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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.

Example

: Nominal break point on pressure switch is 0.68-in. W.C. The

minimum break point of the switch is 0.63-in. W.C. The maximum break

point of the switch is 0.73-in. W.C. The maximum make point of the

switch is 0.83-in. W.C.

The electrical ground and polarity for 115-v wiring must be properly

maintained. Refer to

Fig. 33

for field wiring information and to

Fig. 73

for furnace wiring information.

NOTE:

If the polarity is not correct, the STATUS LED on the control

will flashes rapidly and prevent the furnace from heating. The control

system also requires an earth ground for proper operation of the control

and flame-sensing electrode.
The 24-v circuit contains an automotive-type, 3-amp. fuse located on the

control. See

Fig. 38

. Any shorts of the 24-v wiring during installation,

service, or maintenance will cause this fuse to blow. If fuse replacement

is required, use ONLY a 3-amp. fuse. The control LED will display

status code 24 when fuse needs to be replaced.

Troubleshooting

Refer to the service label. See

Fig. 71

The Troubleshooting Guide can be a useful tool in isolating furnace

operation problems. Beginning with the word “Start,” answer each

question and follow the appropriate arrow to the next item. See

Fig. 72

The Guide will help to identify the problem or failed component. After

replacing any component, verify correct operation sequence.
Proper instrumentation is required to service electrical controls. The

control in this furnace is equipped with a Status Code LED

(Light-Emitting Diode) to aid in installation, servicing, and

troubleshooting. Status codes can be viewed at the indicator in blower

door. The amber furnace control LED is either ON continuously, rapid

flashing, or a code composed of 2 digits. The first digit is the number of

short flashes, the second digit is the number of long flashes.
For an explanation of status codes, refer to service label located on

control door or

Fig. 71

, and the troubleshooting guide which can be

obtained from your distributor.

Retrieving Stored Fault Codes

NOTE:

Fault codes cannot be retrieved if a thermostat signal (24-v on

W, Y, G, etc.) is present, or if any delays such as blower off-delays are

active.
The stored status codes will NOT be erased from the control memory

when 115- or 24-v power is interrupted. See the Service Label (

Fig. 71

)

for more information. The most recent fault code may be retrieved as

follows:

1. Leave 115-v power connected to furnace.
2. Observe the status LED through the blower door (the lower door on

upflow applications) indicator. Refer to the Service Label (

Fig. 71

)

to interpret the LED.

3. Remove the Main/Control door (the upper door on upflow

installations).

4. BRIEFLY disconnect and reconnect ONE of the main limit wires.
5. The LED will flash the last stored fault code. Refer to the Service

Label (

Fig. 71

) to interpret 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. The component test feature will not operate if any

thermostat signal is present at the control and not until all time delays are

completed.
To Begin Component Self-Test:

1. Remove blower access door.
2. Disconnect the thermostat R lead from furnace control.
3. Manually close blower door switch.

Caution must be taken when manually closing this switch for service

purposes.

4. For approximately 2 sec, short (jumper) the COM-24v terminal on

control to the TEST/TWIN 3/16—in. (5 mm) quick-connect

terminal on control until the LED goes off. Remove jumper from

terminals. See

Fig. 38

NOTE:

If TEST/TWIN and COM-24v terminals are jumpered longer

than 2 sec, LED will flashes rapidly and ignore component test request.
Component test sequence is as follows:

a. LED will display previous status code 4 times.

b. Inducer motor starts and continues to run until Step g of

component test sequence.

c. After 7 sec the hot surface igniter is energized for 15 sec., then

off.

d. Blower motor operates on Continuous-FAN speed for 10 sec.

e. Blower motor operates on HEAT speed for 10 sec.

f. Blower motor operates on COOL speed for 10 sec.

g. Inducer motor stops.

5. Reconnect R lead to furnace control, remove tape from blower door

switch, and re-install blower door.

6. Verify furnace shut down by lowering thermostat setting below

room temperature.

7. Verify that furnace restarts by raising thermostat setting above room

temperature.

Checklist

1. Put away tools and instruments. Clean up debris.
2. Verify that the jumper is removed from the TEST/TWIN terminal.

Verify that there is nothing plugged into the PLT connector. (If there

is a jumper connector plugged into PLT, remove it and discard.) See

Fig. 38

3. Verify that the Blower/Heat Off Delay jumpers are set as desired.

See

Fig. 38

4. Verify that the blower and control (“Main”) doors are properly

installed.

5. Verify that the Status LED glows. If not, check that the power

supply is energized and that the blower door is secure. See

Fig. 71

6. Cycle test furnace with room thermostat to be sure that it operates

properly with the room thermostat. Check all modes including

Heat, Cool and Fan.

WARNING

ELECTRICAL SHOCK HAZARD

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

There may be more than one electrical supply to the furnace. Check

accessories and cooling unit for additional electrical supplies that must

be shut off during furnace servicing. Lock out and tag switch with a

suitable warning label.

WARNING

ELECTRICAL SHOCK HAZARD

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

Blower door switch opens 115-v power to furnace control. No

component operation can occur unless switch is closed. Exercise

caution to avoid electrical shock from exposed electrical components

when manually closing this switch for service purposes.

Содержание bryant 915SB

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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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Carrier bryant 915SB, Инструкции по установке, запуску, эксплуатации, обслуживанию и техническому обслуживанию

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