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Little Giant VCMX-20UL - User Manual

Little Giant VCMX-20UL
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OWNER'S MANUAL
English
EN
VCMX CONDENSATE PUMP SERIES
This pump automatically removes condensate water that drips from an air conditioner evaporator coil,
refrigeration equipment coil, condensing furnace, or condensing boiler. The pump is controlled by a float
switch mechanism, which automatically starts and stops
the pump.
Some models also include a high-water level switch, which
opens a thermostat circuit when the pump reservoir is full,
stopping production of condensate. Alternatively, this
switch can be reconfigured to close a circuit, which can
operate an external alarm or relay, (purchased separately).
This product is covered by a Limited Warranty for a period
of 36 months from the date of original purchase by the
consumer. For complete warranty information, refer to www.LittleGiant.com
.
Specifications
SAFETY INSTRUCTIONS
Before Getting Started
This equipment should be installed and serviced by technically qualified personnel who are familiar with
the correct selection and use of appropriate tools, equipment, and procedures. Failure to comply with
national and local electrical and plumbing codes and within Little Giant recommendations may result in
electrical shock or fire hazard, unsatisfactory performance, or equipment failure.
Know the product’s application, limitations, and potential hazards. Read and follow instructions carefully to
avoid injury and property damage. Do not disassemble or repair unit unless described in this manual.
Failure to follow installation or operation procedures and all applicable codes may result in the following
hazards:
Model Volts HZ Amps Watts Shut Off
VCMX-20 Series 115 60 1.5 93 21’ (6.4 m)
VCMX-20 Series 230 50/60 0.7/0.6 75 20’ (6.1 m)
Risk of death, personal injury, or property damage due to explosion,
fire, or electric shock.
Do not use to pump flammable or explosive fluids such as gasoline, fuel oil, kerosene, etc.
Do not use in explosive atmospheres or hazardous locations as classified by the NEC, ANSI/NFPA70.
Do not handle a pump or pump motor with wet hands or when standing on a wet or damp surface, or in water.
When a pump is in its application, do not touch the motor, pipes, or water until the unit is unplugged or electri-
cally disconnected.
If the power disconnect is out of sight, lock it in the open position and tag it to prevent unexpected application of
power.

Questions and Answers

  • R
    Richard GomezJul 25, 2025
    What to do if my Little Giant VCMX-20UL condensate is overflowing?
    • R
      Robert MartinJul 25, 2025
      If condensate is overflowing from the tank of your Little Giant Water Pump, start by ensuring the pump is connected to electrical power using a dedicated GFCI circuit. The overflow could also be due to the liquid inflow exceeding the pump's output capacity, suggesting a larger pump is needed. Make sure the pump is level on a flat surface, as an unlevel pump may not activate. Clean the float to remove any debris. Inspect the check valve for proper operation and clear any blockages in the outlet tubing or impeller housing. If the high level switch is connected to the A/C unit (or alarm circuit), ensure that the leads are connected to the correct switch terminals for the application. If none of these solutions work, the switch or motor may be defective and require pump replacement.
  • W
    weeksrichardJul 30, 2025
    How to fix a Little Giant VCMX-20UL that won't shut off?
    • A
      Alan FischerJul 30, 2025
      If your Little Giant Water Pump won't shut off, first check for any obstructions in the float's movement path and remove any debris. The liquid inflow might also exceed the pump's output capacity, indicating a need for a larger pump. Ensure that the pump high level switch is connected to the A/C unit (or alarm circuit), and that the leads are connected to the correct switch terminals for the application. If these steps don't resolve the issue, the switch may be defective, and the pump may need replacement.
  • D
    Darren WhiteAug 4, 2025
    What causes continuous cycling in a Little Giant VCMX-20UL Water Pump?
    • R
      Richard SchmidtAug 4, 2025
      If your Little Giant Water Pump cycles continuously, the check valve might be leaking. Remove the check valve and inspect for proper operation.
  • D
    davisjaredAug 9, 2025
    Why my Little Giant VCMX-20UL doesn't start when the tank is full?
    • K
      Katherine WilliamsAug 10, 2025
      If your Little Giant Water Pump isn't starting even when the tank is full of condensate water, there could be several reasons. First, ensure the pump is properly connected to a dedicated GFCI circuit. Check if the circuit breaker is off or if a fuse has been removed, and if so, turn the breaker on or replace the fuse. Debris or build-up on the float can also cause this issue, so clean the float to ensure it's not too heavy to operate correctly. Also, check for any obstructions in the float's movement path and remove them. If none of these steps work, the switch or motor might be defective, requiring pump replacement.
  • S
    Samantha PenningtonAug 14, 2025
    Why does my Little Giant VCMX-20UL Water Pump run but not pump water?
    • M
      Monique HansonAug 14, 2025
      If your Little Giant Water Pump runs but doesn't discharge liquid, the check valve might be stuck or plugged, so remove it and inspect its operation. Also, the lift might be too high for the pump's capacity, so check the rated pump performance. Another cause might be a plugged inlet to the impeller, requiring you to pull the pump and clean it. Finally, check the outlet tubing for any obstructions, such as kinks or debris, and clear them.
  • J
    Jack HowardAug 20, 2025
    Why Little Giant VCMX-20UL Water Pump does not deliver rated capacity?
    • K
      Kimberly PalmerAug 20, 2025
      If your Little Giant Water Pump isn't delivering its rated capacity, start by checking the check valve for any obstructions. If it is stuck or plugged, remove it and inspect it for proper operation. The pump lift may be too high, so check the rated pump performance. Also, verify that the supply voltage matches the nameplate rating. Lastly, inspect the impeller and discharge pipe for clogs, and clean them if necessary, checking the pipe for scale or corrosion as well.

Summary

Specifications

Safety Instructions

Before Getting Started

Guidelines for safe installation and operation before commencing work.

Installation

Physical Installation

Guidance on mounting the pump securely and ensuring proper placement.

Piping Connections

Instructions for connecting inlet and outlet piping, including drain line routing.

Electrical Connections

Procedures for safely connecting the pump to a power source and circuit.

Maintenance

Operation Testing

Steps to test the pump's operating switch and high-level switch.

Routine Maintenance

Procedures for inspecting and cleaning the pump and its components.

Troubleshooting

Little Giant VCMX-20UL Specifications

General IconGeneral
ModelVCMX-20UL
CategoryWater Pump
TypeSubmersible Utility Pump
Voltage115V
Cord Length10 ft
Safety ListingsUL Listed
MaterialPlastic
Switch TypeFloat

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