Stuart Turner Float Switch User Manual

FLOAT SWITCH

OPERATING INSTRUCTIONS

Please leave this instruction booklet with the pump as it

contains maintenance and safety information

(Original Instructions)

MODELS F1 20/8

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page No

Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Limits of Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Technical Specifi cations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Typical Switch Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pre-Assembly of Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Siting of the Switch & Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Electrical Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

IMPORTANT NOTES

 Please read these instructions fully before starting the

installation:

 The installation must comply with the relevant water supply,

electrical and building regulations and be installed by a
competent person.

 If in doubt, consult Stuart Turner Ltd.

APPLICATION

Stuart float switches are suitable for operation in most water based liquids and provide
automatic control of electrically driven pumps of all types. They can be used for direct
switching of small single phase motors with built in thermal overload protection. They can
also be used to switch larger motors via a contact starter.

WARNING AGAINST MISUSE

 This switch must not be used for any other application without the

written consent of Stuart Turner Limited.

 This appliance is not intended for use by persons (including children)

with reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given supervision
or instruction concerning use of the appliance by a person responsible
for their safety.
Children should be supervised to ensure that they do not play with the
appliance.

- 2 -

Cont ...

PRODUCT DESCRIPTION

The switch consists of a polypropylene casing, brass counterbalance weights, nylon float
cord and polystyrene float.

The electrical contact is made using mechanical micro switches which are suitable for
operation on voltages up to 250V AC. The switch operation is achieved by the rocking
motion of the arm caused by the rise and fall of the float.

LIMITS OF APPLICATION

Maximum liquid temperature 50oC

Minimum liquid temperature 4

Maximum ambient air temperature 50

o

C

o

C

TECHNICAL SPECIFICATIONS

Gross

Model

F1 20/8 250V a.c. 20 amp 8 amp

Max

Voltage

Current Rating Type

Resistive Inductive H W L Dia L

Single

Pole

Enc.

Rating

IP22 59 56 132 63 125 0.6

Dims (Switch) Dims (Float)

Weight

(packed)

kg

Stuart Turner reserve the right to amend the specification in line with its policy of
continuous development of its products.

- 3 -

TYPICAL SWITCH INSTALLATIONS

High level cut out (tank filling)

Low level cut out (tank emptying)

Fig. 1

Fig. 2

NOTE : Different positions of float and counter balance, relevant to the operation the
switch is required to carry out.

- 4 -

Cont ...

Two switch installation (providing low level cut out protection)

FLOAT SWIT CH 2

FLOAT SWITC H 1

FUSE
L
N
E
SUPPLY 220/240-1PH-AC

WATER SUPPLY

OUTLET

NOTE:D.O.L. SWITCHING RECOMMENDED

FOR MOTORS UP TO 370 WATT THAT ARE

PROTECTED BY AN INTEGRAL THERMAL TRIP

N1

N1 L2 L1N2

L2 L1N2

FLOAT SWIT CH 1

Fig. 3

FLOAT SWITC H 2

MOTOR

WATER SUPPLY

INLET

Fig. 4

For installations where an erratic water supply can be a problem, two switches can be
used as illustrated. Float switch 2 is controlling the start and stopping of the pump, whilst
float switch 1 is providing low level protection by preventing the operation of the pump in
the case of water shortage.

- 5 -

Cont ...