Rheem 97MDV060 Series Installation Instructions Manual
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Rheem 97MDV060 Series Installation Instructions Manual

Rheem 97MDV060 Series Installation Instructions Manual

(-)97v series upflow condensing modulating, communicating gas furnaces w/ecm blower (-)97v series
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INSTALLATION INSTRUCTIONS

FOR UPFLOW CONDENSING MODULATING,
COMMUNICATING GAS FURNACES W/ECM BLOWER
(-)97V SERIES
ISO 9001:2008
U.L. and/or C.S.A. recognized fuel gas and CO (carbon monoxide) detectors are rec-
ommended in all applications, and their installation should be in accordance with the
manufacturer's recommendations and/or local laws, rules, regulations, or customs.
92-24161-126-03
SUPERSEDES 92-24161-126-02

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  • Page 1: Installation Instructions

    INSTALLATION INSTRUCTIONS FOR UPFLOW CONDENSING MODULATING, COMMUNICATING GAS FURNACES W/ECM BLOWER (-)97V SERIES U.L. and/or C.S.A. recognized fuel gas and CO (carbon monoxide) detectors are rec- ommended in all applications, and their installation should be in accordance with the manufacturer’s recommendations and/or local laws, rules, regulations, or customs. ISO 9001:2008 92-24161-126-03 SUPERSEDES 92-24161-126-02...
  • Page 2 TABLE OF CONTENTS 1 TABLE OF CONTENTS..... . . 2 8 CONDENSATE DRAIN AND DRAIN NEUTRALIZER ......42 2 GENERAL INFORMATION .

  • Page 3: General Information

    GENERAL INFORMATION NOTE: A heat loss calculation should be performed to 1. As non-direct vent central forced air furnaces taking properly determine the required furnace BTU size for the combustion air from the installation area or using air structure. Also, the duct must be properly designed and in- ducted from the outside.
  • Page 4 GENERAL INFORMATION (cont.) In Canada installations must comply with CSA B149.1. CALIFORNIA RESIDENTS ONLY Install units in Canada in accordance with CSA-B149, IMPORTANT: All manufacturer products meet current local installation codes and authorities having jurisdiction. Federal OSHA Guidelines for safety. California Proposition CSA-B149.1 is available from: 65 warnings are required for certain products, which are not covered by the OSHA standards.
  • Page 5 Installation Instructions remain with the furnace as a reference guide to the servicing contractor. We recommend that performance and installation data be recorded for future reference on this sheet to meet service and warranty obligations so that job site information is available when required. Installation Checklist ______ no.

  • Page 6: Safety Information

    SAFETY INFORMATION W RNING W RNING DO NOT INSTALL THIS FURNACE IN A MOBILE HOME!! COMBUSTION AND VENTILATION AIR MUST BE PRO- THIS FURNACE IS NOT APPROVED FOR INSTALLATION VIDED TO THE FURNACE AS REQUIRED BY THE NA- IN A MOBILE HOME. DOING SO COULD CAUSE FIRE, TIONAL FUEL-GAS CODE (U.S.) AND CSA B149.1 PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
  • Page 7 SAFETY W RNING W RNING ALWAYS INSTALL THE FURNACE TO OPERATE WITHIN DUCT LEAKS CAN CREATE AN UNBALANCED SYSTEM THE FURNACE’S INTENDED TEMPERATURE-RISE AND DRAW POLLUTANTS SUCH AS DIRT, DUST, FUMES RANGE WITH A DUCT SYSTEM WHICH HAS AN EXTER- AND ODORS INTO THE HOME CAUSING PROPERTY NAL STATIC PRESSURE WITHIN THE ALLOWABLE DAMAGE.
  • Page 8 COMMONWEALTH OF MASSACHUSETTS NOTE IMPORTANT! THE COMMONWEALTH OF MASSACHU- 4. INSPECTION. The state or local gas inspector of the SETTS REQUIRES COMPLIANCE WITH REGULATION side wall horizontally vented gas fueled equipment shall 248 CMR 4.00 AND 5.00 FOR INSTALLATION OF not approve the installation unless, upon inspection, the THROUGH-THE-WALL VENTED GAS APPLIANCES AS inspector observes carbon monoxide detectors and sig-...

  • Page 9: Location Requirements

    LOCATION REQUIREMENTS GENERAL INFORMATION or CSA listed heat tape or UL or CSA approved heating W RNING cable with a rating of 3-6 watts per foot is acceptable pro- tection when installed and maintained in accordance with WHEN THIS FURNACE IS INSTALLED IN A RESI- the manufacturer’s instructions.
  • Page 10 LOCATION REQUIREMENTS GENERAL INFORMATION (cont.) W RNING W RNING DO NOT LIFT THE UNIT BY THE HEAT EXCHANGER COMBUSTIBLE MATERIAL MUST NOT BE TUBES. DOING SO CAN DAMAGE THE HEAT EX- PLACED ON OR AGAINST THE FURNACE CHANGER ASSEMBLY. JACKET. THE AREA AROUND THE FURNACE MUST BE KEPT CLEAR AND FREE OF ALL COM- CLEARANCE –...
  • Page 11 FIGURE 5 UNIT DIMENSIONS (CLEARANCE TO COMBUSTIBLES – SOME MEASUREMENTS DO NOT APPLY TO UPFLOWS)
  • Page 12 FIELD CONVERSIONS GENERAL CONVERSION INSTRUCTIONS CONDENSATE PVC/HOSE OPTIONS CONVERSION AND INSTALLATION CONSIDERATIONS BULKHEAD COUPLING CONDENSATE DRAINIAGE HAS OPTIONS FOR 3/4" OR 1/2" ALL CONVERSIONS REQUIRE THE CONDENSATE PLUMBING TO PVC CONNECTIONS. THE BULKHEAD COUPLING CONNECTS THE HAVE DECLINE IN THE DIRECTION OF THE WATER FLOW. RUBBER HOSES FROM INSIDE THE UNIT TO THE PVC PIPE EXTERIOR OF THE UNIT.
  • Page 13 FIELD CONVERSIONS GENERAL PARTS REQUIRED FOR CONVERSIONS PARTS BAG (PROVIDED WITH UNIT) (X2) (X2) (X3) 2" PVC VANE INTAKE BULKHEAD INTAKE AIR HOSE CLAMP 1/4" HOLE #8 X 1/2" COUPLING DIFFUSER COUPLING PLUG SCREW TUBE C HOSE DOUBLE ELBOW CONVERSION KIT RXGY-CK (X4) 2"...
  • Page 14 FIELD CONVERSIONS FIELD CONVERSION TO V RIOUS CONFIGUR TIONS Furnaces can be converted to two different upflow configurations as follows. There are two different venting options, including a zero-clearance option, to give the installer flexibility in locating the venting for this furnace. LISTS OF MATERIALS FOR PARTS BAGS AND CONVERSION KITS.
  • Page 15 UPFLOW VERTICAL VENT PARTS NEEDED: PARTS NEEDED FOR THIS CONVERSION REQUIRE ITEMS INSTALL FROM THE PARTS BAG ONLY. NO OTHER CONVERSION KITS ARE NEEDED. FROM PARTS BAG (PROVIDED WITH UNIT) TUBE C HOSE - DOUBLE ELBOW BULKHEAD INTAKE HOSE #8 X 1/2" COUPLING COUPLING CLAMP...
  • Page 16 Checklist: VERIFY ALL HOSES ARE SECURE AND FULLY SEATED. CONFIRM THAT ALL HOSES ARE FREE OF KINKS. CONFIRM ALL HOSES AND OTHER DRAIN PARTS HAVE A SLOPE IN DIRECTION OF WATER FLOW BOTH WORM DRIVES ON THE HOSE CLAMPS OF THE IDB COUPLING MUST BE LOCATED ON THE TOP OF THE COUPLING.
  • Page 17 UPFLOW LEFT VENT PARTS NEEDED: FROM PARTS BAG (PROVIDED W/UNIT) FROM CONVERSION KIT RXGY-CK PARTS NEEDED FOR THIS CONVERSION REQUIRE THE (X2) (X3) OUTLINED ITEMS FROM THE PARTS BAG AND CONVERSION KIT RXGY-CK. YOU BULKHEAD HOSE INTAKE #8 X 1/2" MUST HAVE THESE PARTS BEFORE COUPLING COUPLING...
  • Page 18 TUBE C CUT TO FIT HOSE-DOBLE CABINET WIDTH ELBOW (X2) HOSE A TUBE C - RIGHT SIDE DRAIN OPTION 5b1 - CUT TUBE “C” TO FIT CORRESPONDING CABINET WIDTH. 5b2 - INSERT TUBE “C” INTO END “2” OF HOSE- DOUBLE ELBOW HOSE A 5a - LEFT SIDE DRAIN OPTION 5b3 - SLIDE TWO WIRE CLAMPS OVER TUBE “C”, SLIDE ONE WIRE CLAMP OVER...
  • Page 19 DUCTING External filter racks are available from the distributor. Use FIGURE 6 the following part numbers when ordering: REMOVE SOLID BASE PANEL FROM THE TOP BEFORE INSTALLING FURNACE RXGF-CA External Side Filter Rack Kit RXGF-CB External Bottom Filter Rack Kit Proper air flow is required for the correct operation of this REMOVE SOLID furnace.
  • Page 20 DUCTING W RNING UPFLOW FURNACE: THE SOLID METAL BASE PLATE (SHIPPED WITH THE FURNACE) MUST BE IN- STALLED IN THE FURNACE BOTTOM WHEN USING SIDE AIR RETURN. FAILURE TO INSTALL A BASE PLATE COULD CAUSE THE PRODUCTS OF COM- BUSTION TO CIRCULATE INTO THE LIVING SPACE AND CREATE POTENTIAL LY HAZARDOUS CONDI- TIONS, INCLUDING CARBON MONOXIDE POISON- ING OR DEATH.
  • Page 21 DUCTING FIGURE 8 FIGURE 9 AS - SHIPPED FLAT INSTALLER BENT - UP INSTALLER BENT - UP ALTERNATE - BENT (DOWN) CUT - OUT USING EMBOSSED ANGLES AS A GUIDE FOR PROPER SIZE 23” x 14” ST-A1194-04-X0 NOTES: THIS VIEW IS REPRESENTATIVE OF BOTH SUPPLY AND RETURN OPENINGS.
  • Page 22 GENERAL VENTING REQUIREMENTS AND GUIDELINES VENTING & COMBUSTION AIR REQUIREMENTS The following types of installations (but not limited to the following) may require outdoor air for combustion (direct vent) due to chemical exposures: Commercial buildings Buildings with indoor pools Furnaces installed in laundry rooms Furnaces in hobby or craft rooms Furnaces installed near chemical storage areas...
  • Page 23 GENERAL VENTING REQUIREMENTS AND GUIDELINES VENTING & COMBUSTION AIR REQUIREMENTS (cont.) IMPORTANT: ONLY THE CURRENT VENT INSTRUC- TIONS APPLY. All 90 Plus Gas Furnaces cannot be com- edition of the National Fuel Gas Code, NFPA-54/ANSI Z223.1, CSA B149.1; Canadian Natural Gas and Propane OVERTEMPERATURE SAFETY Installation Code (Canada), local codes or ordinances mon-vented.

  • Page 24: Cementing Joints

    GENERAL VENTING REQUIREMENTS AND GUIDELINES VENTING & COMBUSTION AIR REQUIREMENTS (cont.) installed per the manufacturer’s instructions. NOTE: All pipe, fittings, solvent cement, primers and procedures must be installed following the vent manufacturer’s instal- Never cover heat tape with insulation. 6. IMPORTANT: No part of the combustion air and/or lation instructions and must conform to American National 5.
  • Page 25 GENERAL VENTING REQUIREMENTS AND GUIDELINES VENT PIPE SIZING AND MAXIMUM VENT LENGTHS EQUIVALENT VENT LENGTHS The concept of equivalent vent lengths is frequently used in piping systems to account for pressure drop of fittings, such as elbows. The equivalent length of a fitting is the length of a straight section of pipe that has an equivalent pressure drop in the application as the fitting used.
  • Page 26 GENERAL VENTING REQUIREMENTS AND GUIDELINES VENT PIPE SIZING AND MAXIMUM VENT LENGTHS (cont.) TABLE 3: MAXIMUM EQUIVALENT VENT LENGTH (-)97VA060M317USA (-)97VA070M317USA (-)97VA085M521USA (-)97VA100M521USA (-)97VA115M524USA * This is the recommended maximum number of long sweep elbows for either 2 or 3 inch pipe. Combinations of long sweep 90s, standard 90s, or 45s may be used, but the manufacturer recommends the use of long sweep 90s whenever possible because the use of the maximum number of standard 90 and 45 elbows only may result in nuisance furnace outages due to individual installation specifics.
  • Page 27 GENERAL VENTING REQUIREMENTS AND GUIDELINES VENT PIPE SIZING AND MAXIMUM VENT LENGTHS (cont.) POLYPROPYLENE VENT PRODUCTS bles 4 and 5 below. These manufacturers have provisions Centrotherm brand Innoflue and Duravent Polypro Single- for B-vent liners and chimney liners which can be used with this furnace with non-direct venting applications only.
  • Page 28 GENERAL VENTING REQUIREMENTS AND GUIDELINES TERMINATION REQUIREMENTS pliance or clothes dryer to prevent recirculation of the THE COMBUSTION PRODUCTS AND MOISTURE flue gases into the furnace combustion air inlet. The IN THE FLUE GASES WILL CONDENSE AS THEY only exception to this requirement is the case of multi- LEAVE THE TERMINATION.
  • Page 29 GENERAL VENTING REQUIREMENTS AND GUIDELINES NON-DIRECT VENT (VERTICAL TERMINATIONS ONLY) FURNACE LOCATED IN AN UNCON- FINED SPACE (U.S. INSTALLATIONS) USING INDOOR AIR FOR COMBUSTION: ALL FURNACE INSTALLATIONS MUST COMPLY WITH THE NATIONAL FUEL GAS CODE, NFPA 54, AND IN CANADA CSA B149.1; CANADIAN NATURAL GAS AND 1,000 BTUH of total input for all appliances in the space.
  • Page 30 GENERAL VENTING REQUIREMENTS AND GUIDELINES NON-DIRECT VENT (cont.) B. USING OUTDOOR AIR FOR COMBUSTION: IMPORTANT: Do not take air from an attic space that is A. Where directly communicating with the outdoors through vertical ducts as shown in Figure 12, each opening shall have an opening or where communicating to the outdoors through equipped with power ventilation.
  • Page 31 GENERAL VENTING REQUIREMENTS AND GUIDELINES NON-DIRECT VENT (cont.) FIGURE 12 FIGURE 13 NON-DIRECT VENT AIR FROM NON-DIRECT VENT ATTIC OR CRAWL SPACE OUTSIDE AIR USING A HORIZONTAL DUCT OUTLET AIR 1 SQ. IN. (6.5 SQ. CM.) PER 2000 BTUH INLET AIR 1 SQ. IN. (6.5 SQ.
  • Page 32 GENERAL VENTING REQUIREMENTS AND GUIDELINES NON-DIRECT VENT (cont.) B. Not less than the sum of the areas of all vent connectors in the confined space. If the unit is installed where there is an exhaust fan, sufficient ALL VENTS INSTALLED THROUGH UNCONDI- ventilation must be provided to prevent the exhaust fan from TIONED SPACE WHERE BELOW-FREEZING TEM- creating negative pressure.

  • Page 33: Direct Vent

    GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT DIRECT-VENT (2-PIPE) INSTALLATIONS ALL FURNACE INSTALLATIONS MUST COMPLY WITH THE NATIONAL FUEL GAS CODE OR, IN CANADA, CSA B149.1; NATURAL GAS AND The field-supplied vent system used for direct-vent instal- PROPANE INSTALLATION CODE AND LOCAL lations uses 2 pipes;...
  • Page 34 GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT (cont.) Figure 17 below shows the necessary detail for the roof penetration on a standard direct-vent vertical termination. FIGURE 17 DIRECT VENT VERTICAL TERMINATION DETAIL Terminations more than 24” above roof penetration re- quire additional support.
  • Page 35 GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT (cont.) OPTION 2: STANDARD HORIZONTAL DIRECT-VENT TERMINATION FIGURE 18 STANDARD HORIZONTAL DIRECT VENTING SEE DETAIL B FOR DIMENSION BETWEEN INTAKE AND EXHAUST SEE DETAIL A COUPLINGS: REQUIRED ON EXTERIOR, OPTIONAL ON INTERIOR 1) SUPPORT HORIZONTAL PIPE EVERY FOUR FEET. 2) WHEN 3”...
  • Page 36 GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT (cont.) OPTION 4: ALTERNATE HORIZONTAL DIRECT-VENT TERMINATION NOTE: FIGURE 20 A TRAP MUST BE IN- STALLED IN THIS OPTION TYPICAL HORIZONTAL VENTED 2 PIPE TERMINALS TO PREVENT WATER FROM ENTERING THE FURNACE NOTE: THROUGH THE COMBUS- 1) FOR EXHAUST / INTAKE PENETRATION TION AIR PIPE.
  • Page 37 GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT (cont.) OPTIONAL TERMINATION ANGLES FOR OPTION FOR ALT. HORIZ. AND VARIANT OF ALT. HORIZ. DIRECT-VENT TERMINATIONS (OPTIONS 4 &5) NOTE: THESE OPTIONAL TERMINATION ANGLES 4. MARK THE FINAL (22° OR 45°) ANGLES ON THE TOP OF THE VERTICAL RISERS AND FINAL EL- APPLY ONLY TO DIRECT-VENT TERMINATION OP- BOWS BEFORE GLUING INTO PLACE TO ENSURE...
  • Page 38 GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT (cont.) OPTIONS 6 & 7: VERTICAL OR HORIZONTAL CONCENTRIC VENT TERMINATION FOR 2” PIPE: RXGY-EO2 (U.S. ONLY) OR RXGY-EO2A (U.S. AND CANADA) FOR 3” PIPE: RXGY-EO3 (U.S. ONLY) OR RXGY-EO3A (U.S. AND CANADA) CONCENTRIC TERMINATIONS NOTE: Maximum equivalent lengths specified in the 3”...
  • Page 39 GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT (cont.) OPTIONS 8 & 9: 2 & 3 SIDE WALL VENT TERMINATIONS (Figures 24 & 25) FOR 2 PIPE: RXGY-G02 FOR 3 PIPE: RXGY-G01 This termination is for horizontal venting only. This termi- NOTE: With this option a trap on the inlet combustion NOTE: Install the vent and air intake piping into the vent air pipe is NOT required.

  • Page 40: Vent Termination Clearances

    GENERAL VENTING REQUIREMENTS AND GUIDELINES DIRECT VENT TERMINATION CLEARANCES Figure 26 shows minimum clearances that must be used for direct venting terminations. VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA FIGURE 26 DIRECT VENT TERMINAL CLEARANCES INSIDE CORNER DETAIL Fixed...
  • Page 41 GENERAL VENTING REQUIREMENTS AND GUIDELINES MULTIVENTING OF DIRECT-VENT FURNACES Figures 27 & 28: NOTE: WHEN VENTING MULTIPLE FURNACES IN CLOSE PROXIMITY, EACH FURNACE MUST BE INDIVIDUALLY VENTED – NO COMMON VENTING IS PERMITTED. See Figures 27 & 28 for positioning of the naces and the third and etc.

  • Page 42: Condensate Drain

    CONDENSATE DRAIN CONDENSATE DRAIN & DRAIN NEUTRALIZER GENERAL INFORMATION B. FURNACE SHUTOFF – When the top of the vent tube is above the elevation of the LOWER condensate water level sensor (aka electronic water level sensor), the furnace will be shut off in the event of a blocked drain and no heat will be provided.
  • Page 43 CONDENSATE DRAIN CONDENSATE DRAIN & DRAIN NEUTRALIZER (cont.) FIGURE 29 CONDENSATE DRAIN LOCATING INSTRUCTIONS NOTE: THIS IMAGE INTENTIONALLY DEPICTS A GENERIC VIEW OF THE DRAIN ROUNTING, THE INSTALLER HAS THE OPTION TO ROUTE THE DRAIN TO THE RIGHT OR LEFT OF THE FURNACE AS NEEDED.
  • Page 44 GAS SUPPLY GAS SUPPLY AND PIPING NATURAL GAS AND PROPANE IMPORTANT SAFETY INFORMATION AND WILL RISE, POSSIBLY ACCUMULATING IN (LIQUEFIED PETROLEUM GAS / LPG) HIGHER PORTIONS OF THE STRUCTURE. SAFETY • IF A GAS LEAK IS PRESENT OR SUSPECTED: - DO NOT ATTEMPT TO FIND THE CAUSE YOUR- SELF.
  • Page 45 FIGURE 30 GAS PIPING INSTALLATION THIS FURNACE IS EQUIPPED AT THE FACTORY UPFLO UPFLOW FOR USE ON NATURAL GAS ONLY. CONVERSION TO LP GAS REQUIRES A SPECIAL KIT IS AVAIL- ABLE AT THE DISTRIBUTOR. FAILURE TO USE THE MANUAL SHUT OFF VALVE PROPER CONVERSION KIT CAN CAUSE FIRE, (4-5 FT.

  • Page 46: Gas Pressure

    GAS SUPPLY GAS PRESSURE IMPORTANT: Do not run a flexible gas connector inside FIGURE 31 the furnace. The gas pipe gasket in the cabinet does not seal around a flexible gas line. If local codes allow the use of a flexible gas appliance connector, always use a new listed connector.

  • Page 47: Gas Valve

    2. NOTE: Order the correct LP conversion kit from the furnace manufacturer. Furnace conversion to LP gas must be performed by a qualified installer, service NEVER PURGE A GAS LINE INTO THE COMBUS- agency or the gas supplier. TION CHAMBER. NEVER USE MATCHES, FLAME 3.
  • Page 48 W RNING FIGURE 34 LP JUMPER INSTALLED ON SERVO MODULATING GAS VALVE WITH PINS TURN OFF ELECTRIC L POWER ND M IN G S NOT CONNECTED. THIS IS INCORRECT. MAKE SURE THAT THE JUMPER SUPPLY BEFORE BEGINNING MODIFIC TION. CONNECTS THE TWO PINS TOGETHER AND VERIFY MANIFOLD GAS PRESSURE AT HIGH FIRE TO MAKE SURE THE VALVE IS PROPERLY CON- F ILURE TO DO SO C N RESULT IN ELECTRIC L VERTED FOR LP GAS...
  • Page 49 NOTE: 1.10 mm orifices provided in kit are used in all alti- FIGURE 36 tudes. These orifices comply with the 2% de-rate require- ments due to the natural de-rate related to lower barometric pressure. NOTE: Use a pipe compound resistant to the action of the liq- uefied petroleum gases at all threaded pipe connections.
  • Page 50 FURNACE ADJUSTMENTS The following pages will cover in detail how to select the ft. All other elevations and heating values will require proper orifice, adjust the manifold pressures (at min and changing orifices and possibly input rate. max firing rates), verify the rate and set the proper temper- A.
  • Page 51 LP GAS ORIFICE SELECTION erly calibrated manometer is required for accurate gas pres sure measurements. For LP Orifice selection, refer to the “LP Conversion” sec- E. Order Orifices: tion of this manual. If the supply gas line pressure is above these ranges, in - stall an in-line gas regulator to the furnace for natural gas units.
  • Page 52 FURNACE ADJUSTMENTS 2. Connect a manometer to the pressure tap. FIGURE 41 3. Turn on the gas supply and operate the furnace at SERVO CONTROLLED GAS VALVE PRESSURE ADJUSTMENT 100% and all other gas-fired units on the same gas line as the furnace. 4.
  • Page 53 The adjustment wheel is shipped from the factory in 2. Install field supplied pressure tap to the outlet/manifold the nominal position (noted as position A on the tap in place of the plug. Connect the positive pressure Wheel). The wheel can be adjusted four full revolu- hose from a manometer to the pressure tap.
  • Page 54 FURNACE ADJUSTMENTS 9. Check outlet/manifold gas pressure. Gas Rate (ft /hr) w 1ft /Rev Meter = (3600)/(36 Sec- onds) 10. Repeat steps 8 and 9 if needed. Gas Rate = 100 ft /Hour 11. Remove jumper across R and W1 to remove heat call and allow blower to finish off delay.

  • Page 55: Temperature Rise

    STEP 4: ADJUST GAS HEAT TEMPERATURE RISE TABLE 15 GAS RATE (FT /HOUR) COMFORT/EFFICIENCY SELECT: One dipswitch SW18 is provided to allow for selection be- tween Comfort and Efficiency mode as follows: SW18 = OFF = Comfort Mode, Target Temp Rise = +10°F above Nameplate Mid-Rise SW18 = ON = Efficiency Mode, Target Temp Rise = Mid- rise as specified on Nameplate Label...

  • Page 56: Temperature Rise Check

    FURNACE ADJUSTMENTS Further, for communicating systems, the above selections 4. When the thermometer in the supply air duct stops ris- (made with dipswitches SW13, SW14, SW15, and SW16 ing (approximately 5 minutes), subtract the return air in legacy mode) can be made via the Econet control cen- temperature from the supply air temperature.
  • Page 57 THE MEASURED TEMPERATURE RISE SHOULD BE TYPICAL FURNACE NAME PLATE AS CLOSE TO THE MIDDLE OF THE STATED RANGE AS POSSIBLE. FOR EXAMPLE, IF THE RISE RHEEM SALES COMPANY, INC. FORT SMITH, ARKANSAS CANADIAN ENERGY RANGE IS 40°F TO 70°F (4.5° - 21°C), THE MIDDLE...
  • Page 58 CSA - International 5060 Spectrum Way Mississauga, Ontario TURN OFF ELECTRIC POWER AT FUSE BOX OR Canada L4W 5N6 SERVICE PANEL BEFORE MAKING ANY ELECTRI- online: www.csa.ca CAL CONNECTIONS. FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PER- FIGURE 44 SONAL INJURY OR DEATH.

  • Page 59: Electrical Wiring

    ELECTRICAL WIRING REVERSING ELECTRICAL CONNECTION & THERMOSTAT NOTE: Do not use 24 volt control wiring smaller than No. 18 AWG. 4. Remove 7/8” plug from hole opposite j-box location. Drill 2 @ 3/16” Ø holes in the jacket. NOTE: Dim- Install the room thermostat in accordance with the instruc- ples/marks are provided in the sheet metal for correct tion sheet packed in the box with the thermostat.
  • Page 60 ELECTRONIC AIR CLEANER HUMIDIFIER Line voltage power can be supplied from the terminal la- Humidifier output is a set of dry contacts. The logic control- beled “EAC” and a line voltage neutral terminal on the ling these contacts and the necessary wire diagrams for in- control board.
  • Page 61 FIELD INSTALLED OPTION ACCESSORIES (cont.) FIGURE 46 UPFLOW/HORIZONTAL FILTER LOCATIONS RXGF-CB RXGF-CB ACCESSORT FILTER RACK ACCESSORY FILTER RACK ST-A1194-10-X0 SIDE RETURN FLANGE WRAPS AROUND BACK AND SCREWS TO THE REAR OF THE FURNCE, AT THE LOCATIONS PROVIDED CUT - OUT USING EMBOSSED ANGLES AS A GUIDE FOR PROPER SIZE 23”...

  • Page 62: To Start The Furnace

    COMMUNICATING FURNACE cycle with heating fire rate fixed at 40%. The voltage at the terminal labeled "V/W2" will be ignored. This furnace is equipped with a direct ignition control. 13. Replace the burner compartment control access door. Each time the room thermostat calls for heat, the igniter lights the main burners directly.
  • Page 63 START-UP AND SEQUENCE OF OPERATIONS 7. Low pressure switch fails to open after dropping switches are open at the beginning), the IFC will finish the speed to the minimum RPM value during the calibra- cold calibration even if the gas heat call is removed during tion post-purge sequence.
  • Page 64 of the mid pressure switch is completed. Also, a new cali- calibration sequence has been skipped for reasons stated, bration sequence will be executed on the next heat cycle. the inducer speed is then increased from the value at which the mid pressure switch closed. The furnace control Provided the mid pressure switch is open, the furnace will first verify that the inducer drive is operating at the cor- control will continue increasing the inducer RPM in dis-...
  • Page 65 START-UP AND SEQUENCE OF OPERATIONS quence will be executed on the next heat cycle. period (per ANSI Z21.47, definition section)). The IFC continues the pressure switch proving sequence Trial for Ignition Period (TFI) = 8 seconds (TFI = The pe- by energizing the inducer at the rpm determined for the riod of time between energizing and de-energizing the gas high pressure switch during cold calibration and waits for...
  • Page 66 HUMIDIFICATION/DEHUMIDIFICATION switch calibration sequence unless the mid pressure Upon proving flame from successful ignition, the IFC con- switch malfunctioned during cold calibration (in which tinues in the following way: case, hot mid pressure switch calibration will be 1. If Calibration Cycle is active: skipped).The inducer RPM is decreased steadily and the The IFC proceeds to the Warm Calibration.
  • Page 67 INTEGRATED FURNACE CONTROL FIGURE 47 FURNACE CONTROL BOARD OR IFC (INTEGRATED FURNACE CONTROL)
  • Page 68 b. Post-Purge after Non-Calibration Heat Call: for transmit and a green LED (labeled RX) is provided for receive. These LED’s will be lit in an undefined Post-purge after any heat sequence which is not a calibra- pattern when other communicating components are tion sequence shall take place at the same inducer speed attached and communicating with the furnace control.
  • Page 69 HUMIDIFICATION/DEHUMIDIFICATION FIGURE 48 ELECTRONIC AIR CLEANER AND HUMIDIFIER TERMINALS 2.) The humidistat must determine that there is a need for A. HUMIDIFICATION CONTROL ONLY WITH NO humidification. DEHUMIDIFICATION (REQUIRES OPTIONAL HUMIDIFIER). Note: Dipswitch S2-8 (labeled “ODD”) enables(“ON”) or disables (“OFF”) de-humidification operation. A1.
  • Page 70 HUMIDIFICATION/DEHUMIDIFICATION A2-2 CONTROLLED HUMIDIFIER OPERATION USING “ON” position. If this switch is not turned “ON”, A HUMIDISTAT (REQUIRES OPTIONAL HUMIDISTAT). dehumidification operation will not take place. Further, if this switch is “ON” and no humidistatis installed, airflow in Controlled humidification can be accomplished using a cooling will be permanently reduced by approximately humidistat as shown in Figures 50 or 51.
  • Page 71 HUMIDIFICATION/DEHUMIDIFICATION C2. WITH NON-COMMUNICATING THERMOSTAT installation of a humidifier with external and internal power (REQUIRES OPTIONAL HUMIDISTAT) supplies respectively. Dehumidification operation will be disabled if the dipswitch S2-8 is in the “OFF” position. If For non-communicating thermostats, an optional this switch is in the “ON” position, dehumidification control humidistat must be installed.
  • Page 72 11. COMMUNICATING ECM MOTOR HIGH COOL SELECTIONS: COMMUNICATIONS (CONTROL) CONNECTION ½ HP Blower ¾ HP Blower (P4) (56 & 70 KBTU) (84, 98 &112 KBTU) This connector sends and receives messages to and OFF* 1050 CFM 1750 CFM from the blower motor through a single peer-to-peer 875 CFM 1400 CFM network.
  • Page 73 12. DIPSWITCHES DIPSWITCHES FIGURE 53 DIPSWITCH MAP...
  • Page 74 One dipswitch (SW8) is provided to enable the dehumidification feature in legacy mode. Selections are as follows: SW8=OFF ODD not enabled. (Factory Setting) SW8=ON ODD enabled. 0VAC on “HUM STAT” will decrease airflow in cooling. Tandem Airflow Select; SW9 One dipswitch (SW9) is provided to select the percentage of airflow for the base first stage cooling airflow in legacy mode.
  • Page 75 INTEGRATED FURNACE CONTROL MODEL DATA CARD When both Mode dipswitches are set to the “ON” position, Heat Blower Off Delay; SW17 the furnace operates as normal to a modulating heat call One dipswitch (SW17) is to be provided for heat blower off (“W1”...
  • Page 76 DUAL SEVEN SEGMENT DISPLAY this case a capital “H” shall be displayed and not a lower-case “h”. 2. Low pressure switch fails 5 times in one heat call. DO NOT REPLACE THE FURNACE CONTROL OR Then device is forced to the high rate to reveal possi- MEMORY CARD OF THE FURNACE WITH A ble Water Sensed condition.
  • Page 77 DUAL SEVEN SEGMENT DISPLAY 6. While the control is in one-hour lockout due to an 11. When IFC is in soft lockout and fault “93” is active, unexpected flame, the fault codes “14” (unexpected the fault code “93” is to be displayed alternately with flame) and “10”...
  • Page 78 INTEGRATED FURNACE CONTROL PUSHBUTTON 15. PUSHBUTTON (S8) Activation of IFC Status Menu DISPLAY CODES The status mode is entered when the pushbutton is pressed for less than 2 seconds. While in the Status menu Description at the seven segment displays, the CATEGORY FIELD is displayed first for one second immediately followed by the appropriate value for one second.
  • Page 79 INTEGRATED FURNACE CONTROL PUSHBUTTON Note: In case of active dual faults – e.g. typical for pres- Fire rate display sure switch faults, where fault "57" and "45" can be active Gas heat fire rate is displayed for 1 second as follows: and become promoted at the same time –...
  • Page 80 INTEGRATED FURNACE CONTROL SUPPLY AND OUTDOOR AIR TEMPERATURE SENSORS 16. SUPPLY AND OUTDOOR AIR TEMPERATURE If the resistance between the outdoor air terminals (OAT) SENSOR INPUTS (T4) see Figure 54 is determined to be out of range to a high resistance, it shall be interpreted as an uninstalled supplied outdoor air Optional field-installed supply air and outdoor air sensors sensor and shall not cause an error condition unless a...
  • Page 81 INTEGRATED FURNACE CONTROL AUXILIARY INPUTS FIGURE 54 WIRING OF SUPPLY AIR (SA) AND OUTDOOR AIR (OAT) TEMPERATURE SENSORS. NOTE: SUPPLY AIR SENSOR MUST NOT ST-A1194-63 (BOTTOM) BE IN DIRECT LINE-OF-SIGHT TO ST-A1194-63-01 THE HEAT EXCHANGER. 17. AUXILIARY INPUTS (COMMUNICATING SYSTEMS heat-pump airflow, displaying active faults and ONLY) (T5) (SEE FIGURE 55) active furnace information at the thermostat and...
  • Page 82 THERMOSTAT INPUTS FIGURE 55 WIRING OF AUXILIARY INPUTS (USE WITH COMMUNICATING SYSTEMS ONLY). ST-A1194-63 (TOP) contiguous (have continuity) across all devices and all A. WIRING OF FULLY COMMUNICATING SYSTEMS. wire segments. This should be done by twisting the Figure 56 is the wiring diagram for connecting the furnace shielding wires from adjacent segments together.
  • Page 83 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-COMMUNICATING FIGURE 56 WIRING DIAGRAM FOR A FULLY COMMUNICATING SYSTEM. ST-A1217-01...
  • Page 84 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-CONDENSING UNIT (NON- COMMUNICATING FIGURE 57 FIGURE 54 WIRING DIAGRAM FOR NON-COMMUNICATING CONDENSER UNIT WITH COMMUNICATING FURNACE AND THERMOSTAT. WIRING DIAGRAM FOR NON-COMMUNICATIONG CONDENSER UNIT WITH COMMUNICATING FURNACE AND THERMOSTAT. A. WIRING DIAGRAM SPECIAL CONFIGURATION: COMMUNICATING THERMOSTAT AND FURNACE WITH NON-COMMUNICATING CONDENSER (SINGLE - STAGE ONLY CONDENSER)
  • Page 85 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-CONDENSING UNIT (NON- COMMUNICATING FIGURE 55 FIGURE 58 WIRING DIAGRAM FOR A LEGACY SINGLE-STAGE THERMOSTAT WITH AUTOSTAGING. WIRING DIAGRAM FOR LEGACY SINGLE-STAGE THERMOSTAT WITH AUTOSTAGING SINGLE-STAGE TWO-STAGE / MODULATING CONDENSER THERMOSTAT GAS FURNACE CONTROL UNIT (NON-COMMUNICATING) HUM STAT JUMPER...
  • Page 86 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-CONDENSING UNIT (NON- COMMUNICATING FIGURE 56 WIRING DIAGRAM FOR A LEGACY TWO-STAGE THERMOSTAT. FIGURE 59 WIRING DIAGRAM FOR A LEGACY TWO-STAGE THERMOSTAT TWO-STAGE TWO-STAGE / MODULATING CONDENSER THERMOSTAT GAS FURNACE CONTROL UNIT (NON-COMMUNICATING) HUM STAT ST-A1194-62-04 ST-A1194-62-04...
  • Page 87 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-CONDENSING UNIT (NON- COMMUNICATING D. SPECIAL CONFIGURATION – WIRING OF NON- COMMUNICATING HEAT-PUMPS WITH COMMUNICATING FURNACE AND THERMOSTAT (SEE FIGURE 60). FIGURE 60 FIGURE 57 WIRING DIAGRAM FOR NON-COMMUNICATING HEAT PUMPS WITH COMMUNICATING FURNACE AND THERMOSTAT WIRING DIAGRAM FOR NON-COMMUNICATIONG HEAT PUMPS WITH COMMUNICATING FURNACE AND THERMOSTAT.
  • Page 88 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-CONDENSING UNIT (NON- COMMUNICATING E. HEAT PUMP SYSTEMS W/LEGACY THERMOSTATS E1. WIRING OF A SINGLE-STAGE LEGACY E2. WIRING OF A TWO-STAGE LEGACY THERMO- THERMOSTAT WITH AUTOSTAGING SELECTED STAT (SEE FIGURE 62) (SEE FIGURE 61). GURE 58 FIGURE 61 ING DIAGRAM FOR A LEGACY SINGLE-STAGE THERMOSTAT WITH AUTOSTAGING.
  • Page 89 INTEGRATED FURNACE CONTROL THERMOSTAT WIRING DIAGRAMS-CONDENSING UNIT (NON- COMMUNICATING FIGURE 59 WIRING DIAGRAM FOR A LEGACY 2-STAGE THERMOSTAT. FIGURE 62 WIRING DIAGRAM FOR A LEGACY 2-STAGE THERMOSTAT TWO-STAGE / MODULATING GAS FURNACE CONTROL HUM STAT ST-A1194-93-01 19. 24VAC AND COMMON CONNECTIONS (E10/E11) 20.
  • Page 90 TIMING DIAGRAM Below are timing diagram for calibration (Table 16) and normal heat sequence (Table 16). These diagrams assume no faults are present during the heat call. TABLE 16 TIMING DIAGRAM FOR A CALIBRATION GAS HEAT SEQUENCE...
  • Page 91 TIMING DIAGRAM TABLE 17 TIMING DIAGRAM FOR NON-CALIBRATION GAS HEAT SEQUENCE...
  • Page 92 THESE INSTRUCTIONS ARE INTENDED AS AN AID TO FIRE, ELECTRICAL SHOCK, CARBON MONOXIDE POI- QUALIFIED SERVICE PERSONNEL FOR PROPER IN- SONING, EXPLOSION, PROPERTY DAMAGE, PER- STALLATION, ADJUSTMENT AND OPERATION OF THIS SONAL INJURY OR DEATH. UNIT. READ THESE INSTRUCTIONS THOROUGHLY BE- DISCONNECT MAIN ELECTRICAL POWER TO THE FORE ATTEMPTING INSTALLATION OR OPERATION.

  • Page 93: System Operation Information

    SYSTEM OPERATION INFORMATION ADVISE THE CUSTOMER or radios to influence the thermostat operation. 6. Except for the mounting platform, keep all combustible 1. Keep the air filters clean. The heating system will op- articles 3 feet from the furnace and vent system. erate better, more efficiently and more economically.
  • Page 94 Below are two lists; a list of standard operating codes and NOTE: Verify display orientation is correct before interpret- a list of fault codes. The fault code list provides diagnostic ing fault codes. Otherwise, the fault codes may be upside- and troubleshooting information to help determine the down.

  • Page 95: Fault Codes

    TABLE 19 R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS FAULT CODES DISPLAYED TEXT STATUS FAULT CODE DISPLAYED DESCRIPTION AT DUAL SEVEN- EXPECTED OPERATION SEGMENT DISPLAY OF CAUSE CONTROL SOLUTION FAULT CODES NO MODEL DATA STATUS: This is a critical fault. The furnace will not operate in any mode. DESCRIPTION: This code is displayed anytime there is no model data at the furnace.
  • Page 96 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS ONE-HOUR LOCKOUT STATUS: This is a critical fault. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should function. DESCRIPTION: This fault is displayed under the following conditions: 1.
  • Page 97 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS LOW FLAME SENSE STATUS: The status of this fault is non-critical and furnace operation will continue as normal in heating (and all other) mode(s). If flame sense is low, the furnace control (or I.F.C.) may soon no longer be able to properly sense the flame and status of the problem may be elevated to the level of fault code "13"...
  • Page 98 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS...
  • Page 99 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS OPEN FUSE STATUS: This is a critical fault. The furnace will not operate in any mode. DESCRIPTION: The fuse has been opened. This usually occurs when there is a 24VAC short to common or ground on the low- votage side of the transformer.
  • Page 100 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS LOW PRESSURE SWITCH OPEN, INDUCER ON HIGH SPEED STATUS: This is a critical fault. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should function if present simultaneously with a heating call (e.g.
  • Page 101 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS HIGH PRESSURE SWITCH CLOSED, INDUCER OFF STATUS: This is a critical fault. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should function if present simultaneously with a heating call (e.g. defrost call in dual-fuel mode). DESCRIPTION: The high pressure control (or switch) should not be closed when the inducer is not running.
  • Page 102 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS WATER SENSED STATUS: This is a critical fault experienced by the furnace. The furnace will not operate in gas heat modes but all other modes (e.g. cooling) should function if a call is present. DESCRIPTION: The IFC has detected current flowing from pin(s) 1 and/or 2 of connector P4 of the furnace control.
  • Page 103 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS E5-4F81''7814'G5<!H4!;?'1-I4'H?7;-4B14?F16 '*"*#$&$$H5)2$)2$&$+.+I4*)-)4&:$9&3:-6$$H51$93*+&41$()::$.01*&-1$)+$,&2$51&-$/.'12$=3-$,&2$51&-$9)*)+,$*&-1$'1/&+'2$9*./$-51$-51*/.2-&-$ =1-(11+$FMP$&+'$QFP$()::$.01*&-1$&-$RMP$)+2-1&'6 -%$./+0*+(,&$$H5)2$9&3:-$)+')4&-12$-5&-$-51$/)'$0*1223*1$2()-45$)2$1:14-*)4&::?$4:.21'$(51+$)-$25.3:'$=1$.01+6 120%.*%34(0%/"*+(,K$$N&2$51&-)+,$()::$0*.411'$&2$+.*/&:$1O410-$9)*)+,$*&-12$=1-(11+$FMP$&+'$QFP$()::$=1$9)O1'$-.$RMP$=?$-51$ 93*+&41$4.+-*.:6 !"#$%& !"#$%&'$()*)+,$-.$/)'$0*1223*1$2()-456 !7#$%&'$/)'$0*1223*1$2()-456 !8#$%&'$93*+&41$4.+-*.:6 '()#*+(,& !"#$;514<$()*)+,$&+'$4.+++14-).+2$=1-(11+$/)'$0*1223*1$2()-45$&+'$93*+&41$4.+-*.:6$$;.**14->*10:&41$&2$+14122&*?6 !7#$@10:&41$/)'$0*12223*1$2()-456 !8#$@10:&41$A3*+&41$4.+-*.:6 BLOWER CUTBACK STATUS: This is a non-critical fault experienced by the furnace. All operations (including thermostat calls) should continue as normal with no perceivable difference in operation.
  • Page 104 TABLE 19 (continued) R97V FAULT CODES WITH DESCRIPTIONS AND SOLUTIONS NO BLOWER COMMUNICATIONS STATUS: This is a critical fault. The furnace will not operate in any mode. DESCRIPTION: The furnace control (I.F.C.) can not communicate with the blower motor. EXPECTED OPERATION: If the furnace was in heating operation when this fault occurred, the gas valve will immediately close (flame will be lost), IBM (Indoor Blower Motor) operation will immediately stop and the furnace will shut down normally (except without IBM operation) with IDM (Induced Draft Motor) post-purge at the correct speed.
  • Page 105 All lockout conditions can be cleared immediately provided 3. The furnace control will declare that the blower motor is that the original fault causing the lockout is cleared and inoperable (dead) if the main limit control has been open power to the unit is cycled off and then back on again or for more than 150 seconds.
  • Page 106 )#+!:*!&"%$*'&*7"..*!/2/#(*(0/*6,+6&'/*&2*+/(#"%"%$*(0/*5/5&+9*)#+!*;*70")0*)&,.!* ./#!*(&*#*.&''*&2*)+"(")#.*!#(#*%/)/''#+9*(&*&6/+#(/*(0/*2,+%#)/:**(0/*)#+!*5,'(*'(#9* 7"(0*(0/*2,+%#)/*;*/3/%*70/%*(0/*2,+%#)/*)&%(+&.*<"2)=*5,'(*-/*+/6.#)/!:**%/3/+*,'/*#* )&%(+&.*-&#+!*(#1/%*2+&5*#%&(0/+*2,+%#)/*#'*#*+/6.#)/5/%(*)&%(+&.*2&+*(0"'* 2,+%#)/:*2,+%#)/*)&%(+&.'*(#1/%*2+&5*&(0/+*2,+%#)/'*5#9*)&%(#5"%#(/*(0/*'9'(/5* 1. MOTOR POWER AND COMMUNICATIONS IS- B. Remove the motor control connector from the fur- 7"(0*(0/*7+&%$*5&!/.*!#(#*70")0*)#%*&%.9*-/*2">/!*-9*+/6.#)"%$*(0/*5/5&+9*)#+!* SUES (FAULT CODE “68”) nace control at P5 and apply 24VAC to pins 3 & 4 7"(0*(0/*&+"$"%#.*5/5&+9*)#+!*2+&5*(0/*&+"$"%#.*2,+%#)/*&+*#*+/6.#)/5/%(*5/5&+9* (see photo). With the door switch closed (motor Is the motor communicating properly with the furnace )#+!*!/'"$%/!*2&+*(0/*&+"$"%#.*2,+%#)/:* powered) and 24VAC on pins 3 &...
  • Page 107 .%)!%0#(')*.1^!7#(*-?!)6')!)6#!2%.)(%$!&*(*.1!8#)&##.!)6#!9%)%(!'./!-3(.'2#!2%.)(%$!@)%! _ZA!*+!1%%/!'./!)6')!'$$!)6#!0*.+!%.!8%)6!#./+!'(#!-3$$?!+#')#/4!!\-!)6#!&*(*.1!2%..#2)*%.+! B. Is the motor set-screw not tightened to the motor $%%>+!1%%/^!'./!)6#!9%)%(!+)*$$!&*$$!.%)!%0#(')#^!)6#!9%)%(!$*>#$?!.##/+!)%!8#!(#0$'2#/4! shaft? This may cause erratic motor operation and cause the furnace to display a “66” fault code. Further, airflow will be low or air may not be mov- ing at all.
  • Page 108 CM 0716...

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