EL280UH Two-Stage Gas Furnace Installation Manual - Lennox

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MANUAL MAIN SHUT−OFF VALVE (With 1/8 in. NPT Plugged Tap Shown) Left Side Piping (Standard) AUTOMATIC GAS VALVE AUTOMATIC GAS VALVE MANUAL MAIN SHUT−OFF VALVE (With 1/8 in. NPT Plugged Tap Shown) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG DRIP LEG FIELD PROVIDED AND INSTALLED NOTE − BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET FIGURE 26 Horizontal Applications Possible <strong>Gas</strong> Piping Configurations Right Side Piping (Alternate) MANUAL MAIN SHUT−OFF VALVE GROUND JOINT UNION MANUAL MAIN SHUT−OFF VALVE GROUND JOINT UNION DRIP LEG Horizontal Application Left−Side Air Discharge DRIP LEG MANUAL MAIN SHUT−OFF VALVE Horizontal Application Right−Side Air Discharge FIELD PROVIDED AND INSTALLED NOTE − BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET GROUND JOINT UNION DRIP LEG FIGURE 27 Page 24
Leak Check After gas piping is completed, carefully check all piping connections (factory− and field−installed) for gas leaks. Use a leak detecting solution or other preferred means. NOTE − If emergency shutoff is necessary, shut off the main manual gas valve and disconnect the main power to the furnace. The installer should properly label these devices. CAUTION Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly after leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks. The unit is equipped with a field make−up box on the left hand side of the cabinet. The make−up box may be moved to the right side of the furnace to facilitate installation. If the make−up box is moved to the right side, clip the wire ties that bundle the wires together. The excess wire must be pulled into the blower compartment. Secure the excess wire to the existing harness to protect it from damage. BOX INTERIOR MAKE−UP BOX INSTALLATION Right Side The furnace must be isolated by closing its individual manual shut-off valve and disconnecting from from the gas supply system the during any pressure testing of the gas supply system at pressures greater than 1/2 psig (3.48 kPa, 14 inches w.c.). IMPORTANT When testing pressure of gas lines, gas valve must be disconnected and isolated. See figure 28. <strong>Gas</strong> valves can be damaged if subjected to pressures greater than 1/2 psig (3.48 kPa, 14 inches w.c.). FIGURE 29 INTERIOR MAKE−UP BOX INSTALLATION Left side BOX MANUAL MAIN SHUT−OFF VALVE WILL NOT HOLD NORMAL TEST PRESSURE 1/8 NPT PLUG ISOLATE GAS VALVE CAP FIGURE 28 FURNACE Electrical ELECTROSTATIC DISCHARGE (ESD) Precautions and Procedures CAUTION Electrostatic discharge can affect electronic components. Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control. FIGURE 30 Refer to figure 31 for schematic wiring diagram and troubleshooting and table 10 and figure 32 for field wiring. The power supply wiring must meet Class I restrictions. Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate. NOTE − Unit nameplate states maximum current draw. Maximum over−current protection allowed is 15 AMP. Holes are on both sides of the furnace cabinet to facilitate wiring. Install a separate (properly sized) disconnect switch near the furnace so that power can be turned off for servicing. Page 25
Page 1 and 2: 2012 Lennox Industries Inc. Dallas,
Page 3 and 4: Parts Arrangement Make Up Box Heat
Page 5 and 6: Installed in Combination with a Coo
Page 7 and 8: Unconfined Space An unconfined spac
Page 9 and 10: Setting Equipment WARNING Do not in
Page 11 and 12: Removing the Bottom Panel Remove th
Page 13 and 14: Venting A 4−inch diameter flue tr
Page 15 and 16: The EL280UH series units are classi
Page 17 and 18: Common Venting Using Tile−Lined I
Page 19 and 20: Height H (feet) 6 8 10 15 20 30 TAB
Page 21 and 22: Height H (feet) Lateral L (feet) TA
Page 23: Gas Piping Gas supply piping should
Page 27 and 28: Thermostat TABLE 10 Field Wiring Ap
Page 29 and 30: EL280UH SCHEMATIC WIRING DIAGRAM G
Page 31 and 32: Integrated Control EL280UH units ar
Page 33 and 34: 9 − Is the unit ignition system i
Page 35 and 36: Other Unit Adjustments Primary and
Page 37 and 38: BLOWER DATA EL280UH070P24A PERFORMA
Page 39 and 40: Service WARNING ELECTRICAL SHOCK, F
Page 41 and 42: 9 − Remove screws from both sides
Page 43 and 44: Integrated Control Diagnostic Codes
Page 45 and 46: Troubleshooting: Heating Sequence o
Page 47 and 48: Troubleshooting: Heating Sequence o
Page 49 and 50: Troubleshooting: Continuous Fan Seq
Page 51: UNIT OPERATION (typical) Combustion

EL280UH Two-Stage Gas Furnace Installation Manual - Lennox

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