Lennox EL195DF User Manual

Page 1

Corp. 1102−L1

Service Literature

Revised 02/2012

EL195DF SERIES UNITS

EL195DF series units are high−efficiency gas furnaces manufactured with Lennox DuralokPlust aluminized steel clamshell−type heat exchangers, with a stainless steel condensing coil. EL195DF units are available in heating input capacities of 44,000 to 110,000 Btuh (13 to 32.2 kW) and cooling applications from 2 through 5 tons (7.0 through

17.6 kW). Refer to Engineering Handbook for proper sizing.

Units are factory equipped for use with natural gas. A kit is available for conversion to LP/Propane operation. All EL195DF units are equipped with a hot surface ignition system. The gas valve is redundant to assure safety shut−off as required by C.S.A.

The heat exchanger, burners and manifold assembly can be removed for inspection and service. The maintenance section gives a detailed description on how this is done.

All specifications are subject to change. Procedures outlined in this manual are presented as a recommendation only and do not supersede or replace local or state codes.

EL195DF

WARNING

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

Table of Contents

Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional Accessories 3. . . . . . . . . . . . . . . . . . . . . . . . . .

Blower Performance Data 4. . . . . . . . . . . . . . . . . . . . . .

I−Unit Components 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

II Placement and Installation 16. . . . . . . . . . . . . . . . . . . .

III−Start−Up 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IV−Heating System Service Checks 37. . . . . . . . . . . . . .

V−Typical Operating Conditions 40. . . . . . . . . . . . . . . . . .

VI−Maintenance 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VII−Wiring and Sequence of Operation 43. . . . . . . . . . . .

VIII−Troubleshooting 44. . . . . . . . . . . . . . . . . . . . . . . . . . .

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), service agency or the gas supplier.

WARNING

Sharp edges. Be careful when servicing unit to avoid sharp edges which may result in personal injury.

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Litho U.S.A.

Page 2

SPECIFICATIONS

Gas Heating Performance

Connections in.

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

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 Blower

Model No. EL195DF045P36B EL195DF070P48B EL195DF090P60C EL195DF110P60C

AFUE 95% 95% 95% 95%

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

Output - Btuh 42,000 64,000 85,000 106,000

Temperature rise range - °F 25 - 55 25 - 55 30 - 60 40 - 70

Gas Manifold Pressure (in. w.g.)

3.5 / 10 3.5 / 10 3.5 / 10 3.5 / 10

Nat. Gas / LPG/Propane

High static - in. w.g. 0.5 0.5 0.5 0.5

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

Gas pipe size IPS 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

Wheel nom. dia. x width - in. 10 x 8 11-1/2 x 10 11-1/2 x 10 11-1/2 x 10

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

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

Air Volume Range - cfm 605-1615 1090-1885 1270-2305 1330-2375

Electrical Data

Blower motor full load amps 6.1 10.0 11.5 11.5

Voltage 120 volts - 60 hertz - 1 phase

Maximum overcurrent protection 12 12 15 15

Shipping Data lbs. - 1 package 121 134 154 164

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

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

furnaces.

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Page 3

OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA

“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 51W18 51W18

CONTROLS

DOWNFLOW FILTER KITS

Downow Air Filter and Rack Kit 51W07 51W08

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

NIGHT SERVICE KITS

Night Service Kit 51W03 51W03

Safety Service Kit 89W20 89W20

TERMINATION KITS

See Installation Instructions for specic venting information.

Termination Kits Direct Vent Applications

Only

Termination Kits - Direct or Non-Direct vent

Roof Termination Flashing Kit - Direct or Non-Direct Vent (2 ashings)

Cleanable polyurethane frame type lter.

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

Non-direct vent only.

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

Concentric US - 2 in. 71M80 69M29

3 in. - - - 60L46

Canada - 2 in. 44W92 44W92

3 in. - - - 44W93

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

Wall - Close

Couple

Wall - Close

Couple WTK

US - 2 in. 22G44 - - -

3 in. 44J40 44J40

Canada - 2 in. 30G28 - - -

3 in. 81J20 81J20

Roof 2 in. 15F75 15F75

Wall Ring Kit 2 in. 15F74

15F74

2 in. 44J41 44J41

GAS HEAT ACCESSORIES

High Altitude

Input

045 No Change 74W90 69W73 73W81 73W37 68W68

070 77W43 73W22 69W73 73W81 73W37 68W68

090 77W43 73W22 69W73 73W81 73W37 68W68

110 77W43 73W22 69W73 73W81 73W37 68W68

Pressure Switch Kit

4501 - 7500 ft. 7501 - 10,000 ft. 0 - 7500 ft. 0 - 7500 ft. 7501- 10,000 ft. 7501- 10,000 ft.

Natural Gas to

LPG/Propane Kit

Page 3

LPG/Propane

to Natural Gas Kit

Natural Gas

High Altitude

Orice Kit

LPG/Propane

High Altitude

Orice Kit

Page 4

BLOWER DATA

EL195DF045P36B PERFORMANCE (Less Filter)

External

Static

Pressure

in. w.g.

0.00 1615 650 1385 555 1205 465 1045 390

0.10 1605 640 1380 545 1195 455 1035 380

0.20 1500 620 1345 525 1165 445 1015 370

0.30 1450 590 1290 490 1125 420 975 365

0.40 1350 560 1235 480 1090 405 920 345

0.50 1300 545 1170 450 1035 380 880 330

0.60 1195 500 1095 425 990 365 840 320

0.70 1140 480 1020 395 895 345 780 300

0.80 1025 450 920 370 840 330 695 270

0.90 945 430 800 335 700 290 605 250

EL195DF070P48B PERFORMANCE (Less Filter)

External

Static

Pressure

in. w.g.

0.00 1885 935 1830 815 1810 720 1700 640

0.10 1850 910 1805 795 1785 705 1680 630

0.20 1775 890 1750 775 1710 690 1620 610

0.30 1715 870 1685 755 1640 660 1575 595

0.40 1645 855 1620 735 1595 650 1495 575

0.50 1575 835 1525 715 1485 625 1440 555

0.60 1505 815 1450 690 1425 610 1360 540

0.70 1390 790 1360 675 1340 590 1270 525

0.80 1280 770 1270 650 1255 570 1210 505

0.90 1200 740 1185 635 1160 550 1090 485

Air Volume / Watts at Various Blower Speeds

High

cfm Watts cfm Watts cfm Watts cfm Watts

Air Volume / Watts at Various Blower Speeds

High

cfm Watts cfm Watts cfm Watts cfm Watts

Medium-

High

Medium-

High

Medium-

Low

Medium-

Low

EL195DF090P60C PERFORMANCE (Less Filter)

External

Static

Pressure

in. w.g.

0.00 2305 1255 2145 950 1900 810 1515 670

0.10 2295 1240 2135 940 1885 795 1500 665

0.20 2200 1220 2085 915 1865 775 1525 655

0.30 2160 1210 1990 875 1830 755 1545 640

0.40 2055 1170 1935 865 1790 725 1530 620

0.50 1970 1130 1855 835 1705 700 1500 600

0.60 1890 1105 1765 805 1635 675 1495 580

0.70 1775 1075 1680 785 1565 655 1430 560

0.80 1690 1050 1590 760 1485 630 1370 540

0.90 1580 1010 1485 735 1405 610 1270 510

EL195DF110P60C PERFORMANCE (Less Filter)

External

Static

Pressure

in. w.g.

0.00 2375 1250 2205 915 1975 785 1630 640

0.10 2365 1235 2195 905 1960 775 1625 635

0.20 2275 1200 2125 890 1950 760 1635 625

0.30 2200 1180 2060 880 1900 735 1620 610

0.40 2115 1150 1995 850 1845 710 1620 600

0.50 2040 1115 1940 835 1795 695 1585 580

0.60 1955 1090 1855 810 1745 670 1540 565

0.70 1860 1070 1730 765 1640 650 1515 550

0.80 1735 1030 1620 740 1590 620 1415 535

0.90 1640 1010 1535 715 1480 600 1330 510

Air Volume / Watts at Various Blower Speeds

High

cfm Watts cfm Watts cfm Watts cfm Watts

Air Volume / Watts at Various Blower Speeds

High

cfm Watts cfm Watts cfm Watts cfm Watts

Medium-

High

Medium-

High

Medium-

Low

Medium-

Low

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Page 5

CONTROL BOX

(Includes integrated control,

transformer and door switch)

PARTS ARRANGEMENT

BLOWER 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

COLD END HEADER BOX

PRIMARY LIMIT

BLOWER DECK

DuralokPlus

HEAT EXCHANGER

ASSEMBLY

FIGURE 1

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Page 6

I−UNIT COMPONENTS

3. Integrated Ignition Control (A92)

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

CAUTION

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

EL195DF unit components are shown in figure 1. The combustion air inducer, gas valve and burners can be accessed by removing the burner access panel. The blower and control box can be accessed by removing the blower access door.

A−Control Box Components (Figure 2)

Unit transformer (T1) and integrated ignition control (A92) are located in the control box. In addition, a door interlock switch (S51) is located in the control box.

EL195DF Control Box

WARNING

Shock hazard. Disconnect power before servicing. Control is not

field repairable. If control is inoperable, simply replace entire control.

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

The ignition control system consists of an integrated control (figure 4) ignitor (figure 5) and flame sensor (figure 5). The integrated control and ignitor work in combination to ensure furnace ignition and ignitor durability. The integrated control, controls all major furnace operations. The integrated control also features a RED LED light for troubleshooting and two accessory terminals rated at (1) one amp. Tables 1 and 2 show jack plug terminal designations. See table 3 for troubleshooting diagnostic codes. The nitride ignitor is made from a non−porous, high strength proprietary ceramic material that provides long life and trouble free maintenance. The integrated control continuously monitors line voltage and maintains the ignitor power at a consistent level to provide proper lighting and maximum ignitor life.

TRANSFORMER

(T1)

DOOR INTERLOCK

SWITCH (S51)

INTEGRATED IGNITION

CONTROL

(A92)

FIGURE 2

1. Transformer (T1)

A transformer located in the control box provides power to the low voltage section of the unit. The transformers on all models are rated at 40VA with a 120V primary and 24V secondary.

2. Door Interlock Switch (S51)

A door interlock switch rated 14A at 120VAC is located on the control box. The switch is wired in series with line voltage. When the blower door is removed the unit will shut down.

TABLE 1

4−Pin Terminal Designation

PIN # FUNCTION

1 Combustion Air Inducer Line

Ignitor Line

Combustion Air Inducer Neutral

Ignitor Neutral

TABLE 2

12−Pin Terminal Designations

PIN # FUNCTION

1 High Limit Output

2 Not Used

3 24V Line

4 Not Used

5 Rollout Switch Out

6 24V Neutral

7 High Limit Input

8 Ground

9 Gas Valve Common

10 Pressure Switch In

11 Rollout Switch In

12 Gas Valve Out

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Page 7

Electronic Ignition

On a call for heat the integrated control monitors the combustion air inducer prove switch. The integrated control will not begin the heating cycle if the pressure switch is closed (by−passed). Once the pressure switch is determined to be open, the combustion air inducer is energized. When the differential in the pressure switch is great enough, the pressure switch closes and a 15−second pre−purge begins. If the pressure switch is not proven within 2−1/2 minutes, the integrated control goes into Watchguard−Pressure Switch mode for a 5−minute re−set period. After the 15−second pre−purge period, the ignitor warms up for 20 seconds during which the gas valve opens at 19 seconds for a 4−second trial for ignition. The ignitor remains energized for the first 3 seconds during the 4 second trial. If ignition is not proved during the 4−second period, the integrated 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 (including the initial trial), the integrated control goes into Watchguard−Flame Failure mode. After a 60−minute reset period, the integrated control will begin the ignition sequence again. The integrated control has an added feature of ignitor power regulation to maintain consistent lighting and longer ignitor life under all line voltage conditions.

Fan Control

Heating Fan On Delay

The heating fan on time of 30 seconds is not adjustable.

Heating Fan Off Delay

The heat fan off delay (amount of time that the blower operates after the heat demand has been satisfied) may be adjusted by changing the jumper position across the five pins on the integrated control. The unit is shipped with a factory fan off setting of 90 seconds. The fan off delay affects comfort and is adjustable to satisfy individual applications. Adjust the fan off delay to achieve a supply air temperature between 90° and 110°F at the moment that the blower is de−energized. Longer off delay settings provide lower return air temperatures; shorter settings provide higher return air temperatures. See figure 3.

Cooling Fan On Delay

The cool fan on delay is 2 seconds and not adjustable.

Cooling Fan Off Delay

The cool fan off delay (amount of time that the blower operates after the cool demand has been satisfied) is 45 seconds and not adjustable.

HEAT FAN-OFF TIME IN SECONDS

NO JUMPER

To adjust fan−off timing, reposition jumper across pins to

60 Second

off Time

120

180

achieve desired setting.

90 Second

off Time

120

180

120 Second

off Time

120

180

FIGURE 3

INTEGRATED CONTROL

(Automatic Hot Surface Ignition System)

Red LED

HUM LINE XFMR EAC COOL HEAT PARK FLAME FAN HUM Humidifier (24VAC)

Recall

Blower off delay

jumper

TERMINAL DESIGNATIONS

Humidifier (120VAC) Input (120VAC) Transformer (120VAC) Indoor Air Quality Accessories (120VAC) Blower − Cooling Speed (120VAC) Blower − Heating Speed (120VAC) Dead terminals to park alternate speed taps Flame sensor Continuous blower

180 Second

off Time

120

180

FIGURE 4

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Page 8

TABLE 3

RED LED

Flash Code

Diagnostic Codes / Status of Furnace

Off No power to control or board fault detected.

ON Board Fault Detected.

Heartbeat

Control powered − displayed during all modes of operation if no errors are detected.

Reverse Line Voltage.

Corrective Action − Check the 120V line and neutral connections and reverse the connection if necessary.

Improper Earth Ground. Corrective Action − Check for proper unit ground and install if necessary.

Burner failed to light, or lost flame during heat demand.

Corrective Action − Check condition of flame sensor and clean if necessary using steel wool. Check flame sensor signal and replace if necessary. Check flame sensor wiring and replace if necessary.

Low Flame Signal.

Corrective Action − Check flame sensor micro amp reading. Normal reading is 1.5. Replace sensor if lower than 0.5.

5 Watchguard − burner failed to light, exceeded maximum number of retries or recycles.

6 Ignitor Circuit Failure − not available on this control.

Primary or Secondary Limit Open or Watchguard Mode − Limit Switch Open longer than 3 minutes.

Corrective Action Check for restriction on blower inlet air and outlet air. Remove restrictions. Check unit rate, rise and static. Make adjustments if necessary and run unit until equilarium. Check continuity across switch and replace if necessary.

Rollout Switch Open.

Corrective Action − Check continuity across switch and replace switch if necessary. Check for restriction in vent pipe, combustion air inlet and heat exchanger. Determine cause of restriction before placing furnace back inoperation.

Pressure Switch failed to close or opened during heat demand.

Corrective Action − Check the differential in the pressure switch. See figure 11. Check for restricted vent pipe and remove all blockage. Check vent pipe sizing. See table 10.

Watchguard − Pressure Switch opened 5 times during one heat demand.

Corrective Action − Check for restricted vent pipe and remove all blockage. Check the condensate line for proper drainage and correct as necessary. Check for proper vent termination and replace if necessary. See table 8.

Pressure Switch stuck closed prior to activation of combustion air inducer.

Corrective Action − Check that the pressure switch is open without the combustion air inducer operating. Replace switch if defective.

Flame Sensed without gas valve energized. Corrective Action − Check that the gas valve is stuck open. Replace gas valve.

Low Line Voltage.

Corrective Action − Check line voltage to unit. Voltage should be 120V + 10%. Contact power company if necessary.

Notes

Note 1 A "Heartbeat" is indicated by a "Slow Flash" − 1 sec on 1 sec off, repeating

Note

Error codes are indicated by a "Rapid Flash" − the LED flashes X times at 1/2 sec on 1/2 sec off, remains off for 3 sec, then repeats

Last 10 error codes are stored in memory including when power is shut off to the unit. − To recall,

Note

press and release button, most recent will be displayed first, LED off for 3 sec, then next error code is displayed, etc. To clear error codes, depress and hold button longer than 5 seconds.

Page 8

Page 9

EL195DF Burner Box Assembly

SENSOR

IGNITOR

BURNERS

ROLLOUT SWITCHES

FRONT BURNER BOX PLATE

GAS VALVE

FIGURE 5

B−Heating Components

Combustion air inducer (B6), primary limit control (S10), SureLight ignitor, burners, flame rollout switch (S47), gas valve (GV1), combustion air prove switch (S18), and clamshell heat exchangers are located in the heating compartment. The heating compartment can be accessed by removing the burner access panel.

1. Flame Rollout Switches (Figure 5)

Flame rollout switches S47 are SPST N.C. high temperature limits located on the top left and bottom right of the front buner box plate. S47 is wired to the burner ignition control A92. When either of the switches sense flame rollout (indicating a blockage in the combustion passages), the flame rollout switch trips, and the ignition control immediately closes the gas valve. Switch S47 in all EL195DF units is factory preset to open at 210_F + 12_F (99_C + 6.7_C) on a temperature rise. All flame rollout switches are manual reset.

2. Heat Exchanger (Figure 6)

EL195DF units use an aluminized steel primary and stainless steel secondary heat exchanger assembly. Heat is transferred to the air stream from all surfaces of the heat exchanger. The shape of the heat exchanger ensures maximum efficiency.

The combustion air inducer pulls fresh air through the burner box. This air is mixed with gas in the burners. The gas / air mixture is then burned at the entrance of each clamshell . Combustion gases are then pulled through the primary and secondary heat exchangers and exhausted out the exhaust vent pipe.

3. Primary Limit Control (Figure 6)

Primary limit (S10) used on EL195DF units is located in the heating vestibule panel. When excess heat is sensed in the heat exchanger, the limit will open. Once the limit opens, the furnace control energizes the supply air blower and de−energizes the gas valve. The limit automatically resets when unit temperature returns to normal. The switch is factory set and cannot be adjusted. For limit replacement remove wires from limit terminals and rotate limit switch 90 degrees. Slowly remove from the vestibule panel. Install replacement limit with same care.

Page 9

Page 10

Primary Limit Location and Heat Exchanger

Install limit face down

FIGURE 6

4. Gas Valve (GV1)

The EL195DF uses an internally redundant to valve to assure safety shut-off. If the gas valve must be replaced, the same type valve must be used. 24VAC terminals and gas control switch are located on top of the valve. All terminals on the gas valve are connected to wires from the ignition control. 24V applied to the terminals opens the valve. Inlet and outlet pressure taps are located on the valve. A manifold adjustment screw is also located on the valve. An LP/Propane changeover kit is available.

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

(under barbed

fitting)

Gas Valve

MANIFOLD

PRESSURE

OUTLET

PORT

5. Flame Sensor (Figure 5)

A flame sensor is located on the left side of the burner support. The sensor is mounted on the bottom burner box plate and the tip protrudes into the flame envelope of the left− most burner. The sensor can be removed for service without removing any part of the burners. During operation, flame is sensed by current passed through the flame and sensing electrode. The ignition control allows the gas valve to remain open as long as flame signal is sensed.

NOTE − The EL195DF is polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

A microamp DC meter is needed to check the flame signal on the integrated control.

Flame (microamp) signal is an electrical current which passes from the integrated control to the sensor during unit operation. Current passes from the sensor through the flame to ground to complete a safety circuit.

To Measure Flame Signal − Integrated Control:

Use a digital readout meter capable of reading DC microamps. S ee figur e 8 for flame signal check.

1 − Set the meter to the DC amps scale. 2 − Turn off supply voltage to control. 3 − Disconnect integrated control flame sensor wire from

the flame sensor. 4 − Connect (−) lead to flame sensor. 5 − Connect (+) lead to the ignition control sensor wire. 6 − Turn supply voltage on and close thermostat contacts to

cycle system. 7 − When main burners are in operation for two minutes, take

reading.

6. Ignitor (Figure 5)

EL195DF units use a mini−nitride ignitor made from a proprietary ceramic material. To check ignitor, measure its resistance and voltage. A value of 39 to 70 ohms indicates a good ignitor. Voltage to the ignitor should be 102VAC − 132VAC. See figure 9 for resistance and voltage checks.

INLET

PRESSURE

PORT

FIGURE 7

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Page 11

Flame Signal In Microamps

Normal Low Drop Out

 1.5 0.5 − 1.4  0.4

(+)

Measuring Flame Signal

Flame Sensor

Terminal

Intergrated

Control

Remove Sensor Wire from

Intergrated Control and

Connect Alligator Clip (−)

to Frame Sensor Lead

Remove Sensor Wire from

Intergrated Control and

Connect Alligator Clip (+)

to Terminal on Control

Flame Sensor

Wire

(+) To Control

Sensor T erminal

Multi−Meter

Set Dial to DC MicroAmps

(+)

(−) To Flame

Terminal

Red Collar Indicates

FIGURE 8

Page 11

Page 12

Multi−Meter (set to ohms)

Check ignitor circuit for correct resistance.

Test 1

Remove 4−pin plug from control.

Check ohms reading across terminals 2 and 4.

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.

Multi−Meter (set to ohms)

Test 2

Check ignitor for correct resistance.

Seperate the 2−pin jack−plug near the manifold

and check 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.

Integrated Control Detail

Multi−Meter (set to VAC)

Test 3

Check ignitor for correct voltage

Insert meter probes into terminals 2 and 4 (use small

diameter probes in order not to damage plug).

Check voltage during 20 second ignitor warm up period.

Voltage should read 120 volts + 10%. If voltage reads below

these values, check for correct supply voltage to furnace.

Integrated Control Detail

FIGURE 9

Page 12

Page 13

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

All EL195DF units use a combustion air inducer to move air through the burners and heat exchanger during heating operation. The blower uses a shaded pole 120VAC motor. The motor operates during all heating operation and is controlled by burner ignition control A3. Blower operates continuously while there is a call for heat. The burner ignition control will not proceed with the ignition sequence until combustion air inducer operation is sensed by the proving switches.

The CAI is installed on the cold end header box. The cold end header box is a single piece made of hard plastic. The box has an internal channel where the combustion air inducer creates negative pressure at unit start up. The channel contains an orifice used to regulate flow created by the CAI. The box has pressure taps for the CAI pressure switch hoses. The pressure switch measure the pressure across the CAI orifice or difference in the channel and the box. If replacement is necessary the gas-

kets used to seal the box to the vestibule panel and the CAI to the box, must also be replaced.

TABLE 4

EL195DF Unit C.A.I. Orifice Size

−045 0.618"

−070 0.810"

−090 0.973"

−110 1.040"

8. Combustion Air Pressure Switch (Figure 10)

EL195DF series units are equipped with a differential pressure switch located on the cold end header box. The switches monitor across the CAI orifice to insure proper flow through the heat exchanger.

The switch is a SPST N.O. prove switch electrically connected to the integrated control. The purpose of the switch is to prevent burner operation if the combustion air inducer is not moving enough air for proper combustion.

Pressure Switch

BRACKET

24VAC

TERMINALS

TAP

FIGURE 10

On start-up, the switch senses that the combustion air inducer is operating. It closes a circuit to the ignition control when the difference in pressure across the CAI orifice exceeds a non−adjustable factory setting. If the sw itc h does not successfully sense the required differential, the switch cannot close and the furnace cannot operate. If the flue or air inlet bec ome obstructed during operation, the switch senses a loss of pressure differential and opens the circuit to the ignition control. If the condensate line is blocked, water will back up into the header box and reduce the pressure differential across the switch. The prove switch opens if the differential drops below the set point. See table 5. Checks of pressure differential can aid in troubleshooting. When measuring the pressure differential, readings should be taken at the pressure switch. See figure 11 and table 6. Lack of differential usually indicates problems in the intake or exhaust piping, but may in dic ate problems in the heat exchanger, condensing coil, header boxes, combustion inducer or other components.

TABLE 5

Altitude ft

EL195

Unit

0 − 4500 4501 − 7500 7501 − 10000

Set Point SetPoint Set Point

−045

−070

−090

−110

−0.65 −0.65 −0.60

−0.90 −0.85 −0.65

−0.90 −0.80 −0.65

*Set point is factory set and non−adjustable

Page 13

Page 14

Measuring Pressure Differential

Red Tubing

(negative −)

To Cold End Header Box

1 − Remove thermostat demand and allow unit to

cycle off.

2 − Install a tee in the negative (−) line (red tubing) and a

tee in the positive (+) line (black tubing) running from the pressure switch to the cold end header box.

3 − Install a manometer with hose from the negative (−)

side of the manometer to the tee installed in the negative (−) line and with hose from the positive (+) side of the manometer to the tee in the positive (+) line.

NOTE − Both sides of the cold end header box are negative. However the (+) port reads less negative pressure than the (−) port.

Black Tubing

(positive +)

To Cold End Header Box

Field Provided Tubing

To Pressure Switch

+"

High

−"

Low

4 − 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 pressure differential.

The pressure differential should be greater than those listed in table 5.

5 − Remove thermostat demand and allow to cycle off.

6 − Remove manometer and tee’s. Reinstall combustion

air sensing hoses to the pressure switch.

FIGURE 11

C−Blower Compartment

Blower motor (B3) and capacitor (C4), are located in the blower compartment. The blower compartment can be accessed by removing the blower access panel.

Blower Motor Housing

BOLTS

MOTOR

CAPACITOR

To Remove Blower From Unit: Disconnect Power, Remove Control Box, Remove Bolts and Unplug Motor Wires From

Integrated Control. Then Slide Out Front of Unit.

FIGURE 12

1.Blower Motor (B3) and Capacitor (C4)

All EL195DF units use single−phase direct−drive blower motors. All motors are 120V permanent split capacitor motors to ensure maximum efficiency. See SPECIFICATIONS table at the front of this manual for more detail. See motor nameplate for capacitor ratings.

Page 14

Page 15

TABLE 6

Pressure Switch Troubleshooting Guide

Problem Corrective Action

Check that the pressure switch is open without the combustion air inducer operat-

Pressure switch stuck closed

ing. Replace if defective.

Pressure switch does not close due to obstruction in vent pipe.

Pressure switch does not close due to incorrect routing of the pressure switch tubing.

Pressure switch does not close due to obstructions in the pressure switch line.

Check for restricted vent. Remove all blockage. Check for proper vent sizing. See table 10.

Check that the pressure switch tubing is correctly routed. Correctly route pressure witch line.

Remove any obstructions from the the pressure switch line and/or taps

Pressure switch tubing damaged. Check pressure switch tubing for leaks. Replace damaged tubing if necessary.

Condensate in pressure switch tubing. Check pressure switch tubing for condensate. Remove condensate from tubing.

Pressure switch does not close due to a low differential pressure across the pressure switch.

Wrong pressure switch installed in the unit, or pressure switch is out of calibration

Miswiring of furnace or improper connections at pressure switch.

Pressure switch failure.

Check the differential pressure across the pressure switch. Check for restricted inlet vent. Remove all blockage. Check for proper vent sizing and run length. See table 10.

Check that the correct pressure switch is installed in the unit. Replace pressure switch if necessary.

Check for correct wiring and loose connections. Correct wiring and/or replace any loose connections.

If all the above modes of failure have been checked, the pressure switch may have failed. Replace pressure switch and determine if unit will operate.

Damaged condensate trap. Check trap for any cracks or damage and replace if necessary.

Cold end header box does not drain properly.

Air leakage around the combustion air inducer gasket.

Air leakage around the cold end header box gasket.

Check that the furnace is set properly with a slight tilt (0 − 1/2") towards the front if necessary. See furnace installation instruction.

Check gasket and replace if necessary.

Damaged cold end header box tubing. Check tubing and replace if necessary.

Page 15

Page 16

II−PLACEMENT AND INSTALLATION

Combustion, Dilution & Ventilation Air

If the EL195DF is installed as a Non−Direct Vent Furnace, follow the guidelines in this section.

NOTE − In Non−Direct Vent installations, combustion air is taken from indoors and flue gases are discharged out− doors.

In the past, there was no problem in bringing in sufficient outdoor air for combustion. Infiltration provided all the air that was needed. In today’s homes, tight construction practices make it necessary to bring in air from outside for combustion. Take into account that exhaust fans, appliance vents, chimneys, and fireplaces force additional air that could be used for combustion out of the house. Unless outside air is brought into the house for combustion, negative pressure (outside pressure is greater than inside pressure) will build to the point that a downdraft can occur in the furnace vent pipe or chimney. As a result, combustion gases enter the living space creating a potentially dangerous situation.

In the absence of local codes concerning air for combus− tion and ventilation, use the guidelines and procedures in this section to install EL195DF furnaces to ensure efficient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas piping. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSI− Z223.1/NFPA 54). This reprinted material is not the complete and official position of the ANSI on the referenced subject, which is represented only by the standard in its entirety.

In Canada, refer to the CSA B149 installation codes.

CAUTION

Do not install the furnace in a corrosive or contaminated atmosphere. Meet all combustion and ventilation air requirements, as well as all local codes.

All gas-fired appliances require air for the combustion process. If sufficient combustion air is not available, the furnace or other appliance will operate inefficiently and unsafely. Enough air must be provided to meet the needs of all fuel−burning appliances and appliances such as exhaust fans which force air out of the house. When fireplaces, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is required to ensure proper combustion and to prevent a downdraft. Insufficient air causes incomplete combustion which can result in carbon monoxide.

In addition to providing combustion air, fresh outdoor air dilutes contaminants in the indoor air. These contaminants may include bleaches, adhesives, detergents, solvents and other contaminants which can corrode furnace components.

The requirements for providing air for combustion and ventilation depend largely on whether the furnace is installed in an unconfined or a confined space.

Unconfined Space

An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not separated by a door. Though an area may appear to be unconfined, it might be necessary to bring in outdoor air for combustion if the structure does not provide enough air by infiltration. If the furnace is located in a building of tight construction with weather stripping and caulking around the windows and doors, follow the procedures in the Air from Outside section.

Confined Space

A confined space is an area with a volume less than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the com− bined input rating of all appliances installed in that space. This definition includes furnace closets or small equipment rooms.

When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room. Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure condition. Air for combustion and ventilation can be brought into the confined space either from inside the building or from outside.

Air from Inside

If the confined space that houses the furnace adjoins a space categorized as unconfined, air can be brought in by providing two permanent openings between the two spaces. Each opening must have a minimum free area of 1 square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of total input rating of all gas−fired equipment in the confined space. Each opening must be at least 100 square inches (64516 mm2). One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. See figure 13.

Page 16

Page 17

EQUIPMENT IN CONFINED SPACE − ALL AIR FROM INSIDE

ROOF TERMINATED

EXHAUST PIPE

OPENINGS

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE − Each opening shall have a free area of at least one square inch per 1,000 Btu (645 mm all equipment in the enclosure, but not less than 100 square inches (64516 mm.

2).

ML193UH

per .29 kW) per hour of the total input rating of

(To Adjacent

Unconfined

Space)

FIGURE 13

Air from Outside

If air from outside is brought in for combustion and ventilation, the confined space shall be provided with two permanent openings. One opening shall be within 12" (305mm) of the top of the enclosure and one within 12" (305mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch per 4,000 Btu (645mm per 1.17kW) per hour of total input rating of all equipment in the enclosure. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 Btu (645mm per .59kW) per total input rating of all equipment in the enclosure (See figure 14).

If air from outside is brought in for combustion and ventilation, the confined space must have two permanent openings. One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of total input rating of all equipment in the enclosure. See figures 14 and 15. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch (645 mm2) per 2,000 Btu (.56 kW) per total input rating of all equipment in the enclosure. See figure 16.

When ducts are used, they shall be of the same cross−sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. If the design and free area of protective covering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 percent free area and metal louvers and grilles will have 60 to 75 percent free area. Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation.

EQUIPMENT IN CONFINED SPACE − ALL AIR FROM OUTSIDE

(All Air Through Ventilated Attic)

ROOF TERMINATED

EXHAUST PIPE

OUTLET

AIR

VENTILATION LOUVERS

(Each end of attic)

EQUIPMENT IN CONFINED SPACE − ALL AIR FROM OUTSIDE

(Inlet Air from Crawl Space and Outlet Air to Ventilated Attic)

ROOF TERMINATED

EXHAUST PIPE

OUTLET

AIR

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

FURNACE

INLET

AIR

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.

FIGURE 14

VENTILATION LOUVERS

(Each end of attic)

VENTILATION

LOUVERS

(For unheated

crawl space)

per 1.17kW) per

Page 17

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

FURNACE

NOTE−The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm

INLET AIR

(Ends 12" above

bottom)

per 1.17kW) per hour

of the total input rating of all equipment in the enclosure.

FIGURE 15

Page 18

EQUIPMENT IN CONFINED SPACE −

ALL AIR FROM OUTSIDE

ROOF TERMINATED

EXHAUST PIPE

OUTLET AIR

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE−Each air duct opening shall have a free area of at least one square inch per 2,000 Btu (645mm input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings communicate directly with the outdoors, each opening shall have a free area of at least 1 square inch per 4,000 Btu (645mm hour of the total input rating of all other equipment in the enclosure.

FURNACE

INLET AIR

per .59kW) per hour of the total

per 1.17kW) per

FIGURE 16

Pipe & Fittings Specifications

All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) standards. The solvent shall be free flowing and contain no lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, stratification, or separation that cannot be removed by stirring. Refer to the table 7 below for approved piping and fitting materials.

CAUTION

Solvent cements for plastic pipe are flammable liquids 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 cement with skin and eyes.

PIPING AND FITTINGS SPECIFICATIONS

TABLE 7

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

D2661

D2665

ASTM

SPECIFICATION

D2564, D2235, F493

D3138

MARKING

ULCS636

IMPORTANT

EL195DF 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 7. As an alternate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either 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 inside 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 appliance must be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent (exhaust) system. In addition, the first three feet of vent pipe from the furnace flue collar must be accessible for inspection.

Page 18

Page 19

Vent

Input Size

Pipe

Dia. in.

045

2−1/2

070

2−1/2

090

2−1/2

2 YES YES YES

110

2−1/2 YES YES

3 YES YES

135 3 YES

OUTDOOR TERMINATION USAGE

TABLE 8

STANDARD KITS CONCENTRIC KITS

FlushMount

Kit

51W11

YES YES

YES YES YES

2 inch 3 inch 2 inch

22G44 (US)

30G28 (CA)

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

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.

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 kit 51W11 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 11 for vent accelerator requirements.

Page 19

Page 20

Joint Cementing Procedure

Venting Practices

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 applied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe.

NOTE − Time is critical at this stage. Do not allow primer 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 during assembly (but not after pipe is fully inserted) to distribute cement evenly. DO NOT turn ABS or cellular core pipe.

NOTE − Assembly should be completed within 20 seconds 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 indicate an improper assembly due to insufficient solvent.

9 − Handle joints carefully until completely set.

Piping Suspension Guidelines

SCHEDULE 40

PVC − 5’

all other pipe* − 3’

* See table 7 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

Wall

FIGURE 17

REPLACING FURNACE THAT

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

FURNACE

(Replaced by EL193)

If an EL195DF 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 products, 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.

WAS PART OF A COMMON

VENT SYSTEM

WATER

HEATER

OPENINGS

(To Adjacent

Room)

FIGURE 18

2. 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.

Page 20

Page 21

3. 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 condensate collection trap and lines.

Exhaust Piping (Figures 20 and 21)

Route piping to outside of structure. Continue with installation following instructions given in piping termination section.

Use the following steps to correctly size vent pipe diameter.

Piping Size Process

What is the

furnace capacity?

045, 070, 090,

110 or 135?

CAUTION

Do not discharge exhaust into an existing stack or stack that also serves another gas appliance. If vertical discharge through an existing unused stack is required, insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack.

CAUTION

The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.

Vent Piping Guidelines

The EL195DF 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 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 9 and 10. Count all elbows inside and outside the home. Table 9 lists the minimum vent pipe lengths per- mitted. Table 10 lists the maximum pipe lengths permitted.

MINIMUM VENT PIPE LENGTHS

EL195DF

MODEL

045, 070, 090, 110

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

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 11.

In some applications which permit the use of several different sizes of vent pipe, a combination vent pipe may be used. Contact Lennox’ Application Department for assistance in sizing vent pipe in these applications.

TABLE 9

MIN. VENT LENGTH*

15 ft. or

5 ft plus 2 elbows or

10 ft plus 1 elbow

Which style termination

NOTE − It is acceptable to use any pipe size which fits within the guidelines allowed in table 10.

NOTE − All horizontal runs of exhaust pipe must slope back toward unit. A minimum of 1/4" (6mm) drop for each 12" (305mm) of horizontal run is mandatory for drainage.

being used?

Standard or concentric?

See table 8.

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?

Use table 10 to find max intake or exhaust pipe length. Includes all vent pipe and elbows inside and outside the house.

FIGURE 19

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 − 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.

Page 21

Page 22

Maximum Allowable Intake or Exhaust Vent Length

TABLE 10

NOTE − 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 81 66 44 24 115 11 5 93 58 138 137 118 118 2 76 61 39 19 110 11 0 88 53 133 132 113 113 3 71 56 34 14 105 105 83 48 128 127 108 108 4 66 51 29 n/a 100 100 78 43 123 122 103 103 5 61 46 24 n/a 95 95 73 38 118 117 98 98 6 56 41 19 n/a 90 90 68 33 113 112 93 93 7 51 36 14 n/a 85 85 63 28 108 107 88 88 8 46 31 n/a n/a 80 80 58 23 103 102 83 83 9 41 26 n/a n/a 75 75 53 18 98 97 78 78

10 36 21 n/a n/a 70 70 48 13 93 92 73 73

Number Of

90° Elbows

Used

1 81 66 44 n/a 115 115 93 58 138 137 11 8 118 2 76 61 39 n/a 110 11 0 88 53 133 132 113 11 3 3 71 56 34 n/a 105 105 83 48 128 127 108 108 4 66 51 29 n/a 100 100 78 43 123 122 103 103 5 61 46 24 n/a 95 95 73 38 118 117 98 98 6 56 41 19 n/a 90 90 68 33 113 112 93 93 7 51 36 14 n/a 85 85 63 28 108 107 88 88 8 46 31 n/a n/a 80 80 58 23 103 102 83 83 9 41 26 n/a n/a 75 75 53 18 98 97 78 78

10 36 21 n/a n/a 70 70 48 13 93 92 73 73

045 070 090 11 0 045 070 090 110 045 070 090 110

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 73 58 42 22 105 105 89 54 121 121 114 114 2 68 53 37 17 100 100 84 49 116 116 109 109 3 63 48 32 12 95 95 79 44 111 111 104 104 4 58 43 27 5 53 38 22 85 85 69 34 101 101 94 94 6 48 33 17 80 80 64 29 96 96 89 89 7 43 28 12 75 75 59 24 91 91 84 84 8 38 23 9 33 18 65 65 49 14 81 81 74 74

10 28 13 60 60 44 n/a 76 76 69 69

Number Of 90°

Elbows Used

1 73 58 42 2 68 53 37 100 100 84 49 11 6 116 109 109 3 63 48 32 95 95 79 44 111 111 104 104 4 58 43 27 90 90 74 39 106 106 99 99 5 53 38 22 85 85 69 34 101 101 94 94 6 48 33 17 80 80 64 29 96 96 89 89 7 43 28 12 75 75 59 24 91 91 84 84 8 38 23 9 33 18 65 65 49 14 81 81 74 74

10 28 13 60 60 44 n/a 76 76 69 69

045 070 090 110 045 070 090 11 0 045 070 090 110

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

90 90 74 39 106 106 99 99

n/a

70 70 54 19 86 86 79 79

n/a

Concentric Termination Elevation 4501 − 10,000 ft

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

105 105 89 54 121 121 11 4 114

n/a

70 70 54 19 86 86 79 79

n/a

Page 22

Page 23

TYPICAL EXHAUST PIPE CONNECTIONS

Pipe size determined in table 10.

*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 20

INTAKE

EXHAUST

TOP VIEW

Pipe size determined in table 10.

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 21

EXHAUST

TOP VIEW

Page 23

Page 24

Intake Piping

The EL195DF 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 to secure the intake pipe to the inlet air

connector.

2 − Route piping to outside of structure. Continue with

installation following instructions given in general guide lines for piping terminations and intake and exhaust piping terminations for direct vent sections. Refer to table 10 for pipe sizes.

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 22

Follow the next two steps when installing the unit in NonDirect 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 22. 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 outdoors. The EL195DF 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 outdoors. The EL195DF 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 23 or 24. In addition, position termination so it is free from any obstructions and 12" above the average snow accumulation.

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 a condensing unit because the condensate can damage the painted coating.

NOTE − If winter design temperature is below 32°F (0°C), exhaust piping should be insulated with 1/2" (13mm), Armaflex or equivalent when run through unheated space. Do not leave any surface area of exhaust pipe open to outside air; exterior exhaust pipe should be insulated with 1/2" (13mm) Armaflex or equivalent. In extreme cold climate areas, 3/4" (19mm) Armaflex or equivalent may be necessary. Insulation on outside runs of exhaust pipe must be painted or wrapped to protect insulation from deterioration. Exhaust pipe insulation may not be necessary in some specific applications. NOTE − During extremely cold temperatures, below approximately 20°F (6.7°C), units with long runs of vent pipe through unconditioned space, even when insulated, may form ice in the exhaust termination that prevents the unit from operating properly. Longer run times of at least 5 minutes will alleviate most icing problems. Also, a heating cable may be installed on exhaust piping and termination to prevent freeze−ups. Heating cable installation kit is available from Lennox. See Condensate Piping section for part numbers.

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 24

Page 25

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

D =

Vertical clearance to ventilated soffit

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 =

I =

J =

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

Clearance to service regulator

vent outlet

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

M =

Clearance under veranda, porch, deck or balcony

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 23

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 installation instructions."

Page 25

Page 26

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

D =

Vertical clearance to ventilated soffit

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 =

L =

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.

Clearance to mechanical air sup-

ply inlet

Clearance above paved sidewalk or

paved driveway located on public property

Clearance under veranda, porch, deck or balcony

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

(3m) horizontally

* 7 feet (2.1m)

*12 inches (305mm)

FIGURE 24

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 26

Page 27

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

NOTE − In Direct Vent installations, combustion air is taken from outdoors and flue gases are discharged to outdoors.

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 material, 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 27.

Intake and 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 preferred. Figures 25 through 37 show typical terminations.

1. Exhaust and intake exits must be in same pressure zone. Do not exit one through the roof and one on the side. Also, do not exit the intake on one side and the exhaust on another side of the house or structure.

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

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

25).

4. Exhaust piping must terminate straight out or up as shown. A reducer may be required on the exhaust piping at the point where it exits the structure to improve the velocity of exhaust away from the intake piping. See table 11.

TABLE 11

EXHAUST PIPE TERMINATION SIZE REDUCTION

EL195

MODEL

*045 and *070

*090 2" (51mm)

110 2" (51mm)

*EL195DF−045, −070 and −090 units with the flush−mount termination must use the 1−1/2"accelerator supplied with the kit.

Exhaust Pipe Size

2" (51mm), 2−1/2" (64mm),

3" (76mm)

Termination

Pipe Size

1−1/2" (38mm)

5. On field−supplied terminations for side wall exit, exhaust 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 figures 28 and 29.

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 figures 28 and 29.

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 11.

UNCONDITIONED

ATTIC SPACE

1/2" (13mm) FOAM

INSULATION IN

UNCONDITIONED

SPACE

FIGURE 25

2" EXTENSION FOR 2" PVC PIPE 1" EXTENSION FOR 3" PVC PIPE

4’’

FURNACE

INTAKE

PIPE

FLUSH−MOUNT SIDE WALL TERMINATION KIT 51W11

FURNACE

EXHAUST

PIPE

GLUE EXHAUST

END FLUSH INTO

TERMINATION

1−1/2" ACCELERATOR

(all −045, −070 and −090 units)

FIGURE 26

7. If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported every 24" (610mm) as shown in figures 28 and 29. In addition, close coupled wall termination kits must be extended for use in this application. See figures 35 and 36. When exhaust and intake piping must be run up an outside wall, the exhaust piping must be terminated with pipe sized per table 11.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 32.

Page 27

Page 28

Intake

Exhaust

Front View of

Intake and Exhaust

Intake

Exhaust

TABLE

12"

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)

2" (51mm)

Vent Pipe

12" (305MM) Min.

6" (152MM) Min.

24" (610 MM) Max

9" (227MM) Min.

12" (305MM) Min. 16" (405 MM) Max.

6" (152MM) Max.

3" (76mm)

Vent Pipe

12" (305MM) Min.

6" (152MM) Min.

24" (610 MM) Max

9" (227MM) Min.

12" (305MM) Min. 20" (508MM) Max.

6" (152MM) Max.

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

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.

NOTE − See unit installation instructions for proper exhaust pipe termination size reduction.

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

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

FIGURE 27

Page 28

Page 29

FIELD FABRICATED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

FIELD FABRICATED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

With INTAKE ELBOW

NOTE − FIELD PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

TO TERMINATION

1/2" (13mm) ARMAFLEX INSULATION

* WALL

SUPPORT

1/2" (13mm) ARMAFLEX

INSULATION IN UN-

CONDITIONED SPACE

SIZE TERMINATION

PER TABLE 11

IN UNCONDITIONED SPACE

APPPLICATION

STRAIGHT

EXTENDED

APPLICATION

NOTE − FIELD PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

TO TERMINATION

1/2" (13mm) ARMAFLEX INSULATION

* WALL

SUPPORT

1/2" (13mm) ARMAFLEX

INSULATION IN UN-

CONDITIONED SPACE

SIZE TERMINATION

PER TABLE 11

IN UNCONDITIONED SPACE

APPPLICATION

STRAIGHT

EXTENDED

APPLICATION

See venting table 10 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 6" (152 mm) from top of each pipe (intake and exhaust)

A−Minimum clearance

above grade or average

snow accumulation

B−Maximum horizontal separation between

intake and exhaust

C−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)

2" (51mm)

Vent Pipe

12" (305MM) 12" (305MM)

6" (152MM) 6" (152MM)

8" (203MM) 8" (203MM)

12" (305MM) 20" (508MM)

6" (152MM) 6" (152MM)

3" (76mm)

Vent Pipe

FIGURE 28

See venting table 10 for maximum venting lengths with this arrangement.

A−Minimum clearance

above grade or average

snow accumulation

B−Maximum horizontal

separation between

intake and exhaust

C−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)

2" (51mm)

Vent Pipe

12" (305MM) 12" (305MM)

6" (152MM) 6" (152MM)

6" (152MM)

12" (305MM) 20" (508MM)

6" (152MM) 6" (152MM)

3" (76mm)

Vent Pipe

6" (152MM)

FIGURE 29

Page 29

Page 30

12” (305mm)

Minimum

Above Average

Snow

Accumulation

CLAMP

1−1/2" (38mm) accelerator

provided on 71M80 & 44W92

kits for EL195DF045P36B− &

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

Front View

INTAKE

AIR

Top View

1/2" (13mm) Foam Insulation

in Unconditioned Space

FIELD−PROVIDED

REDUCER MAY

BE REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE

TO TERMINATION

EXHAUST VENT

SIZE

TERMINATION

PIPE PER TABLE 11.

EXHAUST VENT

INTAKE AIR

6 (152mm) MIN.

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

FIGURE 30

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

EL195DF045P36B− &

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 31

EXHAUST

VENT

INTAKE

AIR

Inches (mm)

(127mm)

18" MAX. (457mm)

EXHAUST VENT

INTAKE

AIR

12"

(305mm)

5−1/2"

(140mm)

Front View

12" (305mm) Min.

above grade or

average snow ac-

cumulation.

AIR

DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

Front View

INTAKE

AIR

Top View

1/2" (13mm) Foam Insulation

in Unconditioned Space

FIELD−PROVIDED

REDUCER MAY

BE REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE

TO TERMINATION

DIRECT VENT WALL TERMINATION KIT

(22G44 or 44J40)

FIGURE 33

FIGURE 34

OUTSIDE WALL

EXHAUST VENT

SIZE

TERMINATION

PIPE PER TABLE 11.

EXHAUST VENT

INTAKE AIR

8" (206mm) MIN.

OUTSIDE WALL

optional intake elbow

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(22G44, 44J40, 30G28 or 81J20)

FIGURE 32

Page 30

Page 31

WALL TERMINATION KITS (CLOSE−COUPLE)

EXTENDED VENT FOR GRADE CLEARANCE

If intake and exhaust pipe is less than 12 in. (305 mm) above snow accumulation or other obstructions, field− fabricated piping must be installed.

8” (203 mm) Min. for 2” (51 mm) & 3” (76 mm) DIA. pipe

WALL SUPPORT*

6” (152 mm)

Maximum

INTAKE

AIR

between the end of the exhaust pipe and intake pipe 12” (305 mm) Max. for 2” (51 mm) Dia. Exhaust 20” (508 mm) Max. for 3” (76 mm) Dia. Exhaust

8” (203 mm) Min.

12” (305 mm) Max. for 2” (51 mm) Dia. Exhaust 20” (508 mm) Max. for 3” (76 mm) Dia. Exhaust

2 inch (51 mm) 22G44 (US)

3 inch (76 mm) 44J40 (US)

EXHAUST

AIR

INTAKE

5” (127 mm)

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

GRADE

*Use wall support every 24" (610). Use two supports if

extension is greater than 24" but less than 48".

AIR

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

FIELD−PROVIDED

12”

(305 mm)

1/2” (13 mm)

FOAM INSULATION

(Field Furnished)

EXHAUST

AIR

12” (305 mm) Minimum

5−1/2”

(140 mm)

Above Grade or Average

Snow Accumulation

GRADE

WALL TERMINATION KITS (CLOSE−COUPLE)

EXTENDED VENT FOR GRADE CLEARANCE

See Installation Instructions for additional information.

If intake and exhaust pipe is less than 12 in. (305 mm) above snow accumulation or other obstructions, field− fabricated piping must be installed.

WALL SUPPORT*

6” (152 mm)

Maximum

INTAKE

AIR

12” (305 mm) Max. for 2” (51 mm) Dia. Exhaust 20” (508 mm) Max. for 3” (76 mm) Dia. Exhaust

6” (152 mm)

Minimum

6” (152 mm)

Minimum

FIGURE 35

2 inch (51 mm) 30G28 (WTK Canada) 3 inch (76 mm) 81J20 (WTK Canada)

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

EXHAUST

AIR

INTAKE

AIR

5” (127 mm)

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

GRADE

FIELD−PROVIDED

12”

(305 mm)

5−1/2”

(140 mm)

1/2” (13 mm)

FOAM INSULATION

(Field Furnished)

EXHAUST

AIR

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

GRADE

12” (305 mm) Max. for 2” (51 mm) Dia. Exhaust 20” (508 mm) Max. for 3” (76 mm) Dia. Exhaust

FIGURE 36

Page 31

*Use wall support every 24" (610). Use two supports if

extension is greater than 24" but less than 48".

Page 32

EL195DF DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

8" − 12"

(203mm − 305mm)

(76mm− 203mm)

ANGLE−CUT IN DIRECTION

3" − 8"

STRAIGHT−CUT OR

OF ROOF SLOPE *

EXHAUST VENT

1/2" (13mm)

WEATHERPROOF

INSULATION

12" (305mm)

ABOVE AVE.

SNOW

ACCUMULATION

1/2" (13mm) FOAM

INSULATION

SIZE TERMINATION

PIPE PER TABLE

11.

Minimum 12" (305MM)

above chimney top

plate or average snow

accumulation

*SIZE TERMINATION PIPE PER TABLE 11.

NOTE − Do not discharge exhaust gases directly into any chimney or vent stack. If vertical 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 illustrated. In any exterior portion of chimney, the exhaust vent must be insulated.

INTAKE PIPE

INSULATION (optional)

SHEET

METAL TOP

PLATE

INSULATE TO FORM

SEAL

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

3" − 8"

(76mm−

203mm)

ALTERNATE

INTAKE PIPE

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 37

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 preferred. Figures 38 through 41 show typical terminations.

1. Exhaust piping must terminate straight out or up as shown. The termination pipe must be sized as listed in table 11.The specified pipe size ensures proper velocity required to move the exhaust gases away from the building.

2. On field supplied terminations for side wall exit, exhaust piping may extend a maximum of 12 inches (305mm) for 2" PVC and 20 inches (508mm) for 3" (76mm) PVC beyond the outside wall. See figure 39.

3" (76mm) OR

2" (51mm) PVC

PROVIDE SUPPORT

FOR EXHAUST LINES

UNCONDITIONED

ATTIC SPACE

NON−DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 38

12" (305mm) MAX. for 2" (51mm)

1/2" (13mm) ARMAFLEX

INSULATION IN

UNCONDITIONED SPACE

FIELD−PROVIDED

REDUCER MAY

BE REQUIRED TO

ADAPT LARGER VENT PIPE SIZE

TO TERMINATION

SIZE TERMINATION

PIPE PER TABLE 11.

20" (508mm) MAX. for 3" (76mm)

1/2" (13mm)

ARMAFLEX

INSULATION

PVC REDUCER

12" MIN. (305mm)

Above Grade or

average snow

accumulation

NON−DIRECT VENT FIELD SUPPLIED WALL TERMINATION OR

(15F74) WALL TERMINATION KIT

FIGURE 39

3. If exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported every 24 inches (610mm) as shown in figure 40. When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow.

Page 32

Page 33

12" (305mm) MAX. for 2" (51mm)

UNCONDITIONED

SPACE

6" (152mm)

Max

*WALL SUPPORT

OUTSIDE WALL

FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE TO

TERMINATION

1/2" (13mm) FOAM

INSULATION IN

UNCONDITIONED

SPACE

*Use wall support every 24" (610). Use

two supports if extension is greater

than 24" but less than 48".

NON−DIRECT VENT FIELD SUPPLIED WALL TERMINATION EX-

TENDED OR (15F74) WALL TERMINATION VENT PIPE EXTENDED

20" (508mm) MAX. for 3" (76mm)

SIZE TERMINATION

PIPE PER

TABLE 11.

12" (305mm)

ABOVE GRADE OR

AVERAGE SNOW ACCUMULATION

1/2" (13mm) FOAM

INSULATION

FIGURE 40

EL195DF NON−DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

SIZE TERMINATION

PIPE PER TABLE 11.

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" (76mm− 203mm)

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 41

Condensate Piping

This unit is designed for either right- or left-side exit of condensate piping. Refer to figures 42 and 43 for condensate trap locations.

NOTE − If necessary the condensate trap may be installed up to 5´ away from the furnace. Use PVC pipe to connect trap to furnace condensate outlet. Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.

CONDENSATE TRAP AND PLUG LOCATIONS

Trap

(same on

right side)

1−1/2 in.

Plug

(same on left

side)

FIGURE 42

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 − Use a 3/8 allen wrench and remove plug (figure 42)

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. 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 47.

4 − Install drain trap using appropriate PVC fittings, glue

all joints. Glue the provided drain trap as shown in figure 47. Route the condensate line to an open drain.

5 − Figure 44 shows the furnace and evaporator coil using

a separate drain. If necessary, the condensate line from the furnace and evaporator coil can drain together. See figures 45 and 46. The field provided vent must be a minimum 1" to a maximum 2" length above the condensate 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.

NOTE − Vinyl tubing may be used for condensate drain. Tubing must be 1−1/4" OD X 1" ID and should be attached to the drain on the trap using a hose clamp.

Page 33

Page 34

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 available 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.

IMPORTANT

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

EL195DF with Evaporator Coil Using a Common Drain

CONDENSATE TRAP LOCATION

(shown with right side exit of condensation)

Trap can be installed a

maximum of 5 ft. 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 of 1/4" per ft. toward trap.

FIGURE 43

EL195DF with Evaporator Coil

Using a Separate Drain

Field−Provided Vent

(1" Min. to 2" Max. above

condensate drain connection)

Field−Provided Vent

(1" Min. to 2" Max. above

condensate drain connection)

Condensate

Drain Connection

Evaporator Drain

Line Vent Required

FIGURE 45

Condensate Trap With Optional Overflow Switch

From Evaporator Coil

above condensate drain connection)

Optional

Overflow Switch

Field−Provided Vent

1" Min. to 2" Max.

Furnace Condensate

Drain Connection

Condensate

Drain Connection

Evaporator Drain

Line Vent Required

FIGURE 44

To Drain

FIGURE 46

Drain

CAUTION

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

Page 34

Page 35

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

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 47

Page 35

Page 36

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 powe r company and have voltage condition corrected before 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 because some gas is heavier than air and will settle on the floor.

The gas valve on the EL195DF 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 attempted repair may result in a fire or explosion.

Placing the furnace into operation:

EL195DF units are equipped with a SureLight ignition system. Do not attempt to manually light burners on this 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 SureLightt 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 allow 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 sufficient water to ensure proper condensate drain operation.

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 48)

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 48. 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 instructions. If you do not smell gas go to next step.

8 − Move gas valve switch to ON. See figure 48.

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

(under

barbed

fitting)

INLET

PRESSURE

PORT

GAS VALVE SHOWN IN ON POSITION

MANIFOLD

PRESSURE

OUTLET

FIGURE 48

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 technician 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 36

Page 37

IV−HEATING SYSTEM SERVICE CHECKS

A−C.S.A. Certification

All units are C.S.A. design certified without modifications. Refer to the EL195DF Operation and Installation Instruction Manual Information.

WARNING

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

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. The flexible connector can then be added between the black iron pipe and the gas supply line.

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

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 disconnected and isolated. Gas valves can be damaged if subjected to more than 0.5psig (14" W.C.). See figure 49.

MANUAL MAIN SHUT−OFF

VALVE WILL NOT HOLD

NORMAL TEST PRESSURE

1/8" N.P.T. PLUGGED TAP

CAP

FIGURE 49

When checking piping connections for gas leaks, use preferred means. Kitchen detergents can cause harmful corrosion on various metals used in gas piping. Use of a specialty Gas Leak Detector is strongly recommended. It is available through Lennox under part number 31B2001. See Corp. 8411−L10, for further details.

FURNACE

ISOLATE

GAS VALVE

D−Testing Gas Supply Pressure

When testing supply gas pressure, use the 1/8" N.P.T. plugged tap or pressure post located on the gas valve to facilitate test gauge connection. See figure 48. Check gas line pressure with unit firing at maximum rate. Low pressure may result in erratic operation or underfire. High pressure can result in permanent damage to gas valve or overfire.

On multiple unit installations, each unit should be checked separately, with and without units operating. Supply pressure must fall within range listed in table 13.

E−Check Manifold Pressure

After line pressure has been checked and adjusted, check manifold pressure. Move pressure gauge to outlet pressure tap located on unit gas valve (GV1). Checks of manifold pressure are made as verification of proper regulator adjustment.

IMPORTANT

For safety, connect a shut-off valve between the manometer and the gas tap to permit shut off of gas pressure to the manometer.

1 − Remove the threaded plug from the outlet side of the

gas valve and install a field−provided barbed fitting. Connect to a manometer to measure manifold pressure.

2 − Start unit and allow 5 minutes for unit to reach steady

state.

3 − While waiting for the unit to stabilize, observe the

flame. Flame should be stable and should not lift from burner. Natural gas should burn blue.

4 − After allowing unit to stabilize for 5 minutes, record

manifold pressure and compare to value given in table

13.

NOTE − Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.

TABLE 13

Manifold and Supply Pressure (Outlet) inches w.c.

Supply

Pressure

in.wg.

Min. Max.

4.5 10.0

11.0 13.0

Model

Fuel

Nat All sizes

LP/Propane All sizes

Input Sizes

Manifold

Pressure

in.wg.

3.5

10.0

Page 37

Page 38

F− Proper Gas Flow (Approximate) Gas Flow (Approximate)

TABLE 14

GAS METER CLOCKING CHART

Seconds for One Revolution

EL195

Unit

Natural LP

1 cu ft

Dial

2 cu ft

Dial

1 cu ft

Dial

2 cu ft

DIAL

−045 80 160 200 400

−070 55 110 136 272

−090 41 82 102 204

−110 33 66 82 164

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

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

Furnace should operate at least 5 minutes before checking gas flow. Determine time in seconds for two revolutions of gas through the meter. (Two revolutions assures a more accurate time). Divide by two and compare to time in table 14. If manifold pressure matches table 13 and rate is incorrect, check gas orifices for proper size and restriction. Remove temporary gas meter if installed.

G− Proper Combustion

Furnace should operate at least 15 minutes with correct manifold pressure and gas flow rate before checking combustions. Take sample beyond the flue outlet and compare to table 15.

TABLE 15

EL195

Unit

CO2%

For Nat

CO2%

For LP

−045

−070

−090

7.2 − 8.2 8.6 − 9.6

−110

The maximum carbon monoxide reading should not exceed 50 ppm.

H− High Altitude

NOTE − In Canada, certification for installations at elevations over 4500 feet (1372 m) is the jurisdiction of local authorities.

EL195DF units require no manifold pressure adjustments for operation at altitudes up to 10,000 feet (3048 m) above sea level. Units installed at altitude of 4501 − 10,000 feet (1373 to 3048m) require a pressure switch change which can be ordered separately. Table 16 lists conversion kit and pressure switch requirements at varying altitudes. The combustion air pressure switch is factory−set and requires no adjustment.

NOTE − A natural to LP/propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion procedure.

TABLE 16

Conversion Kit and Pressure Switch Requirements at Varying Altitudes

EL195

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)

No Change 80W60

−070 80W66 80W59

−090 80W65 80W59

*69W73 73W37 *68W68

−110 80W66 80W59

* 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).

Page 38

Page 39

I− Proper Ground and Voltage

A poorly grounded furnace can contribute to premature ignitor 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 50. 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 readings exceed the maximum shown in table 1, make repairs before operating the furnace.

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

Line Neutral (spade terminals) on the integrated control. See figure 50. This voltage should be in the range of 97 to 132 Vac

TABLE 17

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

Red LED

Recall

CHECK VOLTAGE BETWEEN LINE HOT

AND LINE NEUTRAL

Red LED

Recall

FIGURE 50

Page 39

Page 40

V−TYPICAL OPERATING CHARACTERISTICS

A−Blower Operation and Adjustment1

NOTE− The following is a generalized procedure and does not apply to all thermostat controls.

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 51)

Temperature rise for EL195UH units depends on unit input, 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.

C−External Static Pressure

1 − Tap locations shown in figure 52. 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.

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 external static

pressure drop must not be more than 0.5" W.C. For

cooling speed external static pressure drop must not

be more than 0.8" 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)

TEMPERATURE RISE

Supply Duct Temperature ________

Return Duct Temperature _ _____

Temperature Rise = ________

SUPPLY

AIR

Temperatures

RETURN AIR

FIGURE 51

Supply Air

Duct Static

Return Air

FIGURE 53

D−Blower Speed Taps

Blower speed tap changes are made on the integrated control. See figure 4. The heating tap is connected to the HEAT" terminal and the cooling tap is connected to the COOL" terminal. On all units the continuous blower tap is connected to the FAN" terminal. Unused taps must be secured on two dummy terminals labeled "PARK. To change out existing speed tap, turn off power and switch out speed tap with tap connected to PARK". See blower speed tap table on unit diagram for motor tap colors for each speed.

Page 40

Page 41

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 operation, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace. When servicing controls, label all wires prior to disconnecting. 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.

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 injury 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 18 lists recommended filter sizes.

TABLE 18

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). Correct voltage is 120VAC + 10%

3 − Check amp−draw on the blower motor with blower ac-

cess panel in place. Motor Nameplate__________Actual__________

Filter Size

16 x 25 x 1 (1)

Check Motor AMP Draw

(Typical set−up with upflow furnace shown)

OFF

EX MR W 3

kWh kVAr

COMMV3V1

AMP Meter

FIGURE 54

Winterizing and Condensate Trap Care

1 − Turn off power to the furnace. 2 − Have a shallow pan ready to empty condensate water. 3 − Remove the clean out cap from the condensate trap

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

Cleaning Heat Exchanger

If cleaning the heat exchanger becomes necessary, follow the below procedures and refer to figure 1 when disassembling unit. Use papers or protective covering in front of furnace 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.

Page 41

Page 42

13 − Remove electrical junction box from the side of the fur-

nace.

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 after 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 42

Page 43

VII−WIRING DIAGRAM AND SEQUENCE OF OPERATION

1 − When there is a call for heat, W1 of the thermostat energizes W of

the furnace control with 24VAC.

2 − S10 primary limit switch and S47 rollout switch are closed. Call for

heat can continue.

3 − The integrated contol (A92) energizes combustion air inducer B6.

Combustion air inducer runs until S18 combustion air prove switch closes (switch must close within 2−1/2 minutes or control goes into 5 minute Watchguard Pressure Switch delay). Once S18 closes, a 15−second pre−purge follows.

4 − The integrated control (A92) energizes ignitor. A 20−second warm−

up period begins.

5 − Gas valve opens for a 4−second trial for ignition

6 − Flame is sensed, gas valve remains open for the heat call.

7 − After 30−second delay, the integrated control (A92) energizes indoor

blower B3.

8 − When heat demand is satisfied, W1 of the indoor thermostat de−en-

ergizes W of the integrated control which de−energizes the gas valve. Combustion air inducer B6 continues a 5−second post−purge period, and indoor blower B3 completes a selected OFF time delay.

Page 43

Page 44

Troubleshooting: Heating Sequence of Operation

HEATING SEQUENCE OF OPERATION

NORMAL HEATING MODE

POWER ON

CONTROL SELF−CHECK OKAY?

YES

IS POLARITY CORRECT?

YES

IS THERE A PROPER GROUND?

YES

IS VOLTAGE

ABOVE 70 VOLTS?

YES

ROLLOUT SWITCH CLOSED?

YES

ABNORMAL HEATING MODE

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER DELAY OFF.

LED SLOW FLASH

(RESET CONTROL BY TURNING MAIN POWER OFF.)

LED FLASHES CODE 1 − POLARITY

REVERSED.

LED FLASHES CODE 2 − IMPROPER

GROUND.

LED FLASHES CODE 13 − LOW LINE VOLTAGE.

CONTROL WILL NOT RESPOND TO A CALL FOR

HEATING UNTIL VOLTAGE RISES ABOVE 75 VOLTS.

LED FLASHES CODE 8 − ROLLOUT SWITCH OPEN.

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

INDOOR BLOWER ON.

SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES

AND POWER IS RESET OR T’STAT IS INTERRUPTED

FOR MINIMUM OF 1 SECOND.

BURNER OFF?

YES

NORMAL OPERATION:

LED SLOW FLASH

YES

THERMOSTAT CALLS FOR HEAT:

LED SLOW FLASH

YES

PRIMARY LIMIT SWITCH. CLOSED?

YES

IS COMBUSTION AIR

PRESSURE SWITCH OPEN?

YES

IS COMBUSTION AIR INDUCER

ENERGIZED?

YES

HAS COMBUSTION AIR PRESSURE

SWITCH CLOSED IN 2.5 MINUTES?

YES

CONTINUED NEXT PAGE

LED FLASHES CODE 9 − PRESSURE SWITCH FAILED

PRESSURE SWITCH IS IN WATCHGUARD MODE. GAS

LED FLASHES CODE 12 − FLAME SENSED

WITHOUT GAS VALVE ENERGIZED.

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

INDOOR BLOWER ON HEATING SPEED.

LED FLASHES CODE 7 − PRIMARY

LMIT OPEN. COMBUSTION AIR

INDUCER OFF.I NDOOR BLOWER ON

LED FLASHES CODE 11 − PRESSURE

TO CLOSE OR OPENED DURING HEAT DEMAND.

VALVE OFF. COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF WITH DELAY. IS 5-MINUTE

GAS VALVE OFF COMBUSTION AIR

(Sequence holds until pressure switch

RESET PERIOD COMPLETE?

SWITCH CLOSED.

INDUCER OFF. INDOOR BLOWER

OFF WITH DELAY.

opens or thermostat resets control.)

YES

Page 44

Page 45

Troubleshooting: Heating Sequence of Operation (Continued)

HEATING SEQUENCE CONTINUED

NORMAL HEATING MODE ABNORMAL HEATING MODE

15-SECOND COMBUSTION AIR INDUCER PREPURGE

INITIATED BY CLOSED PRESSURE SWITCH.

YES

IGNITOR WARM-UP −− 20 SECONDS.

YES

4-SECOND TRIAL FOR IGNITION.

GAS VALVE OPENS. IGNITOR ENERGIZED FOR

FIRST 3 SECONDS OF THE TRIAL.

YES

FLAME STABILIZATION PERIOD.

4 SECONDS

FLAME RECTIFICATION CURRENT

CHECK. CAN FLAME BE PROVEN WITHIN

4 SECONDS AFTER GAS VALVE OPENS?

(0.5 microamps)

YES

FLAME PRESENT?

YES

FLAME SIGNAL 1.5 MICROAMPS OR GREATER?

YES

INDOOR BLOWER ON

AFTER 30−SECOND DELAY

YES

PRIMARY LIMIT SWITCH CLOSED?

YES

ROLLOUT SWITCH CLOSED?

YES

COMBUSTION AIR PRESSURE

SWITCH CLOSED?

YES

THERMOSTAT DEMAND SATISFIED.

YES

LED SLOW FLASH.

YES

COMB. AIR INDUCER CONTINUES 5-SECOND

POST PURGE AFTER T’STAT DEMAND IS SATISFIED.

INDOOR AIR BLOWER COMPLETES SELECTED OFF"

DELAY BEFORE SHUTTING OFF.

IS VOLTAGE ABOVE 70 VOLTS?

YES

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

HAS CONTROL FAILED TO SENSE FLAME FOR

FIVE CONSECUTIVE TRIES DURING A SINGLE

LED SIGNAL WATCHGUARD FAILURE CODE

WATCHGUARD MODE. GAS VALVE OFF.

INDOOR BLOWER OFF WITH DELAY

IS 60-MINUTE RESET PERIOD COMPLETE?

LED FLASHES CODE 4 − LOW

(Does not affect operation of control)

LED FLASHES CODE 7 − PRIMARY LIMIT OPEN

COMBUSTION AIR INDUCER DE−ENERGIZED.

INDOOR BLOWER ON UNTIL SWITCH CLOSES.

HAS PRIMARY LIMIT RESET

TIME EXCEEDED 3 MINUTES?

GAS VALVE POWER OFF. COMBUSTION AIR INDUCER POWER ON. INDOOR BLOWER ON SEQUENCE HOLDS UNTIL ROLLOUT

SWITCH IS RESET AND MAIN POWER IS INTERRUPTED OR

HAS PRESSURE SWITCH OPENED 5

TIMES IN SAME HEAT DEMAND

INDOOR BLOWER OFF WITH DELAY

HAS CAI SWITCH CLOSED IN 2.5 MINUTES?

INDOOR BLOWER OFF.

COMBUSTION AIR INDUCER OFF.

HAS CONTROL RESET IGNITION

SEQUENCE FOUR TIMES?

FLAME SIGNAL.

GAS VALVE DE−ENERGIZED.

LIMIT SWITCH CLOSED?

YES

LED FLASHES CODE 8 − ROLLOUT SWITCH OPEN.

THERMOSTAT IS CYCLED OFF/ON FOR 1 SEC. MINIMUM.

GAS VALVE DE−ENERGIZED.

COMBUSTION AIR INDUCER ON.

5-MINUTE PRESSURE SWITCH

WATCHGUARD MODE.

HEAT DEMAND?

LED FLASHES CODE 13 −

LOW LINE VOLTAGE.

ONCE VOLTAGE IS ABOVE

75 VOLTS, HEATING

SEQUENCE RESTARTS.

YES

LED FLASHES CODE

7 − PRIMARY LIMIT

OPEN. GAS VALVE,

COMB. AIR INDUCER

AND INDOOR BLOW-

ER OFF. LEDs SIGNAL

LIMIT SWITCH OPEN

UNTIL MAIN

POWER IS INTERRUPTED OR T’STAT IS CYCLED

OFF/ON FOR 1 SEC.

MINIMUM. 60−MINUTE

WATCHGUARD PE-

YES

RIOD STARTS AT

TIME LIMIT CLOSES.

IS 60−MIN. PERIOD

COMPLETE?

LED FLASHES

YES

1 HR PRESSURE

WATCHGUARD

YES

CODE 10

SWITCH

MODE

Page 45

Page 46

Troubleshooting: Cooling Sequence of Operation

COOLING SEQUENCE OF OPERATION

NORMAL COOLING MODE ABNORMAL COOLING MODE

POWER ON

IGNITION CONTROL MAIN POWER ON.

CONTROL SELF DIAGNOSTIC CHECK.

IS CONTROL OPERATING NORMALLY?

YES

IS THERE A PROPER GROUND?

YES

IS POLARITY CORRECT?

YES

IS VOLTAGE

ABOVE 70 VOLTS?

YES

ROLLOUT SWITCH MONITORED CONTINUOUSLY.

IS ROLLOUT SWITCH CLOSED?

YES

LED FLASHES STEADY − CIRCUIT BOARD FAILURE

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF WITH NORMAL DELAY.

INTERRUPT MAIN POWER TO RESET CONTROL.

LED FLASHES CODE 2 IMPROPER GROUND

CONTROL WILL CONTINUE TO CALL FOR COOLING

IN THIS CONDITION.

LED FLASHES CODE 1 POLARITY REVERSED

CONTROL WILL CONTINUE TO CALL FOR COOLING IN

THIS CONDITION.

LED FLASHES CODE 13 LOW VOLTAGE. CONTROL

WILL CONTINUE TO CALL FOR COOLING

IN THIS CONDITION.

LED FLASHES CODE 8 ROLLOUT SWITCH OPEN. GAS

VALVE OFF. COMBUSTION AIR INDUCER ON. INDOOR

BLOWER ON. SEQUENCE HOLDS UNTIL ROLLOUT SWITCH

CLOSES AND MAIN POWER IS INTERRUPTED OR

THERMOSTAT IS CYCLED OFF/ON FOR 1 SEC. MINIMUM.

LED: SLOW FLASH RATE REMAINS UNCHANGED

THROUGHOUT COOLING CYCLE.

THERMOSTAT CALLS FOR COOLING.

COMPRESSOR CONTACTOR AND SYSTEM FAN

ENERGIZED WITH 2-SECOND DELAY

(COOLING SPEED)

THERMOSTAT OPENS.

COMPRESSOR OFF.

SYSTEM FAN AND EAC TERM. OFF

WITH 45-SECOND DELAY.

Page 46

Page 47

Troubleshooting: Continuous Fan / Accessories Sequence of Operation

CONTINUOUS FAN / ACCESSORIES SEQUENCE OF OPERATION

LED: SLOW FLASH RATE REMAINS

UNCHANGED THROUGHOUT SEQUENCE.

MANUAL FAN SELECTION MADE AT THERMOSTAT.

CONTROL (G) ENERGIZES SYSTEM FAN AT FAN

SPEED. EAC TERMINAL IS ENERGIZED.

THERMOSTAT CALLS FOR HEAT (W).

THERMOSTAT CALLS FOR COOLING.

YES

SYSTEM FAN SWITCHED TO COOL SPEED.

EAC TERM. REMAINS ON.

YES

SYSTEM FAN CONTINUES FAN SPEED WITHOUT

INTERRUPTION. EAC TERMINAL REMAIN ON.

HUM TERMINALS ARE ENERGIZED WITH

COMBUSTION AIR BLOWER.

THERMOSTAT OPENS.

MANUAL FAN SELECTION MADE AT THERMOSTAT.

CONTROL (G) ENERGIZES SYSTEM FAN AT FAN

SPEED. EAC TERM. ENERGIZED.

SYSTEM FAN SWITCHES TO HEAT SPEAD AFTER 30

SECOND DELAY. EAC AND HUM TERMINALS REMAIN ON.

THERMOSTAT OPENS.

HUM. TERMINALS OFF AFTER POST PURGE BY COMBUSTION AIR INDUCER. SYTEM FAN

SWITCHES TO FAN SPEED AFTER BLOWER

OFF DELAY. EAC CONTINUES WITHOUT

INTERUPTION.

Page 47

Lennox EL195DF User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual