Allied A95UH1E Service Manual
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Allied A95UH1E Service Manual

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SERVICE MANUAL
A95UH1E / 95G1UHE
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.
WARNING
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.
CAUTION
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.
508093-01

Table of Contents

Technical Specifications - A95UH1E ...........................2
Technical Specifications - 95G1UHE ...........................5
Parts Arrangement.......................................................8
Electrical ......................................................................9
Placement & Installation ............................................23
Joint Cementing Procedure .......................................24
Venting Practices .......................................................25
Vent Piping Guidelines ..............................................26
Condensate Piping ....................................................41
Start-Up .....................................................................46
Heating System Service Checks ...............................47
Typical Operating Characteristics ..............................51
Maintenance ..............................................................52
Wiring Diagram ..........................................................55
(Continued) ................................................................57
Sequence of Operation..............................................59
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.
*P508093-01*
Issue 2033
WARNING
(P) 508093-01
Page 1 of 59

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Summary of Contents for Allied A95UH1E

  • Page 1: Table Of Contents

    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 - A95UH1E ......2 Technical Specifications - 95G1UHE ......5 Parts Arrangement............8 Electrical ..............9...

  • Page 2: Technical Specifications - A95Uh1E

    Technical Specifications - A95UH1E MODEL NUMBER GUIDE A 95 U H 1 E 11 0 C 20 S - 01 A = Flagship Numeric Code 95 = 95% Efficiency S = Stainless Steel Heat Exchanger UH = Upflow/Horizontal 08 = 2 ton add on cooling...
  • Page 3 BLOWER PERFORMANCE DATA Motor Temp. Heating CFM @ .10" - .80" w.c. Blower Blower Model Size Rise Size Speed (hp) (°F) High Med/High A95UH1E030B08S 10 X 8 30 - 60 Med/Low High 1290 1275 1220 1215 1190 Med/High 1190 1150 1120 1090 1060...
  • Page 4 ACCESSORIES System Accessory Kit Number Description 1.841018 1 pack (16 x 25) External Filter Rack 1.841039 10 pack (16 x 25) 11K50 1-Stage - 90 Natural to LP Kit 13X57 1-Stage - 90 Low Input [030K BTUH] 68W62 17.5" B Width Return Air Base 68W63 21.0"...

  • Page 5: Technical Specifications - 95G1Uhe

    Technical Specifications - 95G1UHE MODEL NUMBER GUIDE 9 5 G 1 U H 0 7 0 B E 1 2 - 0 1 95% Efficency Major Revision 12 = 3 Ton add on cooling 16 = 4 Ton add on cooling 1 = 1 Stage 20 = 5 Ton add on cooling UH = Upflow/Horizontal...
  • Page 6 BLOWER PERFORMANCE DATA Motor Temp. Heating CFM @ .10" - .80" w.c. Blower Blower Model Size Rise Size Speed (hp) (°F) High 1290 1275 1220 1215 1190 Med/High 1190 1150 1120 1090 1060 1015 1000 95G1UH045BE12 10 x 8 35 - 65 1080 1045 1015...
  • Page 7 ACCESSORIES System Accessory Kit Number Description 1.841018 1 pack (16 x 25) External Filter Rack 1.841039 10 pack (16 x 25) 11K50 1-Stage - 90 Natural to LP Kit 11K45 High Altitude 1-Stage 13X57 1-Stage - 90 Low Input [030K BTUH] 68W62 17.5"...

  • Page 8: Parts Arrangement

    Parts Arrangement TOP CAP BURNER BOX ASSEMBLY HEAT EXCHANGER ASSEMBLY GAS VALVE FLUE COLLAR COMBUSTION AIR INDUCER CABINET BLOWER ASSEMBLY COMBUSTION AIR PRESSURE PROVE SWITCH CONTROL BOX COLD END HEADER BOX Figure 1. Page 8 of 59 Issue 2033 508093-01...

  • Page 9: Electrical

    Control is not field repairable. If control is A95UH1E / 95G1UHE unit components are shown in inoperable, simply replace entire control. Figure 1. The combustion air inducer, gas valve and Can cause injury or death. Unsafe burners can be accessed by removing the outer access operation will result if repair is attempted.
  • Page 10 1/4” Quick Connect Terminals 120HUM Humidifier 120VAC LINE 120VAC XFMR Transformer 120VAC CIRC Indoor Blower 120VAC Indoor Air Quality Accessory 120VAC NEUTRALS Common 120VAC HUM24 Humidifier 24VAC 3/16” Quick Connect Terminals COOL Cooling Tap 24VAC HEAT Heating Tap 24VAC Continuous Blower 24VAC PARK (no power) Park terminal for unused speed taps Flame Sense...
  • Page 11 Red LED Flash Code Diagnostic Codes / Status of Furnace No power to control or board fault detected Heartbeat Normal Operation - Idle, Continuous Fan, Cool Continuous Rapid Flash Call for Heat / Burner Operation Reverse Line Voltage Polarity Improper Earth Ground Burner failed to light, or lost flame during heat demand Low Flame Signal - check flame sensor Watchguard - burner failed to light, exceeded maximum number of retries or recycles...
  • Page 12 Ignitor (Figure 5) Fan Time Control A95UH1E / 95G1UHE units use a nitride ignitor made from Heating Fan On Time a proprietary ceramic material. To check ignitor, measure The fan on time of 30 seconds is not adjustable.
  • Page 13 Switch S47 in all A95UH1E / 95G1UHE Heat Exchanger (Figure 6) units is factory preset to open at 210 F + 12 F (99 C + A95UH1E / 95G1UHE units use an aluminized steel primary 6.7 C) on a temperature rise.
  • Page 14 Primary Limit Control (Figure 6) MANIFOLD PRESSURE Primary limit (S10) used on A95UH1E / 95G1UHE units ADJUSTMENT SCREW is located in the heating vestibule panel. When excess (under barbed fitting) MANIFOLD heat is sensed in the heat exchanger, the limit will open.
  • Page 15 Flame Signal In Microamps Normal Drop Out 0.5 - 1.4 Flame Sensor Wire Remove sensor from integrated control and connect alligator clip (−) to flame sensor lead. Multi−Meter Intergrated Control Set Dial to DC MicroAmps Flame Sensor Terminal (−) T o Flame Terminal (+) To Control Sensor Terminal...
  • Page 16 Test 1 Check ignitor circuit for correct resistance. Remove 4-pin plug from control. Check ohms reading across terminals 2 and 4. 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 17 On start-up, the switch monitors whether the combustion air inducer is operating. It closes a circuit to the integrated All A95UH1E / 95G1UHE units use a combustion air inducer control when the difference in pressure across the to move air through the burners and heat exchanger during combustion air inducer orifice exceeds a non-adjustable heating operation.
  • Page 18 Black Tubing (positive +) Red and Black Tubing or Red Tubing (negative -) To Cold End Header Box To Cold End Header Box Field Provided Tubing To Pressure Switch “+” High “-” 1 - Remove thermostat demand and allow unit to 4 - Operate unit and observe manometer reading.
  • Page 19 Problem Corrective Action Check that the pressure switch is open without the combustion air inducer Pressure switch stuck closed operating. Replace if defective. Check for restricted vent. Remove all blockage. Pressure switch does not close due to obstruction in vent pipe Check for proper vent sizing.
  • Page 20 Each blower is statically and dynamically balanced as an assembly before installation in the unit. A95UH1E / 95G1UHE units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing.
  • Page 21 Multi−Meter (set to VAC) Multi−Meter (set to VAC) Test 1 Test 3 (if necessary) Turn on power to unit. Check for 120 volts across terminals Check for 120 volts across terminals “CIRC” and “Neutrals” “L” and “N” on input plug P48. If voltage is present continue on the integrated control.
  • Page 22 Testing the Motor (Figure 17) Motor Module Installation If any motor fails the below tests, do not install the new All replacement motor control modules look similar; control module. The motor is defective and it also must be however, each module is designed for a specific motor replaced.

  • Page 23: Placement & Installation

    SPECIFICATION PVC & CPVC Primer F656 IMPORTANT PVC Solvent Cement D2564 A95UH1E / 95G1UHE exhaust and intake connections CPVC Solvent Cement F493 are made of PVC. Use PVC primer and solvent cement ABS Solvent Cement D2235 when using PVC vent pipe. When using ABS vent pipe,...

  • Page 24: Joint Cementing Procedure

    STANDARD CONCENTRIC Outdoor Outdoor Exhaust Exhaust Flush Mount 1-1/2" 2" Concentric 3" Concentric VENT Accelerator Accelerator Concentric Kit Capacity PIPE DIA. (Dia. X Length) (Dia. X Length) (in.) 71M80 69M29 60L46 1-1/2" x12" 2" x12" 51W11** +44W92++ +44W92++ 44W93+ 1-1/2 2-1/2"...

  • Page 25: Venting Practices

    Promptly apply solvent cement to end of pipe and REPLACING FURNACE THAT inside socket surface of fitting. Cement should be CHIMNEY WAS PART OF A COMMON OR GAS applied lightly but uniformly to inside of socket. Take VENT VENT SYSTEM (Check sizing care to keep excess cement out of socket.

  • Page 26: Vent Piping Guidelines

    Duravent and InnoFlue by Centrotherm venting system must also follow the uninsulated and unconditioned space criteria listed in Table 14. The A95UH1E / 95G1UHE can be installed as either a Figure 21. Non-Direct Vent or a Direct Vent gas central furnace.
  • Page 27 Use the following steps to correctly size vent pipe diameter. 030, 045, Furnace capacity? 070, 090, 110, 135 Standard or Which termination? Concentric? See Table 3 Which needs most Intake or elbows? Exhaust? How many? 1-1/2”, 2”, Desired pipe size? 2-1/2”...
  • Page 28 A95UH1E & 95G1UHE Maximum Allowable Intake or Exhaust Vent Length in Feet Standard Termination at Elevation 0 - 4,500 ft 1-1/2” Pipe 2” Pipe 2-1/2" Pipe 3" Pipe Number Capacity Capacity Capacity Capacity of 90° Elbows Used Standard Termination at Elevation 4,501 - 10,000 ft 1-1/2”...
  • Page 29 A95UH1E & 95G1UHE Maximum Allowable Intake or Exhaust Vent Length in Feet Concentric Termination at Elevation 0 - 4,500 ft 1-1/2” Pipe 2” Pipe 2-1/2" Pipe 3" Pipe Number Capacity Capacity Capacity Capacity of 90° Elbows Used Concentric Termination Elevation 4501 - 10,000 ft 1-1/2”...
  • Page 30 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 - 4,500 ft 1-1/2” Pipe 2” Pipe 2-1/2" Pipe 3" Pipe Number Capacity Capacity...
  • Page 31 TYPICAL EXHAUST PIPE CONNECTIONS IN UPFLOW DIRECT OR NON-DIRECT VENT APPLICATIONS Pipe size determined in Table 11 through Table 13 2” 2” 2” 2” 3” 2” TRANSITION EXHAUST *2” 030/045/070 Only 1-1/2” DO NOT transition from smaller to larger pipe in horizontal runs TRANSITION of exhaust pipe.
  • Page 32 Intake Piping TYPICAL AIR INTAKE PIPE CONNECTIONS The A95UH1E / 95G1UHE furnace may be installed in UPFLOW NON-DIRECT VENT APPLICATIONS either direct vent or non-direct vent applications. In non-direct vent applications, when intake air will be drawn Intake into the furnace from the surrounding space, the indoor...
  • Page 33 In Direct Vent applications, combustion air is taken Ventilation Louvers from outdoors and the flue gases are discharged to the Inlet Air outdoors. The A95UH1E / 95G1UHE is then classified as a Roof Terminated (Minimum 12 in. Exhaust Pipe direct vent, Category IV gas furnace.
  • Page 34 Maximum Allowable Exhaust Vent Pipe Length (in ft.) without Insulation in Unconditioned Space For Winter Design Temperatures Single - Stage High Efficiency Furnace Unit Input Size Winter Design Vent Pipe Temperatures ºF (ºC) Diameter 1-1/2 in. 32 to 21 2 in. (0 to -6) 2-1/2 in.
  • Page 35 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Allied Air recommends avoiding this location if possible. Figure 30. Vent Termination Clearances for Direct Installations 508093-01...
  • Page 36 Details of Intake and Exhaust Piping PVC beyond the outside wall. Intake piping should be as short as possible. See Figure 42. Terminations for Direct Vent Installations NOTE: In Direct Vent installations, combustion air is taken 3” (76MM) MIN. from outdoors and flue gases are discharged to outdoors. SIZE PER EXHAUST PIPE Inches (MM) TERMINATION SIZE...
  • Page 37 If intake and exhaust piping must be run up a side 1 1/2” (38mm) accelerator wall to position above snow accumulation or other provided on 71M80 & 44W92 EXHAUST kits for -045 and -070 models obstructions, piping must be supported. At least one VENT bracket must be used within 6”...
  • Page 38 ‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of two sides beneath the floor. Allied Air recommends avoiding this location if possible. Figure 39. Vent Termination Clearances for Non-Direct Installations...
  • Page 39 Details of Exhaust Piping Terminations for Non- STRAIGHT-CUT OR Direct Vent Applications ANGLE-CUT IN DIRECTION 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 roof Minimum 12”...
  • Page 40 FIELD FABRICATED WALL TERMINATION NOTE − FIELD−PROVIDED REDUCER MAY BE 2” (51mm) 3” (76mm) REQUIRED TO ADAPT LARGER VENT PIPE SIZE Vent Pipe Vent Pipe TO TERMINATION A− Minimum clearance above grade or average 12” (305 mm) 12” (305 mm) snow accumulation B−...

  • Page 41: Condensate Piping

    above 5” may result in a flooded heat exchanger if the Condensate Piping combined primary drain line were to become restricted. NOTE: In horizontal applications it is recommended to This unit is designed for either right- or left-side exit of install a secondary drain pan underneath the unit and condensate piping in upflow applications.
  • Page 42 If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Allied in various lengths; 6 ft. (1.8m) - kit no. 26K68 and 24 ft. (7.3m) - kit no. 26K69.
  • Page 43 Figure 49. Evaporator Coil Using a Common Drain Figure 48. Condensate Trap with Optional Overflow Switch IMPORTANT When combining the furnace and evaporator coil drains together, the A/C condensate drain outlet must be vented to relieve pressure in order for the furnace pressure switch to operate properly.
  • Page 44 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 45 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 46: Start-Up

    Remove the access panel. Move gas valve switch to OFF. See Figure 53. The gas valve on the A95UH1E / 95G1UHE is equipped Wait five minutes to clear out any gas. If you then with a gas control switch. Use only your hand to move the smell gas, STOP! Immediately call your gas supplier switch.

  • Page 47: Heating System Service Checks

    All units are C.S.A. design certified without modifications. preferred means. Kitchen detergents can cause harmful corrosion on various metals used in gas piping. Use of a Refer to the A95UH1E / 95G1UHE Operation and specialty Gas Leak Detector is strongly recommended. Installation Instruction.
  • Page 48 Furnace should operate at least 5 minutes before checking Manifold Pressure Measurement gas flow. Determine time in seconds for two revolutions of Follow the steps below and use Figure 55 as a reference. gas through the meter. (Two revolutions assures a more Gas manifold Kit 10L34 provides additional components if accurate time.) Divide by two and compare to time in Table needed.
  • Page 49 Proper Combustion Some units installed at altitude of 4501 - 10,000 feet (1373 to 3048 m) may require a pressure switch change Furnace should operate minimum 15 minutes with correct which can be ordered separately and a manifold de-rate. manifold pressure and gas flow rate before checking See Table 18 or Table 19 for manifold pressures at all combustion.
  • Page 50 Proper Ground and Voltage as a function of load indicates a poor or partial ground. Compare the readings to Table 21. If the readings exceed the maximum shown in Table 21, make repairs CAUTION before operating the furnace. In addition, measure the AC voltage from Line Hot If a flexible gas connector is required or allowed by to Line Neutral (spade terminals) on the integrated the authority that has jurisdiction, black iron pipe shall...

  • Page 51: Typical Operating Characteristics

    OFF position. Seal the hole when the check is complete. Temperature Rise (Figure 57) EXTERNAL STATIC PRESSURE Temperature rise for A95UH1E / 95G1UHE units depends Supply Duct Static on unit input, blower speed, blower horsepower and static Return Duct Static + pressure as marked on the unit rating plate.

  • Page 52: Maintenance

    Filter Size Maintenance 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, Table 22.
  • Page 53 Winterizing and Condensate Trap Care 10. Disconnect condensate drain line from the cold end header box. 1. Turn off power to the furnace. 11. Disconnect condensate drain tubing from flue collar. Have a shallow pan ready to empty condensate water. Remove screws that secures the flue collar into place.
  • Page 54 Cleaning the Burner Assembly (if needed) 30. Reinstall the cold end header box. 1. 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 55: Wiring Diagram

    Wiring Diagram 508093-01 Issue 2033 Page 55 of 59...

  • Page 56: Troubleshooting: Heating Sequence Of Operation

    Troubleshooting: Heating Sequence of Operation HEATING SEQUENCE OF OPERATION ABNORMAL HEATING MODE NORMAL HEATING MODE POWER ON GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER DELAY OFF. CONTROL SELF-CHECK OKAY? LED SLOW FLASH (RESET CONTROL BY TURNING MAIN POWER OFF.) LED FLASHES CODE 1 - POLARITY IS POLARITY CORRECT? REVERSED.

  • Page 57: Troubleshooting: Heating Sequence Of Operation (Continued)

    Troubleshooting: Heating Sequence of Operation (Continued) HEATING SEQUENCE CONTINUED 15 SECOND COMBUSTION AIR INDUCER PREPURGE INITIATED BY CLOSED PRESSURE SWITCH. LED FLASHES CODE 13 - LOW LINE VOLTAGE. ONCE VOLTAGE IS ABOVE IS VOLTAGE ABOVE 70 VOLTS? IGNITOR WARM UP -- 20 SECONDS. 75 VOLTS, HEATING SEQUENCE RESTARTS.

  • Page 58: Troubleshooting: Cooling Sequence Of Operation

    Troubleshooting: Cooling Sequence of Operation COOLING SEQUENCE OF OPERATION POWER ON IGNITION CONTROL MAIN POWER ON. LED FLASHES STEADY - CIRCUIT BOARD FAILURE CONTROL SELF DIAGNOSTIC CHECK. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. IS CONTROL OPERATING NORMALLY? INDOOR BLOWER OFF WITH NORMAL DELAY. INTERRUPT MAIN POWER TO RESET CONTROL.

  • Page 59: Troubleshooting: Continuous Fan / Accessories Sequence Of Operation

    Troubleshooting: Continuous Fan / Accessories Sequence of Operation CONTINUOUS FAN / ACCESSORIES SEQUENCE OF OPERATION LED: SLOW FLASH RATE REMAINS UNCHANGED THROUGHOUT SEQUENCE. MANUAL FAN SELECTION MADE AT THERMOSTAT. CONTROL (G) ENERGIZES SYSTEM FAN AT FAN SPEED. EAC TERMINAL IS ENERGIZED. THERMOSTAT CALLS FOR HEAT (W).

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