Lennox Hearth Furnace G43UF User Manual

G A S F U R N A C E S  
G43UF  
MERIT® SERIES  
Up−Flow  
E N G I N E E R I N G D A T A  
Bulletin No. 210394  
August 2005  
Supersedes December 2004  
AFUE − up to 92.1%  
Input − 44,000 to 132,000 Btuh  
Nominal Add−on Cooling − 2 to 5 Tons  
MODEL NUMBER IDENTIFICATION  
G 43 UF − 24B − 045  
Unit Type  
G = Gas Furnace  
Nominal Gas Heat Input  
Series  
43 = 90% Minimum AFUE  
045 = 44,000 Btuh (12.9 kW)  
070 = 66,000 Btuh (19.3 kW)  
090 = 88,000 Btuh (25.8 kW)  
110 = 110,000 Btuh (32.2 kW)  
135 = 132,000 Btuh (38.7 kW)  
Configuration  
UF = Up−Flow  
1
Cabinet Width  
Nominal Add−On Cooling Capacity  
24 = 2 tons (7.0 kW)  
36 = 3 tons (10.5 kW)  
B = 17−1/2 in. (445 mm)  
C = 21 in. (533 mm)  
D = 24−1/2 in. (622 mm)  
48 = 4 tons (14.10 kW)  
60 = 5 tons (17.5 kW)  
1
Indoor coils with the same letter designation  
will physically match the furnace.  
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FEATURES  
OPTIONS  
B HEATING SYSTEM  
Lennox Duralok Plus Heat Exchanger Assembly  
®
High Altitude Orifice Kit − Natural Gas Only  
Required for all natural gas models for proper unit operation at  
altitudes of 7501 to 10,000 feet (2286 to 3048 m).  
Proper orifice for LPG/Propane models is included with  
LPG/Propane Conversion Kit.  
Lennox developed heat exchanger assembly consists of primary  
heat exchanger and secondary condenser coil assembly.  
Main 3-pass clamshell type heat exchanger constructed of  
heavy−gauge, aluminized steel.  
Designed for normal expansion and contraction.  
Crimped seam design and construction provides maximum  
efficiency and minimum resistance to airflow.  
High Altitude Pressure Switch Kit  
Required on certain units for proper unit operation on  
installations above 4,500 ft. (1372 m).  
Secondary heat exchanger condenser coil constructed of  
aluminum fins fitted to stainless steel tubes.  
Coil is factory tested for leaks.  
C
LPG/Propane Conversion Kit  
Required for field changeover from natural gas to LPG/Propane.  
Condensate drain header box assembly located on front of coil.  
Compact size of complete heat exchanger assembly permits low  
overall design of furnace cabinet.  
All components mounted in a heavy−gauge steel frame.  
Heat exchanger assembly has been laboratory life cycle tested.  
Lennox Designed Header Box  
Header box on end of condenser coil collects flue condensate for  
disposal through condensate collars.  
Hose connects the header box drains to the condensate collars.  
The condensate collars are located on each side of the cabinet  
for easy field installation of condensate drain trap. Only one  
collar is used, the other is plugged.  
Condensate drain trap is included with the unit for field installation.  
Lennox Designed Flue Condensate Trap Assembly  
Condensate trap assembly is mounted outside the conditioned  
air stream.  
Assembly can be mounted on either side of cabinet. See  
Installation Instructions.  
CONTROLS  
H Integrated Furnace Control Board  
Solid−state board contains all necessary controls and relays to  
operate furnace.  
Combustion air inducer is controlled by board. Prior to ignition, a  
pre−purge cycle for 15 seconds is initiated. After the main  
burners are turned off, a post−purge cycle for 5 seconds is run.  
Ignition control board continuously monitors line voltage and  
maintains the igniter power at a constant level to provide  
consistent lighting and maximum igniter life.  
Electronic flame sensor control assures safe and reliable operation.  
Should loss of flame occur, flame sensor controls will initiate 4  
attempts at re−ignition before locking out unit operation for 60  
minutes.  
Watchguard type circuit automatically resets ignition controls  
after one hour of continuous thermostat demand after unit  
lockout, eliminating nuisance calls for service.  
Fan control consists of adjustable blower timed−off delay (60, 90,  
120, 180 seconds − factory setting 90 seconds) and fixed blower  
timed−on delay (45 seconds).  
Connection can be made with field provided 1/2 in. PVC pipe, 3/4 in.  
PVC coupling, or 1−1/4 in. OD x 1 in. ID vinyl tubing with hose clamp.  
Easy to clean and winterize.  
For air−conditioning applications, blower is automatically  
energized on thermostat demand for cooling.  
Two accessory terminals furnished for additional power supply  
requirements for 120 volt (less than 1 amp) power humidifiers and  
powered air cleaners.  
D Inshot Burners  
Aluminized steel inshot burners provide efficient, trouble−free  
operation.  
I
Burner venturi mixes air and gas in correct proportion for proper  
combustion.  
Burner assembly is removable from the unit as a single  
component for ease of service.  
Hot Surface Mini−Nitride Ignitor  
Ignition control has two LED’s to indicate status and as an aid in  
troubleshooting.  
J 24 Volt Transformer  
Furnished and factory installed in control box.  
40VA transformer has fuse wired in series.  
Unique, non−porous, high strength proprietary ceramic material  
provides long life and trouble−free maintenance.  
Low mass element provides fast heat−up and consistent igniter  
temperature with low power usage.  
Cemented to alumina block for positive mounting and protection  
against current leakage.  
K Field Wiring Make-up Box  
Furnished for line voltage wiring.  
Factory installed internally on left side of furnace.  
Box may be installed internally or externally on either side of  
furnace.  
®
High temperature Teflon insulated ignition lead wires for  
dependable operation.  
OPTIONS  
E Gas Control Valve  
24 volt redundant combination gas control valve combines  
manual shut off valve (On−Off), automatic electric valve (dual)  
and gas pressure regulation into a compact combination control.  
Thermostat  
See Thermostat bulletins in Controls section and Lennox Price  
Book for a complete list of thermostats.  
F Combustion Air Inducer  
Twinning Kit  
Shaded pole heavy−duty blower prepurges heat exchanger and  
safely vents flue products.  
Required to operate two furnaces simultaneously.  
Kit consists of twinning control and two fan sensors.  
Pressure switch proves blower operation before allowing gas  
valve to open.  
G
BLOWER  
Operates only during heating cycle.  
Limit Control  
Automatic reset, primary limit is accurately located.  
Factory installed on vestibule panel on all units.  
Flame Rollout Switch  
Multi-speed, direct drive blower.  
Statically and dynamically balanced.  
Resiliently mounted.  
L
Blower assembly slides out of unit for servicing.  
Blower speeds are easily changed on the integrated furnace  
control board. See blower performance tables.  
M
Manual reset switches are factory installed on burner box.  
Switch provides protection from abnormal operating conditions.  
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FEATURES  
OPTIONS  
FILTER (NOT FURNISHED)  
Filter and provisions for external mounting must be field  
provided.  
Condensate Drain Heat Cable Kits  
Self-limiting wattage heat cable prevents condensate drain from  
freezing in unconditioned areas.  
OPTIONS  
Available in 6, 24 or 50 ft. (1.8, 7.3, or 15.2 m) lengths.  
Heat Cable Tape:  
66 ft. (20 m) length, 1/2 in. (13 mm) wide fiberglass.  
60 ft. (18 m) length, 2 in. (51 mm) wide aluminum foil.  
Air Filter and Rack Kit for Side Return Air Applications  
(Not for use with RAB Return Air Base)  
Washable or vacuum cleanable polyurethane frame type filter  
and external side return air rack available for field installation.  
Available in single and ten pack kits.  
Rack has filter door for easy filter servicing.  
Flanges on rack allow easy duct connection.  
Field installs on either side of unit cabinet.  
See dimension drawing.  
Condensate Trap Alternate Location Kit  
Allows condensate drain to be installed on the opposite side of  
the furnace from the exhaust venting (up−flow applications only).  
RAB Return Air Base  
On furnaces with side return air and condensate trap on the  
same side of the cabinet, a field fabricated transition or RAB is  
required when installing an IAQ product higher than 14−3/16 in.  
(360 mm) when installed next to the unit and serviced from the  
front. IAQ products higher than 20 in. (508 mm) require a field  
fabricated transition.  
Must be used for 60C and 60D models with air volumes over  
1800 cfm (850 L/s) in up−flow applications when only one side  
return is required.  
EZ Filter Base for Bottom Return Air Applications  
Hinged door with thumbscrew for easy filter access.  
Uses standard size filters (field provided).  
CABINET  
Low−profile, narrow width cabinet allows easy installation.  
Heavy−gauge, cold rolled steel construction.  
Pre−painted cabinet finish.  
Flanges provided on supply air opening for ease of plenum  
connection or alignment with indoor coil.  
Cabinet is insulated with foil faced insulation on sides and back  
of heating compartment.  
Complete service access.  
Cabinet is pre−painted steel to match the furnace.  
See Dimension Drawing.  
N
O
Safety interlock switch automatically shuts off power to unit  
when blower compartment access door is removed.  
Gas piping and electrical inlets are provided in both sides of cabinet.  
Return Air Entry:  
P
For bottom return−air entry, remove furnished bottom seal panel  
from cabinet.  
For side return−air entry, corners are marked on either side of  
cabinet for return air cut−outs. On furnaces with side return air  
and condensate trap on the same side of the cabinet, a field  
fabricated transition or RAB is required to use an IAQ product  
higher than 14−3/16 in. (360 mm) when installed next to the unit  
and serviced from the front. IAQ products higher than 20 in. (508  
mm) require a field fabricated transition. See dimension  
drawings.  
NOTE − 60C and 60D size units that require air volumes over  
1800 cfm (850 L/s) must have one of the following:  
1. Single side return air with transition, to accommodate 20 x  
25 x 1 in. (508 x 635 x 25 mm) cleanable air filter, required to  
maintain proper air velocity.  
2. Single side return air with optional RAB Return Air Base.  
3. Bottom return air.  
4. Return air from both sides.  
5. Bottom and one side return air.  
See Blower Performance Tables for additional information.  
Coil Match−up  
All furnaces exactly match C33 and CX34 cased up−flow indoor  
coils with same letter designation in model number. No adaptor  
required. Engaging holes furnished on cabinet for alignment.  
C33 uncased coils match furnaces without any overhang but  
require an optional adaptor base or field fabricated transition to  
match furnace opening. See C33 coil bulletin for additional  
information.  
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SPECIFICATIONS  
Gas  
Heating  
Performance  
ModelꢀNo.  
G43UF  
−24B−045  
G43UF  
−24B−070  
G43UF  
−36B−070  
G43UF  
−36C−090  
G43UF  
−36C−090H  
Canada Only  
Inputꢀ− Btuh (kW) 44,000 (12.9) 66,000 (19.3) 66,000 (19.3) 88,000 (25.8) 88,000 (25.8)  
Outputꢀ− Btuh (kW) 40,300 (11.8) 61,000 (17.9) 62,000 (18.2) 82,000 (24.0) 81,000 (23.7)  
Temperature rise range − _ F (_ C)  
30 − 60  
(18 − 36)  
50 − 80  
(28 − 44)  
40 − 70  
(22 − 39)  
40 − 70  
(22 − 39)  
50 − 80  
(28 − 44)  
1
AFUE  
92.1%  
.50 (124)  
2 / 2  
90.0%  
.50 (124)  
2 / 2  
92.1%  
.50 (124)  
2 / 2  
92.1%  
.50 (124)  
2 / 2  
90.0%  
.50 (124)  
2 / 2  
Highꢀstaticꢀ(CSA)ꢀ− in.ꢀw.g. (Pa)  
Intake / Exhaust Pipe (PVC)  
Connections  
in.  
Condensate Drain Trap (PVC pipe) − i.d.  
with field supplied (PVC coupling) − o.d.  
hose with hose clamp − i.d. x o.d.  
GasꢀpipeꢀsizeꢀIPSꢀ  
1/2  
1/2  
1/2  
1/2  
1/2  
3/4  
3/4  
3/4  
3/4  
3/4  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
Indoor  
Blower  
Wheel nominal diameter x width −ꢀin. 10 x 7  
(mm) (254 x 178)  
10 x 7  
(254 x 178)  
10 x 8  
(254 x 203)  
10 x 8  
(254 x 203)  
10 x 8  
(254 x 203)  
Motorꢀoutput − hp (W)  
Tonsꢀ(kW) ofꢀadd−onꢀcooling  
1/5 (149)  
1/5 (149)  
1/3 (249)  
1/3 (249)  
1/3 (249)  
1.5 − 2  
(5.3 − 7.0)  
1.5 − 2  
(5.3 − 7.0)  
2 − 3  
(8.8 − 10.5)  
2 − 3  
(7.0 − 10.5)  
2 − 3  
(7.0 − 10.5)  
Air Volume Range − cfm (L/s) 465 − 1125  
(220 − 530)  
425 − 1020  
(200 − 480)  
710 − 1640  
(335 − 775)  
730 − 1630  
(345 − 770)  
730 − 1630  
(345 − 770)  
ShippingꢀData − lbs. (kg) − 1 package  
132 (60)  
141 (64)  
146 (66)  
162 (74)  
162 (74)  
Electricalꢀcharacteristics  
120 volts − 60 hertz − 1 phase (less than 12 amps)  
SPECIFICATIONS  
Gas  
Heating  
Performance  
ModelꢀNo.  
G43UF  
−48C−090  
G43UF  
−48C−110  
G43UF  
−48C−110H  
Canada Only  
G43UF  
−60C−110  
G43UF  
−60D−135  
Inputꢀ− Btuh (kW) 88,000 (25.8) 110,000 (32.2) 110,000 (32.2) 110,000 (32.2) 132,000 (38.7)  
Outputꢀ− Btuh (kW) 82,000 (24.0) 103,000 (30.2) 101,000 (29.6) 103,000 (30.2) 123,000 (36.0)  
Temperature rise range − _ F (_ C)  
40 − 70  
(22 − 39)  
45 − 75  
(27 − 45)  
50 − 80  
(28 − 44)  
40 − 70  
(22 − 39)  
45 − 75  
(27 − 45)  
1
AFUE  
92.1%  
.50 (124)  
2 / 2  
92.1%  
.50 (124)  
2 / 2  
90.0%  
.50 (124)  
2 / 2  
92.1%  
.50 (124)  
2 / 2  
92.1%  
.50 (124)  
3 / 3  
Highꢀstaticꢀ(CSA)ꢀ− in.ꢀw.g. (Pa)  
Intake / Exhaust Pipe (PVC)  
Connections  
in.  
Condensate Drain Trap (PVC pipe) − i.d.  
with field supplied (PVC coupling) − o.d.  
hose with hose clamp − i.d. x o.d.  
GasꢀpipeꢀsizeꢀIPS  
1/2  
1/2  
1/2  
1/2  
1/2  
3/4  
3/4  
3/4  
3/4  
3/4  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
1−1/4 x 1  
1/2  
Indoor  
Blower  
Wheelꢀnominalꢀdiameter ꢀxꢀwidth −ꢀin. 10 x 10  
(mm) (254 x 254)  
10 x 10  
(254 x 254)  
10 x 10  
(254 x 254)  
11−1/2 x 10  
(292 x 229)  
11−1/2 x 10  
(292 x 229)  
Motorꢀoutput − hp (W)  
Tonsꢀ(kW) ofꢀadd−onꢀcooling  
1/2 (373)  
3 − 4  
1/2 (373)  
3 − 4  
1/2 (373)  
3 − 4  
1 (746)  
4 − 5  
1 (746)  
4 − 5  
(10.5 − 14.0) (10.5 − 14.0) (10.5 − 14.0) (14.0 − 17.5) (14.0 − 17.5)  
Air Volume Range − cfm (L/s) 950 − 2180 885 − 2160 885 − 2160 1470 − 2720 1440 − 2730  
(450 − 1030) (420 − 1020) (420 − 1020) (695 − 1285) (680 − 1290)  
168 (76) 178 (81) 178 (81) 186 (84) 203 (92)  
120 volts − 60 hertz − 1 phase (less than 12 amps)  
ShippingꢀData − lbs. (kg) − 1 package  
Electricalꢀcharacteristics  
NOTE − Filters and provisions for mounting are not furnished and must be field provided.  
1
Annual Fuel Utilization Efficiency based on DOE test procedures and according to FTC labeling regulations. Isolated combustion system rating for non−weatherized furnaces  
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OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA  
ꢁB" Width Models  
ꢁC" Width Models  
ꢁD" Width Models  
FILTER KITS  
1
Air Filter and  
Rack Kit  
Horizontal (end)  
Side Return  
Size of filter in. 87L96 − 18 x 25 x 1  
(mm)  
87L97 − 20 x 25 x 1  
(508 x 635 x 25)  
87L98 − 25 x 25 x 1  
(635 x 635 x 25)  
(457 x 635 x 25)  
Single  
44J22  
44J22  
66K63  
44J22  
66K63  
Ten Pack  
66K63  
Size of filter in. (mm)  
16 x 25 x 1  
(406 x 635 x 25)  
16 x 25 x 1  
(406 x 635 x 25)  
16 x 25 x 1  
(406 x 635 x 25)  
EZ Filter Base  
Catalog No. − Ship. Wt. − lbs. (kg)  
73P56 − 7 (3)  
73P57 − 8 (4)  
73P58 − 10 (5)  
Size of field provided filter − in.  
(mm)  
16 x 25 x 1  
(406 x 635 x 25)  
20 x 25 x 1  
(508 x 635 x 25)  
24 x 24 x 1  
(610 x 610 x 25)  
CABINET ACCESSORIES  
Down−Flow Additive Base  
Horizontal Support Frame Kit  
Return Air Base  
11M60  
56J18  
76M88  
11M61  
56J18  
74M74  
11M62  
56J18  
74M75  
CONDENSATE DRAIN KITS  
Condensate Drain Heat Cable  
6 ft. (1.8 m)  
24 ft. (7.3 m)  
50 ft. (15.2 m)  
26K68  
26K69  
26K70  
39G04  
39G03  
76M20  
26K68  
26K69  
26K70  
39G04  
39G03  
76M20  
26K68  
26K69  
26K70  
39G04  
39G03  
76M20  
Heat Cable Tape  
Fiberglass − 1/2 in. x 66 ft.  
Aluminum foil − 2 in. x 60 ft.  
Condensate Trap Alternate Location Kit − Up−Flow Only  
CONTROLS  
Twinning Kit  
15L38  
15L38  
15L38  
TERMINATION KITS − See Installation Instructions for specific venting information.  
4
Termination  
Concentric  
1−1/2 in. (38 mm)  
2 in. (51 mm)  
3 in. (76 mm)  
2 in. (51 mm)  
3 in. (76 mm)  
71M80  
− − −  
− − −  
69M29  
60L46  
− − −  
− − −  
− − −  
Kits  
Direct Vent  
Applications  
Only  
− − −  
60L46  
− − −  
Wall − Close  
Couple  
22G44  
44J40  
30G28  
81J20  
15F75  
15F74  
44J40  
− − −  
44J40  
− − −  
Close Couple WTK − 2 in. (51 mm)  
3 in. (76 mm)  
81J20  
15F75  
15F74  
81J20  
− − −  
2, 4  
Termination  
Kits − Direct or  
Non−Direct Vent  
Roof  
Wall − Wall Ring  
Kit  
2 in. (51 mm)  
2 in (51 mm)  
3
15F74  
4
Roof Termination Flashing Kit − Direct or Non−Direct  
Vent − Contains two flashings.  
44J41  
44J41  
44J41  
1
2
3
Cleanable polyurethane frame type filter.  
Kits contain enough parts for two, non−direct vent installations.  
Non−direct vent only.  
GAS HEAT ACCESSORIES  
1
High Altitude  
Orifice Kit  
Natural Gas Only  
High Altitude Pressure  
Switch Kit  
LPG/Propane Kit  
Input  
4501−7500 ft.  
(1372−2286 m)  
7501−10,000 ft.  
(2286−3048 m)  
0−7500 ft.  
(0−2286 m)  
7501−10,000 ft.  
(2286−3048 m)  
−045  
−070  
−090  
−110  
−135  
59M16  
59M16  
59M16  
59M16  
59M16  
− − −  
95M22  
56M06  
56M07  
56M07  
60M35  
83M74  
83M74  
83M74  
83M74  
83M74  
83M75  
83M75  
83M75  
83M75  
83M75  
56M05  
75M20  
75M20  
56M04  
1
Required for proper operation at altitudes from 7501 to 10,000 ft. (2286 to 3048 m).  
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EXHAUST PIPE VENTING TABLE  
1
Maximum Equivalent Vent Length − One or Two Pipe Applications  
2
Vent Size  
(diameter)  
G43UF−24B−070  
G43UF−36B−070  
G43UF−36C−090  
G43UF−48C−090  
G43UF−48C−110  
G43UF−60C−110  
3
Altitude  
G43UF−24B−045  
G43UF−60D−135  
2
ft.  
m
ft.  
m
ft.  
m
15  
31  
38  
69  
15  
31  
38  
69  
9
ft.  
30  
m
9
ft.  
m
0 − 2000 ft.  
(0 − 609 m)  
2 in.  
2−1/2 in.  
3 in.  
110  
135  
160  
250  
110  
135  
160  
250  
110  
135  
160  
250  
110  
135  
160  
250  
34  
41  
49  
76  
34  
41  
49  
76  
34  
41  
49  
76  
34  
41  
49  
76  
70  
21  
41  
49  
76  
21  
41  
49  
76  
21  
41  
49  
76  
21  
41  
49  
76  
50  
n/a  
n/a  
125  
n/a  
n/a  
135  
160  
250  
70  
100  
125  
225  
50  
70  
21  
38  
61  
6
4
4
125  
200  
20  
38  
55  
4 in.  
180  
n/a  
n/a  
2001 − 4500 ft.  
(610 − 1371 m)  
2 in.  
n/a  
n/a  
2−1/2 in.  
3 in.  
135  
160  
250  
70  
100  
125  
225  
30  
70  
21  
38  
61  
n/a  
21  
38  
61  
n/a  
21  
38  
61  
4
4
125  
200  
n/a  
70  
90  
27  
55  
4 in.  
180  
n/a  
n/a  
4501 − 7500 ft.  
(1372 − 2286 m)  
2 in.  
n/a  
n/a  
2−1/2 in.  
3 in.  
135  
160  
250  
70  
100  
125  
225  
n/a  
31  
38  
69  
n/a  
31  
38  
69  
4
4
125  
200  
n/a  
70  
90  
27  
55  
4 in.  
180  
n/a  
n/a  
7501 − 10,000 ft.  
(2287 − 3048 m)  
2 in.  
n/a  
n/a  
2−1/2 in.  
3 in.  
135  
160  
250  
100  
125  
225  
4
4
125  
200  
90  
27  
55  
4 in.  
180  
NOTE − Minimum Equivalent Vent Pipe length is 15 feet (4.6 m).  
1
ꢁMaximum Equivalent Vent Length" permitted is defined as ꢁTotal Length (linear feet) of vent pipe, plus equivalent length (ft.) of fittings, plus equivalent length (ft.) of termination".  
110 models must have the supplied 90° street ell installed directly into the unit flue collar. The street ell must be included in the elbow count.  
135 models must have 3 in. to 2 in. reducing elbow (supplied) installed directly into the flue collar. Reducing ell must be included in elbow count.  
2
3
4
90_  
elbows must be limited to 3 in. sweep type elbows.  
VENTING NOTES ꢂ One 90_elbow is equivalent to 5 feet (1.5 m) of straight vent pipe.  
Two 45_ elbows are equal to one 90_ elbow.  
One 45_ elbow is equivalent to 2.5 feet (.75 m) of straight vent pipe.  
Wall and roof termination (non−concentric) exhaust pipe must terminate with reducer to improve exhaust velocity away from intake piping.  
045 and 070 − 2, 2−1/2, 3 or 4 in. − terminate with 1−1/2 in. pipe  
090 − 2, 2−1/2, 3 or 4 in. − terminate with 2 in. pipe  
110 − 2, 2−1/2, 3 or 4 in. − terminate with 2 in. pipe  
135 − 3 or 4 in. − terminate with 2 in. pipe  
TERMINATION KITS − EQUIVALENT VENT LENGTHS  
Vent Pipe Equivalent Length − ft. (m)  
Outdoor Exhaust  
Accelerator  
(Diameter X Length)  
Concentric  
Kits  
Close Couple  
Kits  
Wall Ring  
Kit  
Vent Pipe  
Diameter  
Heat  
Size  
1−1/2 in.  
(38 mm)  
2 in.  
(51 mm)  
3 in.  
(76 mm)  
2 in.  
(51 mm)  
3 in.  
(76 mm)  
2 in. 1−1/2 x 12 in. 2 x 12 in.  
(51 mm) (38 x 305 mm) (51 x 305 mm)  
22G44 44J40  
30G28 (WTK) 81J20 (WTK)  
in.  
mm  
71M80  
69M29  
60L46  
15F74  
− − −  
− − −  
1
2
51  
12 (3.6) not allowed not allowed  
15 (4.6) not allowed not allowed  
21 (6.4) not allowed not allowed  
4 (1.2)  
5 (1.5)  
4 (1.2)  
5 (1.5)  
7 (2.1)  
14 (4.3)  
4 (1.2)  
5 (1.5)  
8 (2.4)  
14 (4.3)  
4 (1.2)  
5 (1.5)  
7 (2.1)  
14 (4.3)  
4 (1.2)  
5 (1.5)  
8 (2.4)  
14 (4.3)  
4 (1.2)  
5 (1.5)  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
1 (0.3)  
1
1
2−1/2 64  
−045  
−070  
−090  
3
4
2
76  
7 (2.1)  
7 (2.1)  
1
102 42 (12.8) not allowed not allowed  
14 (4.3)  
14 (4.3)  
1
1
1
51  
12 (3.6) not allowed not allowed  
15 (4.6) not allowed not allowed  
24 (7.3) not allowed not allowed  
4 (1.2)  
4 (1.2)  
2−1/2 64  
5 (1.5)  
5 (1.5)  
3
4
2
76  
8 (2.4)  
8 (2.4)  
1
102 42 (12.8) not allowed not allowed  
14 (4.3)  
14 (4.3)  
2
51 not allowed  
3 (1)  
3 (1)  
6 (1.8)  
6 (1.8)  
12 (3.7)  
3 (1)  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
1 (0.3)  
2 (0.6)  
2 (0.6)  
4 (1.2)  
1 (0.3)  
2 (0.6)  
2 (0.6)  
4 (1.2)  
6 (1.8)  
1 (0.3)  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
not allowed  
2
2−1/2 64 not allowed  
6 (1.8)  
6 (1.8)  
2 (0.6)  
2 (0.6)  
2
3
4
2
76 not allowed  
2 (0.6)  
2 (0.6)  
2
102 not allowed 12 (3.7)  
4 (1.2)  
4 (1.2)  
2
51 not allowed  
3 (1)  
1 (0.3)  
1 (0.3)  
3
2−1/2 64 not allowed  
6 (1.8)  
6 (1.8)  
6 (1.8)  
6 (1.8)  
12 (3.7)  
2 (0.6)  
2 (0.6)  
−110  
−135  
3
3
4
3
4
76 not allowed  
2 (0.6)  
2 (0.6)  
3
102 not allowed 12 (3.7)  
4 (1.2)  
4 (1.2)  
3
76 not allowed not allowed 15 (4.6)  
102 not allowed not allowed 25 (7.6)  
6 (1.8)  
6 (1.8)  
3
10 (3.0)  
10 (3.0) not allowed  
10 (3.0)  
1
2
3
Requires field provided 1−1/2 in. (38 mm) outdoor exhaust accelerator.  
Requires field provided 2 in. (51 mm) outdoor exhaust accelerator.  
For use only in non−direct vent applications, when snow riser is not required. Requires field provided 2 in. (51 mm) outdoor exhaust accelerator.  
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FILTER AIR RESISTANCE  
HIGH ALTITUDE INFORMATION  
For 1 Inch (25 mm) Cleanable Filter (Field Provided)  
Pressure regulator adjustment may be required depending on  
altitude. See below for proper pressure regulator setting.  
cfm  
0
L/s  
0
in. w.g.  
0.00  
0.01  
0.03  
0.04  
0.06  
0.09  
0.12  
0.15  
0.19  
0.23  
0.27  
0.33  
0.38  
0.44  
Pa  
0
Manifold Pressure  
(Outlet)  
in. w.g. (kPa)  
200  
95  
0
Fuel  
Altitude − ft. (m)  
400  
190  
285  
380  
470  
565  
660  
755  
850  
945  
1040  
1130  
1225  
5
Natural  
0−4500 (0−1372)  
3.5 (0.87)  
600  
10  
15  
20  
30  
35  
45  
55  
65  
80  
95  
110  
2
4501−7500 (1373−2286)  
7501−10000 (2287−3048)  
0−4500 (0−1372)  
3.5 (0.87)  
800  
1,2  
3.5 (0.87)  
1000  
1200  
1400  
1600  
1800  
2000  
2200  
2400  
2600  
3
LPG  
Propane  
10.0 (2.49)  
2
4501−7500 (1373−2286)  
7501−10,000 (0−3048)  
10.0 (2.49)  
2
10.0 (2.49)  
1
2
High Altitude Orifice Kit required, see Gas Heat Accessories table for order number.  
High Altitude Pressure Switch Kits as required, see Gas Heat Accessories table for  
order number.  
3
LPG/Propane conversion kit required, see Gas Heat Accessories table for order  
number.  
INSTALLATION CLEARANCES  
1
INSTALLATION CONFIGURATIONS  
AIR FLOW  
Sides  
Rear  
0 inches (0 mm)  
VENT  
PIPING  
0 inches (0 mm)  
Top/Plenum  
Front  
1 inch (25 mm)  
0 inches (0 mm)  
NOTE − The vent  
piping and conden-  
sate drain can be  
moved to the other  
side of the unit. Vent  
piping and drain  
must be installed on  
the same side of the  
unit with each other  
unless optional Con-  
densate Trap Alter-  
Front (service/alcove)  
Floor  
24 inches (610 mm)  
HEAT  
EXCHANGER  
2
Combustible  
NOTE − Air for combustion and supply air ventilation must conform to the methods  
outlined in American National Standard (ANSI-Z223.1) National Fuel Gas Code or  
National Standard of Canada CAN/CGA-149.1, & CAN/CGA-149.2 ꢁInstallation Code  
for Gas Burning Appliances".  
NOTE−In the U.S. flue sizing must conform to the methods outlined in current  
GAMA/A.G.A. venting tables, American National Standard (ANSI-Z223.1) National  
Fuel Gas Code or applicable provisions of local building codes. In Canada flue sizing  
must conform to the methods outlined in National Standard of Canada  
CAN/CGA-149.1 and .2.  
CONDENSATE  
DRAIN  
nate Location Kit is  
used.  
1
BLOWER  
Allow proper clearances to accommodate condensate trap and vent pipe installation.  
Do not install the furnace directly on carpeting, tile, or other combustible materials other  
than wood flooring.  
2
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DIMENSIONS − INCHES (MM)  
1
NOTE − 60C and 60D size units that require air volumes over  
1800 cfm (850 L/s) must have one of the following:  
a. Single side return air with transition, to accommodate  
20 x 25 x 1 in. (508 x 635 x 25 mm) air filter. Required to  
maintain proper air velocity.  
SUPPLY AIR  
OPENING  
b. Single side return air with optional RAB Return Air Base  
c. Bottom return air.  
d. Return air from both sides.  
e. Bottom and one side return air.  
See Blower Performance Tables for additional information.  
2
Optional External Side Return Air Filter Kit is not for use with the  
optional RAB Return Air Base.  
23-3/4 (603)  
2
OPTIONAL  
EXTERNAL  
25 (635)  
TOP VIEW  
SIDE RETURN  
AIR FILTER KIT  
(Either Side)  
28−1/2  
(724)  
A
B
9/16  
(14)  
19−7/16  
(494)  
9/16 (14)  
COMBUSTION AIR INTAKE  
(Either Side)  
6−1/2  
(165)  
3−1/8  
(79)  
11−5/8 (295)  
Right  
EXHAUST AIR OUTLET  
(Either Side)  
4−1/8  
(103)  
6−3/4  
(171)  
9−3/4 (248)  
Left  
2
OPTIONAL  
GAS PIPING INLET  
(Either Side)  
EXTERNAL  
SIDE RETURN  
AIR FILTER KIT  
(Either Side)  
CONDENSATE  
TRAP CONNECTION  
(Either Side)  
4−7/8 (124) Right  
2−1/4 (57) Left  
40  
(1016)  
ELECTRICAL INLET  
(Either Side)  
2−1/2  
(64)  
23  
(584)  
4
(102)  
14−3/4  
(375)  
16  
18-3/4 (476)  
1
14  
(356)  
OPTIONAL  
RETURN CUTOUT  
(Either Side)  
(406)  
AIR FLOW  
1−15/16 (49)  
5/8 (16)  
3/4 (19)  
23−1/2  
(597)  
C
4−1/4  
(108)  
1
1
3/4 (19)  
Bottom Return  
Air Opening  
Bottom Return  
Air Opening  
FRONT VIEW  
SIDE VIEW  
A
B
C
Model No.  
in.  
mm  
in.  
mm  
in.  
mm  
G43UF−24B−045  
G43UF−24B−070  
G43UF−36B−070  
17−1/2  
446  
16−3/8  
416  
16  
406  
G43UF−36C−090  
G43UF−48C−090  
G43UF−48C−110  
G43UF−60C−110  
21  
533  
622  
19−7/8  
23−3/8  
454  
546  
19−1/2  
23  
495  
584  
G43UF−60D−135  
24−1/2  
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OPTIONAL ACCESSORY DIMENSIONS − INCHES (MM)  
RAB RETURN AIR BASE (Up−Flow Applications Only)  
For use with B, C, and D size furnaces only  
4
(102)  
CONDENSATE  
TRAP  
1
23 (584)  
Overall  
(Maximum)  
4
(102)  
1
Minimum  
11 (279)  
Maximum  
14 (356)  
14  
(356)  
14  
(356)  
1
2
18−1/2  
(470)  
Overall  
1
Unit side return  
air Opening  
AIR FLOW  
FURNACE  
FRONT  
(Maximum)  
SIDE RETURN  
AIR OPENINGS  
(Either Side)  
5
(102)  
6 (152)  
3/4  
(19)  
20−1/2 (521)  
OPTIONAL RAB  
RETURN AIR BASE  
17−1/2 (446) RAB−B−6 (76M88)  
21 (533) RAB−C−6 (74M74)  
24−1/2 (622) RAB−D−6 (74M75)  
7/8  
(22)  
27−5/8 (702)  
SIDE VIEW  
FRONT VIEW  
1
2
Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.  
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).  
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.  
Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air  
opening. The size of the opening must not extend beyond the markings on the furnace cabinet.  
14 inches (356 mm) is the maximum size the height of the unit opening can be cut. This may interfere with the condensate drain  
(if located on the same side of the unit as the opening).  
To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.  
NOTE− Optional Side Return Air Filter Kits are not for use with RAB Return Air Base.  
DIMENSIONS − INCHES (MM) − FURNACE/COIL COMBINED DIMENSIONS  
Cased  
Uncased (CX34 − cased only)  
A
B
A
B
Model No  
UP−FLOW POSITION  
in. mm in.  
mm  
in.  
mm  
in.  
mm  
CX34−18/24B−6F C33−24B  
CX34−18/24C−6F C33−24C  
16−1/2 419 56−1/2 1435 13−7/8 352 53−7/8 1368  
19−1/2 495 59−1/2 1511 15−7/8 403 55−7/8 1419  
20−1/2 521 60−1/2 1537 17−3/4 451 59−3/4 1467  
CX34−25B−6F  
C33−25B  
CX34−30B−6F  
CX34−30C−6F  
C33−30B  
C33−30C  
A
CX34−31B−6F  
CX34−36B−6F  
CX34−36C−6F  
CX34−38B−6F  
CX34−42B−6F  
CX34−43B−6F  
CX34−43C−6F  
C33−31B  
C33−36B  
C33−36C  
C33−38B  
C33−42B  
C33−43B  
C33−43C  
C33−44C  
23−1/2 597 63−1/2 1613 20−1/4 514 60−1/4 1530  
24−1/2 622 64−1/2 1638 21−7/8 556 61−7/8 1572  
24−1/2 622 64−1/2 1638 21−1/4 540 61−1/4 1556  
B
24−1/2 622 64−1/2 1638 22  
559  
62  
1575  
24−1/2 622 64−1/2 1638 21−7/8 556 61−7/8 1572  
28−1/2 724 68−1/2 1740 26−1/4 667 66−1/4 1683  
28−1/2 724 68−1/2 1740 25−3/4 654 65−3/4 1670  
24−1/2 622 64−1/2 1638 21−1/2 546 61−1/2 1562  
24−1/2 622 64−1/2 1638 22−1/8 562 62−1/8 1578  
24−1/2 622 64−1/2 1638 21−1/2 546 61−1/2 1562  
30−1/2 775 70−1/2 1791 28−1/2 724 68−1/2 1740  
40  
(1016)  
CX34−44/48B−6F C33−48B  
CX34−44/48C−6F C33−48C  
CX34−49C−6F  
C33−49C  
CX34−50/60C−6F C33−50/60C 27−1/2 699 67−1/2 1715 24−3/4 629 64−3/4 1645  
CX34−60D−6F  
CX34−62C−6F  
CX34−62D−6F  
C33−60D  
C33−62C  
C33−62D  
25−1/2 648 65−1/2 1664 24−3/4 629 64−3/4 1645  
32−1/2 826 72−1/2 1842 30−5/8 778 70−5/8 1793  
29−1/2 749 69−1/2 1765 28−3/4 730 68−3/4 1746  
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OPTIONAL ACCESSORY DIMENSIONS − INCHES (MM)  
CONCENTRIC WALL  
TERMINATION APPLICATIONS  
CONCENTRIC ROOF  
TERMINATION APPLICATIONS  
FLASHING  
(Not Furnished)  
10-1/2  
(267)  
12 (305)  
Minimum  
Above Average  
Snow  
Accumulation  
OUTSIDE  
WALL  
INTAKE  
AIR  
EXHAUST  
AIR  
EXHAUST  
AIR  
SHEET METAL STRAP  
(Clamp and sheet metal strap  
must be field installed to support  
the weight of the termination kit.)  
12 (305)  
Minimum  
Above  
INTAKE  
AIR  
INTAKE  
AIR  
CLAMP  
(Not Furnished)  
Grade  
CLAMP  
GRADE  
71M80 ꢂ 1−1/2 inch (38 mm)  
69M29 ꢂ 2 inch (51 mm)  
See Installation Instructions for specific usage.  
60L46 ꢂ 3 inch (76 mm)  
See Installation Instructions for specific usage.  
2 x 1-1/2 in. (51 x 38 mm) 60G77  
3 x 2 in. (76 x 51 mm) 33K97  
REDUCER BUSHING (Furnished)  
46−3/4  
(1187)  
37  
(940)  
6−1/2  
(165)  
INTAKE AIR  
4−1/2 (114)  
3 (76)  
INTAKE AIR  
EXHAUST  
AIR  
TERMINATION  
ASSEMBLY  
(Furnished)  
INTAKE AIR  
EXHAUST  
AIR  
CLAMP  
(Furnished)  
ELBOW  
(Furnished)  
TERMINATION  
ASSEMBLY  
(Furnished)  
ELBOW  
(Field Supplied)  
WALL ASSEMBLY TERMINATION KIT − RING KIT  
15F74 − 2 inch (51 mm)  
See Installation Instructions for specific usage.  
NON−DIRECT VENT APPLICATION  
NOTE ꢂ EXHAUST PIPE SHOWN  
Kit Contains Enough Parts For Two Installations  
DIRECT VENT APPLICATION  
NOTE − 12 in. (305 mm) minimum height above  
average snow accumulation.  
NOTE ꢂ 12 in. (305 mm) minimum height above  
average snow accumulation.  
12 in. (305 mm) maximum  
without support  
12 in. (305 mm) maximum  
without support  
6 in. (152 mm)  
maximum  
8 in. (203 mm)  
minimum  
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OPTIONAL ACCESSORY DIMENSIONS − INCHES (MM)  
DIRECT VENT APPLICATIONS  
WALL TERMINATION KITS (CLOSE-COUPLE) − 22G44 − 2 inch (51 mm) or 44J40 − 3 inch (76 mm)  
See Installation Instructions for specific usage.  
If Intake and Exhaust Pipe is less than  
12 in. (305 mm) above snow accumula-  
tion or other obstructions, field fabri-  
cated piping must be installed.  
EXHAUST  
AIR  
12  
(305)  
INSULATION  
(Not Furnished)  
INTAKE  
AIR  
INTAKE  
AIR  
EXHAUST  
AIR  
5 (127)  
2
12 (305)  
Minimum  
ABOVE GRADE  
(51)  
5-1/2  
(140)  
12  
12  
(305)  
(305)  
GRADE  
GRADE  
WTK WALL ASSEMBLY TERMINATION KIT WITH FIELD FABRICATED ABOVE GRADE EXTENDED CLEARANCE  
30G28 − 2 inch (51 mm) or 81J20 − 3 inch (76 mm)  
See Installation Instructions for specific usage.  
If Intake and Exhaust Pipe is less than  
12 in. (305 mm) above snow accumula-  
tion or other obstructions, field fabri-  
cated piping must be installed.  
EXHAUST  
AIR  
12  
(305)  
INSULATION  
(Not Furnished)  
INTAKE  
AIR  
EXHAUST  
AIR  
INTAKE  
AIR  
5
(127)  
8 (203)  
Minimum  
12 (305)  
Maximum  
12 (305)  
Minimum  
ABOVE GRADE  
5-1/2  
(140)  
GRADE  
GRADE  
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BLOWER/WATTS DATA  
G43UF−24B−045 PERFORMANCE (Less Filter)  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
Pa  
0
cfm  
1125  
1115  
1090  
1060  
1020  
970  
L/s  
530  
525  
515  
500  
480  
460  
435  
405  
360  
320  
Watts  
425  
410  
395  
380  
365  
345  
335  
315  
295  
275  
cfm  
900  
905  
895  
880  
860  
835  
795  
730  
665  
585  
L/s  
425  
425  
420  
415  
405  
395  
375  
345  
315  
275  
Watts  
cfm  
745  
760  
755  
740  
720  
700  
665  
620  
560  
495  
L/s  
350  
360  
355  
350  
340  
330  
315  
295  
265  
235  
Watts  
cfm  
690  
695  
685  
675  
665  
640  
600  
565  
510  
465  
L/s  
325  
330  
325  
320  
315  
300  
285  
265  
240  
190  
Watts  
265  
260  
255  
250  
240  
230  
220  
215  
200  
175  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
360  
350  
335  
325  
315  
300  
290  
270  
250  
230  
295  
285  
280  
270  
260  
255  
240  
230  
215  
200  
25  
50  
75  
100  
125  
150  
175  
200  
225  
920  
860  
760  
675  
G43UF−24B−070 PERFORMANCE (Less Filter)  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
Pa  
0
cfm  
1115  
1115  
1100  
1080  
1050  
1010  
980  
L/s  
525  
525  
520  
510  
495  
475  
460  
440  
405  
365  
Watts  
435  
425  
415  
400  
385  
365  
355  
340  
320  
295  
cfm  
875  
865  
870  
870  
855  
835  
810  
770  
720  
650  
L/s  
415  
410  
410  
410  
405  
395  
380  
365  
340  
305  
Watts  
cfm  
720  
725  
730  
725  
715  
695  
675  
640  
585  
525  
L/s  
340  
340  
345  
340  
335  
330  
320  
300  
275  
245  
Watts  
cfm  
665  
670  
665  
655  
645  
625  
600  
565  
520  
465  
L/s  
315  
315  
315  
310  
305  
295  
285  
265  
245  
220  
Watts  
255  
255  
250  
240  
240  
230  
225  
215  
200  
190  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
360  
350  
335  
330  
320  
310  
295  
285  
270  
250  
290  
285  
280  
270  
265  
255  
250  
235  
220  
205  
25  
50  
75  
100  
125  
150  
175  
200  
225  
930  
855  
770  
G43UF−36B−070 PERFORMANCE (Less Filter)  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
Pa  
0
cfm  
1640  
1600  
1540  
1495  
1420  
1360  
1275  
1170  
1080  
945  
L/s  
775  
755  
725  
705  
670  
640  
600  
555  
510  
445  
Watts  
660  
635  
605  
580  
545  
525  
490  
465  
440  
400  
cfm  
1415  
1395  
1370  
1345  
1275  
1245  
1165  
1085  
1010  
840  
L/s  
665  
660  
650  
635  
605  
590  
550  
515  
475  
395  
Watts  
cfm  
1160  
1160  
1160  
1145  
1125  
1080  
1025  
965  
L/s  
545  
545  
545  
540  
530  
510  
485  
430  
410  
360  
Watts  
cfm  
1005  
1000  
995  
990  
965  
945  
900  
860  
775  
710  
L/s  
475  
470  
470  
465  
455  
445  
425  
405  
365  
335  
Watts  
410  
385  
375  
365  
345  
325  
305  
295  
270  
245  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
575  
550  
525  
505  
480  
450  
410  
385  
360  
320  
485  
460  
445  
425  
395  
375  
350  
335  
310  
275  
25  
50  
75  
100  
125  
150  
175  
200  
225  
865  
765  
G43UF−36C−090(H) PERFORMANCE (Less Filter)  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
Pa  
0
cfm  
1630  
1620  
1590  
1550  
1520  
1465  
1415  
1350  
1260  
1165  
L/s  
770  
765  
750  
730  
715  
690  
670  
635  
595  
550  
Watts  
745  
715  
680  
655  
630  
605  
570  
545  
510  
475  
cfm  
1360  
1365  
1365  
1355  
1330  
1300  
1250  
1215  
1140  
1035  
L/s  
640  
645  
645  
640  
630  
615  
590  
575  
540  
485  
Watts  
cfm  
1125  
1160  
1160  
1170  
1160  
1140  
1095  
1065  
1005  
900  
L/s  
530  
545  
545  
550  
545  
540  
515  
500  
475  
425  
Watts  
cfm  
975  
1000  
990  
985  
980  
960  
940  
905  
850  
730  
L/s  
460  
470  
465  
465  
460  
455  
445  
425  
400  
345  
Watts  
440  
430  
405  
395  
380  
360  
350  
335  
310  
285  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
635  
610  
580  
565  
545  
515  
490  
470  
440  
395  
540  
515  
495  
475  
460  
440  
420  
400  
375  
335  
25  
50  
75  
100  
125  
150  
175  
200  
225  
NOTES − All air data is measured external to unit without filter (not furnished − field provided).  
Air volume based on bottom air return air. Actual air volume may vary on side return air applications.  
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BLOWER/WATTS DATA  
G43UF−48C−090 PERFORMANCE (Less Filter)  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
Pa  
0
cfm  
L/s  
1030  
1005  
985  
955  
915  
880  
820  
775  
725  
630  
Watts  
930  
885  
840  
800  
760  
725  
670  
640  
600  
540  
cfm  
1835  
1825  
1810  
1775  
1735  
1660  
1590  
1475  
1340  
1170  
L/s  
865  
860  
855  
835  
820  
785  
750  
695  
630  
555  
Watts  
cfm  
1520  
1510  
1505  
1500  
1480  
1430  
1380  
1290  
1175  
1070  
L/s  
715  
710  
710  
705  
700  
675  
650  
610  
555  
505  
Watts  
cfm  
1280  
1275  
1270  
1265  
1250  
1215  
1175  
1105  
1020  
950  
L/s  
605  
600  
600  
595  
590  
575  
555  
520  
480  
450  
Watts  
510  
495  
475  
460  
440  
425  
410  
375  
355  
330  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
2180  
2135  
2085  
2030  
1940  
1865  
1740  
1645  
1540  
1335  
790  
750  
720  
685  
650  
600  
575  
520  
465  
440  
630  
610  
580  
565  
535  
505  
475  
450  
405  
375  
25  
50  
75  
100  
125  
150  
175  
200  
225  
G43UF−48C−110(H) PERFORMANCE (Less Filter)  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
External Static  
Pressure  
High  
Low  
in. w.g.  
Pa  
0
cfm  
L/s  
1020  
990  
960  
925  
890  
840  
800  
745  
650  
580  
Watts  
880  
850  
805  
750  
725  
680  
660  
620  
550  
520  
cfm  
1880  
1855  
1815  
1755  
1715  
1630  
1550  
1410  
1230  
1120  
L/s  
890  
875  
860  
830  
810  
770  
735  
665  
580  
530  
Watts  
cfm  
1490  
1480  
1475  
1475  
1465  
1420  
1360  
1210  
1125  
1050  
L/s  
705  
700  
695  
695  
690  
670  
640  
570  
530  
495  
Watts  
cfm  
1235  
1230  
1225  
1220  
1215  
1150  
1110  
1035  
970  
L/s  
580  
580  
580  
575  
575  
540  
525  
490  
460  
420  
Watts  
485  
475  
460  
445  
430  
400  
380  
350  
325  
310  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
2160  
2100  
2035  
1965  
1885  
1780  
1690  
1575  
1375  
1225  
755  
730  
690  
650  
625  
580  
550  
505  
450  
415  
602  
585  
560  
545  
510  
490  
460  
405  
380  
365  
25  
50  
75  
100  
125  
150  
175  
200  
225  
885  
NOTES − All air data is measured external to unit without filter (not furnished − field provided).  
Air volume based on bottom air return air. Actual air volume may vary on side return air applications.  
G43UF−60C−110 PERFORMANCE (Less Filter) − Single Side Return Air − Air volumes in bold require field fabricated transi-  
tion to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) air filter in order to maintain proper air velocity.  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
Pa  
0
cfm  
2625  
2570  
2410  
2425  
2335  
2270  
2170  
2110  
2035  
1900  
L/s  
Watts  
1350  
1330  
1305  
1265  
1220  
1195  
1155  
1130  
1090  
1055  
cfm  
L/s  
1090  
1095  
1080  
1055  
1025  
1000  
965  
Watts  
cfm  
L/s  
890  
900  
910  
905  
900  
895  
875  
845  
825  
785  
Watts  
cfm  
L/s  
715  
745  
765  
770  
775  
775  
770  
750  
725  
695  
Watts  
700  
700  
690  
675  
660  
640  
630  
610  
580  
565  
1240  
1215  
1135  
1145  
1100  
1070  
1025  
995  
2310  
2325  
2285  
2230  
2175  
2120  
2045  
1950  
1885  
1760  
1080  
1060  
1035  
990  
1885  
1910  
1930  
1925  
1910  
1895  
1860  
1795  
1745  
1665  
885  
865  
845  
825  
810  
785  
765  
730  
705  
680  
1515  
1575  
1620  
1635  
1640  
1640  
1630  
1590  
1540  
1470  
25  
50  
75  
100  
125  
150  
175  
200  
225  
950  
935  
885  
920  
855  
960  
890  
820  
895  
830  
780  
G43UF−60C−110 PERFORMANCE (Less Filter) − Bottom Return Air, Side Return Air with Optional RAB Return Air Base, Re-  
turn Air from Both Sides or Return Air from Bottom and One Side.  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
Pa  
0
cfm  
L/s  
Watts  
1385  
1355  
1315  
1275  
1250  
1205  
1185  
1150  
1090  
1050  
cfm  
L/s  
1135  
1125  
1110  
1080  
1055  
1025  
990  
Watts  
cfm  
L/s  
970  
955  
955  
955  
960  
930  
905  
880  
855  
805  
Watts  
cfm  
L/s  
765  
815  
795  
800  
800  
820  
810  
795  
765  
725  
Watts  
710  
735  
690  
675  
660  
665  
650  
635  
610  
590  
2720  
2665  
2585  
2505  
2435  
2350  
2255  
2160  
2020  
1910  
1285  
1255  
1220  
1180  
1150  
1110  
1065  
1020  
955  
2410  
2385  
2350  
2290  
2235  
2170  
2100  
2005  
1905  
1820  
1090  
1075  
1015  
990  
940  
930  
895  
840  
825  
795  
2055  
2025  
2030  
2025  
2030  
1975  
1915  
1865  
1810  
1705  
935  
885  
865  
840  
830  
790  
765  
730  
710  
675  
1620  
1730  
1680  
1695  
1695  
1735  
1720  
1680  
1625  
1540  
25  
50  
75  
100  
125  
150  
175  
200  
225  
945  
900  
900  
860  
NOTES − All air data is measured external to unit without filter (not furnished − field provided).  
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BLOWER/WATTS DATA  
G43UF−60D−135 PERFORMANCE (Less Filter) − Single Side Return Air − Air volumes in bold require field fabricated transi-  
tion to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) air filter in order to maintain proper air velocity.  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
Pa  
0
cfm  
L/s  
Watts  
1440  
1405  
1370  
1330  
1290  
1265  
1230  
1190  
1160  
1110  
cfm  
L/s  
1095  
1090  
1075  
1055  
1025  
1000  
970  
Watts  
cfm  
L/s  
880  
905  
910  
905  
900  
890  
865  
845  
810  
780  
Watts  
cfm  
L/s  
665  
690  
740  
750  
750  
755  
745  
730  
715  
680  
Watts  
690  
685  
675  
670  
655  
645  
630  
605  
590  
570  
2665  
2615  
2530  
2470  
2380  
2310  
2200  
2120  
2025  
1930  
1260  
1235  
1195  
1165  
1125  
1090  
1035  
1000  
955  
2325  
2310  
2280  
2235  
2175  
2120  
2055  
1970  
1890  
1800  
1100  
1065  
1055  
1015  
985  
1865  
1915  
1925  
1920  
1910  
1890  
1835  
1790  
1720  
1655  
890  
865  
850  
825  
805  
790  
765  
740  
710  
685  
1410  
1465  
1570  
1590  
1590  
1595  
1580  
1545  
1515  
1440  
25  
50  
75  
100  
125  
150  
175  
200  
225  
965  
935  
930  
900  
890  
875  
910  
850  
835  
NOTES − All air data is measured external to unit without filter (not furnished − field provided).  
G43UF−60D−135 PERFORMANCE (Less Filter) − Bottom Return Air, Side Return Air with Optional RAB Return Air Base,  
Return Air from Both Sides or Return Air from Bottom and One Side.  
External Static  
Pressure  
Air Volume / Watts at Different Blower Speeds  
Medium−High Medium−Low  
High  
Low  
in. w.g.  
0.00  
0.10  
0.20  
0.30  
0.40  
0.50  
0.60  
0.70  
0.80  
0.90  
Pa  
0
cfm  
2730  
2670  
2600  
2525  
2445  
2360  
2290  
2205  
2110  
1970  
L/s  
Watts  
1465  
1440  
1400  
1360  
1325  
1280  
1255  
1220  
1195  
1120  
cfm  
L/s  
1145  
1135  
1115  
1095  
1065  
1035  
1005  
960  
Watts  
cfm  
L/s  
970  
975  
965  
960  
955  
925  
895  
860  
830  
795  
Watts  
cfm  
L/s  
735  
750  
765  
760  
760  
760  
755  
740  
725  
725  
Watts  
680  
675  
665  
655  
645  
635  
615  
600  
580  
545  
1290  
1260  
1225  
1190  
1155  
1115  
1080  
1040  
995  
2425  
2400  
2365  
2315  
2260  
2195  
2130  
2035  
1945  
1835  
1125  
1100  
1070  
1045  
1015  
985  
2055  
2065  
2045  
2035  
2020  
1960  
1900  
1825  
1765  
1680  
915  
890  
865  
845  
820  
790  
755  
730  
710  
690  
1560  
1590  
1620  
1615  
1615  
1610  
1600  
1570  
1540  
1540  
25  
50  
75  
100  
125  
150  
175  
200  
225  
965  
910  
915  
880  
930  
865  
830  
NOTES − All air data is measured external to unit without filter (not furnished − field provided).  
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Contact us at 1−800−4−LENNOX  
NOTE − Due to Lennox’ ongoing committment to quality, Specifications, Ratings and Dimensions subject to change without notice and without incurring liability.  
Improper installation, adjustment, alteration, service or maintenance can cause property damage or personal injury.  
Installation and service must be performed by a qualified installer and servicing agency.  
©2005 Lennox Industries Inc.  
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