Lennox iComfort SL280UH070V36A Unit Information Download Page 77

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Page 77

Cooling Sequence of Operation

1ST STAGE COOLING

REQUEST RECEIVED

ENERGIZE 1ST STAGE

COOLING CONTACTOR

(COMPRESSOR & FAN)

2ND STAGE

COOLING

REQUEST?

YES

1ST STAGE

COOLING REQUEST

STILL ACTIVE?

YES

ENERGIZE 2ND STAGE

COOLING CONTACTOR

(COMPRESSOR & FAN)

DE−ENERGIZE 2ND

STAGE COOLING

CONTACTOR

(COMPRESSOR & FAN)

CONTROL WILL NOT RESPOND TO A 2ND STAGE COOLING REQUEST UNLESS A 1ST STAGE

COOLING REQUEST IS ACTIVE.

AND SPEED RAMPING PROFILES. THE SPECIFIC PROFILE IS SELECTED USING THE

DE−ENERGIZE 1ST

STAGE COOLING

CONTACTOR

(COMPRESSOR & FAN)

2ND STAGE

COOLING REQUEST

STILL ACTIVE?

COOLING REQUEST

STILL ACTIVE?

CALL FOR COOLING

WAIT FOR COMPRESSOR TIMED

OFF DELAY TO EXPIRE

INDOOR BLOWER 2

SECOND ON DELAY

YES

1ST STAGE

DE−ENERGIZE INDOOR

BLOWER

INDOOR BLOWER LOW COOLING MODE AND HIGH COOLING MODE HAVE SPECIFIC ON, OFF

ENERGIZE INDOOR BLOWER

(LOW COOLING MODE)

ENERGIZE INDOOR BLOWER

(HIGH COOLING MODE)

MAINTAIN INDOOR BLOWER

(HIGH COOLING MODE)

ENERGIZE AND MAINTAIN

INDOOR BLOWER AT

(LOW COOLING MODE)

DIP SWITCHES ON THE CONROL.

MAINTAIN INDOOR

BLOWER

(LOW COOLING MODE)

Summary of Contents for iComfort SL280UH070V36A

Page 1: ...lable for conversion to LPG operation SL280UH V X model units are equipped with a communicating SureLight two stage variable speed integrated control SL280UHV X unit meets the California Nitrogen Oxid...

Page 2: ...x 5 in adaptor See Venting Tables in the Installation Instructions for detailed information SPECIFICATIONS Gas Heating Performance Model No SL280UH090V60C SL280UH110V60C SL280UH135V60D Model No Low N...

Page 3: ...stage cooling speed minimum 250 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 250 cfm SL280UH070V36A BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Switch Settings Motor Watt...

Page 4: ...second stage cooling speed minimum 250 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 250 cfm SL28UH070V36A BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Switch Settings Moto...

Page 5: ...selected second stage cooling speed minimum 250 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 250 cfm SL280UH090V36B BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Switch Set...

Page 6: ...f the selected second stage cooling speed minimum 250 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 250 cfm SL280UH090V36B BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Switc...

Page 7: ...stage cooling speed minimum 380 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 380 cfm SL280UH090V48B BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Switch Settings Motor Watt...

Page 8: ...cond stage cooling speed minimum 380 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 380 cfm SL280UH090V48B BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Switch Settings Motor...

Page 9: ...selected second stage cooling speed minimum 380 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 380 cfm SL280UH090V48B BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Switch Set...

Page 10: ...of the selected second stage cooling speed minimum 450 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 450 cfm SL280UH090V60C BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Swit...

Page 11: ...ontinuous Fan Only speed is selectable at 28 and 38 of the selected second stage cooling speed minimum 450 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 450 cfm SL280UH090V60C...

Page 12: ...of the selected second stage cooling speed minimum 450 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 450 cfm SL280UH110V60C BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP Swi...

Page 13: ...n Continuous Fan Only speed is selectable at 28 and 38 of the selected second stage cooling speed minimum 450 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 450 cfm SL280UH110V...

Page 14: ...38 of the selected second stage cooling speed minimum 450 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 450 cfm SL280UH135V60D BLOWER MOTOR WATTS COOLING 1 Cooling Speed DIP...

Page 15: ...tion Continuous Fan Only speed is selectable at 28 and 38 of the selected second stage cooling speed minimum 450 cfm Lennox iHarmony Zoning System Applications Minimum blower speed is 450 cfm SL280UH1...

Page 16: ...R INDUCER BLOWER ASSEMBLY BURNER BOX INNER BLOWER ACCESS PANEL ACCESS PANEL SIGHT GLASS COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CONTROL BOX with blower drive in some units Not to scale SECOND...

Page 17: ...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 i...

Page 18: ...ized in two modes SINGLE STAGE thermostat or TWO STAGE thermostat The thermostat selection is made using a DIP switch and must be posi tioned for the particular application DIP switch 1 labeled T STAT...

Page 19: ...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...

Page 20: ...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 THERMOSTA...

Page 21: ...OFF OPTION B OFF 82 100 OFF OPTION C OFF 100 100 OFF OPTION D OFF 100 OFF DEFAULT 10 10 HIGH SPEED MEDIUM HIGH SPEED MEDIUM LOW SPEED LOW SPEED 7 PROTECTIVE PLASTIC FILM ON DIP SWITCHES MAY BE REMOVED...

Page 22: ...me signal mode The integrated control will display the flame current on 7 segment LED in micro amps uA Flame signal mode is exited after any of the following Power is reset Pressing and holding push b...

Page 23: ...arm clears 5 seconds after fault recovered E111 Low line voltage Reverse line power voltage wiring System resumes normal operation 5 seconds after fault recovered E112 Ground not detected System shuts...

Page 24: ...ge appropriate feature will be set as installed and that could be seen in About screen In normal operation after control recognizes sensors alarm will be sent if valid temperature reading is lost To g...

Page 25: ...for correct operation and restriction Resumes normal operation after fault is cleared E227 Low pressure switch open during trial for ignition or run mode Check pressure inches w c of low pressure swi...

Page 26: ...ing connections 1 hour soft lockout Clears when calibration has finished successfully E290 Ignitor circuit fault Failed ignitor or triggering cir cuitry Measure resistance of hot surface ignitor Repla...

Page 27: ...Volts between R O on integrated control with non communicating outdoor unit Dual fuel module required for heat pump application Configuration link R to O needs to be restored Replace link or hard wir...

Page 28: ...pressor open run circuit Required amount of current is not passing through Run current transformer Clears the error after current is sensed in RUN sensor or 1 normal compressor run cycle or after powe...

Page 29: ...ne voltage Line Voltage Low Voltage lower than nameplate rating Check power line voltage and correct Alarm clears 5 seconds after fault recovered E111 Low line voltage Reverse line power voltage wirin...

Page 30: ...d that could be seen in About screen In normal operation after control recognizes sensors alarm will be sent if valid temperature reading is lost To get rid of setting and alarm redo configu ration an...

Page 31: ...for correct operation and restriction Resumes normal operation after fault is cleared E227 Low pressure switch open during trial for ignition or run mode Check pressure inches w c of low pressure swi...

Page 32: ...ars when heat call finishes successfully E275 Soft lockout Flame sensed out of sequence Flame signal is gone Shut off gas Check for gas valve leak 1 hour soft lockout Clears when flame has been proven...

Page 33: ...operate but might not meet efficiency and capacity pa rameters Alarm will clear when commissioning is exited Cleared after commissioning is complete E334 Relay Y1 stuck on interated control Replace in...

Page 34: ...act moment that the blower is de energized Lon ger off delay settings provide lower supply air tempera tures shorter settings provide higher supply air tempera tures TABLE 4 provides the blower off ti...

Page 35: ...itch 11 Switch 12 Switch 13 Increase 24 On On On Increase 18 On On Off Increase 12 On Off On Increase 6 On Off Off Factory Default Off Off Off Decrease 6 Off Off On Decrease 12 Off On Off Decrease 18...

Page 36: ...mal 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...

Page 37: ...y allowing 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 Operation 1 On...

Page 38: ...eceives all neces sary functional parameters from the integrated control and does not rely on a factory program like traditional variable speed motors Units use a three phase electronically controlled...

Page 39: ...is called soft start The motor may take as long as 10 15 seconds to reach full speed If the motor does not reach 200 rpm within 13 seconds the motor shuts down Then the motor will immediately attempt...

Page 40: ...ine Voltage Connector J49 4 Pin Control Connector J48 5 Pin J49 4 Pin FIGURE 10 BLOWER B3 HARNESS CONNECTORS MOTOR with INTEGRATED CONTROLLER SHAFT P49 4 Pin P48 5 Pin P48 5 Pin P49 4 Pin J48 Connecto...

Page 41: ...T A Measure the resistance between each of the three motor leads 3 pin plug and the unpainted part of the end shield If the winding resistance to ground is 100k ohms replace the motor and control modu...

Page 42: ...set limit connected in series with the secondary limit S21 When S47 senses rollout the circuit breaks and the ignition control immedi ately stops ignition and closes the gas valve Rollout can be cause...

Page 43: ...3 HEATING COMPONENTS Ignitor Burner Assembly Sensor Gas Valve Burner Box Front Panel Screw remove and panel will swing open and off Rollout Switch Rollout Switch alternate location Rollout Switch FIGU...

Page 44: ...then then there is a problem with the wiring between the jack plug and control If the reading is not correct the issue is the ignitor Meter set to ohms Test 3 Insert meter probes into the terminals 1...

Page 45: ...cted to the combustion air inducer housing by means of a flexible silicone hose It monitors negative air pressure in the com bustion air inducer housing The switches are a single pole single throw pro...

Page 46: ...ombustion air inducer then reinstall the mounting screws See unit Installation Instructions for more detail IMPORTANT The combustion air pressure switch must be moved for horizontal discharge air left...

Page 47: ...W under cap FIGURE 19 GAS VALVE SHOWN IN ON POSITION MANIFOLD PRESSURE TAP ON SIDE HIGH FIRE ADJUSTING SCREW under cap INLET PRESSURE TAP ON SIDE Resideo Two Stage Gs Valve FIGURE 20 9 Turn switch on...

Page 48: ...fore pressure testing to iso late furnace from gas supply MANUAL MAIN SHUT OFF VALVE WILL NOT HOLD TEST PRESSURE IN EXCESS OF 0 5 PSIG 14 W C GAS VALVE CAP GAS PIPING TEST PROCEDURE FIELD PROVIDED LIN...

Page 49: ...s incorrect check gas orifices for proper size and restriction NOTE To obtain accurate reading shut off all other gas appliances connected to meter G Proper Combustion Furnace should operate minimum 1...

Page 50: ...or these units 2 Natural gas high altitude orifice kit required 3 A natural to L P propane gas changeover kit is necessary to convert this unit Refer to the changeover kit installation instruction for...

Page 51: ...RE RISE Supply Duct Temperature ________ Return Duct Temperature _ _____ Temperature Rise ________ FIGURE 22 C External Static Pressure 1 Tap locations shown in FIGURE 23 2 Punch a 1 4 diameter hole i...

Page 52: ...e and connections for leaks 4 Check the cleanliness of filters and change if necessary monthly 5 Check the condition and cleanliness of burners and heat exchanger and clean if necessary 6 Check the cl...

Page 53: ...E 24 9 Remove screws from both sides top and bottom of vestibule panel 10 Remove heat exchanger It may be necessary to spread cabinet side to allow more room If so remove five screws from the left sid...

Page 54: ...26 VII Wiring and Sequence of Operation Integrated Control Self Check When there is a call for heat the integrated control runs a self check The control checks for S10 primary limit S21 secondary lim...

Page 55: ...Page 55 Wiring Diagram With Ignition Control 103130 XX...

Page 56: ...Page 56 Wiring Diagram With Ignition Control 103130 XX and Units With Blower Drive...

Page 57: ...Page 57 Wiring Diagram With Ignition Control 107045 XX...

Page 58: ...at demand for low fire first stage heat is satisfied the gas valve is de energized and the field selected indoor blower off delay begins The combustion air inducer begins a 5 second post purge period...

Page 59: ...GE AIR SENSOR CLIP ON BOARD LINK W915 Y1 TO Y2 FOR TWO STAGE OPERATION Communicating Integrated Control Communicating Thermostat Outdoor Unit nace air handler control and four wires between the outdoo...

Page 60: ...s 18 RSBus Rf W Gh Gs Cf HVAC EQUIP DEHUMIDIFIER CONTROL HVAC EQUIPMENT DH 24V IN JUMPER COMMUNICATING ENABLED FURNACE COMMUNICATING ENABLED FURNACE ICOMMUNICATING THERMOSTAT CONVENTIONAL NON COMMUNIC...

Page 61: ...DOOR UNIT LENNOX COMMUNICATING THERMOSTAT OR DAMPER CONTROL MODULE CONVENTIONAL TERMINALS FLOAT SWITCH LENNOX COMMUNICATING INDOOR UNIT CONVENTIONAL OUTDOOR UNIT 1 OR 2 STAGE LENNOX COMMUNICATING FURN...

Page 62: ...N 12 minutes 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 BOAR...

Page 63: ...RD 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...

Page 64: ...ol OFF CUT ON BOARD LINK W951 HEAT PUMP 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 thermostat w bilities Capable of 2 sta...

Page 65: ...MP CUT ON BOARD LINK W914 DEHUM OR HARMONY 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 thermostat w bilities Capable of 2...

Page 66: ...FOR TWO STAGE OPERATION Communicating Integrated Control Communicating Thermostat Outdoor Unit nace air handler control and four wires between the outdoor unit and the furnace air handler control Whe...

Page 67: ...otal length of all con nections on the RSBus is limited to 1500ft Wire gauge of RSBus wire is 18 RSBus Rf W Gh Gs Cf HVAC EQUIP DEHUMIDIFIER CONTROL HVAC EQUIPMENT DH 24V IN JUMPER COMMUNICATING ENABL...

Page 68: ...IT LENNOX COMMUNICATING INDOOR UNIT LENNOX COMMUNICATING THERMOSTAT OR DAMPER CONTROL MODULE CONVENTIONAL TERMINALS FLOAT SWITCH LENNOX COMMUNICATING INDOOR UNIT CONVENTIONAL OUTDOOR UNIT 1 OR 2 STAGE...

Page 69: ...2 minutes ON DO NOT CUT ANY ON BOARD LINKS S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT H 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...

Page 70: ...INK W915 2 STAGE COMPR S1 T STAT FURNACE TERM STRIP OUTDOOR UNIT H 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 71: ...T ON BOARD LINK W951 HEAT PUMP L7742U T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor H Dual Fuel Two Stage Heat Pump ComfortSense thermostat w bilities Capable of 2 sta...

Page 72: ...T ON BOARD LINK W914 DEHUM OR HARMONY L7742U T STAT FURNACE TERM STRIP HEAT PUMP 67M41 Y H L Y2 D B L Y2 T T outdoor sensor H Dual Fuel Two Stage Heat Pump ComfortSense thermostat w bilities Capable o...

Page 73: ...ntegrated 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 au...

Page 74: ...S H S I 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 LOCK...

Page 75: ...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 CODE FLA...

Page 76: ...AGE 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 INDUCER OFF...

Page 77: ...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 ACTIVE CALL F...

Page 78: ...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 BLOWER AT CON...

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