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INSTALLATION INSTRUCTIONS
80G2UH-V
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.
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.
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
507335-03
This manual must be left with the homeowner for future reference.
WARNING
WARNING
Table of Contents
Unit Dimensions ..........................................................2
Parts Arrangement.......................................................3
80G2UH-V Gas Furnace .............................................4
Shipping and Packing List ...........................................4
Safety Information .......................................................4
General ........................................................................5
Combustion, Dilution & Ventilation Air .........................6
Setting Equipment .......................................................8
Filters .........................................................................11
Duct System ..............................................................11
Gas Piping .................................................................22
Electrical ....................................................................24
Adjusting Airflow ........................................................28
Start-Up .....................................................................29
Maintenance ..............................................................35
Control Diagnostics ...................................................36
Planned Service ........................................................37
Repair Parts List ........................................................37
*P507335-03*
Issue 2302
Warm Air Gas Furnace
Upflow/Horizontal
Left/Right Air Discharge
(P) 507335-03
Page 1 of 39
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Summary of Contents for Lennox 80G2UH-V
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Page 1: Table Of Contents
Improper installation, adjustment, alteration, service Parts Arrangement............3 or maintenance can cause property damage, personal 80G2UH-V Gas Furnace ..........4 injury or loss of life. Installation and service must be Shipping and Packing List ...........4 performed by a licensed professional installer (or Safety Information ............4... -
Page 2: Unit Dimensions
Unit Dimensions 3-1/8 (79) SUPPLY AIR FLUE OUTLET OPENING (Top) OPTIONAL 23-3/4 EXTERNAL (603) SIDE RETURN AIR FILTER KIT (635) (Either Side) TOP VIEW 27-3/4 3/4 (19) (705) Front Panel 3-1/4 (83) 9/16 19-7/16 3 (76) Right 9/16 (14) (14) (494) 6-3/4 (171) Left FLUE OUTLET... -
Page 3: Parts Arrangement
Parts Arrangement HEAT EXCHANGER COMBUSTION AIR INDUCER COMBUSTION AIR INDUCER PRESSURE SWITCH GAS VALVE CABINET BURNER BOX CONTROL BOX ACCESS PANELS (Includes two-stage integrated control, transformer and circuit breaker) BLOWER ASSEMBLY Figure 1. 507335-03 Issue 2302 Page 3 of 39... -
Page 4: 80G2Uh-V Gas Furnace
Adequate clearance must be made around the air openings into the vestibule area. In order to ensure proper unit The 80G2UH-V gas furnace is shipped ready for operation, combustion and ventilation air supply must be installation in the upflow or horizontal position (left or right). -
Page 5: General
be provided for combustion air requirements during Heating Unit Installed Parallel to Air Handler Unit construction. A room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is prohibited. The input rate and temperature rise must be set per the furnace rating plate. -
Page 6: Combustion, Dilution & Ventilation Air
• Place the furnace as close to the center of the air fireplaces, exhaust fans, or clothes dryers are used at the distribution system as possible. The furnace should same time as the furnace, much more air is necessary to also be located close to the chimney or vent termination ensure proper combustion and to prevent a downdraft. - Page 7 Confined Space Air from Outside A confined space is an area with a volume less than 50 If air from outside is brought in for combustion and cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of ventilation, the confined space must have two permanent the combined input rating of all appliances installed in that openings.
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Page 8: Setting Equipment
Setting Equipment WARNING Do not install the furnace on its front or its back. Do not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of the safety control devices, which could result in personal injury or death. - Page 9 Type of Vent Type C Type B1 Connector 1 in. (25 mm) 1 in. (25 mm) Figure 9. Single Side Return Air * Front 2-1/4 in. (57 mm) 2-1/4 in. (57 mm) (with transition and filter) Back Sides 0† Removing the Bottom Panel Vent 6 in.
- Page 10 Horizontal Applications The furnace can be installed in horizontal applications. Order horizontal suspension kit (51W10) or use equivalent suspension method. Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or alcove installations are shown in Figure 11. This furnace may be installed in either an attic or a crawl Type of Vent Type C...
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Page 11: Filters
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 the living space. Use screws and joint tape to seal the return air system to the furnace. In platform installations with bottom return air, the furnace should be sealed airtight to the return air plenum. - Page 12 Supply Air Plenum If the furnace is installed without a cooling coil, a removable access panel must be installed in the supply air duct. The access panel should be large enough to permit inspection (either by smoke or reflected light) of the heat exchanger for leaks after the furnace is installed.
- Page 13 • Disconnect pressure switch hose from barbed fitting on the pressure switch assembly. Remove pressure switch assembly • Remove make-up box assembly (2 screws) and cut wire tie to (1 screw) and cut wire tie to free pressure switch wires. Reinstall free make-up box wires.
- Page 14 The venting tables in this manual were extracted from the National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are provided as a guide for proper vent installation. Proper application, termination, construction and location of vents must conform to local codes having jurisdiction. In the absence of local codes, the NFGC serves as the defining document.
- Page 15 DO NOT insulate the space between the liner and the Masonry chimneys used to vent Category I central furnaces must be either tile lined or lined with a listed metal lining chimney wall with puffed mica or any other loose granular system or dedicated gas vent.
- Page 16 Never connect a Category I appliance to a chimney that is Maximum Horizontal Connector Diameter servicing a solid fuel appliance. If a fireplace chimney flue Connector Length in. (mm) is used to vent this appliance, the fireplace opening must ft. (m) be permanently sealed.
- Page 17 20. The common vent diameter must always be at least as Close all building doors and windows and all doors large as the largest vent connector diameter. between the space in which the appliances remaining connected to the common venting system are located 21.
- Page 18 Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category I Appliance Vent and Connector Diameter - D (inches) 3 inch 4 inch 5 inch 6 inch Height H Lateral L (feet) (feet) Appliance Input Rating in Thousands of Btu per Hour NOTE: Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system.
- Page 19 Capacity of Type B Double Wall Vents with Single Wall Metal Connectors Serving a Single Category I Appliance Vent and Connector Diameter - D (inches) 3 inch 4 inch 5 inch 6 inch Height H Lateral L (feet) (feet) Appliance Input Rating in Thousands of Btu per Hour NOTE: Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system.
- Page 20 Vent Connector Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Vent and Connector Diameter - D (inches) Vent Connector 3 inch 4 inch 5 inch 6 inch Height H Rise R Appliance Input Rating in Thousands of Btu per Hour (feet)
- Page 21 Vent Connector Capacity Type B Double Wall Vents with Single Wall Metal Connectors Serving Two or More Category I Appliances Vent and Connector Diameter - D (inches) Vent 3 inch 4 inch 5 inch 6 inch Lateral L Height H (feet) Appliance Input Rating in Thousands of Btu per Hour (feet)
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Page 22: Gas Piping
The piping should be sloped 1/4 inch (6.4 mm) per Gas Piping 15 feet (4.57 m) upward toward the meter from the furnace. The piping must be supported at proper intervals [every 8 to 10 feet (2.44 to 3.01 m)] with suitable hangers or straps. - Page 23 Left Side Piping Right Side Piping (Standard) (Alternate) AUTOMATIC AUTOMATIC GAS VALVE MANUAL GAS VALVE MANUAL (with manual MAIN SHUT-OFF (with manual MAIN SHUT-OFF VALVE shut-off valve) VALVE shut-off valve) GROUND JOINT UNION GROUND JOINT UNION DRIP LEG DRIP LEG FIELD PROVIDED AND INSTALLED...
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Page 24: Electrical
Leak Check Electrical After gas piping is completed, carefully check all field- installed piping connections for gas leaks. Use a commercially available leak detecting solution specifically ELECTROSTATIC DISCHARGE (ESD) manufactured for leak detection. Never use an open flame Precautions and Procedures to test for gas leaks. - Page 25 Refer to Figure 45 for schematic wiring diagram and Install the room thermostat according to the instructions troubleshooting and Figure 44 for field wiring. provided with the thermostat. If the furnace is being matched with a heat pump, refer to the instruction The power supply wiring must meet Class I restrictions.
- Page 26 The automatic heat staging option allows a single stage thermostat to be used with two stage furnace models (80G2UH-V). To activate this option, move the jumper pin (see Figure 32) to desired setting (5 minutes or 10 minutes). The furnace will start on 1st stage heat and...
- Page 27 Passive and Active Dehumidification Continuous Blower Operation Passive Dehumidification The comfort level of the living space can be enhanced when using this feature by allowing continuous circulation For situations where humidity control is a problem, a of air between calls for cooling or heating. The circulation dehumidification feature has been built into the variable of air occurs at half the full cooling airflow rate.
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Page 28: Adjusting Airflow
Adjusting Airflow Bottom Return Air Heating CFM @ 0 through 0.8” w.c. Cooling CFM @ 0 through 0.8” w.c. Heat Heat Heat Heat Cool Cool Cool Cool Motor Speed Model Stage Setting Setting Setting Setting Setting Setting Setting Setting Adjustment* Norm 1026 1105... -
Page 29: Start-Up
Allowable Heating Speeds Model Speed Adjust Setting "D" Setting "C" Setting "B" Setting "A" +10% Allowed Allowed Allowed Not Allowed 80G2UH070AV12 Norm Allowed Allowed Factory Setting Allowed -10% Allowed Allowed Allowed Allowed +10% Allowed Allowed Allowed Not Allowed 80G2UH090BV16 Norm Allowed Allowed Factory Setting... - Page 30 Gas Valve Operation 10. Turn ON all electrical power to the unit. See Figure 34 and Figure 35 11. Set the thermostat to desired setting. NOTE: When unit is initially started, steps 1 through STOP! Read the safety information at the beginning 11 may need to be repeated to purge air from gas line.
- Page 31 Manifold Pressure Gas Meter Clocking Chart Seconds for One Revolution NOTE: A pressure test adapter kit is available to facilitate Natural manifold pressure measurement. Capacity 1 cu ft 2 cu ft 1 cu ft 2 cu ft 1. Connect test gauge to manifold pressure tap (Figure Dial Dial Dial...
- Page 32 High Altitude Sequence of Operation The manifold pressure, gas orifice and pressure switch See Figure 36 through Figure 40 may require adjustment or replacement to ensure proper Heating operation at higher altitudes. On a call for heat from the room thermostat, the control board performs a 1 second self check.
- Page 33 Cooling The unit is set up at the factory for single stage cooling. For two stage cooling operation, clip the jumper wire located between the Y to Y2 terminals on the integrated ignition/ blower control board. If the active dehumidification feature is enabled, the circulating blower runs at 70% of the selected cooling speed as long as there is a call for dehumidification.
- Page 34 W1/W2 w1 w2 ***min 100%** W1 - Heat Demand Present 100%* w1 - Heat Demand Satisfied ***min 100%* 100%* W2 - High Heat Demand Present w2 - High Heat Demand Satisfied CALL *Percentage of Low Fire CFM ** Percentage of High Fire CFM *** User-Selected Heat Blower OFF Delay Figure 36.
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Page 35: Maintenance
Filters Maintenance All filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure that the furnace operates properly. Replacement filters must be rated for high velocity airflow. WARNING Table 1 lists recommended filter sizes. ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD Flue and Chimney... -
Page 36: Control Diagnostics
High Heat State LED Control Diagnostics On 80G2UH-V models, a green LED is provided on the control board to indicate high heat state (see Table 17). Troubleshooting CFM LED Make the following visual checks before troubleshooting: On 80G2UH-V models equipped with a variable speed... -
Page 37: Planned Service
Planned Service The following items should be checked during an annual inspection. Power to the unit must be shut off for the service technician’s safety. Fresh air grilles and louvers (on the unit and in the Operating performance - Unit must be observed during room where the furnace is installed) - Must be open and operation to monitor proper performance of the unit and unobstructed to provide combustion air. - Page 38 PRESSURE SWITCH (HIGH) PURPLE INDUCED DRAFT AUX. AUX. HOT SURFACE PINK BLOWER IGNITOR ROLLOUT ROLLOUT LIMIT LIMIT LIMIT PRESSURE BLUE BLUE BLUE SWITCH (LOW) GAS VALVE FLAME SENSOR M C HI 2 PIN CONNECTOR INTERLOCK SWITCH NEUTRAL GROUND 120/1/60 IGNITION CONTROL 5 PIN CONNECTOR...
- Page 39 NEUTRAL L1 HOT 120/1/60 INTERLOCK SWITCH HOT SURFACE IGNITER INDUCED DRAFT BLOWER IND HIGH IND LOW HUMIDIFIER AIR CLEANER CIRCULATION BLOWER 120V TRANSFORMER FLAME SENSOR 1ST STAGE 2ND STAGE GAS VALVE ROLLOUT ROLLOUT IGNITION SWITCH SWITCH CONTROL (IF USED) PRESSURE W1 W2 SWITCH PRESSURE...