Bard WH421 Installation Instructions Manual

Also see for WH421: Specifications Installation instructions

Manual 2100-399Page 7INSTALLATION INSTRUCTIONSWALL MOUNTING INFORMATION1. Two holes, for the supply and return air openings,must be cut through the wall as shown in Figure 3.2. On wood-frame walls, the wall construction must bestrong and rigid enough to carry the weight of theunit without transmitting any unit vibration. SeeFigures 4 and 5.WARNINGFire hazard can result if 1/4 inch clearance tocombustible materials for supply air duct is notmaintained. See Figure 3.3. Concrete block walls must be thoroughly inspected toinsure that they are capable of carrying the weight ofthe installing unit. See Figure 4.MOUNTING THE UNIT1. These units are secured by wall mounting bracketswhich secure the unit to the outside wall surface atboth sides. A bottom mounting bracket is providedfor ease of installation, but it is not required.2. The unit itself is suitable for “0” inch clearance, butthe supply air duct flange and the first 3 feet ofsupply air duct require a minimum of 1/4 inchclearance to combustible material. If a combustiblewall, use a minimum of 30-1/2" x 10-1/2"dimensions for sizing. However, it is generallyrecommended that a 1 inch clearance is used for easeof installation and maintaining the required clearanceto combustible material. The supply air openingwould then be 32" x 12". SeeFigures 3, 4 and 7 for details.WARNINGFailure to provide the 1/4 inch clearancebetween the supply duct and a combustiblesurface for the first 3 feet of duct can result infire.3. Locate and mark lag bolt locations and bottommounting bracket location. See Figure 4.4. Mount bottom mounting bracket.5. Hook top rain flashing under back bend of top. Toprain flashing is shipped secured to the right side ofthe back.6. Position unit in opening and secure with 5/16 lagbolts; use 7/8 inch diameter flat washers on the lagbolts.7. Secure rain flashing to wall and caulk across entirelength of top. See Figure 3.8. For additional mounting rigidity, the return air andsupply air frames or collars can be drilled andscrewed or welded to the structural wall itself(depending upon wall construction). Be sure toobserve required clearance if combustible wall.9. On side by side installations, maintain a minimum of20 inches clearance on right side to allow access toheat strips and control panel, and to allow properairflow to the outdoor coil. Additional clearance maybe required to meet local or national codes.TYPICAL INSTALLATIONSSee Figure 6 for common ways to install the wall-mountunit.