Lennox EL296DF045XV36B, EL296DF110XV60C, EL296DF070XV48B, EL296DF090XV60C Unit Information

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Service Literature

Corp. 1126-L5

Revised 01/2018

EL296DFV(X)

icomfort

EL296DFV(X) series units are 90% efficiency gas furnaces used for upflow or horizontal applications only, manufac tured with Lennox Duralok heat exchangers formed of aluminized steel. EL296DFV(X) units are available in heat ing capacities of 44,000 to 110,000 Btuh and cooling ap plications 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. EL296DFV(X) model units are equipped with the icomfort

eLight EL296DFV(X) unit meets the California Nitrogen Oxides (NO quirements. All units use a redundant gas valve to assure safety shut-off as required by C.S.A.

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.

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

I Unit Components Page 5........................

II Installation Page 31.............................

III Start Up Page 55..............................

IV Heating System Service Checks Page 56.........

V Typical Operating Characteristics Page 59.........

VI Maintenance Page 59..........................

VII Wiring and Sequence of Operation Page 62......

VIII Field Wiring and Jumper Settings Page 67.......

IX Program Unit Capacity Size Mode Page 71.......

X Troubleshooting Page 72........................

two-stage variable speed integrated control.

) Standards and California Seasonal Efficiency re

TABLE OF CONTENTS

- ENABLED EL296DFV(X) SERIES UNITS

enabled Sur

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.

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.

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SPECIFICATIONS

Gas Heating Performance

High Fire

Temperature rise range - °F 35-65 35-65 40-70 45-75

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

Low Fire

Temperature rise range - °F 20 - 50 25 - 55 30 - 60 35 - 65

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

High static in. w.g.

Connections in.

Intake / Exhaust Pipe (PVC) 2 / 2 2 / 2 2 / 2 2 / 2

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

Condensate Drain Trap (PVC pipe) - i.d. 1/2 1/2 1/2 1/2

with furnished 90° street elbow 1/2 slip x 1/2 Mipt 1/2 slip x 1/2 Mipt 1/2 slip x 1/2 Mipt 1/2 slip x 1/2 Mipt

with eld supplied (PVC coupling) - o.d. 1/2 slip x 1/2 NPT 1/2 slip x 1/2 NPT 1/2 slip x 1/2 NPT 1/2 slip x 1/2 NPT

Indoor

Wheel nom. diameter x width - in. 10 x 9 11 x 10 11 x 11 11 x 11

Blower

Tons of add-on cooling 2 - 3 2.5 - 4 3 - 5 3 - 5

Air Volume Range - cfm 545 - 1360 575 - 1800 890 - 2130 860 - 2180

Electrical

Data

Blower motor full load amps 7.7

Maximum overcurrent protection 15 20 20 20

Shipping Data lbs. - 1 package 131 136 164 176

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

Model No. EL296DF045XV36B EL296DF070XV48B EL296DF090XV60C EL296DF110XV60C

AFUE 96% 96% 96% 96%

Input - Btuh 44,000 66,000 88,000 110,000

Output - Btuh 43,000 64,000 85,000 106,000

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

Input - Btuh 29,000 43,000 57,000 72,000

Output - Btuh 28,000 42,000 56,000 70,000

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

Heating 0.8 0.8 0.8 0.8

Cooling 1.0 1.0 1.0 1.0

Motor output - hp 1/2 3/4 1 1

Voltage 120 volts - 60 hertz - 1 phase

10.1 12.8 12.8

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

furnaces.

INSTALLATION CLEARANCES

Sides

Rear 0 inches (0 mm)

Top/Plenum 1 inch (25 mm)

Front 0 inches (0 mm)

Front (service/alcove) 24 inches (610 mm)

Floor

NOTE - Air for combustion must conform to the methods outlined in the National Fuel Gas Code (NFPA 54/ANSI-

NOTE - In the U.S. ue sizing must conform to the methods outlined in the current National Fuel Gas Code (NFPA

Z223.1) or the National Standard of Canada CAN/CSA-B149.1 “Natural Gas and Propane Installation

54/ANSI-Z223.1) or applicable provisions of local building codes. In Canada ue sizing must conform to

Clearance for installation on combustible oor if Optional Downow Combustible Flooring Base is installed be-

tween furnace and combustible oor. Not required in add-on cooling applications if installed in accordance with

local codes or National Fuel Gas Code ANSI-Z223.1 or CAN/CGA-149.1,.2. Do not install the furnace directly on

the methods outlined in National Standard of Canada CAN/CSA-B149.1.

Allow proper clearances to accommodate condensate trap and vent pipe installation.

carpeting, tile, or other combustible materials other than wood ooring.

Code”.

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0 inches (0 mm)

Combustible

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OPTIONAL ACCESSORIES - ORDER SEPARATELY

NOTE - FURNACES CANNOT BE TWINNED!

“B” Width Models “C” Width Models

CABINET ACCESSORIES

Downow Combustible Flooring Base 11M60 11M61

CONDENSATE DRAIN KITS

Condensate Drain Heat Cable 6 ft. 26K68 26K68

24 ft. 26K69 26K69

50 ft. 26K70 26K70

Heat Cable Tape Fiberglass - 1/2 in. x 66 ft. 36G53 36G53

Aluminum foil - 2 in. x 60 ft. 16P89 16P89

Crawl Space Vent Drain Kit US 51W18 51W18

Canada 51W19 51W19

CONTROLS

icomfort Touch® Communicating Thermostat 49W95 49W95

Remote Outdoor Temperature Sensor

(for dual fuel and Humiditrol®)

Discharge Temperature Sensor 88K38 88K38

ComfortSense

Remote Outdoor Temperature Sensor

7000 Thermostat Y2081 Y2081

(for dual fuel and Humiditrol)

FILTERS

Downow Filter Cabinet 51W07 51W08

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

NIGHT SERVICE KITS

Night Service Kit 14C99 14C99

Universal Service Kit - Switches 89W20 89W20

TERMINATION KITS

See Installation Instructions for specic venting information.

Termination Kits Direct Vent Applications Only

Concentric US - 2 in. 71M80 69M29

3 in. - - - 60L46

Canada - 2 in. 44W92 44W92

3 in. - - - 44W93

Flush-Mount US - 2, 2-1/2 or 3 in. 51W11 51W11

Canada - 2, 2-1/2 or 3 in. 51W12 51W12

Wall - Close

Couple

Wall - Close

Couple WTK

Termination Kits Direct or Non-Direct vent

Roof Termination Flashing Kit - Direct or Non-Direct Vent

Wall Ring Kit 2 in. 15F74

Roof 2 in. 15F75 15F75

US - 2 in. 22G44 - - -

3 in. 44J40 44J40

Canada - 2 in. 30G28 - - -

3 in. 81J20 81J20

2 in. 44J41 44J41

(2 ashings)

VENTING

Left Side Vent Kit 2 or 3 in. 87W73 87W73

Remote Outdoor Sensor may be used with an icomfort®-enabled outdoor unit for a secondary (alternate) sensor reading. Sensor may also be used with a conventional

Remote Outdoor Temperature Sensor for ComfortSense 7000 Thermostat must be connected directly to the thermostat, Do not connect it directly to the icomfort® control.

Kits contain enough parts for two, non-direct vent installations.

NOTE - The curved exhaust pipe furnished with the Left Side Vent Kit counts as one additional 2 in. diameter 90° elbow. When using 3 in. diameter pipe, the furnished

curved exhaust pipe and eld provided ttings to transition from 2 in. to 3 in. count as 20 feet of equivalent pipe on all units.

NOTE - Termination Kits 44W92, 44W93, 30G28, 51W12, 51W19, 81J20 are certied to ULC S636 standard for use in Canada only.

Optional for service diagnostics.

Cleanable polyurethane, frame-type lter.

outdoor unit.

Non-direct vent only.

X2658 X2658

15F74

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CONTROL BOX

(Includes integrated control,

transformer and door switch)

EL296DFV PARTS IDENTIFICATION

VARIABLE SPEED MOTOR

(hidden)

BAG ASSEMBLY (shipping location)

COMBUSTION AIR INDUCER

OUTER

ACCESS

PANEL

COMBUSTION AIR INDUCER

PRESSURE SWITCH

BURNER BOX ASSEMBLY

(includes sensor, rollout switches and ignitor)

GAS VALVE

FIGURE 1

COLD END HEADER BOX

PRIMARY LIMIT

BLOWER DECK

DuralokPlus

HEAT EXCHANGER

ASSEMBLY

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I-UNIT COMPONENTS

EL296DFV(X) unit components are shown in figure 1. The gas valve, combustion air inducer and burners can be ac cessed by removing the access panel. Electrical compo nents are in the control box (figure 2) found in the blower section.

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)

A door interlock switch rated 14A at 125VAC is wired in se ries with line voltage. When the inner blower access panel is removed the unit will shut down.

CONTROL BOX EL296DFV

Transformer

Circuit Breaker

Interlock Switch

SureLight

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.

Integrated Control

FIGURE 2

CIRCUIT BREAKER CB8

PRESS TO RESET

FIGURE 3

WARNING

Shock hazard. Disconnect power before servicing. Integrated

control is not field repairable. If control is inoper able, simply replace entire control.

Can cause injury or death. Unsafe operation will re sult if repair is attempted.

4. Integrated Control (A92)

Units are equipped with the icomfort two-stage, variable speed integrated control. This control is used with the icomfort Touch® thermostat as part of a communicating comfort system. The control can also oper ate with a non-communicating conventional single or twostage thermostat. The system consists of a ignition / blow er control (figures 4 and 5) with control pin designations 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 heat ing. The furnace combustion air inducer, gas valve and in door 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.

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, 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 remains ener gized during the trial until flame is sensed. If ignition is not

enabled SureLight

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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 seconds. After a total of five trials for ignition (in cluding the initial trial), the control goes into WatchguardFlame 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, 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. The unit will switch to second stage heat after a "recognition period". DIP switch 2, labeled SECOND STAGE DELAY, is factory set in the OFF position for a 7 minute recognition period. The switch can be moved to the ON position for a 12 minute recognition period, after which time the unit will switch to secondstage heat. While in the two-stage thermostat mode, the burners will fire on firststage 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 opera tion. See Sequence of Operation flow charts in the back of this manual for more detail.

TABLE 1

SureLight

PIN # Function

Control 5 Pin Terminal Designation

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 Second Stage

2 Second Stage Prove Switch

3 Rollout Switch In

4 Ground

5 24V Hot

6 Primary Limit In

7 Gas Valve First Stage

8 Gas Valve Common

9 24V Neutral

10 Ground

11 Rollout Switch Out

12 First Stage Prove Switch

TABLE 3

Control 6 Pin Terminal Designation

SureLight

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

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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

icomfort

COMMUNICATING

OUTDOOR

EQUIPMENT

TB84

icomfort

COMMUNICATING

INDOOR

THERMOSTAT

I + I -CRI + I -

TB83 icomfort Communicating Outdoor Equipment

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

TB84 icomfort Communicating Indoor Thermostat

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

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

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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%

121415

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

FLAME

SENSE

123456

S4S3

911

OUTDOOR

SENSOR

DISCHARGE

AIR SENSOR

I+ I−

OUTDOOR EQUIPMENT

DIAGNOSTIC

PUSH BUTTON

RI+ I− CRI+ I− C

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 DH L 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

CAI2

110

4 7

SELECTION

NO HARMONY ZONING

NO SIGNATURESTAT

W/ DS CONNECTION

DO NOT CUT

W914

DEHUM

HARMONY

HARMONY ZONING

SIGNATURESTAT W/

DS CONNECTION

CUT LINK

W914

DEHUM

HARMONY

DEHUMIDIFICATION−

HARMONY LINK

(JUMPERS R to DS)

CAI1

CUT FOR

OPTION

W915

2 STAGE

COMPR

W951 HEAT

PUMP

W914 DEHUM

HARMONY

W914

P79

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

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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 “F” Enter flame signal mode

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

__ Two horizontal bars __

Soft disable

* 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 10 lists diagnostic LED codes.

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, the Flame Signal “F” mode and “P” the Program Unit Capacity/Size 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 se lected. Once all items in the menu have been displayed, the menu resumes from the beginning until the button is re

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.

leased.

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.

Flame Signal Mode

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

Soft Disable

Soft disabling is when thermostat finds a device on the BUS that it does not recognize and the thermostat sends a the device a message to be in soft disabling mode until proper ly configured. Two horizontal bars will display.

Steps to follow if the damper control module is displaying the soft disable code.

1- Confirm proper wiring between all devices (thermo stat, damper control module, indoor and outdoor).

2- Cycle power to the control that is displaying the soft disable code.

Flame signal mode is exited after any of the following:

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

lines “≡” are displayed

 10 minutes after entering the flame sense mode.

3- Put the room thermostat through set up.

4- Go to setup / system devices / thermostat / edit / then push reset.

5- Go to setup / system devices / thermostat / edit / then push resetAll.

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TABLE 5

Integrated Diagnostic Codes/Status of Equipment

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).

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

E 105

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

E 110

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

E 111

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

E 112

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

E 113

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

E 114

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

E 115

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

E 116

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

E 117

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

E 120

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.

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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 71.

E 203

Appliance capacity / size is NOT programmed. Invalid unit codes refer to configuration flow chart. See Page 71.

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 11

Page 12

TABLE 5 Continued

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

E 206

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.

E 207

Hot surface ignitor sensed open - Refer to troubleshooting. See Page 72. Measure resistance of hot surface ignitor. Replace if

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

E 223

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

E 224

Low pressure switch failed closed - Refer to troubleshooting. See Page 72.

E 225

High pressure switch failed open - Refer to troubleshooting. See Page 72.

E 226

High pressure switch failed closed - Refer to troubleshooting. See Page 72.

E 227

Low pressure switch open during trial for ignition or run mode. Refer to troubleshooting. See Page 72.

E 228

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

E 229

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

E 240

Low flame current - Run mode - Refer to troubleshooting. See Page 72. Check micro-amperes of flame sensor using control

E 241

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

E 250

Limit switch circuit open - Refer to troubleshooting. See Page 72 Check for proper firing rate on furnace. Ensure

E 252

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

E 270

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 12

Page 13

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 13

Page 14

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, compressor

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 com

LSOM - Compressor short-cycling. .(Running less than 4 minutes). Out door 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 oper ate, but might not meet efficiency and capacity pa rameters. Alarm will clear when commissioning is exited. Cleared after commissioning is complete.

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 input back to IFC chip). Critical Alert. Cleared after reset and Y1 input sensed.

Configuration link R to O needs to be restored. Re place link or hard-wire. Applicable in non communi cating 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.

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 ser vice 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.

pressor overloaded. Clears the error after 4 consec utive normal compressor run cycles.

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

Compressor rotor locked up due to run capacitor short, bearings are seized, excessive liquid refriger ant, etc. Clears the error after 4 consecutive normal run cycles or after power reset.

tion, open fuse, etc.) Clears the error after 1 normal compressor run cycle.

Page 14

Page 15

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.

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 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 15

Page 16

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

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 - In heat pump mode blower operation defaults to option c.

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

Switch11Switch12Switch

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 16

Page 17

BLOWER DATA

EL296DF045XV36B BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

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% 910 1150

+18% 855 1095

+12% 820 1040

+6% 770 990

Factory Default 745 935

–6% 700 880

–12% 665 820

–18% 635 755

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 640 755 850 975 895 1050 1210 1360

Factory Default 580 695 780 880 805 965 1105 1250

– 545 645 720 795 735 865 1000 1130

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 Set-

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

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.

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-High

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

Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 cfm.

tings.

Factory default setting.

High

EL296DF045XV36B BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

First Stage Second Stage

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.

+ Setting

Low 28 44 60 77 93 11 2 128 144 158 59 77 97 121 138 160 182 197 216 241 256

Cooling

Speed

Med-low 47 67 88 105 121 138 161 179 201 131 154 177 202 228 250 277 299 320 344 370

Med-High 69 91 11 3 132 160 183 204 220 246 199 215 248 275 308 340 360 390 407 431 445

High 100 11 7 153 172 192 215 240 260 286 292 313 363 379 419 452 488 5 11 526 523 524

Factory Default

Low 17 34 52 65 82 97 121 132 148 61 79 98 125

Cooling

Speed

Med-low 35 50 70 85 105 125 140 155 175 99 11 5 148 167 188 211 236 256 279 303 317

Med-High 54 72 95 113 131 148 173 189 210 147 170 197 223 252 278 301 330 355 373 398

High 74 96 11 8 141 168 190 212 233 252 216 229 258 303 325 356 390 410 426 448 465

– Setting

Low 17 31 49 61 75 91 107 123 136 46 64 82 101 115 134 155 174 196 205 221

Cooling

Speed

Med-low 28 45 61 77 93 11 2 129 144 159 72 92 114 133 160 184 204 221 247 263 282

Med-High 40 57 77 93 11 2 130 148 165 186 11 2 130 161 183 205 226 252 272

High 57 76 97 119 136 156 179 195 214 155 174 207 235 265 292 3 11 343 370 386 414

141 164 185 201 219 246 259

294 319 341

Page 17

Page 18

BLOWER DATA

EL296DF070XV48B BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

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% 1085 1635

+18% 1030 1525

+12% 950 1450

+6% 910 1365

Factory Default 850 1310

–6% 790 1225

–12% 740 1135

–18% 680 1060

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 740 915 1055 1255 1110 1340 1575 1800

Factory Default 660 820 940 1120 995 1230 1420 1650

– 575 735 850 995 880 1085 1290 1460

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 Set-

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

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 380 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-High

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

Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 cfm.

tings.

Factory default setting.

High

EL296DF070XV48B BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

First Stage Second Stage

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.

+ Setting

Low 68 88 109 132 154 178 199 213 238 144 169 208 244 270 310 343 378 401 432 457

Cooling

Speed

Med-low 93 120 147 172 198 220 254 274 304 257 276 326 370 398 437 470 492 531 558 598

Med-High 120 152 180 220 254 281 318 344 380 390 428 472 526 574 611 659 706 745 788 820

High 214 237 284 324 352 390 424 456 474 627 604 663 721 775 825 869 908 915 881 864

Factory Default

Low 35 54 74 92 109 129 147 163 191 104 137 162 189

Cooling

Speed

Med-low 75 100 115 140 165 190 210 230 255 188 203 250 297 327 374 399 432 454 486 513

Med-High 99 129 159 179 209 236 270 293 329 304 340 376 418 450 495 533 567 613 637 674

High 157 184 232 264 285 335 365 406 419 454 469 537 589 634 669 724 770 818 833 840

– Setting

Low 27 49 63 73 98 11 6 135 155 168 86 111 135 162 186 206 236 257 283 306 339

Cooling

Speed

Med-low 67 87 109 132 154 177 199 212 238 129 156 187 226 258 288 325 353 385 409 441

Med-High 82 105 127 153 176 196 223 243 269 226 244 290 335 364 402 435 465

High 107 141 164 195 224 263 282 321 347 329 375 403 444 481 526 570 612 656 680 718

219 254 278 312 341 369 400

485 516 556

Page 18

Page 19

BLOWER DATA

EL296DF090XV60C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

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% 1425 1895

+18% 1355 1825

+12% 1280 1740

+6% 1215 1660

Factory Default 1160 1575

–6% 1055 1455

–12% 1010 1365

–18% 950 1265

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 1115 1265 1400 1600 1600 1750 1970 2130

Factory Default 1005 1150 1275 1450 1450 1630 1810 1975

– 890 1065 1150 1270 1270 1450 1645 1810

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 Set-

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

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 450 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-High

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

Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm.

tings.

Factory default setting.

High

EL296DF090XV60C BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

First Stage Second Stage

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.

+ Setting

Low 79 108 144 162 207 242 262 293 323 275 299 366 399 449 483 532 584 605 644 680

Cooling

Speed

Med-low 120 156 187 233 261 279 329 368 401 387 409 471 521 562 606 650 688 716 762 800

Med-High 155 202 235 293 317 369 407 453 502 547 577 622 667 744 795 835 872 910 950 963

High 268 299 366 399 449 483 532 584 605 780 775 8 11 898 942 994 1048 1071 1082 1080 1073

Factory Default

Low 56 86 111 140 170 200 232 259 282 186 219 270 308

Cooling

Speed

Med-low 93 11 8 152 195 223 254 283 306 344 278 304 365 420 450 510 544 592 640 665 698

Med-High 123 161 201 228 260 310 341 381 416 446 475 528 582 616 662 686 747 780 823 855

High 182 219 270 308 361 390 431 489 517 576 603 654 704 756 809 871 902 939 972 975

– Setting

Low 48 69 101 120 152 175 201 218 249 11 8 155 181 232 259 299 340 376 402 438 476

Cooling

Speed

Med-low 65 94 123 150 185 220 250 278 296 177 205 267 304 353 390 430 486 515 563 587

Med-High 93 118 152 195 223 254 283 306 344 301 322 392 439 468 531 568 599

High 116 155 181 232 259 299 340 376 402 446 475 528 582 616 662 686 747 780 823 855

361 390 431 489 517 555 590

647 678 721

Page 19

Page 20

BLOWER DATA

EL296DF110XV60C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

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% 1535 2015

+18% 1445 1935

+12% 1370 1855

+6% 1300 1760

Factory Default 1220 1645

–6% 1135 1545

–12% 1070 1420

–18% 1000 1335

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 1095 1265 1395 1585 1585 1790 1990 2180

Factory Default 965 1130 1285 1440 1440 1630 1845 2005

– 860 1035 1130 1275 1275 1475 1655 1845

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 Set-

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

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 450 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-High

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

Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 cfm.

tings.

Factory default setting.

High

EL296DF110XV60C BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

First Stage Second Stage

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.

+ Setting

Low 71 99 147 166 202 240 271 302 337 248 280 333 374 429 469 511 548 594 619 677

Cooling

Speed

Med-low 127 159 198 225 256 301 325 365 390 409 427 496 531 587 632 665 721 742 781 805

Med-High 162 204 242 287 316 371 408 446 487 563 589 651 703 755 808 860 888 932 970 1007

High 243 280 333 374 429 469 511 548 594 866 850 915 963 1020 1056 1091 1127 1141 1136 1131

Factory Default

Low 57 88 117 140 165 196 232 259 283 167 214 244 291

Cooling

Speed

Med-low 77 11 2 147 172 209 250 283 317 345 275 321 348 418 447 505 546 597 632 668 716

Med-High 122 154 199 230 268 300 331 373 411 461 493 547 572 628 666 703 745 777 819 860

High 167 214 244 291 331 380 405 467 497 601 626 688 730 787 823 880 924 963 994 1011

– Setting

Low 44 67 99 11 5 144 167 197 215 245 126 165 201 232 262 305 334 373 417 451 479

Cooling

Speed

Med-low 66 97 123 153 186 216 247 275 303 187 219 272 308 360 391 432 479 514 559 588

Med-High 77 112 147 172 209 250 283 317 345 308 341 390 430 490 528 569 617

High 127 165 201 232 262 305 334 373 417 461 493 547 572 628 666 703 745 777 819 860

331 380 405 467 497 539 583

640 691 724

Page 20

Page 21

On-Board Links

Note: In icomfortt systems with a conventional outdoor unit (non-communicating), the on-board clippable links must be set to properly configure the system.

damage. Refer to table 12 for operation sequence in ap plications including EL296DFV, a thermostat which fea tures humidity control and a single-speed outdoor unit. Table 13 gives the operation sequence in applications with a two-speed outdoor unit.

On-Board Link W951 Heat Pump (R to O)

WARNING

Carefully review all configuration information pro vided. Failure to properly set DIP switches, jumpers and on-board links can result in improper operation!

On-board link W951 is a clippable connection between ter minals R and O on the integrated control. W951 must be cut when the furnace is installed in applications which include a heat pump unit and a thermostat which features dual fuel use. If the link is left intact, terminal “O” will remain ener

On-Board Link W914 Dehum or Harmony (R to DS)

On-board link W914, is a clippable connection between ter minals R and DS on the integrated control. W914 must be cut when the furnace is installed with either the Harmony III zone control or a thermostat which features humidity control. If the link is left intact the PMW signal from the Har mony III control will be blocked and also lead to control

gized eliminating the HEAT MODE in the heat pump.

On-Board Link W915 2 Stage Compr (Y1 to Y2)

On-board link W915 is a clippable connection between ter minals Y1 and Y2 on the integrated control. W915 must be cut if two-stage cooling will be used. If the Y1 to Y2 link is not cut the outdoor unit will operate in second-stage cool ing only.

TABLE 12

OPERATING SEQUENCE

EL296DFV, Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit

OPERATING SEQUENCE

System

Condition

NO CALL FOR DEHUMIDIFICATION

Normal Operation 1 On On On Acceptable

BASIC MODE (only active on a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable

Dehumidification

Call

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable

Dehumidification

call

Dehumidification

call ONLY

Step

Jumpers at indoor unit with a single stage outdoor unit With Condensing unit - Cut W914 (R to DS) on SureLight With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight

Thermostat Demand Relative Humidity

Y1 O G

2 On On On Demand 0 VAC High 70%*

2 On On On Demand

1 On On On Demand

SYSTEM DEMAND SYSTEM RESPONSE

Status D

VAC

Compressor

High 100%

High 70%*

control

Blower

(COOL)

control

CFM

Comments

Compressor and indoor blower follow thermostat demand

ComfortSense® 7000 thermostat energizes Y1 and de-energizes D on a call for de-humidification

Dehumidification mode begins when humidity is greater than set point

ComfortSense thermostat maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint**

7000

will try to

Use Dave Lennox ComfortSense® 7000 thermostat Y2081 4 heat / 2 cool for this application *Dehumidification blower speed is 70% of COOL speed for all units . **In Precision mode, ComfortSense

7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.

Page 21

Page 22

TABLE 13

OPERATING SEQUENCE

EL296DFV, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit

OPERATING

SEQUENCE

SYSTEM DEMAND SYSTEM RESPONSE

Thermostat Demand Relative Humidity

System

Condition

Ste

Y1 Y2 O G

W1W

Status D

NO CALL FOR DEHUMIDIFICATION

Normal Opera

tion - Y1

Normal Opera

tion - Y2

1 On On On Acceptable

2 On On On On Acceptable

VAC

ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING

BASIC MODE (only active on a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

Call

1 On On On Acceptable

2 On On On On Demand

VAC

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

call

Dehumidification

call ONLY

1 On On On Acceptable

2 On On On On Demand

1 On On On On Demand

VAC

ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING

BASIC MODE (only active on a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

Call

1 On On On On Acceptable

2 On On On On Demand

VAC

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

call

1 On On On Acceptable

2 On On On On Demand

VAC

Compressor

Low 70%*

High 100%

Low 70%*

High 70%**

Low 70%*

High 70%**

High 100%

High 70%**

Low 70%*

High 70%**

Blower

CFM

(COOL)

Comments

Compressor and indoor blower follow thermostat demand

ComfortSense

7000 thermostat energizes Y2 and de-energizes D on a call for de-humidification

Dehumidification mode begins when humidity is greater than set point

ComfortSense® 7000 thermostat will try to maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint***

ComfortSense® 7000 thermostat energizes Y2 and de-energizes D on a call for de-humidification

Dehumidification mode begins when humidity is greater than set point

Dehumidification

call ONLY

1 On On On On Demand

VAC

Jumpers at indoor unit with a two stage outdoor unit Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2) With Condensing unit - Cut W914 (R to DS) on SureLight

control

With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight

Use Dave Lennox ComfortSense® 7000 thermostat Y2081 4 heat / 2 cool for this application. *Normal operation first stage cooling blower speed is 70% COOL speed. **Dehumidification blower speed is, reduced to 70% of COOL. ***In Precision mode, ComfortSense

7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.

Page 22

High 70%**

control

ComfortSense® 7000 thermostat will try to maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint***

Page 23

B- Indoor Blower Motor

Power Choke

(4 and 5 Ton Only)

To Remove Blower From Unit: Remove access panels,

Control box, Bolts and Wiring Jackplugs.

Blower Motor

(B3)

Then Slide Out Front of Unit.

FIGURE 6

WARNING

During blower operation, the ECM motor emits ener gy that may interfere with pacemaker operation. In terference is reduced by both the sheet metal cabinet and distance.

The motor communicates with the integrated control via a 2-way serial connection. The motor receives all necessary functional parameters from the integrated control and does not rely on a factory program like traditional variable speed motors. EL296DFV units use a three‐phase, electronically controlled D.C. brushless motor (controller converts single phase a.c. to three phase D.C.), with a permanent‐magnet‐ type rotor (figure 7). Because this motor has a permanent magnet rotor it does not need brushes like conventional D.C. motors. The stator windings are split into three poles which are electri cally connected to the controller. This arrangement allows motor windings to turn on and off in sequence by the con troller.

IMPORTANT

Earlier ECM motors used on other Lennox furnace models are not interchangeable with motors used on the EL296 furnace line.

A solid‐state controller is permanently attached to the motor. The controller is primarily an A.C. to D.C. con verter. Converted D.C. power is used to drive the motor. The controller contains a microprocessor which moni tors varying conditions inside the motor (such as motor workload).

BLOWER MOTOR COMPONENTS

STATOR

(WINDINGS)

BEARING

ROTOR

FIGURE 7

The controller uses sensing devices to sense what position the rotor is in at any given time. By sensing the position of the rotor and then switching the motor windings on and off in se quence, the rotor shaft turns the blower.

All EL296DFV blower motors use single phase power. An external run capacitor is not used. The motor uses permanently lubricated ball‐type bearings.

Internal Operation

The motor is controlled via serial communication between the integrated control on the furnace and the controller at tached to the motor shell. The messages sent back and forth between the two controls serve to communicate rota tional direction, demand, motor size, current draw, torque, and rpm, among other variables.

Motor rpm is continually adjusted internally to maintain constant static pressure against the blower wheel. The control ler monitors the static work load on the motor and motor amp‐ draw to determine the amount of rpm adjustment. Blower rpm may be adjusted any amount in order to maintain a constant cfm as shown in Blower Ratings Tables. The cfm remains rel atively stable over a broad range of static pressure. Since the blower constantly adjusts rpm to maintain a specified cfm, mo tor rpm is not rated. Hence, the terms “cool speed”, “heat speed ” or “speed tap” in this manual, on the unit wiring dia gram and on blower B3, refer to blower cfm regardless of mo tor rpm.

Initial Power Up

When line voltage is applied to B3, there will be a large inrush of power lasting less than 1/4 second. This inrush charges a bank of DC filter capacitors inside the controller. If the discon nect switch is bounced when the disconnect is closed, the dis connect contacts may become welded. Try not to bounce the disconnect switch when applying power to the unit.

Page 23

Page 24

Motor Start‐Up

When B3 begins start‐up, the motor gently vibrates back and forth for a moment. This is normal. During this time the elec tronic controller is determining the exact position of the rotor. Once the motor begins turning, the controller slowly eases the motor up to speed (this 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 a re start. The shutdown feature provides protection in case of a frozen bearing or blocked blower wheel. The motor may at tempt to start eight times. If the motor does not start after the eighth try, the controller locks out. Reset controller by momen tarily turning off power to unit.

The DC filter capacitors inside the controller are connected electrically to the motor supply wires. The capacitors take approximately 5 minutes to discharge when the disconnect is opened. For this reason it is necessary to wait at least 5 minutes after turning off power to the unit before attempt ing to service motor.

DANGER

Disconnect power from unit and wait at least five minutes to allow capacitors to discharge before at tempting to service motor. Failure to wait may cause personal injury or death.

Power Choke (L13)

A choke coil is used on EL296DFV 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 and figures 8 and 9.

1- Remove J48 (5 pin power plug) from P48 on the mo

tor.

2- With the power on at the furnace and door switch de

pressed, use a test meter to verify 120V between pins

4 and 5 on J48.

3- Reconnect J48 to P48 on the motor.

4- Remove J49 (4 pin low voltage connector) from P49

on the motor.

5- Using test jumpers, apply 24V to pins 3 and 4 on P49

on the motor.

Note: Do not apply 24V to pins 2 and 4 on P49. Doing so will cause permanent damage to the motor.

6- Motor should run at 75%.

7- Test is complete. Remove jumpers and reconnect

plugs.

Another option is to use the TECMate PRO motor tester

with the 16 to 4 pin adaptor. The use of the TECMate PRO

isolates the motor from the integrated control. Follow the

instructions provided with the kit. If the motor runs do not

replace.

Page 24

Page 25

BLOWER B3 HARNESS CONNECTORS

P48 5 Pin

SHAFT

BLOWER B3 HARNESS CONNECTORS

P48 5 Pin

P49 4 Pin

SHAFT

MOTOR with INTEGRATED

CONTROLLER

J48 5 Pin

J49 4 Pin

J49 4 Pin Control Connector

J48 5 Pin Line Voltage Connector

FIGURE 8

P49 4 Pin

MOTOR with INTEGRATED

CONTROLLER

P48 5 Pin

P49 4 Pin

120v

J48 Connector

240v

Page 25

J48 Connector installed on motor

P49 4 Pin

24v Transformer

J49 Connector

FIGURE 9

Page 26

Troubleshooting Motor Windings

Ensure that motor windings are not damaged by perform ing the following tests:

NOTE - If your ohm meter is not an auto-ranging type, set it to the highest ohm scale (100k ohms or greater) before performing tests.

TABLE 14

Flame Signal in Microamps

Scale

200k

20k

200 two hundred ohm 0-200

Measurement Range

in words ohms

two megohm -- two million ohms

two hundred kilohm

-- two hundred thou sand ohms

twenty kilohm -twenty thousand ohms

two kilohm -- two thousand ohms

0-2,000,000

0-200,000

0-20,000

0-2,000

1 - The lead-to-lead resistance across any two leads

should be less than 20 ohms.

2 - Each lead-to-lead resistance should be the same.

If the measured resistance is greater than 20 ohms, re place the motor and control module.

Test B

FIGURE 12

C- Heating Components

1. Ignitor

The SureLight

ignitor is made of durable silicon nitride. Ig nitor longevity is enhanced by controlling voltage to the ig nitor. The integrated control provides a regulated 120 volts to the ignitor for a consistent ignition and long ignitor life. Ohm value should be 39 to 70. See figure 13 for ignitor location and figure 14 for ignitor check out.

FIGURE 10

TEST 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 module. If the resistance to ground is >100k, the motor windings are fine. Proceed to Test B.

Test A

FIGURE 11

TEST B

Use an ohmmeter to measure the motor phase-to-phase resistance by checking these combinations of the the 3-pin motor plug. For the purpose of this test, start at either end of the connector as lead 1.

NOTE - The EL296DFV(X) furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

2. Flame Sensor

A flame sensor is located on the left side of the burner sup port. See figure 13. The sensor tip protrudes into the flame envelope of the left-most burner. The sensor can be re moved for service without removing any part of the burn ers. During operation, flame is sensed by current passed through the flame and sensing electrode. The SureLight control allows the gas valve to remain open as long as flame signal is sensed. To check flame sense signal use the push-button found on the integrated control and go to Field Test Mode. The menu will display the flame signal. See table 15 for flame signal.

TABLE 15

Flame Signal in Microamps

Normal

Low Drop Out

2.6 or greater 2.5 or less 1.1

3. Gas Valve

The valve (figure 51) is internally redundant to assure safe ty shut-off. If the gas valve must be replaced, the same type valve must be used.

24VAC terminals and gas control knob are located on the valve. A wire harness connects the terminals from the gas valve to the electronic ignition control. 24V applied to the termi nals energizes the valve.

Inlet and outlet pressure taps are located on the valve. A regu lator adjustment screw is located on the valve.

LPG change over kits are available from Lennox. Kits include burner orifices and a gas valve.

Page 26

Page 27

4. Flame Rollout Switches (S47)

Flame rollout switch is a high temperature limit located on top of the burner box, one on each side.- See figure 13. The limit is a N.C. SPST manual‐reset limit. When S47 senses rollout, the circuit breaks and the ignition control immedi ately stops ignition and closes the gas valve. Rollout can be caused by a blocked heat exchanger, flue or lack of com bustion air. The switch is factory set to trip (open) at 210°F and cannot be adjusted. The switch can be manually reset. To manually reset a tripped switch, push the reset button lo cated on the control.

5. Burners

All units use inshot burners. Burners are factory set and re quire no adjustment. Always operate the unit with the burner box front panel in place. Each burner uses an orifice (see table 28 for orifice size) that is precisely matched to the burn

EL296DFV HEATING COMPONENTS

er input. Burners can be removed as a one piece assembly for service. If burner assembly has been removed, it is critical to align center of each burner to the center of the clamshell when re-installing. See more detail in Section VI- MAINTE NANCE.

6. Primary Limit Control (S10)

The primary limit (S10) is located in the heating vestibule pan el. When excess heat is sensed in the heat exchanger, the limit will open. If the limit is open, the furnace control energizes the supply air blower and closes the gas valve. The limit auto matically resets when unit temperature returns to normal. The switch must reset within three minutes or the SureLight control will go into Watch guard for one hour. The switch is factory set and cannot be adjusted. The switch may have a different set point for each unit model number. See Lennox Repair Parts Handbook if limit switch must be replaced,

Burner Assembly

Intake Air Top Cap

Rollout Switch

Sensor

Rollout Switch

Ignitor

Burner Box Cover

Manifold And Gas Orifices

Two-Stage Gas Valve

FIGURE 13

Page 27

Page 28

Check ignitor circuit for correct resistance.

Test 1

Remove 4-pin plug from control.

Check ohms reading across terminals 1 and 5.

If value is correct, this is the only test needed.

If the reading on the meter is not correct, (0 or infinity)

then a second test is needed.

Meter

(set to ohms)

EL296DFV Ignitor Check

Integrated Control Detail

Seperate the 2-pin jack-plug near the manifold and check

Check ignitor for correct resistance.

resistance of ignitor at the plug. Reading should be

between 39 and 70 ohms. If the reading is correct, then

the problem is with the wiring between the jack-plug and

the control. If reading is not correct, the issue is the ignitor.

Test 2

Meter

(set to ohms)

Insert meter probes into terminals 1 and 5 (use small

Check ignitor for correct voltage

diameter probes in order not to damage plug).

Check voltage during 20 second ignitor warm up period.

Voltage should read 120 volts +

these values, check for correct supply voltage to furnace.

Test 3

10%. If voltage reads below

Integrated Control Detail

Meter

(set to AC volts)

Integrated Control Detail

FIGURE 14

Page 28

Page 29

7. Combustion Air Inducer (B6) and Cold End Header Box

All EL296DFV(X) units use a two-stage combustion air in ducer to move air through the burners and heat exchanger during heating operation. The blower uses a 120VAC mo tor. The motor operates during all heating operation and is controlled by integrated control control A92. The inducer also operates for 15 seconds before burner ignition (pre‐ purge) and for 5 seconds after the gas valve closes (post‐ purge). The inducer operates on low speed during firststage heat, then switches to high speed for second stage heat.

NOTE - Each furnace model uses a unique CAI. Refer to Lennox Repair Parts listing for correct inducer for replace ment.

The combustion air inducer 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 pres sure at unit start up. The channel contains an orifice used to regulate flow created by the combustion air inducer. The box has pressure taps for the combustion air inducer pressure switch hoses. The pressure switch measures the pressure differential across the combustion air induc er orifice or difference in the channel and the box. If re

placement is necessary the gaskets used to seal the box to the vestibule panel and the combustion air in ducer to the box, must also be replaced.

A proving switch connected to the combustion air inducer ori fice plate is used to prove inducer operation. The combustion air inducer orifice will be different for each model. See table 16 for orifice sizes. The pressure switch measures the pres sure differential across the combustion air inducer orifice. When the proving switch opens, the furnace control (A92) im mediately closes the gas valve to prevent burner operation.

TABLE 16

EL296DFV(X) Unit

C.A.I. Orifice Size

The switches are a single‐pole single‐throw proving switch

electrically connected to the integrated control. The purpose

of the switch is to prevent burner operation if the combustion

air inducer is not operating or if the flue becomes obstructed.

On heat demand (first or second stage) the switch senses that the combustion air inducer is operating. It closes a cir cuit to the integrated control when pressure inside the com bustion air inducer decreases to a certain set point. Set points vary depending on unit size. See table 17. The pressure sensed by the switch is negative relative to atmo spheric pressure. If the flue becomes obstructed during op eration, the switch senses a loss of negative pressure (pressure becomes more equal with atmospheric pres sure) and opens the circuit to the furnace control and gas valve. A bleed port on the switch allows relatively dry air in the vestibule to purge switch tubing, to prevent condensate build up.

COMBUSTION AIR PRESSURE SWITCH

Tap (negative - )

Tap (positive +)

Low Fire Switch

3/16 Terminals

" Terminals

1/4

High Fire Switch

FIGURE 15

-045 0.618

-070 0.810

-090 0.920

-110 1.040

8. Combustion Air Inducer Pressure Switch (S18)

EL296DFV(X) series units are equipped with a dual com bustion air pressure switch (first and second stage) located on the combustion air inducer orifice bracket. See figure 15. The switch is connected to the combustion air inducer hous ing by means of a flexible silicone hose. It monitors negative air pressure in the combustion air inducer housing.

Page 29

NOTE - The switch is factory set and is not field adjustable. It is a safety shut‐down control in the furnace and must not be by-passed for any reason. If switch is closed or bypassed, the control will not initiate ignition at start up.

TABLE 17

EL296DFV(X)

Unit

-045 0.35 0.60

-070 0.45 0.90

-090 0.50 0.90

-110 0.45 0.90

Set Point Low

Heat

Set Point High Heat

Page 30

Pressure Switch Check

To check pressure switch differential, refer to figure 16 and use the provided fittings and tubing to follow the steps be low.

1 - Remove thermostat demand and allow unit to cycle

off.

2 - Remove the tubing from the negative side (red and black

or red) and positive side (black) of the pressure switch (leave both connected to cold end header box).

3 - Take the 2” length square tubing and connect to the

positive (+) side of the pressure switch. Take the 10” length square tubing and tee into the tubing from the positive side of the cold end header box and the other side of the 2” square tubing. Connect the other end of the 10” square tubing the the positive (+) side of the measuring device.

4 - Take a second piece the 2” length square tubing and

connect to the negative (-) side of the pressure switch. Take a second piece of 10” length square tubing and tee into the tubing from the negative (-) side of the cold end header box and the other side of the 2” square tub ing. Connect the other end of the 10” square tubing the the negative (-) side of the measuring device.

PRESSURE SWITCH CHECK

Black Tubing

(positive +)

Te e

5 - Operate unit and observe manometer reading.

Readings will change as heat exchanger warms.

a. Take one reading immediately after start‐up. b. Take a second reading after unit has reached steady state (approximately 5 minutes). This will be the pres sure differential.

The pressure differential should be at least

0.15” greater than those listed in the table 17. Read ings in table are the set points or “break points”.

6 - Remove thermostat demand and allow to cycle off. 7 - Replace original pressure switch tubing.

NOTE - Pressure differential values (set point) in table are the ”break”, or ”open” specifications. ”Make”, or ”close” pressure differentials are 0.15” greater than the set points listed in table.

2” long Square

Tubing

Red and Black

or Red Tubing

(negative -)

10” Long Square Tubing

Measuring Device

FIGURE 16

Page 30

Page 31

II-PLACEMENT AND INSTALLATION

Pipe & Fittings Specifications

All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the Ameri can Society for Testing and Materials (ANSI/ASTM) stan dards. The solvent shall be free flowing and contain no lumps, undissolved particles or any foreign matter that ad versely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratifica tion, or separation that cannot be removed by stirring. Re fer to the table 18 below for approved piping and fitting ma terials.

CAUTION

Solvent cements for plastic pipe are flammable liq uids and should be kept away from all sources of ignition. Do not use excessive amounts of solvent cement when making joints. Good ventilation should be maintained to reduce fire hazard and to minimize breathing of solvent vapors. Avoid contact of ce ment with skin and eyes.

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe) D1785 Schedule 40 PVC (Cellular Core Pipe) F891

Schedule 40 PVC (Fittings) D2466

Schedule 40 CPVC (Pipe) F441

Schedule 40 CPVC (Fittings) F438

SDR-21 PVC or SDR-26 PVC (Pipe) D2241

SDR-21 CPVC or SDR-26 CPVC (Pipe) F442

Schedule 40 ABS Cellular Core DWV (Pipe) F628

Schedule 40 ABS (Pipe) D1527

Schedule 40 ABS (Fittings) D2468

ABS-DWV (Drain Waste & Vent) (Pipe & Fittings)

PVC-DWV (Drain Waste & Vent) Pipe & Fittings)

PRIMER & SOLVENT CEMENT

PVC & CPVC Primer F656 PVC Solvent Cement D2564

CPVC Solvent Cement F493

ABS Solvent Cement D2235

PVC/CPVC/ABS All Purpose Cement For Fittings & Pipe of the same material

ABS to PVC or CPVC Transition Solvent Cement

CANADA PIPE & FITTING & SOLVENT

CEMENT

PVC & CPVC Pipe and Fittings PVC & CPVC Solvent Cement

ABS to PVC or CPVC Transition Cement

POLYPROPYLENE VENTING SYSTEM ULC-S636 PolyPro® by Duravent ULC-S636 InnoFlue® by Centrotherm ULC-S636

TABLE 18

D2661

D2665

ASTM

SPECIFICATION

D2564, D2235, F493

D3138

MARKING

ULCS636

IMPORTANT

EL296DFV exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fittings in the unit.

Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to Table 18. As an alter nate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materi als. Use transition solvent cement when bonding ABS to ei ther PVC or CPVC.

Low temperature solvent cement is recommended during cooler weather. Metal or plastic strapping may be used for vent pipe hangers. Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean in side socket surface of fitting and male end of pipe to depth of fitting socket.

Canadian Applications Only - Pipe, fittings, primer and solvent cement used to vent (exhaust) this ap pliance must be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent (ex haust) system. In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection.

Venting Options

The EL296DFV is shipped with vent exhaust / air intake connection at the top cap. See figure 17. Using parts pro vided, the furnace may be field modified to have these connections on the right side of the furnace cabinet. See figure 19 and follow the steps below. For left side venting order kit 87W73.

1 - Remove inner blower door.

2 - Loosen hose clamps which attach rubber fittings to the

white PVC pipes inside the vestibule area. See figure

17.

3 - Loosen the clamp which secures the pipes at the blow

er deck. See figure 17.

4 - Remove white PVC pipes, slide up and out thru the top

cap.

5 - Remove the black plastic fitting in top cap which pre

viously aligned the PVC pipes.

6 - Remove the remaining parts of the pipe clamp at the

blower deck.

7 - Remove the sheet metal patch plate on the side of the

cabinet which covers the openings for side venting op tion. Save screws for reuse.

8 - Re-use the patch plate to cover the hole in the top cap.

See figure 18. Remove the 2 screws which secure the top cap to the furnace on the right side and re-install securing the right edge of the patch plate and the right side of the top cap to the furnace. Use 2 self-drilling sheet metal screws (provided) to finish securing the left edge of the patch plate on the left side.

Page 31

Page 32

9 - Use a utility knife to cut out the cabinet insulation for

the right side vent / air intake.

10 -Install the two 90° street elbows (provided) through the

side of the cabinet. The male side of each elbow should extend down through the blower deck and con nect to the rubber fittings below. Once the elbows are properly positioned, tighten each clamp.

11 - Peel protective backing from side vent sealing gaskets

(2) and apply to side vent sealing plates (2) as shown in figure 19.

12 -Install the side vent sealing plates and gaskets on the

exterior of the cabinet as shown in figure 19. Secure with six mounting screws (four reused and two pro vided from bag assembly). Holes are pre-punched in the parts and cabinet, no drilling is required.

13 -Install sheet metal screws (provided) to seal extra two

holes in cabinet not used with side vent clamps.

Patch Plate Top Cap

Sheet Metal

Patch Plate

IMPORTANT

Side vent sealing plates and side vent sealing gas kets must be used when converting to right side venting. Failure to use gaskets and plates may lead to improper operation of unit.

Top Vent Configuration

Exhaust/Air

Intake Connections

Pipe Clamp

FIGURE 18

FIGURE 17

Hose Clamp

Page 32

Page 33

Right Side Vent Configuration

Sealing Plate

Side Vent

Sealing Gaskets

Side Vent

Exhaust

Street Elbows (2)

FIGURE 19

Intake

Page 33

Page 34

Input Size

045

070

090

110

OUTDOOR TERMINATION USAGE*

TABLE 19

STANDARD CONCENTRIC

Flush

Vent Pipe

Dia. in.

Mount

Kit

51W11

(US)

51W12

2 inch 3 inch 2 inch

22G44 (US)

30G28 (CA)

(CA)

2-1/2

YES YES

YES YES YES

2 YES YES YES

2-1/2 YES YES

3 YES YES

Wall Kit Wall Ring Kit

44J40

(US)

81J20 (CA)

YES

15F74

YES

1-1/2 inch 2 inch 3 inch

Field

Fabricated

YES

YES YES YES

71M80

(US)

44W92

(CA)

YES

69M29

(US)

44W92

(CA)

60L46 (US)

44W93 (CA)

NOTE - Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total vent length calculations. See vent length tables.

* Kits must be properly installed according to kit instructions.

Requires field-provided outdoor 1-1/2” exhaust accelerator.

Concentric kits 71M80 and 44W92 include 1-1/2” outdoor accelerator, when used with 045 and 070 input models.

Flush mount kits 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 045, 070 and 090 input models.

Termination kits 30G28, 44W92, 4493 and 81J20 are certified to ULC S636 for use in Canada only.

See table 24 for vent accelerator requirements.

Page 34

Page 35

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.

DANGER

DANGER OF EXPLOSION!

Fumes from PVC glue may ignite during system check. Allow fumes to dissipate for at least 5 minutes before placing unit into operation.

1 - Measure and cut vent pipe to desired length. 2 - Debur and chamfer end of pipe, removing any ridges

or rough edges. If end is not chamfered, edge of pipe may remove cement from fitting socket and result in a leaking joint.

NOTE - Check the inside of vent pipe thoroughly for any obstruction that may alter furnace operation.

3 - Clean and dry surfaces to be joined. 4 - Test fit joint and mark depth of fitting on outside of pipe. 5 - Uniformly apply a liberal coat of PVC primer for PVC or

use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket.

6 - Promptly apply solvent cement to end of pipe and in

side socket surface of fitting. Cement should be ap plied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply sec ond coat to end of pipe.

NOTE - Time is critical at this stage. Do not allow prim er to dry before applying cement.

7 - Immediately after applying last coat of cement to pipe,

and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into socket until it bottoms out. Turn PVC pipe 1/4 turn dur ing assembly (but not after pipe is fully inserted) to dis tribute cement evenly. DO NOT turn ABS or cellular core pipe.

NOTE - Assembly should be completed within 20 sec onds after last application of cement. Hammer blows should not be used when inserting pipe.

8 - After assembly, wipe excess cement from pipe at end

of fitting socket. A properly made joint will show a bead around its entire perimeter. Any gaps may indi cate an improper assembly due to insufficient sol vent.

9 - Handle joints carefully until completely set.

Venting Practices

Piping Suspension Guidelines

SCHEDULE 40

PVC - 5'

all other pipe* - 3'

* See table 18 for allowable pipe.

NOTE - Isolate piping at the point where it exits the outside wall or roof in order to prevent transmission of vibration to the structure.

Wall Thickness Guidelines

24” maximum 3/4” minimum

inside outside

FIGURE 20

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

FURNACE

(Replaced by EL193)

If an EL296DFV furnace replaces a furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the heat of the original furnace flue prod ucts, the existing vent pipe is probably oversized for the single water heater or other appliance. The vent should be checked for proper draw with the remaining appliance.

FIGURE 21

Wall

REPLACING FURNACE THAT

WAS PART OF A COMMON

VENT SYSTEM

WATER

HEATER

OPENINGS

(To Adjacent

Room)

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Page 36

9. In areas where piping penetrates joists or interior walls, hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger.

10. When furnace is installed in a residence where unit is shut down for an extended period of time, such as a vacation home, make provisions for draining conden sate collection trap and lines.

Removal of the Furnace from Common Vent

In the event that an existing furnace is removed from a venting system commonly run with separate gas ap pliances, the venting system is likely to be too large to properly vent the remaining attached appliances.

Conduct the following test while each appliance is operat ing and the other appliances (which are not operating) re main connected to the common venting system. If the venting system has been installed improperly, you must correct the system as indicated in the general venting re quirements section.

WARNING

CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each

appliance connected to the venting system being placed into operation could result in carbon mon oxide poisoning or death. The following steps shall be followed for each ap pliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

1 - Seal any unused openings in the common venting sys

tem.

2 - Inspect the venting system for proper size and horizontal

pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

3 - Close all building doors and windows and all doors be

tween the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dry

ers and any appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will oper ate at maximum speed. Do not operate a summer ex haust fan. Close fireplace dampers.

4 - Follow the lighting instructions. Turn on the appliance

that is being inspected. Adjust the thermostat so that the appliance operates continuously.

5 - After the main burner has operated for 5 minutes, test

for leaks of flue gases at the draft hood relief opening. Use the flame of a match or candle.

6 - After determining that each appliance connected to the

common venting system is venting properly, (step 3) return all doors, widows, exhaust fans, fireplace damp ers, and any other gas-burning appliances to their pre vious mode of operation.

7 - If a venting problem is found during any of the preced

ing tests, the common venting system must be modi fied to correct the problem.

Resize the common venting system to the minimum vent pipe size determined by using the appropriate tables in Appendix G. (These are in the current stan dards of the National Fuel Gas Code ANSI Z223.1.

Exhaust Piping (Figures 23 and 24)

Route piping to outside of structure. Continue with installa tion following instructions given in piping termination sec tion.

CAUTION

Do not discharge exhaust into an existing stack or stack that also serves another gas appliance. If verti cal discharge through an existing unused stack is re quired, 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 pres sure and must be completely sealed to prevent leak age of combustion products into the living space.

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Vent Piping Guidelines

NOTE - Lennox has approved the use of DuraVent Centrotherm manufactured vent pipe and terminations as

an option to PVC. When using the PolyPro InnoFlue

by Centrotherm venting system the vent pipe re

by DuraVent or

quirements stated in the unit installation instruction – min imum & maximum vent lengths, termination clearances, etc. – apply and must be followed. Follow the instructions provided with PoyPro by DuraVent and InnoFlue by Cen trotherm venting system for assembly or if requirements are more restrictive. The PolyPro by Duravent and In noFlue by Centrotherm venting system must also follow the uninsulated and unconditioned space criteria listed in table 22.

The EL296DFV can be installed as either a Non-Direct Vent or a Direct Vent gas central furnace.

NOTE - In Non‐Direct Vent installations, combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged outdoors. In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged outdoors.

Intake and exhaust pipe sizing -- Size pipe according to

tables 20 and 21. Count all elbows inside and outside the home. Table 20 lists the minimum vent pipe lengths per mitted. Table 21 lists the maximum pipe lengths permitted.

TABLE 20

MINIMUM VENT PIPE LENGTHS

EL296DFV

MODEL

045, 070, 090, 110

*Any approved termination may be added to the minimum length listed.

MIN. VENT LENGTH*

15 ft. or

5 ft plus 2 elbows or

10 ft plus 1 elbow

Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping Terminations should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination. Refer to table 24.

In some applications which permit the use of several differ ent sizes of vent pipe, a combination vent pipe may be used. Contact Lennox' Application Department for assis tance in sizing vent pipe in these applications.

and

NOTE - Exhaust pipe MUST be glued to furnace exhaust fittings.

NOTE - Exhaust piping should be checked carefully to make sure there are no sags or low spots.

NOTE - If right side venting option is used, you must include the elbow at the furnace in the elbow count. If transitioning to 3” dia pipe, this elbow equates to 20' of equivalent vent length for all models.

Use the following steps to correctly size vent pipe diameter.

Piping Size Process

What is the

furnace capacity?

045, 070, 090,

110 or 135?

Which style termination

being used?

Standard or concentric?

See table 19.

Which needs

most elbows?

Intake or

exhaust?

How many elbows? Count all elbows inside

and outside house.

Desired pipe size?

2”, 2-1/2”, 3”

What is the altitude of the furnace installation?

IMPORTANT

Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations.

NOTE - It is acceptable to use any pipe size which fits within the guidelines allowed in table 21.

NOTE toward unit. A minimum of 1/4” (6mm) drop for each 12” (305mm) of horizontal run is mandatory for drainage.

All horizontal runs of exhaust pipe must slope back

Page 37

Use table 21 or 23 to find max intake or exhaust pipe

length. Includes all vent pipe and elbows inside and outside the house.

FIGURE 22

Page 38

Maximum Allowable Intake or Exhaust Vent Length

TABLE 21

Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

Standard Termination at Elevation 0 - 4500 ft

Number Of

90° Elbows

Used

1 71 56 34 14 105 105 83 48 128 127 108 108 2 66 51 29 9 100 100 78 43 123 122 103 103 3 61 46 24 4 95 95 73 38 118 117 98 98 4 56 41 19 n/a 90 90 68 33 113 11 2 93 93 5 51 36 14 n/a 85 85 63 28 108 107 88 88 6 46 31 9 n/a 80 80 58 23 101 102 83 83 7 41 26 4 n/a 75 75 53 18 98 97 78 78 8 36 21 n/a n/a 70 70 48 13 93 92 73 73 9 31 16 n/a n/a 65 65 43 8 88 87 68 68

10 26 11 n/a n/a 60 60 38 3 83 82 63 63

Number Of 90° Elbows

Used

1 71 56 34 n/a 105 105 83 48 128 127 108 108 2 66 51 29 n/a 100 100 78 43 123 122 103 103 3 61 46 24 n/a 95 95 73 38 118 11 7 98 98 4 56 41 19 n/a 90 90 68 33 113 11 2 93 93 5 51 36 14 n/a 85 85 63 28 108 107 88 88 6 46 31 9 n/a 80 80 58 23 103 102 83 83 7 41 26 4 n/a 75 75 53 18 98 97 78 78 8 36 21 n/a n/a 70 70 48 13 93 92 73 73 9 31 16 n/a n/a 65 65 43 8 88 87 68 68

10 26 11 n/a n/a 60 60 38 3 83 82 63 63

045 070 090 110 045 070 090 110 045 070 090 110

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

Standard Termination Elevation 4500 - 10,000 ft

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

Concentric Termination at Elevation 0 - 4500 ft

Number Of 90°

Elbows Used

1 63 48 32 12 95 95 79 44 111 111 104 104 2 58 43 27 7 90 90 74 39 106 106 99 99 3 53 38 22 2 85 85 69 34 101 91 94 94 4 48 33 17 5 43 28 12 75 75 59 24 91 91 84 84 6 38 23 7 70 70 54 19 96 86 79 79 7 33 18 2 65 65 49 14 81 81 74 74 8 28 13 9 23 8 55 55 39 4 71 71 64 64

10 18 3 50 50 34 n/a 66 66 59 59

Number Of 90°

Elbows Used

1 63 48 32 2 58 43 27 90 90 74 39 106 106 99 99 3 53 38 22 85 85 69 34 101 101 94 94 4 48 33 17 80 80 64 29 96 96 89 89 5 43 28 12 75 75 59 24 91 91 84 84 6 38 23 7 70 70 54 19 86 86 79 79 7 33 18 2 65 65 49 14 81 81 74 74 8 28 13 9 23 8 55 55 39 4 71 71 64 64

10 18 3 50 50 34 n/a 66 66 59 59

045 070 090 110 045 070 090 110 045 070 090 110

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

80 80 64 29 96 96 89 89

n/a

60 60 44 9 76 76 69 69

n/a

Concentric Termination Elevation 4501 - 10,000 ft

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

95 95 79 44 111 111 104 94

n/a

60 60 44 9 76 76 69 69

n/a

Page 38

Page 39

TYPICAL EXHAUST PIPE CONNECTIONS

Pipe size determined in table 21.

*2”

2”

DO NOT transition from smaller

2”

3”

TRANSITION

to larger pipe size in horizontal

runs of exhaust pipe.

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

NOTE − Exhaust pipe and intake pipe must be the same diameter.

FIGURE 23

INTAKE

EXHAUST

TOP VIEW

Pipe size determined in table 21.

TYPICAL INTAKE PIPE CONNECTIONS

2”

TRANSITION

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

NOTE − Intake pipe and exhaust pipe must be the same diameter.

2”

3”

*2”

2”

*2”

2”

TRANSITION

*2”

2”

3”

INTAKE

FIGURE 24

EXHAUST

TOP VIEW

Page 39

Page 40

TYPICAL EXHAUST CONNECTIONS WITH RIGHT SIDE VENT OPTION

Pipe Length

4” Maximum

2”

Street Ell

(Not Furnished)

2”

TRANSITION

2”

”

*2”

Plate

(Furnished)

TOP VIEW

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

Intake pipe and exhaust pipe must be the same diameter.

NOTE

FIGURE 25

TYPICAL AIR INTAKE PIPE CONNECTIONS WITH RIGHT SIDE VENT OPTION

2”

*2”

Street Ell

(Not Furnished)

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

NOTE Intake pipe and exhaust pipe must be the same diameter.

2”

TRANSITION

”

*2”

Plate

(Furnished)

TOP VIEW

FIGURE 26

Page 40

Page 41

Intake Piping

The EL296DFV furnace may be installed in either direct

vent or non-direct vent applications. In non-direct vent

applications, when intake air will be drawn into the furnace

from the surrounding space, the indoor air quality must be

considered. Guidelines listed in Combustion, Dilution and

Ventilation Air section must be followed.

Follow the next two steps when installing the unit in Direct

Vent applications, where combustion air is taken from

outdoors and flue gases are discharged outdoors. The

provided air intake screen must not be used in direct

vent applications (outdoors).

1 - Use cement or a sheet metal screw to secure the in

take pipe to the inlet air connector.

2 - If intake air is drawn from a ventilated crawlspace (fig

ure 28) or ventilated attic (figure 27) the exhaust vent

length must not exceed those listed in table 23. If 3” di

ameter pipe is used, reduce to 2” diameter pipe to ac

commodate the debris screen.

3 - Route piping to outside of structure. Continue with

installation following instructions given in general

guide lines for piping terminations and intake and ex

haust piping terminations for direct vent sections. Re

fer to table

21 for pipe sizes.

(Inlet Air from Ventilated Crawlspace and Outlet Air to Outside)

Roof Terminated

Exhaust Pipe

Ventilation

Louvers

(Crawl space)

(Field Provided)

EQUIPMENT IN CONFINED SPACE

Furnace

Coupling or 3 in. to 2 in.

Transition

12 in.(305mm)

*Intake Debris Screen Provided)

Inlet Air

(Minimum

Above crawl

space floor)

* See table 23 for maximum vent lengths

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm hour of the total input rating of all equipment in the enclosure.

per 1.17kW) per

FIGURE 27

(Inlet Air from Ventilated Attic and Outlet Air to Outside)

Roof Terminated

Exhaust Pipe

EQUIPMENT IN CONFINED SPACE

Ventilation Louvers

Inlet Air

(Minimum

12 in.(305mm) Above

attic floor)

CAUTION

If this unit is being installed in an application with combustion air coming in from a space serviced by an exhaust fan, power exhaust fan, or other device which may create a negative pressure in the space, take care when sizing the inlet air opening. The in let air opening must be sized to accommodate the maximum volume of exhausted air as well as the maximum volume of combustion air required for all gas appliances serviced by this space.

*Intake Debris

Screen

(Provided)

Furnace

* See table 23 for maximum vent lengths

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm hour of the total input rating of all equipment in the enclosure.

per 1.17kW) per

FIGURE 28

Page 41

Page 42

TYPICAL AIR INTAKE PIPE CONNECTIONS

NON−DIRECT VENT APPLICATIONS

AIR

INTAKE

SCREEN

(Provided)

NOTE - Air intake screen and elbow may be rotated, so that screen may be positioned to face forward or to either side.

FIGURE 29

Follow the next two steps when installing the unit in Non‐ Direct Vent applications where combustion air is taken from indoors and flue gases are discharged outdoors.

1 - Use field-provided materials and the factory-provided

air intake screen to route the intake piping as shown in figure 29. Maintain a minimum clearance of 3” (76mm) around the air intake opening. The air intake opening (with the protective screen) should always be directed forward, or sideways.

2 - Use cement to secure the intake pipe to the connector,

if desired.

General Guidelines for Vent Terminations

In Non‐Direct Vent applications, combustion air is taken from indoors and the flue gases are discharged to the out doors. The EL296DFV is then classified as a non‐direct vent, Category IV gas furnace.

In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the out

doors. The EL296DFV is then classified as a direct vent, Category IV gas furnace.

In both Non‐Direct Vent and Direct Vent applications, the vent termination is limited by local building codes. In the absence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSA-B149 Natural Gas and Propane Installation Codes in Canada for details.

Position termination according to location given in figure 31 or 32. In addition, position termination so it is free from any obstructions and 12” above the average snow accumula tion.

At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8m) of an outdoor AC unit because the condensate can damage the painted coating.

NOTE - See table 22 for maximum allowed exhaust pipe length without insulation in unconditioned space during winter design temperatures below 32°F (0°C). If required exhaust pipe should be insulated with 1/2” (13mm) Arma flex or equivalent. In extreme cold climate areas, 3/4” (19mm) Armaflex or equivalent may be necessary. Insula tion must be protected from deterioration. Armaflex with UV protection is permissable. Basements or other en closed areas that are not exposed to the outdoor ambient temperature and are above 32 degrees F (0°C) are to be considered conditioned spaces.

IMPORTANT

Do not use screens or perforated metal in exhaust 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).

Page 42

Page 43

Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For

TABLE 22

Winter Design Temperatures Two - Stage High Efficiency Furnace

Winter Design

Temperatures

32 to 21

(0 to -6)

°F (°C)

Vent Pipe

Diameter

045 070 090 110

PVC

PP PVC

2 in. 21 18 33 30 46 42 30 30

2-1/2 in. 16 N/A 26 N/A 37 N/A 36 N/A

Unit Input Size

PP PVC

3 in. 12 12 21 21 30 30 29 29

2 in 11 9 19 17 28 25 27 24

20 to 1

(-7 to -17)

2-1/2 in. 7 N/A 14 N/A 21 N/A 20 N/A

3 in. N/A N/A 9 9 16 16 14 14

2 in. 6 4 12 10 19 16 18 15

0 to -20

(-18 to -29)

2-1/2 in. N/A N/A 7 N/A 13 N/A 12 N/A

3 in. N/A N/A N/A N/A 8 8 7 7

1Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.

Poly-Propylene vent pipe (PP) by Duravent and Centrotherm.

NOTE - Concentric terminations are the equivalent of 5' and should be considered when measuring pipe length. NOTE - Maximum uninsulated vent lengths listed may include the termination(vent pipe exterior to the structure) and cannot exceed 5 linear feet or the

maximum allowable intake or exhaust vent length listed in table 21 or 23 which ever is less. NOTE - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See figure30.

Conditioned

Space

Conditioned

Space

FIGURE 30

Pipe Insulation

Unconditioned

Space

Exhaust

Pipe

Intake

Pipe

Page 43

Page 44

Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space For Intake Air in Feet

TABLE 23

NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

Standard Termination at Elevation 0 - 10,000 ft

Number Of

90° El

bows

Used

045 070 090 110 045 070 090 110 045 070 090 110

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

1 61 46 24 4 90 90 68 33 108 107 88 88 2 56 41 19

85 85 63 28 103 102 83 83 3 51 36 14 80 80 58 23 98 97 78 78 4 46 31 9 75 75 53 18 93 92 73 73 5 41 26 4 70 70 48 13 88 87 68 68 6 36 21

n/a

65 65 43 8 81 82 63 63 7 31 16 60 60 38 3 78 77 58 58 8 26 11 55 55 33 n/a 73 72 53 53

n/a

9 21 6 50 50 28 n/a 68 67 48 48

10 16 1 45 45 23 n/a 63 62 43 43

Page 44

Page 45

VENT TERMINATION CLEARANCES

FOR NON-DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

INSIDE CORNER

DETAIL

Fixed

Closed

Operable

VENT TERMINAL

AIR SUPPLY INLET

US Installations

A =

Clearance above grade, veranda,

porch, deck or balcony

B =

Clearance to window or

door that may be opened

C =

Clearance to permanently

closed window

Vertical clearance to ventilated soffit

D =

located above the terminal within a

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

4 feet (1.2 m) below or to side of opening;

1 foot (30cm) above opening

* 12”

* Equal to or greater than soffit depth.

horizontal distance of 2 feet (610 mm)

from the center line of the terminal

E =

F =

G =

H =

Clearance to unventilated soffit

Clearance to outside corner

Clearance to inside corner

Clearance to each side of center line ex

tended above meter / regulator assembly

I =

Clearance to service regulator

vent outlet

J =

Clearance to non-mechanical air

supply inlet to building or the com

bustion air inlet to any other ap

* Equal to or greater than soffit depth.

* No minimum to outside corner * No minimum to outside corner

3 feet (.9m) within a height 15 feet (4.5m)

above the meter / regulator assembly

* 3 feet (.9m)

4 feet (1.2 m) below or to side of opening;

1 foot (30 cm) above opening

pliance

K =

L =

Clearance to mechanical air sup

ply inlet

Clearance above paved sidewalk or

3 feet (.9m) above if within 10 feet

(3m) horizontally

7 feet (2.1m)†

paved driveway located on public property

Clearance under veranda, porch, deck or balcony

M =

In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code

In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code

† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible.

*12 inches (305mm)‡

FIGURE 31

Fixed

Closed

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

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)

* 12”

* Equal to or greater than soffit depth.

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

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)

6 feet (1.8m)

7 feet (2.1m)†

12 inches (305mm)‡

*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, clearance will be in accordance with local installation codes and the requirements of the gas supplier and these instal lation instructions.”

Page 45

Page 46

VENT TERMINATION CLEARANCES

FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

INSIDE CORNER

DETAIL

Fixed

Closed

Operable

VENT TERMINAL

AIR SUPPLY INLET

US Installations

A =

B =

Clearance above grade, veranda,

porch, deck or balcony

Clearance to window or

door that may be opened

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

6 inches (152mm) for appliances <10,000

Btuh (3kw), 9 inches (228mm) for ap

pliances > 10,000 Btuh (3kw) and <50,000

Btuh (15 kw), 12 inches (305mm) for ap

pliances > 50,000 Btuh (15kw)

C =

Clearance to permanently

* 12”

closed window

Vertical clearance to ventilated soffit

D =

located above the terminal within a

* Equal to or greater than soffit depth

horizontal distance of 2 feet (610mm)

from the center line of the terminal

E =

F =

G =

H =

Clearance to unventilated soffit

Clearance to outside corner

Clearance to inside corner

Clearance to each side of center line ex

tended above meter / regulator assembly

I =

Clearance to service regulator

vent outlet

J =

Clearance to non-mechanical air

supply inlet to building or the com

bustion air inlet to any other ap

pliance

* Equal to or greater than soffit depth * Equal to or greater than soffit depth

* No minimum to outside corner

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

Btuh (3kw), 9 inches (228mm) for ap

pliances > 10,000 Btuh (3kw) and <50,000

Btuh (15 kw), 12 inches (305mm) for ap

pliances > 50,000 Btuh (15kw)

K =

Clearance to mechanical air sup

ply inlet

L =

Clearance above paved sidewalk or

paved driveway located on public property

Clearance under veranda, porch, deck or balcony

M =

In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code

In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code

† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.

‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Lennox recommends avoiding this location if possible.

3 feet (.9m) above if within 10 feet

(3m) horizontally

* 7 feet (2.1m)

*12 inches (305mm)‡

FIGURE 32

Fixed

Closed

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

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)

* 12”

* Equal to or greater than soffit depth* Equal to or greater than soffit depth

* No minimum to outside corner

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

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)

6 feet (1.8m)

7 feet (2.1m)†

12 inches (305mm)‡

Page 46

Page 47

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

NOTE - In Direct Vent installations, combustion air is tak en from outdoors and flue gases are discharged to out doors.

NOTE - Flue gas may be slightly acidic and may adversely affect some building materials. If any vent termination is used and the flue gasses may impinge on the building ma terial, a corrosion-resistant shield (minimum 24 inches square) should be used to protect the wall surface. If the optional tee is used, the protective shield is recommended. The shield should be constructed using wood, plastic, sheet metal or other suitable material. All seams, joints, cracks, etc. in the affected area should be sealed using an appropriate sealant. See figure 36.

Intake and exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In at tic or closet installations, vertical termination through the roof is preferred. Figures 33 through 41 show typical ter minations.

1. Vent terminations are not required to be in the same pressure zone. You may exit the intake on one side of the structure and the exhaust on another side (figure

34). You may exit the exhaust out the roof and the in take out the side of the structure (figure 35).

2. Intake and exhaust pipes should be placed as close together as possible at termination end (refer to il lustrations). Maximum separation is 3” (76mm) on roof terminations and 6” (152mm) on side wall termina tions.

NOTE - When venting in different pressure zones, the maximum separation requirement of intake and ex haust pipe DOES NOT apply.

3. On roof terminations, the intake piping should termi nate straight down using two 90° elbows (See figure

33).

4. Exhaust piping must terminate straight out or up as shown. A reducer may be required on the exhaust pip ing at the point where it exits the structure to improve the velocity of exhaust away from the intake piping. See table 24.

TABLE 24

EXHAUST PIPE TERMINATION SIZE REDUCTION

EL296

MODEL

*045 and *070

*090 2” (51mm)

110 2” (51mm)

*EL296DFV-045, -070 and -090 units with the flush-mount termina tion must use the 1-1/2”accelerator supplied with the kit.

Termination

Pipe Size

1-1/2” (38mm)

5. On field-supplied terminations for side wall exit, ex haust piping may extend a maximum of 12 inches (305mm) for 2” PVC and 20 inches (508mm) for 3” (76mm) PVC beyond the outside wall. Intake piping should be as short as possible. See figure 36.

NOTE - Care must be taken to avoid recirculation of exhaust back into intake pipe.

6. On field supplied terminations, a minimum distance between the end of the exhaust pipe and the end of the intake pipe without a termination elbow is 8” and a minimum distance of 6” with a termination elbow. See figure 36.

Inches(mm)

8” (203mm) MIN

12” (305mm) ABOVE

AVERAGE SNOW ACCUMULATION

3” (76mm) OR

2” (51mm) PVC

PROVIDE SUPPORT

FOR INTAKE AND

EXHAUST LINES

DIRECT VENT ROOF TERMINATION KIT

3”(76mm) MAX.

(15F75 or 44J41)

SIZE TERMINATION

PIPE PER TABLE 24.

UNCONDITIONED

ATTIC SPACE

1/2” (13mm) FOAM

INSULATION IN

UNCONDITIONED

SPACE

FIGURE 33

Exiting Exhaust and Intake Vent

(different pressure zones)

Inlet Air

Exhaust

Pipe

Furnace

(Minimum 12in.

(305 mm) Above

grade or snow

accumulation)

FIGURE 34

Exiting Exhaust and Intake Vent

(different pressure zones)

Roof T

erminated

Exhaust Pipe

Inlet Air

Furnace

(Minimum 12in.

(305 mm) Above

grade or snow

accumulation)

FIGURE 35

Page 47

Page 48

7. If intake and exhaust piping must be run up a side wall to position above snow accumulation or other ob structions, piping must be supported. At least one bracket must be used within 6” from the top of the el bow and then every 24” (610mm) as shown in figure 36, to prevent any movement in any direction. When exhaust and intake piping must be run up an outside

wall, the exhaust piping must be terminated with pipe sized per table 24.The intake piping may be equipped with a 90° elbow turndown. Using turndown will add 5 feet (1.5m) to the equivalent length of the pipe.

8. A multiple furnace installation may use a group of up to four terminations assembled together horizontally, as shown in figure 39.

Page 48

Page 49

NOTE − FIELD−PROVIDED

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

* WALL

SUPPORT

REDUCER MAY BE

TO TERMINATION

Intake Elbow

STRAIGHT

APPPLICATION

EXTENDED

APPLICATION

FIELD FABRICATED WALL TERMINATION

A− Minimum clearance

above grade or average

snow accumulation

B− Maximum horizontal

separation between

intake and exhaust

C1 -Minimum from end of

exhaust to inlet of intake

C2 -Minimum from end of

exhaust to inlet of intake

D− Maximum exhaust

pipe length

E− Maximum wall support

distance from top of each

pipe (intake/exhaust)

See venting table 21 for maximum venting lengths with this arrangement.

* Use wall support every 24” (610 mm). Use two wall supports if extension is greater than 24” (610 mm) but less than 48” (1219 mm).

NOTE − One wall support must be within 6” (152 mm) from top of each pipe (intake and exhaust) to prevent movement in any direction.

2” (51mm)

Vent Pipe

12” (305 mm)

6” (152 mm)

3” (76mm)

Vent Pipe

12” (305 mm)

6” (152 mm)6” (152 mm)

8” (203 mm)8” (203 mm)

6” (152 mm)6” (152 mm)

20” (508 mm)

6” (152 mm)

ALTERNATE TERMINATIONS (TEE & FORTY−FIVE DEGREE ELBOWS ONLY)

2” (51MM)

The exhaust termination tee should be connected to the 2” or 3” PVC flue pipe as shown in the illustration.

12”

Do not use an accelerator in applications that include an exhaust termination tee. The accelerator is not required.

As required. Flue gas may be acidic and may adversely affect some building materials. If a side wall vent

termination is used and flue gases will impinge on the building materials, a corrosion−resistant shield (24 inches square) should be used to protect the wall surface. If optional tee is used, the protective 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.

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 inlet.

Intake Elbow

Intake and Exhaust

Intake

Front View of

Exhaust

A− Clearance above

grade or average snow

accumulation

B− Horizontal

separation between

intake and exhaust

C− Minimum from

end of exhaust to

inlet of intake

D− Exhaust pipe length

E− Wall support distance

from top of each pipe

(intake/exhaust)

Vent Pipe

12” (305 mm) Min. 12” (305 mm) Min.

6” (152 mm) Min. 24” (610 mm) Max.

9” (227 mm) Min.

12” (305 mm) Min. 16” (405 mm) Max.

6” (152 mm) Max.

3” (76MM)

Vent Pipe

6” (152 mm) Min. 24” (610 mm) Max.

9” (227 mm) Min.

12” (305 mm) Min. 20” (508 mm) Max.

6” (152 mm) Max.

FIGURE 36

Page 49

Page 50

12” (305mm)

Minimum

Above Average

Snow

Accumulation

CLAMP

1-1/2” (38mm) accelerator

provided on 71M80 & 44W92

kits for EL296DFV045P36B-

& 070P36B

FLASHING

INTAKE

(Not Furnished)

SHEET METAL STRAP

(Clamp and sheet metal strap

must be field installed to support

the weight of the termination kit.)

FIELD-PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

2” EXTENSION FOR 2” PVC PIPE 1” EXTENSION FOR 3” PVC PIPE

FURNACE

INTAKE

PIPE

FLUSH-MOUNT SIDE WALL TERMINATION

KIT 51W11 (US) or 51W12 (Canada)

4''

FIGURE 40

FURNACE

EXHAUST

PIPE

GLUE EXHAUST

END FLUSH INTO

TERMINATION

1-1/2” ACCELERATOR

(all-045, -070 and -090 units)

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

FIGURE 37

1-1/2” (38mm) accelerator

FIELD-PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE

SIZE TO TERMINATION

EXHAUST

AIR

INTAKE

AIR

(Not Furnished)

OUTSIDE

WALL

CLAMP

provided on 71M80 &

44W92 kits for

EL296DFV045P36B- &

070P36B

INTAKE

AIR

EXHAUST

12” (305mm) Min.

INTAKE

AIR

above grade or

average snow ac

cumulation.

GRADE

DIRECT VENT CONCENTRIC WALL TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

FIGURE 38

AIR

EL296DFV DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

8” - 12”

(203mm - 305mm)

Minimum 12” (305MM)

above chimney top

plate or average snow

accumulation

*SIZE TERMINATION PIPE PER TABLE 24.

NOTE - Do not discharge exhaust gases directly into any chimney or vent stack. If ver tical discharge through an existing unused chimney or stack is required, insert piping inside chimney until the pipe open end is above top of chimney and terminate as illus trated. In any exterior portion of chimney, the exhaust vent must be insulated.

INTAKE PIPE

INSULATION (optional)

SHEET

METAL TOP

PLATE

INSULATE

TO FORM

SEAL

3” - 8” (76mm203mm)

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE *

EXHAUST VENT

1/2” (13mm)

WEATHERPROOF

INSULATION

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

3” - 8”

(76mm-

203mm)

ALTERNATE

INTAKE PIPE

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 41

EXHAUST

VENT

5”

(127mm)

5-1/2”

(140mm)

12”

(305mm)

INTAKE

AIR

18” MAX.

(457mm)

Front View

EXHAUST VENT

12” (305mm) Min.

above grade or

Inches (mm)

INTAKE

average snow ac

cumulation.

AIR

optional intake elbow

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

FIGURE 39

Details of Exhaust Piping Terminations for Non‐Direct Vent Applications

Exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In attic or closet installations, vertical termination through the roof is pre ferred. Figures 42 through 43 show typical terminations.

1. Exhaust piping must terminate straight out or up as shown. The termination pipe must be sized as listed in table 24.The specified pipe size ensures proper ve locity required to move the exhaust gases away from the building.

2. On field supplied terminations for side wall exit, ex haust piping may extend a maximum of 12 inches (305mm) for 2” PVC and 20 inches (508mm) for 3” (76mm) PVC beyond the outside wall.

Page 50

Page 51

3. If exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, pip ing must be supported every 24 inches (610mm). When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow.

4. Distance between exhaust pipe terminations on mul tiple furnaces must meet local codes.

SIZE TERMINATION

PIPE PER TABLE

12” (305mm)

ABOVE AVE.

SNOW

ACCUMULATION

1/2” (13mm) FOAM

INSULATION

24.

CONDENSATE TRAP AND PLUG LOCATIONS

Trap

(same on

right side)

1-1/2 in.

Plug

(same on left

side)

3” (76mm) OR

2” (51mm) PVC

PROVIDE SUPPORT

FOR EXHAUST LINES

UNCONDITIONED

ATTIC SPACE

NON-DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 42

EL296DFV NON-DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

SIZE TERMINATION

PIPE PER TABLE 24.

3” - 8”

(76mm-

Minimum 12” (305MM)

above chimney top

plate or average snow

accumulation

METAL TOP

INSULATE

TO FORM

SEAL

203mm)

SHEET

PLATE

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE

EXHAUST VENT

1/2” (13mm)

WEATHERPROOF

INSULATION

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

3” - 8” (76mm203mm)

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 43

Condensate Piping

This unit is designed for either right‐ or left‐side exit of con densate piping. Refer to figures 44 and 46 for condensate trap locations.

FIGURE 44

1 - Determine which side condensate piping will exit the

unit, location of trap, field-provided fittings and length of PVC pipe required to reach available drain.

2 - For furnaces with a 1/2” drain connection use a 3/8 al

len wrench and remove plug (figure 44) from the cold end header box at the appropriate location on the side of the unit. Install field-provided 1/2 NPT male fitting into cold end header box. For furnaces with a 3/4” drain connection use a large flat head screw driver or a 1/2” drive socket extension and remove plug. Install provided 3/4 NPT street elbow fitting into cold end header box. Use Teflon tape or appropriate pipe dope.

3 - Install the cap over the clean out opening at the base

of the trap. Secure with clamp. See figure 49 (3/4” drain connection) or 50 (1/2” drain connection).

4 - Install drain trap using appropriate PVC fittings, glue

all joints. Glue the provided drain trap as shown in fig ure 49 or 50. Route the condensate line to an open drain.

5 - Figure 47 shows the furnace and evaporator coil using

a separate drain. If necessary, the condensate line from the furnace and evaporator coil can drain togeth er. See figure 48. The field provided vent must be a minimum 1” to a maximum 2” length above the con densate drain outlet connection.

NOTE - If necessary the condensate trap may be installed up to 5 feet away from the furnace. Piping from furnace must slope down a minimum of 1/4” per ft. toward trap.

Page 51

Page 52

NOTE - Appropriately sized tubing and barbed fitting may be used for condensate drain. Attach to the drain on the trap using a hose clamp. See figure 45.

Field Provided Drain Components

Elbow

EL296DFV with Evaporator Coil

Using a Separate Drain

Field Provided Vent

1” min. 2” max. above

condensate drain.

Condensate Drain

Connection

Tubing

Barbed Fitting

Hose Clamp

FIGURE 45

6 - If unit will be started immediately upon completion of

installation, prime trap per procedure outlined in Unit Start-Up section.

Condensate line must slope downward away from the trap to drain. If drain level is above condensate trap, condensate pump must be used. Condensate drain line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line. Heat cable kit is avail able from Lennox in various lengths; 6 ft. (1.8m) - kit no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft. (15.2m) - kit no. 26K70.

CONDENSATE TRAP LOCATION

(shown with right side exit of condensation)

Evaporator Drain Line

(vent required)

Drain

FIGURE 47

IMPORTANT

When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must be vented to relieve pressure in or der for the furnace pressure switch to operate properly.

CAUTION

Do not use copper tubing or existing copper condensate lines for drain line.

EL296DFV with Evaporator Coil Using a Common Drain

Trap can be installed a maximum of 5ft. from furnace (*PVC only)

Field Provided Vent

1” min. 2” max. above

condensate drain.

1” min.

2” max.

5’ max.

to drain

*Piping from furnace must slope down a

minimum 1/4” per ft. toward trap

FIGURE 46

Field Provided Vent

1” min. 2” max. above

condensate drain.

Condensate Drain

Connection

Evaporator Drain Line

(vent required)

FIGURE 48

Page 52

Page 53

TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC

COLD END HEADER BOX WITH 3/4” DRAIN CONNECTION

Optional Condensate Drain Connection

Adapter 3/4 inch slip X

3/4 inch mpt (not furnished)

90° Street Elbow 3/4 inch PVC (not furnished)

Condensate Drain

Connection In Unit

90° Street Elbow 3/4 inch PVC ( furnished)

Trap

Optional Drain Piping FromTrap

Drain Assembly for 1/2 inch Drain Pipe

1/2 inch PVC Pipe

(Not Furnished)

90° Elbow

1/2 inch PVC

(Not Furnished)

Drain

Drain Assembly for 3/4 inch Drain Pipe

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Elbow 3/4 inch PVC

90°

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

Adapter 3/4 inch slip X

3/4 inch mpt (not furnished)

ent

5 Feet

Maximum

3/4 inch PVC Pipe

(Not Furnished)

Coupling 3/4 inch slip X slip

(Not Furnished)

Drain Trap

Assembly

(Furnished)

Condensate Drain

Connection In Unit

90° Elbow

3/4 inch PVC

(Not Furnished)

Drain

DrainTrap Assembly

(Furnished)

(178)

Drain Trap

Clean Out

90° Elbow

3/4 inch PVC

(Not Furnished)

Coupling 3/4 inch slip X slip

Drain

DrainTrap Assembly with 1/2 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

(Not Furnished)

Vent

1/2 inch

Condensate Drain

Connection In Unit

Drain

DrainTrap Assembly with 3/4 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Vent

3/4 inch

Condensate Drain

Connection In Unit

Drain

FIGURE 49

Page 53

Page 54

TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC

COLD END HEADER BOX WITH 1/2” DRAIN CONNECTION

Optional Condensate Drain Connection

Adapter 1/2 inch slip X

1/2 inch mpt (Not Furnished)

90° Street Elbow

1/2 inch PVC

(Not Furnished)

Condensate Drain

Connection In Unit

90° Street Elbow

1/2 inch PVC

(Furnished)

Trap

Optional Drain Piping From Trap

Drain Assembly for 1/2 inch Drain Pipe

1/2 inch PVC Pipe

(Not Furnished)

90° Elbow

1/2 inch PVC

(Not Furnished)

Drain

Drain Assembly for 3/4 inch Drain Pipe

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

90° Elbow 1/2 inch PVC

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

Adapter 1/2 inch slip X

1/2 inch mpt (Not Furnished)

Vent

5 Feet

Maximum

1/2 inch PVC Pipe

(Not Furnished)

Coupling 1/2 inch slip X slip

(Not Furnished)

Drain Trap

Assembly

(Furnished)

Condensate Drain

Connection In Unit

90° Elbow

3/4 inch PVC

(Not Furnished)

Drain

Drain Trap Assembly

(Furnished)

(178)

90° Elbow

3/4 inch PVC

(Not Furnished)

Coupling 3/4 inch slip X slip

Drain

Drain Trap Assembly with 1/2 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

(Not Furnished)

Vent

1/2 inch

Condensate Drain Connection In Unit

Drain

Drain Trap

Clean Out

Drain Trap Assembly with 3/4 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Vent

3/4 inch

Condensate Drain

Connection In Unit

Drain

FIGURE 50

Page 54

Page 55

III-START‐UP

A-Preliminary and Seasonal Checks

1 - Inspect electrical wiring, both field and factory installed

for loose connections. Tighten as required.

2 - Check voltage at disconnect switch. Voltage must be with

in range listed on the nameplate. If not, consult the power company and have voltage condition corrected be fore starting unit.

3 - Inspect condition of condensate traps and drain as

sembly. Disassemble and clean seasonally.

B-Heating Start‐Up

BEFORE LIGHTING the unit, smell all around the fur

nace area for gas. Be sure to smell next to the floor be cause some gas is heavier than air and will settle on the floor.

The gas valve on the EL296DFV is equipped with a gas control switch. Use only your hand to move the switch. Never use tools. If the the switch will not move by hand, replace the valve. Do not try to repair it. Force or at tempted repair may result in a fire or explosion.

Placing the furnace into operation:

EL296DFV units are equipped with a SureLight system. Do not

attempt to manually light burners on this

ignition

furnace. Each time the thermostat calls for heat, the burners will automatically light The ignitor does not get hot when there is no call for heat on units with SureLight ignition system.

Priming Condensate Trap

The condensate trap should be primed with water prior to start-up to ensure proper condensate drainage. Either pour 10 fl. oz. (300 ml) of water into the trap, or follow these steps to prime the trap:

1 - Follow the lighting instructions to place the unit into op

eration.

2 - Set the thermostat to initiate a heating demand.

3 - Allow the burners to fire for approximately 3 minutes. 4 - Adjust the thermostat to deactivate the heating de

mand.

5 - Wait for the combustion air inducer to stop. Set the

thermostat to initiate a heating demand and again al low the burners to fire for approximately 3 minutes.

6 - Adjust the thermostat to deactivate the heating de

mand and again wait for the combustion air inducer to stop. At this point, the trap should be primed with suffi cient water to ensure proper condensate drain opera tion.

WARNING

If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or death.

Gas Valve Operation (Figure 51)

1 - STOP! Read the safety information at the beginning of

this section. 2 - Set the thermostat to the lowest setting. 3 - Turn off all electrical power to the unit.

4 - This furnace is equipped with an ignition device which

automatically lights the burners. Do not try to light the burners by hand.

5 - Remove the upper access panel. 6 - Move gas valve switch to OFF. See figure 51. 7 - Wait five minutes to clear out any gas. If you then smell

gas, STOP! Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instruc tions. If you do not smell gas go to next step.

8 - Move gas valve switch to ON. See figure 51.

WHITE RODGERS GAS VALVE

MANIFOLD

PRESSURE POST

INLET PRESSURE

POST

GAS VALVE SHOWN IN OFF POSITION

HIGH FIRE ADJUSTMENT

SCREW

(under cap)

LOW FIRE ADJUSTMENT

SCREW

(under cap)

FIGURE 51

9 - Replace the upper access panel.

10- Turn on all electrical power to to the unit.

11- Set the thermostat to desired setting.

NOTE - When unit is initially started, steps 1 through 11 may need to be repeated to purge air from gas line.

12- If the appliance will not operate, follow the instructions

“Turning Off Gas to Unit” and call your service techni cian or gas supplier.

Turning Off Gas to Unit

1 - Set the thermostat to the lowest setting. 2 - Turn off all electrical power to the unit if service is to be

performed.

3 - Remove the upper access panel. 4 - Move gas valve switch to OFF. 5 - Replace the upper access panel.

Failure To Operate

If the unit fails to operate, check the following: 1 - Is the thermostat calling for heat? 2 - Are access panels securely in place? 3 - Is the main disconnect switch closed? 4 - Is there a blown fuse or tripped breaker? 5 - Is the filter dirty or plugged? Dirty or plugged filters will

cause the limit control to shut the unit off. 6 - Is gas turned on at the meter? 7 - Is the manual main shut‐off valve open? 8 - Is the internal manual shut‐off valve open? 9 - Is the unit ignition system in lockout? If the unit locks out

again, inspect the unit for blockages.

Page 55

Page 56

IV-HEATING SYSTEM SERVICE CHECKS

A-CSA Certification

All units are CSA design certified without modifications. Refer to the EL296DFV(X) Installation Instruction.

B-Gas Piping

CAUTION

If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall be installed at the gas valve and extend outside the furnace cabinet.

WARNING

Do not exceed 600 in-lbs (50 ft-lbs) torque when attaching the gas piping to the gas valve.

Gas supply piping should not allow more than 0.5”W.C. drop in pressure between gas meter and unit. Supply gas pipe must not be smaller than unit gas connection.

Compounds used on gas piping threaded joints should be resistant to action of liquefied petroleum gases.

C-Testing Gas Piping

IMPORTANT

through Lennox under part number 31B2001. See Corp. 8411-L10, for further details.

Do not use matches, candles, flame or any other source of ignition to check for gas leaks.

D-Testing Gas Supply Pressure

An inlet pressure post located on the gas valve provides ac cess to the supply pressure. See figure 51. Back out the 3/32 hex screw one turn, connect a piece of 5/16 tubing and connect to a manometer to measure supply pressure. See table 28 for supply line pressure.

E-Check Manifold Pressure

NOTE - Pressure test adapter kit (10L34) is available from Lennox to facilitate manifold pressure measurement.

A manifold pressure post located on the gas valve provides access to the manifold pressure. See figure 51. Back out the 3/32 hex screw one turn, connect a piece of 5/16 tubing and connect to a manometer to measure manifold pres sure. To correctly measure manifold pressure, the differential pressure between the positive gas manifold and the nega tive burner box must be considered.

IMPORTANT

For safety, connect a shut‐off valve between the ma nometer and the gas tap to permit shut off of gas pressure to the manometer.

In case emergency shutdown is required, turn off the main shut‐off valve and disconnect the main power to unit. These controls should be properly labeled by the installer.

When pressure testing gas lines, the gas valve must be dis connected and isolated. Gas valves can be damaged if subjected to more than 0.5 psig (14” W.C.). See figure 52. If the pressure is greater than 0.5psig (14”W.C.), use the manual shut-off valve before pressure testing to isolate fur nace from gas supply.

GAS PIPING TEST PROCEDURE

MANUAL MAIN SHUT-OFF VALVE

WILL NOT HOLD TEST PRESSURE

IN EXCESS OF 0.5 PSIG (14”W.C.)

1/8 NPT PLUG

GAS VALVE

FIGURE 52

When checking piping connections for gas leaks, use pre ferred means. Kitchen detergents can cause harmful corro sion on various metals used in gas piping. Use of a specialty Gas Leak Detector is strongly recommended. It is available

CAP

1 - Connect the test gauge positive side “+“ to manifold

pressure tap on gas valve as noted above.

2 - Tee into the gas valve regulator vent hose and connect

to test gauge negative “-”.

3 - Ignite unit on low fire and let run for 5 minutes to allow

for steady state conditions.

4 - After allowing unit to stabilize for 5 minutes, record low

fire manifold pressure and compare to value given in table 28. If necessary, make adjustment. Figure 51 shows location of low fire adjustment screw.

5 - Repeat on high fire and compare to value given in

table 28. If necessary, make adjustment. Figure 51 shows location of high fire adjustment screw.

6 - Shut unit off and remove manometer as soon as an ac

curate reading has been obtained.

7 - Start unit and perform leak check. Seal leaks if found.

The gas valve is factory set and should not require adjust ment. All gas valves are factory regulated.

F- Proper Gas Flow (Approximate)

Furnace should operate at least 5 minutes before check ing gas flow. Determine time in seconds for two revolu tions of gas through the meter. (Two revolutions assures a more accurate time.) Divide by two and compare to time in table 25 below. If manifold pressure matches table 28 and rate is incorrect, check gas orifices for proper size and restriction.

Page 56

Page 57

NOTE- To obtain accurate reading, shut off all other gas appliances connected to meter.

TABLE 25

GAS METER CLOCKING CHART

Seconds for One Revolution

EL296

Unit

Natural LP

1 cu ft

Dial

2 cu ft

Dial

1 cu ft

Dial

2 cu ft

DIAL

-045 80 160 200 400

-70 55 110 136 272

-90 41 82 102 204

-110 33 66 82 164

-135 27 54 68 136

Natural-1000 btu/cu ft LP-2500 btu/cu ft

Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking com bustion. See sections E- and F-. Take combustion sample beyond the flue outlet. Table 26 shows acceptable com bustions. The maximum carbon monoxide reading should not exceed 100 ppm.

TABLE 26

EL296

Unit

CO2%

For Nat

Low Fire High Fire Low Fire High Fire

CO2%

For L.P

045 5.6 - 6.6 7.8 - 8.8 6.6 - 7.6 9.1 - 10.1

070 5.5 - 6.5 7.3 - 8.3 6.5 - 7.5 8.6 - 9.6

090 5.9 - 6.9 7.8 - 8.8 6.9 - 7.9 9.1 - 10.1

110 6.3 - 7.3 8.2 - 9.2 7.3 - 8.3 9.5 - 10.5

The maximum carbon monoxide reading should not exceed 100ppm.

IMPORTANT

For safety, shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to replace pressure tap plug.

H- High Altitude

The manifold pressure, gas orifice and pressure switch may require adjustment or replacement to ensure proper operation at higher altitudes. See table 27 for gas conver sion and pressure switch kits. See table 28 for manifold

G- Proper Combustion

pressures

TABLE 27

LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes

EL296

Unit

-045

Natural to

LP/Propane

0 - 7500 ft

(0 - 2286m)

High Altitude

Natural Burner

Orifice Kit

7501 - 10,000 ft

(2286 - 3038m)

High Altitude

LP/Propane Burner

Orifice Kit

7501 - 10,000 ft (2286 - 3038m)

High Altitude Pressure Switch

4501 - 7500 ft

(1373 - 2286m)

7501 -10,000 ft

(2286 - 3048m)

14A57 14A50

-070 14A55 14A56

-090 14A54 14A53

*11K51 73W37 *11K46

-110 14A46 14A51

* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit. Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-1370 m).

TABLE 28

Manifold Pressure Settings

EL296

Unit

All Sizes

NOTE -

A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion

procedure.

Gas

Natural 1.7 3.5 4.5 10.5

LP/propane 4.9 10.0 11.0 13.0

Manifold Pressure in.wg. Supply Line Pressure in. w.g.

Low Fire High Fire Min Max

Page 57

Page 58

I- Proper Ground and Voltage

A poorly grounded furnace can contribute to premature ig nitor failure. Use the following procedure to check for ground and voltage to the integrated control. 1 - Measure the AC voltage between Line Neutral (spade

terminals) and “C” terminal (low voltage terminal block) on the integrated control. See figure 53. A wide variation in the voltage between Line Neutral and “C” as a function of load indicates a poor or partial ground. Compare the readings to the table below. If the read ings exceed the maximum shown in table 1, make re pairs before operating the furnace.

2 - In addition, measure the AC voltage from Line Hot to

Line Neutral (spade terminals) on the integrated con trol. See figure 53. This voltage should be in the range of 97 to 132 Vac

TABLE 29

Furnace Status

Power On Furnace Idle 0.3 2

CAI / Ignitor Energized 0.75 5

Indoor Blower Energized Less than 2 10

Measurement VAC

Expected Maximum

CHECK VOLTAGE BETWEEN LINE NEUTRAL

AND LOW VOLTAGE “C” TERMINAL

CHECK VOLTAGE BETWEEN LINE HOT

AND LINE NEUTRAL

W1 W2 GY2Y1

RDHLODS

FIGURE 53

Page 58

W1 W2 GY2Y1

RDHLODS

Page 59

V-TYPICAL OPERATING CHARACTERISTICS

A-Blower Operation and Adjustment

1 - Blower operation is dependent on thermostat control

system.

2 - Generally, blower operation is set at thermostat sub

base fan switch. With fan switch in ON position, blower operates continuously. With fan switch in AUTO position, blower cycles with demand or runs continuously while heating or cooling circuit cycles.

3 - Depending on the type of indoor thermostat, blower

and entire unit will be off when the system switch is in OFF position.

B-Temperature Rise (Figure 54)

Temperature rise for EL296DFV units depends on unit in put, blower speed, blower horsepower and static pressure as marked on the unit rating plate. The blower speed must be set for unit operation within the range of “TEMP. RISE °F” listed on the unit rating plate.

3 - With only the blower motor running and the evaporator

coil dry, observe the manometer reading. Adjust blow

er motor speed to deliver the air desired according to

the job requirements. For heating speed (second

stage heat speed) external static pressure drop must

not be more than 0.8” W.C. For cooling speed (second

stage cool speed) external static pressure drop must

not be more than 1.0” W.C.

4 - Seal the hole when the check is complete.

EXTERNAL STATIC PRESSURE

Supply Duct Static ________

Return Duct Static + _____

Total Duct Static = ________(dry coil)

Supply Air

TEMPERATURE RISE

Supply Duct Temperature ________

Return Duct Temperature

Temperature Rise = ________

FIGURE 54

C-External Static Pressure

1 - Tap locations shown in figure 55.

2 - Punch a 1/4” diameter hole in supply and return air ple

nums. Insert manometer hose flush with inside edge of hole or insulation. Seal around the hose with perma gum. Connect the zero end of the manometer to the discharge (supply) side of the system. On ducted sys tems, connect the other end of manometer to the return duct as above.

_____

SUPPLY

AIR

Temperatures

RETURN AIR

Duct Static

Return Air

FIGURE 55

VI-MAINTENANCE

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous opera tion, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace. When servicing controls, label all wires prior to dis connecting. Take care to reconnect wires correctly. Verify proper operation after servicing.

At the beginning of each heating season, system should be checked as follows by a qualified service technician:

Blower

Check the blower wheel for debris and clean if necessary. The blower motors are prelubricated for extended bearing life. No further lubrication is needed.

Page 59

Page 60

WARNING

The blower access panel must be securely in place when the blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal inju ry or death.

Filters

All air filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure proper furnace operation. Table 30 lists recommended filter sizes.

IMPORTANT

If a highefficiency filter is being installed as part of this system to ensure better indoor air quality, the fil ter must be properly sized. Highefficiency filters have a higher static pressure drop than standardef ficiency glass/foam filters. If the pressure drop is too great, system capacity and performance may be re duced. The pressure drop may also cause the limit to trip more frequently during the winter and the indoor coil to freeze in the summer, resulting 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 informa tion is provided in Service and Application Note ACC002 (August 2000).

TABLE 30

Furnace

Cabinet Width

17-1/2”

21”

Exhaust and air intake pipes

Check the exhaust and air intake pipes and all connections for tightness and to make sure there is no blockage.

NOTE - After any heavy snow, ice or frozen fog event the furnace vent pipes may become restricted. Always check the vent system and remove any snow or ice that may be obstructing the plastic intake or exhaust pipes.

Electrical

1 - Check all wiring for loose connections.

2 - Check for the correct voltage at the furnace (furnace

operating).

3 - Check amp-draw on the blower motor.

Motor Nameplate__________Actual__________

Winterizing and Condensate Trap Care

1 - Turn off power to the furnace.

2 - Have a shallow pan ready to empty condensate water.

Minimum Filter Size

16 x 25 x 1 (1)

3 - Remove the clean out cap from the condensate trap

and empty water. Inspect the trap then reinstall the clean out cap.

Condensate Hose Screen (Figure 56)

Check the condensate hose screen for blockage and clean

if necessary. 1 - Turn off power to the unit. 2 - Remove hose from cold end header box. Twist and pull

screen to remove. 3 - Inspect screen and rinse with tap water if needed. 4 - Reinstall screen and turn on power to unit.

Condensate Hose Screen

Hose

FIGURE 56

Cleaning Heat Exchanger

If cleaning the heat exchanger becomes necessary, follow the below procedures and refer to figure 1 when disassem bling unit. Use papers or protective covering in front of fur nace while removing heat exchanger assembly.

1 - Turn off electrical and gas supplies to the furnace. 2 - Remove the furnace access panels. 3 - Disconnect the wires from the gas valve. 4 - Remove gas supply line connected to gas valve. Re

move the burner box cover (if equipped) and remove gas valve/manifold assembly.

5 - Remove sensor wire from sensor. Disconnect 2‐pin

plug from the ignitor. 6 - Disconnect wires from flame roll-out switches. 7 - Loosen clamps at vent elbow. Disconnect condensate

drain tubing from flue collar. and remove the vent el

bow. 8 - Loosen clamps and remove combustion air intake

flexible connector if equipped. 9 - Remove four burner box screws at the vestibule panel

and remove burner box. Set burner box assembly

aside.

NOTE - If necessary, clean burners at this time. Follow

procedures outlined in Burner Cleaning section.

10 - Mark and disconnect all combustion air pressure tub

ing from cold end header collector box. 11 - Mark and remove wires from pressure switch assem

bly. Remove pressure switch assembly. Keep tubing

attached to pressure switch assembly. 12 - Disconnect the plug from the combustion air inducer.

Remove two screws which secure combustion air in

ducer to collector box. Remove combustion air induc

er assembly. Remove ground wire from vest panel. 13 - Remove electrical junction box from the side of the fur

nace.

Page 60

Page 61

14 - Disconnect condensate line from cold end header

box. Remove cold end header box.

15 - Loosen clamps on exhaust and air intake pipe seal

plate. Slide exhaust and intake pipes up and out to clear blower deck. Remove exhaust and air intake pipe seal plate.

16 - Mark and disconnect any remaining wiring to heating

compartment components. Disengage 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 which secure

vestibule panel and heat exchanger assembly to cabi

net. Remove two screws from blower rail which secure

top heat exchanger flange. Remove heat exchanger

from furnace cabinet. 20 - Back wash heat exchanger with soapy water solution

or steam. If steam is used it must be below 275°F

(135°C) .

21 - Thoroughly rinse and drain the heat exchanger. Soap

solutions can be corrosive. Take care to rinse entire

assembly. 22 - Reinstall heat exchanger into cabinet making sure that

the clamshells of the heat exchanger assembly are

engaged properly into the support bracket on the

blower deck. Remove the indoor blower to view this

area through the blower opening. 23 - Re‐secure the supporting screws along the vestibule

sides and top to the cabinet. 24 - Reinstall cabinet screws on front flange at blower

deck. 25 - Reinstall the primary limit on the vestibule panel. 26 - Route heating component wiring through hole in blow

er deck and reinsert strain relief bushing. 27 - Reinstall electrical junction box. 28 - Reinstall exhaust and air intake pipe seal plate. Rein

stall exhaust and air intake pipes and tighten clamps

on pipe seal plate. 29 - Reinstall the cold end header box. 30 - Reinstall the combustion air inducer. Reconnect the

combustion air inducer to the wire harness. 31 - Reinstall pressure switch assembly and reconnect

pressure switch wiring. 32 - Carefully connect combustion air pressure switch

tubing from pressure switches to proper ports on

cold end header collector box. 33 - Reinstall condensate trap. 34 - Secure burner box assembly to vestibule panel using

four existing screws. Make sure burners line up in

center of burner ports.

35 - Reconnect exhaust piping and exhaust drain tubing. 36 - Reconnect flame roll-out switch wires. 37 - Reconnect sensor wire and reconnect 2-pin plug from

ignitor.

38 - Reinstall gas valve manifold assembly. Reconnect

gas supply line to gas valve. 39 - Reinstall burner box cover if equipped. 40 - Reconnect plug to gas valve. 41 - Replace the blower compartment access panel. 42 - Follow lighting instructions on unit nameplate to light

and operate furnace for 5 minutes to ensure the fur

nace is operating properly. 43- Check all piping connections, factory and field, for gas

leaks. Use a leak detecting solution or other preferred means.

CAUTION

Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly af ter leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks.

44 - Replace access panel.

Cleaning the Burner Assembly (if needed)

1 - Turn off electrical and gas power supplies to furnace.

Remove upper and lower furnace access panels. 2 - Disconnect the 2-pin plug from the gas valve. 3 - Remove the burner box cover (if equipped). 4 - Disconnect the gas supply line from the gas valve. Re

move gas valve/manifold assembly. 5 - -Loosen clamps and remove combustion air intake

flexible connector (if equipped). 5 - Mark and disconnect sensor wire from the sensor. Dis

connect plug from the ignitor at the burner box. 6 - Remove four screws which secure burner box assem

bly to vest panel. 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 block

age caused by foreign matter. Remove any blockage. 8 - Reinstall the burner box assembly using the existing

four screws. Make sure that the burners line up in the

center of the burner ports. 9 - Reconnect the sensor wire and reconnect the 2-pin

plug to the ignitor wiring harness. 10 - Reinstall combustion air intake flexible connector (if

equipped), secure using existing clamps. 11 - Reinstall the gas valve manifold assembly. Reconnect

the gas supply line to the gas valve. Reinstall the burn

er box cover. 12 - Reconnect plug to gas valve. 13 - Replace the blower compartment access panel. 14 - Refer to instruction on verifying gas and electrical con

nections when re-establishing supplies. 15 - Follow lighting instructions to light and operate fur

nace for 5 minutes to ensure that heat exchanger is

clean and dry and that furnace is operating properly. 16 - Replace access panel.

Page 61

Page 62

VII- Wiring and Sequence of Operation

Page 62

Page 63

WARNING

Electric Shock Hazard. Can cause injury or death. Unit must be properly grounded in accordance with national and local codes.

WARNING

Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property dam age, severe injury or death. Use copper wire only with this product.

CAUTION

Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring and circuit breaker(s) per Product Specifications bulletin (EHB) and unit rating plate.

Electronic Ignition

The two-stage, variable speed integrated control used in EL296DFV units has an added feature of an internal Watch guard control. The feature serves as an automatic reset de vice for ignition control lockout caused by ignition failure. Af ter one hour of continuous thermostat demand for heat, the Watchguard will break and remake thermostat demand to the furnace and automatically reset the control to begin the ignition sequence.

NOTE - The ignition control thermostat selection DIP switch is factory-set in the “TWO-STAGE” position.

Applications Using a Two-Stage Thermostat

See figure 57 for ignition control sequence

A - Heating Sequence -- Integrated Control Thermostat Selection DIP Switch 1 OFF in “Two-Stage” Position (Factory Setting)

1. On a call for heat, thermostat first-stage contacts close sending a signal to the integrated control. The inte grated control runs a self‐diagnostic program and checks high temperature limit switches for normally closed contacts and pressure switches for normally open contacts. The combustion air inducer is ener gized at low speed.

2. Once the control receives a signal that the low pres sure switch has closed, the combustion air inducer be gins a 15-second pre-purge in low speed.

NOTE - If the low fire pressure 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..

3. After the pre-purge is complete, a 20-second initial ig nitor warm-up period begins. The combustion air in ducer continues to operate at low speed.

4 - After the 20-second warm-up period has ended, the gas

valve is energized on low fire (first stage) and ignition oc curs. At the same time, the control module sends a sig nal to begin an indoor blower 30-second ON-delay. When the delay ends, the indoor blower motor is ener gized on the low fire heating speed, the HUM contacts close energizing the humidifier and 120V ACC termi nal is energized. The furnace will continue this opera tion as long as the thermostat has a first-stage heating demand.

5 - If second-stage heat is required, the thermostat sec

ond-stage heat contacts close and send a signal to the integrated control. The integrated control initiates a 30-second second-stage recognition delay.

NOTE - If the indoor thermostat is set on CONTINU

OUS FAN ON mode, the furnace will light on high fire (second-stage) for 60 seconds to improve heat ex changer warm up. After 60 second warm-up period, furnace will switch to low fire (first-stage).

6 - At the end of the recognition delay, the integrated con

trol energizes the combustion air inducer at high speed. The control also checks the high fire (second stage) pressure switch to make sure it is closed. The high fire (second stage) gas valve is energized and the indoor blower motor is energized for operation at the high fire heating speed.

7 - When the demand for high fire (second stage) heat is

satisfied, the combustion air inducer is switched to the low-fire heating speed and the high-fire (second stage) gas valve is de-energized. The low-fire (first stage) gas valve continues operation. The indoor blower motor is switched to the low-fire heating speed.

8 - When the thermostat 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.

9 - When the combustion air post-purge period is com

plete, the inducer and the HUM contacts are de-ener gized. The indoor blower is de-energized at the end of the off delay as well as the 120V ACC terminal.

Page 63

Page 64

Applications Using A Single-Stage Thermostat

See figure 58 for ignition control sequence

B - Heating Sequence -- Integrated Control Thermostat Selection DIP Switch 1 ON in “Single-Stage” Position

NOTE - In these applications, two-stage heat will be initi ated by the integrated control if heating demand has not been satisfied after the field adjustable period (7 or 12 min utes).

2. Once the control receives a signal that the low pres sure switch has closed, the combustion air inducer be gins a 15-second pre-purge in low speed.

NOTE - If the low fire pressure 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.

3. After the pre-purge is complete, a 20-second initial ig nitor warm-up period begins. The combustion air in ducer continues to operate at low speed.

4 - After the 20-second warm-up period has ended, the gas

valve is energized on low fire (first stage) and ignition oc curs. At the same time, the control module sends a sig nal to begin an indoor blower 30-second ON-delay. When the delay ends, the indoor blower motor is ener gized on the low fire heating speed and the HUM con tacts are energized. The integrated control also initi ates a second-stage on delay (factory-set at 7 min utes; adjustable to 12 minutes).

5 - If the heating demand continues beyond the second-

stage on delay, the integrated control energizes the combustion air inducer at high speed. The control also checks the high fire (second stage) pressure switch to make sure it is closed. The high fire (second stage) gas valve is energized and the indoor blower motor is energized for operation at the high fire heating speed.

6 - When the thermostat heating demand is satisfied, the

combustion air inducer begins a 5-second low speed post-purge. The field-selected indoor blower off delay begins. The indoor blower operates at the low-fire heating speed.

7 - When the combustion air post-purge period is com

plete, the inducer and the HUM contacts are de-ener gized. The indoor blower is de-energized at the end of the off delay as well as the 120V ACC terminal.

OFF

1 stg heat demand

low speed CAI ignitor

low fire gas valve

indoor blower low heat

2 stg heat demand high speed CAI high fire gas valve

indoor blower high heat

* Conventional thermostat 30 seconds, icomfort Touch® thermostat set for 30 adjustable 15 to 45 seconds.

OFF

heat demand

low speed CAI ignitor

low fire gas valve

indoor blower low heat

HEATING OPERATION WITH TWO-STAGE THERMOSTAT

Pre-Purge

Ignitor Warm-up

Trial For Ignition

30 seconds

30* second

blower

“on” delay

RECOGNITION PERIOD

FIGURE 57

HEATING OPERATION WITH SINGLE STAGE THERMOSTAT

Pre-Purge

Ignitor Warm-up

351

Trial For Ignition

30* second

“on” delay

blower

5 SEC80

Post

Purge

5 SEC80

Post

Purge

blower

“off”

delay

blower

“off”

delay

7 or 12 minutes after heating demand begins, furnace switches to high fire (depending on setting)

high speed CAI high fire gas valve

indoor blower high heat

* Conventional thermostat 30 seconds, icomfort Touch® thermostat set for 30 adjustable 15 to 45 seconds.

FIGURE 58

Page 64

Page 65

icomfort Wi-Fi® Thermostat with EL296DFV

and Non-Communicating Outdoor Unit

icomfort Wi-Fi® Thermostat with EL296DFV

and icomfort-ENABLED Outdoor Unit

icomfort Wi-Fi® Thermostat icomfort-Enabled EL296DFV Indoor Furnace Non-Communicating Outdoor Air Conditioner

icomfort-

ENABLED

EL296DFV

OPTIONAL DISCHARGE AIR SENSOR

Icomfort Wi-Fi®

THERMOSTAT

CLIP ON-BOARD LINK W915 (Y1 TO Y2) FOR

TWO-STAGE OPERATION

FURNACE

NON-COMMUNICATING

OUTDOOR AIR

CONDITIONING UNIT -

1 OR 2 STAGE

OPTIONAL OUTDOOR

AIR SENSOR

icomfort Wi-Fi® Thermostat icomfort-Enabled EL296DFV Indoor Furnace icomfort-Enabled Outdoor Air Conditioner or Heat Pump

icomfortENABLED

EL296DFV

FURNACE

OPTIONAL

DISCHARGE

AIR SENSOR

OPTIONAL OUTDOOR

AIR SENSOR

icomfort Wi-Fi®

THERMOSTAT

icomfort- ENABLED

OUTDOOR AIR CONDITIONING

OR HEAT PUMP UNIT

Outdoor Unit

Indoor Unit Controller

Single wire to

Single wire to terminal C

terminal C

Unused wires

Communicating systems using the icomfort Wi-Fi® thermostat require four thermostat wires between the thermostat and the furnace/air handler control and four wires between the outdoor unit and the furnace/air handler control. When a thermostat cable with more than four wires is used, the extra wires must be properly connected to avoid electrical noise. The wires must not be left disconnected.

Use wire nuts to bundle the four unused wires at each end of the cable. A single wire should then be connected to the indoor unit end of the wire bundle and attached to the “C” terminals as shown above.

FIGURE 59

icomfort Wi-Fi

thermostat

Page 65

Page 66

Optional Accessories for use with any icomfort Touch® System

NOTE: icomfort Wi-Fi® THERMOSTAT SENSES HUMIDITY & CON TROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED.

OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDI FIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNC TIONS. BUILT INTO ALL icomfort by Lennox OUTDOOR UNITS).

120V CONNECTIONS

“HUM” CONTACT IS CLOSED ANYTIME HUMIDITY DEMAND IS PRESENT

icomfort ENABLED

Discharge Air Sen

sor (Required for

even heat)

icomfort Wi-Fi THERMOSTAT

EL296DFV FURNACE

RSBus

Maximum total length of all connec tions on the RSBus is limited to 1500ft.

Wire gauge of RSBus wire is 18.

icomfort  ENABLED OUTDOOR AIR CONDITIONING OR HEAT

PUMP UNIT

EL296DFV FURNACE

icomfort ENABLED

(POWER COMPANY INTERRUPTION SYSTEMS ARE WIRED SAME AS OVERFLOW SWITCH)

HEPA BYPASS FILTER X2680 HEPA INTERLOCK KIT

PASS INDOOR BLOWER MO TOR COMMON WIRE THROUGH CURRENT LOOP.

SEE HEPA INTERLOCK KIT FOR INSTALLATION DETAILS

EL296DFV FURNACE

icomfort ENABLED

LVCS VENTILATION CONTROL SYSTEM

SEE LVCS VENTILATION INSTRUCTIONS FOR DAMPER & SENSOR WIRING

NOTE: 24V UV LIGHT APPLICATIONS

In an icomfort by Lennox system, neither furnace nor air handler transformer will have adequate VA to power 24V UV light applications. An additional transformer for UV light applications is required.

icomfort Wi-Fi THERMOSTAT

HVAC EQUIPMENT

STANDARD 1 OR 2 STAGE

AC OR HP UNIT

2 STAGE FURNACE

24V HUMIDIFIER CONNECTIONS

CS 7000 THERMOSTAT

CONVENTIONAL NONCOMMUNICATING SYSTEM

COMMUNICATING SYSTEM

*24V IN jumper not used in noncommunicating configuration

*24V IN JUMPER

icomfort ENABLED EL296DFV FURNACE

DEHUMIDIFIER CONTROL

Rf WGhGsCf

HVAC EQUIP

NON-COMMUNICATING SYSTEM WIRING

EL296DFV FURNACE

icomfort ENABLED

Page 66

CUT R-DS W914

COMMUNICATING SYSTEM WIRING

Page 67

VIII- EL296DFV Field Wiring Applications With Conventional Thermostat

TABLE 29

DIP Switch Settings and On-Board Links (See figure 4)

Thermostat

1 Heat / 1 Cool

NOTE - Use DIP switch 2 to set second-stage heat ON delay. OFF-7 minutes. ON-12 minutes.

DIP Switch 1

Thermostat

Heating

Stages

On Board Links Must Be Cut To Select

System Options

DO NOT CUT ANY ON-BOARD LINKS

Wiring Connections

T'STAT

*Not required on all units

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.

1 Heat / 2 Cool with t'stat with humidity control

NOTE - Use DIP switch 2 to set second-stage heat ON delay. OFF-7 minutes. ON-12 minutes.

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

T'STAT

*Not required on all units

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

FURNACE

TERM. STRIP

OUTDOOR

UNIT

OUTDOOR

UNIT

Page 67

Page 68

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (See figure 4)

DIP Switch 1

Thermostat

Heating

Stages

2 Heat / 2 Cool OFF

TABLE 29

On Board Links Must Be Cut To Select

System Options

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

Wiring Connections

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

OUTDOOR

UNIT

2 Heat / 2 Cool with t'stat with humidity control

2 Heat / 1 Cool with t'stat with humidity control

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

T'STAT

*Not required on all units

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

FURNACE

TERM. STRIP

OUTDOOR

UNIT

OUTDOOR

UNIT

2 Heat / 1 Cool OFF

DO NOT CUT ANY ON-BOARD LINKS

Page 68

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

OUTDOOR

UNIT

Page 69

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense 7000 L7724U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control

TABLE 29

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 4)

DIP Switch 1

Thermostat

Heating

On Board Links Must Be Cut To Select

System Options

Wiring Connections

Stages

FURNACE

TERM. STRIP

OFF

CUT ON-BOARD LINK

W951 HEAT

PUMP

L7724U T'STAT

HEAT PUMP

67M41*

Dual Fuel Two Stage Heat Pump

ComfortSense

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

L7724U T'STAT

FURNACE

TERM. STRIP

HEAT PUMP

67M41*

7000 L7724U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat

CUT ON-BOARD LINK

W951 HEAT

PUMP

control

outdoor sensor

* Connect W1 to W1 ONLY if using defrost tempering kit 67M41

NOTE - Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the EL296 integrated control.

outdoor

sensor

out blue

Page 69

Page 70

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense 7000 L7724U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control w/dehu midification control

TABLE 29

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 4)

DIP Switch 1

Thermostat

Heating

On Board Links Must Be Cut To Select

System Options

Wiring Connections

Stages

FURNACE

TERM. STRIP

OFF

CUT ON-BOARD LINK

W951 HEAT

PUMP

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

L7724U T'STAT

HEAT PUMP

67M41*

Dual Fuel Two Stage Heat Pump

ComfortSense 7000 L7724U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control w/dehu midification

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W951 HEAT

PUMP

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

L7724U T'STAT

FURNACE

TERM. STRIP

HEAT PUMP

67M41*

out blue

* Connect W1 to W1 ONLY if using defrost tempering kit 67M41

NOTE - Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the EL296 integrated control.

outdoor

sensor

outdoor

sensor

Page 70

Page 71

IX- Program Unit Capacity Size Modes

Power-Up - Number displayed represents by integrated control unit size code (furnace model

and capacity). If three horizontal bars are displayed followed by continuous E203, furnace control does not recognize unit size code. Configure per the following:

Yes

To enter Program Unit Capacity/Size: push and hold button next to 7-segment LED display until solid “P” symbol appears. Release button.

IMPORTANT: Field replacement controls may need to be manually configured to validate furnace unit size code.

Solid P starts blinking on 7-Segment LED

Furnace control in IDLE mode

No heating, cooling or indoor fan

operation)

UNIT SIZE

CODE

FURNACE MODEL

EL296UH045V36B

EL296UH070V36B

EL296UH090V36B

EL296UH09048C

EL296UH090V60C

EL296UH110V48C

EL296UH110V60C

EL296UH135V60D

−

Turn room thermostat to OFF

UNIT SIZE

CODE

FURNACE MODEL

EL296DF0450V36A

EL296DF070V48B

EL296DF090V60C

EL296DF110V60C

Push and hold button. Integrated control will display unit size code number for each furnace model for three seconds.

When the correct unit size code is displayed, release button. Selected code will flash for 10-second period. During that period, press and hold push button for 5 seconds. Integrated 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 automatically exit Program Capacity/Size Mode and go into IDLE mode without storing unit size code. If this happens, programming function must be repeated).

−

. If

−

Verify that the selected unit size code is correct and stored in non-volatile memory by cycling the 24 volt power to the furnace control. (At 24 volt power-up of the furnace control, the 7-segment LED will display a unit size code three horizontal bars display, board does not recognize unit size code function must be repeated)

. Programming

FINISHED

Page 71

Page 72

X- Troubleshooting

Troubleshooting: Heating Sequence of Operation

CALL FOR FIRST-STAGE HEAT

CALL FOR

1ST STAGE HEAT

(LOW FIRE)

LIMIT SWITCH

PRESSURE

INDUCER ON

LOW SPEED

PRESSURE SWITCH

CLOSED WITHIN 120

SECONDS?

PRE−PURGE

(15 SECONDS)

H.S.I. ON

(20 SECONDS)

1ST STAGE GAS

VALVE ENERGIZED

IGNITION TRIAL

BEGINS (H.S.I. ON)

HIGH

CLOSED?

YES

ROLLOUT CIRCUITS

CLOSED?

YES

LOW

SWITCH

OPEN?

YES

LOW

YES

HEAT FAN ON DELAY

TIMER STARTED

INDOOR BLOWER OFF AFTER

HEAT FAN OFF DELAY

(LOW HEAT SPEED)

ERROR

CODE

FLASHES

DE−ENERGIZE

GAS VALVE

ERROR CODE

FLASHES (AFTER

5 SECONDS)

LOW PRESSURE SWITCH OPENS

HIGH

PRESSURE

SWITCH

OPEN

BEFORE

INDUCER WAS

TURNED ON?

INDOOR BLOWER

ON(LOW HEAT

SPEED)

INDUCER ON

(HIGH SPEED)

INDOOR BLOWER ON (LOW HEAT

SPEED)

INTERPURGE

(15 SECONDS)

YES

LIMIT

SWITCH

CLOSED WITHIN 3

MINUTES?

ERROR

CODE

FLASHES

INDUCER TO

HIGH SPEED−

ERROR CODE

FLASHES

BLOWER OFF

AFTER HEAT FAN

OFF DELAY (LOW

ROLLOUT

CIRCUIT CLOSES

(MANUAL

RE−SET)

INDOOR BLOWER OFF AFTER HEAT OFF DELAY

HARD LOCKOUT − ERROR CODE FLASHES

LOW & HIGH

PRESSURE SWITCH

CLOSED WITHIN 30

SECONDS?

INDOOR

HEAT SPEED)

INDUCER OFF

AFTER POST

PURGE

YES

WATCHGUARD − ERROR CODE FLASHES

YES

INDUCER OFF−

WAIT

5 MINUTES

ERROR CODE

FLASHES

CALL

FOR HEAT

ENDS?

YES

INDOOR

BLOWER

ON?

YES

INDOOR

BLOWER

OFF AFTER

HEAT FAN

OFF DELAY

FLAME

SENSED WITHIN

4 SECONDS?

YES

H.S.I. OFF

INDOOR

BLOWER ON 30 SEC.

(LOW HEAT SPEED)

CALL FOR HEAT SATISFIED

GAS VALVE

DE−ENERGIZED

H.S.I. OFF

WATCHGUARD LOCKOUT AUTOMATICALLY RESETS AFTER ONE HOUR

HARD LOCKOUT REQUIRES THERMOSTAT RESET OR CYCLING OF POWER TO RESET THE LOCKOUT.

IN CASE HIGH SPEED INDUCER IS RUNNING AT THE TIME THE GAS VALVE GETS ENERGIZED,

2ND STAGE GAS VALVE IS ENERGIZED INSTEAD OF 1ST STAGE. 20 SECONDS AFTER FLAME IS SENSED, INDUCER SWITCHES TO LOW SPEED, AND GAS VALVE SWITCHES TO 1ST STAGE.

5TH

UNSUCCESSFUL

TRIAL?

POSTPURGE

YES

(5 SECONDS)

Page 72

INDUCER

OFF

WATCHGUARD − ERROR CODE FLASHES

Page 73

Troubleshooting: Heating Sequence of Operation (Continued)

CALL FOR SECOND-STAGE HEAT

2 STAGE THERMOSTAT

RECOGNITION DELAY

ONLY FOR 1ST

REQUEST FOR

2ND STAGE HEAT

CALL FOR 2ND STAGE HEAT

(30 SECONDS)

EXPIRED?

(HIGH FIRE)

YES

INDUCER SWITCHED

TO HIGH SPEED

HIGH

PRESSURE SWITCH

CLOSED WITHIN 10

SECONDS?

YES

2ND STAGE GAS VALVE

ENERGIZED

INDOOR BLOWER ENERGIZED

ON HIGH HEAT SPEED

SINGLE STAGE

THERMOSTAT

2ND STAGE

ON DELAY

EXPIRED?

YES

INDUCER SWITCHED

TO LOW SPEED

5 MINUTE DELAY

(ERROR CODE FLASHES)

CALL FOR HEAT SATISFIED

SYSTEM WILL ALWAYS LIGHT ON LOW FIIRE, EVEN IF 2ND STAGE HEAT IS IN PLACE.

WHEN USED WITH A SINGLE STAGE THERMOSTAT, SET SW1 TO THE ON POSITION IN DIP SWITCH S4.

IF THE HIGH FIRE PRESSURE SWITCH DOES NOT CLOSE WITHIN 5 ATTEMPTS, THE SYSTEM WILL OPERATE AT LOW FIRE FOR THE REMAINDER OF THE CALL FOR HEAT REQUEST.

Page 73

Page 74

Troubleshooting: Heating Sequence of Operation (Continued)

CALL FOR HEAT SATISFIED

FIRST-STAGE HEAT SECOND-STAGE HEAT

2 3

RUN MODE: 1ST OR 2ND STAGE CALL FOR HEAT.

ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT/COOL, FLAME LEVEL)

2ND STAGE HEAT

2ND STAGE

CALL FOR HEAT

SATISFIED?

YES

DE−ENERGIZE 2ND STAGE

GAS VALVE

INDUCER SPEED SWITCHED

TO LOW SPEED

INDOOR BLOWER SWITCHED

TO LOW HEAT SPEED

1ST STAGE HEAT

1ST STAGE

CALL FOR HEAT

SATISFIED?

YES

GAS VALVE

DE−ENERGIZED

INDUCER OFF AFTER

5 SECOND POST PURGE

INDOOR BLOWER OFF

AFTER FIELD SELECTABLE

OFF DELAY

Page 74

Page 75

Troubleshooting: Cooling Sequence of Operation (Continued)

CALL FOR COOLING

1ST STAGE COOLING REQUEST RECEIVED

WAIT FOR COMPRESSOR TIMED

OFF DELAY TO EXPIRE

ENERGIZE 1ST STAGE COOLING CONTACTOR (COMPRESSOR & FAN)

INDOOR BLOWER 2 SECOND ON DELAY

ENERGIZE INDOOR BLOWER

(LOW COOLING MODE)

2ND STAGE

COOLING

REQUEST?

YES

ENERGIZE 2ND STAGE COOLING CONTACTOR (COMPRESSOR & FAN)

2ND STAGE

COOLING REQUEST

STILL ACTIVE?

MAINTAIN INDOOR

BLOWER

(LOW COOLING MODE)

YES

ENERGIZE INDOOR BLOWER

(HIGH COOLING MODE)

MAINTAIN INDOOR BLOWER

YES

1ST STAGE

COOLING REQUEST

STILL ACTIVE?

(HIGH COOLING MODE)

DE−ENERGIZE 2ND

STAGE COOLING

CONTACTOR

(COMPRESSOR & FAN)

1ST STAGE

COOLING REQUEST

STILL ACTIVE?

DE−ENERGIZE 1ST

STAGE COOLING

CONTACTOR

(COMPRESSOR & FAN)

DE−ENERGIZE INDOOR

BLOWER

YES

ENERGIZE AND MAINTAIN

INDOOR BLOWER AT

(LOW COOLING MODE)

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

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 CONROL.

Page 75

Page 76

Troubleshooting: Continuous Fan Sequence of Operation

CALL FOR FAN

INDOOR BLOWER ON

CONTINUOUS FAN

SPEED

CALL FOR FAN

REMOVED?

YES

REQUEST

FOR COOLING

RECEIVED?

REQUEST

FOR HEAT

RECEIVED?

DE-ENERGIZE INDOOR

BLOWER

YES

MAINTAIN INDOOR

BLOWER AT

CONTINUOUS FAN

MAINTAIN INDOOR

BLOWER AT

CONTINUOUS FAN

MAINTAIN INDOOR

BLOWER AT

CONTINUOUS FAN

GO TO CALL FOR COOLING

GO TO CALL FOR 1ST STAGE HEAT

1 - If continuous fan is active, unit will light and run at high fire

for 60 seconds to improve heat exchanger warm up.

Page 76

Lennox EL296DF045XV36B, EL296DF110XV60C, EL296DF070XV48B, EL296DF090XV60C Unit Information

Specifications and Main Features

Frequently Asked Questions

User Manual

SPECIFICATIONS

Integrated Control Diagnostic Modes

DIP Switch Settings

BLOWER DATA