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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.
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
Unit Dimensions ..........................................................2
Parts Arrangement.......................................................3
Gas Furnace ................................................................4
Shipping and Packing List ...........................................4
Safety Information .......................................................4
General ........................................................................6
Installation .................................................................10
Filters .........................................................................13
Duct System ..............................................................14
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
507266-05
INSTALLATION INSTRUCTIONS
95G2UHV
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.
CAUTION
Table of Contents
Save these instructions for future reference
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.
Venting Practices .......................................................15
Condensate Piping ....................................................34
Gas Piping .................................................................37
Electrical ....................................................................40
Blower Performance ..................................................48
Unit Start-Up ..............................................................52
Other Unit Adjustments..............................................54
Service.......................................................................55
Repair Parts List ........................................................57
*P507266-05*
Issue 1933
WARNING
(P) 507266-05
Page 1 of 58
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Summary of Contents for Lennox 95G2UHV
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Page 1: Table Of Contents
Filters .................13 Service...............55 Duct System ..............14 Repair Parts List ............57 Manufactured By *P507266-05* Allied Air Enterprises LLC A Lennox International, Inc. Company 215 Metropolitan Drive (P) 507266-05 West Columbia, SC 29170 Save these instructions for future reference 507266-05 Issue 1933... -
Page 2: Unit Dimensions
2 Optional External Side Return Air Filter kit is not for use with optional Return Air Base. * Consider sizing requirements for optional IAQ equipment before cutting side return opening. FRONT VIEW SIDE VIEW Model 95G2UHV 045-12 17-1/2 16-3/8 7-5/8 070-12 090-12... -
Page 3: Parts Arrangement
Parts Arrangement Figure 1. 507266-05 Issue 1933 Page 3 of 58... -
Page 4: Gas Furnace
1 - Snap Plug 1 - Wire tie The 95G2UHV can be installed as either a Direct Vent or a Non-Direct Vent Gas Central Furnace. 1 - Condensate trap 1 - Condensate trap cap... - Page 5 Building Codes When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, In the USA, installation of gas furnaces must conform with installation must conform with the current National local building codes. In the absence of local codes, units Electric Code, ANSI/NFPA No.
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Page 6: General
Use of Furnace as a Construction Heater NOTWITHSTANDING THE FOREGOING, INSTALLER IS RESPONSIBLE FOR CONFIRMING THAT THE USE Units may be used for heating of buildings or structures OF CONSTRUCTION HEAT IS CONSISTENT WITH under construction, if the following conditions are met to THE POLICIES AND CODES OF ALL REGULATING ensure proper operation. - Page 7 Combustion, Dilution & Ventilation Air of ANSI on the referenced subject, which is represented only by the standard in its entirely. If this unit is installed as a Non-Direct Vent Furnace, follow the guidelines in this section. In Canada, refer to the CSA B149 Installation codes. NOTE: In Non-Direct Vent Installations, combustion air is taken from indoors and flue gases are discharged outdoors.
- Page 8 terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room. Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially dangerous negative pressure condition.
- Page 9 Roof Terminated Exhaust Pipe Inlet Air Minimum 12 in. (305mm) Ventilation Furnace above Crawl Louvers (Crawl Space) Space Floor Coupling or *Intake Debris Screen Provided 3 in. to 2 in. Transition (Field Provided) * See Maximum Vent Lengths table NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm Figure 8.
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Page 10: Installation
Allow for clearances to combustible materials as indicated Installation on the unit nameplate. Setting Equipment WARNING 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 11 Return Air Guidelines Return air can be brought in through the bottom or either WARNING side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make Improper installation of the furnace can result in an airtight seal between the bottom of the furnace and the personal injury or death.
- Page 12 Horizontal Applications WARNING Do not install the furnace on its front or its back. See Figure 17. Figure 15. Side Return Air Figure 17. (with transition and filter) This furnace can be installed in horizontal applications with either right or left hand air discharge. Removing the Bottom Panel Remove the two screws that secure the bottom cap to the Refer to Figure 18 for clearances in horizontal applications.
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Page 13: Filters
Suspended Installation of Horizontal Unit Route auxiliary drain line so that water draining from this outlet will be easily noticed by the homeowner. This furnace may be installed in either an attic or a crawl space. Either suspend the furnace from roof rafters or floor If necessary, run the condensate line into a condensate joists, as shown in Figure 19, or install the furnace on a pump to meet drain line slope requirements. -
Page 14: Duct System
Duct System CAUTION Use industry approved standards to size and install the Solvent cements for plastic pipe are flammable liquids supply and return air duct system. This will result in a quiet and should be kept away from all sources of ignition. and low-static system that has uniform air distribution. -
Page 15: Venting Practices
IMPORTANT surface of fitting and male end of pipe to depth of fitting socket. 95G2UHV exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when NOTE: Time is critical at this stage. Do not allow using PVC vent pipe. - Page 16 Exhaust Piping system has been installed improperly, you must correct the system as indicated in the general venting requirements In areas where piping penetrates joist or interior walls, section. hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger. When furnace is installed in a residence where unit WARNING is shut down for an extended period of time, such...
- Page 17 Exhaust Piping Seal any unused openings in the common venting system. Route piping to outside of structure. Continue with installation following instructions given in piping termination Inspect the venting system for proper size and section. horizontal pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.
- Page 18 Use the following steps to correctly size vent pipe diameter. 045, 070, Furnace capacity? 090, 110, 135 btuh NOTE: All horizontal runs of exhaust pipe must slope back toward unit. A minimum of 1/4” (6 mm) drop for each 12” (305 mm) of horizontal run is mandatory for drainage.
- Page 19 Maximum Allowable Intake or Exhaust Vent Length in Feet Standard Termination at Elevation 0 - 4,500 ft 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3" Pipe Number of 90° Capacity Capacity Capacity Capacity Elbows Used Standard Termination Elevation 4,501 - 10,000 ft 1-1/2"...
- Page 20 Maximum Allowable Intake or Exhaust Vent Length in Feet Concentric Termination at Elevation 0 - 4,500 ft 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3" Pipe Number of 90° Capacity Capacity Capacity Capacity Elbows Used Concentric Termination Elevation 4,501 - 10,000 ft 1-1/2"...
- 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 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3" Pipe Number of 90°...
- Page 22 TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS Pipe size determined in Table 5 2” 2” 2” 2” 3” 2” TRANSITION EXHAUST *2” 045/070 Only 1-1/2” DO NOT transition from smaller to larger TRANSITION pipe in horizontal runs 2”...
- Page 23 TYPICAL INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS 2” 3” Pipe size determined in Table 5 TRANSITION INTAKE *2” 2” 2” 2” 2” * 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 Roof Terminated exposure to exhaust condensate can destroy protective 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 Maximum Allowable Exhaust Vent Pipe Length (in ft.) without Insulation in Unconditioned Space for Winter Design Temperatures Unit Input Size Vent Pipe Winter Design Temperatures1 ºF (ºC) Diameter 1-1/2 in. 32 to 21 2 in. (0 to -6) 2-1/2 in. 3 in.
- Page 27 VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL Fixed Operable Fixed Closed Closed Operable AREA WHERE TERMINAL AIR SUPPLY INLET VENT TERMINAL IS NOT PERMITTED US Installations Canadian Installations Clearance above grade, veranda, 12 inches (305mm) or 12 in.
- Page 28 VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA INSIDE CORNER DETAIL Fixed Operable Fixed Closed Closed Operable AREA WHERE TERMINAL AIR SUPPLY INLET VENT TERMINAL IS NOT PERMITTED US Installations Canadian Installations Clearance above grade, veranda, 12 inches (305mm) or 12 in.
- Page 29 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 used and the flue gasses may impinge on the building material, a corrosion resistant shield (minimum 24 inches square) should be used to protect the wall surface.
- Page 30 If intake and exhaust piping must be run up a side wall to position above snow accumulation or other obstructions, piping must be supported every 24” (610 mm) as shown in Figure 44. Exhaust and intake piping that is run up a wall is considered to be in an unconditioned space, so piping should be sized according to Table 6.
- Page 31 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 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 SIZE TERMINATION is preferred. Figure 45 through Figure 48 show typical PER EXHAUST PIPE 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.
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Page 34: Condensate Piping
Figure 54 and Figure 55 show the furnace and Condensate Piping evaporator coil using a separate drain. If necessary the condensate line from the furnace and evaporator This unit is designed for either right or left side exit of coil can drain together. See Figure 56 and Figure 57. condensate piping in upflow applications. - Page 35 *Piping from furnace must slope down a minimum of 1/4” per ft. toward trap. Figure 54. Condensate Trap Locations (Unit shown in horizontal right hand discharge position using a separate drain) Figure 55. Unit with Evaporator Coil Using a Separate Drain Figure 56.
- Page 36 Figure 58. Trap / Drain Assembly Using 1/2” PVC or 3/4” PVC Page 36 of 58 Issue 1933 507266-05...
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Page 37: Gas Piping
IMPORTANT IMPORTANT When combining the furnace and evaporator coil A low inlet pressure switch in LP/propane applications drains together, the A/C condensate drain outlet must is recommended. be vented to relieve pressure in order for the furnace pressure switch to operate properly. When connecting gas supply, factors such as length of run, number of fittings and furnace rating must be considered to avoid excessive pressure drop. - Page 38 Upflow Application Upflow Application AUTOMATIC Left Side Piping Right Side Piping GAS VALVE (Standard) (with manual (Alternate) shut-off valve) MANUAL MAIN SHUT-OFF VALVE MANUAL MAIN SHUT-OFF VALVE GROUND GROUND JOINT JOINT UNION UNION DRIP LEG Gas Valve Gas Valve FIELD PROVIDED AND INSTALLED DRIP LEG...
- Page 39 Gas Pipe Capacity - FT³/HR (kL/HR) Nominal Length of 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)
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Page 40: Electrical
Refer to Figure 72 for field wiring and Figure 73 for Electrical schematic wiring diagram and troubleshooting. The power supply wiring must meet Class I restrictions. ELECTROSTATIC DISCHARGE (ESD) Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit Precautions and Procedures nameplate. - Page 41 The automatic heat staging option allows a single stage furnace on either permanent or temporary power. thermostat to be used with two stage furnace models (95G2UHV). To activate this option, move the jumper • Generator should have a wave form distortion of less pin (see Figure 65) to desired setting (5 minutes or 10 than 5% THD (Total Harmonic Distortion).
- Page 42 Electronic Air Cleaner LED on the control board flashes. Each flash signifies 100 CFM; count the flashes and multiply by 100 to determine Terminals are provided on the integrated ignition/blower the actual CFM delivered (for example: 10 flashes x 100 = control board for connection of a 120-volt electronic air 1000 CFM).
- Page 43 Sequence of Operation Cooling Heating The unit is set up at the factory for single stage cooling. For two stage cooling operation, clip the jumper wire located On a call for heat from the room thermostat, the control between the Y to Y2 terminals on the integrated ignition/ board performs a 1 second self check.
- Page 44 Figure 67. Indoor Blower Operation - 1st Stage-2nd Stage (W1/W2) Heat Call Figure 70. Indoor Blower Operation - Single Stage Cooling Figure 68. Indoor Blower Operation - High Heat (W2) Call * Percentage of High Stage Cooling Figure 69. Indoor Blower Operation - Call for Fan * Percentage of High Stage Cooling Figure 71.
- Page 45 High Heat State LED If the variable speed motor needs to be replaced in an On 95G2UHV models, a green LED is provided on the emergency situation (such as “no heat”) and an exact control board to indicate high heat state (see Table 11).
- Page 46 WARNING: ELECTRIC SHOCK HAZARD, CAN CAUSE INJURY OR DEATH. UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES NOTE: IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT MUST BE REPLACED WITH WIRE OF LIKE SIZE, RATING, INSULATION THICKNESS AND TERMINATION FIELD SUPPLIED ACC.
- Page 47 NOTES: PRESS AND RELEASE FAULT CODE HISTORY BUTTON TO DISPLAY FAULT CODES. TO ERASE CODES, PRESS AND HOLD BUTTON IN FOR MORE THAN 5 SECONDS IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BE REPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMP.
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Page 48: Blower Performance
Blower Performance 95G2UH045BV12 Heating CFM @ 0 - 0.8” w.c. Temp. Rise Speed Adjustment Setting D Setting C Setting B Setting A 1005 High Fire Normal 35-65 Low Fire Normal 20-50 Cooling Stage Cooling CFM @ 0 - 0.8” w.c. 1075 1210 1370... - Page 49 95G2UH090CV12 Heating CFM @ 0 - 0.8” w.c. Temp. Rise Speed Adjustment Setting D Setting C Setting B Setting A 1060 1135 1240 1315 High Fire Normal 1040 1120 1199 60-90 1084 1040 1120 1206 Low Fire Normal 1100 35-65 Cooling Stage Cooling CFM @ 0 - 0.8”...
- Page 50 95G2UH110CV20 Heating CFM @ 0 - 0.8” w.c. Temp. Rise Speed Adjustment Setting D Setting C Setting B Setting A 1560 1760 1905 1955 High Fire Normal 1415 1610 1740 1795 45-75 1285 1485 1560 1635 1155 1325 1420 1500 Low Fire Normal 1055...
- Page 51 Allowable Heating Speeds Model Number Speed Adjust Setting "D" Setting "C" Setting "B" Setting "A" +10% Allowed Allowed Allowed Allowed 95G2UH045BV12 Norm Allowed Allowed Factory Setting Allowed -10% Allowed Allowed Allowed Allowed +10% Allowed Allowed Allowed Not Allowed 95G2UH070BV12 Norm Allowed Allowed Factory Setting...
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Page 52: Unit Start-Up
Placing the Furnace into Operation Unit Start-Up This furnace is equipped with an automatic hot surface ignition system. Do not attempt to manually light burners FOR YOUR SAFETY READ BEFORE OPERATING on this furnace. Each time the thermostat calls for heat, the burners will automatically light. - Page 53 Turning Off Gas to Unit control will then automatically repeat steps 1 through 6 after 60 minutes. To interrupt the 60 minute period, Set the thermostat to the lowest setting. move thermostat from “Heat” to “OFF” then back to Turn off all electrical power to the unit if service is to “Heat”.
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Page 54: Other Unit Adjustments
Pressure Switch For proper furnace operation the minimum gas supply pressure is 4.5” w.c and the maximum gas supply pressure The pressure switch is located in the heating compartment is 10.5” w.c for natural gas. The minimum gas supply on the cold end header box. This switch checks for proper pressure is 10”... -
Page 55: Service
Check amp-draw on the blower motor. Service Motor Nameplate__________Actual__________ Winterizing and Condensate Trap Care WARNING Turn off power to the furnace. Have a shallow pan ready to empty condensate water. ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD. Remove the clean out cap from the condensate trap and empty water. - Page 56 18. Mark and disconnect any remaining wiring to heating 39. Secure burner assembly to vestibule panel using four compartment components. Disengage strain relief existing screws. Burners are self aligning to center of bushing and pull wiring and bushing through the hole clam shells.
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Page 57: Repair Parts List
Planned Service Repair Parts List A service technician should check the following items during an annual inspection. Power to the unit must be The following repair parts are available through Allied Air shut off for safety. dealers. When ordering parts, include the complete furnace Fresh air grilles and louvers (on the unit and in the model number listed on the CSA nameplate. - 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...