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, mark the position and size, and remove
just enough insulation to allow the HTS3 to
fi
t
against the metal of the cylinder in the recess
formed.
Wiring Connections
From the wiring centre or junction box, run
suf
fi
cient 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 Earth
connection is necessary.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
fi
xing 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.
WARNING
Disconnect mains supply before
fi
tting or removing the cover.
A switch having contact
separation of at least 3mm in all
poles must be incorporated in the
fi
xed wiring as a means of providing
full disconnection of the mains
supply.
