Carrier Owners Manual - Enlarge page 1 of 8
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From inside (document excerpt):
Replacement Inducer Motor Assembly Kit Cancels: New IIK 312A-45-2 6-02 Installation Instructions Part No. 326628-760 thru 326628-765 NOTE: Read the entire instruction manual before starting the installation. SAFETY CONSIDERATIONS Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained personnel should install or service heating equipment. Untrained personnel can perform basic maintenance functions such as cleaning coils, or cleaning and replacing filters.
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All other operations should be performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels attached to the unit. Recognize safety information. This is the safety-alert symbol. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies a hazard which could result in personal injury or death. CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. Follow all safety codes. Wear safety glasses and work gloves. Have a fire extinguisher available. WARNING: Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide poisoning, explosion, fire, electrical shock, or other conditions which could result in personal injury or death. Consult your distributor or branch for information or assistance. The qualified installer or agency must use only factory-authorized kits or accessories when servicing this product. Failure to follow instructions could result in serious injury or property damage. INTRODUCTION This instruction covers the inducer motor assembly installation on non-condensing, 33.3-inch high, midefficiency hot surface ignitor units. The inducer should be replaced when the motor is seized or when the windings are, open, shorted or grounded. The motor is equipped with an internal thermal overload. If the overload is open, allow time (several minutes) for overload to reset. There are currently 6 different inducer assemblies to service all single stage, 2stage, and Variable Speed furnaces. Each motor has a different horsepower and/or RPM range required for the various size furnaces. The motor supplied in the kit is a 2-speed inducer motor. Single stage operation is achieved through the use of an adapter harness included with the kit. Refer to tables 1 or 2 below for the correct furnace and kit combination. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.