Carrier 59MN7B Installation, Start-Up, Operating And Service And Maintenance Instructions
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Carrier 59MN7B Installation, Start-Up, Operating And Service And Maintenance Instructions

Modulating 4-way multipoise condensing gas furnace
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59MN7B
Modulating 4---Way Multipoise
Condensing Gas Furnace
Installation, Start---up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the installation.
SECTIONS
INTRODUCTION
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ACCESSORIES
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LOCATION
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INSTALLATION
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PARTS REPLACEMENT GUIDE
Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1E, 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.
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Use of the AHRI Certified TM Mark indicates a
manufacturer's participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .
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Loose Parts Bag Contents
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Filter Size Information
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Opening Dimensions
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Air Delivery CFM
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Hangar Spacing
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Combustion- -Air Vent Pipe, Fitting & Cement Material..
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Deductions from Maximum Equivalent Vent Length
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TABLES
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  • Page 1: Table Of Contents

    59MN7B Modulating 4---Way Multipoise Condensing Gas Furnace Installation, Start---up, Operating and Service and Maintenance Instructions NOTE: Read the entire instruction manual before starting the installation. SECTIONS TABLES SAFETY CONSIDERATIONS ......
  • Page 2 Required Notice for Massachusetts Installations IMPORTANT The Commonwealth of Massachusetts requires compliance with regulation 248 CMR as follows: 5.08: Modifications to NFPA- -54, Chapter 10 2) Revise 10.8.3 by adding the following additional requirements: a. For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:...

  • Page 3: Safety Considerations

    SAFETY CONSIDERATIONS when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing. WARNING Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should install, repair, or service heating equipment. FIRE, EXPLOSION, ELECTRICAL SHOCK, AND Untrained personnel can perform basic maintenance functions CARBON MONOXIDE POISONING HAZARD...
  • Page 4 duct(s) sealed to the furnace casing and terminating outside 13. These furnaces SHALL NOT be installed directly on car- the space containing the furnace. See “Air Ducts” section. peting, combustible tile, or any other combustible material other than wood flooring. In downflow installations, fact- 8.

  • Page 5: Codes And Standards

    / 27˚C SUPPLY AIR / 16˚C SEE PRODUCT DATA FOR ACCESSORY CONDENSATE TRAP HEATER AND CONDENSATE DRAIN LINE PROTECTION. A150573 Fig. 2 - - Freeze Protection and Return Air Temperature CODES AND STANDARDS 5, 6, 7, and 8 and national plumbing codes. CANADA: Current edition of CAN/CSA- -B149.1, Parts 4, 5, 6, Follow all national and local codes and standards in addition and 9.

  • Page 6: Minimum Clearances To Combustible Materials

    LOCATION 1. Disconnect all power to the furnace. Multiple disconnects may be required. DO NOT TOUCH THE CONTROL CAUTION OR ANY WIRE CONNECTED TO THE CONTROL PRIOR DISCHARGING YOUR BODY’S ELECTROSTATIC CHARGE TO GROUND. PERSONAL INJURY AND/OR PROPERTY 2. Firmly touch the clean, unpainted, metal surface of the fur- DAMAGE HAZARD nace chassis which is close to the control.
  • Page 7 WARNING CARBON MONOXIDE POISONING / COMPONENT DAMAGE HAZARD Failure to follow this warning could result in personal injury or death and unit component damage. Corrosive or contaminated air may cause failure of parts containing flue gas, which could leak into the living space. Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide.
  • Page 8 A180203 SHIP WT. FURNACE SIZE BOTTOM CABINET WIDTH OUTLET WIDTH AIR INTAKE LB (KG) INLET WIDTH 060C17--- 14 17--- 1/2 (445) 15--- 7/8 (403) 16 (406) 8--- 3/4 (222) 147.5 (66.9) 060C21--- 20 21 (533) 19--- 3/8 (492) 19--- 1/2 (495) 10--- 1/2 (267) 165.5 (75.1) 080C17--- 14...

  • Page 9: Air For Combustion And Ventilation

    AIR FOR COMBUSTION AND Outdoor Combustion Air Method VENTILATION 1. Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent hori- Introduction zontal or vertical duct(s) or opening(s) directly communic- Direct Vent (2- - pipe) Applications ating with the outdoors or spaces that freely communicate with the outdoors.

  • Page 10: Condensate Trap

    Table 3 – Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors TWO OPENINGS OR TWO HORIZONTAL DUCTS SINGLE DUCT OR OPENING VERTICAL DUCTS (1 SQ. IN./2,000 BTUH) (1 SQ. IN./3,000 BTUH) FURNACE (1 SQ. IN./4,000 BTUH) (1,100 SQ.
  • Page 11 To Relocate the Condensate Trap: collector box for proper condensate drainage. See the bottom images in Fig. 10 and 11. S Remove the knockout in the casing for the condensate trap. A field- -supplied, accessory Horizontal Installation kit (trap S Install the grommet in the casing when required for direct- -vent grommet) is required for all direct- -vent horizontal installations horizontal applications.
  • Page 12 Remove pressure switch tube from pressure switch port. Remove relief tube from relief port on condensate trap. Remove tube from Remove trap from relief port. collector box. Loosen clamp on inlet Remove middle and bottom plugs. to vent elbow. DO NOT DISCARD. Trim excess tube.
  • Page 13 Remove plug from collector box. DO NOT DISCARD. If alternate vent position is required, loosen clamp on inlet of vent elbow. Remove trap from collector box. Unconverted Factory Trap Configuration As Viewed in the Horizontal Right Orientation Slide relief tube in stand-offs to adjust length.
  • Page 14 Remove trap from collector box. If alternate vent position is required, loosen clamp Remove relief tube on vent elbow inlet. from relief port on condensate trap. Remove pressure switch tube from port on collector box. Remove relief tube from port on collector box.

  • Page 15: Condensate Drain Connection

    CONDENSATE DRAIN CONNECTION b. There is an air gap at the point where the two drain lines meet or CAUTION c. All condensate piping is at least 3/4-in. PVC and there is a relief tee at the top of condensate drain piping as shown in Fig.
  • Page 16 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: Contractors have found that temporarily removing the inducer assembly in upflow applications while performing the steps, below, makes upflow left- -side drain connections easier.
  • Page 17 16. Open the spring clamp and insert the long end of the 7. The remaining drain line can be constructed from field- - adapter or the 1/2- -in. CPVC pipe into the outlet stub on the supplied 1/2- -in. CPVC or 3/4- -in. PVC pipe, in drain tube.
  • Page 18 Evaporator Coil + + + + = Positive pressure < + = Pressure lower than areas with + − = Negative pressure Condensing Furnace Blower creates positive pressure. Positive pressure extends into coil condensate drain (no trap). < + < + <...
  • Page 19 Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Evaporator Coil + + + Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä 3/4” PVC Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä Ä...
  • Page 20 Upflow Installation Connect supply- -air duct to flanges on furnace supply- -air outlet. Bend flange upward to 90_ with wide duct pliers. See Fig. 19. NOTE: The furnace must be pitched as shown in Fig. 18 for The supply- -air duct must be connected to ONLY the furnace proper condensate drainage.
  • Page 21 Return Air Connections NOTE: Bottom closure must be used when leveling legs are used. It may be necessary to remove and reinstall bottom flash to install WARNING leveling legs. To remove bottom closure panel, see Fig. 20 or 21. To install leveling legs: 1.
  • Page 22 Return Air Connections WARNING HORIZONTAL TOP FIRE HAZARD RETURN NOT PERMITTED FOR ANY MODEL A failure to follow this warning could cause personal injury, death and/or property damage. Never connect return- -air ducts to the back of the furnace. Follow instructions below. The return- -air duct must be connected to return- -air opening (bottom inlet).
  • Page 23 Roll- - Out Protection mm) Media Cabinet is shipped with the 14- -3/16-in. (360 mm) furnace and includes block-off plates. Provide a minimum 12- -in. x 22- -in. (305 x 559 mm) piece of For upflow side return applications, the Media Cabinet (or field sheet metal for flame roll- -out protection in front of burner area for supplied accessory air cleaner) can be installed on the side of the furnaces closer than 12- -in.
  • Page 24 Table 5 – Filter Information Filter Media Pressure Drop (Clean) Versus Airflow - - In. W.C. (Pa) Representative After-Market Filter Media* 14 x 25 Filter Factory-Accessory Factory-Accessory (356 x 635 mm) Washable Media* Fiberglass* Pleated* (1-in. / 2.5 cm) (4-in. / 10 cm) (1-in.
  • Page 25 Air Filter Located in Filter Cabinet FILTER CABINET HEIGHT --- IN (MM) FILTER SIZE --- IN (MM) FILTER TYPE (1) 16 x 25 x 3/4* (406 x 635 x 19) or 16 (406) Washable or Media* (1) 16 x 25 x 4--- 5/16 (406 x 635 x 110) (1) 20 x 25 x 3/4* (508 x 635 x 19) or...
  • Page 26 FURNACE FURNACE (OR COIL CASING WHEN USED) APPROVED COIL ASSEMBLY COIL BOX COMBUSTIBLE COMBUSTIBLE FLOORING FLOORING PLENUM OPENING DOWNFLOW SUBBASE SHEET METAL PLENUM FLOOR SHEET METAL PLENUM OPENING FLOOR FLOOR OPENING OPENING A10491 Fig. 27 - - Installation on Combustible Flooring Table 6 –...
  • Page 27 COMBUSTION - AIR PIPE (SEE VENTING SECTION) 30 IN. (762 mm) MIN. WORK AREA 2-IN. (51 mm) ROLLOUT PROTECTION REQUIRED Install 12” x 22” (305x559 mm) sheet metal in front of burner compartment area. The sheet metal MUST extend underneath the furnace casing by 1-in. (25 mm) with the door removed.

  • Page 28: Air Ducts

    AIR DUCTS NOTE: Flexible connections should be used between ductwork and furnace to prevent transmission of vibration. NOTICE Ductwork passing through unconditioned space should be insulated to enhance system performance. When air conditioning is used, a vapor barrier is recommended. Many states, provinces and localities are considering or have Maintain a 1- -in.
  • Page 29 Table 7 – Cooling and Heating Air Delivery - - CFM (Bottom Return With Filter) (SW1-5 and SW4-3 set to OFF, except as indicated. See notes 1 and 2.) Unit Size: 060C17-14 Clg/CF Switch settings External Static Pressure (ESP) Clg Switches SW2-3 SW2-2 SW2-1...
  • Page 30 Cooling and Heating Air Delivery - - CFM (Bottom Return With Filter) continued (SW1-5 and SW4-3 set to OFF, except as indicated. See notes 1 and 2.) Unit Size: 080C17-14 Clg/CF Switch settings External Static Pressure (ESP) Clg Switches SW2-3 SW2-2 SW2-1 Clg Default:...
  • Page 31 Cooling and Heating Air Delivery - - CFM (Bottom Return With Filter) continued (SW1-5 and SW4-3 set to OFF, except as indicated. See notes 1 and 2.) Unit Size: 100C21-22 Clg/CF Switch settings External Static Pressure (ESP) Clg Switches SW2-3 SW2-2 SW2-1 Clg Default:...

  • Page 32: Gas Piping

    GAS PIPING Refer to Table 8 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 minimum of one WARNING hanger every 6 ft. (2 M). Joint compound (pipe dope) should be applied sparingly and only to male threads of joints.

  • Page 33: Electrical Connections

    Left Side Gas Entry. Gas Pipe Gas Pipe Grommet Required Grommet Required For Direct For Direct Vent Applications Vent Applications. SUPPLY FRONT MANUAL SHUT OFF VALVE (REQUIRED) NOTE: Union may be inside the UNION vestibule where permitted by SEDIMENT local codes. TRAP A11338 Fig.

  • Page 34: Electrical Data

    See Fig. 33 for field wiring diagram showing typical field 115- -v WARNING wiring. Check all factory and field electrical connections for tightness. ELECTRICAL SHOCK HAZARD Field- -supplied wiring shall conform with the limitations of 63_F (33_C) rise. Failure to follow this warning could result in personal injury or death.
  • Page 35 WARNING ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in personal injury, death, or property damage. The cabinet MUST have an uninterrupted or unbroken ground according to NEC NFPA 70- -2011 or local codes to minimize personal injury if an electrical fault should occur. In Canada, refer to Canadian Electrical Code CSA C22.1.
  • Page 36 For a side- -mounted external electrical box, complete the The J- -Box cover, mounting bracket and screws are shipped in the loose parts bag included with the furnace. See Fig. 34 for J- -Box following: mounting locations. 1. Align the J- -Box bracket with the knock- -out inside the The J- -Box mounting bracket and green ground screw is used as a furnace casing.
  • Page 37 5. Connect field ground wire and factory ground wire to green used to control the staging. However, full modulating capability ground screw on J- -Box mounting bracket as shown in Fig. will not be available when the furnace staging is controlled by the thermostat.
  • Page 38 COMMUNICATION CONTINUOUS FAN OUTDOOR SW4 SETUP CONNECTOR (CF) AIRFLOW AIR TEMP SWITCHES SETUP SWITCHES CONNECTOR MODEL PLUG PL8 - MODULATING CONNECTOR GAS VALVE CONNECTOR SW1 SETUP SWITCHES AND BLOWER OFF- DELAY AIR CONDITIONING (A/C) AIRFLOW SETUP SWITCHES HUMIDIFIER TERMINAL (24-VAC 0.5 AMP MAX.
  • Page 39 THERMOSTAT THERMOSTAT See notes 2, 5, 7, 10, 11, 16, and 17 See notes 1, 2, 4, 6, 7, 9, 10, 11, 15, 16, and 17 Modulating and 2-Stage Furnace with Single-Speed Heat Pump Modulating and 2-Stage Furnace with Single-Speed Air Conditioner THERMOSTAT THERMOSTAT See notes 1, 2, 3, 4, 6, 8, 9, 10, 12, 13, 15, 16, and 17...
  • Page 40 NOTES FOR THERMOSTAT WIRING DIAGRAMS 1. Heat pump MUST have a high pressure switch for HYBRID HEATr dual fuel applications. 2. Refer to outdoor equipment Installation Instructions for additional information and setup procedure. 3. If the heat pump date code is 1501E or earlier, select the “ZONE” position on the two speed heat pump control. Heat pumps with date code 1601E and later do not have or require a “ZONE”...
  • Page 41 haut mentionnées. Le standard Canadien recommande l’ of National Fuel Gas Code NFPA 54/ANSI Z- -223.1. In Canada, refer to CAN/CSA- -B149.1. inspection par un personel qualifié et ce, une fois par année. Les autoritées ayant juridiction (inspecteurs de gas, inspecteurs en An abandoned masonry chimney may be used as a raceway for bâtiments, département des incendies, etc) devraient être properly...

  • Page 42: Vent Termination Kit For Direct Vent (2- -Pipe) Systems

    NOTICE RECOMMENDED SUPPORT FOR VENT TERMINATION It is recommended that sidewall vent terminations of over 24 inches (0.6 M) in length or rooftop vent terminations of over 36 inches (1 M) in length be supported by EITHER the factory accessory vent termination kit or field- -supplied brackets or supports attached to the structure.
  • Page 43 Locating the Vent Termination 2. The vent termination must be located at least 3 feet from an inside corner and follow the clearance distances in the In- General side Corner Termination drawing. NOTE: Termination Requirements for the Provinces of 3. The clearance distances apply when the vent is at least 3 Alberta and Saskatchewan are located at the end of this feet (1 meter) from, but not more than 6 feet (2 meters) away from an inside corner.
  • Page 44 If the unobstructed distance from the foundation to the property line of the adjacent lot is no less than 4 ft. (1.2 M) and no greater than 8 ft. (2.4 M), it will be necessary to re-direct the flue gas plume.
  • Page 45 TO CODE- - APPROVED DRAIN OR CONDENSATE PUMP Recommend “T” fitting with 4--inch minimum height standpipe (A) of same diameter or larger extending upward. Dry Well Dry Well (water tight Dry Well and removable) (water tight (water tight and removable) and removable) Representative drawing only, some models may vary in appearance.

  • Page 46: Maximum Equivalent Vent Length

    4. If a Tee is used on the termination (Alberta and EXAMPLE FOR UPFLOW INSTALLATIONS. Saskatchewan, when required) record the equivalent length MAY BE APPLIED TO of the Tee used. OTHER CONFIGURATIONS. 5. Calculate Total Equivalent Vent Length by adding the equivalent lengths of the fittings to the lengths of the indi- vidual vent and combustion air pipes.
  • Page 47 NOTE: Pipe length (ft. / M) specified for maximum pipe lengths vent pipe are difficult to pitch correctly and may trap water in the vent pipe. See Fig. 42. located in unconditioned spaces cannot exceed total allowable pipe length as calculated from Table 14. Trapped water in the vent pipe may result in nuisance pressure switch tripping.
  • Page 48 Installing the Vent Pipe Adapter and Combustion Air WARNING Pipe Adapter WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury or death. CARBON MONOXIDE POISONING HAZARD DO NOT use cement to join polypropylene venting systems. Failure to follow this warning could result in personal Follow the polypropylene venting system manufacturer’s injury or death.
  • Page 49 end of pipe and fitting socket (over primer). Apply cement 18. Complete the vent and combustion air pipe installation by in a light, uniform coat on inside of socket to prevent connecting the concentric vent or by installing the required buildup of excess cement.
  • Page 50 ALIGN NOTCHES IN VENT PIPE VENT PIPE ADAPTER WITH GASKET COUPLING OVER STAND-OFF INSTALLED ON FURNACE VENT ON ADAPTER. TORQUE LOWER PIPE IS CUT FLUSH WITH TOP OF CLAMP 15 LB-IN. WHEN REMAINING ADAPTER. PRIME AND CEMENT VENT VENT PIPE IS INSTALLED, TORQUE PIPE TO ADAPTER.
  • Page 51 2- - Pipe (Direct Vent) and 1- - Pipe (Ventilated Combus- Disassemble loose pipe fittings. Clean and cement using same procedures as used for system piping. DO NOT CEMENT tion Air) Vent Termination POLYPROPYLENE FITTINGS. NOTE: Follow the instructions of the vent terminal manufacturer. Two- -Pipe (Direct Vent) and Single- -Pipe (Ventilated These instructions are provided as a reference, only.
  • Page 52 Table 12 – Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (U.S.A. Installations) MATERIALS 1. All pipe, fittings, primers*, and solvents* must conform to American National Standards Institute (ANSI) standards and American Society for Testing and Materials (ASTM) standards or ULC S636 where required by code. 2.

  • Page 53: Maximum Allowable Exposed Vent Lengths Insulation

    Table 13 – Maximum Allowable Exposed Vent Lengths Insulation Table Maximum Allowable Exposed Vent Length in Unconditioned Space - - Ft. 40,000* BTUH 60,000 BTUH Unit Size Uninsulated Uninsulated 3/8-in. Insulation 1/2-in. Insulation 3/8-in. Insulation 1/2-in. Insulation Pipe Dia. 1 ½ 2 ½...
  • Page 54 NOTE: Maximum Equivalent Vent Length (MEVL) includes standard and concentric vent termination and does NOT include elbows. Use Table 15 - Deductions from Maximum Equivalent Vent Length to determine allowable vent length for each application. Table 14 – Maximum Equivalent Vent Length - - Ft. Unit Size 60,000 80,000...

  • Page 55: Venting

    Venting System Length Calculations The Total Equivalent Vent Length (TEVL) for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent length of elbows used in the venting system from Table 15. Standard vent terminations or factory accessory concentric vent terminations count for zero deduction. See vent system manufacturer’s data for equivalent lengths of flexible vent pipe or other termination systems.
  • Page 56 A190032 Fig. 46 --- Inside Corner Termination Inside Corner Terminations Inside corner vent terminations are permitted provided that: S Only two exterior walls come together to form an angle of 90 degrees to 135 degrees. There are no other exterior walls attached to either wall to form an alcove.
  • Page 57 Rotate vent elbow to required position. Any other unused knockout may be used for combustion air connection. Rotate vent elbow to required position. & UPFLOW LEFT CONFIGURATION A11309A DOWNFLOW LEFT CONFIGURATION A11311A Rotate vent elbow to required position. Any other unused knockout may be used Any other unused for combustion air...
  • Page 58 ALTERNATE COMBUSTION AIR CONNECTIONS HORIZONTAL RIGHT ---VERTICAL VENT CONFIGURATION A11337 HORIZONTAL LEFT ---VERTICAL VENT CONFIGURATION A11327A Alternate combustion air connection. Rotate vent elbow to required position. Vent Pipe Requires Internal Vent Kit See Product Data for Current Kit Number HORIZONTAL RIGHT ---LEFT VENT CONFIGURATION HORIZONAL LEFT ---LEFT VENT CONFIGURATION A11336 A11328A...
  • Page 59 A12326 NOTE: The following is based upon National codes for gas appliances and is provided as a reference. Refer to local codes which may supersede these standards and/or recommendations. (1 ) (2 ) Canadian Installations U.S. Installations Item Clearance Description (per CAN/CSA B149.1) (per ANSI Z223.1/NFPA 54) Clearance above grade, veranda, porch, deck, balcony...
  • Page 60 A12325 NOTE: The following is based upon National codes for gas appliances and is provided as a reference. Refer to local codes which may supersede these standards and/or recommendations. (1 ) (2 ) Canadian Installations U.S. Installations Item Clearance Description (per CAN/CSA B149.1) (per ANSI Z223.1/NFPA 54) Clearance above grade, veranda, porch, deck, balcony or...
  • Page 61 ¾ in. (222mm) for 3 in. (76mm) ¾ in. (172mm) for 2 in. (51mm) 12 in. (305mm) min. separation between bottom of combustion air and bottom of vent (Typ.) A13305 Fig. 53 - - Combustion Air and Vent Pipe Termination for Direct Vent (2- -Pipe) System Roof Termination (Preferred) Vent Maintain 12 in...
  • Page 62 12" (256mm) minimum 60”(1524 mm) or 1 additional elbow maximum CASING SIDE OR TOP ATTACHMENT COMBUSTION AIR PIPE (NON-DIRECT VENT FOR ALL MODELS EXCEPT MODULATING UNLESS INSTALLED IN ATTIC OR CRAWL SPACE) A13406 Fig. 55 - - Combustion Air Pipe Attachment OPTIONAL TERMINATION BRACKET FOR 2-PIPE TERMINATIONS...
  • Page 63 Ventilated Combustion Air intake pipe Pipe hangar 3” (76 mm) 12” (305 mm) Ventilated Combustion Air intake termination in crawl space CRAWL SPACE highest level of insulation ATTIC A10497 Fig. 57 - - Vent Terminations for Ventilated Combustion Air...

  • Page 64: Start- -Up, Adjustment, And Safety Check

    START- -UP, ADJUSTMENT, AND SAFETY Adjustments section for setup switch configurations. To set these setup switches for the appropriate requirement: CHECK 1. Remove blower door. NOTICE 2. Locate setup switches on furnace control. 3. Configure the set-up switches as necessary for the application.
  • Page 65 Prime Condensate Trap with Water WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow these warnings could result in personal injury or death. Failure to use a properly configured trap or NOT water- -priming trap before operating furnace may allow positive pressure vent gases to enter the structure through drain tube.
  • Page 66 level. The natural gas manifold pressures in Tables 19 and 20 CAUTION adjust for BOTH altitude and natural gas heating value. NOTE: For Canadian altitudes of 2000 to 4500 ft. (610 to 1372 FURNACE DAMAGE HAZARD M), use USA altitudes of 2001 to 2000 ft. (611 to 914 M) in Table Failure to follow this caution may result in reduced furnace life.

  • Page 67: Altitude Derate Multiplier For U.s.a

    Table 16 – Altitude Derate Multiplier for U.S.A.* 14. Tighten set screw on inlet tower pressure tap with 3/32- -in. ⅛ hex wrench, or if - -in. NPT plug was removed, apply pipe PERCENT DERATE ALTITUDE MULTIPLIER dope sparingly to end of plug and re- -install in the gas DERATE FACTOR* valve.
  • Page 68 MODULATING WARNING ON/OFF Switch Min/Max Heat Adust FIRE HAZARD (Under Cap) Failure to follow this warning could result in personal injury, death, and/or property damage. Manifold pressure tap set screw must be tightened and ⅛ - -in. NPT pipe plug must be installed to prevent gas leaks. Clocking The Meter Turn screw 1 click per second to adjust rate.
  • Page 69 12. Remove water column manometer or similar device from b. Check derate for altitude if applicable. manifold pressure tap. c. Check all return and supply ducts for excessive restrictions causing static pressure greater than 0.5- -in. w.c. WARNING d. Ensure Min/Int Heat Rise Adjust switch SW1- -3 on furnace control is in ON position when a bypass humidifier is used.

  • Page 70: Blower Off Delay Setup Switch

    NOTE: 6 ton airflow will truncate at 2200 CFM on applicable 5. Turn 115 VAC power on. models. 6. Re- -check Maximum Heat Temperature Rise. Air Conditioning Setup Switch SW2 After the temperature rise has been verified: 1. Remove jumpers from thermostat terminals. The high-speed or single-speed cooling airflow is adjusted by turning Setup switches SW2-1, SW2-2 and SW2-3 either ON or 2.
  • Page 71 c. Unblock return air to permit normal circulation. THERMOSTAT SUBBASE TERMINALS WITH d. Burners will re- -light when furnace cools down. THERMOSTAT REMOVED (ANITICIPATOR, CLOCK, ETC., 2. Check Pressure Switch(es) MUST BE OUT OF CIRCUIT.) This control proves operation of the draft inducer blower. HOOK-AROUND a.
  • Page 72 A190030 Fig. 64 - - Service Label Information (NEW)
  • Page 73 A190039 Fig. 65 - - Furnace Setup Switches and Description...
  • Page 74 A190040 NOTE: If SW4--1 is turned ON position, the furnace control will NOT communicate with a communicating system wall control. Fig. 65 - - Furnace Setup Switches and Description (Continued)

  • Page 75: Gas Rate

    Table 18 – Gas Rate (CU ft./hr) SIZE OF TEST DIAL SIZE OF TEST DIAL SECONDS SECONDS FOR 1 REVOLUTION FOR 1 REVOLUTION 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1800 1636 1500...
  • Page 76 Table 19 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate To Be Used with Modulating Furnaces Except 59MN7B060C21- -20 MODULATING FURNACE (TABULATED DATA BASED ON 20,000 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE...
  • Page 77 Table 19- - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued) To Be Used with Modulating Furnaces Except 59MN7B060C21- -20 MODULATING FURNACE (TABULATED DATA BASED ON 20,000 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE...

  • Page 78: Orifice Size And Manifold Pressure

    Table 20 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate To Be Used with Modulating Furnaces 59MN7B060C21- -20 Only (TABULATED DATA BASED ON 20,200 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE...

  • Page 79: Service And Maintenance Procedures

    Table 20 - - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued) To Be Used with Modulating Furnaces 59MN7B060C21- -20 Only (TABULATED DATA BASED ON 20,200 BTUH MAX-HEAT / 8,000 BTUH MIN-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE...
  • Page 80 NOTE: The Status Codes cannot be retrieved by disconnecting furnace can be installed in any of the 4 positions shown in Fig. 1, you must revise your orientation to component location the limit switch. To retrieve Status Codes, follow the procedure accordingly.
  • Page 81 6. RELEASE BLOWER DOOR SWITCH, reattach wire to 1. Check and clean air filter each month or more frequently if “R” terminal on furnace control board and replace blower required. Replace if torn. door. 2. Check blower motor and wheel for cleanliness each heating Care and Maintenance and cooling season.
  • Page 82 7. Replace filter cabinet door. 6. Clean blower wheel and motor by using a vacuum with soft brush attachment. Be careful not to disturb balance weights 8. Turn on electrical supply to furnace. (clips) on blower wheel vanes. Do not bend wheel or blades Blower Motor and Wheel Maintenance as balance will be affected.
  • Page 83 GROMMET MOTOR SHAFT FLAT MOTOR ARM SCREW SET SCREW MOTOR WHEEL HUB SEE DETAIL SCREW LOCATION BLOWER HSG ASSY BRACKET BRACKET ENGAGEMENT DETAIL CUTOFF, BLOWER WHEEL, BLOWER BLOWER HSG ASSY BRACKET CAPACITOR OR POWER CHOKE (WHEN USED) MOTOR, BLOWER SCREW (GND) A11584 Fig.
  • Page 84 WARNING BURNER SUPT. ASSY IGNITER BRACKET, IGNITER ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. BURNER ASSY Blower door switch opens 115- -v power to control. No component operation can occur unless switch is closed. Caution must be taken when manually closing this switch for service purposes.
  • Page 85 4. Align the orifices in the manifold assembly with the sup- WARNING port rings on the end of the burner. 5. Insert the orifices in the support rings of the burners. FIRE OR EXPLOSION HAZARD NOTE: If manifold does not fit flush against the burner, do not Failure to follow this warning could result in personal force the manifold on the burner assembly.
  • Page 86 Flushing Collector Box and Drainage System 10. Rinse condensate trap in warm water until trap is clean. 11. Flush condensate drain lines with warm water. Remember WARNING to check and clean the relief port on the collector box. 12. Shake trap dry. 13.
  • Page 87 WARNING ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury or death, or property damage. Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position and install a lockout tag. There may be more than one disconnect switch.
  • Page 88 6. Insert a field supplied funnel into the tube. CAUTION 7. Pour 1 quart of anti- -freeze solution into the funnel/tube. Antifreeze should run through the inducer housing, overfill UNIT COMPONENT DAMAGE HAZARD condensate trap and flow to an open drain. Failure to follow this caution may result in damage to the 8.
  • Page 89 A11290A Fig. 71 - - Troubleshooting Guide...
  • Page 90 A11290B...
  • Page 91 A11290C...

  • Page 92: Sequence Of Operation

    SEQUENCE OF OPERATION This furnace can operate as a modulating furnace with a single-stage thermostat because the furnace control CPU includes a CAUTION programmed adaptive sequence of controlled operation, which selects modulated rate between minimum- maximum-heat. This selection is based upon the stored history of UNIT OPERATION HAZARD the length of previous gas-heating periods of the single-stage thermostat.
  • Page 93 igniter will remain energized until flame is sensed or until maximum-heat. The blower motor BLWM will transition the 2-second flame proving period begins. to maximum-heat airflow five seconds after the furnace control CPU switches from a low range input to maxi- 4.
  • Page 94 The start up and shut down functions and delays described above thermostat is satisfied, the R to G-and-Y circuits are opened. The apply to the 2-stage minimum/maximum heating mode as well, outdoor unit will stop, and the furnace blower motor BLWM will except for switching from maximum- to minimum-heat.
  • Page 95 furnace blower motor BLWM high-cooling airflow. blower-off delay is decreased from 90 seconds to 5 sec- High-cooling airflow is based on the A/C selection shown in Fig. onds. Continuous Blower Mode The electronic air cleaner terminal EAC-1 is energized with 115 When the R to G circuit is closed by the thermostat, the blower vac whenever the blower motor BLWM is operating.
  • Page 96 signal disappears and the Y1 input is still energized the furnace shut OFF unless G is still energized, in which case the blower control CPU will transition the blower motor BLWM to motor BLWM will operate at continuous blower airflow. low-cooling airflow.
  • Page 97 CARRIER CORPORATION Consumer Relations Department P.O. Box 4808 Syracuse, New York 13221 1- -800- -CARRIER Have available the model number, series number, and serial number located on the unit rating plate to ensure correct replacement part. Model Nomenclature COOLING HEATING...
  • Page 98 Catalog No:59MN7B---01SI Copyright 2019 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Edition Date: 1/19 Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. Replaces: NEW...

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