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Производитель: Sears Размер: 2.69 mb Название файла: Язык инструкции:

Galvanized Steel NOTE: If filters are only suitable for heating vise homeowner that filter size may need to conditioning is added. application, be increased ad- if air Addition Of Air Conditioning See Section 10. FIRE OR EXPLOSION HAZARD. Failure to turn OFF gas at shut off before connecting manometer could result in death, personal injury and/or property damage. Turn OFF gas at shut off before connecting manometer. 1. With gas OFF, connect manometer to manifold pressure tap on outlet of gas control valve. See Figure 34. Use a manometer with a 0" to 12" water column range. Typical Gas Control Valve Honeywell RegulatorAdjustment UnderCa Outlet HONEYWELL Pressure ©o ©o Tap 1/8NPT / OUTLET Inlet Pressure Tap1/8NPT 25-24-98a Manifold Gas Pressure Adjustment 2. Turn gas ON. Operate the furnace by using a jumper wire on the R to W thermostat connection on the control. NOTE: Make adjustment to manifold pressure with burners oper-3. Remove manifold pressure adjustment screw cover on furatin . nace as control valve. Turn ad_screw counterclock441 01 261302 wiseto decreasemanifoldpressureandclockwiseto increase pressure. NOTE: Adjustment screw cover MUST be replaced on gas control valve before reading manifold pressure and operating furnace. 4, Set manifold pressure to value shown in Table 6 or Table 7. 5. When the manifold pressure is properly set, replace the adjustment screw cover on the gas control valve. board. Remove manometer connection from manifold pres 6. Remove jumper wire from thermostat connection on fan sure tap, and replace plug in gas valve. 7. Check for leaks at plug. Natural Gas Input Rating Check The gas meter can be used to measure input to furnace. Check with gas supplier for actual BTU content. 1. Turn OFF gas supply to all appliances other than furnace and start furnace. Use jumper wire on R to W. 2. Time how many seconds it takes the smallest dial on the gas meter to make one complete revolution. Note: If meter uses a 2 cubic foot dial, divide results (seconds) by two. Refer to Example. The Example is based on a natural gas BTU content of 1,000 BTU's per cubic foot. Example Natural Gas Time Per Cubic BTU Content No. of Seconds Foot in BTU Per Per Hour Hour per cubic foot Seconds 1,000 3,600 48 75,000 1,000 x 3,600 + 48 = 75,000 BTUH 3. Remove jumper wire from R to W. 4. Relight all appliances and ensure all pilots are operating. Orifice Sizing NOTE: Factory sized orifices for natural and LP gas are listed in the furnace Technical Support Manual. Ensure furnace is equipped with the correct main burner orifices. Refer to Table 6 or Table 7 for correct orifice size and manifold pressure for a given heating value and specific gravity for natural and propane gas. Operation Above 2000' Altitude FIRE, EXPLOSION, CARBON MONOXIDE POISONING HAZARD. Failure to follow these instructions exactly could result in death, personal injury and/or property dam age. This high-altitude gas-conversion shall be done by a qualified service agency in accordance with the Manufacturer's instructions and all applicable codes and requirements, or in the absence of local codes, the applicable national codes. These furnace may be used at full input rating when installed at al titudes up to 2000'. When installed above 2000', the input must be decreased 2% (natural) or 4% (LP) for each 1000' above sea level in the USA. In Canada, the input rating must be derated 5% (natural) or 10% (LP) for each 1000' above sea level. This may be accomplished by a simple adjustment of manifold pressure or an orifice change, or a combination of a pressure adjustment and an orifice change. The changes required depend on the installation altitude and the heating value of the fuel. Table 6 & Table 7 show the proper furnace manifold pressure and gas orifice size to achieve proper performance based on elevation above sea level for both natural gas and propane gas. To use the natural gas table, first consult your local gas utility for the heating value of the gas supply. Select the heating value in the first column and follow across the table until the appropriate elevation for the installation is reached. The value in the box at the intersection of the altitude and heating value provides not only the manifold pressure but also the orifice size. In the natural gas tables the factoy-shipped orifice size is in bold (42). Other sizes must be obtained from service parts. High Altitude Input Rate = Nameplate Sea Level Input Rate x (Multiplier) [USA] High Altitude Multiplier Elevation Natural Gas LP Gas 2001'-3000' 0.95 0.90 3001'-4000' 0.93 0.86 4001'-5000' 0.91 0.82 5001'-6000' 0.89 0.78 6001'-7000' 0.87 0.74 7001'-8000' 0.85 0.70 * Based on mid-range of elevation. _] 441 01 261302 MANIFOLDPRESSUREAND ORIFICESIZEFORHIGHALTITUDEAPPLICATIONS NATURAL GAS MANIFOLD PRESSURE (" w.c.) .............................................................. 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...

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