INSTALLATION INSTRUCTIONS Two−Stage ECM Motor and Single−Stage 35” Tall, High Efficiency Condensing Gas Furnace (F/G)9MXT, (F/G)9MXE These instructions must be read and understood completely before attempting installation. Safety Labeling and Signal Words DANGER, WARNING, CAUTION, and NOTE The signal words DANGER, WARNING, CAUTION, and NOTE are used to identify levels of hazard seriousness. The signal word DANGER is only used on product labels to signify an immediate hazard.
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.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Safety Considerations ! 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, maintenance, or use can cause carbon monoxide poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage.
INSTALLATION INSTRUCTIONS 9. 10. 11. 12. Gas Furnace: (F/G)9MXT, (F/G)9MXE The furnace may be used for construction heat provided that the furnace installation and operation complies with the first CAUTION in the LOCATION section on page 8 of these instructions. These Multipoise Gas−Fired Furnaces are CSA design−certified for use with natural and propane gases (see furnace rating plate) and for installation in alcoves, attics, basements, closets, utility rooms, crawlspaces, and garages.
INSTALLATION INSTRUCTIONS S Gas Furnace: (F/G)9MXT, (F/G)9MXE Sites, Communities, and Set-Ups),ANSI/NCS A225.1, and/or CAN/CSA-Z240, MH Series Mobile Homes. CANADA: Current edition of the Standard of Canada, Natural Gas and Propane Installation Code (NSCNGPIC) CAN/CSA B149.1 General Installation S S US: Current edition of the NFGC and the NFPA 90B. For copies, contact the National Fire Protection Association Inc.
INSTALLATION INSTRUCTIONS Figure 2 Gas Furnace: (F/G)9MXT, (F/G)9MXE Dimensions A180202 6 Specifications subject to change without notice.
INSTALLATION INSTRUCTIONS B C D CABINET WIDTH OUTLET WIDTH BOTTOM INLET WIDTH AIR INTAKE SHIP WT.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Location ! CAUTION PERSONAL INJURY AND/OR PROPERTY DAMAGE HAZARD Improper use or installation of this furnace may result 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.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE The following types of furnace installations may require OUTDOOR AIR for combustion due to chemical exposures: Commercial buildings Buildings with indoor pools Laundry rooms Hobby or craft rooms, and Chemical storage areas If air is exposed to the following substances, it should not be used for combustion air, and outdoor air may be required for combustion: Permanent wave solutions Chlorinated waxes and cleaners Chlorine based swi
INSTALLATION INSTRUCTIONS ! Gas Furnace: (F/G)9MXT, (F/G)9MXE WARNING Ventilated Combustion Air Applications FIRE HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. Do not install the furnace on its back or hang furnace with control compartment facing downward. Safety control operation will be adversely affected. Never connect return−air ducts to the back of the furnace.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Outdoor Combustion Air Method 1. Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent horizontal or vertical duct(s) or opening(s) directly communicating with the outdoors or spaces that freely communicate with the outdoors. 2. Figure 6 illustrates how to provide TWO OUTDOOR OPENINGS, one inlet and one outlet combustion and ventilation air openings to the outdoors. a.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Combination of Indoor and Outdoor Air b. Outdoor opening size reduction Factor is one minus the Ratio in a. above. c. Minimum size of Outdoor openings shall be the size required in Outdoor Combustion Air Method above multiplied by reduction Factor in b. above. The minimum dimension of air openings shall be not less than 3-in. (80 mm). 1. Indoor openings shall comply with the Indoor Combustion Air Method below and, 2.
INSTALLATION INSTRUCTIONS Figure 6 Gas Furnace: (F/G)9MXT, (F/G)9MXE Air for Combustion, Ventilation, and Dilution for Outdoors CONDENSATE TRAP Condensate Trap − Upflow Orientation When the furnace is installed in the upflow position, it is not necessary to relocate the condensate trap or associated tubing. Refer to Figure 8 for upflow condensate trap information. Refer to Condensate Drain section for information how to install the condensate drain.
INSTALLATION INSTRUCTIONS Figure 8 Gas Furnace: (F/G)9MXT, (F/G)9MXE Upflow Trap Configuration Vent Pipe Clamp Condensate Trap Relief Port Vent Elbow Clamp Collector Box Plugs Vent Elbow Collector Box Plug Condensate Trap Relief Port Pressure Switch Port Condensate Trap Outlet UPFLOW TRAP CONFIGURATION 1 & 2 Stage Units Representative drawing only, some models may vary in appearance.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Downflow Trap Configuration Connect the new pressure switch tube from Loose Parts bag to port on front pressure switch. Route tube through inducer stand−offs to adjust position of the tube. Trim excess tube. Connect pressure switch tube to port on collector box. Install the two plugs previously removed on the open ports of the collector box. Connect relief tube to port on collector box. Attach condensate trap with screw to collector box.
INSTALLATION INSTRUCTIONS Figure 10 Gas Furnace: (F/G)9MXT, (F/G)9MXE Unconverted Factory Configuration as viewed in the Horizontal Right Orientation Remove plug from collector box. DO NOT DISCARD. If alternate vent position is required, loosen clamp on inlet of vent elbow. Remove the screw that secures the trap to the collector box and remove trap. A11573LA Representative drawing only, some models may vary in appearance.
INSTALLATION INSTRUCTIONS Figure 11 Gas Furnace: (F/G)9MXT, (F/G)9MXE Unconverted Factory Configuration as viewed in the Horizontal Left Orientation 5 If alternate vent position is required, loosen clamp on vent elbow inlet. 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.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Condensate Drain Connection ! CAUTION FROZEN AND BURST WATER PIPE HAZARD Failure to protect against the risk of freezing may result in property damage. Special precautions MUST be made if installing furnace in an area which may drop below freezing. This can cause improper operation or damage to equipment. If furnace environment has the potential of freezing, the drain trap and drain line must be protected.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE For Left Side Condensate Drain Connection: 1. For left side condensate drainage, the drain line is routed from the condensate trap, behind the inducer (upflow) or gas valve (downflow) and out through the left side of the furnace casing. A pre-formed 1/2−in. CPVC “Z” pipe is provided with the furnace. The “Z“ pipe is long enough to extend across the casing for drain connections. 2. Locate the “Z” pipe.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Example of Field Drain Attachment (NOT ALLOWED) Figure 13 Figure 14 Example of Field Drain Attachment &RLO RU KXPLGLILHU GUDLQ ZKHQ XVHG Evaporator Coil + ++ + DIRECTION OF AIRFLOW + + = Positive pressure < + = Pressure lower than areas with + − = Negative pressure + Air gap here Open standpipe LQ KLJK PLQLPXP for coil or humidifier drain TEE (1/2” CPVC to 3/4” PVC adapter from loose parts bag.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Example of Field Drain Attachment cont. ÄÄÄÄÄÄÄÄÄ ÄÄÄÄÄÄÄÄÄ + + ÄÄÄÄÄÄÄÄÄ ÄÄÄÄÄÄÄÄÄ ÄÄÄÄÄÄÄÄÄ + ÄÄÄÄÄÄÄÄÄ ÄÄÄÄÄÄÄÄÄ Figure 17 Evaporator Coil 3/4 DIRECTION OF AIRFLOW + 3/4 Condensing Furnace + + + 3/4 + CONNECT SHORT END OF ’Z’ PIPE TO MODIFIED DRAIN ELBOW 3/4” PVC 3/4 <+ <+ - - - TEE (1/2” CPVC to 3/4” PVC adapter from loose parts bag.) <+ FACTORY SUPPLIED 1/2−IN. CPVC TO 3/4−IN.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE UPFLOW INSTALLATION Figure 20 Removing Bottom Closure Panel NOTE: The furnace must be pitched as shown in Figure 19 for proper condensate drainage. Figure 19 Furnace Pitch Requirements LEVEL 0-IN. (0 MM) TO 1/2-IN. (13 MM) MAX MIN 1/4-IN. (6 MM) TO 1/2-IN. (13 MM) MAX BOTTOM CLOSURE SCREWS (2) Representative drawing only, some models may vary in appearance. UPFLOW OR DOWNFLOW HORIZONTAL A11237 1. 2.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Leveling Legs (If Desired) In upflow position with side return inlet(s), leveling legs may be used. (See Figure 22) Install field−supplied, 5/16 x 1−1/2−in. (8 x 38 mm) (max) corrosion−resistant machine bolts, washers and nuts. Figure 22 Figure 23 Floor and Plenum Opening Dimensions Leveling Legs A96283 A89014 NOTE: Bottom closure must be used when leveling legs are used.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE when bottom return air is used. To remove bottom closure panel, see Figure 21 and Figure 20. HORIZONTAL INSTALLATION NOTE: The furnace must be pitched forward as shown in Figure 19 for proper condensate drainage. ! WARNING Suspended Furnace Support The furnace may be supported under the entire length of the furnace with threaded rod and angle iron. (See Figure 27) Secure angle iron to bottom of furnace as shown.
INSTALLATION INSTRUCTIONS Table 5 FURNACE CASING WIDTH IN. (mm) 14–3/16 (360) 17–1/2 (445) 21 (533) 24−1/2 (622) Figure 25 Gas Furnace: (F/G)9MXT, (F/G)9MXE Opening Dimensions − in.
INSTALLATION INSTRUCTIONS Figure 27 Gas Furnace: (F/G)9MXT, (F/G)9MXE Suspended Furnace Installation 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. (25 mm) clearance minimum between top of furnace and combustible material is required.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Roll−Out Protection Provide a minimum 12−in. x 22−in. (305 x 559 mm) piece of sheet metal for flame roll−out protection in front of burner area for furnaces closer than 12−in. (305 mm) above the combustible deck or suspended furnaces closer than 12−in. (305mm) to joists. The sheet metal MUST extend underneath the furnace casing by 1−in. (25mm) with the door removed.
INSTALLATION INSTRUCTIONS Table 7 Gas Furnace: (F/G)9MXT, (F/G)9MXE Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa) 14 x 25 Filter CFM L/s 600 (283) 800 (378) 1000 (472) 1200 (566) Factory-Accy Washable (1-in. / 2.5 cm) 0.04 (12) 0.06 (15) 0.07 (18) 0.08 (20) Representative After-Market Filter Media* Fiberglass* Pleated* (1-in. / 2.5 cm) (2-in. / 5 cm) (1-in. / 2.5 cm) (2-in. / 5 cm) 0.07 (17) 0.10 (26) 0.24 (60) 0.16 (40) 0.10 (25) 0.15 (39) 0.34 (85) 0.23 (59) 0.13 (34) 0.21 (52) 0.
INSTALLATION INSTRUCTIONS Figure 29 Gas Furnace: (F/G)9MXT, (F/G)9MXE Downflow Return Air Configurations and Restrictions External Filter Cabinet Configurations Figure 32 Accessory Bottom Filter Rack L10F033 Figure 30 Upflow Return Air Configurations and Restrictions L10F031 B A A 22−5/16 (566.4) 28−7/16 (722.2) L10F032 Figure 31 Horizontal Return Air Configurations and Restrictions HORIZONTAL TOP RETURN NOT PERMITTED FOR ANY MODEL 2−3/16 (55.5) Table 9 KIT NO.
INSTALLATION INSTRUCTIONS Figure 33 Gas Furnace: (F/G)9MXT, (F/G)9MXE your local distributor. The duct system should be sized to handle the required system design CFM at the design external static pressure. The furnace airflow rates are provided in the Service and Technical Support Manual.
INSTALLATION INSTRUCTIONS ! Gas Furnace: (F/G)9MXT, (F/G)9MXE WARNING Table 10 FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, and/or property damage. Gas valve inlet and/or inlet pipe must remain capped until gas supply line is permanently installed to protect the valve from moisture and debris. Also, install a sediment trap in the gas supply piping at the inlet to the gas valve. Gas piping must be installed in accordance with national and local codes.
INSTALLATION INSTRUCTIONS Figure 35 Gas Furnace: (F/G)9MXT, (F/G)9MXE Gas Valves Automatic Gas Valve (Two−Stage) ON/OFF Switch Regulator Seal Cap Regulator Adjustment Regulator Seal Cap under Cap 1/2” NPT Inlet 1/8” NPT Inlet Pressure Tap If pressure exceeds 0.5 psig (14−in. w.c.), gas supply pipe must be disconnected from furnace and capped before and during supply pipe pressure test. If test pressure is equal to or less than 0.5 psig (14−in. w.c.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE ELECTRICAL CONNECTIONS ! WARNING ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage. S Before servicing, disconnect all electrical power to furnace. S When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly.
INSTALLATION INSTRUCTIONS Figure 38 Gas Furnace: (F/G)9MXT, (F/G)9MXE Heating and Cooling Application Single−Stage Wiring Diagram FIELD 24-V WIRING FIELD 115-, 208/230-, 460-V WIRING FACTORY 24-V WIRING FACTORY 115-V WIRING NOTE 2 W FIVE WIRE THREE-WIRE HEATING-ONLY C R G Y THERMOSTAT TERMINALS FIELD-SUPPLIED DISCONNECT 208/230- OR 460-V THREE PHASE BLOWER DOOR SWITCH BLK W BLK WHT C O N T R O L WHT GND GND 115-V FIELDSUPPLIED DISCONNECT AUXILIARY J-BOX R 208/230-V SINGLE PHASE G COM
INSTALLATION INSTRUCTIONS Figure 39 Gas Furnace: (F/G)9MXT, (F/G)9MXE Optional J−Box Locations OPTIONAL J−BOX LOCATIONS Representative drawing only, some models may vary in appearance. L12F024 Figure 40 J−Box Bracket Installation J−BOX MOUNTING SCREWS, BLUNT−TIP J−BOX MOUNTING BRACKET GROUND SCREW J−BOX COVER A170137 The J−Box must be used when field line voltage electrical connections are made to the furnace wiring harness inside the furnace casing.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE 8. Connect any code required external disconnect(s) to field power wiring. 9. Connect field power and neutral leads to furnace power leads inside the external electrical box as shown in Figure 41.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Connect an accessory 24 VAC, 0.5 amp. Maximum (if used) to the 1/4−in. male quick−connect HUM 24 VAC terminal and C screw terminal on the control board thermostat strip. (See Figure 44) NOTE: If the humidifier has its own 24 VAC power supply, an isolation relay may be required. Connect the 24 VAC coil of the isolation relay to the HUM 24 VAC and C screw terminal on the control board thermostat strip.
INSTALLATION INSTRUCTIONS Table 11 Gas Furnace: (F/G)9MXT, (F/G)9MXE Electrical Data UNIT SIZE 0401410 0401712 0601412 0601714 0801716 0802120 1002120 1202422 VOLTS− HERTZ− PHASE 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 UNIT SIZE 0261410 0401410 0401712 0601412 0601714 0801716 0802120 1002120 1202422 VOLTS− HERTZ− PHASE 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 115-60-1 (F/G)9MXT TWO−STAGE, ECM BLOWER FURNACES OPERATING MINIMUM VOLTAGE MAXI
INSTALLATION INSTRUCTIONS Figure 44 Gas Furnace: (F/G)9MXT, (F/G)9MXE Example of Single Stage Furnace Control for ECM Blower Motor − (F/G)9MXE HEAT OFFïDELAY 120 180 90 150 Y1 DHUM 24ïV THERMOSTAT TERMINALS TWINNING AND/OR COMPONENT TEST TERMINAL HUM 24VAC HUMIDIFIER TERMINAL (24ïVAC 0.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE 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.
INSTALLATION INSTRUCTIONS Table 12 Direct Vent (2−Pipe) Termination Kit 2−in (51 mm) Concentric Vent Kit 3−in (76 mm) Concentric Vent Kit 2−in (51 mm) Termination Bracket Kit 3−in (76 mm) Termination Bracket Gas Furnace: (F/G)9MXT, (F/G)9MXE Vent Termination Kit for Direct Vent (2−Pipe) Systems Termination System Single Penetration of Wall or Roof Single Penetration of Wall or Roof Diam. Of Combustion Air and Vent Pipes in.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE MATERIALS Table 13 USA CANADA Material PVC ABS Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (U.S.A. Installation) 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. See Table below for approved materials for use in the U.S.A. 3.
INSTALLATION INSTRUCTIONS Figure 47 Gas Furnace: (F/G)9MXT, (F/G)9MXE ALIGN NOTCHES IN VENT PIPE COUPLING OVER STAND− OFF ON ADAPTER. TORQUE LOWER CLAMP 15 LB−IN. WHEN REMAINING VENT PIPE IS INSTALLED, TORQUE UPPER CL AMP TO 15 LB−IN. A13076B Locating the Vent Termination General NOTE: Termination Requirements for the Provinces of Alberta and Saskatchewan are located at the end of this section.
INSTALLATION INSTRUCTIONS Figure 48 Gas Furnace: (F/G)9MXT, (F/G)9MXE Inside Corner Termination Clearance distances for items greater than 3 feet (1 meter ) away from the inside corner, refer to the Inside Corner Clearance Table. No operable windows, doors or intakes of any type within the shaded areas of Wall A and B. For all other items, refer to the Inside Corner Clearance Table. 3 ft. (1 M) 3 ft. (1 M) to 6 ft.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Direct Vent / 2−Pipe System Direct vent (2−pipe) vent and combustion air pipes must terminate outside the structure. See Figure 65 for references to vent clearances required by National code authorities. Allowable vent and combustion air terminations are shown in Figure 52.
INSTALLATION INSTRUCTIONS Figure 50 Gas Furnace: (F/G)9MXT, (F/G)9MXE Sample Inlet Air Pipe Connection for Polypropylene Venting Systems Figure 51 Vent Terminations EXAMPLE FOR UPFLOW INSTALLATIONS. MAY BE APPLIED TO OTHER CONFIGURATIONS. OPTIONAL BRACKET COUPLING 12 IN. (305 MM) MIN. SEPARATION BETWEEN BOTTOM OF COMBUSTION AIR AND BOTTOM OF VENT. MAINTAIN 12 IN. (305 MM) CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL OR GRADE, WHICHEVER IS GREATER.
INSTALLATION INSTRUCTIONS Figure 52 Gas Furnace: (F/G)9MXT, (F/G)9MXE Combustion Air and Vent Pipe Termination for Direct Vent (2−Pipe) System Roof Termination (Preferred) Vertical separation between combustion air and vent At least 36 in. (914mm) Note: “A” denotes 0 To 2 in. (51mm) Between the first 2 vents Third vent (and fourth vent, if used) must be 36 in. Away (914mm) A 8 ¾ in. (222mm) for 3 in.(76mm) 18 in. Maximum (457mm) 6 ¾ in. (172mm) for 2in. (51mm) At least 36 in.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Size the Vent and Combustion Air Pipes General Approved Two−Pipe Termination Fittings 2−1/2−in. 2−in. 3−in. (64 mm) (51 mm) (76−mm) Yes No No Yes No No Vent and Combustion Air Pipe Diameters 1−1/2−in. (38 mm) 2−in. (51 mm) 1−1/2−in. (38 mm) No No 2−1/2−in. (64 mm) No No No Yes No 3−in. (76−mm) 4−in. (102 mm) No No No No No No Yes Yes No Yes Furnace combustion air and vent pipe connections are sized for 2-in.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE The measured length of pipe used in a single or 2−pipe termination is included in the total vent length. Include deductions from the Maximum Equivalent Vent Length (MEVL) contained in the Venting Tables for elbows and flexible vent pipe.
INSTALLATION INSTRUCTIONS Figure 55 Gas Furnace: (F/G)9MXT, (F/G)9MXE Recommended Combustion Air Inlet Moisture Trap A A A TO CODE−APPROVED DRAIN OR CONDENSATE PUMP Recommend “T” fitting with 4−inch minimum height standpipe (A) of same diameter or larger extending upward. Tee Tee Dry Well Cap (water tight and removable) Dry Well Tee Cap (water tight and removable) Dry Well Cap (water tight and removable) A170134 Representative drawing only, some models may vary in appearance.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Configure the Furnace ! Install the Vent and Combustion Air Pipes WARNING CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in personal injury or death. To route the vent pipe and combustion air pipe through the furnace, the manufacturer supplied kit must be used. Failure to properly seal the blower compartment from the furnace vestibule could result in the circulation of carbon monoxide throughout the structure.
INSTALLATION INSTRUCTIONS Figure 58 Gas Furnace: (F/G)9MXT, (F/G)9MXE Upflow Configurations Figure 59 Downflow Configurations UPFLOW LEFT − VENT CONFIGURATION Representative drawing only, some models may vary in appearance. A11309 DOWNFLOW LEFT − VENT CONFIGURATION Representative drawing only, some models may vary in appearance. A11311 UPFLOW RIGHT − VENT CONFIGURATION Representative drawing only, some models may vary in appearance.
INSTALLATION INSTRUCTIONS Figure 60 Gas Furnace: (F/G)9MXT, (F/G)9MXE Horizontal Left Configurations Figure 61 Horizontal Right Configurations HORIZONTAL LEFT − VERTICAL VENT CONFIGURATION Representative drawing only, some models may vary in appearance. HORIZONTAL RIGHT − VERTICAL VENT CONFIGURATION Representative drawing only, some models may vary in appearance. HORIZONTAL LEFT − LEFT VENT CONFIGURATION Representative drawing only, some models may vary in appearance.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE NOTES: 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. Insert vent pipe into vent elbow. 5. Torque all clamps 15−lb.−in. 6. Attach combustion air pipe adapter with gasket to furnace. 7. Attach combustion air pipe to adapter with silicone. Pilot drill a 1/8−in.
INSTALLATION INSTRUCTIONS Diameter 1 1/2−in. 38−mm 2−in. 51−mm 2 1/2−in. 64−mm 3−in. 76−mm 4−in. 102−mm ! PVC Sch 40 3−ft. 914−mm 3−ft. 914−mm 3 1/2−ft. 1067−mm 3 1/2−ft. 1067−mm 4−ft. 1219−mm Gas Furnace: (F/G)9MXT, (F/G)9MXE Hanger Spacing Material SDR 21 & 26 ABS 2 1/2−ft. 3−ft. 762−mm 914−mm 3−ft. 3−ft. 914−mm 914−mm 3−ft. 3 1/2−ft. 914−mm 1067−mm 3−ft. 3 1/2−ft. 914−mm 1067−mm 3 1/2−ft. 4−ft.
INSTALLATION INSTRUCTIONS Figure 62 Gas Furnace: (F/G)9MXT, (F/G)9MXE Two−Pipe and Single−Pipe Terminations Combustion Air Pipe Single and two pipe vent must be installed as shown in Figure 52 and Figure 53. Maintain the required separation distance between vents or pairs of vents as shown in Figure 52 and Figure 53 and all clearance shown in Figure 65 or Figure 66.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE 1. Cut two holes, one for each pipe, of appropriate size for pipe size being used. 2. Loosely install elbow in bracket (if used) and place assembly on combustion−air pipe. 3. Install bracket as shown in Figure 49 and Figure 51. NOTE: For applications using vent pipe option indicated by dashed lines in Figure 52 and Figure 53, rotate vent elbow 90_ from position. 4. Disassemble loose pipe fittings.
INSTALLATION INSTRUCTIONS Figure 63 Gas Furnace: (F/G)9MXT, (F/G)9MXE Crawl Space Vent Termination Ventilated Combustion Air intake pipe Pipe hangar 3” (76 mm) 12” (305 mm) Ventilated Combustion Air intake termination in crawl space CRAWL SPACE Figure 64 L11F016A Attic Vent Termination Ventilated Combustion Air intake pipe Vent through roof flashing 12” (305 mm) min. above higest level of insulation ATTIC 58 Specifications subject to change without notice.
INSTALLATION INSTRUCTIONS Figure 65 Gas Furnace: (F/G)9MXT, (F/G)9MXE Direct Vent Termination Clearance V V 25−24−65−2 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.
INSTALLATION INSTRUCTIONS Figure 66 Gas Furnace: (F/G)9MXT, (F/G)9MXE Other than Direct Vent Clearance − Ventilated Combustion Air Option V V 25−24−65−2 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. Canadian Installations (1 ) U.S. Installations (2 ) Item Clearance Description (per CAN/CSA B149.1) (per ANSI Z223.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE (F/G)9MXE − MAXIMUM EQUIVALENT VENT LENGTH - Feet \ Meters Table 14 Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations Use Table 15 − DEDUCTIONS FROM MEVL to determine allowable vent length for each application. Altitude (feet) Single-Stage 95% - Feet/inches Unit Size Pipe Dia.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters) Table 15 Pipe Diameter (in): 11/2 2 21/2 3 4 Mitered 90º Elbow 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4) 8 (2.4) Medium Radius 90º Elbow 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5) 5 (1.5) Long Radius 90º Elbow 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9) 3 (0.9) Mitered 45º Elbow 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2) 4 (1.2) Medium Radius 45º Elbow 2.5 (0.8) 2.5 (0.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Venting System Length Calculations The Total Equivalent Vent Length 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.
INSTALLATION INSTRUCTIONS Gas Furnace: (F/G)9MXT, (F/G)9MXE Table 16 Maximum Allowable Exposed Vent Lengths Tables Maximum Allowable Exposed Vent Length in Unconditioned Space (Feet) Unit Size 26,000* BTUH 3/8-in. Insulation Uninsulated Winter Design Temp °F Pipe Dia. in. 20 0 20 40 1½ 20 5 2 20 5 1½ 50 25 15 10 Uninsulated Winter Design Temp °F 2 45 20 10 5 1½ 60 30 20 15 60,000 BTUH 3/8in. Insulation Unit Size Pipe Dia. in. 20 0 20 40 1/2-in.
