December 15, 2019

G17Q6-125 Furnace Page 1994 Lennox Industries Litho G20

G17Q6-125 Furnace Page 1994 Lennox Industries Litho G20 - page 1

LENNOXOEMPARTS.COM

Page 1

E

1994 Lennox Industries Inc.

Litho U.S.A.

Corp. 9418–L9

G20

Service Literature

Revised 04–2003

G20 SERIES UNITS

I−INTRODUCTION/APPLICATION

G20 and G20E series units are mid−efficiency gas fur

naces manufactured with Duracurvet heat exchangers

formed of either cold rolled or aluminized steel. G20 units

come in heating capacities of 50,000 to 150,000 Btuh and

cooling applications up to 6 tons. Refer to Engineering

Handbook for proper sizing.

Units are factory supplied for use with natural gas. A kit is

available for conversion to LPG operation. The G20 unit is

equipped with a standing pilot. G20E units use an elec

tronic ignition. G20X units use electronic ignition and meet

the California Nitrogen Oxides (NO

x

) Standards and Cali

fornia Seasonal Efficiency requirements. G20X series

units use only natural gas. All units use a redundant gas

valve to assure safety shut−off as required by A.G.A.

Featured on G20 series is a burner box damper assembly

located on the intake side of the burners. A damper door in

the burner box shuts during unit off cycles to retain heat in

the unit. A damper prove switch ensures that damper is

open before gas valve is energized. Since the G20 fur

naces have atmospheric burners there is no induced draft

motor. All G20 units use a draft diverter which allows the

use of standard single wall vent connectors.

This manual is divided into sections which discuss the ma

jor components, electronic ignition module, maintenance

and operation sequences.

All specifications in this manual are subject to change.

SPECIFICATIONS

(continued on next page)

Model No.

Input Btuh

Output Btuh

*A.F.U.E.

Flue connection (in. diameter)

Temperature rise range

High static certified by A.G.A.(in wg.)

Gas piping size

I.P.S. (in.)

Blower wheel nominal diameter x width (in.)

Blower motor hp

Number and size of filters (in.)

Electrical characteristics

Natural

LPG

**Optional LPG Conversion Kit

G20Q2−50

G20Q3−50

G20Q3−75

G20Q4−75

G20Q3/4−100

50,000

40,000

77.0%

4

25−55

.50

1/2

1/2

9 x 7

1/4

120 volts  60 hertz  1 phase (less than 12 amps)  All Models

1, 1−1/2, 2

Tons of cooling (add−on)

LB−62384DA

50,000

40,000

77.0%

77.0%

77.0%

78.0%

75,000

59,000

75,000

60,000

100,000

79,000

4

4

4

5

25−55

35−65

25−55

35−65

.50

.50

.50

.50

1/2

1/2

1/2

1/2

1/2

1/2

1/2

1/2

10 x 7

10 x 7

10 x 8

10 x 8

1/3

1/3

1/2

1/2

(1) 16 x 25 x 1

2−1/2 or 3

3−1/2 or 4

3, 3−1/2, 4

2−1/2 or 3

*Annual Fuel Utilization Efficiency based on D.O.E. test procedures and according to F.T.C. labeling requirements. Isolated combustion system rating for non−weatherized furnaces.

**LPG kit must be ordered extra for field changeover.





LENNOXOEMPARTS.COM Page 1 E 1994 Lennox Industries Inc. Litho U.S.A. Corp. 9418–L9 G20 Service Literature Revised 04–2003 G20 SERIES UNITS I−INTRODUCTION/APPLICATION G20 and G20E series units are mid−efficiency gas fur naces manufactured with Duracurvet heat exchangers formed of either cold rolled or aluminized steel. G20 units come in heating capacities of 50,000 to 150,000 Btuh and cooling applications up to 6 tons. Refer to Engineering Handbook for proper sizing. Units are factory supplied for use with natural gas. A kit is available for conversion to LPG operation. The G20 unit is equipped with a standing pilot. G20E units use an elec tronic ignition. G20X units use electronic ignition and meet the California Nitrogen Oxides (NO x ) Standards and Cali

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