Allied A97US2V045B12S Service Manual
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Allied A97US2V045B12S Service Manual

Gas furnace with 107046-xx control
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SERVICE MANUAL
A97US2V Gas Furnace with 107046-XX Control
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional HVAC installer (or
equivalent), service agency or the gas supplier.
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves
and protective clothing.
508416-01
WARNING
CAUTION

Table of Contents

Technical Specifications - A97US2V............................2
Parts Arrangement.......................................................6
Unit Components .........................................................7
Placement and Installation ........................................29
Joint Cementing Procedure .......................................30
Venting Practices .......................................................31
Vent Piping Guidelines ..............................................35
Condensate Piping ....................................................48
Start-Up .....................................................................53
Heating System Service Checks ...............................54
Proper Ground and Voltage .......................................57
Typical Operating Characteristics ..............................58
Maintenance ..............................................................59
Wiring and Sequence of Operation ...........................62
...................................................................................68
Program Unit Capacity Size Modes...........................72
Operation ...................................................................77
Electric shock hazard.
Can cause injury or death. Before attempting
to perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
*P508416-01*
Issue 2338
WARNING
(P) 508416-01
Page 1 of 77

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  • Page 1: Table Of Contents

    SERVICE MANUAL A97US2V Gas Furnace with 107046-XX Control This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. Table of Contents Technical Specifications - A97US2V......2 Parts Arrangement............6 Unit Components ............7...

  • Page 2: Technical Specifications - A97Us2V

    Inlet (ICS) Breaker F.L.A. (V.A.) Weight Input Output* Input Output* Capacity (in.) Phase or Fuse (lbs.) (Btuh) (Btuh) (Btuh) (Btuh) A97US2V045B12S 29,000 28,000 44,000 43,000 97.0 120-60-1 A97US2V070B12S 43,000 42,000 66,000 64,000 97.0 120-60-1 A97US2V090C12S 57,000 56,000 88,000 85,000 97.0...
  • Page 3 +18% +24% -18% -12% Default +12% +18% +24% 1010 1060 1115 A97US2V045B12S FIRST STAGE COOLING - SCFM SECOND STAGE COOLING - SCFM Motor Size: 1/2 HP Speed Med Low Med High High Med Low Med High High Blwr Size: 10 x 9...
  • Page 4 LOW FIRE HEATING - SCFM HIGH FIRE HEATING - SCFM [TEMP RISE: 35 - 65 F°]* [TEMP RISE: 60 - 90 F°]* Adj. -18% -12% Default +12% +18% +24% -18% -12% Default +12% +18% +24% 1005 1080 1150 1225 1300 1370 1445 1520...
  • Page 5 ACCESSORY LIST Catalog Number Description Comfort Sync Wi-Fi Thermostat 1.841197 Comfort Sync Wi-Fi Thermostat External Filter Rack Kits 1.841018 1 pack (16 x 25) 1.841039 10 pack (16 x 25) Natural to LP Kits 11K48 2-Stage – 90 11K47 High Altitude (> 7500') Return Air Base 68W62 17.5"...

  • Page 6: Parts Arrangement

    Parts Arrangement FLEXIBLE NO-HUB EXHAUST COLLAR TOP CAP HEAT EXCHANGER ASSEMBLY BURNER BOX ASSEMBLY GAS VALVE AND MANIFOLD FLUE COLLAR CABINET COMBUSTION AIR INDUCER PRIMARY LIMIT BLOWER DECK BLOWER ASSEMBLY DOOR PANELS CONTROL BOX (includes integrated ignition control and transformer) Figure 1.

  • Page 7: Unit Components

    Circuit Breaker (CB8) Unit Components A 24V circuit breaker is also located in the control box. The switch provides overcurrent protection to the transformer A97US2V unit components are shown in Figure 1. (T1). The breaker is rated 3A at 32V. If the current exceeds The gas valve, combustion air inducer and burners can this limit the breaker will trip and all unit operation will be accessed by removing the access panel.
  • Page 8 NOTE: During abnormal conditions such as low supply Pin # Function voltage or low outdoor temperatures and the low fire Ignitor pressure switch does not close, the combustion air inducer Combustion Air Inducer High Speed will switch to high fire. After a 15 second pre-purge the Combustion Air Inducer Low Speed high fire pressure switch will close and the unit will begin operation on high fire.
  • Page 9 RS-BUS TERMINAL BLOCK THERMOSTAT CONNECTIONS (TB1) I+ = DATA HIGH CONNECTION DS = DEHUMIDIFICATION SIGNAL I- = DATA LOW CONNECTION W2 = HEAT DEMAND FROM 2ND STAGE TSTAT W1 = HEAT DEMAND FROM 1ST STAGE TSTAT RS-BUS TERMINAL BLOCK R = CLASS 2 VOLTAGE TO TSTAT R = 24VAC G = MANUAL FAN FROM TSTAT I+ = DATA HIGH CONNECTION...
  • Page 10 CLG BLOWER SPEED ADJUSTMENT 2ND STAGE HEAT ON DELAY DEFAULT 7 MIN UPSTAGE THERMOSTAT SELECTION DELAY + 10% TWO STAGE THERMOSTAT 12 MIN UPSTAGE − 10% DELAY 1−STAGE THERMOSTAT (TIMED STAGING) −SEE SW #2 HSI/CAI HEATING BLOWER−OFF DELAY 90 SECOND HTG BLOWER DIAGNOSTIC OFF DELAY...
  • Page 11 Display Action (when button released) No change (idle)* Remain in idle mode Solid “E” Enter diagnostic recall mode Solid “F” Enter flame signal mode Solid “P” (variable speed only) Program unit capacity/size unit (Unit Code) Soft disable Two horizontal bars * No change implies the display will continue to show whatever is currently being displayed for normal operation (blinking decimal, active error code, heat state, etc.) Table 4.
  • Page 12 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover Idle mode (Decimal blinks at 1 Hertz - 0.5 seconds • ON, 0.5 seconds OFF). Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 seconds OFF) / cfm setting for current mode displayed.
  • Page 13 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E124 Active communicating thermostat Equipment lost communication with the thermostat. Check signal missing for more than 3 minutes four wiring connections, ohm wires, and cycle power at the (Communicating systems only). thermostat.
  • Page 14 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E223 Low pressure switch failed open Check pressure(inches W.C) of low pressure switch closing on heat call. Measure operating pressure (inches w.c.). Inspect vent and combustion air inducer for correct operation and restriction. Resumes normal operation after fault is cleared.
  • Page 15 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E274 Soft lockout - Exceeded maximum number of Shut down system 1-hour soft lockout. Check firing rate and recycles. Last recycle failed due to the limit air flow. Check for blockage. Clears when heat call finishes circuit opening or limit remained open longer successfully.
  • Page 16 Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover E347 No 24 Volt output on Y1 of "integrated Operation stopped. Y1 relay/Stage 1 failed. (Pilot relay contacts control" with non-communicating outdoor did not close or the relay coil did not energize; no input back to unit.
  • Page 17 Indoor Blower Operation DIP Switch Settings NOTE: All Comfort Sync settings are set at the Comfort Sync Wi-Fi thermostat. See Comfort Sync installation Switches 5 and 6 -- Cooling Mode Blower Speed -- instruction. In Comfort Sync communication system all The unit is shipped from the factory with the dip switches DIP switch and clippable link settings are ignored.
  • Page 18 Ramping Option A (Factory Selection) Heat Speed Switch 11 Switch 12 Switch 13 • Motor runs at 50% for 30 seconds. +24% • Motor then runs at 82% for approximately 7-1/2 +18% minutes. +12% • If demand has not been satisfied after 7-1/2 minutes, motor runs at 100% until demand is satisfied.
  • Page 19 Operating Sequence System Demand System Response Thermostat Relative Humidity Blower Demand System Step Compressor Comments Condition (COOL) Status Stage NO CALL FOR DEHUMIDIFICATION Compressor and indoor Normal Operation Acceptable 24 VAC High 100% blower follow thermostat demand BASIC MODE (only active on a Y1 thermostat demand) Normal Operation Acceptable 24 VAC...
  • Page 20 Operating Sequence System Demand System Response Thermostat Demand Relative Humidity Blower System Step Compressor Comments Condition (COOL) Status Stage Stage NO CALL FOR DEHUMIDIFICATION Normal Operation Acceptable Compressor and indoor - Y1 blower follow thermostat Normal Operation demand Acceptable High 100% - Y2 ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING...
  • Page 21 IMPORTANT Earlier ECM motors used on other Allied Air furnace models are not interchangeable with motors used on the A97US2V furnace line. A solid-state controller is permanently attached to the motor.
  • Page 22 Motor Start-Up STATOR When B3 begins start-up, the motor gently vibrates back (WINDINGS) and forth for a moment. This is normal. During this time BEARING the electronic controller is determining the exact position of the rotor. Once the motor begins turning, the controller slowly eases the motor up to speed (this is called “soft- ROTOR start”).
  • Page 23 Using test jumpers, apply 24V to pins 3 and 4 on P49 P48 5 Pin on the motor. P49 4 Pin NOTE: Do not apply 24V to pins 2 and 4 on P49. Doing SHAFT so will cause permanent damage to the motor. Motor should run at 75%.
  • Page 24 Troubleshooting Motor Windings TEST B Ensure that motor windings are not damaged by performing Use an ohmmeter to measure the motor phase-to-phase the following tests: resistance by checking these combinations of the the 3-pin motor plug. For the purpose of this test, start at either end NOTE: If your ohm meter is not an auto-ranging type, set of the connector as lead 1.
  • Page 25 Burners LPG change over kits are available from Allied. Kits include burner orifices and a gas valve. All units use inshot burners. Burners are factory set and require no adjustment.
  • Page 26 Combustion Air Inducer and Cold End pressure (pressure becomes more equal with atmospheric pressure) and opens the circuit to the furnace control and Header Box gas valve. A bleed port on the switch allows relatively All A97US2V units use a two-stage combustion air inducer dry air in the vestibule to purge switch tubing, to prevent to move air through the burners and heat exchanger during condensate build up.
  • Page 27 Test 1 Check ignitor circuit for correct resistance. Remove 4-pin plug from control. Check ohms reading across terminals 1 and 5. Reading should be between 39 and 70 ohms. If value is correct, this is the only test needed. If the reading on the meter is not correct, (0 or infinity) then a second test is needed.
  • Page 28 Pressure Switch Check Operate unit and observe manometer reading. Readings will change as heat exchanger warms. To check pressure switch differential, refer to Figure 16 Take one reading immediately after start-up. and use the provided fittings and tubing to follow the steps below.

  • Page 29: Placement And Installation

    Canadian Applications Only - Pipe, fittings, primer and Placement and Installation solvent cement used to vent (exhaust) this appliance must be certified to ULC S636 and supplied by a single All pipe, fittings, primer and solvent cement must conform manufacturer as part of an approved vent (exhaust) with American National Standard Institute and the American system.

  • Page 30: Joint Cementing Procedure

    STANDARD CONCENTRIC Outdoor Outdoor Exhaust Exhaust Flush 1-1/2” 2” 3” Accelerator VENT PIPE Accelerator Mount Concentric Concentric Concentric (Dia. X A97USMV DIA. (Dia. X Length) (in.) Length) 71M80 69M29 60L46 1-1/2” X 12” 2” X 12” 51W11 * or 44W93+ +44W92++ +44W92++ 1-1/2...

  • Page 31: Venting Practices

    Removal of the Furnace from Common Vent Immediately after applying last coat of cement to pipe, and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into WARNING socket until it bottoms out. Turn PVC pipe 1/4 turn during assembly (but not after pipe is fully inserted) to CARBON MONOXIDE POISONING HAZARD distribute cement evenly.
  • Page 32 Exhaust Piping (Figure 19 and Figure 20) Close all building doors and windows and all doors between the space in which the appliances remaining Route piping to outside of structure. Continue with connected to the common venting system are located installation following instructions given in piping termination and other spaces of the building.
  • Page 33 TYPICAL EXHAUST PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT APPLICATIONS (RIGHT-HAND DISCHARGE SHOWN) NOTE: 1-1/2” Vent Pipe Diameter Allowed Only on 045/070 Units 12” max. 2” 1-1/2” 2” 3” TRANSITION TRANSITION 2” 2” 2” 2” *2” *2” 2” EXHAUST EXHAUST EXHAUST 45°...
  • Page 34 TYPICAL INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS 2” 3” Pipe size determined in Table 5 TRANSITION INTAKE *2” 2” 2” 2” 2” * When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible. NOTE: Exhaust pipe and intake pipe must be the same diameter.

  • Page 35: Vent Piping Guidelines

    Vent Piping Guidelines CAUTION NOTE: Allied Air has approved the use of DuraVent ® If this unit is being installed in an application with Centrotherm manufactured vent pipe and terminations as combustion air coming in from a space serviced by an an option to PVC.
  • Page 36 Use the following steps to correctly size vent pipe diameter. Exhaust Pipe 12” Min. 12” Max. Horizontal 045, 070, Gas Furnace Furnace capacity? 090, 110 or 135 btuh NOTE - Standard or ward unit. A minimum of 1/4” (6mm) drop for each 12” (305mm) Which termination? Concentric? of horizontal run is mandatory for drainage.
  • Page 37 Maximum Allowable Intake or Exhaust Vent Length in Feet Standard Termination at Elevation 0 - 4500 ft Number 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3" Pipe of 90° Model Model Model Model Elbows Used Standard Termination Elevation 4500 - 10,000 ft 1-1/2"...
  • Page 38 Maximum Allowable Intake or Exhaust Vent Length in Feet Concentric Termination at Elevation 0 - 4,500 ft Number 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3" Pipe of 90° Model Model Model Model Elbows Used Concentric Termination Elevation 4,501 - 10,000 ft 1-1/2"...
  • Page 39 Maximum Allowable Exhaust Vent Lengths with Furnace Installed in a Closet or Basement Using Ventilated Attic or Crawl Space for Intake Air in Feet Standard Termination at Elevation 0 - 4500 ft Number 1-1/2" Pipe 2" Pipe 2-1/2" Pipe 3" Pipe of 90°...
  • Page 40 General Guidelines for Vent Terminations In Non-Direct Vent applications, combustion air is taken IMPORTANT from indoors or ventilated attic or crawlspace and the flue gases are discharged to the outdoors. The A97US2V is Do not use screens or perforated metal in exhaust then classified as a non-direct vent, Category IV gas terminations.
  • Page 41 Maximum Allowable Exhaust Vent Pipe Length (in ft.) without Insulation in Unconditioned Space for Winter Design Temperatures Winter Design Unit Input Size Temperatures ºF Vent Pipe (ºC) Diameter 1-1/2 in. 32 to 21 2 in. (0 to -6) 2-1/2 in. 3 in.
  • Page 42 VENT TERMINATION CLEARANCES FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA INSIDE CORNER DETAIL Fixed Operable Fixed Closed Closed Operable AREA WHERE TERMINAL AIR SUPPLY INLET VENT TERMINAL IS NOT PERMITTED US Installations Canadian Installations Clearance above grade, veranda, 12 inches (305mm) or 12 inches (305mm) 12 inches (305mm) or 12 inches (305mm) porch, deck or balcony...
  • Page 43 Details of Intake and Exhaust Piping Intake and exhaust pipes should be placed as close together as possible at termination end (refer to Terminations for Direct Vent Installations illustrations). Maximum separation is 3” (76MM) NOTE: In Direct Vent installations, combustion air is taken on roof terminations and 6”...
  • Page 44 On field-supplied terminations, a minimum distance STRAIGHT-CUT OR between the end of the exhaust pipe and the end of ANGLE-CUT IN DIRECTION OF ROOF SLOPE * the intake pipe without a termination elbow is 8” and a minimum distance of 6” with a termination elbow. See 3”...
  • Page 45 VENT TERMINATION CLEARANCES FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA INSIDE CORNER DETAIL Fixed Operable Fixed Closed Closed Operable AREA WHERE TERMINAL AIR SUPPLY INLET VENT TERMINAL IS NOT PERMITTED US Installations Canadian Installations Clearance above grade, veranda, 12 inches (305mm) or 12 inches (305mm) 12 inches (305mm) or 12 inches (305mm) porch, deck or balcony...
  • Page 46 Details of Exhaust Piping Terminations for Non- STRAIGHT-CUT OR * SIZE TERMINATION PIPE PER EXHAUST Direct Vent Applications ANGLE-CUT IN DIRECTION PIPE TERMINATION SIZE REDUCTION TABLE OF ROOF SLOPE * Exhaust pipes may be routed either horizontally through an outside wall or vertically through the roof. In attic or closet installations, vertical termination through the EXHAUST VENT Minimum 12”...
  • Page 47 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT Vent Pipe Vent Pipe LARGER VENT PIPE SIZE TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...

  • Page 48: Condensate Piping

    Determine which side condensate piping will exit the Condensate Piping unit, location of trap, field-provided fittings and length of PVC pipe required to reach available drain. This unit is designed for either right- or left-side exit of For furnaces with a 1/2” drain connection use a 3/8 condensate piping in upflow applications.
  • Page 49 line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available in various lengths;...
  • Page 50 Evaporator drain From Evaporator Coil line required Field Provided Vent 1” min. 2” max. above (Trap at coil is optional) condensate drain. Field-Provided Vent (1” min. to 2” Max.above condensate drain connection) Furnace Condensate Condensate Drain Condensate Drain Connection Optional Overflow Switch Figure 47.
  • Page 51 Optional Condensate Drain Connection Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) 90° Street Elbow 3/4 inch PVC (not furnished) Adapter 3/4 inch slip X 3/4 inch mpt (not furnished) Condensate Drain Connection In Unit 1 (25 mm) Min. Vent 2 (50 mm) Max.
  • Page 52 Optional Condensate Drain Connection Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) 90° Street Elbow 1/2 inch PVC (Not Furnished) Adapter 1/2 inch slip X 1/2 inch mpt (Not Furnished) Condensate Drain Connection In Unit 1 (25 mm) Min. Vent 2 (50 mm) Max.

  • Page 53: Start-Up

    Placing the Furnace into Operation Start-Up A97US2V units are equipped with an ignition system. Do NOT attempt to manually light burners on this furnace. Preliminary and Seasonal Checks Each time the thermostat calls for heat, the burners will Inspect electrical wiring, both field and factory installed automatically light The ignitor does not get hot when there for loose connections.

  • Page 54: Heating System Service Checks

    This furnace is equipped with an ignition device which Heating System Service Checks automatically lights the burners. Do not try to light the burners by hand. CSA Certification Remove the upper access panel. All units are CSA design certified without modifications. Move gas valve switch to OFF.
  • Page 55 Proper Gas Flow (Approximate) When checking piping connections for gas leaks, use preferred means. Kitchen detergents can cause harmful Furnace should operate at least 5 minutes before checking corrosion on various metals used in gas piping. Use of a gas flow. Determine time in seconds for two revolutions of specialty Gas Leak Detector is strongly recommended.
  • Page 56 High Altitude The manifold pressure, gas orifice and pressure switch may require adjustment or replacement to ensure proper operation at higher altitudes. See Table 26 for manifold pressures. See Table 27 for gas conversion and pressure switch kits. Supply Line Manifold Pressure in w.g.

  • Page 57: Proper Ground And Voltage

    Proper Ground and Voltage In addition, measure the AC voltage from Line Hot A poorly grounded furnace can contribute to premature ignitor failure. Use the following procedure to check for to Line Neutral (spade terminals) on the integrated control. See Figure 53. This voltage should be in the ground and voltage to the integrated control.

  • Page 58: Typical Operating Characteristics

    External Static Pressure Typical Operating Characteristics 1. Tap locations shown in Figure 55. Punch a 1/4” diameter hole in supply and return air Blower Operation and Adjustment plenums. Insert manometer hose flush with inside Blower operation is dependent on thermostat control edge of hole or insulation.

  • Page 59: Maintenance

    Filter Size Maintenance Furnace Cabinet Width Side Return Bottom Return 17-1/2” 16 x 25 x 1 (1) 16 x 25 x 1 (1) 21” 20 x 25 x 1 (1) WARNING 24-1/2” 16 x 25 x 1 (2) 24 x 25 x 1 (1) ELECTRICAL SHOCK, FIRE, OR EXPLOSION Table 29.
  • Page 60 Condensate Hose Screens (Figure 56) 10. Disconnect condensate drain line from the cold end header box. Check the condensate hose screens for blockage and clean if necessary. 11. Disconnect condensate drain tubing from flue collar. Remove screws that secures the flue collar into place. Turn off power to the unit.
  • Page 61 Cleaning the Burner Assembly 30. Reinstall the cold end header box. Turn off electrical and gas power supplies to furnace. 31. Reinstall the combustion air inducer. Reconnect the Remove upper and lower furnace access panels. plug to the wire harness. Disconnect the wires from the gas valve.

  • Page 62: Wiring And Sequence Of Operation

    Wiring and Sequence of Operation BLACK DOOR INTERLOCK FLAME WHITE/PIN SENSOR FLAME BLACK CIRC WHITE BLACK 120V YELLOW BLUE BLUE BROWN RO(IN) BRN W / YEL STRIPE BROWN RO(OUT) BLUE BLUE PURPLE PS2(HI) PINK PS1(LO) RANGE YELLOW BROWN AUTO RS BUS LINK Figure 57.
  • Page 63 COMBUSTION AIR BLOWER MOTOR DOOR IGNITOR INTERLOCK CIRC FLAME SENSE WHT/PINK FLAME SENSOR 120V BLUE BLUE MV COM PINK PURPLE S102 HIGH HEAT PRESSURE SWITCH PURPLE S128 LOW HEAT PRESSURE SWITCH BLUE BRW W / YEL RO(OUT) STRIPE GRN/YEL 24VAC RO(IN) HEAT PUMP AUTO...
  • Page 64 a 15 second pre-purge the high fire pressure switch will close and the unit will begin operation on high fire. WARNING After 10 to 20 seconds of high fire operation the unit will switch to low fire. Electric Shock Hazard. After the pre-purge is complete, a 20-second initial Can cause injury or death.
  • Page 65 NOTE: In these applications, two-stage heat will be After the 20-second warm-up period has ended, the gas valve is energized on low fire (first stage) and initiated by the integrated control if heating demand has ignition occurs. At the same time, the control module not been satisfied after the field adjustable period (7 or 12 minutes).
  • Page 66 Communicating Indoor Furnace Communicating Indoor Furnace Non-Communicating Outdoor Air Conditioner Communicating Outdoor Air Conditioner or Heat Pump Communicating Furnace Communicating Optional Furnace Discharge Air Sensor Optional Discharge Air Sensor Optional Outdoor Optional Air Sensor Outdoor Air Sensor Communicating Thermostat Communicating Green Thermostat Green...
  • Page 67 Optional Accessories for use with any Communicating System NOTE: COMMUNICATING THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED 120V CONNECTIONS ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT “HUM” CONTACT IS REQUIRED. CLOSED ANYTIME OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDIFIER HUMIDITY DEMAND (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNCTIONS IS PRESENT...

  • Page 68: Field Wiring Applications With Conventional Thermostat

    Field Wiring Applications with Conventional Thermostat DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE OUTDOOR T'STAT TERM. STRIP UNIT 1 Heat / 1 Cool Use DIP switch 2 to DO NOT CUT ANY ON-BOARD LINKS set sceond-stage...
  • Page 69 DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE OUTDOOR T'STAT TERM. STRIP UNIT 2 Heat / 2 Cool CUT ON-BOARD LINK W915 2 STAGE COMPR *Not required on all units FURNACE OUTDOOR...
  • Page 70 DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE HEAT PUMP TERM. STRIP T'STAT CUT ON-BOARD LINK W951 Dual Fuel Single- HEAT Stage Heat Pump PUMP Thermostat w/dual fuel capabilities Capable of 2-stage...
  • Page 71 DIP Switch Settings and On-Board Links Thermostat Wiring Connections DIP Switch 1 On Board Links Must Be Cut To Select System Options FURNACE HEAT PUMP TERM. STRIP T'STAT Dual Fuel Single- Stage Heat Pump CUT ON-BOARD LINK Thermostat w/dual W951 fuel capabilities HEAT PUMP...

  • Page 72: Program Unit Capacity Size Modes

    7-segment SIZE FURNACE MODEL SIZE FURNACE MODEL CODE CODE LED display until solid “ ” symbol appears. Release button. A97US2V045B12S-01 A97US2V110C20S-01 IMPORTANT: Field replacement A97US2V070B12S-01 A97US2V135D20S-01 controls may need to be manually configured to validate furnace unit size A97US2V090C12S-01 A97DS2V045B12S-01 code.

  • Page 73: Troubleshooting: Heating Sequence Of Operation

    Troubleshooting: Heating Sequence of Operation CALL FOR FIRST-STAGE HEAT CALL FOR 1ST STAGE HEAT (LOW FIRE) INDOOR BLOWER OFF AFTER HEAT FAN OFF DELAY (LOW HEAT SPEED) INDOOR LIMIT BLOWER OFF HIGH ERROR SWITCH INDOOR WATCHGUARD − AFTER HEAT FAN LIMIT SWITCH CODE CLOSED WITHIN 3...
  • Page 74 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR SECOND-STAGE HEAT CALL FOR 2ND STAGE HEAT (HIGH FIRE) SINGLE STAGE 2 STAGE THERMOSTAT THERMOSTAT 2ND STAGE RECOGNITION DELAY ON DELAY (30 SECONDS) EXPIRED? EXPIRED? ONLY FOR 1ST REQUEST FOR 2ND STAGE HEAT INDUCER SWITCHED TO HIGH SPEED HIGH...
  • Page 75 Troubleshooting: Heating Sequence of Operation (Continued) CALL FOR HEAT SATISFIED FIRST-STAGE HEAT SECOND-STAGE HEAT RUN MODE: 1ST OR 2ND STAGE CALL FOR HEAT. ALL INPUTS MONITORED (LIMIT, PRESSURE, CALL FOR HEAT/COOL, FLAME LEVEL) 2ND STAGE HEAT 2ND STAGE CALL FOR HEAT SATISFIED? DE−ENERGIZE 2ND STAGE GAS VALVE...

  • Page 76: Troubleshooting: Cooling Sequence Of Operation

    Troubleshooting: Cooling Sequence of Operation CALL FOR COOLING 1ST STAGE COOLING REQUEST RECEIVED WAIT FOR COMPRESSOR TIMED OFF DELAY TO EXPIRE ENERGIZE 1ST STAGE COOLING CONTACTOR (COMPRESSOR & FAN) INDOOR BLOWER 2 SECOND ON DELAY ENERGIZE INDOOR BLOWER (LOW COOLING MODE) MAINTAIN INDOOR BLOWER (LOW COOLING MODE)

  • Page 77: Troubleshooting: Continuous Fan Sequence Of Operation

    Troubleshooting: Continuous Fan Sequence of Operation CALL FOR FAN CALL FOR FAN INDOOR BLOWER ON CONTINUOUS FAN SPEED CALL FOR FAN MAINTAIN INDOOR BLOWER AT REMOVED? CONTINUOUS FAN REQUEST MAINTAIN INDOOR FOR COOLING GO TO CALL FOR COOLING BLOWER AT RECEIVED? CONTINUOUS FAN MAINTAIN INDOOR...

This manual is also suitable for:

A97us2vA97us2v070b12sA97us2v090c12sA97us2v090c16sA97us2v090c20sA97us2v110c16s ... Show all

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