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Residential Gas Furnaces
Installation Instructions
G6RC Series 90+ Upflow Condensing Furnace
G6RD Series 93+ Upflow Condensing Furnace
G6RL Series 90+ Downflow Condensing Furnace
G6RC 90+, G6RD 93+ Upflow
WARNING:
!
Improper installation, adjustment, al-
teration, service, or maintenance can
cause injury or property damage. Re-
fer to this manual for assistance. For
additional information consult a quali-
fied installer, service agency, or the
gas supplier.
These instructions are primarily intended to
assist qualified individuals experienced in
the proper installation of this appliance.
Some local codes require licensed installa-
tion/service personnel for this type of equip-
ment. Read all instructions carefully before
starting the installation.
DO NOT DESTROY. PLEASE READ CARE-
FULLY AND KEEP IN A SAFE PLACE FOR
FUTURE REFERENCE.
G6RL 90+ Downflow
! FOR YOUR SAFETY:
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
! FOR YOUR SAFETY:
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instructions.
• If you cannot reach your gas supplier,
call the fire department.
• Extinguish any open flame.
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Summary of Contents for Nordyne G6RC 90+
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Page 1: For Your Safety
Residential Gas Furnaces Installation Instructions G6RC Series 90+ Upflow Condensing Furnace G6RD Series 93+ Upflow Condensing Furnace G6RL Series 90+ Downflow Condensing Furnace G6RC 90+, G6RD 93+ Upflow WARNING: Improper installation, adjustment, al- teration, service, or maintenance can cause injury or property damage. Re- fer to this manual for assistance. -
Page 3: Table Of Contents
Horizontal Venting ... 19 Vertical Venting ... 20 Vent Freezing Protection ... 20 Concentric Vent Termination ... 20 Drainage of Condensate From Furnace ... 21 Gas Supply and Piping ... 22 Leak Check ... 22 Conversion ... 23 High Altitude Application ... 23 Natural Gas High Altitude Conversion ... -
Page 4: Furnace Specifications
Upflow G6RC & G6RD Furnaces Combustion Air Inlet 23 1/4" Exhaust Vent 22 1/2" 3/4" 3/4" 19 3/4" 25 1/8" 1 1/2" x 3 1/2" Dia. Opening for Gas Connection 7/8" Dia. Electric 43" Connection 25 1/4" 15" 8" Return Air Opening (Side) 1"... - Page 5 Downflow G6RL Furnace Combustion Air Inlet 24 1/2" Exhaust Vent 22 1/2" 3/4" 3/4" 24 7/8" 7/8" Dia. Electric Connection 43" 21 7/8" 1 1/2" x 3 1/2" Dia. Opening for Gas Connection 21 1/4" 8" 1" Condensate Drain Outlet...
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Page 6: Furnace Airflow Data
Heating Model Input Motor Motor Number (Btuh) Speed High* G6RC040C-08 40,000 Medium Low** High* 1330 G6RC040C-12 40,000 Medium 1190 Low** High* 1310 G6RC060C-12 60,000 Medium 1160 Low** High* 1490 G6RC080C-12 80,000 Medium 1230 Low** High* 1840 G6RC080C-16 80,000 Med-High 1600 Med-Low** 1380 1100... - Page 7 Heating Model Input Motor Motor Number (Btuh) Speed High* G6RD080C-14 80,000 Med-High Med-Low** High* G6RD100C-14 100,000 Med-High** Med-Low High* G6RD120C-14 120,000 Med-High** Med-Low High* G6RD120C-19 120,000 Med-High Med-Low** High* G6RL040C-12 40,000 Medium Low** High* G6RL060C-12 60,000 Medium Low** High* G6RL080C-16 80,000 Med-High Med-Low**...
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Page 8: Installation Requirements
CLEARANCES TO COMBUSTIBLE MATERIALS This furnace is Designed Certified by AGA/CGA Laboratories for the minimum clearances to combustible material listed in Table 4. See the furnace name plate, located inside the furnace cabinet, for specific model number and clearance information. -
Page 9: Horizontal Installations
A gas-fired furnace installed in a residential garage must be installed so that the bottom of the furnace is located a minimum of 15" from the floor. The furnace must be located or protected to avoid physical damage by vehicles. -
Page 10: Circulating Air Supply
19.75" or 14.25"* Figure 7. Downflow Sub-Base Dimensions If outside air is utilized as return air to the furnace for ventilation or to improve indoor air quality, the system must be designed so that the return air to the furnace is not less than 50°F (10°C) during heating operation. -
Page 11: Return Air
VENTING AND COMBUSTION AIR REQUIREMENTS NORDYNE condensing furnaces may be in- stalled with outdoor combustion air piped di- rectly to the furnace, or without such special piping. Codes refer to the former as "direct vent"... - Page 12 Vent or Each opening must Chimney be at least 100 sq. in. or 1 sq. in. per 1000 Btuh of total input rating, whichever is greater. See minimum Furnace Water Heater Minimum Total Input Free Area Rating (Btuh) (Each Opening) 40,000 100 sq.
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Page 13: Air Requirements For One-Pipe Installation
It should be installed on the combustion air intake collar or inlet PVC. If furnace location is such that this opening might be unintentionally ob- structed, a 3" PVC elbow should be installed on the collar, and the screen placed inside the inlet of the elbow. -
Page 14: Air Directly Through An Exterior Wall
NORDYNE condensing furnaces are classified as "Category IV" appliances, which require spe- cial venting materials and installation proce- dures. Category IV appliances operate with positive vent pressure and therefore require vent systems which are thoroughly sealed. -
Page 15: Vent Pipe Installation
Proper use of the table is illustrated by the following example: Example: An 80,000 Btuh furnace is to be installed in a "one-pipe" system with 40 feet of vent piping. There are four elbows, including those exterior to the building. - Page 16 Straps or Other Suitable Supports at Minimum of 5 ft. Intervals Coupling Upward Pitch - 1/4" per Foot Outlet Exhaust Vent First Support Placed as Close to Furnace Wall Connection as Possible Exhaust Vent See Vent Table 4 Straps or Other Suitable...
- Page 17 Combustion Air Inlet Pipe Collar Diameter 3" for coupling or reducer Furnace Top 2" PVC Exhaust Vent All Models Figure 16. Furnace Pipe Adaptions Support System on Vertical Rise Below Joints Support System with first support as close to furnace as Possible...
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Page 18: Location Of Outdoor Terminations
Figure 16 illustrates vent and combustion air pipe sizes exiting the furnace. Transition to the correct pipe size must be done close to the furnace so that the full length of pipe is of proper size. Straight neoprene couplings are supplied with the downflow furnaces only. -
Page 19: Horizontal Venting
This may result in fur- nace vibration. In severe cases, the furnace will cycle due to the intermit- tent contact between the flame and the flame sensor. If you note oscillations occurring, check the vent configura- tion. -
Page 20: Vertical Venting
Figures 19 and 20. Note that a combustion air intake must be provided with an elbow opening downward. The screen provided with the furnace must be installed in the elbow to prevent entry of debris or creatures. -
Page 21: Drainage Of Condensate From Furnace
DRAINAGE OF CONDENSATE FROM FURNACE The condensate drainage system is internal to the furnace. The drain may exit either the right or left side of the furnace cabinet. For a right side drain simply extend the tubing out of the 7/8"... -
Page 22: Gas Supply And Piping
(usually contains lime- stone). Proper drains and connections to the condensate tubing are required as NORDYNE cannot be held responsible for water leakage which occurs due to loose hose connections or improperly sealed drain line pipes. -
Page 23: Conversion
The cubic feet per hour listed in the table above must be greater than the cubic feet per hour of gas flow required by the furnace. To determine the cubic feet per hour of gas flow required by the furnace, divide the input rate of the furnace by the heating value of the gas: Cubic Feet Per Hour Required Table 6. -
Page 24: Electrical Wiring
Refer to the furnace nameplate and Table 11 for electrical requirements. Line Voltage Wiring The line voltage (115 volt) to the furnace must be supplied from a dedicated branch circuit con- taining the correct fuse or circuit breaker for the furnace. -
Page 25: Low Voltage Wiring
Table 9. Natural and LP Gas Orifice Sizes for Elevations between zero and 4999 ft. Above Sea Level used in this furnace require an earth ground to operate properly. Acceptable methods for grounding are electrical wire or conduit ap- proved for electrical ground service. Do not use gas piping as an electrical ground. -
Page 26: Start-Up Procedure
The firing rate must be verified for each installa- tion to prevent over-firing the furnace. NOTE: The firing rate must not exceed the rate shown on the furnace rating plate. At altitudes above 2000 ft. the firing rate must be adjusted as described in the high altitude section. -
Page 27: Verifying And Adjusting Temperature Rise
Use the following procedure to determine the firing rate: Shut off all other gas fired appliances. Start the furnace and allow it to run for at least three minutes. Measure the time (in seconds) required for the gas meter to complete one revolution. - Page 28 CUBIC FEET PER REVOLUTION OF TIME FOR ONE REVOLUTION (SECONDS) GAS FLOW RATE (CU UBIC FEET PER HOUR) TIME FOR METER ONE REVOLUTION (SECONDS) 1500 1385 1286 1200 1125 1059 1000 CUBIC FEET PER REVOLUTION OF METER...
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Page 29: Verifying Operation Of The Supply Air Limit Switch
To verify operation of the supply air switch, make sure that the blower door is in place and that there is power to the furnace. Completely block the return airflow to the fur- nace by installing a close-off plate in place of or upstream of the filter(s). -
Page 30: G6Rc, G6Rd And G6Rl Control Board Diagram
2 FLASHES 3 FLASHES 4 FLASHES If any of the original wire as supplied with 5 FLASHES the furnace must be replaced, it must be Continuous replaced with wiring material having a temperature rating of at least 105 C. FLAME... -
Page 31: Maintenance
MAINTENANCE It is recommended that the furnace be checked yearly. At a minimum, this check should include the following items. WARNING: To avoid electric shock, personal in- jury, or death, disconnect the electric power before performing any mainte- nance. WARNING:... -
Page 32: Location Of Major Components
15 In-Line Drain Assembly 16 Burner View Port 17 Front Header Box 18 Combustion Air Intake 19 Exhaust Vent G6RL Downflow Furnace 1 Ignitor (Not Shown) 2 Flame Sensor (Not Shown) 3 Gas Valve 4 Flame Roll-out Switch(s) 5 Pressure Switch... -
Page 33: Sequence Of Operation
• Change or replace the air filters monthly during any period when the circulating blower is operating regularly. • Always replace the doors on the furnace after servicing. Do not operate the furnace without all doors and covers in place. -
Page 34: Furnace Fails To Operate
AUTO, the circulating blower will operate for a specified delay (factory set at 120 seconds). Furnace Fails to Operate If the furnace does not operate check the follow- ing: Is the thermostat operating properly? Are the blower compartment door(s) in... -
Page 35: Installation/Performance Checklist
FUEL TYPE: Natural Gas _______ LP/Propane ________ Gas Piping Connections leak-tested? ______ Gas Line Pressure: ____________________ (in. water column, with furnace operating) Manifold Pressure: ____________________ (in. water column, with furnace operating) Is there adequate fresh air supply for combustion and ventilation? _____________ Furnace Input: __________________ Supply Air Temperature: ____________ (°... - Page 36 707931 7079310 (Replaces 7078950) Specifications and illustrations subject to change without notice and without incurring obligations. St. Louis, MO Printed in U.S.A. (9/99)
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Questions and answers
My furnace FG6RC 100c - 16B failed to ignite. The control board had one red light flash per time unit. I found the vent safety switch open and pushed the reset button. Now my furnace functions properly. Do I need to do anything else? Why did the vent safety switch trip open?
The vent safety switch on a Nordyne G6RC 90+ furnace trips open if the outlet flue gas temperature exceeds 160°F. This protects the plastic flue system and the inducer from over-temperature conditions.
This answer is automatically generated