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TROUBLESHOOTING

If the furnace fails to operate check the following:

• Is the thermostat operating properly?

• Are the blower compartment door(s) in place?

• Is the furnace disconnect closed?

• Has the circuit breaker tripped or the control board fuse

burned open?

• Is the gas turned on?

• Are any manual reset switches open?

• Is the filter dirty or plugged?

• Is the flame sensor coated? (Remove and clean with

steel wool.

(Do not use emery cloth or sandpaper!)

• Is there blockage in the condensate drain switch? Also

verify that there is no double trapping of condensate.

• Is the secondary heat exchanger free of debris and

clogs?

• Is evaporator coil clean and free of debris (If applicable).

• Are all the LED’s on the furnace control board constantly

ON? If not, refer to

Table 13

or the wiring diagram,

Figure

34 (page 32)

Figure 36 (page 34)

to determine fault

condition.

• Are all the LED’s on the motor control board constantly

ON? If not, refer to

Table 15

to determine fault condition.

IMPORTANT NOTE:

The furnace will lock out after 5 failed attempts for ignition

and will try again every hour if the call for heat remains.

• If the Inducer Blower is operating, and items above have

been verified, check the Blower Limit Switch and reset if

necessary. See

Figure 47 (page 51)

Figure 48 (page

52)

for component location.

• If the furnace operates when the Blower Limit Switch is

reset, contact a qualified service technician to identify

and repair the problem.

• If the furnace still doesn’t operate, check the Flame Roll-

out Switches and reset if necessary.

• If the furnace operates when the Flame Rollout Switch

is reset, contact a qualified service technician to identify

and repair the problem.

DIAGNOSTIC DESCRIPTION

GREEN LED

RED LED

Control Fault (No Power)

Off

L1/Neutral Polarity Fault

Flash

1 Hour Lockout

Alternating Flash

Normal Operation

Pressure Switch Closed Fault

Flash

Pressure Switch Open Fault

Flash

Open Limit Switch Fault

Flash

Off

DIAGNOSTIC DESCRIPTION

YELLOW LED

Low Flame Sensor Signal

Continuous Flash

Flame Present

Table 13. Nordyne/UTEC Control Board Fault

Conditions

DIAGNOSTIC DESCRIPTION

RED LED

GREEN LED

Control Fault (No Power)

Off

Normal Operation

Motor Fault

Flash

Twin Fault (No Motor Fault)

Flash

Communications Fault

Flash

Table 15. Motor Control Board Fault Conditions

RED LED

FLASH

ERROR/CONDITION

System Lockout (Retries Exceeded)

Pressure Switch Stuck Closed

Pressure Switch Stuck Open

Open High Temperature Limit Switch

Flame Sensed > 4.25 Seconds with Gas Valve

De-Energized

Open Flame RO Switch

Igniter Relay Fault

Open Fuse

Igniter Open

Inducer Relay Error

Flash codes NOT stored in memory

Low Flame Sense Signal

Twinning Fault

Off

Control Failure / No Power / Internal Fault / IRQ Loss
Gas Heating Lockout (Gas valve energized when it

should be de-energized)
Or Gas Valve De-energized when it should be

Energized

Rapid Flash Reverse Polarity

Continuous

Normal Operation

Table 14. Emerson Control Board Fault Conditions

Содержание FG7SC

Страница 1: ...rformed by a qualified installer service agency or the gas supplier 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...

Страница 2: ...Connections 25 Twinning 25 One stage heating 26 Two stage heating 26 Heat Anticipator 26 START UP ADJUSTMENTS 27 Pre Start Check List 27 Start up Procedures 27 Verifying Adjusting Input Rate 27 Verify...

Страница 3: ...ne cigarette lighter fluid dry cleaning fluids paint thinners or other volatile fluids The installer should become familiar with the units wiring diagram before making any electrical connections to th...

Страница 4: ...ationinstructionsshallremainwiththeappliance or equipment at the completion of the installation The information listed below is for reference purposes only and does not necessarily have jurisdiction o...

Страница 5: ...bovetherequirements Allow24inchesminimum clearance from the front of the unit However 36 inches is strongly recommended See Figure 1 for minimum clearance requirements Operation of Furnace During Cons...

Страница 6: ...ntingsystemforpropersizeand horizontalpitch asrequiredintheNationalFuel Gas Code ANSI Z223 1 NFPA 54 or the CSA B149 1 Natural Gas and Propane Installation Codes and these instructions Determine that...

Страница 7: ...Exhaust fans clothes dryers fireplaces and other appliances that force air from the house to the outdoors can create a negative pressure inside the house resulting in improper furnace operationorunsa...

Страница 8: ...uvers For Unheated Crawl Space Inlet Air Ventilation Louvers each end of attic NOTE Air openings shall each have a free area of not less than one square inch per 4 000 Btuh of the total input rating o...

Страница 9: ...greater than 50 cubic feet per 1 000 Btuh of the combined input rates of all appliances which draw combustion air from that space In general a furnace installed in an unconfined space will not require...

Страница 10: ...rimers must be certified as a system to ULC S636 However this requirement does not apply to the finish flanges or piping internal to the furnace Vent Pipe Length Diameter In order for the furnace to o...

Страница 11: ...ace operation and conformance to applicable codes A vent terminal must be located at least 3 feet above any forced air inlet located within 10 feet This does not apply to the combustion air inlet of a...

Страница 12: ...must be positioned pointing away from the exhaust vent 8 Min 36 Max Plumbing Vent Roof Boot Both Pipes WINTER DESIGN TEMPERATURE MAXIMUM FLUE PIPE LENGTH FEET IN UNCONDITIONED EXTERIOR SPACES WITHOUT...

Страница 13: ...ses the furnace blower to provide airflow over the indoor coil the coil must be installed downstream on the outlet side of the furnace or in parallel with the furnace If a cooling system is installed...

Страница 14: ...ns including installation in the upflow or horizontal positions with either right left or upflow return air SL SM series gas furnaces may only be installed as a downflow application General Requiremen...

Страница 15: ...NING Failure to install the downflow sub base kit may resultinfire propertydamageorpersonalinjury To install an SL SM series gas furnace on combustible flooring a special sub base is required Downflow...

Страница 16: ...nducer assembly 2 Removetheinducerassemblygroundwirefromtheblower deck 3 Remove 3 screws securing the inducer assembly to the header box 4 Rotate the inducer assembly to its new position 5 Secure the...

Страница 17: ...eningbetween the furnace cabinet and the 2 PVC vent pipe The rubber grommet should be installed in the 3 hole prior to running the vent pipe out of cabinet No sealants are required See Figure 19 page...

Страница 18: ...ropriate primer and cement 3 Install the 1 2 x 1 2 hose barb on the 2 PVC reducer NOTE Do not over tighten Use an adequate amount of Teflon tape on the threads Do not use liquid sealants 4 Verify all...

Страница 19: ...ent feet while maintaining 1 4 per foot slope and insulated if located in an unconditioned space THREE GENERAL PRINCIPLES APPLY Each condensate drain must be trapped separately using a J Trap or field...

Страница 20: ...commended for this type of furnace but may be used if allowed by local jurisdiction Only new flexible connectors may be used Do not use a connector which has previously serviced another gas appliance...

Страница 21: ...r changing the regulator pressure or the orifices it is required that you measure the gas input rate This may be accomplished in the usual way by clocking the gas meter and using the local gas heating...

Страница 22: ...eft Side Entry See Note A See Note A Burner Assembly Burner Assembly Burner Assembly Manifold Manifold Manifold Manifold Gas Valve Drip Leg Drip Leg Drip Leg Shut Off Valve Shut Off Valve Shut Off Val...

Страница 23: ...local codes for Shut Off Valve location requirements NOTE B Inducer assembly omitted for clarity of pipe installatio Burner Assembly Manifold Drip Leg Drip Leg Shut Off Valve Shut Off Valve Gas Valve...

Страница 24: ...ee Figure 26 page 25 or the wiring diagram label inside of the control door Any other wiring methods must be acceptable to authority having jurisdiction Proper line voltage polarity must be maintained...

Страница 25: ...OT install the thermostat on an outside wall or any other location where its operation may be adversely affected by radiant heat from fireplaces sunlight or lighting fixtures and convective heat from...

Страница 26: ...ry furnace to the coil side of the relay using field supplied wire and 3 16 terminals Connect C from the primary furnace to the coil side of the relay using field supplied wire and 3 16 terminals NOTE...

Страница 27: ...to obtain the input rate in Btuh See example EXAMPLE Time for 1 revolution of a gas meter with a 1 cubic ft dial 40 seconds From Table 6 read 90 cubic ft gas per hr Local heating value of the gas obta...

Страница 28: ...a green and a red LED labeled Status on the motor control board to provide system faults as described below Refer to Table 15 page 49 for Nordyne UTEC boards or Table 14 page 49 for Emerson boards to...

Страница 29: ...e 51 or Figure 48 page 52 for component location 1 Shut off gas supply to the furnace at the meter or at a manual valve in the supply piping 2 Turn off all power to the furnace and set the thermostat...

Страница 30: ...2 Front Brace LEFT SIDE RIGHT SIDE Electric 7 8 25 1 2 22 1 2 Gas 1 5 8 Vent pipe 3 Cond 1 1 16 B 19 FLANGES TOP VIEW C BOTTOM VIEW Electric 7 8 Vent pipe 3 Cond 1 1 16 FRONT VIEW 28 3 Flue Combustion...

Страница 31: ...23 1 2 C 34 1 2 22 1 2 2 3 4 Bottom Panel 25 3 8 22 1 2 17 1 4 17 7 8 28 B 19 22 1 2 24 7 8 15 23 1 1 4 Front Brace BOTTOM VIEW TOP VIEW 4 Knockouts both sides 1 LEFT SIDE RIGHT SIDE 3 1 4 Gas 1 5 8 T...

Страница 32: ...e original wire as supplied with the furnace must be replaced it must be replaced with wiring material having a temperature of at least 105 C Use copper conductors only Diagnostic Description Green LE...

Страница 33: ...the furnace for the proper heating and cooling speeds for your application If any of the original wire as supplied with the furnace must be replaced it must be replaced with wiring material having a t...

Страница 34: ...TRONIC AIR CLEANER HUMIDIFIER HOT SURFACE IGNITOR INDUCER 120 VAC 24 VAC TRANSFORMER K4 K3 K2 P1 7 EAC P2 3 HUM P2 1 XFORMER NEUTRAL NEUTRAL NEUTRAL NEUTRAL P2 4 P2 6 NEUTRAL SUPPLY AIR LIMIT ROLL OUT...

Страница 35: ...SOR ELECTRONIC AIR CLEANER HUMIDIFIER HOT SURFACE IGNITOR INDUCER 120 VAC 24 VAC TRANSFORMER K4 K3 K2 P1 2 EAC P2 1 HUM P2 2 XFORMER NEUTRAL NEUTRAL NEUTRAL NEUTRAL NEUTRAL NEUTRAL NEUTRAL SUPPLY AIR...

Страница 36: ...44 220 439 84 43 214 429 86 42 209 419 88 41 205 409 90 40 200 400 92 39 196 391 94 38 191 383 96 38 188 375 98 37 184 367 100 36 180 360 102 35 176 353 104 35 173 346 106 34 170 340 108 33 167 333 11...

Страница 37: ...SURE 6 000 to 7 999 FT 57 61 57 57 57 57 56 56 ORIFICE SIZE 9 0 8 0 9 0 9 0 9 0 9 0 9 0 9 0 MANIFOLD PRESSURE 8 000 to 10 000 FT 57 61 57 57 57 57 56 56 ORIFICE SIZE 8 5 7 5 8 5 8 5 8 5 8 5 8 5 8 5 MA...

Страница 38: ...000 to 9 999 FT 49 53 49 49 49 49 48 48 ORIFICE SIZE 3 0 2 8 2 8 2 8 2 8 2 8 2 8 2 8 MANIFOLD PRESSURE HIGH ALTITUDE DERATION NATURAL GAS WITH LOW HEATING VALUE ALTITUDE ABOVE SEA LEVEL INPUT BTU 38 0...

Страница 39: ...supply inlet to building or the combustion air inlet to any other appliance 6 inches 15cm for appliances 10 000 Btuh 3kW 6 inches 15cm for appliances 10 000 Btuh 3kW 4 ft 1 2m below or to side of open...

Страница 40: ...Pipe must slope upward 1 4 per foot 5 7 90 Elbows 90 Elbow COMBUSTION AIR Straps or other suitable supports at minimum 5 ft intervals both pipes 90 Elbows Flue Pipe must slope upward 1 4 per foot Firs...

Страница 41: ...llector Box Drain Factory Equipped See NOTE 2 Inline Drain Field Supplied See NOTES 2 3 Collector Box Drain Factory Equipped See NOTE 2 X See NOTE 5 X See NOTE 5 FLUE PIPE X See NOTE 5 X See NOTE 5 FL...

Страница 42: ...TAL RIGHT 1 PIPE OPTIONS Plug VIEW D VIEW E VIEW F VIEW G COMBUSTION AIR FLUE PIPE OPTION 7 OPTION 8 COMBUSTION AIR Rubber Grommet See VIEW D for drain line positions See VIEW E for drain line positio...

Страница 43: ...in Factory Equipped See NOTE 2 Inline Drain Field Supplied See NOTES 2 3 Collector Box Drain Factory Equipped See NOTE 2 Inline Drain Field Supplied See NOTES 2 3 Inline Drain Factory Supplied See NOT...

Страница 44: ...BUSTION AIR PVC Tee PVC Trap X See NOTE 5 X See NOTE 5 X See NOTE 5 X See NOTE 5 Inline Drain Factory Supplied See NOTE 4 Collector Box Drain Factory Equipped See NOTE 2 Inline Drain Factory Supplied...

Страница 45: ...to furnace connection as possible Wall Normal Snow Level COMBUSTION AIR 90 Elbow both ends Seal Caulk Around Pipes at Building 90 Elbow 7 12 Min 90 Elbow 90 Elbow Support System on Vertical Rise COMB...

Страница 46: ...Inline Drain Tube Factory Supplied See NOTE 4 Collector Box Drain Factory Equipped See NOTES 2 3 Inline Drain Tube Field Supplied See NOTE 3 Collector Box Drain Factory Equipped See NOTES 2 3 X See N...

Страница 47: ...ug Plug See VIEW R for drain line positions Flange Flange Option 25 Option 26 SD SERIES HORIZONTAL LEFT 1 PIPE OPTION SD SERIES HORIZONTAL LEFT 2 PIPE OPTION SD SERIES HORIZONTAL RIGHT 2 PIPE OPTION C...

Страница 48: ...ctor Box Drain Factory Equipped See NOTE 2 Inline Drain Factory Supplied See NOTE 4 PVC Trap PVC Tee PVC Trap PVC Tee PVC Trap PVC Tee PVC Trap Collector Box Drain Factory Equipped See NOTE 2 Collecto...

Страница 49: ...and repair the problem If the furnace still doesn t operate check the Flame Roll out Switches and reset if necessary If the furnace operates when the Flame Rollout Switch is reset contact a qualified...

Страница 50: ...e end burner If no flame is detected the furnace will shut down within 4 seconds Flame Roll Out Switch Verifies that the burner flames are drawn into the heat exchanger tubes If the burner flames are...

Страница 51: ...ondensate B C D cabinets only Roll Out Switch Transformer Vent Limit Switch UPFLOW HORIZONTAL FURNACE SC SERIES Burner Assembly Finish Flange Flame Sensor Igniter Roll Out Switch Gas Valve Furnace Con...

Страница 52: ...sure Switch Vent Limit Switch Control Board Main Air Limit Switch Transformer Roll Out Switch DOWNFLOW FURNACE SL SERIES Burner Assembly Flame Sensor Roll Out Switch Finish Flange Blower Assembly behi...

Страница 53: ...53...

Страница 54: ...54...

Страница 55: ...55...

Страница 56: ...S NO Is there proper draft YES NO ATTENTION INSTALLERS It is your responsibility to know this product better than your customer This includes being able to install the product according to strict safe...

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