Improper installation, adjustment, alteration, service, mainte- nance, or use can cause carbon monoxide poisoning, explo- sion, fire, electrical shock, or other conditions which may cause personal injury, loss of life, or property damage. Consult a qualified installer, service agency, local gas sup- plier, or your distributor or branch for information or assis- tance. The qualified installer or agency must use only factory-authorized and listed kits or accessories when modi- fying this product. A failure to follow this warning could result in electrical shock, fire, personal injury, or death.
For high-altitude installation, the high-altitude conversion kit must be installed at or above 5500 ft above sea level.
For accessory installation details, refer to applicable installation literature.
NOTE: Remove all shipping brackets and materials before oper- ating furnace.
Step 1—Location
GENERAL
DO NOT install furnace in a corrosive or contaminated atmosphere. Make sure all combustion and circulating air requirements are followed.
DO NOT use this furnace during construction when adhe- sives, sealers, and/or new carpets are being installed and curing. If the furnace is required during construction, use clean outside air for combustion and ventilation. Compounds of chlorine and fluorine when burned in combustion air form acids which will cause corrosion of the heat exchangers and metal vent systems. Some of these compounds are released from paneling and dry wall adhesives, paints, thinners, masonry cleaning materials, and many other solvents com- monly used in the construction process.
Excessive exposure to contaminated combustion air will result in safety and performance related problems.
This furnace must be installed so electrical components are protected from water.
Locate furnace as near to center of air distribution system and chimney or vent as possible. The furnace should be installed as level as possible.
When furnace is installed so that supply ducts carry air to areas outside space containing furnace, the return air must also be handled by a duct(s) sealed to furnace casing and terminating outside space containing furnace.
Provide ample space for servicing and cleaning. Always comply with minimum fire protection clearances shown on unit clearance label. This furnace shall not be installed directly on carpeting, tile, or any combustible material other than wood flooring. The furnace may be installed on combustible flooring when installed with accessory downflow subbase, which is available from your dis- tributor or branch when required.
LOCATION RELATIVE TO COOLING EQUIPMENT
The cooling coil must be installed parallel with or on downstream side of furnace to avoid condensation in heat exchangers. When installed parallel with furnace, dampers or other means used to control the flow of air must prevent chilled air from entering furnace. If dampers are manually operated, they must be equipped with means to prevent operation of either unit unless damper is in full-heat or full-cooling position.
HAZARDOUS LOCATIONS
When furnace is installed in a residential garage, it must be installed so that burners and ignition source are at least 18 in. above floor. The furnace should be protected from physical damage by vehicles.
When furnace is installed in public garages, airplane hangars, or other buildings having hazardous atmospheres, unit must be installed in accordance with recommended good practice require- ments of the National Fire Protection Association, Inc.
→Step 2—Air for Combustion and Ventilation
Provisions for adequate combustion and ventilation air must be provided in accordance with Section 5.3, Air for Combustion and Ventilation, of the NFGC or applicable provisions of local building codes.
Canadian installations must be in accordance with NSCNGPIC and all authorities having jurisdiction.
Air for combustion must not be contaminated by halogen compounds which include fluoride, chloride, bromide, and iodide. These elements are found in aerosol sprays, deter- gents, bleaches, cleaning solvents, salts, air fresheners, and other household products.
The operation of exhaust fans, kitchen ventilation fans, clothes dryers, or fireplaces could create a negative air pressure condition at the furnace. Make-up air must be provided for these devices, in addition to that required by the furnace.
All fuel-burning equipment must be supplied with air for combus- tion of the fuel. Sufficient air MUST be provided to ensure there will not be a negative pressure in equipment room or space. In addition, a positive seal MUST be made between furnace cabinet and return-air duct to avoid pulling air from the burner area and draft safeguard opening into circulating air.
The requirements for combustion and ventilation air depend upon whether furnace is located in a CONFINED or UNCONFINED space.
UNCONFINED SPACE
An unconfined space must have at least 50 cu ft for each 1000 Btuh of input for all appliances (such as furnaces, clothes dryer, water heaters, etc.) in the space.
For Example:
58TMA FURNACE | MINIMUM SQ FT |
HIGH-FIRE INPUT | WITH |
BTUH | 7-1/2 FT CEILING |
63,000 | 420 |
84,000 | 560 |
105,000 | 700 |
123,000 | 820 |
If space is constructed unusually tight, air for combustion and ventilation MUST come from either the outdoors or spaces freely communicating with outdoors. Combustion and ventilation open- ings must be sized the same as for a confined space as defined below. Return air must not be taken from the room unless equal or greater amount of air is supplied to the room.
CONFINED SPACE
A confined space is defined as a space whose volume is less than 50 cu ft per 1000 Btuh of total input ratings of all appliances
