Armstrong World Industries 302, 243, 242, 122, 123, 203, 182, 183 manual

INSTALLATION Magic-Pak: HW/HWC

6-6

Installing Without a Wall Sleeve

Refer to the following directions and Figure 6-1 on page 6-5 for guidance in installing the unit without a wall sleeve:

1.Measure the size of the unit and provide an opening in an outside wall that will accept the unit. Local ordinances may require a steel lintel to support the wall above the opening. The opening must be square in all four corners.

2.Position the unit so that the grilles on the outside face of the unit are flush or extend beyond the face of the exterior wall, but not recessed more than 2" from the face of the building. Provide a support under the unit, inside the building. Make sure that the inside support does not block the return air. The unit should be installed level or pitched slightly to the outside of the building so that rain water will drain away.

3.Seal the space between the unit and building opening using a non- hardening caulking compound. The seal must be weathertight to prevent entrance of moisture and water into the building. Make sure the drain holes in the base are not plugged with caulking.

Support

In general, the wall sleeves will support the Magic-Pak HW/HWC units on any wall. The wall, however, must be adequate to support the unit. Otherwise, one must provide additional support between the unit and the floor. The center of gravity is between the bottom return-air opening rear flange and the wall sleeve. When additional support for the unit is desir- able, it should be near this center of gravity and applied evenly across the bottom of the unit through adjustable legs to the floor.

A supplementary support can be made for this purpose. It should consist of two steel channels, 28" long, one placed under the unit and one on the floor. They are separated by 3/4" pipe and “all-thread” rod, with nuts and washers, to provide the adjustment pressure. Vibration-isolation blocks or pads are also required to minimize transmission of vibration into the floor.

Even though the wall may be adequate to support the unit, experience has shown the desirability of supplementary support to reduce the possibility of vibration being transmitted into the wall and to other parts of the structure.

Two 1" diameter holes are located near the front of the Magic-Pak HW/ HWC units, on either side of the return-air opening. These holes are intended to allow a condensate drain tube to exit the return-air duct cavity whenever a closed return duct and flexible collar are used. These should not be used to support the unit. The sheet metal in the cabinet in this area is not heavy enough to act as a support without distorting and interfering with proper retention of the filter access cover.

SRM-HW/HWC

8/99