Little Giant VCCA-20ULS Owner's Manual page 4

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.
• This pump is equipped with a safety switch. Connect to a Class 2 Low Voltage circuit only. The two switch wires
are black. Do not confuse these wires with the line voltage power conductors.
• The high water level safety 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 water level switch:
1. The switch is factory wired to the NO and COM terminals. This will open (break) a low voltage elec-
trical circuit when the switch is activated by a high water level in the reservoir. This 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 thermostat circuit as
specified in the manual.
2. The switch can be reconfigured to the NC terminal to close a low voltage circuit in the event of high
water level, activating an external alarm or relay (purchased separately). Use the following proce-
dure if an NC configuration is required:
• Disconnect the pump from the power source.
• Remove the pump's motor cover (4).
• Support the switch and carefully change the lead 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.
Place the included "Attention Service Technician" label in a visible location.
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