° – 80°C

Differential

8°C approx.

Switch rating

3 (1) A 230V ac

Switch type

SPDT

Earth

Double insulated
– not required

Connections

C – common
1 – call
2 – satisfied

Fixing

Plastic-coated spring wire
with hook and eyelet.

Conforms to the essential
requirements of the following directives:

2004/108/EC – Electromagnetic compat ibility

Directive

2006/95/EC – Low Voltage Directive

Cylinder thermostats

Make Model Common Call Satisfied

HTS 3 C 1 2

Lifestyle HTS 2 R B Y

Danfoss
Randall

AT (CN4) 1 2 3

Drayton CS 1/CS 2 1 2 3

Honeywell L641A C 1 2

Landis
& Gyr

RAM 1 1 2 3

Potterton
Myson

PTT 1 L H C

Sunvic 1452/

SA2451

3 1 2

Sopac SAY C 1 2

Smiths SCT 1 1 2 3

Tower CS 1 R B Y

Barlo CT 1 R B Y

Pollution Degree

2

Ball pressure

Test Temperature

110ºC

Rated impulse
voltage

2.5kV

2011/65/EU – Restriction of the Use of Certain

Hazardous Substances (RoHS)

Energy Class

I = 1% (Acc. EU
811/2013, 812/2013,
813/2013, 814/2013)

Positioning the HTS3

The HTS3 should be installed approximately one
third of the way up the hot water cylinder, and at
the front for ease of access. With pre-insulated
cylinders, mar k the position and size, and remove
just enough insulation to allow the HTS3 to fit
against the metal of the cylinder in the recess
formed.

Wiring Connections

From the wiring centre or junction box, run
sufficient 3-core electrical connecting cable to
reach the HTS3 installation position without being
under

tension.

Remove the HTS3 cover by undoing the
central retaining screw. Make wiring connections in
accordance with the diagram below and the
manufacturers instructions for associated
equipment such as motorised valves, boiler,
programmers etc. Replace and secure the cover.

The HTS3 is double insulated and no Ear th
connection is necessar y.The circuit should be
protected with a 3A fuse .

Fixing to the Cylinder

The base of the HTS3 should be held in good
contact with the metal of the hot water cylinder.

The

plastic covered spring fixing cable should
be cut to an unstretched length of
approximately 2 1/2” – 3” less than the
circumference of the cylinder and the hook and
eyelet screwed into the ends. Stretch the cable
round the cylinder, above the insulation, and
position it in the groove across the front of the
HTS3. Engage the hook and eyelet.

Common

heat

Satisfied

Cylinder

Insulation

Fixing cable

HTS3

cylinder

HTS3

height

Commissioning

The two setting marks outside the
temperature scale on the HTS3 provide max
temperature and OFF positions to assist with
commissioning or checking the system
operation. Rotate the setting arrow fully max
and anticlockwise for OFF.

Setting

With a screwdriver, position the setting arrow
at the desired nominal hot water temperature.
A popular setting is 60°C but if this is not
exactly suitable, simply adjust up or down as
appropriate.

WARNI NG

Disconnect mains supply before
fitting or removing the cover.

A switch having contact
separation of at least 3mm in all
poles must be incorporated in the
fixed wiring as a means of providing
full disconnection of the mains
supply.