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All installations and services must be performed by qualified service personnel.
7
1. Utility Room (example of a confined space)
In buildings of unusually tight construction, such as those wherein weather
stripping and storm sash windows are used, two (2) permanent openings
connecting to a well-ventilated crawl space, attic, or with the outdoors
shall be provided. Each opening shall have a minimum free area of one
(1) square inch per 1000 BTUH of total input rating of all appliances to be
installed in the utility room. One opening should be located near, or in, the
ceiling of the room and the other should be located near, or in, the floor.
2. Full Basement (example of an unconfined space)
Where a furnace is installed in a full basement, infiltration is normally
adequate to provide air for combustion and ventilation.
When an opening in the outside wall must be provided, it should be furnished
with properly screened metal sleeves.
If an exhaust fan, or additional fuel burning appliances, are present in the
furnace room, there should be increased concern about providing adequate
airflow to the furnace. Additional efforts may be required to assure an adequate
supply of combustion and ventilation air is available to the furnace under all
conditions.
F. MDA1 Horizontal Installation
:
The auxiliary limit switch must be relocated in accordance with the
following instructions when installing this furnace horizontally.
:
DO NOT hang the horizontal / counterflow furnace from a structure
or surface by any integral part or fastener of the furnace. The furnace
was not designed to support itself in this manner.
The MDA1-50, 75, 100, and 125 furnaces may be installed in a horizontal
position by placing the furnace on the left or right side (as viewed from the front
in the upright position).
If the unit is placed on its right side the auxiliary limit switch located on the right
side of the house air blower must be moved to the opposite (left) side of the
blower (refer to Figure 2).