Lennox SL280UH090V36B, SL280DF070V36A, SL280UH070V36A, SL280UH090V48B, SL280UH090V60C Unit Information

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Corp. 1117-L4

Service Literature

Revised 06-2016

icomfort® ENABLED SL280DFV SERIES UNITS

SL280DFV series units are 80% efficiency gas furnaces

used for downflow applications only, manufactured with

Lennox Duralok heat exchangers formed of aluminized

steel. Units are available in heating capacities of 66,000 to

110,000 Btuh and cooling applications up to 5 tons. Refer to

Engineering Handbook for proper sizing.

Units are factory equipped for use with natural gas. Kits are

available for conversion to LPG operation. SL280DFV mod

el units are equipped with the icomfort

two-stage variable speed integrated control. All units use a

redundant gas valve to assure safety shut-off as required by

CSA.

All specifications in this manual are subject to change. Pro

cedures outlined in this manual are presented as a recom

mendation only and do not supersede or replace local or

state codes. In the absence of local or state codes, the

guidelines and procedures outlined in this manual (except

where noted) are recommendations only and do not consti

tute code.

TABLE OF CONTENTS

Specifications Page 2.............................

Parts Identification Page 3.........................

I Unit Components Page 4........................

II Installation Page 29............................

III Start Up Page 29..............................

IV Heating System Service Checks Page 31.........

V Typical Operating Characteristics Page 34.........

VI Maintenance Page 34..........................

enabled SureLight

SL280DFV

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, person al injury or loss of life. Installation and service must be performed by a licensed professional HVAC in staller (or equivalent), service agency or the gas sup plier.

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at discon nect switch(es). Unit may have multiple power supplies.

VII Wiring and Sequence of Operation Page 38......

VIII Program Unit Capacity Size Mode Page 42......

IX Field Wiring and Jumper Settings Page 43........

X Troubleshooting Flow Chart Page 47..............

Page 1

CAUTION

As with any mechanical equipment, contact with sharp sheet metal edges can result in personal in jury. Take care while handling this equipment and wear gloves and protective clothing.

SPECIFICATIONS

Gas Heating Performance

High Fire

Temperature rise range - °F 35-65 35-65 35-65 35-65

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

Low Fire

Temperature rise range - °F 25-55 25-55 25-55 25-55

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

High static - in. w.g. Heating 0.8 0.8 0.8 0.8

Connections

Flue connection - in. round 4 4 4 4

in.

Indoor

Wheel nominal diameter x width - in. 10 x 8 11 x 9 11 x 10 11 x 10

Blower

Tons of add-on cooling 2 - 3 3 - 4 3.5 - 5 3.5 - 5

Air Volume Range - cfm 589 - 1514 830 - 1996 899 - 2273 882 - 2120

Electrical Data

Blower motor full load amps 7.7 12.8 12.8 12.8

Maximum overcurrent protection 15 20 20 20

Shipping Data lbs. - 1 package 130 153 164 173

NOTE - Filters and provisions for mounting are not furnished and must be eld provided.

Annual Fuel Utilization Efciency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non-weatherized

furnaces.

Model No. SL280DF070V36A SL280DF090V48B SL280DF090V60C SL280DF110V60C

AFUE 80% 80% 80% 80%

Input - Btuh 66,000 88,000 88,000 110,000

Output - Btuh 52,000 69,000 70,000 87,000

3.5 / 10.0 3.5 / 10.0 3.5 / 10.0 3.5 / 10.0

Input - Btuh 43,000 57,000 57,000 72,000

Output - Btuh 35,000 46,000 46,000 59,000

1.7 / 4.9 1.7 / 4.9 1.7 / 4.9 1.7 / 4.9

Cooling 1.0 1.0 1.0 1.0

Gas pipe size IPS 1/2 1/2 1/2 1/2

Motor output - hp 1/2 1 1 1

Voltage 120 volts - 60 hertz - 1 phase

OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA

“A” Width

Models

CABINET ACCESSORIES

Downow Combustible Flooring Base 11M59 11M60 11M61

CONTROLS

ComfortSense® 7000 Thermostat Y0349 Y0349 Y0349

Remote Outdoor Sensor (for dual fuel and Humiidtrol

) X2658 X2658 X2658

DOWNFLOW FILTER KITS

Downow Filter Kit 51W06 51W07 51W08

No. and Size of lter - in. (1) 20 x 16 x 1 (2) 20 x 20 x 1 (2) 20 x 20 x 1

NIGHT SERVICE KITS

Night Service Kit 16S36 16S36 16S36

Safety Service Kit 89W19

“B” Width

Models

“C” Width

Models

89W19 89W19

GAS HEAT ACCESSORIES

Models

Natural Gas to

LPG/Propane Kit

all 11K51 11K46

LPG/Propane to

Natural Gas Kit

Page 2

FLUE CHASE

CONTROL BOX

(Includes two-stage integrated control,

transformer and circuit breaker)

INTERNAL FLUE PIPE ASSEMBLY

PARTS IDENTIFICATION

BLOWER ASSEMBLY

GASKET

SECONDARY LIMIT

DOOR INTERLOCK SWITCH

ROLLOUT SWITCH

INNER BLOWER ACCESS PANEL

ACCESS PANEL

PRIMARY LIMIT LOCATION

HEAT EXCHANGER

COMBUSTION AIR INDUCER

PRESSURE SWITCHES

COMBUSTION AIR INDUCER

GAS VALVE

BURNER BOX ASSEMBLY

FIGURE 1

Page 3

I-UNIT COMPONENTS

Unit components are shown in figure 1. The gas valve, combustion air inducer and burners can be accessed by re moving the access panel. Electrical components are in the control box (figure 2) found in the blower section.

CIRCUIT BREAKER CB8

PRESS TO RESET

FIGURE 3

CAUTION

Electrostatic discharge can affect elec tronic components. Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control.

A- Control Box

1. Control Transformer (T1)

A transformer located in the control box provides power to the low voltage section of the unit. Transformers on all models are rated 40VA with a 120V primary and a 24V sec ondary.

2. Door Interlock Switch (S51)

An interlock switch rated 14A at 125VAC is wired in series with line voltage. When the indoor blower access panel is removed the unit will shut down.

CONTROL BOX SL280DFV

Transformer

Interlock Switch

WARNING

Shock hazard. Disconnect power before servicing. Integrated

control is not field repairable.

If control is inoperable, simply replace entire con trol.

Can cause injury or death. Unsafe operation will result if repair is attempted.

4. SureLight Integrated Control (A92)

Units are equipped with the icomfort enabled Sur

eLight control is used with the icomfort Wi-Fi of a communicating comfort system. The control can also operate with a non-communicating conventional single or two-stage thermostat. The system consists of a ignition / blower control (figures 4 and 5) with control pin designa tions in tables 1, 2 and 3 and ignitor (figure 13). The control and ignitor work in combination to ensure furnace ignition and ignitor durability. The control provides gas ignition, safety checks and indoor blower control with two-stage gas heating. The furnace combustion air inducer, gas valve and indoor blower are controlled in response to various system inputs such as thermostat signal, pressure and limit switch signal and flame signal. The control features a seven-seg ment LED display, indicating furnace status (including in door blower) and error codes. The LED flashes in single digits. For example using table 5 under LIMIT CODE, an “E” followed by “2” followed by “5” followed by “0”, the limit switch circuit is open. The control also has two unpowered (dry) 1/4” contacts for a humidifier and a 120 volt accessory terminal. Both rated at (1) one amp each.

two-stage, variable speed integrated control. This

thermostat as part

Circuit Breaker

SureLight

Integrated Control

FIGURE 2

3. Circuit Breaker (CB8)

A 24V circuit breaker is also located in the control box. The switch provides overcurrent protection to the trans former (T1). The breaker is rated 3A at 32V. If the current exceeds this limit the breaker will trip and all unit opera tion will shutdown. The breaker can be manually reset by pressing the button on the face. See figure 3.

Electronic Ignition

At the beginning of the heat cycle the integrated control monitors the first stage and second stage combustion air inducer prove switch. The control will not begin the heating cycle if the first stage prove switch is closed (by-passed). Likewise the integrated control will not begin the second stage heating cycle if the second stage prove switch is closed, and will remain in first stage heat. However, if the second stage prove switch closes during the first stage heat pre-purge, the control will allow second stage heat. Once the first stage prove switch is determined to be open,

Page 4

the combustion air inducer is energized on low (first stage) heat speed. When the differential in the prove switch is great enough, the prove switch closes and a 15-second pre-purge begins.

NOTE - During abnormal conditions such as low supply voltage or low outdoor temperatures and the low fire pres sure switch does not close, the combustion air inducer will switch to high fire. After a 15 second pre-purge the high fire pressure switch will close and the unit will begin operation on high fire. After 10 to 20 seconds of high fire operation the unit will switch to low fire

After the 15-second pre-purge period, the SureLight ignitor warms up for 20 seconds after which the gas valve opens for a 4-second trial for ignition. The ignitor energizes during the trial until flame is sensed. If ignition is not proved during the 4-second period, the control will try four more times with an inter purge and warm-up time between trials of 35 sec onds. After a total of five trials for ignition (including the ini tial trial), the control goes into Watchguard-Flame Failure mode. After a 60-minute reset period, the control will begin the ignition sequence again.

Two Stage Operation / Thermostat Selection DIP Switch

The control can be utilized 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 HEAT STAGE is factory-set in the OFF position for use with a two-stage thermostat. Move the DIP switch to ON for use with a single stage thermostat. While in the single-stage thermostat mode (single DIP switch setting), the burners will always fire on first-stage heat. The combustion air inducer will operate on low speed and indoor blower will operate on low heat speed. After a factory default 10 minute recognition period, the unit will switch to second stage heat. While in the two-stage ther mostat mode (two DIP switch setting) the burners will fire on first-stage heat. The combustion air inducer will operate on low speed and indoor blower will operate on low heat speed. The unit will switch to second-stage heat on call from the indoor thermostat. If there is a simultaneous call for first and second stage heat, the unit will fire an first stage heat and switch to second stage heat after 30 seconds of operation. See Sequence of Operation flow charts in the back of this manual for more detail.

TABLE 1

SureLight

Control 5 Pin Terminal Designation

PIN # Function

1 Ignitor

2 Combustion Air Inducer High Speed

3 Combustion Air Inducer Low Speed

4 Combustion Air Inducer Neutral

5 Ignitor Neutral

TABLE 2

SureLight

Control 12 Pin Terminal Designation

PIN # Function

1 Gas Valve High Fire

2 Second Stage Prove Switch

3 Rollout In

4 Ground

5 24V Hot

6 Primary Limit In

7 Gas Valve Low Stage

8 Gas Valve Common

9 24V Neutral

10 Ground

11 Rollout Switch Out

12 1st Stage Prove Switch

TABLE 3

SureLight

Control 6 Pin Terminal Designation

PIN # Function

1 Data Input From Motor

2 Common

3 Not Used

4 Data Output To Motor

5 5 Volt Bias Supply

6 Not Used

Page 5

HUM

LINE 1

7 SEGMENT LED

FLAME SENSE

DIAGNOSTIC

PUSH BUTTON

DIP SWITCHES

INTEGRATED CONTROL

ACC

HS/ CAI

INDOOR

BLOWER

CONNECTOR

NEUTRAL

OUTDOOR AIR

SENSOR

TERMINALS

DISCHARGE AIR

SENSOR

TERMINALS

TB83

COMMUNICATING

OUTDOOR

EQUIPMENT

I + I -CRI + I -

TB84

COMMUNICATING

INDOOR

THERMOSTAT

RS-BUS LINK (TB82, future use)

I+ = DATA HIGH CONNECTION I - = DATA LOW CONNECTION

RS-BUS OUTDOOR (TB83)

R = 24VAC I + = DATA HIGH CONNECTION I - = DATA LOW CONNECTION C = 24VAC COMMON

RS-BUS INDOOR (TB84)

R = 24VAC I + = DATA HIGH CONNECTION I - = DATA LOW CONNECTION C = 24VAC COMMON

1/4” QUICK CONNECT TERMINALS

HUM = UNPOWERED NORMALLY OPEN (DRY) CONTACTS

XMFR = 120 VAC OUTPUT TO TRANSFORMER

LI = 120 VAC INPUT TO CONTROL

ACC = 120 VAC OUTPUT TO OPTIONAL ACCESSORY

NEUTRALS = 120 VAC NEUTRAL

W1 W2 GY2Y1

NON-COMMUNICATINGNG

24V TERMINALS

12 PIN LOW

VOLTAGE

CONNECTOR

W915 Y1 TO Y2

2 STAGE COMPR

W951 R TO O HEAT PUMP

W914 R TO DS

DEHUM OR

RDHLODS

HARMONY

THERMOSTAT CONNECTIONS (TB1)

DS = DEHUMIDIFICATION 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

DH = DEHUMIDIFICATION OUTPUT COMMUNICATING

L = USE ONLY WITH A COMMUNICATING THERMOSTAT

AND A NON-COMMUNICATING OUTDOOR UNIT

REVERSING VALVE

THERMOSTAT ONLY

FIGURE 4

Page 6

THERMOSTAT SELECTION

TWO STAGE

THERMOSTAT

1−STAGE

THERMOSTAT

(TIMED STAGING)

−SEE SW #2

HEATING BLOWER−OFF DELAY

90 SECOND

HTG BLOWER

OFF DELAY

60 SECOND

HTG BLOWER

OFF DELAY

120 SECOND

HTG BLOWER

OFF DELAY

180 SECOND

HTG BLOWER

OFF DELAY

−BLOWER ON DELAY − 30 SEC. FIXED

HEATING MODE BLOWER SPEED

+ 24%

+ 18%

+ 12%

INCREASE AIR HTG CFM

+ 6%

FACTORY

DEFAULT

− 6%

− 12%

DECREASE AIR HTG CFM

− 18%

INTEGRATED CONTROL CONFIGURATION GUIDE

2ND STAGE HEAT ON DELAY

INDOOR EQUIPMENT

HEAT PUMP LINK

(JUMPERS R to O)

7 MIN

UPSTAGE

DELAY

12 MIN

UPSTAGE

DELAY

DIAGNOSTIC

PUSH BUTTON

FLAME SENSE

123456

S4S3

911

OUTDOOR

SENSOR

DISCHARGE

AIR SENSOR

I+ I−

RI+ I−CRI+ I− C

OUTDOOR EQUIPMENT

1−STG COMPRESSOR

W915

2 STAGE

COMPR

DO NOT CUT

2−STG COMPRESSOR

W915

2 STAGE

COMPR

CUT LINK

2−STAGE

COMPRESSOR LINK

(JUMPERS Y1 to Y2)

W915

CLG BLOWER SPEED ADJUSTMENT

HUM

W1W2 G Y2 Y1 C C DHL O DSR

HEAT PUMP UNIT

DEFAULT

ACC

W2GY2

ON−BOARD LINK

OPTION SELECTION

A/C UNIT

W951

HEAT PUMP

DO NOT CUT

W951

HEAT PUMP

CUT LINK

W951

+ 10%

− 10%

DIAGNOSTIC

LED

SureLight

HSI/CAI

IGN

CAI1

CAI2

P79

NO HARMONY ZONING

NO SIGNATURESTAT

W/ DS CONNECTION

110

4 7

CUT FOR

OPTION

SELECTION

W915

2 STAGE

COMPR

W951 HEAT

PUMP W914

DEHUM

HARMONY

DO NOT CUT

W914

DEHUM

HARMONY

HARMONY ZONING

SIGNATURESTAT W/

DS CONNECTION

CUT LINK

W914

DEHUM

HARMONY

DEHUMIDIFICATION−

HARMONY LINK

(JUMPERS R to DS)

W914

CONTINUOUS FAN MODE BLOWER SPEED

NEUTRALS

MEDIUM−LOW

SPEED

(38%)

MEDIUM−HIGH

SPEED

(70%)

LOW

SPEED

(28%)

HIGH SPEED (100%)

COOLING MODE BLOWER SPEED

HIGH

SPEED

MEDIUM−HIGH

SPEED

MEDIUM−LOW

SPEED

LOW

SPEED

COOLING MODE BLOWER RAMPING

OPTION A

OFF−50%−82%−

100%−50%−OFF

OPTION B

OFF−82%−100%−OFF

OPTION C

OFF−100%−100%−OFF

OPTION D

OFF−100%−OFF

−CUT ON−BOARD LINK (SOLDER TRACE) COMPLETELY THROUGH

BOTH LAYERS ON THE CONTROL BOARD

−LINKS CUT IN ERROR −INSTALL A JUMPER ON THE APPROPRIATE TERMINALS ON THE TERMINAL STRIP

−PROTECTIVE PLASTIC FILM ON DIP SWITCHES MAY BE REMOVED FOR EASE IN SETTING OF DIP SW.

* FACTORY DEFAULT

FIGURE 5

Page 7

TABLE 4

Integrated Control Diagnostic Modes

Display Action (when button released)

No change (idle)* Remain in idle mode

Solid “E” Enter diagnostic recall mode

Solid “D” Discharge Air Installed

Solid “F” Enter flame signal mode

Solid “P” (variable speed only) Program unit capacity/size (Unit Code)

* No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code, heat state, etc..)

Diagnostic LED (Figure 4)

The seven-segment diagnostic LED displays operating status, target airflow, error codes and other information. The table beginning on Page 9 lists diagnostic LED codes.

Flame Signal Mode

Select ”F” from the menu to access the flame signal mode. The integrated control will display the flame current on 7 segment LED in in micro amps (uA).

Flame signal mode is exited after any of the following:

Diagnostic Push Button (Figure 4)

The diagnostic push button is located adjacent to the seven-segment diagnostic LED. This button is used to en able the Error Code Recall “E” mode and the Flame Signal “F” mode. Press the button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. When the button is released, the displayed item will be selected. Once all items in the menu have been displayed, the menu resumes from the beginning until the button is released.

Error Code Recall Mode

Select ”E” from the menu to access the most recent 10 error codes. Select “c” from the Error Code Recall menu to clear all error codes. Button must 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.

 Power is reset  Pressing and holding push button until 3 horizontal

lines “≡” are displayed

 10 minutes after entering the flame sense mode.

Program Unit Capacity/Size Mode

After the “P” is selected (by releasing the push button) the integrated control will start flashing the “P” on display for 90 seconds. If push button is pressed again and held during that time, the control will start to display characters corre sponding to different variable speed furnace models for 3 seconds each. While the wanted character-model is dis played push button has to be released. Selected option will flash display for 10 seconds and during that time push but ton has to be pressed and held for 5 seconds. Once control accepts new setting it will store data in non-volatile memory and reset itself. If 10 seconds expires or push button is held less than 5 seconds, control will exit field test mode and go into idle without changing programming the unit size.

Page 8

TABLE 5

Integrated Diagnostic Codes/Status of Equipment I.

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

Idle mode (Decimal blinks at 1 Hertz -- 0.5 second ON, 0.5 second OFF).

dF U E 105

E 110

E 111

E 112

E 113

E 114

E 115

E 116

E 117

E 120

Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm setting for current mode displayed.

Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes).

Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting dis played / Pause / Repeat Codes).

Heat pump stage (1 second ON, 0.5 second OFF) / % of input rate dis played / Pause / cfm setting / Pause / Repeat codes.

Gas Heat Stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes. Blinking during ignition.

Defrost mode.

Discharge Air Temperature

Device communication problem - No other devices on RS BUS (Commu nication system).

Low line voltage. Line Voltage Low (Voltage lower than nameplate

Line voltage polarity reversed. Reverse line power voltage wiring. System resumes

Ground not detected System shuts down. Provide proper earth ground.

High line voltage. Line Voltage High (Voltage higher than nameplate

Line voltage frequency out-of-range. No 60 Hertz Power. Check voltage and line power

Low 24V - Control will restart if the error recovers. 24-Volt Power Low (Range is 18 to 30 volts). Check

High 24V. 24 Volt Power High (Range is 18 to 30 volts). Check

Poor ground detected (Warning only) Provide proper grounding for unit. Check for proper

Unresponsive device. Communication only. Usually caused by delay in outdoor unit responding

Equipment is unable to communicate. Indicates numerous message errors. In most cases errors are related to electrical noise. Make sure high voltage power is separated from RSBus. Check for miswired and/or loose connections between the stat, indoor unit and outdoor unit. Check for a high volt age source of noise close to the system. Fault clears after communication is restored.

rating). Check power line voltage and correct. Alarm clears 5 seconds after fault recovered.

normal operation 5 seconds after fault recovered.

System resumes normal operation 5 seconds after fault recovered.

rating). Provide power voltage within proper range. System resumes normal operation 5 seconds after fault recovered.

frequency. Correct voltage and frequency problems. System resumes normal operation 5 seconds after fault recovered.

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 recovered.

and correct voltage. Check for proper line voltage (120V, 240V, etc.) to equipment. Clears when con trol senses proper voltage.

earth ground to the system. Warning only will clear 30 seconds after fault recovered.

to indoor unit poling. Recycle power. Check all wir ing connections. Cleared after unresponsive device responds to any inquiry.

Page 9

TABLE 5 Continued

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

E 124

Active communicating thermostat signal missing for more than 3 min utes.

E 125

Control failed self-check, internal error, failed hardware. Will restart if error recovers. Integrated control not communicating. Covers hardware errors (flame sense circuit faults, pin shorts, etc.).

E 126

Control internal communication problem. Hardware problem on the control. Cycle power on

E 131

Corrupted control parameters (Verify configuration of system). Communi cating only.

E 180

Outdoor air temperature sensor failure. Only shown if shorted or out-ofrange.

E 200

Hard lockout - Rollout circuit open or previously open. Correct cause of rollout trip, or replace flame rollout

E 201

Indoor blower communication failure - Unable to communicate with blow er motor.

E 202

Indoor blower motor mis-match - Indoor motor horsepower does not match unit capacity. See Page 41.

E 203

Appliance capacity / size is NOT programmed. Invalid unit codes refer to configuration flow chart. See Page 41.

E 204

Gas valve mis-wired. Check gas valve operation and wiring. Clears when

E 205

Gas valve control relay contact shorted. Check wiring on control and gas valve. If wiring is

Equipment lost communication with the thermostat. Check four wiring connections, ohm wires and cycle power at the thermostat. Alert stops all services and waits for heartbeat message from thermostat (sub net controller). Cleared after valid thermostat (sub net controller) message is received.

Hardware problem on the control. Cycle power on control. Replace if problem prevents service and is persistent. Critical alert. Cleared 300 seconds after fault recovered.

control. Replace if problem prevents service and is persistent. Cleared 300 seconds after fault recov ered.

Reconfigure the system. Replace control if heating or cooling is not available. Only applicable in the communicating mode, not in startup. Exit from Com missioning and Execute 'Set Factory Default mode'. Control will still operate on default parameter set tings.

Compare outdoor sensor resistance to temperature/ resistance charts in unit installation instructions. Replace sensor pack if necessary. At beginning of (any) configuration, furnace or air handler control will sense outdoor air and discharge air temperature sensor(s). If detected (reading in range), appropri ate 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 get rid of set ting and alarm, redo configuration and make sure that temperature sensor is marked as 'not installed' in Indoor Unit 'About' screen. When Indoor unit con trol is replaced, thermostat will 'tell' new control if temperature sensor is in system or not. Clears 30 seconds after fault recovered.

switch. Test furnace operation. Cleared after fault recovered.

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 control or motor side. Cleared after fault recovered.

Incorrect appliance capacity code selected. Check for proper configuring under: Unit Size Codes for Furnace/Air Handler on configuration guide or in installation instructions. Cleared after the correct match is detected following a reset. (Remove ther mostat from system while applying power and re programming.)

No appliance capacity code selected. Check for proper configuring under: Unit Size Codes for Fur nace on configuration guide or in installation instruc tions. Critical Alert. Cleared after valid unit code is read following a reset. (Remove thermostat from system while applying power and reprogramming.)

repaired.

correct, replace control.

Page 10

TABLE 5 Continued

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

E 206

E 207

E 223

E 224

E 225

E 226

E 227

E 228

E 229

E 240

E 241

E 250

E 252

E 270

Gas valve second-stage relay failure Furnace will operate on 1st stage for remainder of

the heating demand. Will clear after fault recovered. If unable to operate 2nd stage, replace control.

Hot surface ignitor sensed open - Refer to troubleshooting. SeePage 46. Measure resistance of hot surface ignitor. Replace if

open or not within specified range found in IOM. Resumes normal operation after fault is cleared.

Low pressure switch failed open. Check pressure (inches w.c.) of low pressure switch

closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air in ducer for correct operation and restriction. Re sumes normal operation after fault is cleared

Low pressure switch failed closed - Refer to troubleshooting. See Page 46.

High pressure switch failed open - Refer to troubleshooting. See Page 46.

High pressure switch failed closed - Refer to troubleshooting. See Page 46.

Low pressure switch open during trial for ignition or run mode. Refer to troubleshooting. See Page 46.

Combustion air inducer calibration failure Unable to perform pressure switch calibration.

Ignition on High Fire - Information Only Code is displayed if 1) low pressure switch fails to

Low flame current - Run mode - Refer to troubleshooting. See Page 46. Check micro-amperes of flame sensor using control

Flame sensed out of sequence - Flame still present. Shut off gas. Check for gas valve leak. Replace, if

Limit switch circuit open - Refer to troubleshooting. See Page 46 Check for proper firing rate on furnace. Ensure

Discharge air temperature too high (gas heat only). Check temperature rise, air flow and input rate.

Soft lockout - Exceeded maximum number of retries. No flame current sensed.

Check operation of low pressure switch to see if it is stuck closed on heat call longer than 150 seconds. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct opera tion and restriction. Resumes normal operation after fault is cleared.

Check pressure (inches w.c.) of high pressure switch closing on heat call. Measure operating pres sure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. Re sumes normal operation after fault is cleared.

Check operation of high pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal opera tion after fault is cleared.

Check pressure (inches w.c.) of low pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air in ducer for correct operation and restriction. Re sumes normal operation after fault is cleared.

Check vent system and pressure switch wiring con nections. Resumes normal operation after fault is cleared.

close, then furnace will switch to high speed inducer to close both low and high pressure switches, then furnace lights on high fire, or 2) if continuous fan is active, furnace lights on high fire for 60 seconds to improve heat exchanger warm up time.

diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Alert clears after current heat call has been completed.

necessary. Alert clears when fault is recovered.

there is no blockage in heater. Check for proper air flow. If limit not closed within 3 minutes, unit will go into 1-hour soft lockout. Resumes normal operation after fault is cleared.

Cleared when heat call is finished.

Check for proper gas flow. Ensure that ignitor is lighting burner. Check flame sensor current. Clears when heat call finishes successfully.

Page 11

TABLE 5 Continued

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

E 271

Soft lockout - Exceeded maximum number of retries. Last retry failed due to the pressure switch opening.

E 272

Soft lockout - Exceeded maximum number of recycles. Last recycle due to the pressure switch opening.

E 273

Soft lockout - Exceeded maximum number of recycles. Last recycle due to flame failure.

E 274

Soft lockout - Exceeded maximum number of recycles. Last recycle failed due to the limit circuit opening or limit remained open longer than 3 minutes.

E 275

Soft lockout - Flame sensed out of sequence. Flame signal is gone. Shut off gas. Check for gas valve leak. 1-hour soft

E 276

Watchguard calibration failure. Unable to perform pressure switch calibration.

E 290

Ignitor circuit fault - Failed ignitor or triggering circuitry. Measure resistance of hot surface ignitor. Replace if

E 291

Heat air flow restricted below the minimum. Check for dirty filter and air flow restriction. Check

E 292

Indoor blower motor unable to start due to obstructed wheel, seized bearings.

E 294

Combustion air inducer over current. Check combustion blower bearings, wiring and

E 295

Indoor blower motor temperature is too high. Indoor blower motor over temperature (motor

E 310

Discharge error temperature sensor failure. Only shown if shorted or out of range.

E 311

Heat rate reduced to match indoor blower air flow. Warning Only. Furnace blower in cutback mode due

Check operation of low pressure switch to see if it is stuck closed on heat call. Check pressure (inches w.c.) of high pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct opera tion and restriction. Clears when heat call finishes successfully.

Check micro-amperes of flame sensor using control diagnostics or field-installed mode. Clean or replace sensor. Measure voltage of neutral to ground to ensure good unit ground. Clears when heat call finishes successfully.

Shut down system. 1-hour soft lockout. Check firing rate and air flow. Check for blockage. Clears when heat call finishes successfully.

lockout. Clears when flame has been proven stable.

Check vent system and pressure switch wiring con nections. 1-hour soft lockout. Clears when calibra tion has finished successfully.

open or not within specifications. 1-hour soft lock out. Clears when flame has been proven stable.

blower performance. 1-hour soft lockout. Cleared when heat call finishes successfully.

Indoor blower motor unable to start (seized bear ing, stuck wheel, etc.). Replace motor or wheel if assembly does not operate or meet performance standards. 1-hour soft lockout. Clears after circula tor successfully starts.

amps. Replace if does not operate or does not meet performance standards. Clears after inducer current is sensed to be in-range after the ignition following the soft lockout or reset.

tripped on internal protector). Check motor bearings and amps. Replace if necessary. Cleared after blower demand is satisfied.

Compare outdoor sensor resistance to temperature/ resistance charts in installation instructions. Re place sensor if necessary. Cleared in Communicat ing mode: 30 seconds after fault recovered. In NonCommunicating mode: Cleared after the current heat call is completed.

to restricted airflow. Reduce firing rate every 60 seconds to match available CFM. Check filter and duct system. To clear, replace filter if needed or re pair/add duct. 2-stage controls will reduce firing rate

stage. Clears when heat call finishes success

to 1 fully.

Page 12

TABLE 5 Continued

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

E 312

E 313

E 331 E 334 E 347

E 348

E 349

E 370

E 400

E 401

E 402

E 403

E 404

E 405

Restricted air flow in cooling or continuous fan mode is lower than cfm setting.

Indoor or outdoor unit capacity mismatch. Communication only. Incorrect indoor/outdoor capacity code selected.

Global network connection - Communication link problem. For Future Use.

Relay “Y1” stuck on interated control. Replace integrated control.

No 24 Volt output on Y1 of ”integrated control” with non communicating outdoor unit.

No 24 Volt output on Y2 of ”integrated control” with non?communicating outdoor unit.

No 24 Volts between R & O on ”integrated control” with non communi cating outdoor unit (Dual fuel module required for heat pump applica tion).

Interlock switch sensed open for 2 minutes. Control sees the loss of 24VAC for 2 minutes .Ter

LSOM - Compressor internal overload tripped. Thermostat demand Y1 is present; but, compres

LSOM Compressor long run cycle or low system pressure. Compressor ran more than 18 hours to satisfy a

LSOM - Outdoor unit system pressure trip. Discharge or suction pressure out-of-limits, or

LSOM - Compressor short-cycling. .(Running less than 4 minutes). Outdoor unit pressure trip

LSOM - Compressor rotor locked. Compressor short-cycling. (Running less than 4 minutes).

LSOM - Compressor open circuit. Compressor circuit open (due to power disconnec

Warning Only. Restricted airflow - Indoor blower is running at a reduced CFM (Cutback Mode - The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters (0 to 0.8” W.C.. total external static pressure). Check filter and duct system. To clear, replace filter if needed or repair/add duct. Cleared after the current service demand is satisfied.

Check for proper configuring in installation instruc tions. Alarm is just a warning. The system will op erate, but might not meet efficiency and capacity parameters. Alarm will clear when commissioning is exited. Cleared after commissioning is com plete.

Operation stopped. Y1 relay / Stage 1 failed. (Pilot relay contacts did not close or the relay coil did not energize; no input back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed.

Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil did not energize; no in put back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed.

Configuration link R to O needs to be restored. Replace link or hard-wire. Applicable in non com municating mode. Critical Alert.

minate all services and wait for interlock switch to close. The alarm will clear when 24VAC is continu ously sensed on DS terminal for a minimum of 10 seconds or on a power reset.

sor is not running. Check power to outdoor unit. Clears the error after current is sensed in both RUN and START sensors for at least 2 seconds, or after service is removed, or after power reset.

single thermostat demand. Critical Alert. Clears the error after 30 consecutive normal run cycles or power reset. Also monitors low pressure switch trips.

compressor overloaded. Clears the error after 4 consecutive normal compressor run cycles.

Compressor runs less than 3 minutes to satisfy a thermostat demand. Clears the error after 4 con secutive normal run cycles or power reset.

Compressor rotor locked up due to run capacitor short, bearings are seized, excessive liquid refrig erant, etc. Clears the error after 4 consecutive nor mal run cycles or after power reset.

tion, open fuse, etc.) Clears the error after 1 nor mal compressor run cycle.

Page 13

TABLE 5 Continued

Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover

E 406

E 407

E 408

E 409

LSOM - Compressor open start circuit. Required amount of current is not passing through

Start current transformer. Clears the error after cur rent is sensed in START sensor, or after power re set.

LSOM - Compressor open run circuit. Required amount of 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.

LSOM - Compressor contactor is welded. Compressor runs continuously. Clears the error

after 1 normal compressor run cycle or after power reset.

LSOM - Compressor low voltage. Secondary voltage is below 18VAC. After 10 min

utes, operation is discontinued. Clears the code after voltage is higher than 20 VAC for 2 seconds or after power reset.

DIP Switch Settings

NOTE - All icomfortt settings are set at the icomfort Wi-Fi thermostat. See icomfortt installation instruction. In icom fortt communication system all DIP switch and clippable link settings are ignored. For conventional thermostats pro ceed with DIP switch and clippable link settings as outlined in the following.

Heating Operation DIP Switch Settings Switch 1 -- Thermostat Selection -- This unit may be

used with either a single-stage or two-stage thermostat. The thermostat selection is made using a DIP switch which must be properly positioned for the particular application. The DIP switch is factory-positioned for use with a twostage thermostat. If a single-stage thermostat is to be used, the DIP switch must be repositioned.

a - Select “OFF” for two-stage heating operation con

trolled by a two-stage heating thermostat (factory set ting);

b - Select “ON” for two-stage heating operation con

trolled by a single-stage heating thermostat. This set ting provides a timed delay before second-stage heat is initiated.

Switch 2 -- Second Stage Delay (Used with SingleStage Thermostat Only) -- This switch is used to deter

mine the second stage on delay when a single-stage ther mostat is being used. The switch is factory-set in the OFF position, which provides a 7-minute delay before secondstage heat is initiated. If the switch is toggled to the ON position, it will provide a 12-minute delay before secondstage heat is initiated. This switch is only activated when the thermostat selector jumper is positioned for SINGLEstage thermostat use.

Switches 3 and 4 -- Blower-Off Delay -- The blower-on delay of 30 seconds is not adjustable. The blower-off delay (time that the blower operates 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 blower

off delay affects comfort and is adjustable to satisfy individ

ual applications. Adjust the blower off delay to achieve a supply air temperature between 90° and 110°F at the exact moment that the blower is de-energized. Longer off delay settings provide lower supply air temperatures; shorter set tings provide higher supply air temperatures.Table 6 pro vides the blower off timings that will result from different switch settings.

TABLE 6

Blower Off Delay Switch Settings

Blower Off Delay

(Seconds)

Switch 3 Switch 4

60 On Off

90 (Factory) Off Off

120 Off On 180 On On

Indoor Blower Operation DIP Switch Settings Switches 5 and 6 -- Cooling Mode Blower Speed -- The

unit is shipped from the factory with the dip switches posi tioned for high speed (4) indoor blower motor operation during the cooling mode. Table 7 provides the cooling mode blower speeds that will result from different switch settings. Switches 5 and 6 set the blower cfm for secondstage cool. The integrated control automatically ramps down to 70% of the second-stage cfm for first-stage cfm. Refer to blower tables for corresponding cfm values.

TABLE 7

Cooling Mode Blower Speeds

Speed

Switch 5 Switch 6

Low On On

Medium Low Off On

Medium High On Off

High (Factory) Off Off

Switches 7 and 8 -- Cooling Blower Speed Adjustment

-- The unit is shipped from the factory with the dip switches

positioned for NORMAL (no) adjustment. The dip switches may be positioned to adjust the blower speed by +10% or

Page 14

-10% to better suit the application. Table 8 below provides blower speed adjustments that will result from different switch settings. Refer to blower tables for corresponding cfm values.

TABLE 8

Cooling Blower Speed Adjustment

Adjustment

Switch 7 Switch 8

+10% (approx.) On Off Factory Default Off Off

-10% (approx.) Off On

Switches 9 and 10 -- Cooling Mode Blower Speed Ramping -- Blower speed ramping may be used to en

hance dehumidification performance. The switches are factory set at option A which has the greatest effect on dehumidification performance. Table 9 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.

NOTE - The off portion of the selected ramp profile also ap plies during heat pump operation in dual fuel applications.

TABLE 9

Cooling Mode Blower Speed Ramping

Ramping Option

Switch 9 Switch 10

A (Factory) Off Off

B Off On C On Off D On On

Ramping Option A (Factory Selection)

 Motor runs at 50% for 30 seconds.  Motor then runs at 82% for approximately 7-1/2 minu

tes.

 If demand has not been satisfied after 7-1/2 minutes,

motor runs at 100% until demand is satisfied.

 Once demand is met, motor runs at 50% for 30 sec

onds then ramps down to stop.

OFF

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COMPRESSOR DEMAND

100% CFM

1/2 MIN 50% CFM

OFF

Ramping Option B

 Motor runs at 82% for approximately 7-1/2 minutes. If

demand has not been satisfied after 7-1/2 minutes, motor runs at 100% until demand is satisfied.

 Once demand is met, motor ramps down to stop.

OFF

7 1/2 MIN

82%CFM

COMPRESSOR DEMAND

100% CFM

OFF

Ramping Option C

 Motor runs at 100% until demand is satisfied.

 Once demand is met, motor runs at 100% for 45 sec

onds then ramps down to stop.

OFF

100% CFM

COMPRESSOR

DEMAND

100% CFM

45 SEC.

OFF

Ramping Option D

 Motor runs at 100% until demand is satisfied.

 Once demand is met, motor ramps down to stop.

100% CFM

COMPRESSOR

DEMAND

OFFOFF

Switches 11, 12 and 13 -- Heating Mode Blower Speed --

The switches are factory set to the OFF position which pro vides factory default heat speed. Refer to table 10 for switches 11, 12 and 13 that provided the corresponding in creases or decrease to both high and low heat demand.

TABLE 10

Heating Mode Blower Speeds

Heat Speed

Switch

Switch12Switch

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

Decrease18% Off On On

Switches 14 and 15 -- Continuous Blower Speed --

Table 11 provides continuous blower speed adjustments that will result from different switch settings.

TABLE 11

Continuous Blower Speed

Continuous

Blower Speed

Switch 14 Switch 15

28% of High Cool Speed Off On

38% of High Cool Speed

(Factory)

Off Off

70% of High Cool Speed On Off

100% of High Cool Speed On On

Page 15

BLOWER DATA

SL280DF070V36A BLOWER PERFORMANCE (less lter) 0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

Heating Speed

DIP Switch

Settings

+24% 1065 1170

+18% 1010 1115

+12% 960 1055

+6% 910 1000

Factory Default 860 945

–6% 805 885

–12% 755 830

–18% 705 775

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 745 870 1025 1075 1100 1240 1425 1515

Factory Default 665 780 925 985 1015 1115 1305 1380

– 590 690 815 865 900 1025 1170 1250

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specic DIP Switch

Settings.

Factory default setting.

NOTES - The effect of static pressure is included in air volumes shown.

First stage HEAT is approximately 91% of the same second stage HEAT.

First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm.

First Stage Heating Speed - cfm Second Stage Heating Speed - cfm

COOLING

First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm

High Low Medium-Low Medium-High2 High

SL280DF070V36A BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Motor Watts @ Various External Static Pressures - in. wg.

First Stage Second Stage

+ Setting

Low 46 63 83 96 115 128 144 170 181 138 162 177 212 229 247 270 288 320 342 363

Cooling

Speed

Med-low 66 81 104 127 144 160 175 195 219 185 210 238 266 293 317 349 374 399 432 448

Med-High 100 123 138 167 191 211 234 255 271 299 328 354 380 412 434 477 499 528 557 570

High 124 146 170 192 214 226 255 273 307 376 378 414 458 493 507 558 571 604 613 585

Factory Default

Low 38 57 64 85 98 107 133 147 158 104 125 144 166

Cooling

Speed

Med-low 49 72 87 96 122 135 160 176 197 141 167 184 216 237 256 288 304 326 356 383

Med-High 70 90 109 132 158 172 201 222 231 218 245 276 306 323 357 374 403 444 472 489

High 90 108 138 154 170 192 223 235 260 259 280 317 350 381 405 449 469 496 532 544

– Setting

Low 33 45 60 73 89 104 114 123 144 73 89 111 124 155 175 196 210 224 243 263

Cooling

Speed

Med-low 40 54 74 86 106 115 134 142 170 108 118 153 170 196 219 227 253 266 286 316

Med-High 52 74 85 107 128 149 161 181 201 156 181 208 222 253 284 305 333

High 64 82 98 129 139 157 183 197 214 176 198 228 267 283 317 355 382 396 425 450

192 212 230 261 267 295 315

356 374 398

Page 16

+ 35 hidden pages

Lennox SL280UH090V36B, SL280DF070V36A, SL280UH070V36A, SL280UH090V48B, SL280UH090V60C Unit Information

Specifications and Main Features

Frequently Asked Questions

User Manual

PARTS IDENTIFICATION