Service and Maintenance Procedures
Transcript of Service and Maintenance Procedures
1
Infinity ICS --- Model 58MVC, Direct Vent 4---Way MultipoiseCondensing Gas Furnace With IdealComfortt IdealHumidityt
Service and Maintenance ProceduresNOTE: Read the entire instruction manual before starting theinstallation.
ELECTRICAL SHOCK, FIRE OR EXPLOSIONHAZARD
Failure to follow warnings could result in personal injury,death, or property damage.
Improper servicing could result in dangerous operation,serious injury, death, or property damage.
--Before servicing, disconnect all electrical power tofurnace.
--When servicing controls, label all wires prior todisconnecting. Reconnect wires correctly.
--Verify proper operation after servicing.
! WARNING
ELECTRICAL SHOCK, FIRE OR EXPLOSIONHAZARD
Failure to follow this warning could result in propertydamage, personal injury, or death.
The ability to properly perform maintenance on thisequipment requires certain expertise, mechanical skills,tools, and equipment. If you do not possess these, do notattempt to perform any maintenance on this equipmentother than those procedures recommended in the User’sManual.
! WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personalinjury, death, or property damage.
Never store anything on, near, or in contact with thefurnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops, vacuumcleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaningcompounds, plastic or plastic containers, gasoline, kerosene,cigarette lighter fluid, dry cleaning fluids, or other volatilefluids.
3. Paint thinners and other painting compounds, paper bags,or other paper products.
! WARNING
amaCERTIFIED
As an ENERGY STAR® Partner,Carrier Corporation has determinedthat this product meets the ENERGYSTAR® guidelines for energy effi-ciency.
REGISTERED
ISO 9001:2000
SAFETY CONSIDERATIONSRecognize safety information. This is the safety--alert symbol
. When you see this symbol on the unit and in instructions ormanuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING,CAUTION, and NOTE. These words are used with thesafety--alert symbol. DANGER identifies the most serioushazards which will result in severe personal injury or death.WARNING signifies hazards which could result in personalinjury or death. CAUTION is used to identify unsafe practiceswhich may result in minor personal injury or product andproperty damage. NOTE is used to highlight suggestions whichwill result in enhanced installation, reliability, or operation.
Untrained personnel can perform basic maintenance functionsdescribed in User’s Information Manual such as cleaning andreplacing air filters. All other operations must be performed bytrained service personnel. When working on heating equipment,observe precautions in the literature, on tags, and on labelsattached to or shipped with the unit and other safety precautionsthat may apply.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Be careful of sharp metal edges, etc. Use care and wearprotective clothing, gloves, and safety glasses whenremoving parts.
CAUTION!
Installing and servicing heating equipment can be hazardous dueto gas and electrical components. Only trained and qualifiedservice agency personnel should install, repair, or service heatingequipment.
Follow all safety codes including the National Fuel Gas Code(NFGC) NFPA 54--2006/ANSI Z223.1--2006 in the USA, CSAB149.1--05 National Standard of Canada, Natural Gas andPropane Installation Codes (NSCNGPIC) in Canada, and theInstallation Standards, Warm Air Heating and Air ConditioningSystems (NFPA 90B) ANSI/NFPA 90B. Wear safety glasses andwork gloves. Have a fire extinguisher available during start--upand adjustment procedures and service calls.
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A05085
Fig. 1 -- Multipoise Furnace in Upflow Orientation
GENERALThis furnace can be installed as a direct vent (2--pipe) or anoptional ventilated combustion air condensing gas furnace. Theseinstructions are written as if the furnace is installed in an upflowapplication. An upflow furnace application is where the blower islocated below the combustion and controls section of the furnace,and conditioned air is discharged upward. Since this furnace canbe installed in any of the 4 positions shown in Fig. 2, you mayneed to revise your orientation to component locationaccordingly.
UPFLOW
DOWNFLOW
HORIZONTALLEFT
AIRFLOW AIRFLOW
AIRFLOW
AIRFLOW
HORIZONTALRIGHT
A93041
Fig. 2 -- Multipoise Orientation
ELECTROSTATIC DISCHARGE (ESD)PRECAUTIONS
UNIT DAMAGE HAZARD
Failure to follow this caution may damage furnacecomponents.
Failure to follow this caution may damage furnacecomponents. Electrostatic discharge can affect electroniccomponents. Take precautions during furnace installationand servicing to protect the furnace electronic control.Precautions will prevent electrostatic discharges frompersonnel and hand tools which are held during theprocedure. These precautions will help to avoid exposingthe control to electrostatic discharge by putting the furnace,the control, and the person at the same electrostaticpotential.
CAUTION!
1. Disconnect all power to the furnace. DO NOT TOUCHTHE CONTROL OR ANY WIRE CONNECTED TOTHE CONTROL PRIOR TO DISCHARGING YOURBODY’S ELECTROSTATIC CHARGE TO GROUND.
2. Firmly touch a clean, unpainted, metal surface of thefurnace chassis which is close to the control. Tools held ina person’s hand during grounding will be satisfactorilydischarged.
3. After touching the chassis, you may proceed to service thecontrol or connecting wires as long as you do nothing thatrecharges your body with static electricity (for example;DO NOT move or shuffle your feet, DO NOT touchungrounded objects, etc.).
4. If you touch ungrounded objects (recharge your body withstatic electricity), firmly touch furnace again beforetouching control or wires.
5. Use this procedure for installed and uninstalled(ungrounded) furnaces.
6. Before removing a new control from its container,discharge your body’s electrostatic charge to ground toprotect the control from damage. If the control is to beinstalled in a furnace, follow items 1 through 5 beforebringing the control or yourself into contact with thefurnace. Put all used AND new controls into containersbefore touching ungrounded objects.
7. An ESD service kit (available from commercial sources)may also be used to prevent ESD damage.
CARE AND MAINTENANCEFor continuing high performance and to minimize possiblefurnace failure, it is essential that maintenance be performedannually. Consult your local dealer for maintenance andmaintenance contract availability.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personalinjury or death.
Turn off the gas and electrical supplies to the unit beforeperforming any maintenance or service. Follow theoperating instructions on the label attached to the furnace.
! WARNING
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WASHABLEFILTER
FILTERSUPPORT
FILTERRETAINER
WASHABLE FILTER ORDISPOSABLE MEDIA FILTERIN FILTER CABINET
A00232
Fig. 3 -- Bottom Filter Arrangement
The minimum maintenance that should be performed on thisequipment is as follows:
1. Check and clean or replace air filter each month as needed.
2. Check blower motor and wheel for cleanliness annually.
3. Check electrical connections for tightness and controls forproper operation each heating season. Service asnecessary.
4. Check for proper condensate drainage. Clean as necessary.
5. Check for blockages in combustion--air and vent pipesannually.
6. Check burners for cleanliness annually.
A. CLEANING AND/OR REPLACING AIR FILTERThe air filter arrangement may vary depending on the applicationor orientation.
CARBONMONOXIDE POISONING HAZARD
Failure to follow this warning could result in personalinjury or death.
Never operate unit without a filter or with the blower accesspanel removed. Operating a unit without a filter or with theblower access door removed could cause damage to thefurnace blower motor. Dust and lint on internal parts offurnace can cause a loss of efficiency.
! WARNING
NOTE: If the filter has an airflow direction arrow, the arrowmust point toward the blower.To clean or replace filters, proceed as follows:If filter is installed in filter cabinet adjacent to furnace:
1. Turn off electrical supply to furnace.
2. Remove filter cabinet door.
3. Slide filter out of cabinet.
4. If equipped with permanent, washable filter, clean filter byspraying cold tap water through filter in opposite directionof airflow. Rinse filter and let dry. Oiling or coating of thefilter is not recommended.
5. If equipped with factory specified disposable media filter,replace only with a factory specified media filter of thesame size.
FILTERRETAINER
WASHABLEFILTER
IN FURNACE
WASHABLE FILTER ORDISPOSABLE MEDIAFILTER IN FILTER CABINET
A00233
Fig. 4 -- Filter Installed for Side Inlet
6. Slide filter into cabinet.
7. Replace filter cabinet door.
8. Turn on electrical supply to furnace.
If filter is installed in furnace blower compartment:
1. Turn off electrical supply to furnace.
2. Remove main furnace door and blower access panel.
3. Release filter retainer wire. (See Fig. 3 or 4.)
NOTE: Filters shown in Fig. 3 and 4 can be in furnace blowercompartment or in filter cabinet, but not in both.
4. Slide filter out of furnace.
5. Furnaces are equipped with permanent, washable filter(s).Clean filter by spraying cold tap water through filter inopposite direction of airflow.
6. Rinse filter and let dry. Oiling or coating filter is notrecommended.
7. Slide filter into furnace.
8. Recapture filter retaining wire.
9. Replace blower access panel and main furnace door.
10. Turn on electrical supply to furnace.
B. BLOWER MOTOR AND WHEEL MAINTENANCETo ensure long life, economy, and high efficiency, cleanaccumulated dirt and grease from blower wheel and motorannually.
The inducer and blower motors are pre--lubricated and require noadditional lubrication. These motors can be identified by theabsence of oil ports on each end of the motor.
The following items should be performed by a qualified servicetechnician.
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PLUG
CAP
COLLECTOR BOX DRAIN TUBE (BLUE &
WHITE STRIPED)
INDUCER HOUSING (MOLDED) DRAIN
TUBE (BEHIND COLLECTOR BOX
DRAIN TUBE)
COLLECTOR BOX TUBE (PINK)
COLLECTOR BOX DRAIN TUBE (BLUE)
COLLECTOR BOX TUBE (GREEN ,
ROUTES BEHIND INDUCER)
FIELD- INSTALLED FACTORY- SUPPLIED
DRAIN TUBE COUPLING (LEFT
DRAIN OPTION)
FIELD- INSTALLED FACTORY- SUPPLIED
DRAIN TUBE
FIELD- INSTALLED FACTORY- SUPPLIED ½ - IN. CPVC STREET
ELBOWS (2) FOR LEFT DRAIN OPTION
FIELD- INSTALLED FACTORY- SUPPLIED
DRAIN TUBE COUPLING (LEFT
DRAIN OPTION)
CONDENSATE TRAP
A07274
Fig. 5 -- Factory--Shipped Upflow Tube Configuration (Shown with Blower Access Panel Removed)
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door and blower access panel.
3. Disconnect wiresAll factory wires can be left connected, but fieldthermostat connections may need to be disconnecteddepending on their length and routing.
4. Position control box, transformer, and door switchassembly to right side of furnace casing.
5. If condensate trap is located in left-- or right--hand side offurnace casing, proceed to item 6. Otherwise remove trapand tubing as described below (See Fig. 5.):
a. Disconnect field drain connection from condensate trap.
b. Disconnect drain and relief port tubes from condensatetrap.
c. Remove condensate trap from blower shelf.
6. Remove screws securing blower assembly to blower shelfand slide blower assembly out of furnace. Detach groundwire and disconnect blower motor harness plugs fromblower motor.
NOTE: Blower wheel is fragile. Use care.
7. Clean blower wheel and motor by using a vacuum withsoft brush attachment. Be careful not to disturb balanceweights (clips) on blower wheel vanes. Do not bend wheelor blades as balance will be affected.
8. If greasy residue is present on blower wheel, removewheel from the blower housing and wash it with anappropriate degreaser. To remove wheel:
a. Mark blower wheel location on shaft before disassemblyto ensure proper reassembly.
b. Loosen setscrew holding blower wheel on motor shaft.
NOTE: Mark blower mounting arms and blower housing soeach arm is positioned at the same hole location duringreassembly.
c. Mark blower wheel orientation and cutoff plate locationto ensure proper reassembly.
d. Remove screws securing cutoff plate and remove cutoffplate from housing.
e. Remove bolts holding motor mounts to blower housingand slide motor and mounts out of housing.
f. Remove blower wheel from housing.
g. Cleanwheel per instructions on degreaser cleaner.Do notget degreaser in motor.
9. Reassemble motor and blower wheel by reversing items8b through 8f. Ensure wheel is positioned for properrotation.
NOTE: Be sure to attach ground wire and reconnect blowerharness plugs to blower motor.
10. Reinstall blower assembly in furnace.
11. Reinstall condensate trap and tubing if previouslyremoved.
a. Reinstall condensate trap in hole in blower shelf.
b. Connect condensate trap drain tubes. See Fig. 5 or tubingdiagram on main furnace door for proper tube location.
(1.) Connect 1 tube (blue or blue andwhite striped) fromcollector box.
(2.) Connect 1 tube (violet or unmarked) from inducerhousing.
(3.) Connect one tube (relief port, green or pink) fromcollector box.
c. Connect field drain to condensate trap.
NOTE: Ensure tubes are not kinked or pinched, as this willaffect operation.
12. Reinstall control box, transformer, and door switchassembly on blower shelf.
13. Reconnect wires.
a. Refer to furnace wiring diagram and connect thermostatleads if previously disconnected. (See Fig. 21.)
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ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personalinjury or death.
Blower access panel door switch opens 115--v power tofurnace control. No component operation can occur.Caution must be taken when manually closing this switchfor service purposes.
! WARNING
14. Turn on electrical supply. Manually close blower accesspanel door switch. Use a piece of tape to hold switchclosed. Check for proper rotation and speed changesbetween heating and cooling by jumpering R to G and Rto Y/Y2 on furnace control thermostat terminals. (See Fig.15.)
15. If furnace is operating properly, release blower accesspanel door switch, replace blower access panel, andreplace main furnace door.
C. CLEANING BURNERSThe following items should be performed by a qualified servicetechnician. If the burners develop an accumulation of light dirt ordust, they may be cleaned by using the following procedure:
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Remove burner box cover.
4. Using backup wrench, disconnect gas supply pipe fromfurnace gas control valve.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in furnacecomponent damage.
Label all wires prior to disconnection when servicingcontrols. Wiring errors can cause improper and dangerousoperation.
CAUTION!
5. Remove wires from gas valve. Note location forreassembly.
6. Remove burner box pressure tube from gas valve regulatorfitting.
7. Unplug igniter from harness.
8. Remove igniter leads from slot in manifold grommet.
9. Remove screws that secure manifold to burner box. (SeeFig. 6.)
NOTE: Do not remove burner box from cell panel.
10. Remove manifold, orifices, and gas valve as 1 assembly.
11. Remove screws attaching burner assembly in burner box.
NOTE: Use care when removing and reinstalling burners not tostrike the hot surface igniter.
12. Remove burner assembly from burner box. NOTE: Allburners are attached to burner bracket and can be removedas 1 assembly.
13. Clean burners with soft brush and vacuum.
14. Reinstall manifold, orifice, and gas valve assembly inburner box. Ensure manifold seal grommet is installedproperly and burners fit over orifices.
15. Reinsert the igniter wires in the slot in the manifoldgrommet, dressing the wires to ensure there is no tensionon the igniter itself. (See Fig. 7.)
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personalinjury or death.
Igniter wires must be securely placed in slot in manifoldgrommet or else they could become pinched or severed andelectrically shorted.
! WARNING
16. Reconnect wires to gas valve and igniter. Refer to furnacewiring diagram for proper wire location.
17. Reinstall burner box pressure tube to gas valve regulatorfitting.
18. Reinstall gas supply pipe to furnace gas control valveusing backup wrench on gas valve to prevent rotation andimproper orientation.
GAS CONTROL
VALVE
THROTTLING VALVE
MANIFOLD
GASKET
CELLPANEL
MANIFOLD MOUNTING SCREWS
GAS VALVE REGULATOR FITTING
A07562
Fig. 6 -- Burner Box Assembly
58MVC
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IGNIT ER WIRES MUST BE PLACED IN THIS SLOT
A05074
Fig. 7 -- Igniter Wire Placement
PRIMARY HXINLET OPENINGS
A96305
Fig. 8 -- Cleaning Inlet Openings ofPrimary Heat Exchangers
PAM
RTV
A93087
Fig. 9 -- Combustion--air IntakeHousing Gasket Repair
58MVC
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A07563
Fig. 10 -- Furnace Pressure and Drain Tubing Diagram
����BURNER FLAME
BURNER
MANIFOLD
A89020
Fig. 11 -- Burner Flame
NOTE: Use propane gas resistant pipe dope to prevent gas leaks.DO NOT use Teflon tape.
FIRE, EXPLOSION, UNIT DAMAGE HAZARD
Failure to follow this warning could result in personalinjury, death, or property damage,.
Gas valve switch MUST be facing forward or tilted slightly.
! WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personalinjury or death or property damage.
Never test for gas leaks with an open flame. Use acommercially available soap solution made specifically forthe detection of leaks to check all connections.
! WARNING58MVC
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19. Replace burner box cover.
20. Turn on gas and electrical supplies to furnace.
21. Check for gas leaks.
22. Replace main furnace door.
D. CLEANING HEAT EXCHANGERSThe following items should be performed by a qualified servicetechnician.
Primary Heat Exchangers
If the heat exchangers get an accumulation of light dirt or dust onthe inside, they may be cleaned by the following procedure:
NOTE: If the heat exchangers get a heavy accumulation of sootand carbon, both the primary and secondary heat exchangersshould be replaced rather than trying to clean them thoroughlydue to their intricate design. A build--up of soot and carbonindicates that a problem exists which needs to be corrected, suchas improper adjustment of manifold pressure, insufficient or poorquality combustion air, improper vent termination, incorrect sizeor damaged manifold orifice(s), improper gas, or a restricted heatexchanger (primary or secondary). Action must be taken tocorrect the problem.
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in furnacecomponent damage.
Label all wires prior to disconnection when servicingcontrols. Wiring errors can cause improper and hazardousoperation.
CAUTION!
3. Disconnect wires or connectors to flame rollout switch,gas valve, igniter, and flame sensor.
4. Disconnect combustion--air intake pipe from intakehousing.
5. Remove the pressure switch tube from intake housing.
6. Remove screws attaching intake housing to burner box,and rotate intake housing away from burner box forremoval.
7. Using backup wrench, disconnect gas supply pipe fromfurnace gas control valve.
8. Disconnect pressure tubing from gas valve.
9. Remove two screws attaching top filler panel and rotateupwards to gain access to screws attaching burner box tocell panel.
10. Remove screws attaching burner box to cell panel. (SeeFig. 6.)
NOTE: Burner box, cover, manifold, gas valve, and burnerassembly should be removed as one assembly.
11. Clean heat exchanger openings with a vacuum and a softbrush. (See Fig. 8.) NOTE: After cleaning, inspect the heatexchangers to ensure they are free of all foreign objectsthat may restrict flow of combustion products.
12. Reverse items 4 through 10 for reassembly.
NOTE: Be sure burner box gasket is installed between burnerbox and cell panel. (See Fig. 6.) If gasket is damaged, replace it.
NOTE: Inspect combustion--air intake housing. If foamed gasketwas removed, check for any damage. If gasket is damaged in anyway, it must be repaired. To repair, remove damaged gasketsection, apply sealant releasing agent such as PAM cooking sprayor equivalent (must not contain corn nor canola oil, halogenatedhydrocarbons nor aromatic content, to prevent inadequate seal
from occurring) to burner box and apply a small bead of G.E.RTV 162, G.E. RTV 6702, or Dow--Corning RTV 738 sealant toedge of combustion--air intake housing. (See Fig. 9.)
UNIT MAY NOT OPERATE
Failure to follow this caution may result in improper unitoperation.
Failure to attach ground wire to an adequate casing groundmay cause the furnace control to lock out. The ground wirefrom the gas valve MUST be attached to the burner boxattachment screw.
CAUTION!
13. Refer to furnace wiring diagram and reconnect wires toflame rollout switch, gas valve, igniter, and flame sensor.
14. Reconnect pressure switch tubes to gas valve and intakehousing. Refer to tube routing label on main furnace doorfor proper tube location. (See Fig. 10.) Be sure tubes arenot kinked.
15. Turn on gas and electrical supplies to furnace.
16. Check furnace operation through 2 complete heatoperating cycles. Look through sight glass in burnerenclosure to check burners. Burner flames should be clearblue, almost transparent. (See Fig. 11.)
17. Check for gas leaks.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personalinjury, death, or property damage.
Never test for gas leaks with an open flame. Use acommercially available soap solution made specifically forthe detection of leaks to check all connections.
! WARNING
18. Replace main furnace door.
E. Secondary Heat ExchangersNOTE: The condensing side (inside) of the secondary heatexchangers CANNOT be serviced or inspected. A small numberof bottom outlet openings can be inspected by removing theinducer assembly. See Flushing Collector Box and DrainageSystem section for details on removing inducer assembly.
F. FLUSHING COLLECTOR BOX AND DRAINAGESYSTEM1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Disconnect inducer motor and pressure switch wires orconnectors.
4. Disconnect pressure switch tubes.
5. Disconnect vent pipe from inducer housing outlet byloosening coupling clamp on inducer outlet.
6. Disconnect drain tube from inducer housing. (See Fig.10.)
NOTE: Ensure the drain tube disconnected from the inducerhousing is higher than the collector box opening or water willflow out of tube.
7. Remove inducer housing assembly by removing 4 boltsattaching assembly to cell panel.
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UNIT DAMAGE HAZARD
Failure to follow this caution may result in furnacecomponent damage.
DO NOT use wire brush or other sharp object to inspect ordislodge materials in secondary heat exchangers as cuttingof the secondary heat exchanger protective coating mayoccur. Flush with water only.
CAUTION!
8. Flush inside of collector box with water until dischargefrom condensate trap is clean and runs freely.
9. Inspect inside area of collector box for any pieces offoreign materials and remove them if present.
10. Reassemble inducer assembly by reversing items 5--7.Tighten the vent coupling clamp screw(s) to 15 in.--lb oftorque.
NOTE: If seal between the inducer housing and the collectorbox is damaged in any way, it must be repaired. To repair, applysealant releasing agent such as PAM cooking spray or equivalent(must not contain corn nor canola oil, halogenated hydrocarbonsnor aromatic content, to prevent inadequate seal from occurring)to inducer housing. (See Fig. 12.) Apply a small bead of G.E.RTV 162, G.E. RTV 6702, or Dow--Corning RTV 738 sealant togroove in collector box.
11. Refer to furnace wiring diagram and reconnect wires toinducer motor and pressure switches or connectors.
12. Reconnect pressure tubes to pressure switches. Seediagram on main furnace door for proper location of tubes.Be sure tubes are not kinked. (See Fig. 10.)
13. Turn on gas and electrical supplies to furnace.
14. Check furnace operation through two complete heatoperating cycles. Check area below inducer housing, ventpipe, and condensate trap to ensure no condensate leaksoccur. If leaks are found, correct the problem.
15. Check for gas leaks.
16. Replace main furnace door.
RTV
PAM
A93081
Fig. 12 -- Gasket on Collector Box
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personalinjury, death or property damage.
Never test for gas leaks with an open flame. Use acommercially available soap solution made specifically forthe detection of leaks to check all connections.
! WARNING
G. SERVICING HOT SURFACE IGNITER
BURN HAZARD
Failure to follow this caution may result in personal injury.
Allow igniter to cool before removal. Normal operatingtemperatures exceed 2000_.
CAUTION!
The igniter does NOT require annual inspection. Check igniterresistance before removal.
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Disconnect igniter wire connection.
4. Check igniter resistance. Igniter resistance is affected bytemperature. Only check resistance when the igniter is atroom temperature.
a. Using an ohm meter, check resistance across both igniterleads in connector.
b. Cold reading should be between 40 ohms and 70 ohms.
5. Remove igniter assembly.
a. Remove burner box cover.
b. Remove igniter wires from slot in manifold grommet.(See Fig. 7.)
c. Using a 1/4--in. driver, remove the single screw securingthe igniter bracket to the burnerbox bracket (See Fig. 13.)and carefully withdraw the igniter and bracket assemblythrough the front of the burner box without striking theigniter on surrounding parts. Note that the igniter brackethas a handle that extends to the front of the burner boxto aid in handling. (See Fig. 13.)
d. Inspect igniter for signs of damage or failure.
BRACKET
IGNITER
9/16˝
11/16˝
EXTENDED IGNITERBRACKET HANDLE
IGNITER BRACKETMOUNTING SCREW
A05075
Fig. 13 -- Igniter Bracket
58MVC
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UNIT DAMAGE HAZARD
Failure to follow this caution may result in prematurefailure of the igniter.
The igniter is fragile. DO NOT allow it to hit burner boxparts while removing or replacing it.
CAUTION!
e. If replacement is required, replace igniter on igniterbracket and then install assembly into burnerbox to avoiddamage to the igniter.
6. To replace igniter and bracket assembly, reverse items 5athrough 5d.
7. Reconnect igniter wire connection and insert the igniterwires in the slot in the manifold grommet, dressing theigniter wires to ensure there is no tension on the igniteritself. (See Fig.7.)
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personalinjury or death.
Igniter wires must be securely placed in slot in manifoldgrommet or else they could become pinched or severed andelectrically shorted.
! WARNING
2-5/32˝A04181
Fig. 14 -- Igniter
8. Reinstall burner box cover.
9. Turn on gas and electrical supplies to furnace.
10. Verify igniter operation by initiating control boardself--test feature or by cycling thermostat.
11. Replace main furnace door.
H. ELECTRICAL CONTROLS AND WIRING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personalinjury or death.
There may be more than 1 electrical supply to the unit.Check accessories and cooling unit for additional electricalsupplies.
! WARNING
The electrical ground and polarity for 115--v wiring must bemaintained properly. Refer to Fig. 15 for field wiring informationand to Fig. 21 for unit wiring information.
NOTE: If the polarity is not correct or furnace is not properlygrounded, the STATUS LED on the furnace control will flashrapidly and prevent the furnace from operating. The controlsystem also requires an earth ground for proper operation of thefurnace control and flame sensor.The 24--v circuit contains an automotive--type, 3--amp fuselocated on the furnace control. (See Fig. 16.) Any direct shorts ofthe 24--v wiring during installation, service, or maintenance willcause this fuse to blow. If fuse replacement is required, use ONLYa fuse of identical size. The furnace control LED will flash statuscode 24 when fuse needs to be replaced.With power to the unit disconnected, check all electricalconnections for tightness. Tighten all screws on electricalconnections. If any smoky or burned connections are found,disassemble the connection, clean all parts, strip wire, andreassemble properly and securely.Reconnect electrical supply to unit and observe unit through 1complete operating cycle and check for proper operation.
I. CHECKING HEAT TAPE OPERATION(IF APPLICABLE)
In applications where the ambient temperature around the furnaceis 32_F or lower, freeze protection measures are required. If thisapplication is where heat tape has been applied, check to ensure itwill operate when low temperatures are present.
NOTE: Heat tape, when used, should be wrapped around thecondensate drain trap and drain line. There is no need to use heattape within the furnace casing. Most heat tapes are temperatureactivated, and it is not practical to verify the actual heating of thetape. Check the following:
1. Check for signs of physical damage to heat tape such asnicks, cuts, abrasions, gnawing by animals, etc.
2. Check for discolored heat tape insulation. If any damageor discolored insulation is evident, replace heat tape.
3. Check that heat tape power supply circuit is on.
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in furnacecomponent failures or water property damage.
If this furnace is to be operated in an unconditioned spacewhere the ambient temperatures may be 32_F (0_C) orlower, freeze protection measures must be taken. SeeCONDENSATE DRAIN PROTECTION section ofInstallation, Start--up, and Operating Instructions. (See Fig.17.)
CAUTION!
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115-VOLT FIELD-SUPPLIED
FUSEDDISCONNECT
JUNCTIONBOX
CONTROLBOX
24-VOLTTERMINALBLOCK
THREE-WIREHEATING-
ONLY
FIVEWIRE
NOTE 2
NOTE 1
1-STAGETHERMOSTATTERMINALS
FIELD-SUPPLIEDFUSED DISCONNECT
CONDENSINGUNIT
FURNACE
COM
R
W C Y R G
GND
GND
FIELD 24-VOLT WIRINGFIELD 115-, 208/230-, 460-VOLT WIRINGFACTORY 24-VOLT WIRINGFACTORY 115-VOLT WIRING
Connect Y/Y2-terminal as shown for proper operation.Some thermostats require a "C" terminal connection as shown.If any of the original wire, as supplied, must be replaced, usesame type or equivalent wire.
208/230- OR460-VOLTTHREEPHASE
208/230-VOLTSINGLEPHASE
WHT
BLK
WHT
BLK
A95236
W/W1
W2
Y/Y2
G
NOTES: 1.2.3.
A95236
Fig. 15 -- Field Wiring
J. WINTERIZING
UNIT DAMAGE HAZARD
Failure to follow this caution may result in furnacecomponent damage.
Freezing condensate left in the furnace may damage thefurnace.
CAUTION!
If the furnace will be off for an extended period of time in astructure where the temperature will drop to 32_F (0_C) orbelow, winterize as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door.
3. Disconnect upper inducer housing drain connection capfrom inducer housing. (See Fig. 18.)
4. Connect field--supplied 1/2--in. I.D. inducer housing tubeto upper inducer housing drain connection.
5. Insert funnel in tube and pour one quart of antifreeze,propylene glycol (RV, swimming pool antifreeze, orequivalent) into funnel/tube until it is visible at pointwhere condensate enters open drain. (See Fig. 19.)
UNIT DAMAGE HAZARD
Failure of plastic components may occur.
Do not use ethylene glycol (Prestone II antifreeze/coolant orequivalent automotive type).
CAUTION!
6. Replace drain connection cap and clamp to inducerhousing.
7. Replace main furnace door.
8. Propylene glycol need not be removed before restartingfurnace.
WIRING DIAGRAMSSee Fig. 15, 16 and 21 for the Deluxe 4--Way Multipoise Furnacewiring diagrams.
TROUBLESHOOTINGUse the troubleshooting guide, the status code LED on thefurnace control and the component test to isolate furnaceoperation problems.
A more detailed troubleshooting guide is available from yourdistributor.
For an explanation of status codes, refer to service label locatedon back of main furnace door (See Fig. 20.)
The furnace control stores all status codes for a period of 72hours, regardless of 115--v or 24--v power interruption.
NOTE: Removing blower access panel opens blower accesspanel door switch and terminates 115--v power to furnace control.Before removing blower access panel or turning off 115--v power,look into blower access panel sight glass for current LED status.
1. To retrieve status code, proceed with the following:
NOTE: NO thermostat signal may be present at furnace controland all blower time delay periods must be completed.
a. Leave 115--v power to furnace turned on.
b. Remove main furnace door.
c. Look into bloweraccesspanel sight glass for currentLEDstatus code.
d. Remove blower access panel.
e. Turn setup switch SW1--1 to ON position. (See Fig. 16or 21 for location.)
f. Manually close blower access panel door switch. Use apiece of tape to hold switch closed.
58MVC
12
ELECTRICAL SHOCK, UNIT MAY NOT OPERATEHAZARD
Failure to follow this warning could result in personalinjury or death.
Blower access panel door switch opens 115--v power tofurnace control. No component operation can occur unlessswitch is closed. Caution must be taken when manuallyclosing this switch for service purposes.
! WARNING
g. TheAMBER LEDwill flash the status codes in the orderof occurence. Record status codes until status code 11flashes (1 short and 1 long).
h. After status code #11 flashes, the status codes will repeatuntil setup switch SW1--1 is turned off.
i. Remove tape to release blower access panel door switchand replace blower access panel.
j. Operate furnace through 1 heat cycle to test for properoperation and check LED status.
k. If furnace is operating properly and LEDs indicateproperoperation, replace main furnace door.
2. Status codes are erased after 72 hours or they can bemanually erased by performing the following procedure:
a. Look into bloweraccesspanel sight glass for currentLEDstatus code.
b. Remove blower access panel.
c. Turn setup switch SW1--1 to ON position. (See Fig. 16or 21 for location.)
d. Jumper thermostat terminals R, W/W1, and Y/Y2 onfurnace control.
e. Manually close blower access panel door switch. Use apiece of tape to hold switch closed.
f. After status code 11 flashes for at least 2 times, removeR, W/W1, and Y/Y2 jumpers.
g. Turn setup switch SW1--1 to OFF position.
h. Remove tape to release blower access panel door switchand replace blower access panel.
i. Operate furnace through 1 heat cycle to check for properoperation and check LED status.
j. If furnace is operating properly and LEDs indicateproperoperation, replace main furnace door.
3. The control can also assist in troubleshooting byperforming a Component Test. The Component Test willfunctionally operate all furnace components, except thegas valve.
NOTE: The component test feature will not operate if thefurnace control is receiving any thermostat signals or until alltime delays have expired.
a. To initiate Component Test proceed with the following:
(1.) Leave 115--v power to furnace turned on.
(2.) Remove main furnace door.
(3.) Remove blower access panel.
(4.) Turn setup switch SW1--6 to ON position.
(5.) Manually close blower access panel door switch.Use a piece of tape to hold switch closed.
b. When items (1) through (5) above have been completed,the following will occur:
(1.) Inducer motor operates at medium speed throughstep (3), then turns off.
(2.) After waiting for 15 sec, hot surface igniter isenergized for 15 sec, then de--energized.
(3.) Main blowermotor operates atmidrange airflow for15 sec, then turns off.
(4.) After component operation test is completed, 1 ormore fault codes (11, 25, 41, or 42) will flash. Seeservice label on back of main furnace door or Fig.20 for explanation of codes.
NOTE: To repeat component test, turn setup switch SW1--6 toOFF and then back to ON.
c. After component test, perform the following:
(1.) Remove tape to release blower access panel doorswitch and turn setup switch SW1--6 to OFFposition.
(2.) Replace blower access panel.
(3.) Operate furnace through 1 heat cycle to check forproper operation and check LED status.
(4.) If furnace is operating properly and LEDs indicateproper operation, replace main furnace door.
58MVC
13
24-V THERMOSTAT TERMINALS
PL2 – HOT SURFACE IGNITER & INDUCER
MOTOR CONNECTOR
115-VAC (L2) NEUTRAL CONNECTIONS
115-VAC (L1) LINE VOLTAGE CONNECTIONS
EAC-1 TERMINAL (115 -VAC 1.0 AMP MAX.)
PL1 – LOW VOLTAGE MAIN HARNESS CONNECTOR
PL3 – ECM BLOWER HARNESS
CONNECTOR
TRANSFORMER 24-VAC CONNECTIONS
3-AMP FUSE
STATUS AND COMM LED LIGHTS
SW1 SETUP SWITCHES AND BLOWER OFF-
DELAY
MODEL PLUG CONNECTOR
AIR CONDITIONING (A/C) AIRFLOW
SETUP SWITCHES
USER INTERFACE OR ADVANCED
PRODUCT MONITOR
CONNECTOR
CONTINUOUS FAN (CF) AIRFLOW
SETUP SWITCHES OAT
CONNECTOR
HUMIDIFIER TERMINAL (24-VAC
0.5 AMP MAX.
ACRDJ – AIR CONDITIONING RELAY DISABLE
JUMPER
FLASH UPGRADE
CONNECTOR (FACTORY
ONLY)
SW4 SETUP SWITCHES
BOARD SERIAL NUMBER
EXAMPLE: V12 HK42FZ022 3407
SOFTWARE VERSION NUMBER
DATE CODE
PART NUMBER
A07422
Fig. 16 -- Variable Capacity Furnace Control
58MVC
14
32oF MINIMUM INSTALLEDAMBIENT OR FREEZEPROTECTION REQUIRED
A93058
Fig. 17 -- Freeze Protection
A99118
Fig. 18 -- Inducer Housing Drain Tube
A99119
Fig. 19 -- Funnel in Drain Tube and AntifreezeRunning Through Trap
58MVC
15
A07564
Fig. 20 -- Service Label
58MVC
16
A06677
Fig. 21 -- Wiring Diagram
58MVC
17
Is A
MBE
R LE
D s
tat
us li
ght o
n?
Is th
ere
24V
at S
EC-1
and
SEC
-2?
Is th
ere
115V
at L
1 an
d L2
?
Repl
ace
furn
ace
cont
rol.
Is d
oor s
witc
h cl
osed
?
Repl
ace
tran
sfor
mer
.
Repl
ace
door
sw
itch.
Is th
ere
115V
goi
ng to
sw
itch?
Clos
e do
or s
witc
h.
Is c
ircui
t bre
aker
clo
sed?
Chec
k fo
r con
tinui
ty in
wire
from
circ
uit
brea
ker t
o fu
rnac
e.
Clos
e ci
rcui
t bre
aker
and
go
back
to
STA
RT.
Is A
MBE
R LE
D s
tatu
s li
ght b
linki
ng
rapi
dly
with
out a
pau
se?
Chec
k fo
r cor
rect
line
vol
tage
pol
arity
. If
units
are
twin
ned,
che
ck fo
r pro
per l
ow-
volta
ge (2
4V) t
rans
form
er p
hasi
ng.
Is A
MBE
R LE
D s
tatu
s li
ght b
linki
ng
ON
/OFF
slo
wly
with
a c
ombi
natio
n of
Det
erm
ine
stat
us c
ode.
The
sta
tus
code
dete
rmin
ed b
y th
e nu
mbe
r of s
hort
To re
call
prev
ious
sta
tus
code
s di
scon
nect
the
R th
erm
osta
t con
nect
ion,
rese
t pow
er, a
nd p
ut s
etup
sw
itch
SW1-
1 in
the
ON
pos
ition
. Th
e A
MBE
R LE
D
will
repe
at.
Stat
us c
odes
ar
e er
ased
aft
er 7
2 ho
urs
or c
an b
e m
anua
lly e
rase
d by
put
ting
setu
p sw
itch
SW1-
1 in
the
ON
pos
ition
an
d ju
mpe
ring
R, W
/W1,
and
Y/Y
2 si
mul
tane
ousl
y
setu
p sw
itch
SW1-
1 in
the
OFF
pos
ition
.
Was
ther
e a
prev
ious
sta
tus
code
oth
er
than
#11
?
Go
to s
ectio
n be
low
for t
he s
tatu
s co
de
Doe
s th
e co
ntro
l res
pond
to W
/W1,
W2,
Y1
, Y/Y
2, a
nd G
(24V
) th
erm
osta
t si
gnal
s?
Run
syst
em th
roug
h a
low
-hea
t, m
ediu
m-
heat
, hig
h-he
at, o
r coo
ling
cycl
e to
che
ck
oper
atio
n. S
tatu
s co
des
are
eras
ed a
fter
72
hou
rs o
r can
be
man
ually
era
sed
by
putt
ing
setu
p sw
itch
SW1-
1 in
the
ON
po
sitio
n an
d ju
mpe
ring
R, W
/W1,
and
Y/
Y2 s
imul
tane
ousl
y un
til s
tatu
s co
de
Is 2
4V p
rese
nt a
t W/W
1, W
2, Y
1, Y
/Y2
or
G th
erm
osta
t ter
min
als
on th
e fu
rnac
e co
ntro
l?
Chec
k ro
om th
erm
osta
t or
inte
rcon
nect
ing
cabl
e.
Dis
conn
ect a
ll th
e th
erm
osta
t wire
s fr
om
the
furn
ace
cont
rol.
Doe
s th
e pr
oble
m re
peat
whe
n us
ing
a ju
mpe
r wire
? Re
plac
e fu
rnac
e co
ntro
l.
The
ther
mos
tat i
s no
t com
patib
le w
ith th
e fu
rnac
e co
ntro
l. E
ither
inst
all a
bal
last
re
sist
or, c
onne
ct th
e Co
m24
V th
erm
osta
t te
rmin
al to
the
ther
mos
tat,
or re
plac
e th
e th
erm
osta
t.
YES
NO
YES
YES
YES
YES
YES
S
EY
S
EY
S
EY
YES
STA
RT
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Trou
bles
hoot
ing
Gui
de
A07581
58MVC
18
11
NO
PRE
VIO
US
COD
E –
Stat
us c
odes
are
er
ased
aft
er 7
2 ho
urs
or c
an b
e m
anua
lly
eras
ed b
y pu
ttin
g se
tup
switc
h SW
1-1
in
the
ON
pos
ition
and
jum
perin
g R,
W/W
1,
and
Y/Y2
sim
ulta
neou
sly
until
sta
tus
code
#1
1 is
flas
hed.
Run
sys
tem
thro
ugh
a lo
w-
heat
, hig
h-he
at, o
r coo
ling
cycl
e to
che
ck
syst
em.
12
BLO
WER
ON
AFT
ER P
OW
ER U
P –
(115
V O
R 24
V) –
Nor
mal
ope
ratio
n.
Blow
er ru
ns fo
r 90
seco
nds,
if u
nit i
s po
wer
ed u
p du
ring
a ca
ll fo
r hea
t (R-
W/W
1 cl
osed
) or w
hen
(R-W
/W1
open
s)
durin
g th
e bl
ower
on-
dela
y pe
riod.
13
LIM
IT C
IRCU
IT L
OCK
OU
T –
Lock
out
occu
rs if
the
limit
or
flam
e ro
llout
sw
itch
is
open
long
er th
an 3
min
utes
or 1
0 su
cces
sive
lim
it tr
ips
occu
rred
dur
ing
high
-he
at.
Cont
rol w
ill a
uto-
rese
t aft
er 3
hou
rs.
See
code
33.
14
IGN
ITIO
N L
OCK
OU
T –
Syst
em fa
iled
to
igni
te g
as a
nd p
rove
flam
e in
4 a
ttem
pts.
Co
ntro
l will
aut
o-re
set a
fter
3 h
ours
. Se
e st
atus
cod
e 34
.
21
GA
S H
EATI
NG
LO
CKO
UT
– Tu
rn o
ff po
wer
and
wai
t 5 m
inut
es to
retr
y. C
heck
fo
r:
- St
uck
clos
ed g
as v
alve
rela
y on
con
trol
.
- M
isw
ire o
r sho
rt to
gas
val
ve w
ire.
22
ABN
ORM
AL
FLA
ME-
PRO
VIN
G S
IGN
AL
Flam
e is
pro
ved
whi
le g
as v
alve
is d
e-en
ergi
zed.
Ind
ucer
will
run
until
faul
t is
clea
red.
Che
ck fo
r:
- St
uck
open
or l
eaky
gas
val
ve.
23
PRES
SURE
SW
ITCH
DID
NO
T O
PEN
–
Chec
k fo
r: -
Obs
truc
ted
pres
sure
tube
. -
Pres
sure
sw
itch
stuc
k cl
osed
.
24
SECO
ND
ARY
VO
LTA
GE
FUSE
IS O
PEN
Ch
eck
for:
-
Shor
t circ
uit i
n se
cond
ary
volta
ge (2
4V)
wiri
ng in
clud
ing
ther
mos
tat l
eads
. D
isco
nnec
t the
rmos
tat l
eads
to is
olat
e sh
ort c
ircui
t.
32
LOW
-HEA
T PR
ESSU
RE S
WIT
CH D
ID
NO
T CL
OSE
OR
REO
PEN
ED –
If o
pens
du
ring
blow
er o
n-de
lay
perio
d, b
low
er w
ill
com
e on
for t
he s
elec
ted
blow
er o
ff-de
lay.
If
open
s w
ithin
5 m
inut
es a
fter
igni
tion
the
next
hea
ting
cycl
e w
ill b
e re
stric
ted
to
high
-hea
t. C
heck
for:
-
Prop
er v
ent s
izin
g.
- Lo
w in
let g
as p
ress
ure
(if L
GPS
use
d).
- Re
stric
ted
com
bust
ion
air s
uppl
y.
- D
isco
nnec
ted
or o
bstr
ucte
d pr
essu
re
tubi
ng.
- D
efec
tive
or m
isw
ired
pres
sure
sw
itche
s -
Exce
ssiv
e w
ind.
If p
robl
em p
ersi
sts
turn
se
tup
switc
h SW
1-3
ON
. -
Plug
ged
cond
ensa
te d
rain
. -
Wat
er in
ven
t pip
ing,
pos
sibl
e sa
ggin
g pi
pe.
33
LIM
IT C
IRCU
IT F
AU
LT –
Indi
cate
s th
e lim
it or
flam
e ro
llout
sw
itch
is o
pen
or th
e fu
rnac
e is
ope
ratin
g in
hig
h-he
at o
nly
mod
e du
e to
2 s
ucce
ssiv
e lo
w- o
r m
ediu
m-h
eat l
imit
trip
s. B
low
er w
ill ru
n fo
r 4
min
. or u
ntil
open
sw
itch
rem
akes
w
hich
ever
is lo
nger
. If
open
long
er th
an 3
m
in.,
code
cha
nges
to lo
ckou
t #13
. If
open
less
than
3 m
in.
sta
tus
code
#33
co
ntin
ues
to fl
ash
until
blo
wer
shu
ts o
ff.
Flam
e ro
llout
sw
itch
requ
ires
man
ual
rese
t. C
heck
for:
-
Prop
er re
ar a
ir ba
ffle.
-
Loos
e bl
ower
whe
el.
- D
efec
tive
switc
h or
con
nect
ions
. -
Impr
oper
low
- or m
ediu
m-h
eat g
as in
put
adju
stm
ent.
- Im
prop
er o
r mis
alig
ned
limit
and/
or li
mit
shie
ld.
- St
uck
high
-hea
t sol
enoi
d in
gas
val
ve.
34
IGN
ITIO
N P
ROVI
NG
FA
ILU
RE –
If fl
ame
is
not s
ense
d du
ring
the
tria
l for
igni
tion
perio
d, th
e co
ntro
l will
repe
at th
e ig
nitio
n se
quen
ce 3
mor
e tim
es b
efor
e lo
ckou
t #14
oc
curs
. If
flam
e si
gnal
is lo
st d
urin
g th
e bl
ower
on-
dela
y pe
riod,
blo
wer
will
com
e on
fo
r the
sel
ecte
d bl
ower
off-
dela
y. C
heck
th
e fo
llow
ing
item
s fir
st b
efor
e pr
ocee
ding
to
the
next
ste
p.
-
Gas
val
ve tu
rned
off.
-
Man
ual s
hut-
off v
alve
. -
Gre
en/Y
ello
w w
ire M
UST
be
conn
ecte
d to
furn
ace
shee
t met
al.
- Fl
ame
sens
or m
ust n
ot b
e gr
ound
ed.
To d
eter
min
e w
heth
er th
e pr
oble
m is
in th
e ga
s va
lve,
igni
ter,
or fl
ame
sens
or th
e sy
stem
can
be
oper
ated
in c
ompo
nent
test
m
ode.
To
chec
k th
e ig
nite
r rem
ove
the
R th
erm
osta
t con
nect
ion
from
the
cont
rol,
rese
t pow
er, a
nd p
ut s
etup
sw
itch
SW1-
6 in
th
e O
N p
ositi
on to
sta
rt th
e co
mpo
nent
test
. D
oes
the
igni
ter g
low
ora
nge/
whi
te b
y th
e en
d of
the
15 s
econ
d w
arm
-up
perio
d?
Unp
lug
igni
ter h
arne
ss fr
om c
ontr
ol a
nd
repe
at c
ompo
nent
test
by
turn
ing
setu
p sw
itch
SW1-
6 O
FF a
nd th
en b
ack
ON
. Ch
eck
for 1
15V
betw
een
pin
3 an
d N
EUTR
AL-
L2 o
n th
e co
ntro
l. W
as 1
15V
pres
ent f
or th
e 15
sec
ond
perio
d?
Chec
k co
nnec
tions
and
retr
y.
If cu
rren
t is
near
typi
cal v
alue
(4
.0-6
.0 n
omin
al) a
nd b
urne
rs
will
not
sta
y on
, rep
eat c
heck
in
hig
h-he
at.
If bu
rner
s w
ill
still
not
sta
y on
repl
ace
cont
rol.
If b
urne
rs o
pera
te in
hi
gh-h
eat t
hen
switc
h to
m
ediu
m-h
eat,
chec
k m
anifo
ld
pres
sure
. If
OK,
che
ck
burn
er c
arry
over
and
flam
e se
nsor
loca
tion.
Clea
n fla
me
sens
or w
ith fi
ne s
teel
woo
l an
d re
chec
k cu
rren
t. N
omin
al c
urre
nt is
4.
0 to
6.0
mic
roam
ps.
Is c
urre
nt n
ear t
ypic
al v
alue
?
Repl
ace
elec
trod
e.
Will
mai
n bu
rner
s ig
nite
and
sta
y on
? Re
plac
e fu
rnac
e co
ntro
l.
Fixe
d.
NO
YES
YES
YES
NO
NO
15
BLO
WER
MO
TOR
LOCK
OU
T –
Indi
cate
s th
e bl
ower
faile
d to
reac
h 25
0 RP
M o
r the
bl
ower
faile
d to
com
mun
icat
e w
ithin
30
seco
nds
afte
r bei
ng tu
rned
ON
in tw
o su
cces
sive
hea
ting
cycl
es.
Cont
rol w
ill
auto
-res
et a
fter
3 h
ours
. Se
e co
de 4
1.
45
CON
TRO
L CI
RCU
ITRY
LO
CKO
UT
Aut
o-re
set
afte
r 1 h
our l
ocko
ut d
ue
to:
- Fl
ame
circ
uit f
ailu
re.
- G
as v
alve
rela
y st
uck
open
.-
Soft
war
e ch
eck
erro
r. Re
set p
ower
to c
lear
lo
ckou
t. R
epla
ce c
ontr
ol
if co
de re
peat
s.
Repl
ace
furn
ace
cont
rol.
Chec
k fo
r con
tinui
ty in
the
harn
ess
and
igni
ter.
Rep
lace
de
fect
ive
com
pone
nt.
Reco
nnec
t the
R th
erm
osta
t lea
d an
d se
t th
erm
osta
t to
call
for h
eat.
Con
nect
vo
ltmet
er a
cros
s ga
s va
lve
conn
ectio
ns.
Doe
s ga
s va
lve
rece
ive
24V?
Doe
s ga
s va
lve
open
and
allo
w g
as to
flo
w?
Do
the
mai
n bu
rner
s ig
nite
?
Do
the
mai
n bu
rner
s st
ay o
n?
Allo
w u
nit t
o dr
op to
low
-hea
t, an
d ch
eck
man
ifold
pre
ssur
e.
Repe
at te
st to
che
ck fo
r in
term
itten
t ope
ratio
n.
Chec
k th
at a
ll ga
s va
lves
are
tu
rned
on.
Rep
lace
val
ve.
Chec
k co
nnec
tions
. If
OK,
re
plac
e co
ntro
l.
Chec
k fo
r: -
Inad
equa
te fl
ame
carr
yove
r or
roug
h ig
nitio
n.
- Lo
w in
let g
as p
ress
ure.
-
Prop
er fi
ring
rate
. -
Air
leak
age
arou
nd ig
nite
r br
acke
t.
Repe
at c
all f
or h
eat a
nd c
heck
flam
e se
nsor
cur
rent
dur
ing
tria
l for
igni
tion
perio
d. I
s th
e D
C m
icro
amps
bel
ow 0
.5?
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
43
LOW
-HEA
T PR
ESSU
RE S
WIT
CH O
PEN
W
HIL
E M
EDIU
M-H
EAT
PRES
SURE
SW
ITCH
IS C
LOSE
D -
Che
ck fo
r: -
Low
-hea
t pre
ssur
e sw
itch
stuc
k op
en.
- D
isco
nnec
ted
or o
bstr
ucte
d pr
essu
re
tubi
ng.
- Im
prop
er p
ress
ure
switc
h w
iring
. -
Low
inle
t gas
pre
ssur
e (if
LG
PS u
sed)
. -
Plug
ged
cond
ensa
te d
rain
. -
Wat
er in
ven
t pip
ing,
pos
sibl
e sa
ggin
g pi
pe.
A07582
58MVC
19
25
INVA
LID
MO
DEL
SEL
ECTI
ON
OR
SETU
P ER
ROR
– If
stat
us c
ode
25 o
nly
flash
es 4
tim
es o
n po
wer
-up
the
cont
rol i
s m
issi
ng it
s m
odel
plu
g PL
4 an
d is
de
faul
ting
to th
e m
odel
sel
ectio
n st
ored
in
mem
ory.
If s
tatu
s co
de 2
5 fla
shes
co
ntin
uous
ly it
cou
ld in
dica
te a
ny o
f the
fo
llow
ing:
- M
odel
plu
g PL
4 is
mis
sing
and
ther
e is
no
val
id m
odel
sto
red
in p
erm
anen
t m
emor
y. T
his
will
hap
pen
if yo
u fo
rget
to
inst
all t
he m
odel
plu
g PL
4 on
a
serv
ice
repl
acem
ent c
ontr
ol.
-
Ther
mos
tat c
all w
ith S
W1-
1 O
N.
-
Ther
mos
tat c
all w
ith S
W1-
6 O
N.
-
SW1-
1 an
d SW
1-6
both
ON
.
- Tw
o di
ffere
nt fu
rnac
e m
odel
s tw
inne
d.
-
Serv
ice
repl
acem
ent c
ontr
ol d
oes
not
reco
gniz
e ne
w m
odel
plu
gs H
K70E
Z017
th
ru H
K70E
Z021
. N
eed
boar
d so
ftw
are
vers
ion
V12
or la
ter.
31
MED
IUM
-HEA
T PR
ESSU
RE S
WIT
CH O
R H
PSR
RELA
Y D
ID N
OT
CLO
SE O
R RE
OPE
NED
- Ch
eck
for:
-
HPS
R re
lay
may
be
defe
ctiv
e.
-
See
stat
us c
ode
32.
41
BLO
WER
MO
TOR
FAU
LT –
Indi
cate
s th
e bl
ower
faile
d to
reac
h 25
0 RP
M o
r the
bl
ower
faile
d to
com
mun
icat
e w
ithin
the
pres
crib
ed ti
me
limits
. Th
irty
seco
nds
afte
r bei
ng tu
rned
ON
or t
en s
econ
ds
durin
g st
eady
-sta
te o
pera
tion.
Tur
n po
wer
off
and
che
ck th
e fo
llow
ing
item
s fir
st
befo
re p
roce
edin
g to
the
next
ste
p.
-
Rubb
ing
blow
er w
heel
.
- Lo
ose
blow
er w
heel
.
- W
iring
from
furn
ace
cont
rol t
o bl
ower
m
otor
.
Rem
ove
the
R th
erm
osta
t con
nect
ion
from
th
e fu
rnac
e co
ntro
l, di
scon
nect
bot
h co
nnec
tors
from
the
blow
er m
otor
PL1
3 an
d PL
14.
Doe
s th
e bl
ower
whe
el tu
rn
free
ly?
Repl
ace
the
blow
er c
ontr
ol m
odul
e at
tach
ed to
th
e bl
ower
mot
or.
Follo
w th
e in
stru
ctio
ns w
ith
the
blow
er c
ontr
ol m
odul
e to
mak
e su
re th
e en
tire
blow
er m
otor
doe
s no
t nee
d to
be
repl
aced
.
Turn
pow
er b
ack
on.
Is th
ere
115V
AC
at
PL14
-5 a
nd P
L14-
4?
You
have
an
open
wire
or b
ad
term
inal
on
eith
er th
e BL
ACK
or
WH
ITE
pow
er le
ads
betw
een
the
furn
ace
cont
rol a
nd th
e bl
ower
mot
or.
If yo
u ha
ve a
po
wer
cho
ke d
isco
nnec
t it a
nd
chec
k co
ntin
uity
.
YES
YES
NO
NO
Is th
ere
12-V
DC
at P
L13-
1 RE
D (+
) and
PL
13-4
GRE
EN (-
)?
YES
NO
Is th
ere
12-V
DC
at P
L3-1
RED
(+) a
nd
PL3-
2 G
REEN
(-)?
Repl
ace
the
furn
ace
cont
rol.
NO
You
have
an
open
wire
or b
ad
term
inal
on
eith
er th
e RE
D o
r G
REEN
wire
bet
wee
n th
e fu
rnac
e co
ntro
l and
the
blow
er
mot
or.
YES
Is th
ere
5-VD
C at
PL1
3-2
YELL
OW
(+)
and
PL13
-4 G
REEN
(-)?
Is th
ere
5-VD
C at
PL3
-3
YELL
OW
(+) a
nd P
L3-2
G
REEN
(-)?
NO
NO
You
have
an
open
wire
or b
ad
term
inal
on
the
YELL
OW
wire
be
twee
n th
e fu
rnac
e co
ntro
l and
th
e bl
ower
mot
or.
YES
YES
The
volta
ge ju
st m
easu
red
shou
ld b
e ve
ry s
tabl
e an
d sh
ould
not
fluc
tuat
e m
ore
than
.02-
VDC.
If t
he v
olta
ge fl
uctu
ates
m
ore
than
this
get
a d
iffer
ent v
oltm
eter
be
fore
pro
ceed
ing.
Turn
pow
er o
ff, d
isco
nnec
t PL1
3 an
d PL
14 fr
om th
e bl
ower
mot
or, t
hen
turn
po
wer
bac
k on
. Co
nnec
t a D
C vo
ltmet
er
acro
ss P
L13-
3 BL
UE
(+) a
nd P
L13-
4 G
REEN
(-).
The
vol
tage
sho
uld
be n
ear
0-VD
C bu
t it w
ill fl
uctu
ate
brie
fly s
ever
al
times
a s
econ
d. I
f you
hav
e an
ana
log
voltm
eter
the
need
le w
ill b
riefly
go
high
se
vera
l tim
es a
sec
ond.
If y
ou h
ave
a di
gita
l vol
tmet
er w
ith a
bar
gra
ph it
will
sh
ow a
larg
e ch
ange
in m
agni
tude
on
the
bar g
raph
sev
eral
tim
es a
sec
ond.
If y
ou
have
a s
tand
ard
digi
tal v
oltm
eter
it w
ill
show
a b
rief fl
uctu
atio
n in
vol
tage
and
the
mag
nitu
de m
ay v
ary
depe
ndin
g on
the
voltm
eter
use
d.
Doe
s th
e vo
ltage
fluc
tuat
e as
des
crib
ed in
the
prev
ious
ste
p?
Conn
ect a
DC
voltm
eter
acr
oss
PL3-
4 BL
UE
(+) a
nd P
L3-2
GRE
EN (-
). D
oes
the
volta
ge
fluct
uate
as
desc
ribed
two
step
s ba
ck?
You
have
an
open
wire
or b
ad te
rmin
al o
n th
e BL
UE
wire
bet
wee
n th
e fu
rnac
e co
ntro
l and
the
blow
er m
otor
.
NO
Repl
ace
the
furn
ace
cont
rol.
YES
Turn
pow
er o
ff, re
conn
ect P
L13
and
PL14
to th
e bl
ower
mot
or, t
hen
turn
po
wer
bac
k on
. Co
nnec
t a D
C vo
ltmet
er
acro
ss P
L3-3
YEL
LOW
(+) a
nd P
L3-2
G
REEN
(-).
Doe
s th
e vo
ltage
fluc
tuat
e m
ore
than
it d
id in
the
prev
ious
ste
p?
NO
YES
YES
NO
Repl
ace
the
blow
er c
ontr
ol m
odul
e at
tach
ed to
th
e bl
ower
mot
or.
Follo
w th
e in
stru
ctio
ns w
ith
the
blow
er c
ontr
ol m
odul
e to
mak
e su
re th
e en
tire
blow
er m
otor
doe
s no
t nee
d to
be
repl
aced
.
42
IND
UCE
R M
OTO
R FA
ULT
– In
dica
tes
the
indu
cer m
otor
has
not
sta
rted
with
in 2
0 se
cond
s af
ter a
cal
l for
hea
t, th
e in
duce
r m
otor
RPM
is o
utsi
de it
s va
lid ra
nge
of
oper
atio
n, o
r the
indu
cer R
PM s
igna
l was
lo
st fo
r 5 s
econ
ds d
urin
g op
erat
ion.
Ch
eck
for:
-
Prop
er v
ent s
izin
g.
-
Faile
d in
duce
r mot
or.
-
Rest
ricte
d co
mbu
stio
n ai
r sup
ply.
- Im
prop
er m
otor
wiri
ng.
A07583
58MVC
20
SERVICE TRAINING
Packaged Service Training programs are an excellent way to increase yourknowledge of the equipment discussed in this manual, including: • Unit Familiarization • Maintenance • Installation Overview • Operating SequenceA large selection of product, theory, and skills programs is available, using popularvideo-based formats and materials. All include video and/or slides, plus companionbook.
Classroom Service Training plus "hands-on" the products in our labs can meanincreased confidence that really pays dividends in faster troubleshooting, fewercallbacks. Course descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-644-5544
[ ] Packaged Service Training [ ] Classroom Service Training
Copyright 2007 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 58MVC---01SMReplaces: New
Printed in U.S.A. Edition Date: 07/07
58MVC