Installing two float shutoffs to prevent water damage involves setting up a system that automatically cuts off the water supply when the water level reaches a certain point. This setup typically involves connecting the float switches in series to ensure that if either float detects high water levels, the water supply will be shut off. Here’s a detailed process for installing and wiring two float shutoffs:
Materials Needed:
– Two float switches (typically with normally open (NO) contacts)
– Water shutoff valve with a control board
– Appropriate wire (usually 18-22 AWG)
– Wire connectors or terminal blocks
– Screwdriver, wire stripper, and other basic tools
– Mounting hardware for the floats and control board
Step-by-Step Installation Process:
# 1. Choose the Installation Location:
– Identify the area where water damage is most likely to occur (e.g., near a sump pump, under a sink, or in a basement).
– Determine the appropriate height for the float switches. The first float should be set at a lower level to act as an early warning, and the second float should be set at a higher level as a backup.
# 2. Mount the Float Switches:
– Secure the first float switch at the lower level using the provided mounting hardware. Ensure it is firmly attached and will not move when the water level rises.
– Mount the second float switch at the higher level, following the same process.
# 3. Prepare the Wiring:
– Use wire that is suitable for the environment (e.g., water-resistant if necessary).
– Cut the wire to the appropriate length to connect the floats to the control board and the control board to the shutoff valve.
# 4. Connect the Float Switches in Series:
– Each float switch typically has three wires: a common (C), a normally open (NO), and a normally closed (NC). For this setup, you will use the common (C) and normally open (NO) wires.
– First Float Switch:
– Connect the common (C) wire of the first float switch to the power supply (usually a 24V AC or DC source).
– Connect the normally open (NO) wire of the first float switch to the common (C) wire of the second float switch.
– Second Float Switch:
– Connect the normally open (NO) wire of the second float switch to the control board.
# 5. Wire Color Scheme:
– Common (C) Wire: Typically black or white.
– Normally Open (NO) Wire: Typically red or blue.
– Example Wiring:
– Connect the black wire (C) from the power supply to the black wire (C) of the first float switch.
– Connect the red wire (NO) from the first float switch to the black wire (C) of the second float switch.
– Connect the red wire (NO) from the second float switch to the control board.
# 6. Connect the Control Board to the Shutoff Valve:
– Follow the manufacturer’s instructions for connecting the control board to the shutoff valve. Typically, the control board will have a terminal labeled for the float switch input.
– Connect the wire from the second float switch’s NO terminal to the appropriate terminal on the control board.
– Connect the control board to the shutoff valve according to the manufacturer’s instructions.
# 7. Test the System:
– Turn on the power supply and test the system by manually raising the float switches to simulate high water levels.
– Ensure that the shutoff valve closes when either float switch is activated.
– Check all connections to ensure they are secure and that there are no loose wires.
# 8. Finalize Installation:
– Secure all wiring with wire ties or conduit to prevent damage or accidental disconnection.
– Ensure the control board and shutoff valve are properly mounted and accessible for future maintenance.
Wiring Diagram:
Code :
Power Supply (24V AC/DC)
Black (C) v
First Float Switch
Red (NO) v
Second Float Switch
Red (NO) v
Control Board
(To Shutoff Valve) v
Shutoff Valve
Additional Considerations:
– Regular Maintenance: Periodically check the float switches and control board to ensure they are functioning correctly.
– Backup Power: Consider installing a battery backup for the system to ensure it operates during power outages.
– Professional Installation: If you are unsure about any part of the installation, consider hiring a professional plumber or electrician.
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