Condensation Pump Install

What You Need to Know

When installing a MRCOOL HVAC system, it’s important to consider how condensation will be drained. Most MRCOOL units rely on gravity-based drainage, and a condensation pump is optional for DIY units. However, if gravity drainage is not feasible—such as when the drain line must be routed upward—a condensation pump is necessary. The only MRCOOL unit with a built-in condensation pump is our cassette system.

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Compatible Condensation Pumps for MRCOOL Systems

For MRCOOL units requiring a pump-assisted drainage solution, compatible options include:

• Gobi II Condensate Pump

• Aspen Mini Condensate Pump

These pumps efficiently remove condensate from the system, ensuring proper drainage and preventing potential water damage or system malfunctions.

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How to Wire a Condensation Pump

Proper wiring of a condensation pump is crucial to its operation. Below is a general guide for connecting a condensation pump to your HVAC system:

1. Turn Off Power

Before beginning any electrical work, ensure the power to your HVAC system is turned off to avoid electrical hazards.

2. Locate the Power Source

Determine the power source for the pump. This can be either a nearby electrical outlet or a dedicated circuit from the HVAC system.

3. Connect the Power Wires

Most condensation pumps have a standard power cord that can be plugged into an electrical outlet. If hardwiring is required, follow these steps:

• Connect the black (hot) wire to the corresponding hot wire from the power source.

• Connect the white (neutral) wire to the neutral wire.

• Connect the green (ground) wire to the ground connection.

4. Wire the Safety Switch

Many condensation pumps include a built-in safety switch designed to shut off the HVAC system if the pump fails. To wire the safety switch:

• Identify the red (R) wire on the thermostat circuit.

• Connect the safety switch in series with this wire, following the manufacturer’s instructions.

• This will ensure that in the event of a pump failure, the system will shut down to prevent overflow or damage.

5. Secure the Wiring

• Use wire nuts to secure all electrical connections.

• Wrap connections with electrical tape for added safety.

• Ensure there are no exposed wires that could lead to short circuits or electrical hazards.

6. Test the Pump

Once all wiring is secured, restore power and perform a test:

• Pour water into the pump’s reservoir.

• Verify that the pump activates and drains the water properly.

• Ensure the safety switch functions correctly by manually triggering it and checking that the HVAC system shuts off.

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Final Considerations

• Always refer to the installation manual provided with the condensation pump for model-specific wiring instructions.

• If you are unsure about any step of the process or uncomfortable working with electrical connections, it is recommended to hire a professional technician.

By ensuring proper installation and wiring of a condensation pump, you can prevent drainage issues and maintain the efficiency of your MRCOOL system.