High Water Level Switch Connection - Little Giant VCC-20ULS Manual Del Propietário

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 sys-
tem(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 elec-
trical 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 operation and
wiring connections. Connect the switch leads (7) in series with the low voltage thermostat 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 fol-
lowing 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(3) terminal to the NC terminal
(2).
• 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 "Attention Service Technician" label included with the pump on the outside of the access panel
in a visible location.
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