York G8C, GF8 User Manual
USER’S INFORMATION,
MAINTENANCE AND
EFFICIENCY
RATING
CERTIFIED
SERVICE MANUAL
MODELS: G8C/ GF8
(Single Stage Multi-Position)
CONTACT INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
TABLE OF CONTENTS
USER’S INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
DESCRIPTION (50-125 MBH INPUT MODELS) . . . . . . . . . . . . . . .2
DESCRIPTION (150 MBH INPUT MODELS) . . . . . . . . . . . . . . . . . . 2
INSTRUCTIONS FOR EXAMINING THE FURNACE
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
HOW YOUR GAS FURNACE WORKS . . . . . . . . . . . . . . . . . . . . . . 4
START-UP AND SHUTDOWN INSTRUCTIONS . . . . . . . . . . . . . . .4
Read the Instructions Below Before Trying to Start the Furnace . . 4
Operating Instructions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
To Turn Off the Appliance: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FURNACE USER MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . .4
Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Removing Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Blower Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Motor Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
SERVICE AND MAINTENANCE MANUAL . . . . . . . . . . . . . . . . . . . . 6
CONTACT INFORMATION
• Go to website at www.york.com click on “contact”, then click on “contact form” and follow the instructions.
• Contact us by mail:
York International
Consumer Relations
Norman, OK 73069
SAFETY SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
FURNACE MAINTENANCE SECTION . . . . . . . . . . . . . . . . . . . . . . .6
FURNACE CLEANING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Burner Removal/Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Cleaning the Heat Exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Continuous Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Intermittent Blower - Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Heating Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Hot Surface Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
FURNACE CONTROL DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . .8
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
FIELD INSTALLED ACCESSORIES - NON-ELECTRICAL . . . . . .11
REPLACEMENT PART CONTACT INFORMATION . . . . . . . . . . . . .11
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
5005 York Drive
This product was manufactured
in a plant whose quality system
is certified/registered as being
in conformity with ISO 9001.
The manufacturer recommends that the user read all sections of this manual and keep the manual for future reference.
FIRE OR EXPLOSION HAZARD - Failure to follow safety
warnings exactly could result in serious injury, death, or property damage.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
— 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
(including cell phone) in your building.
• Leave the building immedia te l y.
• 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.
— Installation and service must be performed by a quali-
fied installer, service agency or the gas supplier.
SECTION I: USER’S INFORMATION
SAFETY
1. The furnace area must be kept clear and free of combustible materials, gasoline and other flammable vapors and liquids.
2. Insulating materials may be combustible. The furnace must be
kept free and clear of insulating materials. The furnace area must
be examined when installed in an attic or other insulated space or
when insulation is added to be sure that the insulation material has
been kept away from the furnace.
3. The furnace needs air for combustion in order to operate properly
and safely. Do not block or obstruct air openings on the furnace,
air openings to the area where the furnace is installed, or spaces
around the furnace.
4. Follow the instructions exactly as shown on the OPERATING
INSTRUCTION LABEL or the Start-up and Shutdown Instructions
on Page 4 of this manual when lighting the furnace or turning the
furnace off.
5. Should the gas supply fail to shut off or if overheating occurs, shut
off the gas valve to the furnace before shutting off the electrical
supply.
6. Do not use this furnace if any part has been under water. A flooddamaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. A qualified service agency
should be contacted to inspect the furnace and replace all gas
controls, control system parts, electrical parts that have been wet
or the furnace if deemed necessary.
035-19992-001 Rev. A (0404)
035-19992-001 Rev. A (0404)
7. NEVER…Store flammable materials of any kind near your fur-
nace. Gasoline, solvents, and other volatile liquids should be
stored only in approved containers outside your home. These
materials vaporize easily and are extremely dangerous.
8. NEVER
…Store cleaning materials near your furnace. Materials
such as bleaches, detergents, powdered cleansers, etc., can
cause corrosion of the heat exchangers.
9. NEVER
…Use the area around your furnace as a storage area for
items which could block the normal flow of air. This flow of air is
required for ventilation of the various furnace components.
FIRE OR EXPLOSION HAZARD
This furnace is designed and approved for use with Nat-
ural Gas and (LP) Propane Gas ONLY. DO NOT BURN
ANY LIQUID FUEL OR SOLID FUEL IN THIS FURNACE.
Burning any unapproved fuel will result in damage to the
furnace heat exchanger, which could result in Fire, Personal Injury, and/or Property Damage.
DESCRIPTION (50-125 MBH INPUT MODELS)
This furnace can be installed in the upflow, downflow, or horizontal left
or right position. Figure 2 shows a typical model in the downflow position and Figure 1 shows a typical model in the upflow position. The furnace may also lie on either side in a horizontal position. The furnace is
equipped with an induced-draft vent blower and atmospheric burners.
Combustion air is taken from the space or area in which the furnace is
installed and drawn into the burners through the louvers in the front
panel. Flue gas is drawn from the heat exchanger by the vent blower
and discharged through the flue pipe to the outside atmosphere.
This is a forced air furnace. The furnace circulating air blower draws
cool air from the house, passes it over the hot furnace heat exchanger
and circulates the warmed air through the ductwork to the house.
The furnace is equipped with the controls necessary for proper operation. The various components referred to in this manual and on the furnace nameplate are identified in Figures 1, 2 & 3.
FURNACE
CONTROL
BLOWER
DOOR
SWITCH
ROLL-OUT
SWITCHES
BURNERS
HOT
SURFACE
IGNITOR
GAS
VALV E
PRESSURE
SWITCH
VENT
VENT PIPE
TRANSITION
3” DIAMETER
VENT PIPE
ROLL-OUT
SWITCH
VENT
BLOWER
FIGURE 2: Component Locations - Downflow (50 - 125 MBH Models)
DESCRIPTION (150 MBH INPUT MODELS)
This furnace can be installed in the upflow or horizontal left or right position. Figure 3 shows the 150 MBH input model. The furnace may also
lie on either side in a horizontal position. This furnace is not approved to
be installed in a downflow application. The furnace is equipped with an
induced-draft vent blower and atmospheric burners. Combustion air is
taken from the space or area in which the furnace is installed and drawn
into the burners through the louvers in the front panel. Flue gas is drawn
from the heat exchanger by the vent blower and discharged through the
flue pipe to the outside atmosphere.
This is a forced air furnace. The furnace circulating air blower draws
cool air from the house, passes it over the hot furnace heat exchanger
and circulates the warmed air through the ductwork to the house.
The furnace is equipped with the controls necessary for proper operation. The various components referred to in this manual and on the furnace nameplate are identified in Figure 3.
PRESSURE
SWITCH
GAS
VALV E
HOT
SURFACE
IGNITOR
BURNERS
BLOWER
DOOR
SWITCH
FURNACE
CONTROL
VENT
BLOWER
DIRT
LEG
ROLL-OUT
SWITCH
PRESSURE
SWITCH
GAS
VALV E
HOT
SURFACE
IGNITOR
BURNERS
ROLL-OUT
SWITCHES
BLOWER
DOOR
SWITCH
FURNACE
CONTROL
VENT
BLOWER
ROLL-OUT
SWITCH
ROLL-OUT
SWITCHES
FIGURE 3: Component Locations - Upflow (150 MBH Models)
FIGURE 1: Component Locations - Upflow (50 - 125 MBH Models)
2 Unitary Products Group
035-19992-001 Rev. A (0404)
INSTRUCTIONS FOR EXAMINING THE FURNACE
INSTALLATION
It is the owner’s responsibility to ensure that an annual inspection of the
entire heating portion of the unit is made by a qualified service agency.
Examine the furnace as outlined below in steps “1 - 6” before each
heating season. Use Figures 5 & 6 for visual reference.
1. Examine the heat exchanger, vent/combustion air piping, vent
connectors and chimney to be sure they are clear and free of
obstructions.
2. Examine the vent pipe making sure it is firmly in place, that it
slopes slightly upward and is physically sound without holes and
all of the connections are secure.
3. Examine the return-air duct connections to make sure they are
physically sound, sealed to the furnace casing, and the ducts terminate outside the space containing the furnace.
4. Examine the furnace casing making sure the physical support is
sound without sagging, cracks or gaps. Examine the furnace base
making sure it is physically sound without cracks, gaps or sagging
and has a good seal.
EXAMINE ENTIRE
5
FURNACE CASING
SHOWN IN ALL
DRAWINGS
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
4
EXAMINE
FURNACE
CASING
EXAMINE EXTERNAL
VENT PIPE
5. Examine the furnace casing for obvious signs of deterioration.
6. Examine the burner flames to make sure they are in good adjustment. Refer to the pictorial sketch shown in Figure 4 as a comparison to the actual flame.
BLUE CONE PORTION OF FLAME SHOULD
ENTER HEAT EXCHANGER TUBE
FIGURE 4: Burner Flame Drawing
1
EXTERNAL HEAT EXCHANGER INTERNAL
VENT COMBUSTION AIR PIPE. MUST
REMOVE PANEL TO EXAMINE.
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
4
EXAMINE
FURNACE
CASING
3
EXAMINE
RETURN AIR
DUCT
CONNECTION
FIGURE 5: Furnace Examination Checkpoints - Upflow
3
EXAMINE RETURN
AIR DUCT
CONNECTION
4
EXAMINE
FURNACE
CASING
EXAMINE
EXTERNAL
VENT PIPE
5
EXAMINE ENTIRE
FURNACE CASING
SHOWN IN ALL
DRAWINGS
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
FIGURE 6: Furnace Examination Checkpoints - Downflow
3
EXAMINE
RETURN AIR
DUCT
CONNECTION
1
EXTERNAL HEAT EXCHANGER INTERNAL
VENT COMBUSTION AIR PIPE. MUST
REMOVE PANEL TO EXAMINE.
6
REMOVE
PANEL
TO EXAMINE
BURNER
FLAMES
3
EXAMINE RETURN
AIR DUCT
CONNECTION
4
EXAMINE
FURNACE
CASING
Unitary Products Group 3
035-19992-001 Rev. A (0404)
HOW YOUR GAS FURNACE WORKS
Your furnace is a very easy appliance to take for granted. Season after
season, it sits there in your home, keeping you warm and comfortable.
For this reason, you may never have given much thought to the way
your furnace operates. In order to get the safest and most efficient operation from your furnace, you should understand how your furnace does
its job.
When you set your thermostat to provide more heat in your home, you
are starting the heating cycle of the furnace. First, the inducer motor
starts to purge the heat exchanger of any remaining gases. Next, the
hot surface ignitor glows and after a warm-up period the gas valve
opens and ignition occurs. A short time later, the blower starts and distributes the warm air throughout the home. When the temperature setting on your thermostat is reached, the gas valve closes, the main
burners are turned off, and the blower continues to run until the remaining warm air in the system is distributed. When the blower stops, the
heating cycle has ended.
START-UP AND SHUTDOWN INSTRUCTIONS
Read the Instructions Below Before Trying to Start the
Furnace
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury, and/or loss of life.
A. This appliance does not have a pilot. It is equipped with an ignition
device which automatically lights the burner. Do not try to light the
burner by hand.
B. BEFORE OPERATING; smell all around the appliance area for
gas. Be sure to smell next to the floor because some gas is
heavier than air and will settle on the floor.
C. Use only your hand to push the gas control switch to the “on” posi-
tion. Never use tools. If the switch will not operate by hand, don’t
try to repair it, call a qualified service technician. Force or
attempted repair may result in a fire or explosion.
D. Do not use this appliance if any part has been under water. Imme-
diately call a qualified service technician to inspect the appliance
and to replace any part of the control system and any gas control,
which has been under water.
Operating Instructions:
1. STOP! Read the safety information above.
2. Set the thermostat to the lowest setting.
3. Turn off all electric power to the appliance.
4. Remove burner door.
5. Move gas control switch to the “OFF” position. Do not force.
6. Wait five (5) minutes to clear out any gas. If you then smell gas,
STOP! Follow “B” in the safety information above. If you don’t
smell gas, go to next step.
7. Move gas control switch to the “ON” position. Do not force.
8. Replace burner door.
9. Turn on all electric power to the appliance.
10. Set thermostat to the desired setting. Burner will light, which may
take 30-60 seconds.
11. After three (3) trials for ignition, if the appliance will not operate follow the instructions, “TO TURN OFF THE APPLIANCE” and call
your service technician or gas supplier.
To Turn Off the Appliance:
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Remove burner access panel.
4. Move gas control switch to the “OFF” position.
5. Replace burner access panel.
Should overheating occur, or the gas valve fail to shut off,
turn the external manual gas valve in the gas supply line to
the furnace to the “off” position and let the furnace cool off
before shutting off the electrical power supply. Refer to
Figure 8.
OUTLET
PRESSURE
PORT
INLET
WRENCH
BOSS
INLET
PRESSURE
PORT
OFF
ON
ON/OFF SWITCH
(Shown in ON position)
VENT PORT
OUTLET
MAIN REGULATOR
ADJUSTMENT
FIGURE 7: Gas Valve - White Rodgers
EXTERNAL MANUAL
SHUTOFF VALVE
TO GAS
SUPPLY
DRIP
LEG
TO GAS
SUPPLY
GROUNDED JOINT UNION
MAY BE INSTALLED
INSIDE OR OUTSIDE UNIT.
FIGURE 8: Gas Piping
NOTE: The spring-loaded safety cut-off switch, mounted under the
blower deck will automatically cut off the electrical power supply
to the furnace when the blower panel is removed. As a safety
precaution, all electrical power and the gas supply to the furnace
should be turned off before servicing.
FURNACE USER MAINTENANCE
Before proceeding, be sure the area is well ventilated. Turn
the thermostat OFF. If the blower is running, wait until it
stops automatically. Turn OFF the gas and electrical power
supplies to the furnace. Check all metal parts and surfaces
to be sure they have cooled to room temperature before
you begin.
Every time the filters are changed the following items should be visually
inspected:
• Check combustion air and vent pipe for blockage or leakage.
• Check all components to be sure they are in good condition and
that there are no obvious signs of deterioration.
• Check the drain lines to make sure there are no cracks or leaks.
• Check for dirt or lint on any surfaces or on components. Do not try
to clean any of the surfaces or components. Cleaning of the furnace and its components must be done by a qualified service professional.
4 Unitary Products Group
035-19992-001 Rev. A (0404)
If, during the inspection of your furnace, you find any of the following
conditions:
• Excessive amounts of dust and lint on components.
• Damaged or deteriorated components or surfaces.
• Leaks or blockage in the vent pipe passages.
• Water on any surface inside or outside of the furnace.
Do not operate the furnace, call a certified dealer / servicing contractor
to check and / or clean your furnace, or for more information if you have
questions about the operation of your furnace.
If all components appear to be in good operating condition, replace the
front panels. Turn ON the gas and electrical power supplies to the furnace, and set thermostat to the desired temperature.
Air Filters
Dirty filters greatly restrict the flow of air and may cause damage to the
moving parts of the furnace. If the filters become clogged the heat
exchangers and blower motor could overheat resulting in a potentially
dangerous situation.
The filters should be checked every 3 months. On new construction,
check the filters every week for the first four weeks and every three
weeks after that, especially if the indoor fan is running continuously.
When replacing the filter(s) you must use filters that are the same size
as those recommended in Table 1. Use the following procedure to
determine the filter size. Never operate your furnace without a suitable
air filter.
1. Measure the furnace width. Use the following measurements to
determine the cabinet size.
• A 17-1/2” wide cabinet is a “B” cabinet.
• A 21” wide cabinet is a “C” cabinet.
• A 24-1/2” wide cabinet is a “D” cabinet.
2. Locate the cabinet size on Table 1, then determine whether you
have a bottom, side or top return using the following method.
a. If the return air filters are on the left or right side of the fur-
nace it is a side return. Refer to Figure 11.
b. If the air filter is on the bottom of the furnace then you have a
bottom return. Refer to Figure 12 or for horizontal applications refer to Figure 9.
c. If the air filters are on the bottom an d the side of the furnace
then you have a bottom and side return. You must replace
both air filters. Brackets with the number two (2) before the filter size requires 2 filters. Refer to Figures 11 & 12.
d. If the air filters are on both sides of the furnace then you have
a (2) sided return. You must replace both air filters.
e. If the air filters are in the return air plenum, above the furnace
then you have a top return (Downflow Furnace). Refer to Figure 10.
3. After you determine the cabinet size and what return configuration
you have, look up the recommended filter size from Table 1. You
must replace the air filters with the same size as recommended.
Removing Filters
Externally Mounted Air Filters
The air filter is in a rack that is attached to the casing of the furnace or
placed in the return air duct. Figures 9, 10, 11 & 12 indicate possible
external air filter box locations.
AIR FILTER RACK
ACCESS DOOR
FILTER
FURNACE
RACK
18”
MIN
AIR FLOW
FIGURE 9: External Air Filter Rack - Horizontal Left Position
AIR FLOW
DUCTWORK
NOTE: FILTER ACCESS THROUGH
DUCTWORK MUST BE PROVIDED
FOR REMOVAL AND CLEANING
FILTER RACK
(factory supplied with some furnaces)
RACK AND FILTERS SECURED
INSIDE BLOWER SECTION
FOR SHIPMENT
CASING SIZE
16-1/4”
22-1/4”
26-1/4”
FILTERS
FILTER
RACK
CROSS SECTION A-A
(with Plenum and filters)
DIMENSION FH
12-3/4”
11”
8-1/4”
BRANCH
DUCTS
FH
FIGURE 10: Downflow Filter
AIR FILTER
RACK
ACCESS
DOOR
DUCT
RIGHT SIDE
FILTER RACK
AIR FLOW
AIR FLOW
AIR FILTER
RACK
ACCESS
DOOR
DUCT
LEFT SIDE
FILTER RACK
FURNACE
FIGURE 11: External Air Filter Rack - Left & Right Side Position
FURNACE
AIR FILTER RACK
ACCESS DOOR
AIR FLOW
BOTTOM FILTER RACK
DUCT
FIGURE 12: External Air Filter Rack - Bottom Position
Unitary Products Group 5
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