Carrier bryant 915SB Installation, Start-Up, Operating And Service And Maintenance Instructions Download

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915SB: Installation, Start-up, Operating and Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

• Increase blower speed to reduce temperature rise.

• Decrease blower speed to increase temperature rise.
Change the blower heat taps as required to maintain proper temperature

rise for Heating and Cooling as described above. To change blower

motor speed selections for heating mode, remove blower motor lead

from control HEAT terminal. See

Fig. 38

. Select desired blower motor

speed lead from one of the other motor leads and relocate it/them to

HEAT (heating blower tap) terminal(s). Reconnect original lead on

SPARE terminal.

Adjust Blower Off Delay (Heat Mode)

If desired, the main blower off time delay period may be lengthened or

shortened when operating in the heating mode to provide greater

comfort. For position and location of jumpers on control center, see

Fig. 38

and

Fig. 73

Table 19 – Blower Off Delay Jumper Positions

The blower off delay has four adjustable settings from 90 sec to 180 sec.

See

Table 19

. The blower off delay jumpers are located on the furnace

control See

Fig. 38

and

Fig. 73

. To change the blower off delay setting,

move the jumper from one set of pins on the control to the pins used for

the desired blower off delay. Factory blower off delay setting is 120 sec.

WARNING

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal injury or death.

Disconnect 115vac electrical power before changing speed tap.
(Read following caution before changing taps).

CAUTION

UNIT DAMAGE HAZARD

To avoid operating outside the rise range and avoid component damage:
Refer to the Air Delivery Tables to determine which airflows and

settings are allowed for proper heating airflow. DO NOT use the

highlighted settings for Heating airflow. The highlighted settings are to

be used for Cooling and Continuous Fan ONLY.

WARNING

FIRE HAZARD

Failure to follow this warning could result in personal injury, death,

and/or property damage.

Reinstall manifold pressure tap plug in gas valve to prevent gas leak.

CAUTION

FURNACE OVERHEATING HAZARD

Failure to follow this caution may result in reduced furnace life.
Recheck temperature rise. It must be within limits specified on the

rating plate. Recommended operation is at the mid-point of rise range

or slightly above.

PINS

1 AND 2

2 AND 3

3 AND 4

4 AND 5

Time (in sec.)

120

150

180

Table 20 – Air Delivery - CFM (With Filter)

UNIT SIZE

WIRE LEAD

COLOR

SPEED

TAPS

2, 3

(Function)

EXTERNAL STATIC PRESSURE (IN.W.C.)

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

30026E14

Black

Cooling. Do not use for heating

1045 1010

975

935

895

855

810

760

715

670

Yellow

Alt Cooling or alt Heating

820

770

730

680

630

585

530

480

435

385

Orange

Alt Cooling or alt Heating

655

600

550

495

435

385

335

265

Blue

Heating or alt Cooling

605

545

490

435

375

335

255

Red

Alt Cooling. Do not use for heating

480

415

360

305

235

30040E14

Gray

Cooling. Do not use for heating

1050 1025 1000

975

950

920

895

870

845

820

Yellow

Alt Cooling. Do not use for heating

920

890

860

830

805

775

745

715

690

660

Orange

Alt Cooling or alt Heating

735

700

665

630

595

555

525

490

450

415

Blue

Heating or alt Cooling

695

660

625

590

555

515

480

445

405

370

Red

Alt Cooling. Do not use for heating

540

495

455

410

365

320

280

235

36040E17

Gray

Cooling. Do not use for heating

1180 1140 1100 1055 1010

960

915

860

805

735

Yellow

Alt Cooling. Do not use for heating

880

845

810

780

745

710

675

640

600

570

Blue

Heating or alt Cooling

650

610

560

515

470

435

395

360

325

265

Orange

Alt Cooling. Do not use for heating

525

460

405

350

320

275

210

Red

Alt Cooling. Do not use for heating

515

420

350

310

270

205

36060E14

Gray

Cooling. Do not use for heating

1225 1200 1175 1145 1120 1095 1065 1040 1015

990

Yellow

Alt Cooling. Do not use for heating

1105 1080 1050 1020

990

965

935

905

880

850

Blue

Heating or alt Cooling

940

910

875

845

810

775

745

710

680

645

Orange

Alt Cooling or alt Heating

725

690

650

610

570

530

490

445

405

365

Red

Alt Cooling. Do not use for heating

545

495

445

395

345

295

245

42060E17

Gray

Cooling. Do not use for heating

1475 1445 1405 1370 1330 1290 1255 1215 1175 1140

Yellow

Alt Cooling or alt Heating

1230 1190 1155 1120 1085 1050 1005

970

925

885

Orange

Alt Cooling or alt Heating

1070 1030

990

950

920

875

840

800

755

715

Blue

Heating or alt Cooling

1020

975

940

900

860

820

775

740

690

650

Red

Alt Cooling. Do not use for heating

700

590

535

485

460

390

340

300

275

210

48080E17

Gray

5, 6

Cooling. Do not use for heating

1820 1790 1755 1710 1665 1620 1570 1525 1480 1435

Yellow

Alt Cooling or alt Heating

1455 1420 1380 1345 1310 1275 1240 1205 1170 1135

Blue

Heating or alt Cooling

1335 1295 1260 1220 1185 1150 1110 1075 1040 1005

Orange

Alt Cooling or alt Heating

1110 1065 1020

980

935

895

850

810

770

725

Red

Alt Cooling. Do not use for heating

425

335

240

Summary of Contents for bryant 915SB

Page 1: ...to 140 000 BTUH 53 Table 22 Orifice Size and Manifold Pressure in w c for Gas Input Rate 26 000 BTUH ONLY 54 SERVICE AND MAINTENANCE PROCEDURES 54 WINTERIZATION 61 SEQUENCE OF OPERATION 61 PARTS REPLACEMENT INFORMATION GUIDE 66 MODEL NOMENCLATURE 66 TRAINING 66 Most states in the USA and jurisdictions in Canada have laws that require the use of Carbon Monoxide CO alarms with fuel burning products ...

Page 2: ... exterior of the building at a minimum height of eight 8 feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment The sign shall read in print size no less than one half 1 2 inch in size GAS VENT DIRECTLY BELOW KEEP CLEAR OF ALL OBSTRUCTIONS 4 INSPECTION The state or local gas inspector of the side wall horizontally vent...

Page 3: ...ND CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in dangerous operation personal injury death or property damage Improper installation adjustment alteration service maintenance or use can cause carbon monoxide poisoning explosion fire electrical shock or other conditions which may cause personal injury or property damage Consult a qualified service agency local gas s...

Page 4: ...ble soap solution made specifically for the detection of leaks to check all connections as specified in the Gas Piping section 6 Always install furnace to operate within the furnace s intended temperature rise range with a duct system which has an external static pressure within the allowable range as specified in the Start Up Adjustments and Safety Check section See furnace rating plate 7 When a ...

Page 5: ... fail prematurely customer discomfort and or vent freezing Failure to follow these guidelines is considered faulty installation and or misapplication of the furnace and resulting failure damage or repairs may impact warranty coverage For accessory installation details refer to the applicable instruction literature NOTE Remove all shipping materials loose parts bag and literature before operating t...

Page 6: ...led by a licensed plumber or gas fitter When flexible connectors are used the maximum length shall not exceed 36 in 914 mm When lever type gas shutoffs are used they shall be T handle type The use of copper tubing for gas piping is not approved by the state of Massachusetts Electrical Connections US Current edition of National Electrical Code NEC NFPA 70 CANADA Current edition of Canadian Electric...

Page 7: ...ult in premature furnace component failure Unless otherwise prohibited this gas furnace may be used for heating buildings under construction provided that The furnace is permanently installed with all electrical wiring piping venting and ducting installed according to these installation instructions A return air duct is provided sealed to the furnace casing and terminated outside the space contain...

Page 8: ...nting Systems and Air Supply for Appliances The requirements for combustion and ventilation air depend upon whether or not the furnace is located in a space having a volume of at least 50 cubic feet per 1 000 BTUh input rating for all gas appliances installed in the space Spaces having less than 50 cubic feet per 1 000 BTUh 4 8 cubic meters per kW require the Outdoor Combustion Air Method Spaces h...

Page 9: ...eas of all vent connectors in the space The opening shall commence within 12 in 300 mm of the ceiling Appliances in the space shall have clearances of at least 1 in 25 mm from the sides and back and 6 in 150 mm from the front The opening shall directly communicate with the outdoors or shall communicate through a vertical or horizontal duct to the outdoors or spaces crawl or attic that freely commu...

Page 10: ...In spaces that use the Indoor Combustion Air Method infiltration should be adequate to provide air for combustion permanent ventilation and dilution of flue gases However in buildings with unusually tight construction additional air MUST be provided using the methods described in the Outdoor Combustion Air Method section 4 Unusually tight construction is defined as Construction with a Walls and ce...

Page 11: ...d loosen clamp on vent elbow inlet Remove relief tube from port on collector box Remove the screw that secures the condensate trap to the collector box and remove trap Remove relief tube from relief port on condensate trap Remove front pressure switch tube and discard A new tube is shipped in the Loose Parts bag Remove middle and right plug from collector box DO NOT DISCARD 5 6 Unconverted Factory...

Page 12: ...a Condensate Freeze Protection kit is required The kit includes a condensate trap with heat pad and replaces the factory installed condensate trap Refer to the Accessory section of the Product Data for current kit number A self regulating shielded and waterproof heat tape rated at 3 to 6 watt per foot 10 to 20 watt per meter at 115 volt 40 F 4 C may be used to provide freeze protection of the rema...

Page 13: ...ted from field supplied 1 2 in CPVC or 3 4 in PVC pipe in compliance with local building codes A factory supplied 1 2 in CPVC to 3 4 in PVC adapter is supplied in the loose parts bag for use as required 7 Install the adapter or connect the 1 2 in CPVC pipe by sliding a spring clamp over the open end of the grommet on the outside the furnace casing 8 Open the spring clamp and insert the long end of...

Page 14: ...C pipe into the outlet stub on the drain tube 17 Connect additional condensate piping to a code approved drain or to a condensate pump approved for use with acidic furnace condensate and compatible with mineral and vegetable oils such as canola oil Allow at least 1 4 in per foot 20 mm per meter of slope down and away from the furnace in horizontal sections of drain line TIP FROM CONTRACTORS When i...

Page 15: ...ir duct flanges or air conditioning coil casing when used DO NOT cut main furnace casing side to attach supply air duct humidifier or other accessories All supply side accessories MUST be connected to duct external to furnace main casing A10493 Fig 20 Duct Flanges Return Air Connections The return air duct must be connected to bottom sides left or right or a combination of bottom and side s of mai...

Page 16: ...0 Connect supply air duct to supply air outlet on furnace Bend flange inward past 90 with wide duct pliers See Fig 20 The supply air duct must be connected to ONLY the furnace supply outlet or air conditioning coil casing when used When installed on combustible material supply air duct must be connected to ONLY the factory approved accessory subbase or a factory approved air conditioning coil casi...

Page 17: ...ithout a bottom return air inlet Not all horizontal furnaces are approved for side return air connections See Fig 23 Where required by code seal bottom closure to furnace with tape mastic or other durable sealing method 17 1 2 445 Upflow Applications on Combustible or Noncombustible Flooring Subbase not required 16 406 21 5 8 549 16 5 8 422 22 1 4 565 Downflow Applications on Noncombustible Floori...

Page 18: ...sociated system ductwork See Table 7 for a comparison of Pressure Drop initial clean resistance to airflow versus Airflow for a variety of filter media types and sizes These are representative numbers Consult the filter or IAQ device manufacturers specification sheet for performance data for a particular filter media or IAQ device Design the filter and associated ductwork for the best match of pre...

Page 19: ... 0 11 28 0 17 43 0 27 67 1200 566 0 07 18 0 15 37 0 14 36 0 22 56 1400 661 0 08 21 0 19 48 0 18 45 0 28 70 1600 755 0 09 23 0 24 60 0 21 54 1800 850 0 10 25 0 26 64 20 x 25 Filter 508 x 635 mm Factory Accessory Washable Factory Accessory Media Representative After Market Filter Media Fiberglass Pleated CFM L s 1 in 2 5 cm 4 in 10 cm 1 in 2 5 cm 2 in 5 cm 1 in 2 5 cm 2 in 5 cm 800 378 0 04 11 0 05 ...

Page 20: ...inet Installation Option for 4 Ton or Less A C Capacity 20 or 24 in Media Cabinet Installation with Angled Transition 20 or 24 in Media Cabinet Installation for Combination Side and Bottom Return Media Cabinet Installation Side Return 21 in Furnace up to 5 Ton AC Capacity 24 1 2 in Furnace up to 4 Ton AC Capacity 2 IN 51 mm ROLLOUT PROTECTION REQUIRED Install 12 x 22 305x559 mm sheet metal in fron...

Page 21: ...eld AIR DUCTS General Requirements The duct system should be designed and sized according to accepted national standards such as those published by Air Conditioning Contractors Association ACCA Manual D Sheet Metal and Air Conditioning Contractors National Association SMACNA or American Society of Heating Refrigerating and Air Conditioning Engineers ASHRAE or consult The Air Systems Design Guideli...

Page 22: ... addition of the NFGC in the United States local and national plumbing and gas codes before the furnace has been connected Refer to current edition of NSCNGPIC in Canada After all connections have been made purge lines and check for leakage at furnace prior to operating furnace PRESSURE TESTING ABOVE psig The furnace and it s individual shut off valve must be disconnected from the gas supply pipin...

Page 23: ...in the knockout then insert the gas pipe The grommet is included in the loose parts bag See Fig 30 ELECTRICAL CONNECTIONS See Fig 33 for field wiring diagram showing typical field 115 V wiring Check all factory and field electrical connections for tightness Field supplied wiring shall conform with the limitations of 63_F 35_C rise WARNING FIRE OR EXPLOSION HAZARD A failure to follow this warning c...

Page 24: ... all line voltage wiring options The J Box cover may 115 V FIELD SUPPLIED DISCONNECT AUXILIARY J BOX 24 V TERMINAL BLOCK THREE WIRE HEATING ONLY FIVE WIRE NOTE 1 NOTE 2 FIELD SUPPLIED DISCONNECT CONDENSING UNIT TWO WIRE FURNACE C O N T R O L R G COM W C R G Y GND GND FIELD 24 V WIRING FIELD 115 208 230 460 V WIRING FACTORY 24 V WIRING FACTORY 115 V WIRING 208 230 OR 460 V THREE PHASE 208 230 V SIN...

Page 25: ...J Box bracket and attach both ground wires to the green ground screw 10 Connect any code required external disconnect s to field power wiring NOTE Connect field power and neutral leads to furnace power leads inside the external electrical box as shown in Fig 32 NOTE If electrical entry through the furnace top panel is used mark the screw hole locations using the mounting holes in the external elec...

Page 26: ...peration 2 Humidifier HUM The HUM terminal is a 24 VAC output energized when the gas valve relay is operating during a call for heat Connect an accessory 24 VAC 0 5 amp maximum humidifier if used to the in male quick connect HUM terminal and COM 24V screw terminal on the control board thermostat strip NOTE If the humidifier has its own 24 VAC power supply an isolation relay may be required Connect...

Page 27: ...n instructions for more information VENTING NOTE Planning for the venting system should be done in conjunction with planning for the ductwork drainage and furnace accessories such as air cleaners and humidifiers Begin assembling the venting system AFTER the furnace is set in place in the required orientation Venting for this furnace shall follow all Local codes for Category IV venting systems This...

Page 28: ... ce standard Au Canada l apprêt et le ciment doivent être du même fabricant que le système d évacuation L apprêt GVS 65 Purple et le ciment solvant GVS 65 doivent être utilisé avec les Royal Pipe Système IPEX 636 apprêt PVC CPVC Purple pour évacuation des gaz de combustion et système IPEX 636 1 t ciment PVC pour évacuation des gaz de combustion coté classe IIA 65 deg C doivent être utilisés avec l...

Page 29: ...nd discharges the flue products directly to the outdoors similar to a direct vent system See Fig 43 for references to clearances required by National code authorities All air for combustion is piped directly to the furnace from a space that is well ventilated with outdoor air such as an attic or crawl space and the space is well isolated from the living space or garage Combustion air requirements ...

Page 30: ... 172mm for 2 in 51mm Abandoned masonry used as raceway per code 12 in 305 mm min from overhang or roof Maintain 12 in 305mm minimum clearance above highest anticipated snow level or grade whichever is greater Side wall termination with 2 elbows preferred 12 in min 305 mm from overhang or roof Maintain 12 in 305mm minimum clearance above highest anticipated snow level or grade whichever is greater ...

Page 31: ...echanical air supply inlet 6 ft 1 8 M 3ft 9 M above if within 10 ft 3 M horizontally L Clearance under a veranda porch deck or balcony 12 in 305 mm Permitted only if veranda porch deck or balcony is fully open on a minimum of two sides beneath the floor See Note 4 Manufacturer s Recommendation See Notes 3 8 M Clearance to each side of the centerline extended above or below vent terminal of the fur...

Page 32: ...ommendation See Note 8 K Clearance to a mechanical air supply inlet 6 ft 1 8 M 3ft 9 M above if within 10 ft 3 M horizontally L Clearance under a veranda porch deck or balcony 12 in 305 mm Permitted only if veranda porch deck or balcony is fully open on a minimum of two sides beneath the floor See Note 4 Manufacturer s Recommendation See Notes 3 8 M Clearance to each side of the centerline extende...

Page 33: ... 1 Comply with all clearance requirements stated in Fig 42 or Fig 43 per application 2 The vent termination must be located at least 3 feet from an inside corner and follow the clearance distances in the Inside Corner Termination drawing See Fig 46 3 Termination or termination kit should be positioned where vent vapors will not damage plants shrubs air conditioning equipment or utility meters 4 Do...

Page 34: ...distances when vent termination is located more than 6 ft 2 M away from an inside corner refer to the appropriate Direct Vent or Non Direct Vent Clearance Table Clearance description when termination is at least 3 ft 1 M away and not more than 6 ft 2 M away from an inside corner Clearance above grade veranda porch deck balcony or anticipated snow level 12 in 305 mm Clearance to a permanently close...

Page 35: ...s on unobstructed distances greater than 8 ft 2 4 M All single two pipe and concentric vents may be used providing all other Code and manufacturer s requirements in these instructions are adhered to Refer to the appropriate Vent Termination section above for locating the vent termination If the unobstructed distance from the foundation to the property line of the adjacent lot is no less than 4 ft ...

Page 36: ...e constructed from a running tee of the same diameter of the intake air pipe with EITHER a removable cap attached to a 6 inch long pipe connected to the tee or the External Vent Trap Kit to help prevent contaminants from entering the furnace See Fig 51 The External Vent Trap Kit accessory may be used as a trap for the combustion air inlet pipe if a large amount of moisture must be removed The drai...

Page 37: ...n instructions for details When using metric sized venting systems use these equivalencies for obtaining the proper MEVL from the Tables Use 2 Vent Tables for 60 mm o d vent systems Use 3 Vent Tables for 80 mm o d vent systems Use 4 Vent Tables for 100 mm o d vent systems Unit Size 26 000 2 40 000 1 60 000 2 80 000 100 000 120 000 3 140 000 3 Altitude feet Pipe Dia in 1 2 1 2 2 1 2 2 3 1 2 2 3 4 2...

Page 38: ...total equivalent venting system length See the polypropylene vent system manufacturer s instructions for details 7 Select a diameter of vent pipe from Table 12 and note the Maximum Equivalent Vent Length MEVL shown for that application for that specific furnace input size Compare the Total Equivalent Vent Length TEVL to the MEVL 8 If the Total Equivalent Vent Length is shorter than the Maximum Equ...

Page 39: ...4 Fig 57 A14546 Fig 52 Near Furnace Vent Connections A170006 Fig 53 Inducer Vent Elbow A11309A UPFLOW LEFT CONFIGURATION A11308A UPFLOW RIGHT CONFIGURATION A11310A UPFLOW VERTICAL VENT Fig 54 Upflow Configurations Appearance may vary See Notes for Venting Options A11311A DOWNFLOW LEFT CONFIGURATION WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal inj...

Page 40: ...EFT RIGHT VENT CONFIGURATION Fig 56 Horizontal Left Appearance may vary See Notes for Venting Options A11337 HORIZONTAL RIGHT VERTICAL VENT CONFIGURATION A11336 HORIZONTAL RIGHT LEFT VENT CONFIGURATION 1 2 3 4 5 6 7 5 Rotate vent elbow to required position Any other unused knockout may be used for combustion air connection Requires Accessory Internal Vent Kit See Product Data for current kit numbe...

Page 41: ...ize 40 000 BTUH 60 000 BTUH Uninsulated 3 8 in Insulation 1 2 in Insulation Uninsulated 3 8 in Insulation 1 2 in Insulation Pipe Dia in 1 2 2 1 2 2 1 2 2 1 2 2 3 1 2 2 3 1 2 2 3 20 20 20 20 20 50 45 20 60 50 20 30 30 25 20 75 65 60 20 85 75 65 0 10 5 5 20 25 20 20 30 25 15 15 10 10 20 40 30 25 20 45 40 30 20 5 20 15 10 20 20 15 10 5 20 25 20 15 20 30 25 20 Unit Size 80 000 BTUH Winter Design Temp ...

Page 42: ...102 7 4 6 12 2 12 2 10 7 9 1 4 6 15 2 27 4 22 9 19 8 4 6 15 2 21 3 21 3 21 3 18 4 6 6 1 4 6 3 0 1 5 4 6 15 2 13 7 10 7 9 1 4 6 15 2 15 2 12 2 10 7 29 4 6 3 0 1 5 4 6 10 7 9 1 6 1 4 6 4 6 12 2 9 1 7 6 4 6 40 3 0 1 5 4 6 7 6 6 1 4 6 1 5 4 6 9 1 7 6 6 1 3 0 Winter Design Temp C Unit Size 100 000 BTUH Uninsulated 3 8 in Insulation 1 2 in Insulation Pipe Dia mm 51 64 76 102 51 64 76 102 51 64 76 102 7 ...

Page 43: ...h 1 4 in turn Be sure pipe is fully inserted into fitting socket 15 Wipe excess cement from joint A continuous bead of cement will be visible around perimeter of a properly made joint 16 Handle pipe joints carefully until cement sets 17 Horizontal portions of the venting system shall be supported to prevent sagging Space combustion air piping and vent piping hangers as shown in Table 15 Support pi...

Page 44: ...reference only Cut one 4 in 102 mm diameter hole for 2 in 50 mm ND kit or one 5 in 127 mm diameter hole for 3 in 80 mm ND kit in the desired location Loosely assemble concentric vent combustion air termination components together using instructions in kit Slide assembled kit with rain shield REMOVED through hole in wall or roof flashing NOTE Do not allow insulation or other materials to accumulate...

Page 45: ...ow clamp 15 lb in Table 16 Approved Combustion Air and Vent Pipe Fitting and Cement Materials NOTICE RECOMMENDED SUPPORT FOR VENT TERMINATIONS It is recommended that sidewall vent terminations in excess of 24 inches 0 6 M in vertical length be supported by EITHER the Direct Vent Termination Kit shown in Table 11 or by field supplied brackets or supports fastened to the structure MATERIALS USA 1 Al...

Page 46: ...here 70 ft 22 M Use length of the longer of the vent or air inlet piping system Add equiv length of 3 90º long radius elbows use the highest number of elbows for either the vent or inlet pipe 3 x 3 ft 0 9 M 9 ft 2 7 M From Table 13 Add equiv length of 2 45º long radius elbows use the highest number of elbows for either the vent or inlet pipe 2 x 1 5 ft 0 5 M 3 ft 0 9 M From Table 13 Add equiv leng...

Page 47: ...ons have been made and check for leaks NOTICE IMPORTANT INSTALLATION AND START UP PROCEDURES Failure to follow this procedure may result in a nuisance smoke or odor complaint The manifold pressure gas rate by meter clocking temperature rise and operation must be checked after installation Minor smoke and odor may be present temporarily after start up from the manufacturing process Some occupants a...

Page 48: ...m out gas valve regulator adjusting screw This can result in unregulated manifold pressure and result in excess overfire and heat exchanger failures CAUTION FURNACE DAMAGE HAZARD Failure to follow this caution may result in reduced furnace life The 26 000 BTUH model has a lower nominal manifold pressure than other models Do not adjust the natural gas manifold pressure above 1 8 in W C The 26 000 B...

Page 49: ...ified by the green label affixed to the top of the gas valve For all other models see Table 21 1 Adjust manifold pressure to obtain proper gas input rate See Fig 63 a Refer to the correct manifold pressure table for the appropriate model b Turn gas valve ON OFF switch to OFF c Loosen set screw on manifold tower pressure tap no more than one full turn with a 3 32 in hex wrench or remove the 1 8 inc...

Page 50: ...rise by adjusting blower speed Reference Table 20 Air Delivery for available heating airflow ranges NOTICE For 40 000 BTUH models through 120 000 BTUH models DO NOT set manifold pressure less than 2 8 in w c 697 Pa or more than 3 8 in w c 947 Pa for natural gas If required manifold pressure is outside this range change main burner orifices to obtain manifold pressure in this range Table 18 Gas Rat...

Page 51: ...ange or slightly above PINS 1 AND 2 2 AND 3 3 AND 4 4 AND 5 Time in sec 90 120 150 180 Table 20 Air Delivery CFM With Filter UNIT SIZE WIRE LEAD COLOR SPEED TAPS 2 3 Function EXTERNAL STATIC PRESSURE IN W C 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 0 30026E14 Black Cooling Do not use for heating 1045 1010 975 935 895 855 810 760 715 670 Yellow Alt Cooling or alt Heating 820 770 730 680 630 585 530 480...

Page 52: ...nals when furnace is in low heat and after blower starts 4 Set heat anticipator on thermostat per thermostat instructions and install on subbase or wall 5 Install blower access door Electronic thermostat Set cycle rate for 3 cycles per hr 60080E21 Gray 5 6 Cooling Do not use for heating 2045 1995 1950 1900 1855 1805 1760 1710 1660 1615 Yellow Alt Cooling Do not use for heating 1665 1625 1575 1530 ...

Page 53: ...T VALUE 0 58 0 60 0 62 0 64 AT ALTITUDE Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Btu cu ft No Pressure No Pressure No Pressure No Pressure 900 43 3 8 42 3 2 42 3 3 42 3 4 0 925 43 3 6 43 3 7 43 3 8 42 3 2 0 950 43 3 4 43 3 5 43 3 6 43 3 7 975 44 3 7 44 3 8 43 3 4 43 3 6 to 1000 44 3 5 44 3 6 44 3 8 43 3 4 1025 44 3 3 44 3 5 44 3 6 44 3 7 2000 1050 44 3 2 44 3 3 44 3 4 44...

Page 54: ...43 1 7 43 1 7 1525 775 44 1 7 44 1 7 44 1 8 44 1 8 800 44 1 6 44 1 6 44 1 7 44 1 7 825 44 1 5 44 1 5 44 1 6 44 1 6 850 44 1 4 44 1 4 44 1 5 44 1 5 6000 875 44 1 3 44 1 3 44 1 4 44 1 4 1829 900 44 1 2 44 1 3 44 1 3 44 1 4 675 43 1 8 43 1 8 42 1 5 42 1 6 6001 700 43 1 6 43 1 7 43 1 7 43 1 8 1830 725 44 1 7 44 1 8 43 1 6 43 1 7 750 44 1 6 44 1 7 44 1 7 44 1 8 775 44 1 5 44 1 6 44 1 6 44 1 7 7000 800 ...

Page 55: ...terpret the LED 6 A component test sequence will follow 7 Reinstall the Main Control door Component Self Test NOTE The furnace control component test allows all components to run for a short time except the gas valve and humidifier terminal HUM are not energized The EAC 1 terminal is energized when the blower is energized This feature helps diagnose a system problem in case of a component failure ...

Page 56: ...Turn on electrical supply to furnace Blower Motor and Wheel Maintenance WARNING FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury death and or property damage Never store flammable or combustible materials on near or in contact with the furnace such as 1 Spray or aerosol cans rags brooms dust mops vacuum cleaners or other cleaning tools 2 Soap powders bleaches...

Page 57: ... attachment Be careful not to disturb balance weights clips on blower wheel vanes Do not bend wheel or blades as balance will be affected 7 If greasy residue is present on blower wheel remove wheel from the blower housing and wash it with an appropriate degreaser To remove wheel NOTE The DIBC composite wheel used in some models should be cleaned with mild soapy water only Allow wheel to dry prior ...

Page 58: ...casing 6 Remove individual wires from terminals on gas valve 7 Disconnect Hot Surface Igniter HSI wires from HSI 8 Disconnect Flame Sensor wire from Flame Sensor 9 Support the manifold and remove the 4 screws that secure the manifold assembly to the burner assembly and set aside Note the location of the green yellow wire and ground terminal 10 Inspect the orifices in the manifold assembly for bloc...

Page 59: ...cal supplies to furnace 2 Remove control door 3 Disconnect pressure switch tube from pressure switch port NOTE Ensure the pressure switch tube disconnected from the pressure switch is higher than the collector box opening or water will flow out of tube 4 Remove the collector box plug from the top port on the upper corner of the collector box See Fig 60 5 Attach a funnel with a flexible tube to por...

Page 60: ...discolored insulation is evident replace heat tape 3 Check that heat tape power supply circuit is on Cleaning Heat Exchangers The following items must be performed by a qualified service technician Primary Heat Exchangers If the heat exchangers get an accumulation of light dirt or dust on the inside they may be cleaned by the following procedure NOTE If the heat exchangers get a heavy accumulation...

Page 61: ...ower motor BLWM hot surface igniter HSI and gas valve GV 1 Heating See Fig 38 and Fig 39 for thermostat connections The wall thermostat calls for heat closing the R to W circuit The furnace control performs a self check verifies the pressure switch contacts LPS and HPS are open and starts the inducer motor IDM a Inducer Prepurge Period As the inducer motor IDM comes up to speed the collector box p...

Page 62: ...ill stop and the furnace blower motor BLWM will continue operating on the COOL speed for an additional 90 sec 3 Continuous Blower Mode When the R to G circuit is closed by the thermostat the blower motor BLWM will operate on continuous blower speed FAN speed Terminal EAC 1 is energized as long as the blower motor BLWM is energized During a call for heat the blower BLWM will stop during igniter war...

Page 63: ...rily shorting the TEST TWIN terminal to Com24V terminal until the LED goes out LED will flash the status code of the previous fault or status code 11 1 short and 1 long flash if there was no previous fault After the control repeats the code 4 times the control will go through a brief component test sequence The inducer will start and run for the entire component test The HSI blower motor FAN speed...

Page 64: ...e trial for ignition 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 s...

Page 65: ...rt up Operating and Service and Maintenance Instructions Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 65 344442 2 Rev D A210134 Fig 73 Wiring Diagram ...

Page 66: ...icensed Heating and Air Conditioning company of your choice BRYANT HEATING COOLING SYSTEMS a division of Carrier Corporation 7310 West Morris Street Indianapolis IN 46231 U S A Have available the model number series number and serial number located on the unit rating plate to ensure correct replacement part MODEL NOMENCLATURE TRAINING My Learning Center is your central location for professional re...

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