Little Giant VCMX Series 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.
• 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 termi-
nals. Pay close attention to the following instructions.
1
1. High Water Level Switch
2. NO terminal. Connect here to shut off the condensing unit of the heating/cooling system.
3. NC terminal. Connect here to activate an external alarm or relay.
4. High Water Level Switch wiring leads
5. Switch housing tabs
6. Hinge tab
7. Switch Mounting Ribs. When installing switch, make sure it is positioned between these ribs.
8. Thermostat
9. Air Conditioner/Furnace
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 (4) 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:
• Squeeze the High Level Switch housing tabs at (5).
• Rotate the housing upwards at hinge tab (6); or, remove the housing completely by lifting the
housing hinge tab out of the slot.
• Support the switch and carefully change the lead wire from the NO terminal to the NC terminal
(3).
• Return the Switch housing back to the switch base.
• Squeeze the tabs together at (5) and insert into the switch base between ribs (7).
• 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.
4
6
5
3
7
3
8
1
2
Red
R R
White
W W
Green
G G
Yellow
Y Y
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N631