Single & Two-Stage Stage Condensing Gas Furnaces 92.1% through 95% AFUE INSTALLATION INSTRUCTIONS MG3P Upflow Furnace WARNING MG3S Downflow Furnace AVERTISSEMENT FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in serious injury, death or property damage. • Installation and service must be performed by a qualified installer, service agency or the gas supplier.
TABLE OF CONTENTS IMPORTANT SAFETY INFORMATION...............................3 REQUIREMENTS & CODES...............................................3 Combustion Air Quality.............................................................. 4 Heating Load............................................................................. 4 Installation in a Garage.............................................................. 5 Clearances to Combustible Materials........................................
IMPORTANT SAFETY INFORMATION INSTALLER: Please read all instructions before servicing this equipment. Pay attention to all safety warnings and any other special notes highlighted in the manual. Safety markings are used frequently throughout this manual to designate a degree or level of seriousness and should not be ignored. WARNING indicates a potentially hazardous situation that if not avoided, could result in personal injury or death.
placed on each floor level where there are bedrooms. The detector shall comply with NFPA 720 (2005 Edition) and be mounted in the living area outside the bedroom(s). b.) A (CO) detector shall be located in the room that houses the appliance or equipment and shall: • Be powered by the same electrical circuit as the appliance or equipment.
methods. Excessive oversizing of the furnace could cause the furnace and/or vent to fail prematurely. In addition, the ductwork should be appropriately sized to the capacity of the furnace to ensure its proper airflow rating. For installations above 2,000 ft., the furnace should have a sea level input rating large enough that it will meet the heating load after deration for altitude.
COMBUSTION AIR & VENTING REQUIREMENTS WARNING: CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death. The following steps shall be followed with each individual appliance connected to the venting system being placed in operation, while all other appliances connected to the venting system are not in operation: 1.
IMPORTANT INFORMATION • This furnace must be vented in compliance with the current revision of the National Fuel Gas Code (ANSI-Z223.1/NFPA54). Instructions for determining the adequacy of an installation can be found in the current revision of the NFGC (ANSI Z223.1 / NFPA54). Consult local codes for special requirements. These requirements are for US installations as found in the NFGC.
Example: If the combined input rate of all appliances is less than or equal to 100,000 Btuh, each opening must have a free area of at least 100 square inches. If the combined input rate of all appliances is 120,000 Btuh, each opening must have a free area of at least 120 square inches. Outdoor Air Using Horizontal Ducts If combustion air is taken from outdoors through horizontal ducts, the openings and ducts must have a minimum free area of one square inch per 2,000 Btuh of total appliance input.
Example: Vent or Chimney See Note --- 12" Max NOTE: Each opening to outside must be at least 1 sq. in. per 4,000 Btuh of total input rating. Water Heater A space with a water heater rated at 45,000 Btuh input and a furnace rated at 75,000 Btuh requires a volume of 6,000 cubic feet [50 x (45 + 75) = 6,000] to be considered unconfined. If the space has an 8 foot ceiling, the floor area of the space must be 750 square feet (6,000 / 8 = 750). Category IV Venting Furnace See Note 12" Max.
FURNACE MODELS (BTU) FURNACE INSTALLATION 54,000 DUAL VENT PIP LENGTH (FT.) WITH 1 LONG RADIUS ELBOW ON EACH PIPE† INLET / OUTLET 2” DIAMETER INLET / OUTLET 3” DIAMETER Upflow 70 90 72,000 Upflow 50 90 80,000 Downflow 30 90 90,000 108,000 Upflow Upflow 60 N/A 90 90 † in. 18” M ax. 36” M Table 1.
Exhaust Vent 12” Above Maximum Expected Snow Level (Both pipes) Combustion Air Elbows on the combustion air inlet must be positioned pointing away from the exhaust vent. Plumbing Vent Roof Boot (Both Pipes) in. 8" M ax. M 36" Figure 10. Vertical Vent Termination of the furnace combustion system. See list of substances on page 4. • Route piping as direct as possible between the furnace and the outdoors.
Winter Design Temperature Maximum Flue Pipe Length in Unconditioned and Exterior Spaces Without Insulation (feet) With Insulation (feet)* 45 20 10 70 70 60 20 0 -20 * = Insulation thickness greater than 3/8 inch, based on an R value of 3.5 (ft x F x hr) / (BTU x in.) Table 2. Vent Protection Vent Freezing Protection CAUTION: When the vent pipe is exposed to temperatures below freezing (i.e., when it passes through unheated spaces, chimneys, etc.
Plenums & Air Ducts • Plenums and air ducts must be installed in accordance with the Standard for the Installation of Air Conditioning and Ventilating Systems (NFPA No. 90A) or the Standard for the Installation of Warm Air Heating and Air Conditioning Systems (NFPA No. 90B). • Table 9 (page 37), Table 10 (page 38), Table 11 (page 39), Table 12 (page 40), & Table 13 (page 41) contain the maximum airflow and temperature rise data.
FURNACE INSTALLATION NOTE: These Installation procedures are suggested for typical furnace installations. Since each installation is different, the sequence of instructions may differ from the actual installation. ONLY QUALIFIED HVAC TECHNICIANS SHOULD INSTALL THIS FURNACE. The installer must be familiar with and comply with all codes and regulations applicable to the installation of these heating appliances and related equipment.
Downflow Furnace Installation REDUCER (See Notes) NOTE: These Installation procedures are suggested for typical furnace installations. Since all installations are different from each other, the sequence of instructions may differ from the actual installation. FELT-SEAL WARNING: FIBERGLASS INSULATION SPACERS DUCT CONNECTOR TABS NOTES: With reducer installed: Opening to duct is 10-1/4” x 13-1/4”. With reducer removed: Opening to duct is 13-1/4” x 13-1/4”. Figure 12.
Finger Tabs Fold duct flap here Remove this Flap Cut Here ere Cut Here Remove this Flap Cu tH tH ere Supply Air Duct Narrow Duct Cu Cutting Option A Cu tor nec Con abs T Duct Connector ere Bend tabs up 90° or Flo tH od Wo Cu Hole for Gas Line re e tH Fold duct flaps into duct connector Fold duct flap here Mounting Plate Secure Flaps with Staples or sheet metal screws Fold Flap Here Cutting Option B Cut Here Cut Here Cut Here ply Sup Duct Air Supply Air Duct Narrow Duct D
Bend tabs up 90° od Wo Coil Box or Flo Mounting Plate DO Screw Down Duct Connector Wood Floor Supply Air Duct NO T IN INST TH IS ALL S SU RF CRE AC WS E Hole for Gas Line 2 Screws both sides ply Sup Duct Air Figure 18. Screw-Down Duct Connector Figure 20. A/C Coil Box Installation Installing the Downflow Furnace 1. Prepare the AC coil box for installation by removing 2 screws from the sides of the A/C coil box. 2. Install the close-off plate on the bottom of the of the coil box.
4. Position the A/C coil box on the top of the furnace and secure in place using the provided attachment brackets. To install the brackets: position one bracket on side of furnace and using the provided self-drilling screws, secure the bracket to the A/C coil box and the furnace. Repeat for other side of furnace. 5. Position the plenum on top of the coil box and secure together with sheet metal screws. The screws must penetrate the sheet metal casing and coil box flange. 6.
cap to maintain air tightness in the furnace. Measurements for hole locations on MG3 series furnaces are shown in Figure 44 (page 36). Inducer Assembly Rotation WARNING: Inducer rotation must be completed before the furnace is connected to gas and electric. If both utilities have been connected, follow the shutdown procedures printed on the furnace label and disconnect the electrical supply. CAUTION: It is good practice to label all wires prior to disconnection.
Accessories The components in Figure 27, Figure 28 (page 20), Figure 29, & Figure 30 are included in the extra parts bag that is supplied with the purchase of MG3(P,S) furnaces. Depending on your particular installation, some of these components are optional and may not be used. Please refer to the descriptions and accompanying figures when installing these items. ø 2 1/4” Rubber Grommet Finish Flange The finish flange must be installed to vent the combustion air pipe through the top of the furnace.
3” PVC Pipes 3” Neoprene Couplings 2” PVC Pipe from Inline Drain Assembly (Not Included) 3” PVC Pipes Coil Box 2” x 3” Neoprene Couplings 2” PVC Tee 3” PVC Pipes 2” x 3” Neoprene Couplings 2” x 1/2” PVC Reducer 1/2” x 1/2” Hose Barb 1/2” Tubing (Field Supplied) UPFLOW FURNACE PVC Trap 1/2” x 3/4” Hose Barb Figure 31.
Furnace Filter Filter Retainer Brackets Furnace Flanges Bent up 90° (3 places) NOTE: For downflow models only. Figure 32. Filter Retainer Brackets VentilAire™ Bracket NOTE: For downflow models only. Figure 33. VentilAire™ Bracket 3” vent pipes 2” x 3” Neoprene Couplings 2” PVC Pipe Coil Box 2” x 450 PVC Elbow 2” Neoprene Couplings Figure 34.
GAS SUPPLY & PIPING WARNING: FIRE OR EXPLOSION HAZARD • Failure to follow safety warnings exactly could result in serious injury, death or property damage. • Installation and service must be performed by a qualified installer, service agency or the gas supplier. • Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. • • • • • WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance.
the main gas valve, emergency shutoff valve and flexible gas connectors (if applicable). The soap and water solution can be applied on each joint or union using a small paintbrush. If any bubbling is observed, the connection is not sealed adequately and must be retightened. Repeat the tightening and soap check process until bubbling ceases. IMPORTANT NOTE: When pressure testing gas supply lines at pressures greater than 1/2 psig (14 inch W.C.
Upflow Models Burner Assembly Manifold Burner Assembly Manifold Gas Valve Gas Valve See Note “A” Shut-Off Valve Pipe Nipple See Note “B” Elbow See Note “A” Pipe Nipple Shut-Off Valve See Note “B” Plug Drip Leg Drip Leg Elbow Ground Joint Union Ground Joint Union Right Side Entry Left Side Entry Downflow Models See Note “A” Shut-Off Valve See Note “A” Shut-Off Valve Elbow Elbow Plug Drip Leg See Note “B” Ground Joint Union Manifold See Note “B” Pipe Nipple Gas Valve Left Side E
6. Disconnect the wires from the terminals. 7. Remove the supply gas piping from the gas valve inlet. 8. Remove four screws securing the gas manifold assembly to the burner assembly. 9. Set aside the screws and remove the gas manifold assembly from the burner assembly.
Gas Valve Inlet Wire Terminals ON/OFF Knob Burner Orifices Manifold Screws (x4) Burner Assembly Figure 37. Burner & Manifold Assembly f.) Repeat steps 8 thru 12 for replacement of the LOW fire spring and adjustment screw. g.) Check and adjust the regulator setting. See Gas Pressure Adjustment Section. h.) Reinstall the cap screws on the HIGH and LOW regulators. Replacement cap screws are provided in the conversion kit. i.) Affix the label from the conversion kit to the gas valve. 13.
The ignitor may not ignite the gas until all of the air is bled from the gas line. If the ignition control locks out, adjust the thermostat to its lowest setting and wait one minute. Adjust the thermostat 5 degrees above room temperature and the ignitor will try again to ignite the main burners. This process may have to be repeated several times before the burners will ignite. Once the burners are lit, check all gas connections for leaks again with the soap and water solution.
• Field supplied wires should also connect the Y / Y2 & Y1 signals to the outdoor unit’s Y & Y1 terminals. • Connect terminal C to the outdoor unit’s C. ROOM THERMOSTAT (SINGLE STAGE) G W 1 C R DHUM DHUM Y Y C HIGH EFFICIENCY BLOWER MOTOR CONTROL BOARD A/C CONDENSING UNIT (SINGLE STAGE) Y/Y2 G W1 R Y1 W2 C TWO STAGE FURNACE BOARD Figure 38.
Heat Anticipator Setting Please Set the heat anticipator according to the instructions supplied by the thermostat manufacturer. To determine the heat anticipator setting: 1. Add the current draw of the system components; or 2. Measure the current flow on the thermostat R-W circuit after the circulating blower motor has started. Twinning WARNING: When servicing either twinned furnace, power must be turned off on both furnaces.
FURNACE MODEL NUMBER FURNACE INPUT (BTUH) CABINET WIDTH (IN.) NOMINAL ELECTRICAL SUPPLY MAXIMUM OPERATING VOLTAGE MINIMUM OPERATING VOLTAGE MAXIMUM FURNACE AMPERES MG3P-054U1AAB1 54,000 17 ½ 115-60-1 127 103 9.3 MG3P-072U1AAC1 72,000 21 115-60-1 127 103 9.3 MG3P-090U1AAC1 90,000 21 115-60-1 127 103 12 MG3S-080T2AAC1 MG3P-108U1AAD1 80,000 120,000 21 24 1/2 115-60-1 115-60-1 127 127 103 103 8.
EXAMPLE: • Time for 1 revolution of a gas meter with a 1 cubic ft dial = 40 seconds. • From Table 14 read 90 cubic ft gas per hr. • Local heating value of the gas (obtained from gas supplier) = 1,040 Btu per cubic ft. • Input rate = 1,040 x 90 = 93,600 Btuh. 5. Multiply the gas flow rate in cubic ft per hr by the heating value of the gas in Btu per cubic ft to obtain the input rate in Btuh. See example. 6.
MG3S OPERATING SEQUENCE The operating sequences for the heating, cooling, and fan modes are described below. Refer to the field and furnace wiring and ladder diagrams: Figure 45 (page 42), Figure 46 (page 43), Figure 47 (page 44), & Figure 48 (page 45) Heating Cycle 1. The thermostat calls for heat by energizing the W1 terminal with 24VAC. 2. The control checks to see the pressure switch is open. If the switch is closed, the furnace will shut down for 5 minutes before retrying 3.
DIAGNOSTIC DESCRIPTION GREEN LED RED LED Control Fault (No Power) Off Off L1/Neutral Polarity Fault Flash Flash 1 Hour Lockout Alternating Flash Normal Operation On On Pressure Switch Closed Fault On Flash Pressure Switch Open Fault Flash On Open Limit Switch Fault Flash Off On Off Motor Fault DIAGNOSTIC DESCRIPTION Low Flame Sensor Signal Flame Present YELLOW LED Continuous Flash On Table 7.
Air Filter(s) - An air filter is supplied with the furnace as shipped from the factory. It is recommended that filters be cleaned or replaced monthly during the heating season. WARNING: Never operate the furnace without a filter in place. Dust and lint can build up on internal components, resulting in loss of efficiency, equipment damage, and possible fire. New or newly renovated homes may require more frequent changing until the construction dust has minimized.
FIGURES & TABLES UPFLOW FURNACE Bottom Return Opening C TOP VIEW MODEL #’S DIM. “A” DIM. “B” DIM. “C” B MG3P-054U1AAB1 17 1/2 15 7/8 16 1/8 MG3P-072U1AAC1 21 19 3/8 19 5/8 MG3P-090U1AAC1 MG3P-108U1AAD1 21 24 1/2 19 3/8 22 7/8 19 5/8 23 1/8 FRONT BRACE FLANGES 23 1/2 Bottom Return Opening BOTTOM PANEL 19 NOTE: Dimensions shown in inches.
AIRFLOW DATA HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F) MODEL NAME/ HEATING INPUT RETURN AIR VIA: External Static Pressure (in. w.c.) MOTOR SPEED 0.1 0.2 0.3 0.4 0.
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F) MODEL NAME/ HEATING INPUT RETURN AIR VIA: External Static Pressure (in. w.c.) MOTOR SPEED 0.1 0.2 0.3 0.4 0.
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F) MODEL NAME/ HEATING INPUT RETURN AIR VIA: Bottom MG3P-090U1AAC1 90,000 BTU/Hr Side Side + Bottom or 2 sides MOTOR SPEED 5 - High* 4 - Alternate 3 - Med-High** 2 - Med-Low 1 - Low*** 5 - High* 4 - Alternate 3 - Med-High** 2 - Med-Low 1 - Low*** 5 - High* 4 - Alternate 3 - Med-High** 2 - Med-Low 1 - Low*** External Static Pressure (in. w.c.) 0.1 0.2 0.3 0.4 0.
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F) MODEL NAME/ HEATING INPUT RETURN AIR VIA: Bottom MG3P-108U1AAD1 108,000 BTU/Hr Side Side + Bottom or 2 sides MOTOR SPEED 5 - High* 4 - Med-High** 3 - Med-Low 2 - Alternate 1 - Low*** 5 - High* 4 - Med-High** 3 - Med-Low 2 - Alternate 1 - Low*** 5 - High* 4 - Med-High** 3 - Med-Low 2 - Alternate 1 - Low*** External Static Pressure (in. w.c.) 0.1 0.2 0.3 0.4 0.
HEATING AIRFLOW (CFM) & TEMPERATURE RISE (°F) MOTOR SWITCH EXTERNAL STATIC PRESSURE (IN.W.C.) MODEL NUMBER/ SETTINGS HEATING INPUT (0=OFF, 1=ON) MG3S-080T2AAC1 80,000 BTU/hr 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0.1 CFM 1,125 1,205 1,305 1,430 1,525 1,620 1,695 1,770 1,875 1,905 1,980 2,025 0.2 RISE 63 59 54 50 47 44 42 40 38 37 36 35 0.
Figure 45.
LADDER DIAGRAM Single Stage Furnaces L1 GND DOOR SWITCH N NEUTRAL GND L1 FLAME SENSOR P1-7 K4 EAC K3 P2-3 NEUTRAL BLOWER MOTOR CHOKE (SOME MODELS) GND NEUTRAL ELECTRONIC AIR CLEANER P2-6 HOT SURFACE IGNITOR HUM K2 NEUTRAL HUMIDIFIER P2-1 P2-4 INDUCER NEUTRAL XFORMER 120 VAC See Note TRANSFORMER R 3A FUSE W 24 VAC 24V TO MOTOR RELAYS P1-8 SUPPLY AIR ROLL-OUT LIMIT LIMIT P1-3 G P1-6 MICRO Y P1-5 K1 C 24V VENT LIMIT P1-4 P1-2 K8 K5 K6 K7 PRESSURE SWITCH BLOWER LIMIT SWI
Figure 47.
LADDER DIAGRAM 2-Stage FSHE Furnaces L1 GND DOOR SWITCH LINE LINE-N GND LINE BLOWER MOTOR LINE-N FURNACE CONTROL BOARD 624790 FLAME SENSOR P1-3 K6 N GND EAC P2-1 K3 P2-5 HOT SURFACE IGNITOR HUM K5 K4 P2-2 K4 P2-3 LOW XMFR HI P2-4 INDUCER XMFR-N 120 VAC TRANSFORMER 24 VAC P1-5 3A FUSE R W2 P4-1 W1 P4-2 G P4-3 Y/Y2 MICRO R C GND P4-4 Y1 P4-5 C P4-6 P1-9 P1-8 P1-10 Tx Rx FSHE BLOWER BOARD 624840 W W P1-11 GND P1-6 P1-12 P1-2 K1 K2 P1-1 P1-7 HI TO BLOWER MOT
W1 THERMOSTAT FAN SPEED NOT USED GREEN CONNECTION TERMINAL TO TWIN FURNACES RED OFF ON EXPANSION PORT CONNECTION TO FURNACE CONTROL BOARD TWIN DHUM Y1 C R NOT USED MOTOR WIRE HARNESS 1 2 3 4 5 6 78 HEAT COOL STATUS FOR WIRING TO THE MOTOR CONTROL BOARD R C W1 W2 G Y1 Y/Y2 Figure 49.
Gas Information GAS FLOW RATES (CUBIC FEET PER HOUR) CUBIC FEET PER REVOLUTION OF GAS METER TIME FOR ONE REVOLUTION (SECONDS) 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 GAS FLOW RATES (CUBIC FEET PER HOUR) 1 5 10 TIME FOR ONE REVOLUTION (SECONDS) 360 300 257 225 200 180 164 150 138 129 120 113 106 100 95 90 86 82 78 75 72 69 67 64 62 60 58 56 1,800 1,500 1,286 1,125 1,000 900 818 750 692 643 600 563 529 500 474 450 429 409 391 375 360 346 333 321 310 300 290
ALTITUDE ABOVE SEA LEVEL 650 700 750 800 850 900 950 1,000 1,050 2,000 FT 3,000 FT 4,000 FT 5,000 FT 6,000 FT 7,000 FT 8,000 FT 9,000 FT 10,000 FT LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW HIGH LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH
Venting Information AIR SUPPLY INLET VENT TERMINAL AREA WHERE TERMINAL IS NOT PERMITTED CANADIAN INSTALLATIONS A US INSTALLATIONS B DIRECT VENT (2-PIPE) & CONVENTIONAL VENT (1-PIPE) FURNACES DIRECT VENT (2-PIPE) FURNACES CONVENTIONAL VENT (1-PIPE) FURNACES 12 inches (30cm) 12 inches (30cm) 12 inches (30cm) 6 inches (15cm) for appliances < 10,000 Btuh (3kW) 6 inches (15cm) for appliances < 10,000 Btuh (3kW) 12 inches (30cm) for appliances 10,000 Btuh - 100,000 Btuh (30kW) 9 inches (23cm) for
MG3P HORIZONTAL VENTING (2-Pipe, Upflow Furnace Shown) First Support as Close to Furnace as Possible 3” x 90° Elbows Straps or Other Suitable Supports at minimum 5 ft. Intervals Seal / Caulk Around Pipes at Wall 3” x 90° Elbow Upward Pitch 1/4” Per Foot (Exhaust Vent) 3” Exhaust Vent 3” Combustion Air Vent Pipe 2” x 3” Neoprene Couplings with 2 Hose Clamps 7” 12” Min.
MG3S HORIZONTAL VENTING (2-Pipe, Downflow Furnace Shown) Straps or Other Suitable Supports at minimum 5 ft. Intervals Seal/Caulk Around Pipes at Building 90° Elbow 90° Elbow COMBUSTION AIR 90° Elbow Upward Pitch - 1/4” per foot (Flue Pipe) Coupling with 2 Hose Clamps (Optional) FLUE PIPE First support placed as close to furnace connection as possible 7” Wall 12” Min.
COMBUSTION AIR COMBUSTION AIR Plug FLUE PIPE X See NOTE 5 Plug OPTION 1 PVC Tee X See NOTE 5 Rubber Grommet OPTION 3 OPTION 2 PVC Trap See VIEW A for drain line positions VIEW -A- FLUE PIPE Plug Plug COMBUSTION AIR Plug Rubber Grommet FLUE PIPE MG3P UPFLOW OPTIONS - 1 PIPE Rubber Grommet See VIEW C for drain line positions See VIEW B for drain line positions VIEW -B- Inline Drain Tube (Factory Supplied) See NOTE 4 Inline Drain Tube (Factory Equipped) See NOTE 4 VIEW -C- Collector
Option 8 X FLUE PIPE Plug PVC Tee Plug See NOTE 5 COMBUSTION AIR COMBUSTION AIR Plug X Option 7 FLUE PIPE Rubber Grommet PVC Trap Option 9 Plug COMBUSTION AIR FLUE PIPE MG3S SERIES DOWNFLOW - 1 PIPE OPTIONS See NOTE 5 PVC Tee Rubber Grommet PVC Trap Rubber Grommet See VIEW D for drain line positions See VIEW E for drain line positions Field Supplied Drain Line Attached to PVC Trap (Do Not Trap) Inline Drain (Factory Supplied) See NOTE 4 Collector Box Drain (Factory Equipped) See NO
FURNACE COMPONENTS The descriptions below are various functional components that affect the operation and shutting down of this furnace. Some of these components and their locations are shown in Figure 55. If any component of the furnace must be replaced, use only factory authorized replacement parts specified in the Replacement Parts List provided online. Blower Limit Switch - The Blower switch prevents furnace operation when blower is not operational.
INSTALLATION CHECKLIST ATTENTION INSTALLERS: It is your responsibility to know this product better than your customer. This includes being able to install the product according to strict safety guidelines and instructing the customer on how to operate and maintain the equipment for the life of the product. Safety should always be the deciding factor when installing this product and using common sense plays an important role as well.
