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 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.
Cont ...
- 2 -
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 |
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50oC |
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Minimum liquid temperature |
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4oC |
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Maximum ambient air temperature |
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50oC |
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TECHNICAL SPECIFICATIONS |
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Gross |
Model |
Max |
Current Rating |
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Type |
Enc. |
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Dims (Switch) |
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Dims (Float) |
Weight |
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Voltage |
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Rating |
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(packed) |
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kg |
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Resistive |
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Inductive |
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H |
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W |
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L |
Dia |
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L |
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F1 20/8 |
250V a.c. |
20 amp |
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8 amp |
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Single |
IP22 |
59 |
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56 |
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132 |
63 |
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125 |
0.6 |
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Pole |
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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)
Fig. 1
Low level cut out (tank emptying)
Fig. 2
NOTE : Different positions of float and counter balance, relevant to the operation the switch is required to carry out.
Cont ...
- 4 -
Two switch installation (providing low level cut out protection)
FLOAT SWITCH 2
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NOTE:D.O.L. SWITCHING RECOMMENDED |
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Fig. 3 |
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FOR MOTORS UP TO 370 WATT THAT ARE |
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PROTECTED BY AN INTEGRAL THERMAL TRIP |
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FLOAT SWITCH 1 |
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FLOAT SWITCH 2 |
N2 |
N1 |
L2 |
L1 |
N2 |
N1 |
L2 |
L1 |
FUSE |
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L |
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MOTOR |
N |
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E |
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SUPPLY 220/240-1PH-AC |
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WATER SUPPLY |
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OUTLET |
FLOAT SWITCH 1 |
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.
Cont ...
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