Armstrong World Industries 242, 243 Installation and Operation in Extremely Cold Weather Areas

Service Reference Manual INSTALLATION

6-15

Installation and Operation in Extremely Cold

Weather Areas

In areas where extremely cold (below – 20°F) outdoor temperatures can be expected, some additional installation and operating precautions should be taken. The following precautions are taken to prevent possible vent system ice blockage that could result in safety shutdown of the burners:

1.Adjust to the highest achievable temperature rise within the rise and static pressure ranges specified on the rating plate. Depending on specific model, it may be possible to change to a lower heating blower speed tap to get a higher temperature rise. This also increases comfort.

2.Make sure there are no leaks of outside air into the return air system.

3.Keep the outside louver grille as free as possible of any ice that may form and obstruct the flue outlet.

SRM-HW/HWC 8/99