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Carrier 58MXB Series, Installation, Start-Up, And Operating Instructions Manual, Page: 60 / 60

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Carrier 58MXB Series Installation, Start-Up, And Operating Instructions Manual Download Page 60

Copyright 2005 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231

58mxb1si

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1

4

Tab

6a 8a

PC 101

Printed in U.S.A.

Catalog No. 58MXB-1SI

Pg 60

8-05

Replaces: 58MXA-18SI

Summary of Contents for 58MXB Series

Page 1: ...ons 19 Air Ducts 21 General Requirements 21 Ductwork Acoustical Treatment 21 Supply Air Connections 21 Return Air Connections 21 Filter Arrangement 22 Bottom Closure Panel 23 Gas Piping 23 Electrical Connections 24 115 v Wiring 25 24 v Wiring 26 Accessories 26 Removal of Existing Furnaces from Common Vent Systems 27 Combustion Air and Vent Pipe Systems 27 Condensate Drain 41 General 41 Application...

Page 2: ...nal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation The 58MXB Multipoise Condensing Gas Fired Furnaces are CSA formerly AGA and CGA design certified for natural and propane gases see furnace rating plate and ...

Page 3: ...OTTOM INLET 18 1 4 22 11 16 CONDENSATE DRAIN TRAP LOCATION DOWNFLOW HORIZONTAL RIGHT OR ALTERNATE 1 2 IN DIA GAS CONN 2 IN COMBUSTION AIR CONN 1 2 IN DIA GAS CONN 7 8 IN DIA POWER CONN 1 2 IN DIA THERMOSTAT ENTRY 2 IN VENT CONN DIMPLE LOCATORS FOR HORIZONTAL HANGING 14 1 2 TYP SIDE INLET NOTES 1 Minimum return air openings at furnace based on metal duct If flex duct is used see flex duct manufactu...

Page 4: ... to remove drywall dust and construction debris from all HVAC system components after construction is completed After construction is complete verify furnace operating condi tions including ignition input rate temperature rise and vent ing according to the manufacturer s instructions The furnace shall be installed so that the electrical components are protected by water These furnaces are shipped ...

Page 5: ... This furnace is approved for UPFLOW DOWNFLOW and HORIZONTAL installations Cette fournaise est approuvée pour l installation HORIZONTALE et la circulation d air VERS LE HAUT et VERS LE BAS BOTTOM DESSOUS 0 Ø 3 0 0 TOP PLENUM DESSUS CHAMBRE D AIR 1 0 24 MIN ALL POSITIONS DOWNFLOW POSITIONS I HORIZONTAL POSITIONS S I DE C O T E S F R O N T A V A N T B C K A R R I E A E R S E R VI E C LÈNTR T E N E I...

Page 6: ... condensing furnace is available in model sizes ranging from input capacities of 40 000 to 138 000 Btuh as direct vent 2 pipe application and in model sizes ranging from input capacity of 40 000 to 120 000 Btuh as non direct vent 1 pipe application APPLICATIONS Step 1 General Some assembly and modifications are required for furnaces installed in any of the 4 applications shown in Fig 1 All drain a...

Page 7: ...Casing hole filler cap must be installed in blower shelf hole when condensate trap is relocated to prevent combustion products being drawn in from appliances in the equipment room 4 Install condensate trap into left hand side casing hole by inserting tube connection stubs through casing hole and rotating until tabs snap into locking position 5 Fill unused condensate trap casing holes with plastic ...

Page 8: ... Upper Inducer Housing Drain Connection Attached to the UPPER unused inducer housing drain connection is a cap and clamp This cap is used to prevent condensate leakage in this application Ensure this connection is capped NOTE See Fig 6 or 7 or tube routing label on main furnace door to check for proper connections CONDENSATE TRAP FREEZE PROTECTION Refer to Condensate Drain Protection section for r...

Page 9: ...llector box drain tube blue and white striped label to condensate trap Tube does not need to be cut b Clamp tube to prevent any condensate leakage 2 Condensate Trap Located on Right Side of Casing a Install drain tube coupling factory supplied in loose parts bag into collector box drain tube blue and white striped label which was previ ously plugged b Connect larger diameter drain tube factory sup...

Page 10: ...in Protection section for recommenda tions and procedures Step 4 Horizontal Left Supply Air Discharge Applications A horizontal left furnace application is where furnace blower is located to the right of combustion and controls section of furnace and conditioned air is discharged to the left CONDENSATE TRAP LOCATION The condensate trap must be removed from the factory installed blower shelf locati...

Page 11: ...enda tions and procedures CONSTRUCT A WORKING PLATFORM Construct working platform where all required furnace clearances are met See Fig 3 and 11 or 12 UNIT MAY NOT OPERATE Failure to follow this caution may result in intermittent unit operation The condensate trap MUST be installed below furnace See Fig 5 for dimensions The drain connection to condensate trap must also be properly sloped to an ope...

Page 12: ... CONDENSING FURNACE IS INSTALLED ABOVE FINISHED CEILINGS Fig 12 Attic Location and Working Platform for Non Direct Vent 1 pipe Applications Sizes 040 Through 120 Only A96184 VENT MANUAL SHUTOFF GAS VALVE SEDIMENT TRAP CONDENSATE TRAP DRAIN ACCESS OPENING FOR TRAP 30 IN MIN WORK AREA A 12 IN MIN HORIZONTAL PIPE SECTION IS RECOMMENDED WITH SHORT 5 TO 8 FT VENT SYSTEMS TO REDUCE EXCESSIVE CONDENSATE ...

Page 13: ... shelf hole when condensate trap is relocated to prevent combustion products being drawn in from appliances in the equipment room 4 Install condensate trap into left hand side casing hole by inserting tube connection stubs through casing hole and rotating until tabs snap into locking position 5 Fill unused condensate trap casing holes with plastic filler caps factory supplied in loose parts bag CO...

Page 14: ...and procedures CONSTRUCT A WORKING PLATFORM Construct working platform where all required furnace clearances are met See Fig 3 and 11 or 12 UNIT MAY NOT OPERATE Failure to follow this caution may result in intermittent unit operation The condensate trap MUST be installed below furnace See Fig 5 for dimensions The drain connection to condensate trap must also be properly sloped to an open drain NOT...

Page 15: ...e ductwork and filters are cleaned as necessary to remove drywall dust and construction debris from all HVAC system components after construction is completed After construction is complete verify furnace operating conditions including ignition input rate temperature rise and venting according to the manufacturer s instructions UNIT DAMAGE HAZARD Failure to follow this caution may result in minor ...

Page 16: ...al must be made between the furnace cabinet and the return air duct to prevent pulling air from the burner area and from draft safeguard opening CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in peronal injury or death The operation of exhaust fans kitchen ventilation fans clothes dryers attic exhaust fans or fireplaces could create a NEGATIVE PRESSURE CONDITION at th...

Page 17: ...the space Table 2 Minimum Space Volumes were determined by using the following equations from the National Fuel Gas Code ANSI Z223 1 2002 NFPA 54 2002 8 3 2 2 1 For other than fan assisted appliances such as a draft hood equipped water heater 2 For fan assisted appliances such as this furnace Table 1 Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors FURNACE INPUT BTUH ...

Page 18: ...ngs exposed to the outdoors have a continu ous sealed vapor barrier Openings are gasketed or sealed and b Doors and openable windows are weatherstripped and c Other openings are caulked or sealed These include joints around window and door frames between sole plates and floors between wall ceiling joints between wall panels at penetrations for plumbing electrical and gas lines etc NOTE In determin...

Page 19: ... dimensions specified in Table 3 and Fig 21 3 Construct plenum to dimensions specified in Table 3 and Fig 21 4 If downflow subbase KGASB is used install as shown in Fig 22 If Coil Assembly Part No CD5 or CK5 or Coil Box Part No KCAKC is used install as shown in Fig 20 NOTE Remove furnace perforated discharge duct flanges when they interfere with mating flanges on coil on downflow subbase To remove...

Page 20: ...plications on Combustible Flooring NOT Using KGASB Subbase Furnace with CD5 or CK5 Coil Assembly or KCAKC Coil Box 19 19 20 20 24 1 2 Upflow Applications 23 24 1 8 23 5 8 24 3 4 Downflow Applications on Non Combustible Flooring 22 7 8 19 23 1 2 19 5 8 Downflow Applications on Combustible Flooring Using KGASB Subbase Furnace with or without CD5 or CK5 Coil Assembly or KCAKC Coil Box 22 1 8 19 23 3 ...

Page 21: ... air conditioning coil casing when used DO NOT cut main furnace casing to attach supply side air duct humidifier or other accessories All accessories MUST be connected external to furnace main casing Downflow Furnaces Connect supply air duct to supply air opening on furnace The supply air duct attachment must be connected to ONLY furnace supply outlet or air conditioning coil casing when used when...

Page 22: ...Through 120 Only A05054 NOTES ANGLE IRON OR EQUIVALENT B A ROD LOCATION USING DIMPLE LOCATORS SEE DIMENSIONAL DWG FOR LOCATIONS 13 16 IN MAX ALTERNATE SUPPORT LOCATION FROM BACK ALTERNATE SUPPORT LOCATION 4 IN MIN 8 IN MAX 3 8 IN ROD A B A B B A 1 A 1 In clearance minimum between top of furnace and combustible material 2 The entire length of furnace must be supported when furnace is used in horizo...

Page 23: ...re panel perform following 1 Tilt or raise furnace and remove 2 screws holding front filler panel See Fig 28 2 Rotate front filler panel downward to release holding tabs 3 Remove bottom closure panel 4 Reinstall front filler panel and screws Step 7 Gas Piping Gas piping must be installed in accordance with national and local codes Refer to current edition of NFGC in the United States Canadian inst...

Page 24: ...ediately upstream of gas supply connection to furnace and downstream of manual shutoff valve Gas line grommet factory supplied loose parts bag should be used when installing gas piping Gas line entry hole filler plug should be installed in unused gas line entry hole See Fig 30 NOTE The gas valve inlet pressure tap connection is suitable to use as test gauge connection providing test pressure DOES ...

Page 25: ...ust be located within sight from and readily accessible to furnace NOTE Proper polarity and proper grounding must be maintained for 115 v wiring If polarity is incorrect control LED status indicator will flash rapidly and furnace will NOT operate Fig 30 Typical Gas Pipe Arrangement A05057 COMBUSTION AIR PIPE GROMMETS GAS LINE GROMMET GAS LINE COMBUSTION AIR PIPE VENT PIPE VENT PIPE GROMMET UNUSED ...

Page 26: ...ontains a 3 amp automotive type fuse located on furnace control See Fig 36 Any electrical shorts of 24 v wiring during installation service or maintenance may cause fuse to blow If fuse replace ment is required use only a fuse of identical size 3 amp and type The control will flash code 24 when fuse needs replacement NOTE Use AWG No 18 color coded copper thermostat wire for lengths up to 100 ft Fo...

Page 27: ...ny other appliances when resizing vent systems or vent connectors system or connector must be sized to approach minimum size as determined using appropriate table found in the NFGC or NSC NGPIC The 58MXB can be vented as either a direct vent all sizes or as a non direct vent except for 140 size application A direct vent system shall be installed in accordance with the direct vent 2 pipe procedures...

Page 28: ...M 24VAC HUMIDIFIER CONNECTION 0 5 AMP MAX IDM INDUCED DRAFT MOTOR PSC IDR INDUCED DRAFT MOTOR RELAY SPST N O ILK BLOWER ACCESS PANEL INTERLOCK SWITCH SPST N O J1 BLOWER OFF DELAY JUMPER SELECTOR JB JUNCTION BOX LED LIGHT EMITTING DIODE FOR STATUS CODES AMBER LGPS LOW GAS PRESSURE SWITCH SPST N O LS LIMIT SWITCH AUTO RESET SPST N C OL AUTO RESET INTERNAL MOTOR OVERLOAD TEMPERATURE SWITCH N C PCB PR...

Page 29: ...ust conform to American National Standards Institute ANSI stan dards and American Society for Testing and Materials ASTM standards See Table 7 for approved materials for use in the U S A FIRE AND EXPLOSION HAZARD Failure to follow this warning could result in fire property damage personal injury or death Solvent cements are combustible Keep away from heat sparks and open flame Use only in well ven...

Page 30: ...ht portion of combustion air inlet pipe from Fig 38 3 Cut field supplied 2 in diameter PVC pipe to length as determined per Fig 38 4 Permanently attach elbow perforated disk assembly to straight portion of pipe using RTV or by cementing as shown in Fig 38 Assembly of Combustion Air Pipe Direct Vent 2 Pipe System ONLY 1 Using Table 11 determine the smallest combustion air diam eter permitted Pick t...

Page 31: ...Table 8 Direct Vent Termination Clearance A05009 31 ...

Page 32: ... Table 9 Other than Direct Vent Termination Clearance A05013 32 ...

Page 33: ...g as a guide Install a field supplied No 6 or No 8 sheet metal screw NOTE DO NOT OVERTIGHTEN SCREW Breakage of intake housing or fitting may cause air leakage to occur A plugged drain connection has been provided on this fitting for use when moisture is found in combustion air intake pipe and combustion box If use of this drain connection is desired drill out fitting s tap plug with 3 16 in drill ...

Page 34: ...nst inducer housing Clamp must be tightened to prevent any condensate leakage 4 Install pipe grommet factory supplied in loose parts bag into selected furnace casing vent pipe hole 5 Be certain that mating surfaces of inducer housing connection elastomeric rubber coupling and 2 in diameter vent pipe are clean and dry Assemble the elastomeric rubber vent cou pling with 2 loose clamps onto inducer h...

Page 35: ... 70 70 70 70 70 60 000 2 Pipe or 2 in Concentric 1 1 2 1 1 2 17 12 7 NA NA NA 2 2 70 67 66 61 61 61 80 000 2 Pipe or 2 in Concentric 2 2 49 44 30 25 25 15 2 1 2 2 1 2 70 70 70 70 70 70 100 000 2 Pipe or 3 in Concentric 2 1 2 2 1 2 35 26 16 16 6 NA 3 3 70 70 70 70 66 61 120 000 2 Pipe or 3 in Concentric 3 NA 14 9 NA NA NA NA NA 3 63 62 62 61 61 61 3 no disk NA 70 70 63 56 50 43 4 no disk 4 no disk ...

Page 36: ...0 70 70 70 70 70 60 000 2 Pipe or 2 in Concentric 1 1 2 1 1 2 14 9 NA NA NA NA 2 2 60 55 54 49 48 47 80 000 2 Pipe or 2 in Concentric 2 2 41 36 23 18 17 8 2 1 2 2 1 2 70 70 70 70 70 70 100 000 2 Pipe or 3 in Concentric 2 1 2 2 1 2 29 21 12 11 NA NA 3 3 70 67 62 57 52 47 120 000 2 Pipe or 3 in Concentric 3 no disk NA 42 35 29 22 15 9 NA 3 53 52 50 49 48 47 4 no disk 4 no disk 70 70 70 70 70 70 140 ...

Page 37: ...UMBER OF 90 ELBOWS TERMINATION TYPE PIPE DIA IN PIPE DIA IN 1 2 3 4 5 6 9001 to 10 000 40 000 2 Pipe or 2 in Concentric 1 1 2 1 1 2 42 37 32 27 25 20 2 2 57 55 53 51 49 47 60 000 2 Pipe or 2 in Concentric 2 2 45 40 38 33 31 29 80 000 2 Pipe or 2 in Concentric 2 2 30 25 14 9 7 NA 2 1 2 2 1 2 57 55 53 51 49 47 100 000 2 Pipe or 3 in Concentric 2 1 2 2 1 2 21 13 5 NA NA NA 3 3 54 49 44 39 34 29 120 0...

Page 38: ... PIPE COMBUSTION AIR PIPE NON DIRECT VENT 1 PIPE COMBUSTION AIR PIPE DIRECT VENT 2 PIPE COMBUSTION AIR PIPE NON DIRECT VENT 1 PIPE COMBUSTION AIR PIPE DIRECT VENT 2 PIPE COMBUSTION AIR PIPE NON DIRECT VENT 1 PIPE COMBUSTION AIR PIPE DIRECT VENT 2 PIPE Fig 39 Combustion Air and Vent Pipe Diameter Transition Location and Elbow Configuration A93034 FURNACE PIPE DIAMETER TRANSITION IN VERTICAL SECTION...

Page 39: ...bottom of combustion air and bottom of vent Maintain 12 in min clearance above highest anticipated snow level or grade whichever is greater A At least 36 in A Maintain 12 in min clearance above highest anticipated snow level Maximum of 24 in above roof 90 Note A denotes 0 to 2 in Fig 43 Vent Pipe Termination for Non Direct Vent 1 pipe System Sizes 040 Through 120 Only A05091 Abandoned masonry used...

Page 40: ... An 080 12 size furnace located in Indianapolis elevation 650 ft above sea level could be installed as either a direct vent 2 pipe system that requires 3 elbows and 32 ft of vent pipe along with 5 elbows and 34 ft of combustion air pipe OR a non direct vent 1 pipe system that requires 3 elbows and 32 ft vent pipe For a direct vent 2 pipe system Table 11 indicates this application would allow a 2 i...

Page 41: ... in section Vent Termination General in this instruction 1 Cut 2 holes 1 for each pipe of appropriate size for pipe size being used 2 Loosely install elbow in bracket and place assembly on combustion air pipe Roof terminations Loosely install pipe coupling on prop erly cut vent pipe Coupling must be positioned so bracket will mount as shown in Fig 42 For applications using combustion air pipe opti...

Page 42: ... tape in half and wrap on itself 3 times 2 Locate heat tape between sides of condensate trap back See Fig 45 3 Use wire ties to secure heat tape in place Wire ties can be positioned in notches of condensate trap sides See Fig 45 4 Wrap field drain pipe with remaining heat tape approximately 1 wrap per ft 5 When using field supplied heat tape follow heat tape manu facturer s instructions for all ot...

Page 43: ...s leaks with an open flame Use a commercially available soap solution made specifically for the detection of leaks to check all connections Step 4 Sequence of Operation FURNACE MAY NOT OPERATE Failure to follow this caution may result in furnace operation stopping and water pipes freezing during cold weather Furnace control must be grounded for proper operation or control will lock out Control is ...

Page 44: ...he thermostat calls for cooling a Single Speed Cooling See Fig 27 50 52 and 54 for thermostat connections The thermostat closes the R to G and Y circuits The R to Y circuit starts the outdoor unit and the R to G and Y Y2 circuits start the furnace blower motor BLWM on COOL speed The electronic air cleaner terminal EAC 1 is energized with 115 vac when the blower motor BLWM is operating When the the...

Page 45: ... Single Speed Air Conditioner Fig 49 Single Stage Furnace with Two Speed Air Conditioner A00269 A00270 Fig 50 Single Stage Furnace with Single Speed Heat Pump Dual Fuel A00271 Fig 51 Single Stage Furnace with Two Speed Heat Pump Dual Fuel 45 ...

Page 46: ...Single Stage Furnace and Single Speed Heat Pump HUMIDFIER 24VAC A02103 Fig 53 Dual Fuel Thermostat with Single Stage Furnace and Two Speed Heat Pump HUMIDFIER 24VAC A02161 Fig 54 Two Stage Thermostat with Single Stage Furnace and Two Speed Air Conditioner 46 ...

Page 47: ...d of the prepurge period then shut off for 24 seconds then come back on at HEAT speed When the W input signal disappears the furnace control begins a normal inducer post purge period and the blower remains running at HEAT speed for the selected blower OFF delay period then switches to low cool speed same speed as FAN If the R to W and Y1 and G signals disappear at the same time the blower motor BL...

Page 48: ... No Manifold Pressure U S A and Canada U S A 775 43 3 8 42 3 2 42 3 3 42 3 4 42 3 5 Altitudes 800 43 3 5 43 3 7 43 3 8 42 3 2 42 3 3 2001 to 825 44 3 8 43 3 4 43 3 6 43 3 7 43 3 8 3000 850 44 3 6 44 3 7 44 3 8 43 3 5 43 3 6 or 875 44 3 4 44 3 5 44 3 6 44 3 7 43 3 4 Canada 900 44 3 2 44 3 3 44 3 4 44 3 5 44 3 6 Altitudes 925 45 3 7 45 3 8 44 3 2 44 3 3 44 3 4 2001 to 950 45 3 5 45 3 6 45 3 7 45 3 8...

Page 49: ...5 3 6 45 3 7 44 3 2 44 3 3 44 3 4 to 850 45 3 4 45 3 5 45 3 6 45 3 8 44 3 2 875 45 3 2 45 3 3 45 3 4 45 3 6 45 3 7 6000 900 45 3 0 45 3 1 45 3 3 45 3 4 45 3 5 925 45 2 9 45 3 0 45 3 1 45 3 2 45 3 3 950 45 2 7 45 2 8 45 2 9 45 3 0 45 3 1 11 975 45 2 6 45 2 7 45 2 8 45 2 9 45 2 9 derate 1000 45 2 5 45 2 5 45 2 6 45 2 7 45 2 8 ALTITUDE RANGE Ft Avg GAS HEAT VALUE AT ALTITUDE Btu cu ft SPECIFIC GRAVIT...

Page 50: ...o Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure Orifice No Manifold Pressure U S A Only 600 43 3 8 42 3 3 42 3 4 42 3 5 42 3 6 625 43 3 5 43 3 6 43 3 8 42 3 2 42 3 3 8001 650 44 3 7 43 3 4 43 3 5 43 3 6 43 3 7 675 44 3 5 44 3 6 44 3 7 44 3 8 43 3 4 to 700 44 3 2 44 3 3 44 3 4 44 3 6 44 3 7 725 45 3 6 45 3 8 44 3 2 44 3 3 44 3 4 9000 750 45 3 4 45 3 5 45 3 6 45 3 8 44 ...

Page 51: ...ing plate adjusted for altitude 1 Determine natural gas orifice size and manifold pressure for correct input a Obtain average gas heat value at installed altitude from local gas supplier b Obtain average gas specific gravity from local gas supplier c Verify furnace model and size Table 13 can only be used for model 58MXB furnaces with rating plate heating inputs 1000 s Btuh of 040 through 120 Tabl...

Page 52: ...fold Pressure U S A and Canada U S A 775 41 3 7 41 3 8 40 3 6 40 3 7 39 3 6 Altitudes 800 42 3 8 41 3 6 41 3 7 41 3 8 40 3 6 2001 to 825 42 3 6 42 3 7 41 3 5 41 3 6 41 3 7 3000 or 850 42 3 4 42 3 5 42 3 6 42 3 7 41 3 5 Canada 875 42 3 2 42 3 3 42 3 4 42 3 5 42 3 6 Altitudes 900 43 3 7 43 3 8 42 3 2 42 3 3 42 3 4 2001 to 925 43 3 5 43 3 6 43 3 7 42 3 2 42 3 3 4500 950 43 3 3 43 3 4 43 3 5 43 3 7 43...

Page 53: ...ure U S A Only 700 41 3 5 41 3 7 41 3 8 40 3 6 40 3 7 725 42 3 7 42 3 8 41 3 5 41 3 6 41 3 8 750 42 3 4 42 3 5 42 3 7 42 3 8 41 3 5 775 42 3 2 42 3 3 42 3 4 42 3 5 42 3 7 5001 800 43 3 7 43 3 8 42 3 2 42 3 3 42 3 4 825 43 3 5 43 3 6 43 3 7 43 3 8 42 3 2 to 850 43 3 3 43 3 4 43 3 5 43 3 6 43 3 7 875 43 3 1 43 3 2 43 3 3 43 3 4 43 3 5 6000 900 43 2 9 43 3 0 43 3 1 43 3 2 43 3 3 925 43 2 7 43 2 8 43 ...

Page 54: ...ve sea level See Table 15 for derate multiplier factor CANADA At installation altitudes between 2001 to 4500 ft this furnace must be derated 5 percent by an authorized Gas Conversion Station or Dealer To determine correct input rate for altitude see example above and use 0 95 as derate multiplier factor b Reinstall burner box cover c Gas valve regulator seal cap MUST be on d Turn off all other gas...

Page 55: ...s used for the desired blower off delay Factory blower off delay setting is 120 sec SET THERMOSTAT HEAT ANTICIPATOR When using a nonelectronic thermostat the thermostat heat anticipator must be set to match the amp draw of the electrical components in R W circuit Accurate amp draw readings can be obtained at thermostat subbase terminals R and W Fig 58 illustrates the easy method of obtaining actua...

Page 56: ... 2 Remove outer furnace door and disconnect inducer motor from wire harness 3 Turn on 115 v power to furnace 4 Set thermostat to call for heat and wait 1 minute When pressure switch is functioning properly hot surface igniter should NOT glow and control status code LED flashes a Status Code 31 If hot surface igniter glows when inducer motor is disconnected shut furnace down immediately De termine ...

Page 57: ...________ Pipe Sloped To Furnace Pipe Insulation ________ Over Ceilings ________ Low Ambient Exposed Pipes Condensate Drain ________ Unit Level or Pitched Forward ________ Internal Tubing Connections Free of Kinks and Traps ________ External Drain Connection Leak Tight and Sloped ________ Condensate Trap Primed before Start Up ________ Heat Tape Installed if Required CHECKLIST START UP ________ Gas...

Page 58: ... ________ Low Ambient Exposed Pipes Condensate Drain ________ Unit Level or Pitched Forward ________ Internal Tubing Connections Free of Kinks and Traps ________ External Drain Connection Leak Tight and Sloped ________ Condensate Trap Primed before Start Up ________ Heat Tape Installed if Required CHECKLIST START UP ________ Gas Input Rate Set Within 2 percent of Rating Plate ________ Temperature ...

Page 59: ...59 ...

Page 60: ...s IN 46231 58mxb1si Manufacturer reserves the right to discontinue or change at any time specifications or designs without notice and without incurring obligations Book 1 4 Tab 6a 8a PC 101 Printed in U S A Catalog No 58MXB 1SI Pg 60 8 05 Replaces 58MXA 18SI ...

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