Service Literature G26 SERIES UNITS - Heating & …

1 1G26 FURNACEYAG26 HEAT EXCHANGE ASSEMBLYC ombustion Process:1. A call for heat starts the combustion air Outdoor air is drawn through pipe into the burnercompartment where it mixes with gas in a con-ventional style inshot The SureLight ignition system lights the Combustionproductsaredrawndownwardthroug h the heat exchanger. Heat is extractedas indoor air passes across the outside surfaceof the Latent heat is removed fromthe combustionproducts as air passes through the coil. Conden-sate (water) is formed as the combustion prod-ucts As the combustion products exit the coil, con-densate is collected and drained Combustion products are pulled fromthe heatexchanger and forced into the 1 1997 Lennox Industries 9721-L11G26 Service LiteratureRevised 07-2001G26 SERIES UNITSG26 SERIES UNITS are high-efficiency upflow gas furnaces manufactured withDuralokPlustaluminized steel clamshell-type heat exchangers.

2 G26 unitsare available in Heating capacities of 50,000 to 125,000 Btuh and coolingapplications up to 5 tons. Refer to Engineering Handbook for proper are factory equipped for use with natural gas. A kit is available for con-version to LPG operation. G26-1 and -2 model UNITS use electronic (intermit-tent pilot) ignition. G26-3, -4, -5 and -6 model UNITS feature the Lennox Sur-eLightTsilicon nitride ignition system. Each unit meets the California Nitro-gen Oxides (NOx) Standards and California Seasonal Efficiency require-ments without modification. All UNITS use a redundant gas valve to assuresafety shut-off as required by or contained in this manual is intended for use by qualified servicetechnicians only. All specifications are subject to change. Procedures out-lined in this manual are presented as a recommendation only and do not su-persede or replace local or state codes.

3 In the absence of local or statecodes, the guidelines and procedures outlined in this manual (except wherenoted) are recommended 2 SPECIFICATIONSM odel Btuh (kW)50,000 ( )75,000 ( )Output Btuh (kW)46,000 ( )47,000 ( )70,000 ( )69,000 ( ) Seasonal Exhaust pipe connection (PVC) diameter in. (mm)2 (51) Intake pipe connection (PVC) diameter in. (mm)2 (51)Condensate drain connection (PVC) in. (mm)1/2 ( )Temperature rise range _F (_C)40-70 (22-39)30-60 (17-33)40-70 (22-39)20-50 (11-28)High static certified by ( ) in. wg. (Pa).50 (125) or x 710 x 811-1/2 x 9 Blowerwheelnominaldiameter x widthmm254 x 178254 x 203292 x 229 Blower motor output hp (W)1/5 (149)1/3 (249)3/4 (560)NominalcoolingTons1 to 22 to 33-1/2 to 5 Nominalcoolingthat can be to to to weight lbs. (kg) 1 package150 (68)157 (71)157 (71)182 (83)Electrical characteristics120 volts 60 hertz 1 phase (all models) (less than 12 amps)bOptional Accessories (Must Be Ordered Extra)bLPG/Propane kit (optional)65K27(all models)Filter and Filter Rack Kits}No.

4 & size of filters - in. (mm)Single(44J20)Ten Pack(66K61)(1) 14 x 25 x 1 (356 x 635 x 25)Single(44J21)Ten Pack(66K62)(1) 20 x 25 x 1(508 x 635 x 25)Concentric Vent/Intake Air/Roof Termination Kit (optional)60G77 1 1/2 inch (38 mm) Vent/IntakeAirRoof2 inch (51 mm)15F75 Vent/IntakeAirRoofTermination Kit (optional) vent size3 inch (76 mm)44J41 Vent/Intake Air WallTerminationKit(optional) ventsize2 inch (51 mm)15F74(ringkit) 22G44(closecouple) 30G28(WTKclosecouple)30G79(WTKX close couple with extension riser)TerminationKit(optional) ventsize3 inch (76 mm)44J40(close couple) or81J20(WTK close couple)TwinningKitsNon-continuous low speed64H88(all models)TwinningKits(optional)Continuous low speed35J93(all models)Continuous Low Speed Blower Switch (optional)44J06(-1 and -2 models) Not used with Twinning KitslAnnual Fuel DOEtest procedures andFTClabelingregulations.

5 Isolatedcombustionsystemratingfor non-weatherizedfurnaces.}Polyurethane frame type filter. Determine from venting tables proper intake and exhaust pipe size and termination kit 3 SPECIFICATIONSM odel Btuh (kW)100,000 ( )125,000 ( )Output Btuh (kW)91,000 ( )93,000 ( )115,000 ( )116,000 ( ) Seasonal Exhaust pipe connection (PVC) diameter in. (mm)2 (51) Intake pipe connection (PVC) diameter in. (mm)3 (76)Condensate drain connection (PVC) in. (mm)1/2 ( )Temperature rise range _F (_C)50-80 (28-44)40-70 (22-39)55-85 (31-47)50-80 (28-44)High static certified by ( ) in. wg. (Pa).50 (125) or x 1011-1/2 x 910 x 1011-1/2 x 9 Blowerwheelnominaldiameter x widthmm254 x 254292 x 229254 x 254292 x 229 Blower motor output hp (W)1/2 (373)3/4 (560)1/2 (373)3/4 (560)NominalcoolingTons2 to 43-1/2 to 52 to 43-1/2 to 5 Nominalcoolingthat can be to to to to weight lbs.

6 (kg) 1 package186 (84)198 (90)218 (99)218 (99)Electrical characteristics120 volts 60 hertz 1 phase (all models) (less than 12 amps)bOptional Accessories (Must Be Ordered Extra)bLPG/Propane kit (optional)65K27(all models)Filter and Filter Rack Kits}No. & size of filters - in. (mm)Single(44J21)Ten Pack(66K62)(1) 20 x 25 x 1 (508 x 635 x 25)Concentric Vent/Intake Air/Roof Termination Kit (optional)33K97 2 inch (51 mm) Vent/IntakeAirRoof2 inch (51 mm)15F75 Vent/IntakeAirRoofTermination Kit (optional) vent size3 inch (76 mm)44J41 Vent/Intake Air WallTerminationKit(optional) ventsize2 inch (51 mm)15F74(ring kit) 22G44(close couple) 30G28(WTK close couple)30G79(WTKX close couple with extension riser)TerminationKit(optional) ventsize3 inch (76 mm)44J40(close couple) 81J20(WTK close couple)TwinningKitsNon-continuous low speed64H88(all models)TwinningKits(optional)Continuous low speed35J93(all models)Continuous Low Speed Blower Switch (optional)44J06(-1 and -2 models) Not used with Twinning KitslAnnual Fuel DOEtest procedures andFTClabelingregulations.

7 Isolatedcombustionsystemratingfor non-weatherizedfurnaces.}Polyurethane frame type filter. Determine from venting tables proper intake and exhaust pipe size and termination kit - 2 inch x 3 inch (51 mm x 76 mm) adaptor is furnished with -100 and -125 furnaces for exhaust pipe PERFORMANCE DATAFILTER AIR RESISTANCEcfm(L/s)in. (Pa)0 (0) (0)200 (95) (0)400 (190) (5)600 (285) (10)800 (380) (15)1000 (470) (20)1200 (565) (30)1400 (660) (35)1600 (755) (45)1800 (850) (55)2000 (945) (65)2200 (1040) (80)2400 (1130) (95)2600 (1225) (110) 4 BLOWER PERFORMANCE DATAG26Q2 50 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMediumLowin. NOTE All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 50 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMedium HighMedium LowLowin.

8 All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 75 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMedium HighMedium LowLowin..902258053804456302952955402552 40 NOTE All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 75 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMedium HighMediumMedium LowLowin. All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 5 BLOWER PERFORMANCE DATAG26Q3/4 100 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMedium HighMedium LowLowin.

9 All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 100 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMedium HighMediumMedium LowLowin. All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 125 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMedium HighMedium LowLowin. All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 125 BLOWER PERFORMANCEE xternal StaticAir Volume and Motor Watts at Specific Blower TapsExternal StaticPressureHighMedium HighMediumMedium LowLowin.

10 All air data is measured external to unit with 1 in. (25 mm) cleanable foam filter (not furnished) in place. Also see Filter Air Resistance 6 INTAKE and EXHAUST PIPE VENTING TABLEVent PipeMaximumMinimum Vent Pipe Diameter RequiredMaximumEquivalent Length50,000 Btuh ( kW)75,000 Btuh ( kW)100,000 Btuh ( kW)125,000 Btuh ( kW) 1 MINIMUM PIPE LENGTHS FOR FURNACES G26 50 5 feet ( m) with two 90 elbows of 1 1/2 inch (38 mm) diameter pipe. (15 equivalent feet ( m) total).G26 75 5 feet ( m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet ( m) total).G26 100 5 feet ( m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet ( m) total).G26 125 5 feet ( m) with two 90 elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet ( m) total).VENTING NOTES One 90 elbow is equivalent to 5 feet ( m) of straight vent 45 elbows are equal to one 90 45 elbow is equivalent to feet (.)