Nortek FG7SC Installation Instructions Manual Download

Page: 34 / 56

Single Stage Furnaces

LADDER DIAGRAM

1029967A

(10299670)

02/2020

FIELD WIRING

LEGEND:

LOW VOLTAGE

HIGH VOLTAGE

Quantity and types of
limits and switches
may vary with models.

See Note

DOOR

SWITCH

GND

BLOWER

MOTOR

CHOKE

(SOME MODELS)

GND

FLAME SENSOR

ELECTRONIC

AIR CLEANER

HUMIDIFIER

HOT SURFACE IGNITOR

INDUCER

120 VAC

24 VAC

TRANSFORMER

P1-7

EAC

P2-3

HUM

P2-1

XFORMER

NEUTRAL

P2-4

P2-6

NEUTRAL

SUPPLY AIR

LIMIT

ROLL-OUT

LIMIT

VENT

LIMIT

BLOWER

LIMIT

SWITCH

BLOWER

DECK LIMIT

SWITCH

24V

P1-8

P1-3

P1-5

P1-6

P1-2

COM

P1-4

PRESSURE

SWITCH

24V

GND

P1-9

GAS

VLV

MICRO

TO MOTOR

RELAYS

3A FUSE

BLOWER

MOTOR

MED-HI

MED-LO

Figure 36. Nordyne/UTEC Ladder Diagram

Summary of Contents for FG7SC

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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Page 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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