Introduction
This manual provides essential instructions for the safe and efficient operation, installation, maintenance, and troubleshooting of your MOUNTO DH165 LGR Commercial Dehumidifier. Please read this manual thoroughly before operating the unit and retain it for future reference.

Image: MOUNTO DH165 LGR Commercial Dehumidifier, a blue and gray unit with wheels and a handle.
Important Safety Information
Always follow basic safety precautions when using electrical appliances to reduce the risk of fire, electric shock, or injury. This unit is designed for commercial and industrial use. Ensure proper grounding and ventilation.
- Do not operate the unit with a damaged cord or plug.
- Do not use the unit near water or in excessively wet conditions.
- Ensure the unit is placed on a stable, level surface.
- Keep children and pets away from the operating unit.
- Unplug the unit before performing any maintenance or cleaning.
Key Features
- Powerful Moisture Removal: Removes up to 310 PPD (pints per day) at saturation and 165 PPD at AHAM conditions.
- Energy Efficient: Consumes only 10.5A of power with a COP of 2.9 L/Kwh.
- Built-In Condensate Pump: Features a 15-foot lift head for continuous drainage, eliminating manual emptying. Includes a 25ft drain hose.
- Advanced Digital Controls: Automatic digital humidistat control, real-time inlet/outlet temperature and relative humidity display.
- Automatic Restart & Memory Function: Resumes operation with last saved settings after power outages.
- Portable Design: Heavy-duty construction with large, non-marking wheels for easy transport over various surfaces and thresholds.
- Washable Filter: Durable metal mesh filter for easy maintenance.

Image: Visual representation of key features including automatic operation, auto defrost, memory restart, and humidity setting range (20%-90% RH).

Image: Illustration of LGR (Low Grain Refrigerant) technology, demonstrating effective moisture removal and humidity reduction.
Setup Instructions
- Unpacking: Carefully remove the dehumidifier from its packaging. Inspect the unit for any shipping damage. Retain packaging for future transport or storage.
- Placement: Position the dehumidifier in a central location within the area to be dehumidified. Ensure there is at least 1 foot (30 cm) of clear space around all sides for proper airflow. Avoid placing the unit against walls or furniture that could obstruct air intake or exhaust.
- Drainage Setup:
- Locate the drain hose (25ft provided) and connect it to the unit's drain outlet.
- Direct the other end of the drain hose to a suitable drainage point, such as a floor drain, sink, or a larger container. The built-in condensate pump can lift water up to 15 feet vertically, allowing for flexible drainage options.
- Ensure the drain hose is not kinked or obstructed to allow for continuous water flow.

Image: Diagram illustrating the built-in condensate pump, showing the 25ft drain hose and its ability to drain water with a 15ft vertical lift.

Image: Close-up view of the drain pipe connection and the indicated 15ft drain height capability.

Image: The included drain hose and power cord, showing how they can be stored or connected.
- Power Connection: Plug the power cord into a grounded electrical outlet (120V AC).
- Handle Adjustment: The unit features a retractable handle for easy transport. Pull out the knobs on each side of the handle, turn them to unlock, and then lift the handle to the desired height. Push and turn the knobs to lock the handle in place.
- Filter Check: Ensure the washable metal mesh filter is properly installed before operation. It is located behind the metal grille.

Image: The dehumidifier's handle and large wheels, designed for easy movement.
Operating Instructions
Control Panel Overview
The unit is equipped with an intuitive digital control panel. It displays real-time inlet and outlet temperature and relative humidity (RH) readings.

Image: Close-up of the digital control panel, showing the display for temperature and humidity, along with control buttons (Pump, On/Off, Set).
Basic Operation
- Power On/Off: Press the Power button on the control panel to turn the unit on or off.
- Setting Desired Humidity: Use the '+' and '-' buttons to adjust the target relative humidity. The unit will operate automatically to maintain this level (range: 20%-90% RH).
- Continuous Drainage: With the drain hose connected, the unit will automatically pump out collected water.
- Manual Pump Activation: If you need to manually drain the internal reservoir, press the 'Pump' button on the control panel. The pump will activate to empty the collected water.
- Automatic Restart: In case of a power interruption, the unit will automatically restart with its previous settings once power is restored.
- Auto Defrost: The unit features an automatic defrost function to prevent ice buildup on the coils, ensuring efficient operation in cooler environments.
Maintenance
Filter Cleaning
Regular cleaning of the air filter is crucial for maintaining the dehumidifier's efficiency and lifespan. The unit uses a washable metal mesh filter.
- Accessing the Filter: The filter is located behind the metal grille on the side of the unit. Carefully remove the grille to access the filter.
- Cleaning: Wash the filter with warm, soapy water. Rinse thoroughly and allow it to air dry completely before reinstallation. Do not use harsh chemicals or abrasive materials.
- Reinstallation: Once dry, place the filter back into its slot and secure the metal grille.

Image: Internal view of the dehumidifier, highlighting the coils and fan assembly, which are protected by the filter.
Unit Cleaning and Storage
- Wipe the exterior of the unit with a soft, damp cloth.
- Before storing, ensure the unit is completely dry. Perform a manual drain to empty any remaining water from the internal reservoir and pump system.
- Store the dehumidifier in a cool, dry place, protected from dust and extreme temperatures.
Troubleshooting Guide
If your dehumidifier is not operating correctly, consult the following common issues and solutions before contacting support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not turn on | No power supply; Power cord not securely plugged in; Circuit breaker tripped. | Check power outlet; Ensure cord is firmly plugged in; Reset circuit breaker. |
| Unit is running but not collecting water | Humidity level is already low; Air filter is clogged; Room temperature is too low; Unit is in defrost mode. | Check ambient humidity; Clean the air filter; Ensure room temperature is above 40°F (5°C); Allow defrost cycle to complete. |
| Water is leaking | Drain hose is kinked, clogged, or improperly connected; Unit is not level. | Inspect and clear the drain hose; Ensure secure connection; Place unit on a level surface. |
| Unusual noise during operation | Loose parts; Unit not on a stable surface; Fan obstruction. | Check for loose components; Ensure stable placement; Inspect fan for obstructions (unplug first). |
Specifications

Image: Diagram showing the physical dimensions and key performance metrics of the dehumidifier.
| Feature | Detail |
|---|---|
| Brand | MOUNTO |
| Model Name | LGR165 |
| Model Number | DH165 |
| Capacity (Saturation) | 310 Pints/day |
| Capacity (AHAM) | 165 PPD |
| Dehumidification Capacity | 38.75 Gallons per Day |
| Floor Area Coverage | 5000 Square Feet |
| Color | Blue |
| Special Features | Automatic Restart, Built-In Pump, LGR Dehumidifier, Portable with large wheels |
| Tank Volume | 10 Pints (internal reservoir, primarily for pump operation) |
| Product Dimensions (D x W x H) | 22"D x 23"W x 35"H |
| Number of Speeds | 2 |
| Recommended Uses | Water Damage Restoration, Basement, Greenhouse, Commercial, Industrial |
| Included Components | Built-in Pump, 25ft Drain Hoses |
| Wattage | 1150 watts |
| Operation Mode | Continuous |
| Air Flow Capacity | 550 Cubic Feet Per Minute (CFM) |
| Upper Temperature Rating | 100 Degrees Fahrenheit |
| Voltage | 120 Volts (AC) |
| Item Weight | 125 Pounds |
| Material | Roto-Molded Plastic Housing |
| UPC | 766287106001 |

Image: Examples of suitable environments for the dehumidifier, including residential, commercial, and industrial settings.
Warranty and Support
For warranty information, technical support, or service inquiries, please contact MOUNTO customer service. Refer to the product packaging or the official MOUNTO website for the most current contact details.
Protection plans are available for extended coverage. Please refer to your purchase documentation for details on available plans and how to enroll.