Évaluations - 4, GPA: 4 ( )

Fabricant : Sears Taille : 3.24 mb Nom Fichier : Langue d'enseignement:

Figure 24, Figure 25, Figure 26, Figure 27 and Figure 28, but the next vent termination must be at least 36" away from first 2 terminations. It is important that vent terminations be made as shown to avoid recirculation of flue gases. Gradeor Snow Level I c°ncentric Roof Terminationvent and c°mbusti°n-Air Dimension "A" is touchin9 or 2" maximum separation. iiiil Rooftop Inlet Vent and Exhaust- 12"Min. Gradeori Air Termination Snow Level 18"Min.forColdClimates _ \ _( SustainedBelow0° F) 8"Min. 20'Max. Combustion Air Dimension "A" is touching or 2" maximum separation. / Concentric Vent and Combustion 12" Min. Exhaust Air Sidewall Termination Level 25-22-43 Recommended Alternate Installation for Sustained Cold Weather (-O ° F & below) OVERHANG EXHAUST 12"MIN. Exhaust Vent 25-22-02d Dimension "A" is touching or 2" maximum separation. IN ET Sidewall Inlet Vent and Exhaust- Air Termination Level OR Snow Level SIDE VIEW FRONT VIEW 18"Min.for ColdClimates (SustainedBelow0o F 12" Min. Grade or Snow Level FF_iDiDimension "A" is touchin9 or 2" maximum separation. Same Joist 25-23-73 Space 440 01 1020 04 5. Gas Supply and Piping CARBON MONOXIDE POISONING, FIRE AND EXPLOSION HAZARD. Failure to follow these instructions could result in death, personal injury and/or property damage. Models designated for Natural Gas are to be used with Natural Gas ONLY, unless properly converted to use with LP gas. NOTE: The rating plate is stamped with the model number, gas type and gas input rating. In addition, models manufactured for sale in Canada have orifice size information stamped on the rating plate. Alternate BTUH Input Ratings (USA Only) The input rating of these furnaces can be changed from the standard input rating to the alternate input rating shown in Table 5, by changing the main burner orifices. NOTE: The input rating ot 80,000 BTUH models cannot be changed from the standard input. Changing of burner orifices MUST be done by a qualified service technician. See section on changing orifices or following page. IAIternate Input Ratings, USA ONLY. BTUH BTUH Natural Standard Alternate Gas Rating Rating Orifice 50,000 40,000 #44 75,000 60,000 #44 100,000 80,000 #44 125,000 100,000 #44 Supply Pressure FIRE HAZARD LP Gas Orifice #55 #55 #55 #55 Failure to properly set input pressure could result in death, personal injury and/or property damage. Do NOT set input rating above that shown on rating plate. 1. Supplypressurecanbecheckedusingthel/8 " NPTporton the supply side of the gas valve. 2. Gas input to burners MUST NOT exceed the rated input shown on rating plate. 3. Do NOT allow minimum gas supply pressure to vary downward. Doing so will decrease input to furnace. Refer to Table 6 for normal gas supply and manifold pressures. Gas Supply Pressure Gas supply pressure should be within minimum and maximum values listed on rating plate. Pressures are usually set by gas suppliers. Manifold Gas Pressure Adjustment NOTE: Make adjustment to manifold pressure with burners operating. ELECTRICAL SHOCK HAZARD. Failure to do so could result in death, personal injury and/or property damage. Turn OFF power to furnace before changing speed taps. 1. Remove the burner compartment door. 2. With gas OFF, connect manometer to tapped opening on gas valve. Use manometer with a 0 to 15" water column range. 3. Turn gas ON. Operate the furnace by using a jumper wire on the R to W thermostat connections on the fan board. 4. Remove manifold pressure adjustment screw cover on furnace gas control valve. Turn adjusting screw counterclockwise to decrease manifold pressure and clockwise to increase pressure. NOTE: Adjustment screw cover MUST be replaced on gas control valve before reading manifold pressure and operating furnace. 5. Set manifold pressure to value shown in Table 6, Table 7, Table 8 or Table 9. 6. When the manifold pressure is properly set, replace the adjustment 7. Remove board. pressure 8. Check 9. Replace screw cover on the gas control valve. jumper wire from thermostat connection on fan Remove manometer connection from manifold tap, and replace plug in manifold. for leaks at plug. the burner compartment door. 44001 102004 [_ MANIFOLDPRESSUREAND ORIFICESIZEFORHIGHALTITUDEAPPLICATIONS iii iiiiiii_ ii_!!!!!!! i NATURAL GAS MANIFOLD PRESSURE (" w.c.) ..............................................................BTUH MODELS FOR THE 50,000, 75,000, 100,000 and 125,000 MEAN ELEVATION FEET ABOVE SEA LEVEL HEATING 0 to 2001 to 3001 to 4001 to 5001 to 6001 to 7001 to VALUE 2000 3000 4000 5000 6000 7000 8000 at ALTITUDE BTU/CU. FT, Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure 700 41 3.7 725 41 3.7 41 3.4 750 41 3.5 42 3.6 775 41 3.6 42 3.6 42 3.3 800 41 3.6 42 3,7 42 3,4 42 3.1 825 41 3.7 41 3.4 42 3.5 42 3.2 42 2.9 850 41 3.5 42 3.6 42 3,3 42 3,0 42 2.8 875 41 3.6 42 3.6 42 3.4 42 3.1 42 2.8 ...

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