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13

Total Input

Rating (Btuh)

  40,000
  60,000
  80,000
100,000
120,000
140,000
160,000

Minimum

Free Area

(Each Opening)

20 sq. in.
30 sq. in.
40 sq. in.
50 sq. in.
60 sq. in.
70 sq. in.
80 sq. in.

Round Duct

Diameter

  5"
  6"
  7"
  8"
  9"
10"
10"

Furnace

Water Heater

Air Duct
must be 
at least 
1 sq. in.
per 2000 
Btuh of 
total input
rating.

Vent or

Chimney

Air Duct

Air Duct

Figure 13.  Equipment in a Confined Space

with all Combustion Air Drawn from the

Outside through Horizontal Ducts

Air Requirements For One-Pipe
Installation

When air for combustion is to be taken from
around the furnace, a protective screen must be
installed over the combustion air intake open-
ing.  This screen is provided with the furnace
installation instructions and functions to prevent
debris from entering the combustion system.  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.  See Figure 8.

Installation In An Unconfined Space

!

 CAUTION:

"Tight" buildings (with weather strip-
ping and caulk to reduce infiltration),
may require special provisions for in-
troduction of  outside air to ensure
satisfactory combustion and venting,
even though the furnace is located in
an unconfined space.

An unconfined space is an area including all
rooms not separated by doors with a volume
greater than 50 cubic feet per 1,000 Btuh of the
combined input rates of all appliances which draw
combustion air from that space.  For example, a
space including a water heater rated at 45,000
Btuh and a furnace rated at 75,000 Btuh requires
a volume of 6,000 cubic feet [50 x (45 + 75) =
6,000] to be considered unconfined.  If the space
has an 8 foot ceiling, the floor area of the space
must be 750 square feet      (6,000 / 8 = 750).  In
general, a furnace installed in an unconfined
space will not require outside air for combustion.

!

 WARNING:

Furnaces installed with combustion
air drawn from a heated space which
includes exhaust fans, fireplaces, or
other devices that may produce a
negative pressure should be consid-
ered confined space installations.

Installation In A Confined Space

A confined space is one which does not meet the
unconfined space volume requirements, and
typically involves installation  in a small room.  All
such installations must have specific provisions
for introduction of combustion and ventilation
air.  

Codes require that two openings be pro-

vided for this - one with bottom edge within 12"
of the floor and one with top edge within 12" of
the ceiling.  The size and other criteria for these
openings must be per the following sections.

Combustion air openings must not be restricted
in any manner.

Furnaces installed in a confined space which
supply circulating air to areas outside of the
space must draw return air from outside the
space and must have return air ducts tightly
sealed to the furnace.

Air From Inside
Air for combustion and ventilation may be taken
from inside the building through an interior wall
if the building is not "tight"  and if the total volume
of the furnace space and the space from which
air is drawn meets the volume requirements for
an unconfined space.  In such cases, the two
openings in the wall must each have free area of
at least one square inch per 1000 Btuh of 

total

appliance input, but not less than 100 square

Summary of Contents for G6RC 90+

Page 1: ...ndensing Furnace Residential Gas Furnaces WARNING Improper installation adjustment al teration service or maintenance can cause injury or property damage Re fer to this manual for assistance For addit...

Page 2: ......

Page 3: ...ical 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 Natu...

Page 4: ...ndensate Drain Outlets A B Combustion Air Vent See Fig 15 for sizes 1 1 2 x 3 1 2 Dia Opening for Gas Connection 3 4 3 4 3 4 22 1 2 Exhaust Vent Combustion Air Inlet 1 1 2 x 3 1 2 Dia Opening for Gas...

Page 5: ...2 Knockout For Gas Connection Bottom Opening 27 7 8 19 3 4 7 8 Dia Electric Connection 24 1 2 3 4 43 21 7 8 21 1 2 15 1 2 21 1 2 10 1 4 Bottom Supply Air Opening Side Exhaust Vent 2 1 1 2 x 3 1 2 Dia...

Page 6: ...1250 69 1150 75 1440 60 1410 61 1370 63 1320 66 1270 68 1210 72 1140 1060 1230 1210 1180 1140 1090 1030 960 880 1860 56 1800 58 1730 60 1650 63 1570 66 1480 70 1380 75 1270 82 1650 63 1610 65 1550 67...

Page 7: ...71 1460 72 1410 75 1370 77 1450 73 1430 74 1400 75 1360 78 1340 79 1300 81 1270 83 1230 1280 1210 1180 1140 1090 1070 1030 990 1140 1090 1060 1030 980 35 950 36 910 37 870 39 875 39 835 41 820 41 805...

Page 8: ...National Fuel Gas Code is available from American National Standards Institute Inc 1430 Broadway New York New York 10018 Canada installations shall comply with CAN CGA B149 installation codes local pl...

Page 9: ...ases are factory supplied accessories part numbers 902677 and 902974 When the furnace is in stalled on a factory or site built cased air condi tioning coil the sub base is not necessary However the pl...

Page 10: ...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 If a combination of indoor and outdoo...

Page 11: ...refer to the former as direct vent or two pipe installation Installation with air taken from around the furnace is sometimes referred to as one pipe installation i e only the vent exhaust pipe is prov...

Page 12: ...in 30 sq in 35 sq in 40 sq in Round Duct Diameter 4 5 5 6 6 7 8 Furnace Water Heater Vent or Chimney Figure 10 Equipment in a Confined Space with all Combustion Air drawn from Outdoors through Exterio...

Page 13: ...heater rated at 45 000 Btuh and a furnace rated at 75 000 Btuh requires a volume of 6 000 cubic feet 50 x 45 75 6 000 to be considered unconfined If the space has an 8 foot ceiling the floor area of t...

Page 14: ...ion and provide air for combustion and ventilation per the previous section The capac ity table provided in this section applies to the total of vent and combustion air piping for either type of insta...

Page 15: ...exhaust in the same atmospheric pressure zone i e both must exit the building though the same portion of exterior wall or roof Vent piping must be sloped upwards not less than 1 4 per foot in the dire...

Page 16: ...ose Clamps Optional Not Shown 5 8 Inlet Exhaust Combustion Air Inlet Offset with Exhaust Pipe for Adequate Dimensional Clearance PVC or ABS Pipe See Vent Table 4 Straps or Other Suitable Supports at M...

Page 17: ...e Front Straight Neoprene Couplings with 2 Hose Clamps Optional Not Shown Combustion Air Inlet 2 PVC on G6RL 040 060 models 3 PVC on G6RL 080 100 models 2 PVC Exhaust Vent All Models Furnace Top Combu...

Page 18: ...of the hose clamps Then slide the other end of the rubber coupling onto the other pipe from the vent and securethecouplingwiththesecondhoseclamp Ensure that the connection is tight and leak free NORDY...

Page 19: ...between the flame and the flame sensor If you note oscillations occurring check the vent configura tion Make sure that the exhaust vent does not have a 90 degree termination Figure 18 Alternate Horizo...

Page 20: ...Figure 20 are maintained d No other gas fired appliances are vented through the chimney Vent Freezing Protection When the vent pipe is exposed to temperatures below freezing i e when it passes through...

Page 21: ...ghten for Step 3 Route to floor drain OR Route to condensate pump Keep downward slope Collector Box A Rotate counter clockwise Step 2 8 Left Side Drain HARD J Drain Tube Clamp Loosen For Step 1 Retigh...

Page 22: ...installed in compliance with local codes and utility regulations Some local regulations require the installation of a manual main shut off valve and ground joint union external to the furnace The shu...

Page 23: ...personal injury or death Conversion Conversion of this furnace to use LP propane gas must be made by qualified service personnel using only approved parts High Altitude Application High altitude appl...

Page 24: ...imum temperature rating of 105 C 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...

Page 25: ...cted Adverse affects include radiant loading from fireplaces sunlight or lighting fixtures and convective loading from warm air registers or electrical appliances To check the heat anticipator setting...

Page 26: ...ter the furnace has run for approximately five minutes set the thermostat below room temperature and verify steps 9 through 11 of the SEQUENCE OF OPERATION Verifying and Adjusting Firing Rate The firi...

Page 27: ...l clear window on the burner box The burner flame should carry over between all burners The flames should be blue without yellow tips Flames should extend from each burner without lifting curling or f...

Page 28: ...1 643 58 62 310 621 60 60 300 600 62 58 290 581 64 56 281 563 GAS FLOW RATE CU CUBIC FEET PER REVOLUTION OF METER TIME FOR ONE REVOLUTION SECONDS 1 5 10 80 45 225 450 82 44 220 439 84 43 214 429 86 42...

Page 29: ...7 8 9 4 5 6 1 2 3 EAC HUM M1 M2 M3 COOL HEAT L1 XFMR Unused Motor Leads EAC Electronic Air Tap 5A 120 VAC Status Light Red Heating Speed Tap Cooling Speed Tap Humidifier Tap 5A 120 VAC Connect Neutra...

Page 30: ...E FLAME ROLL OUT SWITCH ALL MODELS VENT PRESSURE SWITCH 93 MODELS ONLY PRESSURE SWITCH R Y G W C Y 180 120 90 60 THESE WIRES ARE NOT PRESENT ON 3 SPEED MODELS BLOWER DECK SWITCH SELECT MODELS ONLY Leg...

Page 31: ...ned monthly during the heating season New or newly renovated homes may require more frequent changing until the construction dust has been removed Lubrication The bearings in the circulating air blowe...

Page 32: ...on Air Intake 19 Exhaust Vent G6RC G6RD Upflow Furnaces 1 Ignitor Not Shown 2 Flame Sensor Not Shown 3 Gas Valve 4 Flame Roll out Switch s 5 Pressure Switch 6 Vent Pressure Switch G6RD Only Not Shown...

Page 33: ...of ignitor warm up the gas valve 24 VAC will open The ignitor circuit stays energized for 6 seconds after the gas valve opens 7 The furnace control must prove flame via the flame sensor six seconds af...

Page 34: ...r ignition it will try again every hour if a call for heat remains If the inducer and circulating air blowers are operating and items 1 through 8 have been checked press the red reset button on the ve...

Page 35: ...e operating Manifold Pressure ____________________ in water column with furnace operating Is there adequate fresh air supply for combustion and ventilation _____________ Furnace Input ________________...

Page 36: ...St Louis MO 7079310 Replaces 7078950 Specifications and illustrations subject to change without notice and without incurring obligations Printed in U S A 9 99 707931 707931...

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