Lennox SIGNATURE SLP99UH070XV36B, Unit Information

Page 1: ...to 132 000 Btuh 19 3 to 38 6 kW and cooling ap plications from 2 to 5 tons 7 0 kW to 17 5 kW Refer to Engineering Handbook for proper sizing Units are factory equipped for use with natural gas Kits are available for conversion to LPG operation SLP99UHV models include a SureLight variable capacity integrated control that can be used with a Lennox communicating thermostat as part of a communicating ...

Page 2: ...for non weatherized furnaces 2 2 in Rubber Flue Coupling is furnished for exhaust pipe connection to unit SPECIFICATIONS Gas Heating Performance Model No SLP99UH090XV60C SLP99UH110XV60C SLP99UH135XV60D 1 AFUE 99 98 1 98 4 Maximum Input Btuh 88 000 110 000 132 000 Output Btuh 87 000 106 000 128 000 Temperature rise range F 50 80 50 80 55 85 Gas Manifold Pressure in w g Nat Gas LPG Propane 3 5 10 0 ...

Page 3: ...3 66K63 Size of filter in 16 x 25 x 1 16 x 25 x 1 16 x 25 x 1 TERMINATION KITS Direct Vent Applications Only See Installation Instructions for specific venting information Direct Vent Concentric US 2 in 71M80 69M29 3 in 60L46 60L46 Canada 2 in 44W92 44W92 3 in 44W93 44W93 Flush Mount US 2 2 1 2 or 3 in 51W11 51W11 51W11 Canada 2 2 1 2 or 3 in 51W12 51W12 51W12 Wall Close Couple US 2 in 22G44 3 in ...

Page 4: ... 970 860 1060 1215 1365 Default Cool CFM 555 665 770 855 810 960 1130 1265 Decrease 10 Cool CFM 500 600 680 790 705 840 1005 1140 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermostat 35 70 100 in...

Page 5: ... 840 1050 1205 1355 Default Cool CFM 540 640 725 820 750 945 1130 1230 Decrease 10 Cool CFM 500 580 665 720 685 805 990 1110 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermostat 35 70 100 input t...

Page 6: ...l CFM 595 715 815 950 855 1045 1205 1350 Default Cool CFM 520 655 755 840 790 945 1090 1255 Decrease 10 Cool CFM 490 595 670 745 720 845 985 1130 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermos...

Page 7: ... 830 950 875 1040 1210 1360 Default Cool CFM 565 670 760 860 800 945 1100 1240 Decrease 10 Cool CFM 520 610 685 785 720 840 970 1115 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermostat 35 70 100...

Page 8: ...05 795 920 840 1015 1165 1300 Default Cool CFM 560 640 715 810 770 910 1050 1190 Decrease 10 Cool CFM 525 605 665 725 695 795 945 1110 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermostat 35 70 1...

Page 9: ... Cool CFM 605 715 810 930 850 995 1165 1305 Default Cool CFM 570 660 735 820 775 905 1050 1205 Decrease 10 Cool CFM 530 600 670 725 710 800 945 1070 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage ther...

Page 10: ...5 1155 1315 1165 1375 1580 1770 Default Cool CFM 780 915 1045 1190 1075 1265 1440 1645 Decrease 10 Cool CFM 690 835 955 1070 935 1145 1320 1465 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermosta...

Page 11: ...005 1135 1290 1140 1340 1525 1725 Default Cool CFM 755 880 1025 1150 1040 1235 1395 1565 Decrease 10 Cool CFM 680 815 925 1065 910 1120 1275 1400 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermos...

Page 12: ...0 Cool CFM 840 955 1120 1280 1160 1360 1530 1740 Default Cool CFM 775 910 1010 1170 1060 1240 1400 1590 Decrease 10 Cool CFM 695 815 930 1045 925 1130 1295 1440 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Singl...

Page 13: ...445 1620 1590 1815 2010 2195 Default Cool CFM 975 1120 1295 1460 1460 1645 1845 2010 Decrease 10 Cool CFM 865 1010 1120 1290 1320 1500 1645 1860 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage thermost...

Page 14: ... High Default Low Medium Low Medium High High Default Increase 10 Cool CFM 1040 1225 1380 1550 1555 1715 1920 2135 Default Cool CFM 960 1085 1225 1415 1430 1565 1790 1980 Decrease 10 Cool CFM 840 990 1085 1250 1280 1450 1580 1790 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch...

Page 15: ...45 1345 1545 1560 1740 1930 2125 Default Cool CFM 970 1145 1265 1395 1405 1565 1775 1945 Decrease 10 Cool CFM 885 1025 1110 1250 1270 1425 1610 1770 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage ther...

Page 16: ...High High Default Low Medium Low Medium High High Default Increase 10 Cool CFM 1050 1195 1315 1495 1515 1710 1870 2065 Default Cool CFM 960 1095 1220 1355 1360 1555 1755 1890 Decrease 10 Cool CFM 850 985 1095 1220 1215 1400 1555 1755 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP sw...

Page 17: ...1260 1410 1555 1565 1750 1970 2190 Default Cool CFM 980 1115 1255 1430 1445 1615 1805 1985 Decrease 10 Cool CFM 865 1020 1115 1280 1290 1470 1650 1805 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP switch settings Heat Modes Available Heating Blower Performance Table Single stage th...

Page 18: ... High High Default Low Medium Low Medium High High Default Increase 10 Cool CFM 1070 1235 1385 1535 1550 1720 1925 2005 Default Cool CFM 985 1110 1245 1395 1415 1605 1755 1970 Decrease 10 Cool CFM 870 1010 1110 1260 1280 1435 1610 1755 The effect of static pressure is included in air volumes shown The following control configurations are available See Installation Instructions for details and DIP ...

Page 19: ...ariable capacity integrated control transformer circuit breaker and door switch VARIABLE SPEED BLOWER MOTOR BAG ASSEMBLIES shipping location COLD END HEADER BOX PRESSURE SWITCHES VARIABLE SPEED COMBUSTION AIR INDUCER INNER BLOWER ACCESS PANEL SIGHT GLASS PRIMARY LIMIT SHIPPING BLOCK 135 UNITS ONLY FIGURE 1 ...

Page 20: ...e current exceeds this limit the breaker will trip and all unit operation will shut down The breaker can be manually reset by pressing the button on the face See FIGURE 3 CIRCUIT BREAKER CB8 PRESS TO RESET FIGURE 3 WARNING Shock hazard Disconnect power before servicing Integrated control is not field repairable If control is inoperable simply replace entire control Can cause injury or death Unsafe...

Page 21: ...justed accordingly to provide the appropriate air flow at any rate On the initial call for low fire the furnace will operate at 35 and will remain there until the heat call is satisfied or a call for high fire is initiated If there is a call for high fire the rate will increase by 10 if the current rate is above 60 However if the current rate is below 60 the rate will increase to 70 After this ini...

Page 22: ...DIFICATION SIGNAL W2 HEAT DEMAND FROM 2ND STAGE T STAT W1 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 SIGNAL Y2 THERMOSTAT 2ND STAGE COOL SIGNAL O THERMOSTAT SIGNAL TO HEAT PUMP REVERSING VALVE H 24V HUMIDIFIER OUTPUT DO NOT CONNECT TO COMFORTSENS...

Page 23: ...Page 23 SLP99UHV INTEGRATED CONTROL CONFIGURATION GUIDE FIGURE 5 ...

Page 24: ...fter the heating demand has been satisfied can be adjusted by moving switches 4 and 5 on the integrated control The unit is shipped from the factory with a blower off delay of 120 seconds The blower off delay affects comfort and is adjustable to sat isfy individual applications Adjust the blower off delay to achieve a supply air temperature between 90 and 110 F at the exact moment that the blower ...

Page 25: ...tory set at option A which has the greatest effect on blower motor performance TABLE 8 provides the cooling mode blower speed ramping options that will result from different switch settings The cooling mode blower speed ramping options are detailed below TABLE 8 Cooling Mode Blower Speed Ramping Ramping Option Switch 12 Switch 13 A factory Off Off B On Off C Off On D On On Ramping Option A Factory...

Page 26: ...LE 9 and TABLE 10 pro vides the heating mode blower speeds that will result from different switch settings FIGURE 6 indicates the effect the DIP switch settings have upon the heating airflow at vari ous furnace firing rates Refer to blower tables at the front of this manual for corresponding cfm values TABLE 10 High Heat Blower Speeds Thermostat Demand Blower Speed Adjustments DIP Switch Settings ...

Page 27: ...be pressed a second time while c is flashing to confirm command to delete codes Press the button until a solid is displayed to exit the Error Code Recall mode Field Test Mode Use the diagnostic push button to scroll through the menu as described above Release the button when the LED flashes to select the Field Test mode While in the Field Test mode the technician can Initiate furnace ignition and ...

Page 28: ...d No change blinking remain in field test mode Solid exit field test mode Solid c start pressure switch calibration TABLE 13 Idle Menu Options These options are displayed on the menu when the button is pressed during normal operation DISPLAY ACTION when button released No change displaying error history remain in diagnostic recall mode Solid 3 horizontal bars exit diagnostic recall mode Solid c cl...

Page 29: ...iod During that period hold push button until code stops blinking disappear for 2 seconds Integrated control will store code in memory and will automatically exit Field Test Mode and reset If second period expires or push button is held less than five seconds control will automatically exit Field Test Mode and go into IDLE mode without storing unit size code If this happens programming function mu...

Page 30: ...Two horizontal bars will display Steps to follow if the damper control module is displaying the soft disable code Confirm proper wiring between all devices thermostat damper control module indoor and outdoor Cycle power to the control that is displaying the soft disable code Put the room thermostat through set up Go to setup system devices thermostat edit then push reset Go to setup system devices...

Page 31: ...hes of water column pressure of high pressure switch on heat call measure inches of water column of operating pressure inspect vent and combustion air inducer for correct operation and restriction E226 High pressure switch failed closed Refer to troubleshooting in installation instruction Check high pressure switch for closed contacts measure inches of water column of operating pressure inspect ve...

Page 32: ...an mode is lower than cfm setting Restricted airflow Indoor blower is running at a reduced cubic feet per minute Cutback Mode The variable speed motor has pre set speed and torque limiters to protect the motor from damage caused by operating out of its designed parameters 0 to 0 8 inches water column total external static pressure Check filter and ductwork To clear replace filter if needed or repa...

Page 33: ...nit OPERATING SEQUENCE SYSTEM DEMAND SYSTEM RESPONSE System Condition Step Demand Relative Humidity Compressor Blower CFM COOL Comments 1st stage O G Status D NO CALL FOR DEHUMIDIFICATION Normal Operation 1 On On On Acceptable 24 VAC High 100 Compressor and indoor blower follow thermostat demand BASIC MODE only active on a Y1 thermostat demand Normal Operation 1 On On On Acceptable 24 VAC High 100...

Page 34: ... 70 Dehumidification call ONLY 1 On On On On Demand 0 VAC High 70 door unit energized after point has been reached in order to maintain room humidity setpoint ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING BASIC MODE only active on a Y1 thermostat demand Normal Operation 1 On On On On Acceptable 24 VAC High 100 Thermostat energizes gizes D on a call for de humidification Dehumidification...

Page 35: ...s a microprocessor which monitors varying conditions inside the motor such as motor workload The controller uses sensing devices to sense what posi tion the rotor is in at any given time By sensing the posi tion of the rotor and then switching the motor windings on and off in sequence the rotor shaft turns the blower All SLP99UHV blower motors use single phase power An external run capacitor is no...

Page 36: ...nd wait at least five minutes to allow capacitors to discharge before attempting to service motor Failure to wait may cause personal injury or death Power Choke L13 A choke coil is used on 4 and 5 ton units equipped with 1 hp motors The choke is located on the blower housing and is used to suppress transient current spikes Troubleshooting Motor Operation To verify motor operation see steps below 1...

Page 37: ...ohms or greater before performing tests TABLE 17 Ohm Meter Range Scale Measurement Range In Words ohms 2M two megohm two million ohms 0 2 000 000 200k two hundred kilohm two hundred thousand ohms 0 200 000 20k twenty kilohm twenty thousand ohms 0 20 000 2k two kilohm two thousand ohms 0 2 000 200 two hundred ohm 0 200 FIGURE 11 TEST A Measure the resistance between each of the three motor leads 3 ...

Page 38: ...al Low Drop Out 2 6 or greater 2 5 or less 1 1 NOTE A much higher than normal micro amp reading 15 for example may appear when checking flame signal 3 Flame Rollout Switches Flame rollout switch S47 is a high temperature limit located inside the burner box Each furnace is equipped with two identical switches The limit is a N C SPST manual reset limit connected in series with the primary limit S10 ...

Page 39: ...Page 39 Burner Box Assembly burner assembly rollout switch ignitor flame sensor burner box front cover remove screw to open cover sight glass intake air collar Cover plate 090XV60C model only FIGURE 14 ...

Page 40: ...te grated control section section A subsection 4 for more details The valve is internally redundant to assure safety shut off If the gas valve must be replaced the same type valve must be used A 24VAC 2 pin plug and gas control switch are located on the valve 24V applied to the pins enables valve operation Inlet and outlet pressure taps are located on the valve LPG change over kits are available f...

Page 41: ...r box secondary coil or vent system If the switch assembly is to be replaced replace the en tire assembly Individual switch components cannot be replaced Combustion Air Inducer Specifications Three phase AC induction motor Sealed ball bearings VFD controlled by the furnace control board Operates at 60 to 180Hz Voltage range 33 110 VAC Amp draw 0 75 1 0 Windings resistance 16 74 14 26 Speed range 1...

Page 42: ...econds Repeat this step until high pressure switch is closed 8 Decrease RPM by 50 check after 5 seconds Repeat this step until switch is open 9 Keep this RPM as RPM2 10 Calibration complete NOTE If after a successful calibration and a heat call is present the integrated control will by pass the prepurge state and go straight into ignitor warm up After calibration the integrated control stores the ...

Page 43: ...UBING or RED TUBING NEGATIVE BLACK TUBING POSITIVE Measuring Pressure Differential To Cold End Header Box Field Installed Measuring Device Red FIGURE 18 The CAI is installed on the cold end header box The cold end header box is a single piece made of hard plastic The box has an internal channel where the combustion air inducer creates negative pressure at unit start up The channel contains an orif...

Page 44: ...abled Outdoor Unit COMMUNICATING ENABLED OUTDOOR UNIT OPTIONAL OUTDOOR AIR SENSOR OPTIONAL DISCHARGE AIR SENSOR CLIP Y1 TO Y2 FOR TWO STAGE OPERATION Indoor Unit Controller Outdoor Unit Communicating Thermostat Single wire to terminal C Single wire to terminal C Unused wires Unused wires Communicating systems using the a communicating thermostat require four thermostat wires between the thermostat...

Page 45: ...NS BUILT INTO ALL COMMUNICATING OUTDOOR UNITS COMMUNICATING ENABLED FURNACE HEPA BYPASS FILTER X2680 HEPA INTERLOCK KIT PASS INDOOR BLOWER MOTOR COMMON WIRE THROUGH CURRENT LOOP SEE HEPA INTERLOCK KIT TAILS LVCS VENTILATION CONTROL SYSTEM SEE LVCS VENTILATION INSTRUCTIONS FOR DAMPER SENSOR WIRING NON COMMUNICATING 1 OR 2 STAGE AC OR HP UNIT COMMUNICATING ENABLED FURNACE C C door unit only COMMUNIC...

Page 46: ...ING SOLVENT CEMENT MARKING PVC CPVC Pipe and Fittings ULCS636 PVC CPVC Solvent Cement ABS to PVC or CPVC Transition Cement POLYPROPYLENE VENTING SYSTEM PolyPro by Duravent InnoFlue by Centrotherm UL 1738 CERTIFIED GAS VENTING SYSTEM IPEX System1738 Schedule 40 PVC Pipes and Fittings UL1738 IPEX System1738 PVC FGV Cement Primer CAUTION Solvent cements for plastic pipe are flammable liquids and shou...

Page 47: ...e furnace flue collar must be accessible for inspection TABLE 22 lists the available exhaust termination kits Joint Cementing Procedure All cementing of joints should be done according to the specifications outlined in ASTM D 2855 NOTE A sheet metal screw may be used to secure the intake pipe to the connector if desired Use a drill or self tapping screw to make a pilot hole 1 Measure and cut vent ...

Page 48: ...in the unit s top cap Intake air piping is independent of exhaust piping CAUTION Do not discharge exhaust into an existing stack or stack that also serves another gas appliance If vertical discharge through an existing unused stack is required insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack CAUTION The exhaust vent pipe operates under positive p...

Page 49: ...ated metal in exhaust or intake terminations Doing so will cause freeze ups and may block the terminations TABLE 23 MINIMUM VENT PIPE LENGTHS SLP99UHV MODEL MIN EQUIV VENT LENGTH EXAMPLE 070 15 ft 5 ft plus 2 elbows of 1 12 2 2 1 2 or 3 diameter pipe 090 110 5 ft plus 2 elbows of 2 2 1 2 or 3 diameter pipe 135 5 ft plus 2 elbows of 3 diameter pipe Any approved termination may be added to the minim...

Page 50: ... 118 114 2 15 86 64 9 135 88 38 157 138 113 109 3 10 81 59 N A 130 83 33 152 133 108 104 4 N A 76 54 125 78 28 147 128 103 99 5 71 49 120 73 23 142 123 98 94 6 66 44 115 68 18 137 118 93 89 7 61 39 110 63 13 132 113 88 84 8 56 34 105 58 N A 127 108 83 79 9 51 29 100 53 122 103 78 74 10 46 24 95 48 117 98 73 69 Standard Termination at Elevation 7501 10 000 Number of 90 Elbows Used 1 1 2 Pipe 2 Pipe...

Page 51: ... 39 N A 146 139 114 105 2 10 78 62 7 125 84 34 141 134 109 100 3 N A 73 57 N A 120 79 29 136 129 104 95 4 68 52 115 74 24 131 124 99 90 5 63 47 110 69 19 126 119 94 85 6 58 42 105 64 14 121 114 89 80 7 53 37 100 59 N A 116 109 84 75 8 48 32 95 54 111 104 79 70 9 43 27 90 49 106 99 74 65 10 38 22 85 44 101 94 69 60 Concentric Termination 7501 10 000 Number of 90 Elbows Used 1 1 2 Pipe 2 pipe 2 1 2 ...

Page 52: ...er pipe in horizontal runs of exhaust pipe Exhaust 6 Min FIGURE 26 SIDE VIEW 2 2 2 or TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL RIGHT HAND DISCHARGE SHOWN 3 2 45 MAX 45 MAX DO NOT transition from smaller to larger pipe in horizontal runs of exhaust pipe EXHAUST 12 max 2 2 When transitioning up in pipe size use the shortest length of 2 PVC pipe possible NOTE Exhaust pipe and intake ...

Page 53: ...eranda porch deck or balcony 12 7 feet 2 1m 3 feet 9m within a height 15 feet 4 5m above the meter regulator assembly 3 feet 9m 6 inches 152mm for appliances 10 000 pliances 10 000 Btuh 3kw and 50 000 pliances 50 000 Btuh 15kw 6 inches 152mm for appliances 10 000 Btuh 3kw 12 inches 305mm for appliances 10 000 Btuh 3kw and 100 000 Btuh 30kw 36 inches 9m for appliances 100 000 Btuh 30kw 3 feet 9m ab...

Page 54: ... IMPORTANT Do not use screens or perforated metal in exhaust or intake terminations Doing so will cause freeze ups and may block the terminations IMPORTANT For Canadian Installations Only In accordance to CSA International B149 installation codes the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches 305mm TA...

Page 55: ... exhaust out the roof and the intake out the side of the structure FIGURE 32 2 Intake and exhaust pipes should be placed as close together as possible at termination end refer to illustrations Maximum separation is 3 76mm on roof terminations and 6 152mm on side wall terminations NOTE When venting in different pressure zones the maximum separation requirement of intake and exhaust pipe DOES NOT ap...

Page 56: ...GURE 32 7 If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions piping must be supported At least one bracket must be used within 6 from the top of the elbow and then every 24 610mm as shown in FIGURE 33 to prevent any movement in any direction When exhaust and intake piping must be run up an outside wall the exhaust piping must be termin...

Page 57: ...tective shield is recommended The shield should be constructed using wood sheet metal or other suitable material All seams joints cracks etc in affected area should be sealed using an appropriate sealant 3 Exhaust pipe 45 elbow can be rotated to the side away from the combustion air inlet to direct exhaust away from adjacent property The exhaust must never be directed toward the combustion air inl...

Page 58: ... 5 127mm 18 MAX 457mm EXHAUST VENT INTAKE AIR OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT INSTALLATION OF DIRECT VENT WALL TERMINATION KIT 30G28 or 81J20 Inches mm Side View 12 305mm Min above grade or cumulation optional intake elbow FIGURE 36 2 EXTENSION FOR 2 PVC PIPE1 EXTENSION FOR 3 PVC PIPE 1 1 2 ACCELERATOR FURNACE EXHAUST PIPE FURNACE INTAKE PIPE 4 GLUE EXHAUST END FLUSH INTO TERMINATION F...

Page 59: ... the furnace and evaporator coil can drain together See FIGURE 42 FIGURE 45 and FIGURE 46 Upflow furnace FIGURE 45 In upflow furnace applications the field provided vent must be a minimum 1 to a maximum 2 length above the condensate drain outlet connection Any length above 2 may result in a flooded heat exchanger if the combined primary drain line were to become restricted Horizontal furnace FIGUR...

Page 60: ...ust slope down a minimum 1 4 per ft toward trap FIGURE 41 HorizontalFurnace4 Min to 5 Max above condensatedrain connection FurnaceCondensate DrainConnection From Evaporator Coil Optional Condensate Trap With Optional Overflow Switch FIGURE 42 Furnace With Evaporator Coil Using A Separate Drain Condensate DrainConnection Field Provided Vent 1 min 2 max above condensate connection Evaporator drain l...

Page 61: ...ain connection Condensate DrainConnection Evaporator drain line required Trap at coil is optional FIGURE 45 IMPORTANT When combining the furnace and evaporator coil drains together the A C condensate drain outlet must be vented to relieve pressure in order for the furnace pressure switch to operate properly Furnace with Evaporator Coil Using a Common Drain Unit shown in horizontal left hand discha...

Page 62: ...ection In Unit Condensate Drain Connection In Unit Vent To Drain Condensate Drain Connection In Unit Optional Condensate Drain Connection OptionalDrainPipingFromTrap DrainTrapAssembly Furnished DrainTrap Assembly with 1 2 inch Piping DrainTrap Assembly with 3 4 inch Piping 1 2 inch 3 4 inch 1 25 mm Min 2 50 mm Max Above Top Of Condensate Drain Connection In Unit 1 25 mm Min 2 50 mm Max Above Top O...

Page 63: ...3 minutes 6 Adjust the thermostat to deactivate the heating demand and again wait for the combustion air inducer to stop At this point the trap should be primed with sufficient water to ensure proper condensate drain operation BEFORE PLACING THE UNIT INTO OPERATION the unit smell all around the furnace area for gas Be sure to smell next to the floor because some gas is heavier than air and will se...

Page 64: ...the authority that has jurisdiction black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet The flexible connector can then be added between the black iron pipe and the gas supply line WARNING Do not over torque 800 in lbs or under torque 350 in lbs when attaching the gas piping to the gas valve Gas supply piping should not allow more than 0 5 W C drop in pressur...

Page 65: ... connect test gauge connection 3 Start unit on low heat 35 rate and allow 5 minutes for unit to reach steady state 4 While waiting for the unit to stabilize notice the flame Flame should be stable and should not lift from burner Natural gas should burn blue 5 After allowing unit to run for 5 minutes record manifold pressure and compare to value given in TABLE 32 6 Repeat steps 3 4 and 5 on high fi...

Page 66: ...d Installed Gas Valve MANIFOLD PRESSURE MEASUREMENT FIGURE 50 Negative Port Positive Port Gas Valve Measuring Device Field Installed Operating Signal Delta P Measurement Black Tubing Red and Black Tubing FIGURE 51 ...

Page 67: ...LE 31 also lists gas conversion kit requirements at all altitudes The combustion air pressure switch is factory set and re quires no adjustment TABLE 31 Conversion Kit High Altitude Requirements Model Input LP Propane Conversion Kit Natural Burner Kit 0 4500 ft 0 1372m 4501 10 000 ft 1372 3048m 4501 10 000 ft 1372 3048m 070 65W77 65W77 Not Required 090XV36C 48C 090XV60C 20A26 20A88 20A89 110 65W77...

Page 68: ...e readings to TABLE 33 If the readings exceed the maximum shown in the table make repairs before operating the furnace 2 In addition measure the AC voltage from Line Hot to Line Neutral spade terminals on the integrated control See FIGURE 52 This voltage should be in the range of 97 to 132 Vac TABLE 33 Furnace Status Measurement VAC Expected Maximum Power On Furnace Idle 0 3 2 CAI Ignitor Energize...

Page 69: ... the firing rate is acceptable increase blower speed to reduce temperature C External Static Pressure 1 Tap locations shown in FIGURE 53 2 Punch a 1 4 diameter hole in supply and return air plenums Insert manometer hose flush with inside edge of hole or insulation Seal around the hose with permagum Connect the zero end of the manometer to the discharge supply side of the system On ducted systems c...

Page 70: ...rom bottom 110V60C 3 2 from bottom 135V60D 1 5 from bottom TABLE 37 Sensor Type 2 Horizontal Left Unit a b 070V36B 19 center 090V36C 19 center 090V48C 3 2 from bottom 090V60C 1 2 from bottom 110V60C 3 2 from bottom 135V60D 1 5 from bottom Discharge Air Temperature Sensor Location Coil Plenum b a Horizontal Right AIR FLOW FIGURE 58 TABLE 38 Sensor Type 1 Horizontal Right Unit a b 070V36B 15 center ...

Page 71: ...ulting in an increase in the number of service calls Before using any filter with this system check the specifications provided by the filter manufacturer against the data given in the appropriate Lennox Product Specifications bulletin Additional information is provided in Service and Application Note ACC002 August 2000 TABLE 40 Furnace Cabinet Width Filter Size Side Return Bottom Return 17 1 2 16...

Page 72: ...sengage strain relief bushing and pull wiring and bushing through the hole in the blower deck 17 Remove the primary limit from the vestibule panel 18 Remove two screws from the front cabinet flange at the blower deck Spread cabinet sides slightly to allow clearance for removal of heat exchanger 19 Remove screws along vestibule sides and bottom which secure vestibule panel and heat exchanger assemb...

Page 73: ...nel Remove burner box from the unit 7 Use the soft brush attachment on a vacuum cleaner to gently clean the face of the burners Visually inspect the inside of the burners and crossovers for any blockage caused by foreign matter Remove any blockage 8 Reconnect the sensor wire and reconnect the 2 pin plug to the ignitor wiring harness 9 Reinstall the burner box assembly using the existing four screw...

Page 74: ...pre purge in ignition speed 3 After the pre purge is complete a 20 second initial ignitor warm up period begins The combustion air inducer continues to operate at the ignition speed 4 After the 20 second warm up period has ended the gas valve is energized and ignition occurs At the same time the control module begins an indoor blower 45 second ON delay When the delay ends the indoor blower motor i...

Page 75: ...or is adjusted to a speed which matches the target rate A fixed 10 minute third stage on delay is initiated 6 If the heating demand continues beyond the thirdstage on delay the integrated control energizes the inducer at high speed The indoor blower motor is adjusted to a speed which is appropriate for the target rate 7 When the thermostat heating demand is satisfied the gas valve is de energized ...

Page 76: ...ful Trial Wait For Ignition Stabilization Delay Post Purge 20Seconds Soft Lockout Error Code Flashes YES NO NO YES Call For Heat Ends NO YES YES NO C A L L F O R 1 S T S T A G E H E A T 3A 2 1 1 OR Call For Heat NO 4 Calibrations Attempted Calibration Successful Wait 5 minutes NO NO Soft Lockout Error Code Flashes YES YES YES 2 1 1 2 Set Target Firing Rate Based on Thermostat Signals Present SOFT ...

Page 77: ...O Error Code Flashes NO YES Wait 5 Minutes 3A 2 1 2 1 System will always light at 70 even if 2nd stage call for heat is in place If the high pressure switch does not close within 5 attempts the system will operate at low fire for the remainder of the call for heat at request Combustion Air Inducer ON 100 Rate Speed Increase Combustion Air Inducer Speed if Not at 100 Rate Speed Adjust Indoor Blower...

Page 78: ...ostat 1 4 3A 3B YES OR Combustion Air Inducer switched to 70 rate speed Adjust Indoor Blower to appropiate speed Combustion Air Inducer OFF after 20 Second Post Purge Indoor Blower OFF after OFF Delay RUN MODE 2 STAGE THEREMOSTAT 1ST OR 2ND STAGE CALL FOR HEAT ALL INPUTS MONITORED LIMIT PRESSURE CALL FOR HEAT COOL FLAME LEVEL RUN MODE SINGLE STAGE THERMOSTAT ALL INPUTS MONITORED LIMIT PRESSURE CAL...

Page 79: ...ror Code Flashes YES NO NO YES Call For Heat Ends NO YES YES NO C A L L F O R H E A T 3B 1 4 Move to Mid Firing Rate and High Firing Rate after 2nd and 3rd Stage Delays based on DIP Switch selections Pressure Switch Calibration Call For Heat NO 4 Calibrations Attempted Calibration Successful Wait 5 minutes NO NO Soft Lockout Error Code Flashes YES YES YES 1 2 1 2 1 Set to Low Firing Rate Indoor Bl...

Page 80: ...ode High Cooling mode High Cooling mode Per Ramping Profile NO NO YES NO 5 1 2 1 2 2 2 1 Indoor Blower On After 2 second delay Energize Indoor Blower Per Ramping Profile Energize Indoor Blower Maintain Indoor Blower Maintain Indoor Blower at De Energize Indoor Blower 2nd stage cooling operation requires a 2 stage thermostat a 2 stage cooling system and on board link W915 must be be cut The control...

Page 81: ...ooling 6 1 4 5 1 Call for Continuous Blower Indoor Blower On Maintain Indoor Blower at set speed Maintain Indoor Blower at set speed OR Maintain Indoor Blower at set speed Indoor Blower Per Indoor blower low cooling mode and high cooling mode have specific ON OFF and speed ramping profiles The specific profile is selected using the dip switches on the control 1 Go to Call for Heat Two Stage Thermo...

Page 82: ...at ON delay OFF 7 minutes ON 12 minutes ON Intact Intact Intact S1 T STAT CONTROL TERM STRIP OUTDOOR UNIT 1 Heat 2 Cool NOTE Use DIP switch 3 to set second stage heat ON delay OFF 7 minutes ON 12 minutes ON Cut Intact Intact S1 T STAT CONTROL TERM STRIP OUTDOOR UNIT 1 Heat 2 Cool with t stat with dehumidification mode NOTE Use DIP switch 3 to set second stage heat ON delay OFF 7 minutes ON 12 minu...

Page 83: ...g W914 DS to R cation or Harmony III W951 O to R Heat Pumps 2 Heat 2 Cool OFF Cut Intact Intact S1 T STAT CONTROL TERM STRIP OUTDOOR UNIT 2 Heat 2 Cool with t stat with tion mode OFF Cut Cut Intact S1 T STAT CONTROL TERM STRIP OUTDOOR UNIT 2 Heat 1 Cool OFF Intact Intact Intact S1 T STAT CONTROL TERM STRIP OUTDOOR UNIT R required on some units ...

Page 84: ...h 1 OFF Intact Intact Cut L7742U T STAT CONTROL 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 L7742U thermostat w bilities Capable of 2 stage gas heat control DIP Switch 1 OFF Cut Intact Cut CONTROL TERM STRIP HEAT PUMP out blue 67M41 H L Y2 D B L Y2 T T outdoor sensor L7742U T STAT Connect W1 to W1 ONLY if using defrost tempering k...