JennAir downdraft cooktops require careful installation to ensure optimal performance and adherence to safety standards. This article details the installation process and ventilation requirements based on official documentation. It covers tool and part requirements, venting system specifications, and critical safety considerations for U.S. consumers and installation professionals.
Preparing for Installation
Prior to beginning installation, specific tools and parts are necessary. The documentation lists a variety of tools including tape measures, screwdrivers (flat-blade and Phillips head), drills, levels, socket extensions, markers, and pliers. A 1/4" drill bit and jigsaw are also required. Additionally, a ratchet with a 1/4" nut driver and a 3/8" socket are needed.
Parts supplied with the cooktop include the vent grille, pre-filter, plenum, plenum screw pack, and downdraft motor assembly. However, several parts must be purchased separately. These include a UL Listed or CSA Approved strain relief for knockout, a UL Listed or CSA Approved conduit connector for 1.3 cm trade-size metal-clad conduit, UL Listed wire connectors, metal ducting, and a wall cap. Two wall cap options are available: a 6" round surface wall cap damper (Part Number A406) and a 3¼" x 10" surface wall cap damper (Part Number A403). Local codes should be checked to determine acceptable materials and requirements.
Location and Dimensional Requirements
Installation requires adherence to specific location requirements and dimensions. All governing codes and ordinances must be observed. The documentation emphasizes the importance of using the countertop opening dimensions provided in the installation instructions, noting that these dimensions represent minimum clearances and provide 0" clearance. A grounded electrical supply is also required, and it is recommended that all electrical connections be made by a licensed, qualified electrical installer. Undercounter built-in ovens cannot be installed under this product.
The cooktop should be unpacked carefully, avoiding damage to the unit. The packaging foam should be used as a protective surface during installation. The access panel should be removed from the plenum using a 1/4" nut driver. Protective caps must be removed from the motor mounting posts before proceeding.
Venting System Specifications
Proper ventilation is crucial for the effective operation of a downdraft cooktop. The maximum equivalent length of the vent system is 60 ft (18.3 m). For installations at altitudes above 4,500 ft (1372 m), the recommended vent run should be reduced by 20%.
The documentation specifies the use of a 26-gauge minimum galvanized vent or a 25-gauge minimum aluminum metal vent. Poor-quality pipe fittings can reduce airflow. Flexible metal vents are not recommended. Metal ducts may be reduced to 30-gauge galvanized steel or 26-gauge aluminized steel if permitted by local codes, referencing the International Residential Codes Section M1601.1 (2006 edition). However, local codes may require a heavier gauge material.
Several restrictions apply to elbows used in the vent system. No more than three 90° elbows should be used, and two elbows should not be installed together. A minimum of 18" (45.7 cm) of straight vent must be maintained between elbows to prevent turbulence and airflow reduction. Elbows should be installed as far away as possible from the hood’s vent motor exhaust opening. A 5" (12.7 cm) elbow should not be used in a 6" (15.2 cm) or 3¼" x 10" (8.3 cm x 25.4 cm) system. Reducing the system to 5" after using larger fittings is also discouraged. Handmade crimps in the vent system should be avoided as they can restrict airflow.
The use of a vent cap is recommended for proper performance. If an alternate wall or roof cap is used, it must not reduce the cap size and should include a back draft damper. All joints in the vent system should be sealed with vent clamps, and the exterior wall or roof opening around the cap should be sealed with caulking.
Cooktop Assembly and Installation
The plenum is attached to the bottom of the cooktop using six screws from the literature pack. It is important to note that the plenum may need to be reversed if all six holes do not align. The blower motor is then placed on the plenum, rotating the blower outlet to match the ductwork. The motor is secured with four washers and locking nuts, which should be finger-tightened to allow for motor rotation. The blower electrical connector is then connected to the cooktop.
The electrical connector cover is secured to the burner box using two screws and a 1/4" nut driver. A foam strip is applied around the bottom of the cooktop to protect the glass surface and allow for a flat installation on uneven countertops. The foam strip is applied with the adhesive side down, approximately 1/4" (6.4 mm) from the edge, and any excess material is trimmed.
Installing the cooktop requires at least two people due to its weight. The cooktop is carefully lowered into the countertop opening, tilting one end in first and then lowering the other. The front edge of the cooktop should be parallel to the front edge of the countertop.
Safety Precautions
The documentation emphasizes the importance of cooktop safety. It includes standard safety warnings regarding potential hazards that can cause injury or death. A warning is provided regarding the weight of the cooktop, advising the use of two or more people during installation to prevent back injuries. General safety messages should be read and obeyed at all times.
Conclusion
Proper installation of a JennAir downdraft cooktop requires careful attention to detail, adherence to local codes, and the use of appropriate materials. Following the guidelines outlined in the provided documentation ensures optimal performance, safety, and longevity of the appliance. Key considerations include correct vent system length and material, proper elbow usage, secure electrical connections, and careful handling during installation.