Lennox G43UF User Manual
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Lennox G43UF User Manual

Merit series
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See also: Unit Information , User's Information Manual
E N G I N E E R I N G D A T A
MODEL NUMBER IDENTIFICATION
Series
43 = 90% Minimum AFUE
Nominal Add−On Cooling Capacity
G 43
Unit Type
G = Gas Furnace
Configuration
UF = Up−Flow
24 = 2 tons (7.0 kW)
36 = 3 tons (10.5 kW)
48 = 4 tons (14.10 kW)
60 = 5 tons (17.5 kW)
Input − 44,000 to 132,000 Btuh
Nominal Add−on Cooling − 2 to 5 Tons
UF
−
24
B − 045
1
Cabinet Width
B = 17−1/2 in. (445 mm)
C = 21 in. (533 mm)
D = 24−1/2 in. (622 mm)
G A S F U R N A C E S
G43UF
MERIT
Bulletin No. 210394
Supersedes December 2004
AFUE − up to 92.1%
Nominal Gas Heat Input
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)
1
Indoor coils with the same letter designation
will physically match the furnace.
®
SERIES
Up−Flow
August 2005

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Summary of Contents for Lennox G43UF

  • Page 1 B − 045 Cabinet Width B = 17−1/2 in. (445 mm) C = 21 in. (533 mm) D = 24−1/2 in. (622 mm) G A S F U R N A C E S G43UF ® MERIT SERIES Up−Flow Bulletin No. 210394...

  • Page 2: Warranty

    Each unit factory test operated to ensure proper operation. DIRECT VENT / NON−DIRECT VENT Furnace can be installed in either Direct Vent or Non−Direct applications. In Direct Vent applications, combustion air is supplied from outdoors and flue gases are discharged outdoors.

  • Page 3: Heating System

    Kit consists of twinning control and two fan sensors. BLOWER Multi-speed, direct drive blower. Statically and dynamically balanced. Resiliently mounted. Blower assembly slides out of unit for servicing. Blower speeds are easily changed on the integrated furnace control board. See blower performance tables. G43UF / Page 3...
  • Page 4 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. G43UF / Page 4 OPTIONS Condensate Drain Heat Cable Kits Self-limiting wattage heat cable prevents condensate drain from freezing in unconditioned areas.

  • Page 5: Specifications

    4 − 5 (10.5 − 14.0) (14.0 − 17.5) (14.0 − 17.5) 885 − 2160 1470 − 2720 1440 − 2730 (420 − 1020) (695 − 1285) (680 − 1290) 178 (81) 186 (84) 203 (92) G43UF / Page 5...

  • Page 6: Cabinet Accessories

    −110 59M16 −135 59M16 Required for proper operation at altitudes from 7501 to 10,000 ft. (2286 to 3048 m). G43UF / Page 6 B" Width Models Size of filter − in. 87L96 − 18 x 25 x 1 (mm) (457 x 635 x 25)
  • Page 7 4 (1.2) not allowed 6 (1.8) 6 (1.8) not allowed 10 (3.0) 10 (3.0) not allowed G43UF / Page 7 2 x 12 in. (51 x 305 mm) − − − not allowed not allowed not allowed not allowed not allowed...

  • Page 8: Filter Air Resistance

    National Standard of Canada CAN/CGA-149.1 and .2. 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. G43UF / Page 8...
  • Page 9 GAS PIPING INLET (Either Side) CONDENSATE TRAP CONNECTION (Either Side) ELECTRICAL INLET (Either Side) (584) (102) OPTIONAL RETURN CUTOUT (356) (Either Side) 1−15/16 (49) 23−1/2 (597) 4−1/4 Bottom Return (108) Air Opening SIDE VIEW 19−1/2 G43UF / Page 9 9/16 (14)

  • Page 10: Optional Accessory Dimensions

    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).
  • Page 11 3 inch (76 mm) 46−3/4 (1187) 6−1/2 (165) 4−1/2 (114) INTAKE AIR EXHAUST TERMINATION ASSEMBLY (Furnished) EXHAUST PIPE SHOWN NOTE 12 in. (305 mm) minimum height above average snow accumulation. 12 in. (305 mm) maximum without support G43UF / Page 11...
  • Page 12 (305) INTAKE (127) 5-1/2 (140) É É É É É É É É É É É É G43UF / Page 12 INSULATION (Not Furnished) EXHAUST (305) É É É É É É É É É É É É É É...
  • Page 13 BLOWER/WATTS DATA G43UF−24B−045 PERFORMANCE (Less Filter) External Static External Static Pressure High in. w.g. 0.00 1125 0.10 1115 0.20 1090 0.30 1060 0.40 1020 0.50 0.60 0.70 0.80 0.90 G43UF−24B−070 PERFORMANCE (Less Filter) External Static External Static Pressure High in. w.g.
  • Page 14 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.
  • Page 15 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.
  • Page 16 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. Visit us at www.lennox.com For the latest technical information, www.lennoxdavenet.com Contact us at 1−800−4−LENNOX...

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