Carrier 58CTW Installation, Start-Up, Operating And Service And Maintenance Instructions Download

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58CTW/CTY

Variable---Speed, ECM

Induced---Combustion 2---Stage Deluxe

4---Way Multipoise Gas Furnace

Series 100

Installation, Start---up, Operating and

Service and Maintenance Instructions

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . . . . . .

INTRODUCTION

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CODES AND STANDARDS

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Safety

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Installation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Combustion and Ventilation Air

. . . . . . . . . . . . . . . . . . . . . .

Duct Systems

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Acoustical Lining and Fibrous Glass Duct

. . . . . . . . . . . . . . .

Gas Piping and Gas Pipe Pressure Testing

. . . . . . . . . . . . . . .

Electrical Connections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Venting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS

PROCEDURE

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LOCATION

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AIR FOR COMBUSTION AND VENTILATION

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Outdoor Combustion Air Method

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The Standard Method:

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Combination of Indoor and Outdoor Air

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INSTALLATION

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Bottom Return Air Inlet

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Side Return Air Inlet

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Leveling Legs (If Desired)

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Bottom Return Air Inlet

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Suspended Furnace Support

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Platform Furnace Support

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Roll--Out Protection

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Bottom Return Air Inlet

. . . . . . . . . . . . . . . . . . . . . . . . . .

Side Return Air Inlet

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Filter Arrangement

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AIR DUCTS

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General Requirements

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Ductwork Acoustical Treatment

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Supply Air Connections

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Upflow and Horizontal Furnaces

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Downflow Furnaces

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Return Air Connections

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Downflow Furnaces

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Upflow and Horizontal Furnaces

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GAS PIPING

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ELECTRICAL CONNECTION

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ACCESSORIES

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VENTING

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

START--UP, ADJUSTMENT, AND SAFETY CHECK

. . . . .

General

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Start--Up Procedures

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Adjustments

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Check Safety Controls

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Checklist

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SERVICE AND MAINTENANCE PROCEDURES

. . . . . . .

General

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Care and Maintenance

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Sequence of Operation

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Wiring Diagram

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting

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PARTS REPLACEMENT INFORMATION GUIDE

. . . . . . .

Always Ask For

Use of the AHRI Certified

Mark indicates a

manufacturer’s participation in the program. For
verification of certification for individual products,
go to www.ahridirectory.org.

NOTE

: Read the entire instruction manual before starting the

installation.
Portions of the text and tables are reprinted from NFPA 54/ANSI

Z223.1--2012

, with permission of National Fire Protection

Association, Quincy, MA 02269 and American Gas Association,
Washington DC 20001. This reprinted material is not the

complete and official position of the NFPA or ANSI on the
referenced subject, which is represented only by the standard in

its entirety.

Summary of Contents for 58CTW

Page 1: ...reatment 13 Supply Air Connections 14 Upflow and Horizontal Furnaces 14 Downflow Furnaces 14 Return Air Connections 20 Downflow Furnaces 20 Upflow and Horizontal Furnaces 20 GAS PIPING 20 ELECTRICAL CONNECTION 21 ACCESSORIES 23 VENTING 23 START UP ADJUSTMENT AND SAFETY CHECK 35 General 35 Start Up Procedures 36 Adjustments 38 Check Safety Controls 45 Checklist 45 SERVICE AND MAINTENANCE PROCEDURES...

Page 2: ...l injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation 1 Use only with type of gas approved for this furnace Refer to the furnace rating plate 2 Install this furnace only in a location and position as spe cified in the Location section of these instructions 3 Provide adequate combustion and ventilation air t...

Page 3: ...3 A10269 Fig 1 Clearances to Combustibles ...

Page 4: ...W Washington DC 20001 www AGA org Combustion and Ventilation Air Section 9 3 NFPA 54 ANSI Z223 1 2012 Air for Combustion and Ventilation Duct Systems Air Conditioning Contractors Association ACCA Manual D Sheet Metal and Air Conditioning Contractors National Association SMACNA or American Society of Heating Refrigeration and Air Conditioning Engineers ASHRAE 2001 Fundamentals Handbook Chapter 35 o...

Page 5: ... b For 1200 CFM 20 in 508 mm round or 14 1 2 x 19 1 2 in 368 x 495 mm rectangle c For 1600 CFM 22 in 559 mm round or 14 1 2 x 22 1 16 in 368 x 560mm rectangle d For airflow requirements above 1800 CFM see Air Delivery table in Product Data literature for specific use of single side inlets The use of both side inlets a combination of 1 side and the bottom or the bottom only will ensure adequate ret...

Page 6: ... sure all combustion and circulating air requirements are met in addition to all local codes and ordinances WARNING The following types of furnace installations may require OUTDOOR AIR for combustion due to chemical exposures S Commercial buildings S Buildings with indoor pools S Laundry rooms S Hobby or craft rooms and S Chemical storage areas If air is exposed to the following substances it shou...

Page 7: ... containing the furnace This prevents a negative pressure condition as created by the circulating air blower causing a flame rollout and or drawing combustion products into the structure The furnace is controlled by a thermostat It may not be hot wired to provide heat continuously to the structure without thermostatic control Clean outside air is provided for combustion This is to minimize the cor...

Page 8: ...99 1 2 200 62 2 3 300 93 4 4 400 124 5 5 500 155 7 6 600 186 8 7 700 218 0 0 20 3 150 89 1 4 200 118 9 5 250 148 6 3 300 93 4 4 950 140 1 6 600 186 8 8 250 233 6 9 900 280 3 11 550 327 0 0 10 6 300 178 3 8 400 237 8 10 500 297 3 6 600 186 8 9 900 280 3 13 200 373 7 16 500 467 2 19 800 560 6 23 100 654 1 0 00 NP NP NP NP NP NP NP NP NP NP Not Permitted Note Not all models have these sizes AIR FOR C...

Page 9: ...for combined input of all gas appli ances in the space per Table 1 and b Not less than the sum of the areas of all vent connect ors in the space CIRCULATING AIR DUCTS 6 MIN FRONT Ü CIRCULATING AIR DUCTS VENT THROUGH ROOF 1 SQ IN PER 1000 BTUH IN DOOR OR WALL 12 MAX 1 SQ IN PER 1000 BTUH IN DOOR OR WALL 12 MAX UNCONFINED SPACE INTERIOR HEATED SPACE CLEARANCE IN FRONT OF COMBUSTION AIR OPENINGS SHAL...

Page 10: ...manent ventilation and dilution of flue gases However in buildings with unusually tight construction additional air MUST be provided using the methods de scribed in the Outdoor Combustion Air Method section 4 Unusually tight construction is defined as Construction with a Walls and ceilings exposed to the outdoors have a con tinuous sealed vapor barrier Openings are gasketed or sealed and b Doors a...

Page 11: ...iscard this panel when bottom return air is used To remove bottom closure panel perform the following 1 Tilt or raise furnace and remove 2 screws holding bottom filler panel See Fig 9 2 Rotate bottom filler panel downward to release holding tabs 3 Remove bottom closure panel 4 Reinstall bottom filler panel and screws HORIZONTAL INSTALLATION FIRE EXPLOSION AND CARBON MONOXIDE POISONING HAZARD Failu...

Page 12: ...move and discard this panel when bottom return air is used To remove bottom closure panel perform the following 1 Tilt or raise furnace and remove two screws holding bot tom filler panel See Fig 9 2 Rotate bottom filler panel downward to release holding tabs 3 Remove bottom closure panel 4 Reinstall bottom filler panel and screws Side Return Air Inlet These furnaces are shipped with bottom closure...

Page 13: ...w this warning could result in personal injury or death Never operate a furnace without a filter or with filter access door removed WARNING There are no provisions for an internal filter rack in these furnaces A field supplied accessory external filter rack is required Refer to the instructions supplied with the external filter rack for assembly and installation options AIR DUCTS General Requireme...

Page 14: ...sing NOTE For horizontal applications the top most flange may be bent past 90_ to allow the evaporator coil to hang on the flange temporarily while the remaining attachment and sealing of the coil are performed Downflow Furnaces Connect supply air duct to supply air outlet on furnace Bend flange inward past 90_ with wide duct pliers See Fig 14 The supply air duct must be connected to ONLY the furn...

Page 15: ...Q PER ROD 8 203mm MIN FOR DOOR REMOVAL OUTER DOOR ASSEMBLY A10130 Fig 15 Horizontal Unit Suspension METHOD 2 USE 4 8 x 3 4 19 mm SHEET METAL SCREWS FOR EACH STRAP THE STRAPS SHOULD BE VERTICAL AGAINST THE FURNACE SIDES AND NOT PULL AWAY FROM THE FURNACE SIDES METHOD 1 FOLD ALL STRAPS UNDER FURNACE AND SECURE WTH 4 8 x 3 4 19 mm SHEET METAL SCREWS 2 SCREWS IN SIDE AND 2 SCREWS IN BOTTOM A10131 Fig ...

Page 16: ...RSECTIONS OF THE TOP AND TWO SIDES OF THE FURNACE JACKET AND BUILDING JOISTS STUDS OR FRAMING GAS ENTRY 17 3 4 451mm OVERALL 4 3 4 121mm UNDER DOOR 1 25mm UNDER FURNACE EXTEND OUT 12 305mm FROM FACE OF DOOR WHEN USED WITH SINGLE WALL VENT CONNECTIONS UNION 152mm 451mm 559mm A10164 Fig 17 Typical Attic Installation A02075 Fig 18 Upflow Return Air Configurations and Restrictions ...

Page 17: ...17 DOWNFLOW RETURN AIR CONFIGURATIONS AND RESTRICTIONS A02163 Fig 19 Downflow Return Air Configurations and Restrictions A02162 Fig 20 Horizontal Return Air Configurations and Restrictions ...

Page 18: ...5 1325 1280 1210 OFF OFF ON 640 See note 4 OFF ON OFF 840 775 700 640 See note 4 OFF ON ON 1045 980 920 860 805 750 690 640 See note 4 ON OFF OFF 1220 1175 1120 1075 1025 970 925 875 820 775 ON OFF ON 1390 1335 1290 1245 1200 1155 1105 1055 1015 970 ON ON OFF 1615 1570 1530 1490 1450 1405 1365 1325 1280 1210 ON ON ON 1890 1850 1810 1750 1685 1615 1545 1475 1395 1275 Maximum Clg Airflow2 1890 1850 ...

Page 19: ...1245 1180 1085 1015 935 880 805 ON OFF ON 1670 1605 1540 1480 1425 1350 1280 1220 1135 1070 ON ON OFF 2040 1985 1930 1880 1830 1775 1715 1660 1595 1510 ON ON ON 2520 2455 2405 2350 2290 2195 2090 1965 1815 1615 Maximum Clg Airflow2 2520 2455 2405 2350 2290 2195 2090 1965 1815 1615 High Heat Airflow3 2260 2205 2150 2100 2045 1985 1925 1855 1745 1600 Low Heat Airflow3 2005 1950 1895 1845 1790 1735 1...

Page 20: ...e maximum length shall not exceed 36 in 915 mm 3 When lever handle type manual equipment shutoff valves are used they shall be T handle valves 4 The use of copper tubing for gas piping is NOT approved by the state of Massachusetts Refer to Table 5 for recommended gas pipe sizing Risers must be used to connect to furnace and to meter Support all gas piping with appropriate straps hangers etc Use a ...

Page 21: ...eration serious injury death or property damage Improper servicing could result in dangerous operation serious injury death or property damage Before servicing disconnect all electrical power to furnace When servicing controls label all wires prior to disconnection Reconnect wires correctly Verify proper operation after servicing WARNING ELECTRICAL SHOCK HAZARD Failure to follow this warning could...

Page 22: ...D status indicator light will flash rapidly and furnace will NOT operate J Box Relocation NOTE If factory location of J Box is acceptable go to next section ELECTRICAL CONNECTION to J Box NOTE On 14 in 356 mm wide casing models the J Box shall not be relocated to other side of furnace casing when the vent pipe is routed within the casing 1 Remove and save two screws holding J Box See Fig 23 NOTE T...

Page 23: ...ed for the type of cable used 4 Secure field ground wire to green ground screw on J Box bracket 5 Connect line voltage leads as shown in Fig 25 6 Reinstall cover to J Box Do not pinch wires between cover and bracket 24 V Wiring Make field 24 v connections at the 24 v terminal strip See Fig 25 34 Connect terminal Y Y2 as shown in Fig 27 34 for proper cooling operation Use only AWG No 18 color coded...

Page 24: ...REE PHASE 208 230 VOLT SINGLE PHASE WHT BLK WHT BLK W W1 W2 Y Y2 G NOTES 1 2 3 A95236 Fig 25 Field Wiring Diagram 24 V THERMOSTAT TERMINALS PL2 HOT SURFACE IGNITER INDUCER MOTOR CONNECTOR 115 VAC L2 NEUTRAL CONNECTIONS 115 VAC L1 LINE VOLTAGE CONNECTIONS EAC 1 TERMINAL 115 VAC 1 0 AMP MAX PL1 LOW VOLTAGE MAIN HARNESS CONNECTOR TRANSFORMER 24 VAC CONNECTIONS 3 AMP FUSE STATUS AND COMM LED LIGHTS SW...

Page 25: ...r previous conditions of use WARNING Vent system or vent connectors may need to be resized Vent systems or vent connectors must be sized to approach minimum size as determined using appropriate table found in the current edition of NFGC General Venting Requirements Follow all safety codes for proper vent sizing and installation requirements including local building codes the National Fuel Gas Code...

Page 26: ... Fig 28 Two Stage Furnace with Two Speed Air Condi tioner See notes 1 2 4 6 7 9 10 11 and 15 on the page following these figures A03180 Fig 29 Two Stage Furnace with Single Speed Heat Pump Dual Fuel See notes 1 2 3 4 6 8 9 10 12 13 and 15 on the page following these figures A03178 Fig 30 Two Stage Furnace with Two Speed Heat Pump Dual Fuel ...

Page 27: ... page following these figures A03182 Fig 32 Dual Fuel Thermostat with Two Stage Furnace and Two Speed Heat Pump See notes 2 11 and 12 on the page following these figures A03183 Fig 33 Two Stage Thermostat with Two Stage Furnace and Two Speed Air Conditioner See notes 1 and 2 on the page following these figures A03184 Fig 34 Single Stage Thermostat with Two Stage Furnace and Two Speed Air Condition...

Page 28: ...Configuration Option No 10 Dual Fuel Selection must be turned ON in all dual fuel applications 10 NO connection should be made to the furnace HUM terminal when using a Thermidistat 11 Optional connection If wire is connected dip switch SW1 2 on furnace control should be set in ON position to allow Thermidistat Thermostat to control furnace staging 12 Optional connection If wire is connected ACRDJ ...

Page 29: ...al vent fuel oil residue Is liner and top seal in good condition Is chimney property lined with clay tile liner Crown condition Missing mortar or brick Rebuild crown Yes Yes No No No Reline Yes Repair Yes Yes Yes No No Remove mortar and tile debris Remove metal vent or liner No No No No Yes Yes Suitable Suitable Not Suitable Line chimney with property sized listed flexible metal liner or Type B ve...

Page 30: ...tional information on condensate drains b Indicates the chimney exceeds the maximum permiss ible size in the tables the chimney should be rebuilt or relined to conform to the requirements of the equip ment being installed and the authority having jurisdic tion A chimney without a clay tile liner which is otherwise in good condition shall be rebuilt to conform to ANSI NFPA 211 or be lined with a UL...

Page 31: ...urnaces A field supplied 4 in 102 mm to 5 in 127 mm or 4 in 102 mm to 6 in 152 mm sheet metal increaser fitting is required when 5 in 127 mm or 6 in 152 mm vent connector is used See Fig 36 48 Venting Orientation for approved vent configurations NOTE Vent connector length for connector sizing starts at furnace vent elbow The 4 in 102 mm vent elbow is shipped for upflow configuration and may be rot...

Page 32: ... 4 7 8 9 on the pages following these figures A03209 Fig 37 Upflow Application Vent Elbow Right SEE NOTES 1 2 3 4 5 7 8 9 on the page following these figures A03210 Fig 38 Downflow Application Vent Elbow Up then Left SEE NOTES 1 2 4 5 7 8 9 on the page following these figures A03211 Fig 39 Downflow Application Vent Elbow Up ...

Page 33: ...ownflow Application Vent Elbow Up then Right SEE NOTES 1 2 4 7 8 9 on the page following these figures A03213 Fig 42 Horizontal Left Application Vent Elbow Left SEE NOTES 1 2 4 5 7 8 9 on the page following these figures A03214 Fig 43 Horizontal Left Application Vent Elbow Right then Up SEE NOTES 1 2 4 7 8 9 on the page following these figures A03218 Fig 44 Horizontal Right Application Vent Elbow ...

Page 34: ...hen factory approved Downflow Vent Guard Kit is used in the downflow position See Product Data Sheet for accessory listing 4 Type B vent where required refer to Note 1 above 5 A 4 in 102 mm single wall 26 ga min vent must be used inside furnace casing and when the factory approved Downflow Vent Guard Kit is used external to the furnace See Product Data Sheet for accessory listing 6 Accessory Downf...

Page 35: ... AND SAFETY CHECK General FIRE HAZARD Failure to follow this warning could result in personal injury death or property damage This furnace is equipped with manual reset limit switches in the gas control area The switches open and shut off power to the gas valve if a flame rollout or overheating condition occurs in the gas control area DO NOT bypass the switches Correct problem before resetting the...

Page 36: ...elf Test Remove Blower Access Door Disconnect the thermostat R lead from furnace control board Manually close blower door switch Turn Setup DIP switch SW1 6 ON See Fig 26 55 and Table 52 NOTE The furnace control allows all components except the gas valve to be run for short period of time This feature helps diagnose a system problem in case of a component failure Component test feature will not op...

Page 37: ...and SW 1 5 OFF 350 CFM per ton nominal when SW 2 2 OFF and SW 1 5 OFF 370 CFM per ton nominal when SW2 2 ON and SW 1 5 ON 400 CFM per ton nominal when SW 2 2 OFF and SW 1 5 ON See Air Delivery Tables for model specific CFM vs static pressure SW 2 6 7 8 AC Cooling Airflow OFF The AC setup switches select desired cooling or high stage cooling two stage units airflow See Cooling Air Delivery Tables f...

Page 38: ...e correct input rate 2 Determine the correct orifice and manifold pressure adjust ment All models in all positions use Table 12 22 000 Btuh per burner See input listed on rating plate a Obtain average yearly gas heat value at installed alti tude from local gas supplier b Obtain average yearly gas specific gravity from local gas supplier c Find installation altitude in Table 12 d Find closest natur...

Page 39: ... the meter b Move setup switch SW1 2 to ON position This keeps furnace locked in low heat operation c Jumper R to W W1 d Run furnace for 3 minutes in low heat operation e Measure time in sec for gas meter to complete 1 revolution and note reading The 2 or 5 cubic feet dial provides a more accurate measurement of gas flow f Refer to Table 11 for cubic ft of gas per hr g Multiply gas rate cu ft hr b...

Page 40: ...he R W W1 circuit Accurate amp draw readings can be obtained at the wires normally connected to ther mostat subbase terminals R and W The thermostat anticipator should NOT be in the circuit while measur ing current 1 Set SW1 2 switch on furnace control board to ON 2 Remove thermostat from subbase or from wall 3 Connect an amp meter as shown in Fig 51 across the R and W subbase terminals or R and W...

Page 41: ...41 A14327 Fig 55 Wiring Diagram ...

Page 42: ...2 281 23 157 313 783 66 54 109 273 24 150 300 750 68 53 106 265 25 144 288 720 70 51 103 257 26 138 277 692 72 50 100 250 27 133 267 667 74 48 97 243 28 129 257 643 76 47 95 237 29 124 248 621 78 46 92 231 30 120 240 600 80 45 90 225 31 116 232 581 82 44 88 220 32 113 225 563 84 43 86 214 33 109 218 545 86 42 84 209 34 106 212 529 88 41 82 205 35 103 206 514 90 40 80 200 36 100 200 500 92 39 78 19...

Page 43: ...3 3 1 4 43 3 4 1 5 43 3 5 1 5 43 3 6 1 6 925 44 3 5 1 5 43 3 2 1 4 43 3 3 1 4 43 3 4 1 5 950 44 3 4 1 5 44 3 5 1 5 44 3 6 1 6 43 3 2 1 4 975 44 3 2 1 4 44 3 3 1 4 44 3 4 1 5 44 3 5 1 5 1000 45 3 7 1 6 45 3 8 1 7 44 3 2 1 4 44 3 4 1 5 ALTITUDE RANGE FT M AVG GAS HEAT VALUE BTUH CU FT SPECIFIC GRAVITY OF NATURAL GAS 0 58 0 60 0 62 0 64 Orifice No Manifold Pressure High Low Orifice No Manifold Pressu...

Page 44: ... 6 850 47 3 5 1 5 47 3 6 1 6 47 3 8 1 6 46 3 4 1 5 ALTITUDE RANGE FT M AVG GAS HEAT VALUE AT ALTITUDE BTUH CU FT SPECIFIC GRAVITY OF NATURAL GAS 0 58 0 60 0 62 0 64 Orifice No Manifold Pressure High Low Orifice No Manifold Pressure High Low Orifice No Manifold Pressure High Low Orifice No Manifold Pressure High Low USA 7001 to 8000 2134 to 2438 650 44 3 6 1 6 43 3 2 1 4 43 3 4 1 5 43 3 5 1 5 675 4...

Page 45: ...er glows when inducer motor is disconnected shut down furnace immediately e Determine reason pressure switch did not function properly and correct condition f Turn off 115 v power to furnace g Reconnect inducer motor wires replace outer door and turn on 115 v power h Blower will run for 90 seconds before beginning the call for heat again i Furnace should ignite normally Checklist 1 Put away tools ...

Page 46: ...t 7 Status Codes in order of occurrence 1 To retrieve status codes proceed with the following NOTE NO thermostat signal may be present at control and all blower OFF delays must be completed a Leave 115 v power to furnace turned on b Remove outer access door c Look into blower access door sight glass for current LED status d Remove blower access door NOTE The Status Codes cannot be retrieved by dis...

Page 47: ...eason for rust corrosion soot or excessive dust If necessary have furnace and burner serviced by a qualified service agency 5 Inspect the vent pipe vent system before each heating sea son for rust corrosion water leakage sagging pipes or broken fittings Have vent pipes vent system serviced by a qualified service agency 6 Inspect any accessories attached to the furnace such as a humidifier or elect...

Page 48: ...ing and set screw contacts the flat portion of the motor shaft Loosen set screw on blower wheel and reposition if neces sary 12 Spin the blower wheel by hand to verify that the wheel does not rub on the housing 13 Reinstall blower assembly in furnace 14 Reinstall 2 screws securing blower assembly to blower deck 15 Reconnect blower leads to furnace control Refer to fur nace wiring diagram and conne...

Page 49: ...nto end of spring cable and crimp tight with crimping tool or crimp by striking with ball peen hammer TIGHTNESS IS VERY IMPORTANT NOTE The materials needed in item 9 can usually be purchased at local hardware stores 1 Attach variable speed reversible drill to the end of spring cable end opposite brush 2 Insert brush end of cable into the outlet opening of cell and slowly rotate with drill DO NOT f...

Page 50: ...ion is based upon the stored history of the length of previous gas heating periods of the single stage thermostat The furnace will start up in either low or high heat If the furnace starts up in low heat the control CPU determines the low heat on time from 0 to 16 minutes which is permitted before switching to high heat If the power is interrupted the stored history is erased and the control CPU w...

Page 51: ... the furnace control CPU will switch the inducer motor IDM speed from low to high The high heat pressure switch relay HPSR is de energized to close the NC contact When sufficient pressure is available the high heat pressure switch HPS closes and the high heat gas valve solenoid GV HI is ener gized The blower motor BLWM will transition to high heat airflow five seconds after the R to W2 cir cuit cl...

Page 52: ...r motor BLWM will drop the blower airflow to 90 percent of low cooling airflow which is the true on board CF continuous fan selection as shown in Fig 53 b High cooling When the R to G and Y Y2 circuit is closed and there is a demand for dehumidification the furnace blower motor BLWM will drop the blower airflow to 90 percent of high cooling airflow High cooling airflow is based on the A C air cond...

Page 53: ...roblem in the case of a component fail ure To initiate the component test procedure ensure that there are no thermostat inputs to the control and all time delays have expired Turn on setup switch SW1 6 See Fig 26 NOTE The component test feature will not operate if the control is receiving any thermostat signals or until all time delays have expired The component test sequence is as follows a The f...

Page 54: ...signals Run system through a low heat high heat or cooling cycle to check operation Status codes are erased after 72 hours or can be manually erased by putting setup switch SW1 1 in the ON position and jumpering R W W1 and Y Y2 simultaneously until status code 11 is flashed Is 24V present at W W1 W2 Y1 Y Y2 or G thermostat terminals on the furnace control Check room thermostat or interconnecting c...

Page 55: ...period the control will repeat the ignition sequence 3 more times before lockout 14 occurs If flame signal is lost during the blower on delay period blower will come on for the selected blower off delay Check the following items first before proceeding to the next step Gas valve turned off Manual shut off valve Green Yellow wire MUST be connected to furnace sheet metal Flame sensor must not be gro...

Page 56: ...r Heating Equipment or Air Conditioning Contractors and Systems headings for dealer listing by brand name or contact CARRIER CORPORATION Consumer Relations Department P O Box 4808 Syracuse New York 13221 4808 1 800 CARRIER Have available the model number series number and serial number located on the unit rating plate to ensure correct replacement part Example of Model Number MODEL HEATING SIZE VA...

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