Installing a Low Grain Refrigerant dehumidifier generally follows a set of straightforward mechanical and setup steps common to most commercial/industrial units. The core actions are positioning, drainage, power connection, and initial startup. If the water damage is not so serious that you can handle it yourself, you can do the following steps.

 

Step-by-Step Guide to Installing an LGR Dehumidifier

1. Unpack and Inspect

Remove all packing materials and inspect the unit for damage.

Keep installation accessories (hose, power cord, fittings) in one place.

2. Set the LGR Dehumidifier Upright

Place the LGR dehumidifier upright on a level surface before use.

If it was transported on its side or upside-down, let it stand upright:

At least 1-2 hours for most models before powering on — this allows compressor oil to settle back into place.

3. Choose the Right Location

Operate the dehumidifier in a closed/enclosed space for maximum efficiency.

Keep doors and windows closed and avoid drafts that pull moist air in.

Don’t block the air intake or discharge vents with walls or furniture — allow clear airflow around the unit.

4. Install the Drain Hose

Most LGR units collect water internally and either pump it out or gravity-drain it. LGR dehumidifiers made by Preair are equipped with a pump, drain hose. Users can connect the provided drain hose to the drain outlet on the unit. Uncoil the entire hose and avoid kinks. Then route the other end to a floor drain, a bucket, a sump, or a safe outdoor drain point.

Do not raise the hose end above the recommended height (usually ~15–20 ft/4.5–6 m), or water backup can occur.

Preair LGR units with pumps also have a quick-connect fitting for the hose to ensure it’s seated securely.

5. Apply an Air Pipe

Install a flange of appropriate size at the air outlet. 

Connect the disposable plastic air duct to the air outlet of the commercial dehumidifier. Align the other end of the air duct with the water-damaged area. It can enhance dehumidification efficiency and remove moisture deeply.

6. Connect Power

Plug the dehumidifier into a properly rated electrical outlet:

Usually 115 V, GFCI-protected outlet in the US. For the Australian market, the LGR dehumidifier requires 220-240V.

Ensure the power cord can reach without strain.

Avoid using extension cords unless rated for the load.

7. Initial Startup

Turn on the unit using the power switch on the control panel.

On many units, the compressor may delay for a few minutes on first startup — this is normal.

8. Set Desired Humidity

Adjust the desired humidity set point on the control panel if your model offers humidity control.

For constant operation, most manuals recommend setting the humidity lower (e.g., 30%).

9. Monitor Operation

During the operation of the dehumidifier, you should check that water is draining properly.

Ensure the airflow isn’t restricted and that the unit is functioning as expected.

 

Tips & Best Practices

Level Surface: Always operate the unit level and stable to protect internal components.

Airflow Clearance: Leave a few feet of clearance around the unit’s intake and discharge to maximize performance.

Check Hose Regularly: If draining to a bucket, check often to prevent overflow.

Avoid Outdoor Debris: When routing hose outdoors, ensure it’s free of blockages.

 

Safety Precautions

Do not operate the dehumidifier if it’s not upright after shipping/storage.

Only plug into a grounded outlet, ideally GFCI-protected.

Avoid placing the drain hose where water can create slip hazards.