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986TC
TWO- - STAGE, VARIABLE- -SPEED MULTIPOISE
35 in. (889 mm) Tall CONDENSING GAS FURNACE
Installation, Start- -up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the installation.
SECTION
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ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
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CONDENSATE DRAIN
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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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manufacturer's participation in the program.
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products, go to www.ahridirectory.org .
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Electrical Data
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Combustion- -Air Vent Pipe, Fitting & Cement Material..
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Maximum Allowable Exposed Vent Lengths Insulation
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Altitude Derate Multiplier for U.S.A.
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Blower Off Delay Setup Switch
Gas Rate
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Orifice Size and Manifold Pressure
TABLE
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Table of Contents
Related Manuals for Carrier 986TC
Summary of Contents for Carrier 986TC
- Page 1 986TC TWO- - STAGE, VARIABLE- -SPEED MULTIPOISE 35 in. (889 mm) Tall CONDENSING GAS FURNACE Installation, Start- -up, Operating and Service and Maintenance Instructions NOTE: Read the entire instruction manual before starting the installation. SECTION TABLE 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 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 such CARBON MONOXIDE POISONING HAZARD...
- Page 4 duct(s) sealed to the furnace casing and terminating outside This furnace is not approved for installation in mobile homes, recreational vehicles, or outdoors. the space containing the furnace. See “Air Ducts” section. This furnace is designed for minimum continuous return- -air 8.
- Page 5 LOCATION In the state of Massachusetts: S This product must be installed by a licensed plumber or gas fitter. CAUTION S When flexible connectors are used, the maximum length shall not exceed 36 in. (914 mm). S When lever type gas shutoffs are used they shall be T- -handle type. S The use of copper tubing for gas piping is not approved by the PERSONAL INJURY AND/OR PROPERTY state of Massachusetts.
- Page 6 WARNING WARNING CARBON MONOXIDE POISONING / COMPONENT FIRE HAZARD DAMAGE HAZARD Failure to follow this warning could result in personal Failure to follow this warning could result in personal injury injury, death and/or property damage. or death and unit component damage. Do not install the furnace on its back or hang furnace with Corrosive or contaminated air may cause failure of parts control compartment facing downward.
- Page 7 A180203 SHIP WT. FURNACE SIZE BOTTOM INLET LB (KG) CABINET WIDTH OUTLET WIDTH AIR INTAKE WIDTH 42060C17 17--- 1/2 (445) 15--- 7/8 (403) 16 (406) 8--- 3/4 (222) 151.0 (68.5) 42080C17 17--- 1/2 (445) 15--- 7/8 (403) 16 (406) 8--- 3/4 (222) 152.5 (69.2) 60080C21 21 (533)
- Page 8 THE BLOWER IS LOCATED BELOW THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED UPWARD. THE BLOWER IS LOCATED TO THE RIGHT OF THE BURNER SECTION, AND CONDITIONED AIR IS DISCHARGED TO THE LEFT. THE BLOWER IS THE BLOWER IS LOCATED TO THE LEFT LOCATED ABOVE THE OF THE BURNER SECTION, BURNER SECTION, AND...
- Page 9 AIR FOR COMBUSTION AND WARNING VENTILATION Introduction CARBON MONOXIDE POISONING HAZARD Direct Vent (2- - pipe) Applications Failure to follow this warning could result in personal injury or death. When the furnace is installed as a direct vent (2-pipe) furnace, no special provisions for air for combustion are required.
- Page 10 Indoor Combustion AirE NFPA & AGA 1. Adjoining rooms can be considered part of a space if: a. There are no closeable doors between rooms. Standard and Known- - Air- - Infiltration Rate Methods b. Combining spaces on same floor level. Each opening shall Indoor air is permitted for combustion, ventilation, and dilution, if have free area of at least 1 in.
- Page 11 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) (1 SQ. IN./4,000 BTUH) FURNACE (1,100 SQ.
- Page 12 CONDENSATE TRAP NOTICE Condensate Trap - - Upflow Orientation When the furnace is installed in the upflow position, it is not The field- -supplied, accessory horizontal drain trap grommet is necessary to relocate the condensate trap or associated tubing. ONLY REQUIRED FOR DIRECT VENT APPLICATIONS. Refer to Fig.
- Page 13 Vent Pipe Clamp Condensate Trap Vent Elbow Clamp Relief Port Collector Box Plugs Vent Elbow Collector Box Plug Condensate Trap Relief Port Condensate Trap Outlet Pressure Switch Port UPFLOW TRAP CONFIGURATION 1 & 2 Stage Units A11307 Fig. 9 - - Upflow Trap Configuration (Appearance may vary)
- Page 14 Remove pressure switch tube from front pressure switch and discard. A new tube is shipped in the loose parts bag. Remove relief tube from relief Remove tube from relief port. port on condensate trap. Remove the screw that secures the trap to the collector box and remove trap.
- Page 15 Remove plug from If alternate vent position collector box. is required, loosen clamp DO NOT DISCARD. on inlet of vent elbow. Remove the screw that secures the trap to the collector box and remove trap. Unconverted Factory Configuration As Viewed in the Horizontal Right Orientation NOTE: Remove knockout in casing before re installing the condensate trap.
- Page 16 Remove the screw that secures the condensate trap to the collector box and remove trap. If alternate vent position is required, loosen clamp on vent elbow inlet. 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.
- Page 17 CONDENSATE DRAIN CONNECTION 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 CAUTION below: NOTE: On narrower casings, it may be easier to remove the condensate trap, connect the drain line components and re-install FROZEN AND BURST WATER PIPE HAZARD the condensate trap.
- Page 18 6. From the outside of the casing, insert the angled end of the Z-pipe through drain hole in the left side of the casing and behind the inducer or gas valve. Allow the Z-pipe to temporarily rest on the blower shelf (upflow) or burner box (downflow).
- Page 19 misalignment of the drain pipe which may cause kinks in ATTACH ELBOW TO FORMED END the elbow or grommet. CONDENSATE TRAP OF GROMMET CUT FORMED END OFF 7. The remaining drain line can be constructed from field- - CONDENSATE DRAIN supplied 1/2- -in.
- Page 20 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 21 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 22 UPFLOW DOWNFLOW HORIZONTAL PERFORATED DISCHARGE DUCT 90° 90° FLANGE 120° 120° 120° A10493 Fig. 19 - - Duct Flanges Return Air Connections 3. Install another nut on other side of furnace base. (Install flat washer if desired.) WARNING 4. Adjust outside nut to provide desired height, and tighten in- side nut to secure arrangement.
- Page 23 3. Construct plenum to dimensions specified in Table 8 and CAUTION Fig. 30. 4. Install special base coil assembly or coil box as shown in in Fig. 30. MINOR PROPERTY HAZARD NOTE: It is recommended that the perforated supply- -air duct Failure to follow this caution may result in minor property flanges be completely removed from furnace when installing the damage.
- Page 24 Connect supply- -air duct to flanges on furnace supply- -air outlet. Bend flange upward to 90_ with wide duct pliers. See Fig. 19. The supply- -air duct must be connected to ONLY the furnace supply- -outlet- -air duct flanges or air conditioning coil casing (when used).
- Page 25 BOTTOM CLOSURE SCREWS (2) Representative drawing only, SCREWS (4) some models may vary in appearance. Lay furnace on the back or side BOTTOM PLATE Remove the two (2) screws that secure the bottom closure panel to the furnace casing and remove the Representative drawing only, some models may vary in appearance.
- Page 26 COMBUSTION-AIR PIPE (SEE VENTING SECTION) 2-IN. (51 mm) ROLLOUT PROTECTION REQUIRED Install 12” x 22” (204 x 559 mm) sheet metal in front of and above the burner compartment area. The sheet metal MUST extend above the furnace casing by 1-in. (25 mm with the door removed. A 1-in.
- Page 27 Design the filter and associated ductwork for the best match of Provide duct transitions, as required, to smoothly transition airflow pressure drop versus filter size. Best practice usually chooses filter from the return duct system to the filter (or IAQ device) to the systems with pressure drops under 0.2 in.
- Page 28 Table 7 – Filter Media Pressure Drop (Clean) Versus Face Velocity- - In. W.C. (Pa) Representative After-Market Filter Media* Factory-Accessory Face Velocity Washable Fiberglass* Pleated* (m/s) (1-in. / 2.5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in.
- Page 29 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. 30 - - Installation on Combustible Flooring Table 8 –...
- Page 30 AIR DUCTS Return Duct Sizing Refer to the Filter Selection and Duct Sizing section for NOTICE information on the proper selection of filter sizes and the associated ductwork and duct transitions. Improperly designed filtering systems and return ductwork are the most common causes of Many states, provinces and localities are considering or have airflow and/or noise complaints in HVAC systems.
- Page 31 Table 9 – 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: Clg/CF Switch settings External Static Pressure (ESP) 42060C17 Clg Switches SW2--- 3 SW2--- 2 SW2--- 1...
- Page 32 Cooling and Heating Air Delivery - - CFM continued (Bottom Return with Filter) (SW1---5 and SW4---3 set to OFF, except as indicated. See notes 1 and 2.) Unit size: Clg/CF Switch settings External Static Pressure (ESP) 60080C21 Clg Switches SW2--- 3 SW2--- 2 SW2--- 1 Clg Default:...
- Page 33 Cooling and Heating Air Delivery - - CFM continued (Bottom Return with Filter) (SW1---5 and SW4---3 set to OFF, except as indicated. See notes 1 and 2.) Unit size: Clg/CF Switch settings External Static Pressure (ESP) 66120C24 Clg Switches SW2--- 3 SW2--- 2 SW2--- 1 Clg Default:...
- Page 34 If pressure exceeds 0.5 psig (14- -In. W.C.), gas supply pipe must be NOTICE disconnected from furnace and capped before and during supply pipe pressure test. If test pressure is equal to or less than 0.5 psig In the state of Massachusetts: (14- -In.
- Page 35 WARNING SUPPLY ELECTRICAL SHOCK AND FIRE HAZARD FRONT Failure to follow this warning could result in personal injury, death, or property damage. MANUAL SHUT OFF The cabinet MUST have an uninterrupted or unbroken VALVE ground according to NEC NFPA 70- -2011 or local codes to (REQUIRED) minimize personal injury if an electrical fault should occur.
- Page 36 Use a separate, fused branch electrical circuit with a properly sized factory ground wire are secured to the bracket grounding screw. If fuse or circuit breaker for this furnace. See Table 11 for wire size the J- -Box cover is not used, the field and factory spliced and fuse specifications.
- Page 37 5. Pull furnace line voltage power wires through strain- -relief 5. Connect field ground wire and factory ground wire to green bushing of the external electrical box. ground screw on J- -Box mounting bracket as shown in Fig. 6. Pull the ground wire of the field line voltage wiring through the strain- -relief bushing into the furnace casing.
- Page 38 marked EAC- -1 and EAC- -2. The terminals are rated for 4. Outside Air Thermistor (OAT) 115VAC, 1.0 amps maximum and are energized during The OAT connection is used in conjunction with communi- blower motor operation. cating User Interface. It is not required when the furnace is controlled by a standard type thermostat.
- Page 39 W/W1 Y/Y2 A11401 Fig. 37 - - Typical Two- -Stage Field Wiring Diagram COMMUNICATION CONTINUOUS FAN OUTDOOR SW4 SETUP CONNECTOR (CF) AIRFLOW AIR TEMP SWITCHES SETUP SWITCHES CONNECTOR MODEL PLUG CONNECTOR SW1 SETUP SWITCHES AND BLOWER OFF- DELAY AIR CONDITIONING (A/C) AIRFLOW SETUP SWITCHES HUMIDIFIER...
- Page 40 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 41 8. Configure thermostat for two-stage compressor operation. Refer to thermostat instructions. 9. Configure thermostat for HYBRID HEATr dual fuel operation. Refer to thermostat instructions. 10. NO connection should be made to the furnace HUM terminal when using a thermostat with a 24 volt humidifier output. 11.
- Page 42 Other gas appliances with their own venting system may also use WARNING the abandoned chimney as a raceway providing it is permitted by local code, the current edition of the National Fuel Gas Code, and the vent or liner manufacturer’s installation instructions. Care must CARBON MONOXIDE POISONING HAZARD be taken to prevent the exhaust gases from one appliance from Failure to follow the steps outlined below for each appliance...
- Page 43 Table 12 – Vent Termination Kit for Direct Vent (2- -pipe) Systems Approved Two- Pipe Termination Fittings Vent and Allowable 1 1/2--in. 2--in. 2 1/2--in. 3--in. 4--in. Combustion Air Concentric Vent (38 mm) (51 mm) (64 mm) (76--mm) (102 mm) Pipe Diameters 1 1/2--in.
- Page 44 other requirements to and/or exemptions from the National codes 4. Do not locate termination directly into prevailing winds. shown in the figures. Termination should be positioned so that it will not be affected by sustained prevailing winds over 30 mph, wind Roof termination is the recommended termination location.
- Page 45 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. 41 - - Combustion Air and Vent Pipe Termination for Direct Vent (2- -Pipe) System Ventilated Combustion Air There are no additional restrictions on unobstructed distances greater than 8 ft.
- Page 46 FURNACE NOT IN HORIZONTAL SECTION PIPE DIAMETER TRANSITION IN VERTICAL SECTION A93034 Fig. 42 - - Combustion Air and Vent Pipe Diameter Transition Location and Elbow Configuration The Maximum Vent Length for the vent and combustion air pipe EXAMPLE FOR UPFLOW INSTALLATIONS.
- Page 47 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 48 In any configuration, it will be necessary to add the equivalent 9. If the Total Vent Length is longer than the Maximum length of the tee (15 feet/5 M) to the Total Equivalent Vent Length Equivalent Vent Length for the diameter of pipe chosen, of the venting system.
- Page 49 Near Furnace Vent Connections vent pipe can pass through the vent pipe adapter; it cannot pass through the inlet pipe adapter. Offsets in the vertical portion of the vent pipe should be made with 2. Align the screw holes in the plastic vent pipe adapter with 45 deg.
- Page 50 17. Slope the vent and combustion air piping downward termination elbows as shown in Figs. 41, 40 and 57. towards furnace. A minimum slope of at least 1/4-in. (6 For Ventilated Combustion Air Termination, See Fig. 58. mm) per linear ft.(1-in (25 mm) per 4 ft.(1.2 M)) with no 19.
- Page 51 11. Slide the end of the coupling with notches in it over the Disassemble loose pipe fittings. Clean and cement using same standoffs in the vent pipe adapter. procedures as used for system piping. DO NOT CEMENT POLYPROPYLENE FITTINGS. 12. Tighten the clamp of the coupling over the vent pipe adapter.
- Page 52 1. Cut two holes, one for each pipe, of appropriate size for termination, or pair of vent terminations, must be at least 36 in. pipe size being used. (914 mm) away from the first two terminations. It is important that vent terminations be made as shown in Fig.
- Page 53 Table 15 – Maximum Allowable Exposed Vent Lengths Insulation Table Maximum Allowable Exposed Vent Length in Unconditioned Space - - Ft. Unit Size 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. 1 ½ 2 ½...
- Page 54 Maximum Allowable Exposed Vent Length in Unconditioned Space - - Meters (continued) Unit Size 120,000 BTUH 140,000 BTUH Uninsulated 3/8-in. Insulation 1/2-in. Insulation Uninsulated 3/8-in. Insulation 1/2-in. Insulation Pipe Dia. 15.2 12.2 22.9 28.9 22.9 32.0 16.7 15.2 19.8 32.0 19.8 38.1 Winter...
- Page 55 VENT TERMINAL CONFIGURATIONS ELBOW CONFIGURATIONS Concentric Long Medium Mitered Standard 2-in., 3-in., or optional 4-in. termination. A13110 Table 17 – Deductions from Maximum Equivalent Vent Length - - Ft. (M) Pipe Diameter (in): 1-1/2 2-1/2 Mitered 90º Elbow (2.4) (2.4) (2.4) (2.4) (2.4)
- Page 56 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 17. 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 57 TABS ON THE INDUCER OUTLET RESTRICTOR SNAP INTO THE SLOTS AT THE OUTLET OF THE INDUCER FOR USAGE: SEE MAXIMUM EQUIVALENT VENT LENGTH TABLE (10FT. (3.1 M) OF VENT OR LESS ONLY) A170006 Fig. 46 - - Inducer Vent Elbow Slope vent pipe back to the furnace at least ¼”...
- Page 58 A190032 Fig. 48 - - 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 59 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 DOWNFLOW LEFT CONFIGURATION A11309A A11311A Rotate vent elbow to required position. Any other unused Any other unused knockout may be used knockout may be used...
- Page 60 ALTERNATE COMBUSTION AIR CONNECTIONS HORIZONTAL LEFT ---VERTICAL VENT CONFIGURATION HORIZONTAL RIGHT ---VERTICAL VENT CONFIGURATION A11327A A11337 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 A11328A A11336...
- Page 61 NOTES FOR VENTING OPTIONS 1. Attach vent pipe adapter with gasket to furnace casing. 2. Align notches in rubber coupling over standoffs on adapter. Slide clamps over the coupling. 3. Slide vent pipe through adapter and coupling into vent elbow. 4.
- Page 62 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 63 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 64 OPTIONAL TERMINATION BRACKET FOR 2-PIPE TERMINATIONS OPTIONAL BRACKET 12-IN. COUPLING (305 MM) 12 IN. (305 MM) SEPARATION BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM OF VENT. MAINTAIN 12 IN. (305 MM) CLEARANCE ABOVE HIGHEST ANTICIPATED 12-IN. (305 MM) SNOW LEVEL OR GRADE, ABOVE ANTICIPATED WHICHEVER IS GREATER.
- Page 65 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. 58 - - Vent Terminations for Ventilated Combustion Air...
- Page 66 START- - UP, ADJUSTMENT, AND SAFETY 2. Locate setup switches on furnace control. 3. Configure the setup switches as necessary for the CHECK application. NOTICE 4. Replace blower door. NOTE: If a bypass humidifier is used, setup switch SW1-4 (Comfort/Efficiency) should be in OFF=Efficiency position. This Important Installation and Start- -up Procedures compensates for the increased temperature in return air resulting Failure to follow this procedure may result in a nuisance...
- Page 67 Adjustments CAUTION WARNING UNIT OPERATION HAZARD Failure to follow this caution may result in intermittent unit FIRE HAZARD operation or performance satisfaction. Failure to follow this warning could result in personal Condensate trap must be PRIMED or proper draining may injury, death and/or property damage.
- Page 68 EXAMPLE 1 NOTICE EXAMPLE: 0 - - 2000 ft. (0 - - 609.6M) altitude Heating value = 1050 Btu/cu ft. The NATURAL GAS manifold pressure adjustments in Table Specific gravity = 0.62 21 compensate for BOTH altitude AND gas heating value. Therefore: Orifice No.
- Page 69 c. Connect a water column manometer or similar device to THERMOSTAT SUBBASE manifold pressure tap. TERMINALS WITH THERMOSTAT REMOVED d. Turn gas valve ON/OFF switch to ON. (ANITICIPATOR, CLOCK, ETC., e. Move setup SW1- -2 on furnace control to ON position to MUST BE OUT OF CIRCUIT.) lock furnace in low- -heat operation.
- Page 70 2. Restore furnace to normal operating condition. (2.) Check derate for altitude, if applicable. a. Turn gas valve ON/OFF switch to OFF. (3.) Check all return and supply ducts for excessive restrictions causing static pressure greater than b. Remove water column manometer or similar device from 0.5- -In.
- Page 71 The Continuous Fan airflow selection via Setup switches SW3 is 1. Check Main Limit Switch also the switch setting for low-speed cooling when the furnace is This control shuts off combustion system and energizes air- -cir- used with a 2-speed cooling or heat pump unit. Adjust the culating blower motor, if furnace overheats.
- Page 72 A190157 Fig. 64 - - Service Label Information...
- Page 73 042060 042080 060080 066100 066120 042060 042080 060080 066100 066120 042060 042080 060080 066100 066120 042060 042080 060080 066100 066120 A13216 Fig. 65 - - Furnace Setup Switches and Description...
- Page 74 A190155 Fig. 65 - - Furnace Setup Switches and Description (Continued)
- Page 75 Table 18 – Altitude Derate Multiplier for U.S.A. Table 19 – Blower Off Delay Setup Switch SETUP SWITCH ALTITUDE PERCENT DERATE (SW1---7 AND ---8) MULTIPLIER DESIRED HEATING MODE POSITION DERATE FACTOR* BLOWER OFF DELAY (SEC.) 0–2000 0---610 1.00 SW1--- 7 SW1--- 8 2001–3000 610---914...
- Page 76 Table 21 – Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate TWO-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60 0.62...
- Page 77 Table 19 - - Orifice Size and Manifold Pressure (In. W.C.) for Gas Input Rate (Continued) TWO-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE 0.58 0.60...
- Page 78 you must revise your orientation to component location a. Leave 115- -v power to furnace turned on. accordingly. b. Look into blower door indicator for current LED status. Electrical Controls and Wiring c. Remove blower door. Each pressure switch is labeled with the reference location (noted NOTE: The Status Codes cannot be retrieved by disconnecting as “COLLECTOR BOX- -LPS”...
- Page 79 Care and Maintenance 5. Inspect the vent pipe/vent system before each heating sea- son for water leakage, sagging pipes or broken fittings. WARNING Have vent pipes/vent system serviced by a qualified service agency. 6. Inspect any accessories attached to the furnace such as a hu- FIRE OR EXPLOSION HAZARD midifier or electronic air cleaner.
- Page 80 3. All factory wires can be left connected, but field thermostat 15. Reconnect blower leads to furnace control. Refer to furnace and accessory wiring may need to be disconnected depend- wiring diagram, and connect thermostat leads if previously ing on their length and routing. disconnected.
- Page 81 3. Align the edges of the one-piece burner with the slots in the WARNING burner assembly and slide the burners forward until they are fully seated in the burner assembly. 4. Align the orifices in the manifold assembly with the support ELECTRICAL SHOCK AND FIRE HAZARD rings on the end of the burner.
- Page 82 14. Check for gas leaks with a commercially available soap so- NOTE: Do NOT blow into tube with tube connected to the lution made specifically for the detection of leaks. pressure switch. 15. Turn gas on at electric switch on gas valve and at external 9.
- Page 83 where heat tape has been applied, check to ensure it will operate 6. Remove screws attaching burner assembly to cell panel. when low temperatures are present. See Fig. 66. NOTE: The Heat Pad, when used, should be wrapped around the NOTE: Burner cover, manifold, gas valve, and burner assembly condensate drain trap.
- Page 84 WINTERIZATION GROMMET MOTOR SHAFT FLAT MOTOR ARM CAUTION SCREW SET SCREW UNIT AND PROPERTY DAMAGE HAZARD MOTOR WHEEL HUB Failure to follow this caution may result in unit component or property damage. SEE DETAIL If the furnace is installed in an unconditioned space where the SCREW LOCATION ambient temperatures may be 32_ F (0_ C) or lower, freeze BLOWER HSG ASSY...
- Page 85 on- -time (from 0 to 16 minutes) which is permitted before switching to high- -heat. Low- -heat - - 45 sec after the gas valve GV- -M is opened the blower motor BLWM is turned ON at low- -heat airflow. If the power is interrupted, the stored history is erased and the control CPU will select low- -heat for up to 16 minutes and then High- -heat - - 25 sec after the gas valve GV- -M is opened...
- Page 86 valve solenoid GV- -M will remain energized as long as the opened. The outdoor unit stops, and the furnace blower BLWM low- -heat pressure switch LPS remains closed. The blower and electronic air cleaner terminal EAC- -1 will remain energized motor BLWM will transition to low- -heat airflow five sec for an additional 90 sec.
- Page 87 minutes each cooling cycle or until the R- -to- -G circuit clos- 7. Heat pump es or the demand for dehumidification is satisfied. Low- - See Fig. 38 and 39 for thermostat connections. cooling airflow is the true on- -board CF (continuous fan) When installed with a heat pump, the furnace control auto- selection as shown in Fig.
- Page 88 A190174 Fig. 71 - - Troubleshooting Guide...
- Page 89 A11326B Troubleshooting Guide (Continued)
- Page 90 A11326C Troubleshooting Guide (Continued)
- Page 91 A190153 Fig. 72 - - Wiring Diagram...
- Page 92 VOLTAGE MINOR CAPACITY CAPACITY SERIES 986TC - -A WARNING FIRE, EXPLOSION, ELECTRICAL SHOCK AND 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, or maintenance can cause personal injury, property damage, or death. Consult a qualified installer, service agency, or your local gas supplier for information or assistance.
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