Lennox EL195UHE, EL195UH045XE36B, EL195UH110XE60C, EL195UH135XE60D, EL195UH070XE36B Unit Information

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Page 1

Litho U.S.A.

Corp. 1118−L4

Revised 11/2011

EL195UHE

Service Literature

EL195UHE SERIES UNITS

EL195UHE series units are high−efficiency gas furnaces manufactured with Lennox DuralokPlust alumi- nized steel clamshell−type heat exchangers, with a stainless steel condensing coil. EL195UHE units are a vailable in heating input capacities of 44,000 to 132,000 Btuh and cooling applications from 2 through 5 tons. 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 EL195UHE 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.

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 7. . . . . . . . . . . . . . . . . . . . . . . . . . . .

II Placement and Installation 19. . . . . . . . . . . . . . . . . . . .

III−Start−Up 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

IV−Heating System Service Checks 43. . . . . . . . . . . . . .

V−Typical Operating Conditions 46. . . . . . . . . . . . . . . . .

VI−Maintenance 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VII−Sequence of Operation and Flow Charts 50. . . . . .

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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SPECIFICATIONS

Gas Heating Performance

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

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

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

Connections

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

in.

Condensate Drain Trap (PVC pipe) - i.d. 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

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

Indoor

Wheel nom. dia. x width - in. 10 x 8 10 x 8 10 x 10

Blower

Tons of add-on cooling 1.5 - 3 1.5 - 3 2.5 - 4

Air Volume Range - cfm 360 - 1345 495 - 1380 715 - 1740

Electrical Data Voltage 120 volts - 60 hertz - 1 phase

Blower motor full load amps 6.8 6.8 8.4

Maximum overcurrent protection 12 12 12

Shipping Data lbs. - 1 package 129 136 160

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

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

furnaces.

Model No. EL195UH045XE36B EL195UH070XE36B EL195UH090XE48C

AFUE 95% 95% 95%

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

Output - Btuh 42,000 63,000 85,000

3.5 / 10 3.5 / 10 3.5 / 10

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

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

SPECIFICATIONS

Gas Heating Performance

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

Gas Manifold Pressure (in. w.g.)

Nat. Gas / LPG/Propane

High static - in. w.g. 0.5 0.5

Connections

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

in.

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

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

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

Indoor

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

Blower

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

Air Volume Range - cfm 1010 - 2220 1235 - 2405

Electrical Data Voltage 120 volts - 60 hertz - 1 phase

Blower motor full load amps 10.9 10.9

Maximum overcurrent protection 12 12

Shipping Data lbs. - 1 package 170 187

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

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

furnaces.

Model No. EL195UH110XE60C EL195UH135XE60D

AFUE 95% 95%

Input - Btuh 110,000 132,000

Output - Btuh 105,000 126,000

3.5 / 10 3.5 / 10

Gas pipe size IPS 1/2 1/2

Motor output - hp 1 1

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OPTIONAL ACCESSORIES - MUST BE ORDERED EXTRA

“B” Width

Models

CABINET ACCESSORIES

Horizontal Suspension Kit - Horizontal only 51W10 51W10 51W10

Return Air Base - Upow only 50W98 50W99 51W00

CONDENSATE DRAIN KITS

Condensate Drain Heat Cable 6 ft. 26K68 26K68 26K68

24 ft. 26K69 26K69 26K69

50 ft. 26K70 26K70 26K70

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

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

Crawl Space Vent Drain Kit 51W18 51W18 51W18

FILTER KITS

Air Filter and

Rack Kit

Horizontal (end) Size of lter - in. 87L96 - 18 x 25 x 1 87L97 - 20 x 25 x 1 87L98 - 25 x 25 x 1

Side Return Single 44J22 44J22 44J22

Ten Pack 66K63 66K63 66K63

Size of lter - in. 16 x 25 x 1 16 x 25 x 1 16 x 25 x 1

NIGHT SERVICE KIT

Night Service Kit 84W84 84W84 84W84

Safety Service Kit 89W20 89W20 89W20

TERMINATION KITS

See Installation Instructions for specic venting information.

Termination Kits Direct Vent Applications Only

Termination Kits Direct or NonDirect 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 60L46

Canada - 2 in. 44W92 44W92 - - -

3 in. - - - 44W93 44W93

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

Wall - Close

Couple

Wall - Close

Couple WTK

US - 2 in. 22G44 - - - - - -

3 in. 44J40 44J40 44J40

Canada - 2 in. 30G28 - - - - - -

3 in. 81J20 81J20 81J20

Roof 2 in. 15F75 15F75 - - -

Wall Ring Kit 2 in. 15F74

2 in. 44J41 44J41 44J41

“C” Width

“D” Width

Models

15F74 - - -

Models

GAS HEAT ACCESSORIES

High Altitude

Input

045 No Change 80W60 69W73 73W81 73W37 68W68

070 80W66 80W59 69W73 73W81 73W37 68W68

090 80W65 80W59 69W73 73W81 73W37 68W68

110 80W66 80W59 69W73 73W81 73W37 68W68

135 80W65 80W59 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

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LPG/Propane

to Natural Gas Kit

Natural Gas

High Altitude

Orice Kit

LPG/Propane

High Altitude

Orice Kit

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BLOWER DATA

EL195UH045XE36B PERFORMANCE (Less Filter)

External

Static

Pressure

in. w.g.

0.00 1345 340 1255 245 1150 185 895 105 845 95

0.10 1305 345 1225 250 1105 200 855 11 0 810 95

0.20 1290 360 1190 260 1080 205 825 120 780 105

0.30 1275 370 1150 270 1045 215 785 125 720 110

0.40 1220 385 1120 280 1015 220 735 135 690 120

0.50 1215 390 1090 290 980 230 705 140 635 125

0.60 1190 395 1060 300 950 240 650 150 600 135

0.70 1140 390 1015 300 900 250 620 155 555 140

0.80 1100 380 1000 310 870 260 580 160 520 145

0.90 970 345 930 305 825 260 535 165 460 150

EL195UH070XE36B PERFORMANCE (Less Filter)

External

Static

Pressure

in. w.g.

0.00 1380 315 1305 250 1190 200 965 105 920 100

0.10 1360 325 1270 255 1180 205 915 11 5 865 100

0.20 1310 335 1250 265 1130 215 880 120 815 11 0

0.30 1275 340 1205 275 1100 225 835 125 775 11 5

0.40 1250 355 1175 280 1065 230 795 135 730 125

0.50 1215 370 1145 295 1045 240 745 145 670 130

0.60 1200 380 1100 310 995 245 705 150 640 140

0.70 1145 380 1070 310 960 255 670 160 585 145

0.80 1070 370 1035 320 925 265 610 165 550 155

0.90 1015 365 1005 330 880 270 580 175 495 155

High Medium-High Medium Medium-Low Low

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

High Medium-High Medium Medium-Low Low

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

Air Volume / Watts at Various Blower Speeds

EL195UH090XE48C PERFORMANCE (Less Filter)

External

Static

Pressure

in. w.g.

0.00 1740 370 1505 250 1370 195 1285 160 1135 125

0.10 1695 390 1470 265 1325 205 1240 170 1090 135

0.20 1660 405 1435 280 1290 220 1195 185 1045 145

0.30 1615 415 1390 295 1240 235 1140 200 995 160

0.40 1590 425 1350 305 1200 245 1110 210 945 165

0.50 1560 440 1310 320 1155 260 1055 225 895 175

0.60 1525 455 1255 335 1105 270 1005 230 855 190

0.70 1475 470 1220 340 1065 285 960 245 805 200

0.80 1410 470 1170 355 1010 295 920 255 760 210

0.90 1305 430 1130 370 985 305 875 265 715 220

High Medium-High Medium Medium-Low Low

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

Air Volume / Watts at Various Blower Speeds

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BLOWER DATA

EL195UH110XE60C PERFORMANCE (Less Filter)

Air Volume / Watts at Different Blower Speeds

External

Static

Pressure

in. w.g.

0.00 2220 645 1940 435 1765 335 1635 280 1435 200 2185 655 1915 440 1745 340 1620 275 1430 195

0.10 2170 660 1920 460 1715 350 1595 290 1380 205 2160 660 1880 460 1705 345 1570 285 1380 205

0.20 2130 680 1865 475 1670 370 1560 305 1345 220 2115 680 1835 470 1670 365 1535 305 1325 220

0.30 2095 700 1835 490 1640 390 1525 325 1285 230 2060 705 1795 495 1630 380 1505 320 1285 230

0.40 2065

0.50 2030 740 1755 525 1560 415 1425 355 1215 260 2000 740 1720 530 1535 415 1410 345 1195 260

0.60 1995 760 1705 550 1525 435 1380 370 1150 270 1955 760 1685 550 1505 435 1380 365 1145 275

0.70 1955 770 1660 560 1475 450 1350 375 1100 290 1935 775 1650 555 1455 450 1325 375 1100 285

0.80 1930 790 1635 575 1445 460 1300 395 1050 305 1890 790 1610 575 1425 460 1285 390 1055 295

0.90 1865 775 1580 595 1400 480 1250 410 1025 310 1840 780 1565 585 1390 475 1240 395 1010 310

Bottom Return Air, Side Return Air with Optional Return Air Base, Return Air from Both Sides or Return Air from Bottom and One Side.

High Med-High Medium Med-Low Low High Med-High Medium Med-Low Low

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

720 1785 510 1600 405 1465 335 1250 245 2050 720 1760 510 1570 400 1455 330 1235 245

Single Side Return Air − Air volumes in bold require eld

fabricated transition to accommodate 20 x 25 x 1 in. air lter in order to maintain proper air velocity.

EL195UH135XE60D PERFORMANCE (Less Filter)

Air Volume / Watts at Different Blower Speeds

External

Static

Pressure

in. w.g.

0.00 2405 940 2235 735 2070 545 1830 390 1620 280 2395 925 2235 710 2020 550 1800 380 1610 275

0.10 2365 960 2210 745 2020 565 1770 400 1585 295 2360 935 2175 735 2005 555 1760 395 1550 295

0.20 2330 975 2180 770 1950 580 1745 420 1535 315 2350 955 2160 760 1955 565 1725 415 1510 300

0.30 2295 1000 2120 785 1925 595 1690 435 1480 325 2290 990 2095 775 1890 590 1700 435 1420 325

0.40 2275

0.50 2225 1025 2035 815 1845 630 1605 475 1395 360 2230 1010 2040 815 1845 625 1590 470 1375 360

0.60 2185 1010 2020 835 1815 645 1565 485 1330 365 2170 1025 2000 820 1795 640 1580 485 1335 370

0.70 2085 1005 1940 850 1735 665 1520 500 1310 385 2125 1010 1935 845 1725 660 1520 500 1295 385

0.80 2010 970 1890 860 1715 680 1465 510 1285 400 2025 980 1880 855 1705 680 1470 510 1260 405

0.90 1925 935 1830 840 1660 700 1415 530 1235 410 1945 935 1860 855 1695 695 1435 525 1220 410

Bottom Return Air, Side Return Air with Optional Return Air Base, Return Air from Both Sides or Return Air from Bottom and One Side.

High Med-High Medium Med-Low Low High Med-High Medium Med-Low Low

cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts cfm Watts

1015 2075 805 1885 615 1640 460 1445 340 2255 995 2060 795 1850 615 1635 445 1390 340

Single Side Return Air − Air volumes in bold require eld

fabricated transition to accommodate 20 x 25 x 1 in. air lter in order to maintain proper air velocity.

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EL195UHE PARTS IDENTIFICATION

FIGURE 1

TOP CAP

BURNER BOX

ASSEMBLY

DuralokPlus

HEAT EXCHANGER

ASSEMBLY

CONTROL BOX

(includes integrated ignition control, trans-

former, circuit breaker and interlock switch)

COMBUSTION AIR

INDUCER

OUTER

ACCESS

PANEL

COMBUSTION

AIR PRESSURE

SWITCH

PRIMARY LIMIT

GAS VALVE

BLOWER

ASSEMBLY

FLEXIBLE NO−HUB EXHAUST COLLAR

COLD END

HEADER BOX

BAG ASSEMBLIES

(shipping location)

BLOWER ACCESS

PAN EL

Page 7

I−UNIT COMPONENTS

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.

EL195UHE unit components are shown in figure 1. The combustion air inducer, gas valve and burners can be accessed by removing the outer access panel. The blower and control box can be accessed by removing the blower access panel.

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.

FIGURE 2

EL195UHE Control Box

Integrated Control

Door Interlock

Switch

Transformer

Circuit Breaker

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.

3. Circuit Breaker (CB8)

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

4. Integrated Ignition Control (A92)

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 hot surface ignition control system consisting of an integrated control (figure 3 with control terminal designations in tables 1, 2 and 3), sensor and ignitor (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 for troubleshooting and two accessory terminals rated at (1) one amp. See table 4 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.

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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TABLE 3

1/4" QUICK CONNECT TERMINALS

120HUM Humidifier 120VAC

LINE 120VAC

XFMR Transformer 120VAC

CIRC Indoor blower 120VAC

EAC Indoor air quality accessory 120VAC

NEUTRALS Common 120VAC

HUM24 Humidifier 24VAC

3/16" QUICK CONNECT TERMINALS

COOL Cooling tap 24VAC

HEAT Heating tap 24VAC

FAN Continuous blower 24 VAC

PARK (no power) Park terminal for unused speed taps

FS Flame sense

24 COM Common 24VAC

TABLE 4

The integrated control is equipped with an LED light for troubleshooting. The diagnostic codes are listed below in table 4.

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

1 Reverse Line Voltage Polarity

2 Improper Earth Ground

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

4 Low Flame Signal − check flame sensor

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

6 Not Used

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

8 Rollout Switch Open

9 Pressure Switch failed to close or opened during heat demand

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

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

12 Flame Sensed without gas valve energized

13 Low Line Voltage

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

Note

Last 10 error codes are stored in memory including when power is shut off to the unit. − To recall, 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 9

FIGURE 3

INTEGRATED CONTROL

(Automatic Hot Surface Ignition System)

BLOWER OFF DELAY

RED LED

RECALL BUTTON

Electronic Ignition

On a call for heat the integrated control monitors the combustion air inducer pressure switch. The control board 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 to-

tal 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.

Fan Time Control

Heating Fan On Time

The fan on time of 30 seconds is not adjustable.

Heating Fan Off Time

Fan off time (time that the blower operates after the heat demand has been satisfied) can be adjusted by moving the jumper to a different setting. The unit is shipped with a factory fan off setting of 90 seconds. For customized comfort, monitor the supply air temperature once the heat demand is satisfied. Note the supply air temperature at the instant the blower is de−energized. Adjust the fan−off delay to achieve a supply air temperature between 90° − 110° at the instant the blower is de−energized. (Longer delay times allow for lower air temperature, shorter delay times allow for higher air temperature). See figure 4.

Cooling Fan On Time

The fan on time is 2 seconds and is not adjustable.

Cooling Fan Off Time

The control has a 45 second fan off delay after cooling demand has been met. This delay is factory set and not adjustable.

HEAT FAN-OFF TIME IN SECONDS

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

achieve desired setting.

NO JUMPER

FIGURE 4

120

180

120

180

120

180

120

180

60 Second

off Time

90 Second

off Time

120 Second

off Time

180 Second

off Time

Page 10

FIGURE 5

EL195UHE Burner Box Assembly

Gas Valve

Burner Box Front

Rollout Switch(s)

Flame Sensor

Ignitor

Burner Assembly

B−Heating Components

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

1. Flame Rollout Switches (Figure 5)

Flame rollout switches S47 are SPST N.C. high temperature limits located on the left and 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 EL195UHE 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. See table 4 flash code 8 for troubleshooting.

2. Heat Exchanger (Figure 6)

EL195UHE 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 clamshe ll. 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 EL195UHE 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, remove mounting screws, rotate limit switch 90 degrees and slowly remove from the vestibule panel. Install replacement limit with sam e care. See table 4 flash code 7 for troubleshooting if limit switch opens during operation.

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FIGURE 6

Primary Limit Location and Heat Exchanger

Install limit face down

4. Gas Valve (Figure 7)

The EL195UHE uses an internally redundant 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.

FIGURE 7

GAS VALVE SHOWN IN ON POSITION

MANIFOLD

PRESSURE

OUTLET

PORT

INLET

PRESSURE

PORT

MANIFOLD PRESSURE

ADJUSTMENT SCREW

(under barbed fitting)

5. Flame Sensor (Figure 5)

A flame sensor is located on the left side of the burner support. The sensor is mounted on the front burner box plate and the tip protrudes into the flame envelope of the left− most burner. The sensor can be removed for service (use steel wool only to clean) 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 EL195UHE 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. Se e fi gure 8 for flame signal check.

1 − Set the meter to the DC amps scale. 2 − Turn off supply voltage to control. 3 − Remove sensor wire from integrated control. 4 − Connect (−) lead to flame sensor wire. 5 − Connect (+) lead to Terminal FS on integrated control. 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)

EL195UHE units use a 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 102 − 132VAC. See figure 9 for resistance and voltage checks.

Page 12

FIGURE 8

Measuring Flame Signal

Flame Signal In Microamps

Normal Low Drop Out

 1.5

0.5 − 1.4

 0.4

Set Dial to DC MicroAmps

(+)

Multi−Meter

(+)

(+) To Control

Sensor Terminal

(−) T

o Flame

Terminal

Flame Sensor

Terminal

Flame Sensor

Wire

Intergrated

Control

Remove sensor from integrated

control and connect alligator clip

(−) to flame sensor lead.

Remove sensor from integrated control and connect alligator clip

(+) to terminal on control.

Page 13

FIGURE 9

Test 1

Check ignitor circuit for correct resistance.

Remove 4−pin plug from control.

Check ohms reading across terminals 2 and 4.

Reading should be between 39 and 70 ohms. 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.

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.

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.

Multi−Meter

(set to ohms)

Multi−Meter

(set to ohms)

Multi−Meter

(set to VAC)

Page 14

7. Combustion Air Inducer (B6)

& Cold End Header Box

All EL195UHE 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 integrated control A92. Blower operates continuously while there is a call for heat. The integrated control will not proceed with the ignition sequence until combustion air inducer operation is sensed by the proving switches.

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

necessary the gaskets used to seal the box to the vestibule panel and the combustion air inducer to the box, must also be replaced.

TABLE 5

EL195UHE Unit

Combustion Air Inducer

Orifice Size

−045 0.618"

−070 0.810"

−090 0.973"

−110 1.040"

−135 1.235"

8. Combustion Air Pressure Switch

(Figure 10)

EL195UHE series units are equipped with a differential pressure switch located on the cold end header box. The switch monitors across the combustion air inducer orifice to insure proper flow through the heat exchanger.

The switch is a SPST N.O. pressure 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.

FIGURE 10

Pressure Switch

On start-up, the switch monitors whether the combustion air inducer is operating. It closes a circuit to the integrated control when the difference in pressure across the combustion air inducer orifice exceeds a non−adjustable factory setting. If the switch does not successfully sense the required differential, the switch cannot close and the furnace cannot operate. If the flue or air inlet become obstructed during operation, the switch senses a loss of pressure differential and opens the circuit to the integrated control. If the condensate line is blocked, water will back up into the header box and reduce the pressure differential across the switch. The pressure switch opens if the differential drops below the set point. See table 6.

Checks of pressure differential can aid in troubleshooting. When measuring the pressure differential, readings should be taken at the pressure switch. See figure 11and table 7. Lack of differential usually indicates problems in the intake or exhaust piping, but may indicate problems in the heat exchanger, condensing coil, header boxes, combustion inducer or other components.

TABLE 6

Unit

Altitude ft.

0 − 4500 4501 − 7500 7501 − 10000

Set Point w.c. Set Point w.c Set Point w.c.

−045 −0.65 −0.65 −0.60

−070 −0.90 −0.85 −0.65

−090 −0.90 −0.80 −0.65

−110 −0.90 −0.85 −0.65

−135 −0.90 −0.80 −0.65

*Set point is factory set and non−adjustable

Page 15

To Cold End Header Box

Field Provided Tubing

To Pressure Switch

To Cold End Header Box

FIGURE 11

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.

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 6.

5 − Remove thermostat demand and allow to cycle off.

6 − Remove manometer and tee’s. Reinstall combustion

air sensing hoses to the pressure switch.

Measuring Pressure Differential

Black Tubing

(positive +)

Red Tubing

(negative −)

+"

High

−"

Low

Page 16

TABLE 7

Pressure Switch Troubleshooting Guide

Problem Corrective Action

Pressure switch stuck closed

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

Pressure switch does not close due to

obstruction in vent pipe.

Check for restricted vent. Remove all blockage. Check for proper vent sizing. See table 11.

Pressure switch does not close due to

incorrect routing of the pressure

switch tubing.

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

Pressure switch does not close due to

obstructions in the pressure switch

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.

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 table11.

Wrong pressure switch installed in the

unit, or pressure switch is out of cal-

ibration

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

Miswiring of furnace or improper con-

nections at pressure switch.

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

Pressure switch failure.

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.

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

Air leakage around the combustion air

inducer gasket.

Check gasket and replace if necessary.

Air leakage around the cold end head-

er box gasket.

Check gasket and replace if necessary.

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

DEMAND

CAI

GAS VALVE

OFF

IGNITOR

341

Pre −Purge Ignitor Warm−up

Trial for Ignition

Post

Purge

5 SEC80

*Blower on time will be 30 seconds after flame is sensed. Blower off time will depend on OFF TIME" Setting.

INDOOR BLOWER

ЙЙЙЙЙЙЙЙЙ

Blower On"*

Delay

ELECTRONIC IGNITION

FIGURE 12

Page 17

C− Blower Compartment

IMPORTANT

Each blower is statically and dynamically balanced as an assembly before installation in the unit.

ML195UHE units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing. The motor is programmed to provide constant torque at each of the five selectable speed taps. Each tap requires 24 volts to energize.

Input Voltage Requirements

The circuit is designed to be operated with AC voltage. To enable a tap requires 12 to 33VAC. Expected current draw will be less than 20mA.

Troubleshooting

Troubleshooting the motor is an easy process. Follow steps below.

1− Shut off power to unit.

2− Remove input plugs P48 and P49 from motor. See

figure 16 for troubleshooting procedure. If correct voltage is present in tests 1 and 2 and motor is not operating properly, replace motor. The motor is not field repairable.

If replacing the indoor blower motor or blower wheel is necessary, placement is critical. The blower wheel must be centered in the blower housing as shown in figure 13. When replacing the indoor blower motor the set screw must be aligned and tightened with the motor shaft as shown in figure

14.

9. Secondary Limit Controls

The secondary limit is located in the blower compartment on the back side of the blower housing. See figure 15. When excess heat is sensed in the blower compartment, the limit will open. If the limit is open, the furnace control energizes the supply air blower and closes the gas valve. The limit automatically resets when unit temperature returns to normal. The secondary limit cannot be adjusted.

FIGURE 13

Center Blower Wheel

in Blower Housing

BLOWER WHEEL REPLACEMENT

FIGURE 14

Set Screw

Housing Hub

ALIGN AND TIGHTEN SET SCREW WITH

FLAT SIDE OF MOTOR SHAFT

Motor

Shaft

FIGURE 15

SECONDARY LIMIT CONTROL

Secondary Limits

Page 18

Multi−Meter (set to VAC)

P48

P49

12012

Turn on power to unit. Check for 120 volts across terminals L" and N" on input plug P48. If voltage is present continue to test 2. If voltage is not present problem may be may be upstream of plug P48 and proceed to test 3.

Multi−Meter

(set to VAC)

P48

P49

Switch thermostat to CONTINUOUS FAN MODE. Check for 24 volts across terminal C" on input plug P48and speed tap used for continuous fan. (1, 2, 3, 4 or 5) on input plug P49. If 24 volts is not present problem may be up stream of plug P49. Proceed to test 4.

Multi−Meter

(set to VAC)

12012

Multi−Meter

(set to VAC)

Check for 24 volts across terminals 24 COM" and FAN" terminals on the integrated control. If voltage is present, problem is with the harness. If voltage is not present problem may be may be with the integrated control

Check for 120 volts across terminals CIRC" and Neutrals" on the integrated control. If voltage is present, problem is with the harness. If voltage is not present problem may be may be with the integrated control.

Test 1

Test 2

Test 3 (if necessary)

Test 4 (if necessary)

FIGURE 16

Page 19

II−PLACEMENT AND INSTALLATION

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 8 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.

TABLE 8

PIPING AND FITTINGS SPECIFICATIONS

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

Schedule 40 PVC (Fittings) D2466

Schedule 40 CPVC (Pipe) F441

Schedule 40 CPVC (Fittings) F438

SDR−21 PVC or SDR−26 PVC (Pipe) D2241

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

Schedule 40 ABS Cellular Core DWV (Pipe) F628

Schedule 40 ABS (Pipe) D1527

Schedule 40 ABS (Fittings) D2468

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

D2661

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

D2665

PRIMER & SOLVENT CEMENT

ASTM

SPECIFICATION

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

D2564, D2235, F493

ABS to PVC or CPVC Transition Solvent Cement

D3138

CANADA PIPE & FITTING & SOLVENT

CEMENT

MARKING

PVC & CPVC Pipe and Fittings

ULCS636

PVC & CPVC Solvent Cement

ABS to PVC or CPVC Transition Cement

IMPORTANT

EL195UHE 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 8. 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 20

TABLE 9

OUTDOOR TERMINATION KITS USAGE

EL195

UNIT

VENT

PIPE

DIA.

(in.)

STANDARD CONCENTRIC

Outdoor Exhaust

Accelerator

(Dia. X

Length)

Outdoor Exhaust

Accelerator

(Dia. X

Length)

2" Wall Plate

Kit

3" Wall Plate

Kit

2" Wall

Ring Kit

FlushMount

Kit

1−1/2"

Concentric

Kit

Concentric

Kit

Concentric

Kit

1−1/2" X 12" 2" X 12"

22G44

or 30G28

44J40

or 81J20

15F74 51W11**

71M80

44W92

69M29

44W92

60L46

or 44W93

045

2 YES YES YES* YES YES YES

2−1/2 YES YES YES* YES YES YES

3 YES YES YES* YES YES YES

070

2 YES YES YES* YES YES YES

2−1/2 YES YES YES* YES YES YES

3 YES YES YES* YES YES YES

090

2 YES YES YES YES YES YES

2−1/2 YES YES YES YES YES YES

3 YES YES YES YES YES YES

110

2 YES YES YES YES YES YES

2−1/2 YES YES YES YES YES YES

3 YES YES YES YES YES YES

135 3 YES YES YES YES

*Requires field−provided and installed 1−1/2" exhaust accelerator. ** Kit 51W11 is provided with a 1−1/2" accelerator which must be used for all EL195UHXE−045, −070 and −090 installations.  Termination kits 44W92, 44W93, 30G28 and 81J20 approved for use in Canadian installations to meet CSAB149.  The 44W92 concentric kit is provided with a 1−1/2" accelerator which must be installed on the exhaust outlet when this kit is used with the EL195UHXE04536B and

EL195UHXE070P36B furnaces. NOTE − Standard terminations include all approved non−concentric terminations.

Joint Cementing Procedure

All cementing of joints should be done according to the specifications outlined in ASTM D 2855.

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.

NOTE − Time is critical at this stage. Do not allow primer to dry before applying cement.

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.

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.

Page 21

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.

Venting Practices

FIGURE 17

* See table 8 for allowable pipe.

Piping Suspension Guidelines

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

SCHEDULE 40

PVC − 5’

all other pipe* − 3’

Wall

inside outside

24" maximum 3/4" minimum

Wall Thickness Guidelines

insulation

(if required)

10. 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.

11. 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.

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

FURNACE

(Replaced by EL195)

WATER

HEATER

OPENINGS (To Adjacent

Room)

If an EL195UHE 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.

FIGURE 18

REPLACING FURNACE THAT

WAS PART OF A COMMON

VENT SYSTEM

Exhaust Piping (Figures 21 and 22)

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

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.

Page 22

Vent Piping Guidelines

The EL195UHE 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 10 and

11. Table 10 lists the minimum vent pipe

lengths permitted. Table 11 lists the maximum pipe lengths permitted.

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 14.

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.

NOTE − The exhaust collar on all models is sized to accommodate 2" Schedule 40 vent pipe. In horizontal applications, any transition to exhaust pipe larger than 2" must be made in vertical runs of the pipe. Therefore a 2" elbow must be added before the pipe is transitioned to any size larger than 2". This elbow must be added to the elbow count used to determine acceptable vent lengths. Contact the Application Department for more information concerning sizing of vent systems which include multiple pipe sizes.

FIGURE 19

12" max

of straight pipe

Exhaust Pipe

12" Min.

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

NOTE − All horizontal runs of exhaust pipe must slope back to-

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

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

Horizontal Application

TABLE 10

MINIMUM VENT PIPE LENGTHS

EL195UHE

MODEL

MIN. VENT LENGTH*

045, 070, 090, 110, 135

15 ft. or

5 ft. plus 2 elbows or

10 ft. plus 1 elbow

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

Use the following steps to correctly size vent pipe diameter.

045, 070, 090, 110 or 135 btuh

Which termination?

Standard or Concentric? See table 9

Intake or exhaust

Which needs most elbows?

How many?

2", 2 1/2" or 3"

Desired pipe size?

Use table 11 to find max intake or exhaust pipe length for all altitudes.

FIGURE 20

Furnace capacity?

Is the intake air taken from a vetilated attic or crawl space?

YES

Use table 12 to find max pipe length for all altitudes

(exhaust pipe only)

IMPORTANT

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

Page 23

TABLE 11

Maximum Allowable Intake or Exhaust Vent Length in Feet

*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.

Standard Termination at Elevation 0 − 4500 ft

Number Of 90° Elbows

Used

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

045 070 090 110 135 045 070 090 110 135 045 070 090 11 0 135

1 81 66 44 24

n/a

115 115 93 58

n/a

138 137 11 8 118 114

2 76 61 39 19 110 110 88 53 133 132 11 3 113 109

3 71 56 34 14 105 105 83 48 128 127 108 108 104

4 66 51 29

n/a

100 100 78 43 123 122 103 103 99

5 61 46 24 95 95 73 38 118 117 98 98 94

6 56 41 19 90 90 68 33 113 112 93 93 89

7 51 36 14 85 85 63 28 108 107 88 88 84

8 46 31

n/a

80 80 58 23 103 102 83 83 79

9 41 26 75 75 53 18 98 97 78 78 74

10 36 21 70 70 48 13 93 92 73 73 69

Standard Termination Elevation 4500 − 10,000 ft

Number Of 90° Elbows

Used

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

045 070 090 110 135 045 070 090 110 135 045 070 090 11 0 135

1 81 66 44

n/a n/a

115 115 93 58

n/a

138 137 11 8 118 114

2 76 61 39 11 0 110 88 53 133 132 113 11 3 109

3 71 56 34 105 105 83 48 128 127 108 108 104

4 66 51 29 100 100 78 43 123 122 103 103 99

5 61 46 24 95 95 73 38 118 117 98 98 94

6 56 41 19 90 90 68 33 113 112 93 93 89

7 51 36 14 85 85 63 28 108 107 88 88 84

8 46 31

n/a

80 80 58 23 103 102 83 83 79

9 41 26 75 75 53 18 98 97 78 78 74

10 36 21 70 70 48 13 93 92 73 73 69

Page 24

TABLE 11 Continued

Maximum Allowable Intake or Exhaust Vent Length in Feet

*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.

Concentric Termination at Elevation 0 − 4500 ft

Number Of

90° Elbows

Used

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

1 73 58 42 22

n/a

105 105 89 54

n/a

121 121 114 114 105

2 68 53 37 17 100 100 84 49 116 116 109 109 100

3 63 48 32 12 95 95 79 44 111 111 104 104 95

4 58 43 27

n/a

90 90 74 39 106 106 99 99 90

5 53 38 22 85 85 69 34 101 101 94 94 85

6 48 33 17 80 80 64 29 96 96 89 89 80

7 43 28 12 75 75 59 24 91 91 84 84 75

8 38 23

n/a

70 70 54 19 86 86 79 79 70

9 33 18 65 65 49 14 81 81 74 74 65

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

Concentric Termination Elevation 4501 − 10,000 ft

Number Of

90° Elbows

Used

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

1 73 58 42

n/a n/a

105 105 89 54

n/a

121 121 114 114 105

2 68 53 37 100 100 84 49 116 116 109 109 100

3 63 48 32 95 95 79 44 111 111 104 104 95

4 58 43 27 90 90 74 39 106 106 99 99 90

5 53 38 22 85 85 69 34 101 101 94 94 85

6 48 33 17 80 80 64 29 96 96 89 89 80

7 43 28 12 75 75 59 24 91 91 84 84 75

8 38 23

n/a

70 70 54 19 86 86 79 79 70

9 33 18 65 65 49 14 81 81 74 74 65

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

Page 25

TABLE 12

Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated

Attic or Crawl Space For Intake Air in Feet

Standard Termination at Elevation 0 − 4500 ft

Number Of 90° Elbows

Used

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

045 070 090 110 135 045 070 090 110 135 045 070 090 11 0 135

1 71 56 34 14

n/a

100 100 78 43

n/a

118 117 98 98 94

2 66 51 29 9 95 95 73 38 113 11 2 93 93 89

3 61 46 24 4 90 90 68 33 108 107 88 88 84

4 56 41 19

n/a

85 85 63 28 103 102 83 83 79

5 51 36 14 80 80 58 23 98 97 78 78 74

6 46 31 9 85 75 63 18 93 92 73 73 69

7 41 26 4 70 70 48 13 88 87 68 68 64

8 36 21

n/a

65 65 43 8 83 82 63 63 59

9 31 16 60 60 38 3 78 77 58 58 54

10 26 11 55 55 33 n/a 73 72 53 53 49

Standard Termination Elevation 4500 − 10,000 ft

Number Of 90° Elbows

Used

2" Pipe 2−1/2" Pipe 3" Pipe

Model Model Model

045 070 090 110 135 045 070 090 110 135 045 070 090 11 0 135

1 71 56 34

n/a n/a

100 100 78 43

n/a

118 117 98 98 94

2 66 51 29 95 95 73 38 113 112 93 93 89

3 61 46 24 90 90 68 33 118 107 88 88 84

4 56 41 19 85 85 63 28 113 102 83 83 79

5 51 36 14 80 80 58 23 98 97 78 78 74

6 46 31 9 85 85 53 18 93 92 73 73 69

7 41 26 4 70 70 48 13 98 87 68 68 64

8 36 21

n/a

65 65 43 8 93 82 63 63 59

9 31 16 60 60 38 3 78 77 58 58 54

10 26 11 55 55 33 n/a 73 72 53 53 49

Page 26

FIGURE 21

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR

NON−DIRECT VENT APPLICATIONS

TRANSITION

2”

3”

2”

DO NOT transition

from smaller to larger

pipe in horizontal runs

of exhaust pipe.

EXHAUST

*2”

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

INTAKE

2”

TRANSITION

3”

*2”

EXHAUST INTAKE

FIGURE 22

TRANSITION

SIDE VIEW

2”

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON−DIRECT VENT

APPLICATIONS

(RIGHT HAND DISCHARGE SHOWN)

3”

2”

45°

MAX

45°

MAX

DO NOT transition

from smaller to larger

pipe in horizontal runs

of exhaust pipe.

EXHAUST

12" max.

*2"

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

2”

INTAKE

2”

*2”

EXHAUST

INTAKE

*2"

3”

*2"

Page 27

Intake Piping

The EL195UHE 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 and 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 transition solvent cement or a sheet metal screw

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 guidelines for piping terminations and intake and exhaust piping terminations for direct vent sections. Refer to table

11 for pipe sizes.

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

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

air intake screen to route the intake piping as shown in figure 23 or 24. 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 to either side in the upflow position, and either straight out or downward in the horizontal position.

The air intake piping must not terminate too close to the flooring or a platform. Ensure that the intake air inlet will not be obstructed by loose insulation or other items that may clog the debris screen.

2 − If intake air is drawn from a ventilated attic (figure 25)

or ventilated crawlspace (figure 26) the exhaust vent length must not exceed those listed in table 12. If 3" diameter pipe is used, reduce to 2" diameter pipe at the termination point to accommodate the debris screen.

3 − Use a sheet metal screw to secure the intake pipe to

the connector, if desired.

FIGURE 23

TYPICAL AIR INTAKE PIPE CONNECTIONS

UPFLOW NON−DIRECT

VENT APPLICATIONS

INTAKE

DEBRIS

SCREEN

(Provided)

NOTE − Debris screen and elbow may be rotated, so that screen may be positioned to face forward or to either side.

FIGURE 24

TYPICAL AIR INTAKE PIPE CONNECTIONS

HORIZONTAL NON−DIRECT VENT APPLICATIONS

(Horizontal Right−Hand Air Discharge Application Shown)

INTAKE

DEBRIS

SCREEN

(Provided)

NOTE − Debris screen may be positioned straight out (preferred) or with an elbow rotated to face down.

coupling

PVC pipe

Page 28

CAUTION

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

FIGURE 25

EQUIPMENT IN CONFINED SPACE

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

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

per 1.17kW) per

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

Ventilation Louvers

Inlet Air

(Minimum

12 in.(305mm) Above

attic floor)

Roof Terminated

Exhaust Pipe

Furnace

*Intake Debris

Screen

(Provided)

* See table 12 for maximum vent lengths

FIGURE 26

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

per 1.17kW) per

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

EQUIPMENT IN CONFINED SPACE

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

Roof Terminated

Exhaust Pipe

Furnace

Ventilation

Louvers

(Crawl space)

*Intake Debris Screen Provided)

Inlet Air

(Minimum

12 in.(305mm)

Above crawl

space floor)

Coupling or 3 in. to 2 in.

Transition

(Field Provided)

* See table 12 for maximum vent lengths

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 EL195UHE 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 EL195UHE 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 27 or 28. 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 − See table 13 for maximum allowed exhaust pipe length without insulation in unconditioned space during winter design temperatures below 32°F (0°C). If required exhaust pipe should be insulated with 1/2" (13mm) 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.

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 29

TABLE 13

Maximum Allowable Exhaust Vent Pipe Length Without Insulation In Unconditioned Space For

Winter Design Temperatures Single − Stage High Efficiency Furnace

Winter Design

Temperatures

°F (°C)

Vent Pipe

Diameter

Unit Input Size

045 070 090 110 135

32 to 21

(

0 to −6)

2 in. 26 44 44 24 N/A

2−1/2 in. 18 32 50 58 N/A

3 in. 14 26 38 55 60

20 to 1

(−7 to −17)

2 in 16 28 40 24 N/A

2−1/2 in. 12 20 30 44 N/A

3 in. 9 16 26 32 40

0 to −20

(−18 to −29)

2 in. 10 20 30 24 N/A

2−1/2 in. 8 14 20 32 N/A

3 in. 4 10 16 26 30

1Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook. NOTE − Maximum unisulated vent lengths listed cannot exceed the maximum allowable intake or exhaust vent length listed in table 11.

Page 30

FIGURE 27

VENT TERMINATION CLEARANCES

FOR NON−DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

INSIDE CORNER

DETAIL

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

Fixed

Closed

Operable

Fixed

Closed

Operable

A =

B =

C =

D =

E =

F =

G =

H =

I =

J =

K =

L =

M =

US Installations

Canadian Installations

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

above average snow accumulation.

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

above average snow accumulation.

Clearance above grade, veranda,

porch, deck or balcony

Clearance to window or

door that may be opened

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

1 foot (30cm) above opening

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)

Clearance to permanently

closed window

Vertical clearance to ventilated soffit

located above the terminal within a

horizontal distance of 2 feet (610 mm)

from the center line of the terminal

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-

pliance

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

* 12"

* Equal to or greater than soffit depth.

* 3 feet (.9m)

* 12"

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)

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

(3m) horizontally

6 feet (1.8m)

7 feet (2.1m)

12 inches (305mm)

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.

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

1 foot (30 cm) above opening

7 feet (2.1m)

* 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

*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 31

FIGURE 28

VENT TERMINATION CLEARANCES

FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

INSIDE CORNER

DETAIL

VENT TERMINAL

AIR SUPPLY INLET

AREA WHERE TERMINAL IS NOT PERMITTED

Fixed

Closed

Operable

Fixed

Closed

Operable

A =

B =

C =

D =

E =

F =

G =

H =

I =

J =

K =

L =

M =

US Installations

Canadian Installations

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

above average snow accumulation.

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

above average snow accumulation.

Clearance above grade, veranda,

porch, deck or balcony

Clearance to window or

door that may be opened

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)

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)

Clearance to permanently

closed window

Vertical clearance to ventilated soffit

located above the terminal within a

horizontal distance of 2 feet (610mm)

from the center line of the terminal

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-

pliance

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

* 12"

* 7 feet (2.1m)

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

above the meter / regulator assembly

3 feet (.9m)

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

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)

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

Btuh (3kw), 12 inches (305mm) for

appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

for appliances > 100,000 Btuh (30kw)

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

(3m) horizontally

6 feet (1.8m)

7 feet (2.1m)

12 inches (305mm)

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"

* Equal to or greater than soffit depth

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

* 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)

*12 inches (305mm)

Page 32

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 32.

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 29 through 43 show typical terminations.

1. Intake and exhaust terminations are not required to be in the same pressure zone. You may exit the intake on one side of the structure and the exhaust on another side (figure 30). You may exit the exhaust out the roof and the intake out the side of the structure (figure 31).

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

29).

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 14.

FIGURE 29

UNCONDITIONED

ATTIC SPACE

1/2" (13mm) FOAM

INSULATION IN

UNCONDITIONED

SPACE

SIZE TERMINATION

PIPE PER TABLE 14.

3"(76mm) MAX.

12" (305mm) ABOVE

AVERAGE SNOW ACCUMULATION

3" (76mm) OR

2" (51mm) PVC

PROVIDE SUPPORT

FOR INTAKE AND

EXHAUST LINES

8" (203mm) MIN

Inches(mm)

DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 30

Exhaust

Pipe

Furnace

Exiting Exhaust and Intake Vent

(no common pressure zone)

Inlet Air (Minimum 12 in. 305 MM) above

grade or snow

accumulation

FIGURE 31

Roof T

erminated

Exhaust Pipe

Furnace

Exiting Exhaust and Intake Vent

(no common pressure zone)

Inlet Air

(Minimum 12 in.

305 MM) above

grade or snow

accumulation

TABLE 14

EXHAUST PIPE TERMINATION SIZE REDUCTION

EL195UHE

MODEL

Exhaust Pipe Size

Termination

Pipe Size

*045 and 070

2" (51mm), 2−1/2" (64mm),

3" (76mm)

1−1/2" (38mm)

*090 2" (51mm)

110 2" (51mm) 135

3" (76mm)

2" (51mm)

*EL195UHE−045, −070 and −090 units with the flush mount termination must use the 1−1/2"accelerator supplied with the kit. NOTE − Care must be taken to avoid recirculation of ex-

haust back into intake pipe.

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 33 and 34.

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 33 and 34.

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 33 and 34. In addition, close coupled wall termination kits must be extended for use in this application. See figures 41 and 42. When exhaust and intake piping must be run up an

Page 33

outside wall, the exhaust piping must be terminated with pipe sized per table 14.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 38.

12"

2" (51mm)

Vent Pipe

3" (76mm)

Vent Pipe

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)

12" (305MM) Min.

6" (152MM) Min.

24" (610 MM) Max

9" (227MM) Min.

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

6" (152MM) Max.

6" (152MM) Min.

24" (610 MM) Max

9" (227MM) Min.

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

6" (152MM) Max.

TABLE 15

FIGURE 32

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

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

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

termination is used and flue gases will impinge on the building materials, a corrosion−resistant shield (24 inches square) should be used to protect the wall surface. If optional tee is used, the protective shield is recommended. The shield should be constructed using wood, sheet metal or other suitable material. All seams, joints, cracks, etc. in affected area, should be sealed using an appropriate sealant.

Exhaust pipe 45° elbow can be rotated to the side away from the combustion air inlet to direct exhaust away

from adjacent property. The exhaust must never be directed toward the combustion air inlet.

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

Front View of

Intake and Exhaust

Intake

Exhaust

Intake

Exhaust

Page 34

FIGURE 33

FIELD−SUPPLIED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

See venting table 11 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)

2" (51mm)

Vent Pipe

3" (76mm)

Vent Pipe

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)

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

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

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

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

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

NOTE − FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

TO TERMINATION

SIZE TERMINATION

PER TABLE 14

1/2" (13mm) ARMAFLEX

INSULATION IN UN-

CONDITIONED SPACE

STRAIGHT

APPPLICATION

* WALL

SUPPORT

1/2" (13mm) ARMAFLEX INSULATION

IN UNCONDITIONED SPACE

EXTENDED

APPLICATION

FIGURE 34

FIELD−SUPPLIED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

With INTAKE ELBOW

See venting table 11 for maximum venting lengths with this arrangement.

2" (51mm)

Vent Pipe

3" (76mm)

Vent Pipe

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

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

6" (152MM)

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

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

6" (152MM)

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)

NOTE − FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

TO TERMINATION

SIZE TERMINATION

PER TABLE 14

1/2" (13mm) ARMAFLEX

INSULATION IN UN-

CONDITIONED SPACE

STRAIGHT

APPPLICATION

* WALL

SUPPORT

1/2" (13mm) ARMAFLEX INSULATION

IN UNCONDITIONED SPACE

EXTENDED

APPLICATION

Page 35

FIGURE 35

2" EXTENSION FOR 2" PVC PIPE1" EXTENSION FOR 3" PVC PIPE

1−1/2" ACCELERATOR

(all −45, −070 and −090 units)

FURNACE EXHAUST

PIPE

FURNACE

INTAKE

PIPE

4’’

GLUE EXHAUST

END FLUSH INTO

TERMINATION

FLAT SIDE

FLUSH−MOUNT SIDE WALL TERMINATION

51W11

FIGURE 36

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

Minimum

Above Average

Snow

Accumulation

SHEET METAL STRAP

(Clamp and sheet metal strap must be field installed to support the weight of the termination kit.)

FLASHING

(Not Furnished)

CLAMP

FIELD−PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

1 1/2" (38mm) accelerator

provided on 71M80 & 44W92

kits for EL195UHE045P24B,

070P24B & 070P36B

12” (305mm)

INTAKE

AIR

EXHAUST

VENT

12" (305mm) Min.

above grade or

average snow accumulation.

FIGURE 37

DIRECT VENT CONCENTRIC WALL TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

INTAKE

AIR

INTAKE

AIR

INTAKE

AIR

OUTSIDE

WALL

GRADE

CLAMP

(Not Furnished)

FIELD−PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

EXHAUST

VENT

1−1/2" (38mm) accelerator

provided on 71M80 & 44W92

kits for EL195UHE045P24B,

070P24B & 070P36B

EXHAUST

VENT

FIGURE 38

EXHAUST

VENT

INTAKE

AIR

5−1/2"

(140mm)

Front View

12"

(305mm)

(127mm)

18" MAX.

(457mm)

EXHAUST VENT

INTAKE

AIR

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

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

Inches (mm)

Side View

12" (305mm) Min.

above grade or

average snow

accumulation.

optional intake elbow

FIGURE 39

1/2" (13mm) Foam Insulation

in Unconditioned Space

EXHAUST VENT

INTAKE AIR

OUTSIDE WALL

EXHAUST VENT

INTAKE

AIR

Front View

Top View

DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

6 (152mm) MIN.

SIZE

TERMINATION

PIPE PER

TABLE 14.

FIELD−

PROVIDED

REDUCER MAY

BE REQUIRED

TO ADAPT

LARGER VENT

PIPE SIZE TO

TERMINATION

FIGURE 40

EXHAUST VENT

INTAKE

AIR

Front View

SIZE

TERMINATION

PIPE PER

TABLE 14.

Top View

1/2" (13mm) Foam Insulation

in Unconditioned Space

EXHAUST VENT

INTAKE AIR

OUTSIDE WALL

DIRECT VENT WALL TERMINATION KIT

(22G44 or 44J40)

8" (206mm) MIN.

FIELD−

PROVIDED

REDUCER MAY

BE REQUIRED

TO ADAPT

LARGER VENT

PIPE SIZE TO

TERMINATION

Page 36

FIGURE 41

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

1/2” (13 mm)

FOAM INSULATION

(Field−Furnished)

5” (127 mm)

5−1/2”

(140 mm)

EXHAUST

AIR

INTAKE

AIR

GRADE

12”

(305 mm)

INTAKE

AIR

EXHAUST

AIR

GRADE

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

WALL SUPPORT*

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

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

WALL TERMINATION KITS (CLOSE−COUPLE)

EXTENDED VENT FOR GRADE CLEARANCE

2 inch (51 mm) 22G44 (US)

3 inch (76 mm) 44J40 (US)

6” (152 mm)

Maximum

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

between the end of the exhaust pipe and intake pipe

8” (203 mm) Min.

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

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

FIELD−PROVIDED

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

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

FIGURE 42

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

1/2” (13 mm)

FOAM INSULATION

(Field−Furnished)

5” (127 mm)

5−1/2”

(140 mm)

EXHAUST

AIR

INTAKE

AIR

GRADE

12”

(305 mm)

INTAKE

AIR

EXHAUST

AIR

GRADE

WALL SUPPORT*

12” (305 mm) Minimum

Above Grade or Average

Snow Accumulation

WALL TERMINATION KITS (CLOSE−COUPLE)

EXTENDED VENT FOR GRADE CLEARANCE

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

See Installation Instructions for additional information.

6” (152 mm)

Maximum

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

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

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

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

FIELD−PROVIDED

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

Page 37

EL195UHE DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

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.

FIGURE 43

3" − 8"

(76mm−

203mm)

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

ALTERNATE

INTAKE PIPE

INSULATION (optional)

EXTERIOR

PORTION OF

CHIMNEY

INSULATE TO FORM

SEAL

SHEET

METAL TOP

PLATE

*SIZE TERMINATION PIPE PER TABLE 14.

Minimum 12" (305MM)

above chimney top

plate or average snow

accumulation

8" − 12"

(203mm − 305mm)

3"−8"

(76mm−203mm)

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 44 through 47 show typical terminations.

1. Exhaust piping must terminate straight out or up as shown. The termination pipe must be sized as listed in table 14.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 45.

FIGURE 44

NON−DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

UNCONDITIONED

ATTIC SPACE

3" (76mm) OR

2" (51mm) PVC

PROVIDE SUPPORT

FOR EXHAUST LINES

12" (305mm) ABOVE AVE.

SNOW

ACCUMULATION

SIZE TERMINATION

PIPE PER TABLE

14.

1/2" (13mm) FOAM

INSULATION

FIGURE 45

1/2" (13mm) ARMAFLEX

INSULATION IN

UNCONDITIONED SPACE

PVC REDUCER

1/2" (13mm)

ARMAFLEX

INSULATION

NON−DIRECT VENT FIELD SUPPLIED WALL TERMINATION OR

(15F74) WALL TERMINATION KIT

SIZE TERMINATION

PIPE PER TABLE 14.

FIELD−PROVIDED

REDUCER MAY

BE REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE

TO TERMINATION

12" MIN.

(305mm)

Above Grade or

average snow

accumulation

12" (305mm) MAX. for 2" (51mm) 20" (508mm) MAX. for 3" (76mm)

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 46. When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow.

FIGURE 46

12" (305mm)

ABOVE GRADE OR

AVERAGE SNOW ACCUMULATION

UNCONDITIONED

SPACE

1/2" (13mm) FOAM

INSULATION

1/2" (13mm) FOAM

INSULATION IN

UNCONDITIONED

SPACE

*WALL SUPPORT

OUTSIDE WALL

SIZE TERMINATION PIPE PER TABLE 14.

FIELD−PROVIDED

REDUCER MAY BE

REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE TO

TERMINATION

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

greater than 24" but less than 48".

12" (305mm) MAX. for 2" (51mm) 20" (508mm) MAX. for 3" (76mm)

NON−DIRECT VENT FIELD SUPPLIED WALL TERMINATION

EXTENDED OR (15F74) WALL TERMINATION VENT PIPE

EXTENDED

6" (152mm)

Max

Page 38

FIGURE 47

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

EXTERIOR

PORTION OF

CHIMNEY

INSULATE TO FORM

SEAL

SHEET

METAL TOP

PLATE

SIZE TERMINATION

PIPE PER TABLE 14.

EL195UHE NON−DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

Minimum 12" (305MM)

above chimney top

plate or average snow

accumulation

Condensate Piping

This unit is designed for either right- or left-side exit of condensate piping in upflow applications. In horizontal applications, the condensate trap must extend below the unit. An 8" service clearance is required for the condensate trap. Refer to figures 48 and 49 for condensate trap locations. Figure 55 shows trap assembly using 1/2" PVC or 3/4" PVC.

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.

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 48)

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 55.

4 − Install drain trap using appropriate PVC fittings, glue

all joints. Glue the provided drain trap as shown in figure 55. Route the condensate line to an open drain.

Condensate line must maintain a 1/4" downward slope from the furnace to the drain.

FIGURE 48

CONDENSATE TRAP AND PLUG LOCATIONS

(Unit shown in upflow position)

NOTE − In upflow applications where side return air filter is installed on same side as the condensate trap, filter rack must be installed beyond condensate trap or trap must be re−located to avoid interference.

Trap

(same on

right side)

Plug

(same on left side)

1−1/2 in.

5 − Figures 50 and 51 show 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 52, 53 and 54. Upflow furnace (figure 53) − In upflow furnace applications the field provided vent must be a minimum 1" to a maximum 2" length above the condensate drain outlet connection. Any length above 2" may result in a flooded heat exchanger if the combined primary drain line were to become restricted. Horizontal furnace (figure 54) − In horizontal furnace applications the field provided vent must be a minimum 4" to a maximum 5" length above the condensate drain outlet connection. Any length above 5" may result in a flooded heat exchanger if the combined primary drain line were to become restricted.

NOTE − In horizontal applications it is recommended to install a secondary drain pan underneath the unit and trap assembly.

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.

CAUTION

Do not use copper tubing or existing copper conden- sate lines for drain line.

6 − If unit will be started immediately upon completion of

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

Page 39

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. Heating 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.

FIGURE 49

CONDENSATE TRAP LOCATIONS

(Unit shown in upflow position with remote trap)

*5’ max.

To Drain

PVC Pipe Only

Field Provided Vent

Min. 1" Above Condensate

Drain Connection

1" Min.

Trap Can Be Installed a

Maximum 5’ From Furnace

*Piping from furnace must slope down a minimum of 1/4" per ft. toward trap.

2" Max.

FIGURE 50

EL195UHE With Evaporator Coil Using A Separate Drain

Field−Provided Vent

(1" min. to 2" Max. above

condensate drain connection)

Drain

Condensate trap

and evaporator coil

drain separately as

shown.

Condensate

Drain Connection

FIGURE 51

EL195UHE with Evaporatoir Coil Using a Separate Drain

(Unit shown in horizontal left−hand discharge position)

Condensate Drain

Connection

Field−Provided Vent

(4" min. to 5" Max. above

condensate drain connection)

*Piping from furnace and evaporator coil must slope down a minimum of 1/4" per ft. toward trap.

5’ max.

PVC Pipe Only

4”min

5”max

Evaporator

Coil

Drain Pan

Page 40

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.

FIGURE 52

Condensate Trap With Optional Overflow Switch

Field−Provided Vent

(Upflow/Furnace 1" Min. to 2" Max.

Horizontal Furnace 4" Min. to 5" Max. above

condensate drain connection)

Furnace Condensate

Drain Connection

From Evaporator Coil

To Drain

Optional

Overflow Switch

FIGURE 53

EL195UHE with Evaporator Coil Using a Common Drain

Field−Provided Vent

(1" min. to 2" Max. above

condensate drain connection)

Evaporator

Drain Line

Vent Required

Condensate

Drain Connection

FIGURE 54

Condensate Drain

Connection

EL195UHE with Evaporator Coil Using a Common Drain

(Unit shown in horizontal left−hand discharge position)

Field−Provided Vent

(4" min. to 5" Max. above

condensate drain connection)

*Piping from furnace and evaporator coil must slope down a minimum of 1/4" per ft. toward trap.

5’ max.

PVC Pipe Only

4”min

5”max

Evaporator

Coil

Drain Pan

Page 41

FIGURE 55

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

Adapter 1/2 inch slip X

1/2 inch mpt (Not Furnished)

Drain Trap

Assembly

(Furnished)

Vent

Drain Trap Clean Out

5 Feet

Maximum

Coupling 1/2 inch slip X slip

(Not Furnished)

90° Elbow 1/2 inch PVC

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

Condensate Drain

Connection In Unit

(178)

Drain Assembly for 1/2 inch Drain Pipe

90° Elbow

3/4 inch PVC

(Not Furnished)

Coupling 3/4 inch slip X slip

(Not Furnished)

Drain

90° Elbow

3/4 inch PVC

(Not Furnished)

90° Street Elbow

1/2 inch PVC

Drain

90° Elbow

1/2 inch PVC

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

Drain Assembly for 3/4 inch Drain Pipe

90° Street Elbow

1/2 inch PVC

(Not Furnished)

Condensate Drain

Connection In Unit

Adapter 1/2 inch slip X

1/2 inch mpt (Not Furnished)

Condensate Drain

Connection In Unit

Vent

Drain

Condensate Drain

Connection In Unit

Drain Trap Assembly with 3/4 inch Piping

Vent

Drain

(Furnished)

Optional Condensate Drain Connection

Optional Drain Piping From Trap

Drain Trap Assembly

(Furnished)

Drain Trap Assembly with 1/2 inch Piping

Drain Trap Assembly with 3/4 inch Piping

1/2 inch

3/4 inch

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

Trap

Page 42

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 po wer 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 EL195UHE 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:

EL195UHE 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 56)

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 access panel. 6 − Move gas valve switch to OFF. See figure 56. 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 56.

FIGURE 56

GAS VALVE SHOWN IN ON POSITION

MANIFOLD

PRESSURE

OUTLET

PORT

INLET

PRESSURE

PORT

MANIFOLD PRESSURE ADJUSTMENT SCREW

(under barbed fitting)

9 − Replace the 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 access panel.

4 − Move gas valve switch to OFF.

5 − Replace the 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 43

IV−HEATING SYSTEM SERVICE CHECKS

A−C.S.A. Certification

All units are C.S.A. design certified without modifications. Refer to the EL195UHE Operation and Installation Instruction Manual Information.

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 0.5 psig (14" W.C.). See figure 57.

FIGURE 57

MANUAL MAIN SHUT−OFF

VALVE WILL NOT HOLD

NORMAL TEST PRESSURE

CAP

FURNACE

ISOLATE

GAS VALVE

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

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.

WARNING

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

D−Testing Gas Supply Pressure Gas Flow (Approximate)

TABLE 16

GAS METER CLOCKING CHART

EL195

Unit

Seconds for One Revolution

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 11 0 136 272

−090 41 82 102 204

−110 33 66 82 164

−135 27 54 68 136

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

Furnace should operate 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 16. If manifold pressure matches table 17 and rate is incorrect, check gas orifices for proper size and restriction. Remove temporary gas meter if installed.

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

Supply Pressure Measurement

When testing supply gas pressure, use the 1/8" N.P.T. plugged tap located on the gas valve to facilitate test gauge connection. See figure 7. 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 other units operating. Supply pressure must fall within range listed in table 17.

Manifold Pressure Measurement

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

17.

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 17

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

Unit Fuel

Manifold

Pressure

Supply Line

All Nat 3.5 4.5 − 10.5

All LP/Propane 10.0 11.0 − 13.0

Page 44

E−Proper Combustion

Furnace should operate minimum 15 minutes with correct manifold pressure and gas flow rate before checking combustion. Take combustion sample beyond the flue outlet and compare to the tables below.

TABLE 18

Unit

CO2%

For Nat

CO2%

For LP

All 7.2 − 8.2 8.6 − 9.6

The maximum carbon monoxide reading should not exceed 50 ppm.

F−High Altitude

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

Units installed at altitude of 4501 − 10,000 feet (1373 to 3048 m) may require a pressure switch change which can be ordered separately. Table 19 lists conversion kit and pressure switch requirements at varying altitudes.

The combustion air pressure switch is factory−set and requires no adjustment.

TABLE 19

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

Unit

Natural to

LP/Propane

High Altitude

Natural Burner

Orifice Kit

High Altitude

LP/Propane Burner

Orifice Kit

High Altitude Pressure Switch

0 − 7500 ft

(0 − 2286m)

7501 − 10,000 ft

(2286 − 3038m)

7501 − 10,000 ft

(2286 − 3038m)

4501 − 7500 ft

(1373 − 2286m)

7501 −10,000 ft

(2286 − 3048m)

−045

*69W73 73W37 *68W68

No Change 80W60

−070 80W66 80W59

−090 80W65 80W59

−110 80W66 80W59

−135 80W65 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 45

G− 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 58. 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 58. This voltage should be in the range of 97 to 132 Vac

TABLE 20

Furnace Status

Measurement VAC

Expected Maximum

Power On Furnace Idle 0.3 2

CAI / Ignitor Energized 0.75 5

Indoor Blower Energized Less than 2 10

CHECK VOLTAGE BETWEEN LINE NEUTRAL

AND LOW VOLTAGE C" TERMINAL

Red LED

Recall

Red LED

Recall

CHECK VOLTAGE BETWEEN LINE HOT

AND LINE NEUTRAL

FIGURE 58

Page 46

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 59)

Temperature rise for EL195UHE 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.

FIGURE 59

TEMPERATURE RISE

Supply Duct Temperature

Return Duct Temperature

Temperature Rise =

SUPPLY

AIR

Temperatures

RETURN AIR

C−External Static Pressure

1 − Tap locations shown in figure 60. 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.

FIGURE 61

EXTERNAL STATIC PRESSURE

Supply Duct Static

Return Duct Static +

Total Duct Static = (dry coil)

Duct Static

Supply Air

Return Air

High +"

Low −"

−

D−Blower Speed Taps

Blower speed tap changes are made on the integrated control. See figure 3 or 58. 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 47

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 21 lists recommended filter sizes.

TABLE 21

Furnace

Cabinet Width

Filter Size

Side Return Bottom Return

17−1/2" 16 X 25 X 1 (1) 16 X 25 X 1 (1)

21" 16 X 25 X 1 (1) 20 X 25 X 1 (1)

24−1/2" 16 X 25 X 1 (2) 24 X 25 X 1 (1)

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 using a true RMS meter on the blow-

er motor with blower access panel in place. See figure

62. Unit Nameplate__________Actual__________

FIGURE 62

kVAr

kWh

COMMV3V1

OFF

W 3

Check Motor Amp Draw

True RMS Meter

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 2 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 − Disconnect combustion air intake pipe. It may be nec-

essary to cut the existing pipe to remove burner box

assembly. 8 − 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.

9 − Loosen the clamps to the flexible exhaust coupling. 10 − Disconnect condensate drain line from the cold end

header box. 11 − Disconnect condensate drain tubing from flue collar.

Remove screws that secures the flue collar into place.

Remove flue collar. It may be necessary to cut the exit-

ing exhaust pipe for removal of the fitting.

Page 48

12 − Mark and disconnect all combustion air pressure tub-

ing from cold end header collector box.

13 − Mark and remove wires from pressure switch assemb-

ly. Remove the assembly. Keep tubing attached to pressure switches.

14 − Disconnect the plug from the combustion air inducer.

Remove two screws which secure combustion air inducer to collector box. Remove combustion air induc-

er assembly. Remove ground wire from vest panel. 15 − Disconnect the condensate drain line. 16 − Remove cold end header box. 17 − Remove electrical junction box from the side of the fur-

nace. 18 − 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. 19 − Remove the primary limit from the vestibule panel. 20 − Remove two screws from the front cabinet flange at

the blower deck. Spread cabinet sides slightly to allow

clearance for removal of heat exchanger. 21 − Remove screws along vestibule sides and bottom

which secure vestibule panel and heat exchanger as-

sembly to cabinet. Remove two screws from blower

rail which secure bottom heat exchanger flange. Re-

move heat exchanger from furnace cabinet.

22 − Back wash heat exchanger with soapy water solution

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

(135°C) .

23 − Thoroughly rinse and drain the heat exchanger. Soap

solutions can be corrosive. Take care to rinse entire

assembly. 24 − Reinstall heat exchanger into cabinet making sure that

the clamshells of the heat exchanger assembly is en-

gaged properly into the support bracket on the blower

deck. Remove the indoor blower to view this area

through the blower opening. 25 − Re-secure the supporting screws along the vestibule

sides and bottom to the cabinet. 26 − Reinstall cabinet screws on front flange at blower

deck. 27 − Reinstall the primary limit on the vestibule panel. 28 − Route heating component wiring through hole in blow-

er deck and reinsert strain relief bushing. 29 − Reinstall electrical junction box.

30 − Reinstall the cold end header box. 31 − Reinstall the combustion air inducer. Reconnect the

plug to the wire harness.

32 − Reinstall pressure switches and reconnect pressure

switch wiring.

33 − Carefully connect combustion air pressure switch

tubing from pressure switches to proper ports on cold end header collector box.

34 − Reconnect condensate drain line to the cold end

header box.

35 − Use securing screws to reinstall flue collar to the top

cap on the furnace. Reconnect exhaust piping and exhaust drain tubing.

36 − Replace flexible exhaust adapter on combustion air in-

ducer and flue collar. Secure using two existing hose clamps.

37 − Reinstall burner box assembly in vestibule area. Se-

cure burner box assembly to vestibule panel using four existing screws. Make sure burners line up in

center of burner ports

38 − Reconnect flame roll−out switch wires. 39 − Reconnect sensor wire and reconnect 2−pin plug from

ignitor.

40 − Reinstall gas valve manifold assembly. Reconnect

gas supply line to gas valve. 41 − Reconnect the combustion air intake pipe. 42 − Reinstall burner box cover. 43 − Reconnect wires to gas valve. 44 − Replace the blower compartment access panel. 45 − Reconnect gas supply piping. Turn on power and gas

supply to unit. 46− Follow lighting instructions on unit nameplate to light

and operate furnace for 5 minutes to ensure the fur-

nace is operating properly. 47− Check all piping connections, factory and field, for gas

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

48− Replace heating compartment access panel.

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.

Page 49

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 wires 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 − Mark and disconnect sensor wire from the sensor. Dis-

connect wires from flame rollout switches.

6 − Disconnect combustion air intake pipe. It may be nec-

essary to cut the existing pipe to remove burner box assembly.

7 − Remove four screws which secure burner box assem-

bly to vest panel. Remove burner box from the unit.

8 − 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.

9 − Reinstall the burner box assembly using the existing

four screws. Make sure that the burners line up in the center of the burner ports.

10 − Reconnect the sensor wire and reconnect the 2−pin

plug to the ignitor wiring harness. Reconnect wires to flame rollout switches.

11 − Reinstall the gas valve manifold assembly. Reconnect

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

er box cover. 12 − Reconnect wires 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 heating compartment access panel.

Page 50

VII−WIRING DIAGRAM AND SEQUENCE OF OPERATION

1 − Line voltage is applied to L1 and N. the T1 low voltage transformer is energized, and line voltage is applied to B3 indoor blower.

2 − S47 rollout switch(es) must be closed in order for 24V from transformer to be output on integrated control "R" to power thermostat.

3 − When there is a call for heat, W1 of the thermostat energizes W of the furnace control with 24VAC.

4 − A92 integrated control runs a self−check. S10 primary limit and S21 secondary limit contacts are found to be closed. Call for heat can continue. 5 − A92 integrated control energizes B6 combustion air inducer. S18 combustion air pressure switch closes . Once S18 closes, a 15−second

pre−purge follows.

6 − A92 integrated control energizes R33 ignitor. A 20−second warm−up period begins.

7 − GV1 gas valve opens for a 4−second trial for ignition

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

9 − After 30−second delay (from flame sensed), A92 integrated control applies 24VAC to Heat speed of B3 indoor blower.

10 − When heat demand is satisfied, W1 of the indoor thermostat de−energizes W of A92integrated control which de−energizes GV1 gas valve.

B6 combustion air inducer continues a 5−second post−purge period, and B3 indoor blower completes a selected OFF time delay.

Page 51

Troubleshooting: Heating Sequence of Operation

HEATING SEQUENCE OF OPERATION

NORMAL HEATING MODE

ABNORMAL HEATING MODE

CONTROL SELF−CHECK OKAY?

BURNER OFF?

NORMAL OPERATION:

LED SLOW FLASH

YES

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.

POWER ON

IS POLARITY CORRECT?

ROLLOUT SWITCH CLOSED?

THERMOSTAT CALLS FOR HEAT:

LED SLOW FLASH

IS COMBUSTION AIR

PRESSURE SWITCH OPEN?

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.

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 11 − PRESSURE

SWITCH CLOSED.

GAS VALVE OFF COMBUSTION AIR

INDUCER OFF. INDOOR BLOWER

OFF WITH DELAY.

(Sequence holds until pressure switch

opens or thermostat resets control.)

YES

IS VOLTAGE

ABOVE 70 VOLTS?

LED FLASHES CODE 13 − LOW LINE VOLTAGE.

CONTROL WILL NOT RESPOND TO A CALL FOR

HEATING UNTIL VOLTAGE RISES ABOVE 75 VOLTS.

IS COMBUSTION AIR INDUCER

ENERGIZED?

HAS COMBUSTION AIR PRESSURE

SWITCH CLOSED IN 2.5 MINUTES?

YES

LED FLASHES CODE 9 − PRESSURE SWITCH FAILED

TO CLOSE OR OPENED DURING HEAT DEMAND.

PRESSURE SWITCH IS IN WATCHGUARD MODE. GAS

VALVE OFF. COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF WITH DELAY. IS 5-MINUTE

RESET PERIOD COMPLETE?

PRIMARY LIMIT SWITCH. CLOSED?

YES

CONTINUED NEXT PAGE

LED FLASHES CODE 7 − PRIMARY

LMIT OPEN. COMBUSTION AIR

INDUCER OFF.I NDOOR BLOWER ON

YES

IS THERE A PROPER GROUND?

YES

LED FLASHES CODE 2 − IMPROPER

GROUND.

YES

Page 52

Troubleshooting: Heating Sequence of Operation (Continued)

HEATING SEQUENCE CONTINUED

NORMAL HEATING MODE ABNORMAL HEATING MODE

FLAME RECTIFICATION CURRENT

CHECK. CAN FLAME BE PROVEN WITHIN

4 SECONDS AFTER GAS VALVE OPENS?

(0.5 microamps)

FLAME PRESENT?

INDOOR BLOWER ON

AFTER 30−SECOND DELAY

PRIMARY LIMIT SWITCH CLOSED?

COMBUSTION AIR PRESSURE

SWITCH CLOSED?

LED FLASHES CODE 4 − LOW

FLAME SIGNAL.

(Does not affect operation of control)

LED FLASHES CODE 7 − PRIMARY LIMIT OPEN

GAS VALVE DE−ENERGIZED.

COMBUSTION AIR INDUCER DE−ENERGIZED.

INDOOR BLOWER ON UNTIL SWITCH CLOSES.

LIMIT SWITCH CLOSED?

GAS VALVE DE−ENERGIZED.

COMBUSTION AIR INDUCER ON.

INDOOR BLOWER OFF WITH DELAY

HAS CAI SWITCH CLOSED IN 2.5 MINUTES?

15-SECOND COMBUSTION AIR INDUCER PREPURGE

INITIATED BY CLOSED PRESSURE SWITCH.

YES

IGNITOR WARM-UP −− 20 SECONDS.

YES

FLAME STABILIZATION PERIOD.

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

INDOOR BLOWER OFF.

HAS CONTROL FAILED TO SENSE FLAME FOR

FIVE CONSECUTIVE TRIES DURING A SINGLE

HEAT DEMAND?

LED SIGNAL WATCHGUARD FAILURE CODE

WATCHGUARD MODE. GAS VALVE OFF.

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF WITH DELAY

IS 60-MINUTE RESET PERIOD COMPLETE?

YES

4 SECONDS

YES

HAS CONTROL RESET IGNITION

SEQUENCE FOUR TIMES?

FLAME SIGNAL 1.5 MICROAMPS OR GREATER?

YES

ROLLOUT SWITCH CLOSED?

LED FLASHES CODE 8 − ROLLOUT SWITCH OPEN.

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

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

YES

THERMOSTAT DEMAND SATISFIED.

LED SLOW FLASH.

COMB. AIR INDUCER CONTINUES 5-SECOND

POST PURGE AFTER T’STAT DEMAND IS SATISFIED.

INDOOR AIR BLOWER COMPLETES SELECTED OFF"

DELAY BEFORE SHUTTING OFF.

YES

5-MINUTE PRESSURE SWITCH

WATCHGUARD MODE.

YES

IS VOLTAGE ABOVE 70 VOLTS?

LED FLASHES CODE 13 −

LOW LINE VOLTAGE.

ONCE VOLTAGE IS ABOVE

75 VOLTS, HEATING

SEQUENCE RESTARTS.

YES

HAS PRIMARY LIMIT RESET

TIME EXCEEDED 3 MINUTES?

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-

RIOD STARTS AT

TIME LIMIT CLOSES.

IS 60−MIN. PERIOD

COMPLETE?

YES

4-SECOND TRIAL FOR IGNITION.

GAS VALVE OPENS. IGNITOR ENERGIZED FOR

FIRST 3 SECONDS OF THE TRIAL.

LED FLASHES

CODE 10

1 HR PRESSURE

SWITCH

WATCHGUARD

MODE

HAS PRESSURE SWITCH OPENED 5

TIMES IN SAME HEAT DEMAND

YES

Page 53

Troubleshooting: Cooling Sequence of Operation

COOLING SEQUENCE OF OPERATION

NORMAL COOLING MODE ABNORMAL COOLING MODE

IGNITION CONTROL MAIN POWER ON.

CONTROL SELF DIAGNOSTIC CHECK.

IS CONTROL OPERATING NORMALLY?

YES

LED FLASHES CODE 1 POLARITY REVERSED

CONTROL WILL CONTINUE TO CALL FOR COOLING IN

THIS CONDITION.

POWER ON

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.

YES

IS POLARITY CORRECT?

ROLLOUT SWITCH MONITORED CONTINUOUSLY.

IS ROLLOUT SWITCH CLOSED?

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)

COMPRESSOR OFF.

THERMOSTAT OPENS.

SYSTEM FAN AND EAC TERM. OFF

WITH 45-SECOND DELAY.

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.

IS VOLTAGE

ABOVE 70 VOLTS?

LED FLASHES CODE 13 LOW VOLTAGE. CONTROL

WILL CONTINUE TO CALL FOR COOLING

IN THIS CONDITION.

YES

IS THERE A PROPER GROUND?

YES

LED FLASHES CODE 2 IMPROPER GROUND

CONTROL WILL CONTINUE TO CALL FOR COOLING

IN THIS CONDITION.

Page 54

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.

THERMOSTAT OPENS.

SYSTEM FAN SWITCHED TO COOL SPEED.

EAC TERM. REMAINS ON.

THERMOSTAT OPENS.

MANUAL FAN SELECTION MADE AT THERMOSTAT.

CONTROL (G) ENERGIZES SYSTEM FAN AT FAN

SPEED. EAC TERM. ENERGIZED.

YES

SYSTEM FAN SWITCHES TO HEAT SPEAD AFTER 30

SECOND DELAY. EAC AND HUM TERMINALS REMAIN ON.

SYSTEM FAN CONTINUES FAN SPEED WITHOUT

INTERRUPTION. EAC TERMINAL REMAIN ON.

HUM TERMINALS ARE ENERGIZED WITH

COMBUSTION AIR BLOWER.

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

SWITCHES TO FAN SPEED AFTER BLOWER

OFF DELAY. EAC CONTINUES WITHOUT

INTERUPTION.

Lennox EL195UHE, EL195UH045XE36B, EL195UH110XE60C, EL195UH135XE60D, EL195UH070XE36B Unit Information

Specifications and Main Features

Frequently Asked Questions

User Manual