Assessments - 2, GPA: 4
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a. If the return air filter is on the left or right side of the furnace it is a side return b. If the air filter is on the bottom of the furnace then you have a bottom return. c. If the air filters are on the bottom and the side of the furnace then you have a bottom and side return. You must replace both air filters. Table 1 will indicate 2 filters by using brackets with the number two (2). d. If the air filters are on both sides of the furnace then you have a two sided return. You must replace both air filters. Table 1 will indicate 2 filters by using brackets with the number two (2). 3. After you determine the cabinet size and what return configuration you have, look up the recommended filter size from Table 1. Removing Filters Most downflow furnaces have their filters located on the top of the furnace in an external filter rack. To check filters you should: 1. Follow the instructions to turn off the appliance before servicing. 2. Filters are installed in the return air plenum above the blower assembly. An “A” frame assembly supports the filters. Lift the filter slightly and remove for service. 3. Follow the instructions “HOW TO CLEAN YOUR FURNACE’S FILTER”. 4. Reverse the procedure to reinstall filters. 5. Follow the operating instructions to place appliance in operation. FIGURE 7: Filter Rack Assembly and Attachment FILTERRACK(factorysuppliedwithsomefurnaces) RACKANDFILTERSSECUREDINSIDEBLOWERSECTIONFORSHIPMENTDUCTWORKFILTERSBRANCHDUCTSFHCROSSSECTIONA-A(withPlenumandfilters) FILTERRACKNOTE:FILTERACCESSTHROUGHDUCTWORKMUSTBEPROVIDEDFORREMOVALANDCLEANINGCASINGSIZEDIMENSIONFH14-1/2” 17-1/2” 21” 24-1/2” 13-1/4” 12-1/2” 11-1/2” 9-3/4” Externally Mounted Air Filters Some installations may have the air filter in a rack attached to the casing of the furnace or placed in the return air duct. You can gain access to the filter by pulling on the door or unscrewing the retaining screw, then slide the filter(s) out of its channel. Replace throw away filter(s) with the same size new filter(s). Throw away filter(s) may be replaced with cleanable filter(s) at this time. Cleanable filter(s) may be cleaned as described in the manufacturer instructions or as described below and then re-installed. How to Clean your Filter High-velocity filters may be cleaned with a vacuum cleaner or washed with a garden hose. Be sure to shake off excess water and allow filter to completely dry before re-installing the filter. To replace the filter after cleaning you must do the following: 1. Slide filter into place. 2. Snap the door on or place the door in position and tighten the retaining screws, if provided. 3. Make sure the door is secure to the end of the filter rack. 4. For filter grilles, place the filter into the grilles, close the grille cover and tighten the retaining screw. Every time the filters are changed the following items should be visually inspected: • Check combustion air and vent pipe for blockage or leakage. • Check all components to be sure they are in good condition and that there are no obvious signs of deterioration. • Check the drain lines to make sure there are no cracks or leaks. • Check for dirt or lint on any surfaces or on components. Do not try to clean any of the surfaces or components. Cleaning of the furnace and its components must be done by a qualified service professional. Unitary Products Group 127237-UUM-A-0605 If, during the inspection of your furnace, you find any of the following conditions: • Excessive amounts of dust and lint on components. • Damaged or deteriorated components or surfaces. • Leaks or blockage in the vent pipe passages. • Water on any surface inside or outside of the furnace. Do not operate the furnace, call a certified dealer / servicing contractor to check and / or clean your furnace, or for more information if you have questions about the operation of your furnace. If all components appear to be in good operating condition, replace the front panels. Turn ON the gas and electrical power supplies to the furnace, and set thermostat to the desired temperature. Motor Lubrication The motors in these furnaces are permanently lubricated, and do not require periodic oiling. TABLE 1: Filter Sizes Input / Output BTU/H (kW) CFM (m3/min) Cabinet Size Top Return Filter in(cm) 40/37 (11.72/10.84) 1200 (34) A (2) 14 x 20 (36 x 51) 60/55 (17.57/16.10) 1200 (34) B (2) 14 x 20 (36 x 51) 80/75 (23.42/21.96) 1200 (34) B (2) 14 x 20 (36 x 51) 80/75 (23.42/21.96) 1600 (45) C (2) 14 x 20 (36 x 51) 100/95 (29.28/27.82) 1600 (45) C (2) 14 x 20 (36 x 51) 100/95 (29.28/27.82) 2000 (57) C (2) 14 x 20 (36 x 51) 120/112 (35.14/32.80) 2000 (57) D (2) 14 x 20 (36 x 51) SECTION II: SERVICE AND MAINTENANCE MANUAL SAFETY SECTION The following safety rules must be followed when servicing the furnace. ELECTRIC SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, s...
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