Lennox A95UH2E Installation Instructions Manual
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Lennox A95UH2E Installation Instructions Manual

Lennox A95UH2E Installation Instructions Manual

Warm air gas furnace upflow/horizontal left air discharge direct vent & non-direct vent
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This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
Unit Dimensions ..........................................................2
Parts Arrangement.......................................................3
Gas Furnace ................................................................4
Shipping and Packing List ...........................................4
Safety Information .......................................................5
General ........................................................................6
Combustion, Dilution & Ventilation Air .........................7
Installation .................................................................10
Filters .........................................................................13
Duct System ..............................................................13
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
507281-06
INSTALLATION INSTRUCTIONS
A95UH2E & 95G2UHE
Warm Air Gas Furnace
Upflow/Horizontal Left Air Discharge
Direct Vent & Non-Direct Vent
This manual must be left with the homeowner for future reference.

Table of Contents

CAUTION
Save these instructions for future reference
Venting Practices .......................................................16
Condensate Piping ....................................................34
Gas Piping .................................................................38
Electrical ....................................................................41
Unit Start-Up ..............................................................50
Other Unit Adjustments..............................................52
Blower Performance ..................................................53
Service.......................................................................55
Planned Service ........................................................57
Repair Parts List ........................................................57
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.
Issue 1724
WARNING
*507281-06*
*507281-06*
Page 1 of 58

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  • Page 1: Table Of Contents

    (or equivalent), service agency or the gas supplier. Manufactured By *507281-06* Allied Air Enterprises LLC A Lennox International, Inc. Company 215 Metropolitan Drive *507281-06* West Columbia, SC 29170 Save these instructions for future reference...

  • Page 2: Unit Dimensions

    Unit Dimensions EXHAUST AIR 3−3/8 NOTE - 20 C/D (5 Ton) size units installed in upflow applications OUTLET (86) that require air volumes of 1800 cfm (850 L/s) or greater must have one of the following: 2 (51) 1. Single side return air with transition, to accommodate 20 x 25 x 1 in.

  • Page 3: Parts Arrangement

    Parts Arrangement Figure 1. 507281-06 Issue 1724 Page 3 of 58...

  • Page 4: Gas Furnace

    The bottom panel must be removed if the unit is to be installed in horizontal or upflow applications with bottom return air. The A95UH2E/95G2UHE can be installed as either a Direct Vent or a Non-Direct Vent Gas Central Furnace. The furnace is equipped for installation in natural gas applications.

  • Page 5: Safety Information

    With a parallel flow arrangement, a damper (or other means to control the flow of air) must adequately A95UH2E/95G2UHE units are CSA International certified prevent chilled air from entering the furnace. If the damper to ANSI Z21.47 and CSA 2.3 standards.

  • Page 6: General

    • A room thermostat must control the furnace. The use Heating Unit Installed Parallel to Air Handler Unit of fixed jumpers that will provide continuous heating is not allowed. • The return air duct must be provided and sealed to the furnace.

  • Page 7: Combustion, Dilution & Ventilation Air

    NOTE: The Commonwealth of Massachusetts stipulates In the past, there was no problem in bringing in sufficient these additional requirements: outdoor air for combustion. Infiltration provided all the air that was needed. In today’s homes, tight construction • Gas furnaces shall be installed by a licensed plumber practices make it necessary to bring in air from outside or fitter only.
  • Page 8 Unconfined Space An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet (1.42 m³) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that space.
  • Page 9 Figure 8. Equipment in Confined Space - All Air from Outside Figure 6. Equipment in Confined Space - All Air from Ventilation Louvers Outside Inlet Air Roof Terminated (Minimum (Inlet Air from Crawl Space and Outlet Air to Exhaust Pipe 12 in.(305mm) Above Ventilated Attic) attic floor)

  • Page 10: Installation

    When ducts are used, they shall be of the same cross- Installation sectional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In Setting Equipment calculating free area, the blocking effect of louvers, grilles, or screens must be considered.
  • Page 11 Allow for clearances to combustible materials as indicated on the unit nameplate. WARNING Improper installation of the furnace can result in personal injury or death. Combustion and flue products must never be allowed to enter the return air system or air in the living space.
  • Page 12 Horizontal Applications Markings are provided on both sides of the furnace cabinet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on Page 2. WARNING Furnace applications which include side return air and a Do not install the furnace on its front or its back.

  • Page 13: Filters

    Suspended Installation of Horizontal Unit Continue with exhaust, condensate and intake piping installation according to instructions. This furnace may be installed in either an attic or a crawl space. Either suspend the furnace from roof rafters or floor joists, as shown in Figure 19, or install the furnace on a platform, as shown in Figure 20.
  • Page 14 InnoFlue® by Centrotherm ULC-S636 IMPORTANT Table 2. A95UH2E/95G2UHE 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 fitting in the unit.
  • Page 15 STANDARD CONCENTRIC Outdoor Outdoor Exhaust 1-1/2” 2” 3” Exhaust Flush Accelerator Concentric Concentric Concentric VENT Accelerator Mount Kit Model PIPE DIA. (Dia. X Length) (Dia. X Length) (in.) 71M80 69M29 60L46 1-1/2” X 12” 2” X 12” 51W11** or 44W93† †44W92††...

  • Page 16: Venting Practices

    Uniformly apply a liberal coat of PVC primer for PVC Venting Practices 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. Piping Suspension Guidelines NOTE: Time is critical at this stage.
  • Page 17 WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death. The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:...
  • Page 18 Regardless of the diameter of pipe used, the standard roof Use the following steps to correctly size vent pipe diameter. and wall terminations described in the following sections should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the 045, 070, termination.
  • Page 19 Maximum Allowable Intake or Exhaust Vent Length (feet) Standard Termination at Elevation 0 - 4,500 ft 2” Pipe 2-1/2” Pipe 3” Pipe Number of Modal Model Model 90° Elbows Used Standard Termination at Elevation 4,501 - 10,000 ft 2” Pipe 2-1/2”...
  • Page 20 Maximum Allowable Intake or Exhaust Vent Length (feet) Concentric Termination at Elevation 0 - 4,500 ft 2” Pipe 2-1/2” Pipe 3” Pipe Number of Modal Model Model 90° Elbows Used Concentric Termination at Elevation 4,501 - 10,000 ft 2” Pipe 2-1/2”...
  • Page 21 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 - 4,500 ft 2” Pipe 2-1/2” Pipe 3” Pipe Number of Modal Model Model...
  • Page 22 * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE: Exhaust pipe and intake pipe must be the same diameter. Figure 24. Typical Exhaust Pipe Connections in Upflow Direct or Non-Direct Vent Applications * When transitioning up in pipe size, use the shortest length of 2”...
  • Page 23 * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE: Exhaust pipe and intake pipe must be the same diameter. Figure 26. Typical Air Intake Pipe Connections in Upflow Direct Vent Applications * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE: Exhaust pipe and intake pipe must be the same diameter.
  • Page 24 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.
  • Page 25 At vent termination, care must be taken to maintain protective coatings over building materials (prolonged exposure to exhaust condensate can destroy protective Roof Terminated Exhaust Pipe coatings). It is recommended that the exhaust outlet not be located within 6 feet (1.8 m) of a condensing unit because the condensate can damage the painted coating.
  • Page 26 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 Conditioned Space used and the flue gasses may impinge on the building...
  • Page 27 Exhaust piping must terminate straight out or up as Termination Pipe Model Exhaust Pipe Size shown. A reducer may be required on the exhaust Size piping at the point where it exits the structure to 045 and 070 1-1/2” (38 mm) improve the velocity of exhaust away from the intake 2”...
  • Page 28 2” EXTENSION FOR 2” PVC PIPE1” EXTENSION FOR 3” 12” EXHAUST PVC PIPE (305MM) VENT 5-1/2” 5” (140mm) (127MM) FURNACE INTAKE EXHAUST PIPE 18” MAX. Front View FURNACE (457MM) INTAKE EXHAUST VENT PIPE 12” (305MM) Min. above grade or average snow GLUE EXHAUST Inches (MM) INTAKE...
  • Page 29 ‡ 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. Figure 42. Vent Termination Clearances For Direct Vent installations in the USA and Canada...
  • Page 30 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...
  • Page 31 ‡ 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. Figure 44. Vent Termination Clearances...
  • Page 32 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. Figure 45 through Figure 48 show typical terminations.
  • Page 33 Exhaust through Crawl Space Vent Option All 33” condensing gas furnaces (92%+) are now approved Exhaust from to be vented down through a crawl space. Ensure a vent Furnace pipe drain kit, 51W18 (USA) or 15Z70 (Canada), is used as To Termination directed through the floor joists and into the crawl space.

  • Page 34: Condensate Piping

    Condensate Piping CAUTION This unit is designed for either right or left side exit of Do not use copper tubing or existing copper condensate condensate piping in upflow applications. In horizontal lines for drain line. applications, the condensate trap must extend below the unit.
  • Page 35 *Piping from furnace must slope down a minimum of 1/4” per ft. toward trap. Figure 54. Unit With Evaporator Coil Figure 53. Condensate Trap Locations (Unit shown in upflow position with remote trap) *Piping from furnace must slope down a minimum of 1/4” per ft. toward trap. Figure 55.
  • Page 36 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 57. Evaporator Coil using a Common Drain Figure 56. Condensate Trap with Optional Overflow Switch *Piping from furnace must slope down a minimum of 1/4”...
  • Page 37 Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min. Vent 2 (50 mm) Max.

  • Page 38: Gas Piping

    Gas Piping IMPORTANT Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petroleum gases. CAUTION If a flexible gas connector is required or allowed by the authority that has jurisdiction, black iron pipe shall Leak Check be installed at the gas valve and extend outside the After gas piping is completed, carefully check all piping...
  • Page 39 AUTOMATIC Left Side Piping GAS VALVE Right Side Piping (with manual (Standard) (Alternate) shut-off valve) BELLOWS GROMMET MANUAL MAIN SHUT-OFF MANUAL VALVE PLUG MAIN SHUT-OFF PLUG VALVE GROUND GROUND JOINT JOINT UNION UNION DRIP LEG GAS VALVE GAS VALVE DRIP LEG BELLOWS GROMMET In LP/Propane applications, a 4”...
  • Page 40 Gas Pipe Capacity - FT³/HR (kL/HR) Nominal Length or Pipe - feet (m) Internal Iron Pipe Diameter Size - - inches inches (3.048) (6.096) (9.144) (12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480) (mm) (mm) .622 (12.7) (17.799) (4.96) (3.40) (2.75) (2.32) (2.07) (1.87)

  • Page 41: Electrical

    The unit is equipped with a field makeup box. The makeup Electrical box may be moved to the right side of the furnace to facilitate installation. Seal unused openings on left side with plugs removed from right side. Secure the excess wire ELECTROSTATIC DISCHARGE (ESD) to the existing harness to protect it from damage.
  • Page 42 Electrical Wiring One line voltage “ACC” 1/4” spade terminal is provided on the furnace integrated control. See Figure 65 for integrated control configuration. This terminal is WARNING energized when the indoor blower is operating. Any accessory rated up to one amp can be connected to Risk of electrical shock.
  • Page 43 3/16” QUICK CONNECT TERMINALS THERMOSTAT CONNECTIONS (TB1) • FLAME SENSE SIGNAL • DS = DEHUMIDIFICATION SIGNAL • HI Cool 24VAC • W2 = HEAT DEMAND FROM 2ND STAGE T/STAT • HI HEAT 24VAC • W1 = HEAT DEMAND FROM 1ST STAGE T/STAT •...
  • Page 44 Integrated Control DIP Switch Settings Blower Off Delay A95UH2E/95G2UHE units are equipped with a two-stage Switch 3 Switch 4 (Seconds) integrated control. This control manages ignition timing, heating mode fan off delays and indoor blower speeds based on selections made using the control dip switches 90 (Factory) and jumpers.
  • Page 45 Table 13A. Field Wiring Applications With Conventional Thermostat 507281-06 Issue 1724 Page 45 of 58...
  • Page 46 Table 13B. Field Wiring Applications With Conventional Thermostat (Continued) Page 46 of 58 Issue 1724 507281-06...
  • Page 47 * Connect W1 to W1 ONLY if using defrost tempering kit 67M41 NOTE - DO NOT make a wire connection between the room thermostat L terminal and the L terminal of the integrated control. Table 13C. Field Wiring Applications With Conventional Thermostat (Continued) 507281-06 Issue 1724 Page 47 of 58...
  • Page 48 * Connect W1 to W1 ONLY if using defrost tempering kit 67M41 NOTE - DO NOT make a wire connection between the room thermostat L terminal and the L terminal of the integrated control. Table 13D. Field Wiring Applications With Conventional Thermostat (Continued) Page 48 of 58 Issue 1724 507281-06...
  • Page 49 Figure 66. 507281-06 Issue 1724 Page 49 of 58...

  • Page 50: Unit Start-Up

    This furnace is equipped with an ignition device which Unit Start-Up automatically lights the burners. Do not try to light the burners by hand. FOR YOUR SAFETY, READ BEFORE OPERATING Remove the upper access panel. Move gas valve switch to OFF. See Figure 67. Wait five minutes to clear out any gas.
  • Page 51 Gas Pressure Adjustment Is the manual main shut–off valve open? Is the internal manual shut–off valve open? Gas Flow (Approximate) Is the unit ignition system in lockout? If the unit locks Gas Meter Clocking Chart out again, inspect the unit for blockages. Seconds for One Revolution Heating Sequence of Operation Natural...

  • Page 52: Other Unit Adjustments

    For proper furnace operation, the minimum gas supply kit and pressure switch requirements at varying altitudes. pressure is 4.5” w.c and the maximum gas supply pressure The combustion air pressure switch is factory-set and is 10.5” w.c for natural gas. The minimum gas supply requires no adjustment.

  • Page 53: Blower Performance

    Electrical Exhaust and Air Intake Pipe Check all wiring for loose connections. Check exhaust and air intake connections for tightness and to make sure there is no blockage. Check for the correct voltage at the furnace (furnace operating). Is pressure switch closed? Obstructed exhaust pipe will cause unit to shut off at pressure switch.
  • Page 54 A95UH0902E12 / 95G2UH090E12 Performance (Less Filter) External Air Volume / Watts at Various Blower Speeds Static High Medium-High Medium Medium-Low Pressure Watts Watts Watts Watts Watts in. w.g. 0.00 1740 1505 1370 1285 1135 0.10 1695 1470 1325 1240 1090 0.20 1660 1435...

  • Page 55: Service

    Winterizing and Condensate Trap Care Service Turn off power to the furnace. Have a shallow pan ready to empty condensate water. Remove the clean out cap from the condensate trap WARNING and empty water. Inspect the trap then reinstall the clean out cap.
  • Page 56 bushing and pull wiring and bushing through the hole 39. Secure burner assembly to vestibule panel using four in the blower deck. existing screws. Burners are self aligning to center of clam shells. 19. Remove the primary limit from the vestibule panel. 40.

  • Page 57: Planned Service

    Planned Service Return air duct - Must be properly attached and provide A service technician should check the following items an air seal to the unit. during an annual inspection. Power to the unit must be shut off for safety. Operating performance - Unit must be observed during operation to monitor proper performance of the unit and Fresh air grilles and louvers (on the unit and in the...
  • Page 58 Requirements for Commonwealth of Massachusetts Modifications to NFPA-54, Chapter 10 INSPECTION. The state or local gas inspector of the side wall, horizontally vented, gas-fueled equipment Revise NFPA-54 section 10.8.3 to add the following shall not approve the installation unless, upon requirements: inspection, the inspector observes carbon monoxide For all side wall, horizontally vented, gas-fueled equipment...

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