The LG LMHM2237BD is a 2.2 cu. ft. over-the-range microwave oven designed for installation above both gas and electric cooking equipment up to 36 inches wide. Proper installation is crucial for safe and effective operation. This article details the necessary preparations, electrical and venting requirements, and mounting procedures based on the provided installation instructions. The documentation emphasizes safety precautions throughout the installation process, including grounding requirements and avoiding damage to the appliance.
Preparing for Installation
Before commencing installation, it is important to verify all necessary parts are present. The oven is shipped with a damper/duct connector for roof or wall venting, though not all parts may be required depending on the chosen ventilation method. The model and serial number, essential for future service requests, are located on the oven front. The mounting plate is included in the upper packing materials. Users should record the model and serial numbers, as well as dealer contact information, for future reference.
Installation should ideally be performed by a qualified technician. However, the documentation provides detailed steps for those comfortable with DIY projects. It is essential to read the entire manual before beginning. A carton or other heavy material, such as a blanket, is required to protect the countertop during unpacking and preparation.
Electrical Connection Requirements
The LG LMHM2237BD requires a dedicated 120V, 60 Hz, AC electrical circuit with a 15 or 20A fused electrical supply. A grounded electrical outlet must be located in the cabinet above the oven. If a suitable outlet is not present, a qualified electrician must install one.
Warning: The documentation repeatedly emphasizes the importance of grounding to avoid electric shock. It also cautions against working on the unit without first disconnecting the power supply. Covering the edge of the power supply cord hole with the provided bushing is also a critical safety step to prevent electrical hazards.
Venting System Preparation
The LG LMHM2237BD offers three venting options: roof-venting, wall-venting, and room-venting (recirculating). The necessary ductwork for outside ventilation is not included with the oven and must be purchased separately.
For roof-venting, the documentation references Figures 7 and 9, specifying duct sizes of 3 1/4" x 10" and 6" round, respectively. For wall-venting, a rectangular-to-round adapter may be necessary if the existing duct is round, along with a rectangular 3" extension duct to prevent the exhaust damper from sticking.
The total length of the duct system, including straight sections, elbows, transitions, and wall or roof caps, must not exceed 140 feet. The documentation warns against venting the oven into wall cavities, attics, or unused areas.
For room-venting, the blower unit must be adjusted. This involves removing mounting screws and the blower plate, and cutting knockouts from the back plate.
Mounting Plate Installation
The mounting plate installation requires locating and marking wall studs. Studs are typically spaced 16 inches apart. The rear wall template should be centered using a plumb line and securely taped or tacked in place. The minimum width for the installation space is 30 inches, and the top of the template must be at least 30 inches above the cooking surface. The oven must be connected to at least one 3/16-inch hole on the wall studs or a 5/8-inch hole on drywall. The minimum mounting height is 66 inches from the floor.
Attaching the Oven to the Wall
Attaching the oven to the wall requires two people to avoid personal injury or damage to the appliance. The documentation specifically warns against applying force directly to the bottom surface of the oven, as this could damage the slide-out vent latch. The oven should be carefully set down on a flat surface during unpacking and installation.
Preparing the Blower Unit
The LG LMHM2237BD is shipped configured for roof-venting. If wall-venting or room-venting is desired, the blower unit must be adjusted. This involves removing mounting screws and the blower plate, and reassembling the blower wire. Warning: The documentation explicitly cautions against pulling or stretching the blower wiring, as this could result in electric shock.
Safety Precautions
Throughout the installation instructions, safety warnings are prominently displayed. These warnings cover a range of potential hazards, including:
- Electric Shock: The appliance must be grounded, and power must be disconnected before working on the unit.
- Personal Injury: Two people are required to lift and install the oven. Avoid applying force to vulnerable areas of the appliance.
- Property Damage: Protect countertops during unpacking and installation. Ensure proper venting to prevent moisture buildup and potential damage.
- Microwave Exposure: Do not operate the oven with the door open or tamper with safety interlocks. Do not heat baby bottles or baby food.
The documentation emphasizes the importance of saving these instructions for use by local electrical inspectors.
Conclusion
The installation of the LG LMHM2237BD microwave oven requires careful attention to detail and adherence to safety guidelines. Proper electrical connection, venting system preparation, and mounting plate installation are crucial for optimal performance and longevity. The documentation provides clear, step-by-step instructions, but it is essential to prioritize safety and consult a qualified technician if any uncertainties arise. The repeated emphasis on grounding and avoiding damage to the appliance underscores the importance of a cautious and methodical approach to the installation process.