Little Giant VCMA-20 Manuel De L'opérateur page 6

INSTALLATION
Electrical Connections
High Water Level Switch Connection
Risk of bodily injury or property damage.
• In applications where property damage and/or personal injury might result from an inoperative or leaking pump
due to power outages, discharge line blockage, or any other reason, a backup system(s) (e.g. auxiliary switch)
and/or alarm should be used and monitored.
• The high level switch should be connected to a Class II Low Voltage circuit. The two switch wires are black. Do not
confuse these wires with the line voltage power conductors.
• The high level switch is placed in an orientation that reverses the normal function of normally open and normally
closed terminals. Pay close attention to the following instructions.
1. High Water Level Switch
2. NC terminal. Connect here to activate an external alarm or relay.
3. NO terminal. Connect here to shut off the condensing unit of the heating/cooling system.
4. Motor Cover and Screw
5. Thermostat
6. Air Conditioner/Furnace
7. High Water Level Switch wiring leads
There are two options for connecting the high level switch:
1. The switch is factory wired to the NO and COM terminals. This configuration will open (break) an
electrical circuit when the switch is activated by a high water level in the reservoir, which can be
used to stop the condensing unit(s) of the heating/cooling system.
• Refer to the thermostat and heating/cooling unit's Operating Manual for expected switch opera-
tion and wiring connections. Connect the switch leads (7) in series with the low voltage thermo-
stat circuit as specified in the heating/cooling unit's operating manual.
2. The installer can reconfigure this switch to the NC terminal to close a low voltage circuit in the event
of high water level, which could activate an external alarm or relay (purchased separately). Use the
following procedure if an NC configuration is required:
• Remove the pump's motor cover (4).
• Support the switch and carefully change the lead wire from the NO terminal to the NC terminal
(3).
• Re-install the motor cover.
• Connect the switch leads in series with the low voltage external component as specified in the
component's manual.
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