Stuart Turner Float Switch - Manual (Page 7)

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SITING OF THE SWITCH & INSTALLATION
WARNINGS:

When used on a sump, make sure that it is kept clean. Aggressive
mediums such as concrete dust and cinders may cause damage.

When installing the main float switch casing ensure the mounting
holes (to suit M4 screws) are used. Do not drill the switch casing as
water ingress may subsequently occur which will damage the switch.
 Do not allow plastic parts to come into contact with oil or cellulose
based paints, paint thinners or strippers, acid based descalents or
aggressive cleaning agents.
The switch housing must be securely fixed in a horizontal position and should be
protected from being sprayed with water. To permit free action of the switch, a sump
should not be less than 20 cm diameter and at least 45 cm deep. This will permit a
reasonable distance to be obtained between adjustment stops, which in turn will prevent
constant stop / start conditions which could cause damage to motor. See sketch below for
float operating range.
Float Operating Range
Install unit so that the cord, float and the counterbalance weight cannot foul or rub
against anything. The top of the float is marked ‘TOP’. It is important to fit it the right way
up. The float must slide easily up and down the cord . Control the movement of the float
by adjusting the upper and lower level stops. Ensure that when in the lower position the
float and stop weight are clear of the bottom of the sump or tank. The counterbalance
operates the switch when the float lifts up the weighted cord. When the tank is emptied,
the weighted cord plus float must overcome the counterbalance and operate the switch in
the reverse direction. A 0.92 metre nylon cord is provided as standard.
Fig. 10
70 cm Max
5 cm Min