Lennox SL280UHV Installation Instructions Manual Download | Manualshive

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Page 34

TYPICAL SL280UHV FIELD WIRING DIAGRAM

FIGURE 33

FIELD INSTALLED CLASS II 24V

FIELD INSTALLED LINE VOLTAGE

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Summary of Contents for SL280UHV

Page 1: ...ipment NOTICE A thermostat is not included and must be ordered separately The Lennox icomfort Touch thermostat must be used in communicating applications In non communicating applications the Lennox C...

Page 2: ...n Air Opening FRONT VIEW A B 9 16 14 C 3 4 33 838 16 406 14 3 4 375 3 OPTIONAL EXTERNAL SIDE RETURN AIR FILTER KIT Either Side 5 8 16 FLUE OUTLET Top SUPPLY AIR OPENING TOP VIEW D 3 OPTIONAL EXTERNAL...

Page 3: ...INET COMBUSTION AIR INDUCER BLOWER ASSEMBLY BURNER BOX INNER BLOWER ACCESS PANEL ACCESS PANEL SIGHT GLASS COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CONTROL BOX Includes two stage integrated con...

Page 4: ...ency or the gas supplier CAUTION As with any mechanical equipment personal injury can result from contact with sharp sheet metal edges Be careful when you handle this equipment Certifications SL280UHV...

Page 5: ...allation in mobile homes recreational vehicles or outdoors Never use an open flame to test for gas leaks Check all connections using a commercially available soap solution made specifically for leak d...

Page 6: ...tion and ventilation use the guidelines and procedures in this section to install SL280UHV furnaces to ensure effi cient and safe operation You must consider combustion air needs and requirements for...

Page 7: ...inches 64516 mm2 AIR FLOW FIGURE 2 Air from Inside If the confined space that houses the furnace adjoins a space categorized as unconfined air can be brought in by providing two permanent openings be...

Page 8: ...are inch 645 mm2 per 4 000 Btu 1 17 kW per hour of the total input rating of all equip ment in the enclosure CHIMNEY OR GAS VENT WATER HEATER OUTLET AIR VENTILATION LOUVERS Each end of attic INLET AIR...

Page 9: ...ved before the furnace is placed into opera tion After the bolt and washer have been removed the rig id leg will not touch the blower housing FIGURE 6 RIGID LEG remove shipping bolt and washer SL280UH...

Page 10: ...er AIR FLOW Single Side Return Air with transition and filter Optional Return Air Base Upflow Applications Only For use with A B C and D cabinets FIGURE 9 NOTE Optional Side Return Air Filter Kits are...

Page 11: ...o combustible materials as indicated on the unit nameplate Minimum clearances for closet or al cove installations are shown in figure 11 This furnace may be installed in either an attic or a crawl spa...

Page 12: ...of Heating Refrigerating and Air Conditioning Engineers to size and install the supply and return air duct system This will result in a quiet and low static system that has uniform air distribution NO...

Page 13: ...ly to the orifice plate Lift and rotate the assem bly 90 degrees clockwise or counter clockwise to either the 3 o clock position or to 9 o clock position and re se cure with four screws Gasket should...

Page 14: ...switch assembly 1 screw and cut wire tie to free pressure switch wires Re install pressure switch on the other side of orifice plate and re connect pressure switch hose Re secure pressure switch wire...

Page 15: ...tener to firmly secure the vent pipe to the round collar of the flue transition If self drilling screws are used to attach the vent pipe it is recommended that three be used Drive one self drilling s...

Page 16: ...ed standards lined or relined with suitable materials or replaced with a gas vent or chimney suitable for venting SL280UHV series units The chimney passageway must be checked periodically to ensure th...

Page 17: ...shall be assembled according to the manufacturer s instructions Joints between sections of single wall connector piping shall be fastened by screws or other approved means 13 When the vent connector...

Page 18: ...22 339 5 22 65 30 130 39 219 49 330 10 29 59 40 121 51 206 64 315 15 35 53 48 112 61 195 76 301 20 0 0 97 0 202 0 349 0 540 2 10 75 14 149 18 250 20 377 5 21 71 29 143 38 242 47 367 10 28 64 38 133 50...

Page 19: ...225 115 337 5 51 63 75 128 102 216 144 326 10 NR NR 95 116 128 201 182 308 15 NR NR NR NR 158 186 220 290 20 0 35 96 54 200 78 346 114 537 2 37 74 56 148 78 248 113 375 5 50 68 73 140 100 239 141 363...

Page 20: ...1 21 50 33 89 47 142 64 220 2 22 53 35 96 49 153 66 235 3 24 55 36 102 51 163 68 248 20 1 21 54 33 99 46 157 62 246 2 22 57 34 105 48 167 64 259 3 23 60 35 110 50 176 66 271 30 1 20 62 31 113 45 181...

Page 21: ...278 2 51 62 81 115 117 185 177 290 3 54 64 85 119 122 193 185 300 NOTE Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system For all other...

Page 22: ...ch could cause an unsafe condition 3 Close all building doors and windows and all doors be tween the space in which the appliances remaining connected to the common venting system are located and othe...

Page 23: ...nd joint type IMPORTANT Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petro leum gases NOTE If emergency shutoff is necessary shut off the main manual g...

Page 24: ...ions 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...

Page 25: ...s shown in table 10 TABLE 10 SL280UH Model Maximum Over Current Protection Amps 070V36A 09036B 15 090V48B 090V60C 110V60C 135V60D 20 2 Holes are on both sides of the furnace cabinet to facili tate wir...

Page 26: ...on the C terminal of the icomfort communication terminal strip RSBus Using an addition al wire come off C terminal and wire nut all the extra wires together Termination on the outdoor control must ma...

Page 27: ...mfort Touch Thermostat icomfort Enabled SL280UHV Indoor Furnace icomfort Enabled Outdoor Air Conditioner or Heat Pump icomfort ENABLED SL280UHV FURNACE icomfort ENABLED OUTDOOR AIR CONDITIONING OR HEA...

Page 28: ...HVAC EQUIP DEHUMIDIFIER CONTROL HVAC EQUIPMENT DH STANDARD 1 OR 2 STAGE AC OR HP UNIT 24V IN JUMPER icomfort ENABLED SL280UHV FURNACE icomfort ENABLED SL280UHV FURNACE icomfort Touch THERMOSTAT CONVEN...

Page 29: ...inutes ON DO NOT CUT ANY ON BOARD LINKS S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT 1 Heat 2 Cool NOTE Use DIP switch 2 to set second stage heat ON delay OFF 7 minutes ON 12 minutes ON CUT ON BOARD LINK...

Page 30: ...LINK W915 2 STAGE COMPR S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT 2 Heat 2 Cool with t stat with humidity control OFF CUT ON BOARD LINK W915 2 STAGE COMPR CUT ON BOARD LINK W914 DEHUM OR HARMONY S1 T...

Page 31: ...T ON BOARD LINK W951 HEAT PUMP L7724U T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor Dual Fuel Two Stage Heat Pump ComfortSense 7000 L7724U thermostat w dual fuel capa...

Page 32: ...BOARD LINK W914 DEHUM OR HARMONY L7724U T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor Dual Fuel Two Stage Heat Pump ComfortSense 7000 L7724U thermostat w dual fuel cap...

Page 33: ...Page 33 SL280UHV Schematic Wiring Diagram FIGURE 32...

Page 34: ...Page 34 TYPICAL SL280UHV FIELD WIRING DIAGRAM FIGURE 33 FIELD INSTALLED CLASS II 24V FIELD INSTALLED LINE VOLTAGE...

Page 35: ...HEAT DEMAND FROM 1ST STAGE T STAT R CLASS 2 VOLTAGE TO THERMOSTAT G MANUAL FAN FROM T STAT C THERMOSTAT SIGNAL GROUND CONNECTED TO TRANSFORMER GRD TR CHASIS GROUND GRD Y1 THERMOSTAT 1ST STAGE COOL SI...

Page 36: ...erates after the heating demand has been satisfied can be adjusted by moving switches 3 and 4 on the integrated control The unit is shipped from the factory with a blower off delay of 90 seconds The b...

Page 37: ...amps down to stop OFF OFF 100 CFM 100 CFM 45 SEC COMPRESSOR DEMAND Ramping Option D Motor runs at 100 until demand is satisfied Once demand is met motor ramps down to stop OFF OFF 100 CFM COMPRESSOR D...

Page 38: ...board link W915 is a clippable connection between ter minals Y1 and Y2 on the integrated control W915 must be cut if two stage cooling will be used If the Y1 to Y2 link is not cut the outdoor unit wi...

Page 39: ...nd Stage Heating Speed cfm 24 1050 1165 18 1000 1110 12 940 1040 6 895 975 Factory Default 820 935 6 775 855 12 735 805 18 685 750 COOLING 1 Cooling Speed DIP Switch Settings First Stage Cooling Speed...

Page 40: ...cond Stage Heating Speed cfm 24 1305 1425 18 1250 1350 12 1195 1290 6 1135 1230 Factory Default 1070 1165 6 995 1100 12 935 1030 18 870 960 COOLING 1 Cooling Speed DIP Switch Settings First Stage Cool...

Page 41: ...ond Stage Heating Speed cfm 24 1280 1410 18 1220 1340 12 1155 1270 6 1095 1205 Factory Default 1035 1135 6 970 1070 12 910 1000 18 845 930 COOLING 1 Cooling Speed DIP Switch Settings First Stage Cooli...

Page 42: ...igh 2 High 660 905 1030 1175 985 1290 1495 1675 Factory Default 600 760 930 1045 905 1125 1345 1525 535 700 850 970 815 1040 1225 1385 1 Cooling and heating speeds are based on a combination of DIP sw...

Page 43: ...s First Stage Heating Speed cfm Second Stage Heating Speed cfm 24 1360 1500 18 1295 1425 12 1230 1355 6 1165 1280 Factory Default 1100 1210 6 1030 1135 12 965 1065 18 900 990 COOLING 1 Cooling Speed D...

Page 44: ...2 High 1050 1190 1380 1615 1515 1715 1930 2240 Factory Default 970 1090 1245 1485 1380 1560 1755 2070 880 985 1095 1285 1215 1400 1580 1830 1 Cooling and heating speeds are based on a combination of D...

Page 45: ...First Stage Heating Speed cfm Second Stage Heating Speed cfm 24 1640 1805 18 1560 1715 12 1480 1630 6 1400 1545 Factory Default 1325 1455 6 1245 1370 12 1165 1280 18 1085 1195 COOLING 1 Cooling Speed...

Page 46: ...2 High 1085 1160 1270 1490 1595 1660 1840 2115 Factory Default 1010 1040 1160 1375 1470 1535 1655 1940 900 955 1025 1205 1315 1365 1510 1735 1 Cooling and heating speeds are based on a combination of...

Page 47: ...First Stage Heating Speed cfm Second Stage Heating Speed cfm 24 1850 2035 18 1760 1935 12 1670 1835 6 1580 1740 Factory Default 1490 1640 6 1400 1540 12 1310 1445 18 1225 1345 COOLING 1 Cooling Speed...

Page 48: ...h 2 High 1035 1105 1285 1610 1530 1610 1825 2240 Factory Default 955 1005 1145 1430 1365 1450 1650 2040 860 935 1050 1295 1225 1310 1515 1850 1 Cooling and heating speeds are based on a combination of...

Page 49: ...SION MODE operates independent of a Y1 thermostat demand Normal Operation 1 On On On Acceptable 24 VAC High 100 Dehumidification mode begins when humidity is greater than set point Dehumidification ca...

Page 50: ...ng the room space to maintain a cooler room thermostat setpoint ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING BASIC MODE only active on a Y1 thermostat demand Normal Opera tion 1 On On On O...

Page 51: ...mostat calls for heat the burners will automatically light The ignitor does not get hot when there is no call for heat on units with an automatic ignition system WARNING If you do not follow these ins...

Page 52: ...tap plug TABLE 20 GAS METER CLOCKING CHART SL280 Unit Seconds for One Revolution Natural LP 1 cu ft Dial 2 cu ft Dial 1 cu ft Dial 2 cu ft DIAL 045 80 160 200 400 70 55 110 136 272 90 41 82 102 204 1...

Page 53: ...5 13 0 LP propane3 039 037 4 9 10 0 4 9 10 0 4 9 10 0 11 0 13 0 1 This is the only permissible derate for these units 2 Natural gas high altitude orifice kit required 3 A natural to L P propane gas ch...

Page 54: ...inte grated control runs a self diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts The combustion air inducer i...

Page 55: ...l also initi ates a second stage on delay factory set at 7 minutes adjustable to 12 minutes 5 If the heating demand continues beyond the second stage on delay the integrated control energizes the comb...

Page 56: ...nnections for tight ness and to make sure there is no blockage 2 Check unit for proper draft Electrical 1 Check all wiring for loose connections 2 Check for the correct voltage at the furnace furnace...

Page 57: ...st not exceed 275 F 12 To clean burners run a vacuum cleaner with a soft brush attachment over the face of burners Visually inspect in side the burners and crossovers for any blockage caused by foreig...

Page 58: ...er operation 23 Check all piping connections factory and field for gas leaks Use a leak detecting solution or other preferred means CAUTION Some soaps used for leak detection are corrosive to certain...

Page 59: ...furnace until the items can be repaired or replaced Instruct the homeowners to pay attention to their furnace Situations can arise between annual furnace in spections that may result in unsafe operati...

Page 60: ...s Every five seconds a new menu item will be displayed Release the button when the desired mode is displayed When a solid P is displayed the furnace capacity size is programmed When the solid E is dis...

Page 61: ...ck and correct voltage Check for additional power rob bing equipment connected to system May require installation of larger VA transformer to be installed in furnace air handler Clears after fault rec...

Page 62: ...mmunicate with blow er motor Indoor blower communication failure including pow er outage Lost communication with indoor blower motor Possible causes motor not powered loose wiring Problem may be on co...

Page 63: ...ation and restriction Re sumes normal operation after fault is cleared E 228 Combustion air inducer calibration failure Unable to perform pressure switch calibration Check vent system and pressure swi...

Page 64: ...not within specifications 1 hour soft lock out Clears when flame has been proven stable E 291 Heat air flow restricted below the minimum Check for dirty filter and air flow restriction Check blower pe...

Page 65: ...etween R O on integrated control with non communi cating outdoor unit Dual fuel module required for heat pump application Configuration link R to O needs to be restored Re place link or hard wire Appl...

Page 66: ...current is not passing through Run current transformer Clears the error after cur rent is sensed in RUN sensor or 1 normal compres sor run cycle or after power reset E 408 LSOM Compressor contactor is...

Page 67: ...egrated control will store code in memory and will automatically exit Program Unit Capacity Size Mode and reset If second period expires or push button is held less than five seconds control will auto...

Page 68: ...OFF NO INDUCER OFF AFTER POST PURGE HARD LOCKOUT ERROR CODE FLASHES YES YES YES 1 2 1 LOW PRESSURE SWITCH OPENS 1 2 HARD LOCKOUT REQUIRES THERMOSTAT RESET OR CYCLING OF POWER TO RESET THE LOCKOUT 3 IN...

Page 69: ...ZED ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT YES CALL FOR HEAT SATISFIED INDUCER SWITCHED TO HIGH SPEED SINGLE STAGE THERMOSTAT 2 STAGE THERMOSTAT NO INDUCER SWITCHED TO LOW SPEED 5 MINUTE DELAY ERROR...

Page 70: ...L 2ND STAGE CALL FOR HEAT SATISFIED NO YES DE ENERGIZE 2ND STAGE GAS VALVE INDUCER SPEED SWITCHED TO LOW SPEED 1 2 3 1ST STAGE HEAT 1ST STAGE CALL FOR HEAT SATISFIED NO YES GAS VALVE DE ENERGIZED INDU...

Page 71: ...SPEED RAMPING PROFILES THE SPECIFIC PROFILE IS SELECTED USING THE 1 1 2 2 1 1 1 2 2 DE ENERGIZE 1ST STAGE COOLING CONTACTOR COMPRESSOR FAN 2ND STAGE COOLING REQUEST STILL ACTIVE COOLING REQUEST STILL...

Page 72: ...REQUEST FOR HEAT RECEIVED REQUEST FOR COOLING RECEIVED GO TO CALL FOR 1ST STAGE HEAT YES GO TO CALL FOR COOLING 1 1 1 4 YES NO CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED MAINTAIN INDOOR BLOWE...

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