Carrier Furnace 58MXA User Manual

58MXA  
4-Way Multipoise Fixed-Capacity  
Direct-Vent Condensing Gas Furnace  
Service and Maintenance Instructions  
For Sizes 040—140, Series 130  
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A93040  
CANADIAN GAS ASSOCIATION  
A PPROVED  
R
NOTE: Read the entire instruction manual before performing any  
service or maintenance.  
This symbol indicates a change since the last issue.  
Index  
Page  
As an ENERGY STAR®  
Partner, Carrier Corporation  
has determined that this prod-  
uct meets the ENERGY  
STAR® guidelines for energy  
efficiency.  
SAFETY CONSIDERATIONS..................................................1-2  
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........2  
GENERAL......................................................................................2  
CARE AND MAINTENANCE................................................2-11  
Cleaning and/or Replacing Air Filter.......................................3  
Blower Motor and Wheel Maintenance................................3-4  
Cleaning Burners...................................................................4-5  
Cleaning Heat Exchangers ....................................................5-7  
Primary Heat Exchangers ................................................5-7  
Secondary Heat Exchangers................................................7  
Flushing Collector Box and Drainage System ........................7  
Servicing Hot Surface Ignitor...............................................7-8  
Electrical Controls and Wiring.................................................8  
Troubleshooting................................................................8-9-10  
Checking Heat Tape Operation (If Applicable) ....................10  
Winterizing ........................................................................10-11  
WIRING DIAGRAM...................................................................12  
SERVICE LABEL .......................................................................13  
TROUBLESHOOTING GUIDE ............................................14-15  
A93007  
REGISTERED QUALITY SYSTEM  
Fig. 1—Multipoise Furnace in Upflow Orientation  
.2-M95 National Standard of Canada, Natural Gas and Propane  
Installation Codes (NSCNGPIC). Wear safety glasses and work  
gloves. Have a fire extinguisher available during start-up and  
adjustment procedures and service calls.  
Recognize safety information. This is the safety-alert symbol  
.
When you see this symbol on the unit and in instructions or  
manuals, be alert to the potential for personal injury.  
SAFETY CONSIDERATIONS  
Installing and servicing heating equipment can be hazardous due to  
gas and electrical components. Only trained and qualified person-  
nel should install, repair, or service heating equipment.  
Understand the signal words DANGER, WARNING, and CAU-  
TION. These words are used with the safety-alert symbol. DAN-  
GER identifies the most serious hazards which will result in severe  
personal injury or death. WARNING signifies hazards which  
could result in personal injury or death. CAUTION is used to  
identify unsafe practices which would 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.  
Untrained personnel can perform basic maintenance functions  
such as cleaning and replacing air filters. All other operations must  
be performed by trained service personnel. When working on  
heating equipment, observe precautions in the literature, on tags,  
and on labels attached to or shipped with the unit and other safety  
precautions that may apply.  
Follow all safety codes. In the United States, follow all safety  
codes including the National Fuel Gas Code (NFGC) NFPA  
54-1996/ANSI Z223.1-1996 and the Installation Standards, Warm  
Air Heating and Air Conditioning Systems (NFPA 90B)  
ANSI/NFPA 90B. In Canada, refer to the CAN/CGA-B149.1- and  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 6a 8a  
1
4
PC 101  
Catalog No. 535-745  
Printed in U.S.A.  
Form 58MXA-6SM  
Pg 1  
5-99  
Replaces: 58MXA-5SM  
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WASHABLE  
FILTER  
FILTER  
RETAINER  
WASHABLE  
FILTER  
FILTER  
RETAINER  
FILTER  
SUPPORT  
A93046  
A93045  
Fig. 3—Bottom Filter Arrangement  
Fig. 4—Filter Installed for Side Inlet  
Step 1—Cleaning and/or Replacing Air Filter  
All factory wires can be left connected, but field thermostat  
connections may need to be disconnected depending on their  
length and routing.  
The air filter arrangement may vary depending on the application  
or orientation.  
4. Position control box, transformer, and door switch assembly to  
right side of furnace casing.  
5. If condensate trap is located in left- or right-hand side of  
furnace casing, proceed to item 6, otherwise remove trap and  
tubing as described below.  
Never operate unit without a filter or with the blower access  
panel removed. Failure to follow this warning could result in  
a fire or personal injury.  
a. Disconnect field drain connection from condensate trap.  
b. Disconnect drain and relief port tubes from condensate  
trap.  
To clean or replace the filters, proceed as follows:  
1. Turn off electrical supply to furnace.  
c. Remove condensate trap from blower shelf.  
2. Remove main furnace door and blower access panel.  
3. Release filter retainer wire. (See Fig. 3 and 4.)  
4. Slide filter out of furnace.  
6. Remove screws securing blower assembly to blower shelf and  
slide blower assembly out of furnace.  
7. Clean blower wheel and motor by using a vacuum with soft  
brush attachment. Be careful not to disturb balance weights  
(clips) on blower wheel vanes. Do not bend wheel or blades as  
balance will be affected.  
5. Furnaces are equipped with permanent, washable filter(s).  
Clean filter by spraying cold tap water through filter in  
opposite direction of airflow.  
6. Rinse filter and let dry. Oiling or coating of filter is not  
recommended.  
8. If greasy residue is present on blower wheel, remove wheel  
from the blower housing and wash it with an appropriate  
degreaser. To remove wheel:  
7. Place filter in furnace.  
a. Mark blower wheel location on shaft before disassembly to  
ensure proper reassembly.  
8. Replace blower access panel and main furnace door.  
9. Turn on electrical supply to furnace.  
b. Loosen setscrew holding blower wheel on motor shaft.  
NOTE: Mark blower mounting arms and blower housing so each  
arm is positioned at the same hole location during reassembly.  
NOTE: If the filter has cross-mesh binding, the binding must face  
the blower. If the filter has an air direction arrow, the arrow must  
point toward the blower.  
c. Mark blower wheel orientation and cutoff plate location to  
ensure proper reassembly.  
Step 2—Blower Motor and Wheel Maintenance  
d. Remove screws securing cutoff plate and remove cutoff  
plate from housing.  
To ensure long life, economy, and high efficiency, clean accumu-  
lated dirt and grease from blower wheel and motor annually.  
e. Remove bolts holding motor mounts to blower housing and  
slide motor and mounts out of housing. Disconnect capaci-  
tor and ground wire attached to blower housing before  
removing motor.  
The inducer and blower motors are pre-lubricated and require no  
additional lubrication. These motors can be identified by the  
absence of oil ports on each end of the motor.  
The following items should be performed by a qualified service  
technician.  
f. Remove blower wheel from housing.  
g. Clean wheel per instructions on degreaser cleaner.  
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 wires.  
9. Reassemble motor and blower wheel by reversing items 8b  
through 8f. Ensure wheel is positioned for proper rotation. Be  
sure to reattach ground wire.  
10. Reinstall blower assembly in furnace.  
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11. Reinstall condensate trap and tubing if previously removed.  
a. Reinstall condensate trap in hole in blower shelf.  
5. Remove wires from gas valve. Note location for reassembly.  
b. Connect condensate trap drain tubes. See Fig. 8 or tubing  
diagram on main furnace door for proper tube location.  
Label all wires prior to disconnection when servicing con-  
trols. Wiring errors can cause improper and dangerous  
operation.  
(1.) Connect 1 tube (blue or blue and white striped) from  
collector box.  
(2.) Connect 1 tube (violet or unmarked) from inducer  
housing.  
6. Remove burner box pressure tube from gas valve regulator  
fitting.  
(3.) Connect 1 tube (relief port, green or pink) from  
collector box.  
7. Remove screws that secure manifold to burner box. (See Fig.  
5.)  
c. Connect field drain to condensate trap.  
NOTE: Ensure tubes are not kinked or pinched, as this will affect  
operation.  
MANIFOLD  
MOUNTING  
SCREW  
12. Reinstall control box, transformer, and door switch assembly  
on blower shelf.  
13. Reconnect wires.  
Refer to furnace wiring diagram, and connect thermostat leads  
if previously disconnected. (See Fig. 15.)  
NOTE: Refer to Table 1 for motor speed lead relocation if leads  
were not identified before disconnection.  
Table 1—Speed Selector  
FACTORY  
ATTACHED TO  
COLOR  
SPEED  
Black  
High  
Medium High  
Medium Low  
Low  
Cool  
MANIFOLD  
Yellow (When Present)  
Spare  
Blue  
Red  
Heat  
GAS VALVE  
REGULATOR  
FITTING  
Spare  
White  
Common  
Com  
GAS VALVE  
A93295  
Fig. 5—Burner Box Assembly  
Heating speed selection MUST be adjusted to provide proper  
temperature rise as specified on the rating plate. Failure to  
adjust the heating speed may shorten heat exchanger life.  
8. Remove manifold, orifices, and gas valve as 1 assembly.  
9. Remove screws attaching burner assembly in burner box.  
10. Remove burner assembly from burner box.  
14. Turn on electrical supply. Manually close blower access panel  
door switch. Use a piece of tape to hold switch closed. Check  
for proper rotation and speed changes between heating and  
cooling by jumpering R to G and R to Y on control center  
thermostat terminals. (See Fig. 12.)  
NOTE: All burners are attached to burner bracket and can be  
removed as 1 assembly.  
11. Clean burners with soft brush and vacuum.  
12. Reinstall manifold, orifice, and gas valve assembly in burner  
box. Ensure manifold seal grommet is installed properly and  
burners fit over orifices.  
Blower access panel door switch opens 115-v power to  
control center. No component operation can occur. Caution  
must be taken when manually closing this switch for service  
purposes. Failure to follow this warning could result in  
personal injury or death.  
13. Reconnect wires to gas valve. Refer to furnace wiring diagram  
for proper wire location.  
14. Reinstall burner box pressure tube to gas valve regulator  
fitting.  
15. Reinstall gas supply pipe to gas valve using backup wrench on  
gas valve to prevent rotation and improper orientation.  
15. If furnace is operating properly, release blower access panel  
door switch, replace blower access panel, and replace main  
furnace door.  
NOTE: Use propane gas resistant pipe dope to prevent gas leaks.  
DO NOT use Teflon tape.  
Step 3—Cleaning Burners  
The following items should be performed by a qualified service  
technician. If the burners develop an accumulation of light dirt or  
dust, they may be cleaned by using the following procedure:  
Gas valve switch or knob MUST be facing forward or tilted  
upward. Failure to follow this warning could result in  
property damage, personal injury, or death.  
1. Turn off gas and electrical supplies to furnace.  
2. Remove main furnace door.  
16. Replace burner box cover.  
3. Remove burner box cover.  
17. Turn on gas and electrical supplies to furnace.  
18. Check for gas leaks.  
4. Using backup wrench, disconnect gas supply pipe from gas  
valve.  
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PRIMARY HX  
INLET OPENINGS  
Never use matches, candles, flame, or other sources of  
ignition to check for gas leakage. Use a soap-and-water  
solution. Failure to follow this warning could result in a fire,  
personal injury, or death.  
19. Replace main furnace door.  
Step 4—Cleaning Heat Exchangers  
The following items should be performed by a qualified service  
technician.  
PRIMARY HEAT EXCHANGERS  
If the heat exchangers get an accumulation of light dirt or dust on  
the inside, they may be cleaned by the following procedure:  
NOTE: If the heat exchangers get a heavy accumulation of soot  
and carbon, both the primary and secondary heat exchangers  
should be replaced rather than trying to clean them thoroughly due  
to their intricate design. A build-up of soot and carbon indicates  
that a problem exists which needs to be corrected, such as  
improper adjustment of manifold pressure, insufficient or poor  
quality combustion air, improper vent termination, incorrect size  
or damaged manifold orifice(s), improper gas, or a restricted heat  
exchanger (primary or secondary). Action must be taken to correct  
the problem.  
A93080  
Fig. 6—Cleaning Inlet Openings of Primary Heat  
Exchangers  
NOTE: Inspect combustion-air intake housing. If foamed gasket  
was removed, check for any damage. If gasket is damaged in any  
way, it must be repaired. To repair, remove damaged gasket  
section, apply sealant releasing agent such as PAM cooking spray  
or equivalent (must not contain corn or canola oil, aromatic or  
halogenated hydrocarbons or inadequate seal may occur) to burner  
box and apply a small bead of G.E. RTV 162. G.E. RTV 6702, or  
Dow-Corning RTV 738 sealant to edge of combustion-air intake  
housing. (See Fig. 7.)  
1. Turn off gas and electrical supplies to furnace.  
2. Remove main furnace door.  
3. Disconnect wires or connectors to rollout switch, gas valve,  
ignitor, and flame sensor.  
Label all wires prior to disconnection when servicing con-  
trols. Wiring errors can cause improper and dangerous  
operation.  
4. Disconnect combustion-air intake pipe from intake housing.  
5. Remove the pressure switch tube from intake housing.  
RTV  
6. Remove screws attaching intake housing to burner box, and  
rotate intake housing away from burner box for removal.  
7. Using backup wrench, disconnect gas supply pipe from gas  
valve.  
PAM  
8. Disconnect pressure tubing from gas valve.  
9. Remove 2 screws attaching top filler panel and rotate upwards  
to gain access to screws attaching burner box to cell panel.  
A93087  
Fig. 7—Combustion-Air Intake Housing Gasket  
Repair  
10. Remove screws attaching burner box to cell panel. (See Fig.  
5.)  
NOTE: Burner box cover, manifold, gas valve, and burner  
assembly should be removed as 1 assembly.  
13. Refer to furnace wiring diagram and reconnect wires to rollout  
switch, gas valve, ignitor, and flame sensor.  
14. Reconnect pressure switch tubes to gas valve and intake  
housing. Refer to tube routing label on main furnace door for  
proper tube location. Be sure tubes are not kinked. (See Fig.  
8.)  
11. Clean heat exchanger openings with a vacuum and a soft  
brush. (See Fig. 6.)  
NOTE: After cleaning, inspect the heat exchangers to ensure they  
are free of all foreign objects that may restrict flow of combustion  
products.  
15. Turn on gas and electrical supplies to furnace.  
16. Check furnace operation through 2 complete heat operating  
cycles. Look through sight glass in burner enclosure to check  
burners. Burner flames should be clear blue, almost transpar-  
ent. (See Fig. 9.)  
12. Reverse items 4 through 10 for reassembly.  
17. Check for gas leaks.  
The ground wire from the gas valve MUST be attached to the  
burner box attachment screw. Failure to attach this ground  
wire to an adequate casing ground will cause the furnace  
control to lock out.  
NOTE: Be sure burner box gasket is installed between burner box  
and cell panel. If gasket is damaged, replace it.  
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TUBE ROUTING  
Furnace is shipped from factory in upflow configuration. Pressure tube and drain tube routing MUST match the diagrams below.  
Condensate Trap on LEFT  
Condensate Trap; Factory Installed  
Tube location when used in UPFLOW application  
Side Optional  
in Blower Shelf  
BURNER ENCLOSURE  
PRESSURE REFERENCE  
TUBE ASSEMBLY  
BURNER ENCLOSURE  
PRESSURE REFERENCE  
TUBE ASSEMBLY  
(Blower access panel removed)  
CAP  
CAP  
COLLECTOR BOX TUBE  
(PINK)  
PLUG  
PLUG  
COLLECTOR BOX TUBE  
COLLECTOR BOX TUBE  
(GREEN)  
(PINK)  
COLLECTOR BOX DRAIN  
TUBE  
COLLECTOR BOX TUBE (GREEN)  
(BLUE & WHITE STRIPED)  
COLLECTOR BOX DRAIN TUBE  
(BLUE & WHITE STRIPED)  
INDUCER HOUSING (MOLDED) DRAIN TUBE  
(BEHIND COLLECTOR BOX DRAIN TUBE)  
CONDENSATE TRAP  
COLLECTOR BOX DRAIN TUBE  
(BLUE)  
COLLECTOR BOX DRAIN TUBE  
(BLUE)  
FIELD-INSTALLED  
FACTORY-SUPPLIED  
DRAIN TUBE COUPLING  
(RIGHT DRAIN OPTION)  
CONDENSATE TRAP  
FIELD-INSTALLED  
FACTORY-SUPPLIED DRAIN TUBE  
COUPLING (LEFT DRAIN OPTION)  
INDUCER HOUSING DRAIN TUBE  
(VIOLET)  
FIELD-INSTALLED  
FACTORY-SUPPLIED 1/2-IN.  
CPVC STREET ELBOWS (2)  
FOR LEFT DRAIN OPTION  
FIELD-INSTALLED FACTORY-SUPPLIED  
DRAIN TUBE  
Condensate Trap on  
LEFT Side  
Condensate Trap on  
RIGHT Side  
Tube location when used in DOWNFLOW application  
PLUG  
COLLECTOR BOX  
DRAIN TUBE (BLUE)  
PLUGGED END  
CAP  
CAP  
COLLECTOR BOX DRAIN TUBE  
(BLUE)  
COLLECTOR BOX DRAIN  
TUBE  
(BLUE & WHITE STRIPED)  
COLLECTOR BOX  
TUBE (GREEN)  
COLLECTOR BOX TUBE  
(PINK)  
PLUG  
COLLECTOR BOX DRAIN TUBE  
(BLUE & WHITE STRIPED)  
COLLECTOR BOX TUBE  
(GREEN)  
INDUCER HOUSING DRAIN  
TUBE (VIOLET)  
COLLECTOR BOX  
EXTENSION TUBE  
COLLECTOR BOX EXTENSION TUBE  
BURNER ENCLOSURE PRESSURE  
REFERENCE TUBE ASSEMBLY  
COLLECTOR BOX  
EXTENSION TUBE  
CONDENSATE TRAP  
DRAIN TUBE COUPLING  
CONDENSATE TRAP  
COLLECTOR BOX  
TUBE (PINK)  
BURNER ENCLOSURE PRESSURE  
REFERENCE TUBE ASSEMBLY  
DRAIN TUBES ROUTED IN  
FRONT OF GAS VALVE  
COLLECTOR BOX  
EXTENSION DRAIN TUBE  
GAS VALVE  
INDUCER HOUSING DRAIN TUBE (VIOLET)  
Tube location when used on  
HORIZONTAL - LEFT application  
Tube location when used on  
HORIZONTAL - RIGHT application  
AUXILIARY "J" BOX RELOCATED HERE  
COLLECTOR BOX DRAIN TUBE  
(BLUE)  
COLLECTOR BOX DRAIN TUBE  
(BLUE & WHITE STRIPED)  
COLLECTOR BOX EXTENSION TUBE  
COLLECTOR BOX TUBE (PINK)  
PLUG  
CAP  
PLUG  
COLLECTOR BOX  
TUBE (GREEN)  
BURNER ENCLOSURE  
PRESSURE REFERENCE  
TUBE ASSEMBLY  
INDUCER HOUSING  
DRAIN TUBE  
(VIOLET)  
CAP  
COLLECTOR BOX  
EXTENSION TUBE  
BURNER ENCLOSURE  
PRESSURE REFERENCE  
TUBE ASSEMBLY  
COLLECTOR BOX  
DRAIN TUBE (BLUE)  
CONDENSATE TRAP  
COLLECTOR BOX  
EXTENSION TUBE  
COLLECTOR BOX  
TUBE (GREEN)  
DRAIN TUBE  
COUPLING  
COLLECTOR BOX TUBE (PINK)  
RELOCATE TUBE BETWEEN BLOWER  
SHELF AND INDUCER HOUSING FOR  
040,060, AND 080 HEATING INPUT  
FURNACES  
COLLECTOR BOX EXTENSION DRAIN TUBE  
COLLECTOR BOX DRAIN TUBE  
(BLUE AND WHITE STRIPED)  
CONDENSATE TRAP  
INDUCER HOUSING DRAIN TUBE (VIOLET)  
NOTE:  
1. All tubing must be connected securely and routed to avoid kinks and traps.  
2. Pressure tubing must always slope away from pressure switch to collector box connection as shown.  
3. HORIZONTAL-LEFT installations require the collector box pressure tube to be relocated between the inducer housing and the blower shelf to  
prevent a trap. Refer to the Installation Instructions for further details.  
324999-201 REV. A  
(LIT. BOTTOM)  
A99102  
Fig. 8—Furnace Pressure and Drain Tubing Diagram  
BURNER FLAME  
BURNER  
Never use matches, candles, flame, or other sources of  
ignition to check for gas leakage. Use a soap-and-water  
solution. Failure to follow this warning could result in a fire,  
personal injury, or death.  
18. Replace main furnace door.  
SECONDARY HEAT EXCHANGERS  
NOTE: The condensing side (inside) of the secondary heat  
exchangers CANNOT be serviced or inspected. A small number of  
bottom outlet openings can be inspected by removing the inducer  
assembly. See Flushing Collector Box and Drainage System  
section for details on removing inducer assembly.  
Step 5—Flushing Collector Box and Drainage  
System  
MANIFOLD  
A89020  
1. Turn off gas and electrical supplies to furnace.  
2. Remove main furnace door.  
Fig. 9—Burner Flame  
3. Disconnect inducer motor and pressure switch wires or  
connectors.  
6
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4. Disconnect pressure switch tubes.  
14. Check furnace operation through 2 complete heat operating  
cycles. Check area below inducer housing, vent pipe, and  
condensate trap to ensure no condensate leaks occur. If leaks  
are found, correct the problem.  
5. Disconnect vent pipe from inducer housing outlet by loosen-  
ing coupling clamp on inducer outlet.  
6. Disconnect drain tube from inducer housing. (See Fig. 8.)  
15. Check for gas leaks.  
7. Remove inducer housing assembly by removing 4 bolts  
attaching assembly to cell panel.  
8. Flush inside of collector box with water until discharge from  
condensate trap is clean and runs freely.  
Never use matches, candles, flame, or other sources of  
ignition to check for gas leakage. Use a soap-and-water  
solution. Failure to follow this warning could result in a fire,  
personal injury, or death.  
NOTE: Ensure the drain tube disconnected from the inducer  
housing is higher than the collector box opening or water will flow  
out tube.  
16. Replace main furnace door.  
9. Inspect inside area of collector box for any pieces of foreign  
materials and remove if present.  
Step 6—Servicing Hot Surface Ignitor  
The ignitor does NOT require annual inspection. Check ignitor  
resistance before removal.  
DO NOT use wire brush or other sharp object to inspect or  
dislodge materials in secondary heat exchangers as failure of  
the secondary heat exchanger will occur. Flush with water  
only.  
1. Turn off gas and electrical supplies to furnace.  
2. Remove main furnace door.  
3. Disconnect ignitor wire connection.  
4. Check ignitor resistance.  
10. Reassemble inducer assembly by reversing items 5 through 7.  
Tighten the vent coupling clamp screw(s) to 15 in.-lb. of  
torque.  
a. Using an ohm meter, check resistance across both ignitor  
leads in connector.  
b. Cold reading should be between 45 ohms and 90 ohms.  
NOTE: If seal between the inducer housing and the collector box  
is damaged in any way, it must be repaired. To repair, apply  
sealant releasing agent such as PAM cooking spray or equivalent  
(must not contain corn or canola oil, aromatic or halogenated  
hydrocarbons or inadequate seal may occur) to inducer housing.  
(See Fig. 10.) Apply a small bead of G.E. RTV 162, G.E. RTV  
6702, or Dow-Corning RTV 738 sealant to groove in collector  
box.  
c. If ohm reading is higher than 110 ohms, ignitor is cracked  
and must be replaced.  
5. Remove ignitor assembly.  
Allow ignitor to cool before removal. Normal operation  
temperatures exceed 2000°F.  
a. Do not remove ignitor from bracket while assembly is in  
furnace. Using a 1/4 in. nutdriver, remove screw securing  
bracket and ignitor assembly to bottom of burner box. The  
screw in the bracket is always located toward outside of  
burner box. The screw may be hidden by inlet box or inlet  
pipe, but can be removed without removing either. After  
removing screw, slide ignitor and bracket toward outside of  
burner box and pull straight out.  
PAM  
RTV  
The ignitor is fragile. DO NOT allow it to hit the side of the  
burner box opening while removing or replacing it.  
b. Inspect ignitor for a white area indicating a crack may be  
present. If found, replace ignitor.  
NOTE: A small crack cannot be seen on a new ignitor. After a  
period of operation, a white area will be visible around the crack.  
c. If replacement is required, replace ignitor on ignitor bracket  
external to furnace to avoid damage as the silicon portion is  
very brittle and will easily crack or shatter.  
d. To remove ignitor from ignitor bracket, remove screw  
holding ignitor ceramic block to bracket and pull ceramic  
block out of bracket.  
A93081  
Fig. 10—Gasket on Collector Box  
6. To replace ignitor/ignitor assembly, reverse items 5a through  
5d.  
11. Refer to furnace wiring diagram and reconnect wires to  
inducer motor and pressure switch or connectors.  
7. Reconnect ignitor wire connection.  
12. Reconnect pressure tubes to pressure switch. See diagram on  
main furnace door for proper location of tubes. Be sure tubes  
are not kinked. (See Fig. 8.)  
8. Turn on gas and electrical supplies to furnace.  
9. Verify ignitor operation by initiating control board self-test  
feature or by cycling thermostat.  
13. Turn on gas and electrical supplies to furnace.  
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10. Replace main furnace door.  
The control center stores 1 status code (representing the last fault  
to occur) for a period of 48 hr or until the 115- or 24-v power is  
interrupted.  
Step 7—Electrical Controls and Wiring  
NOTE: Removing blower access panel will open blower access  
panel door switch and terminate 115-v power to control center.  
The status code will be erased. Look into blower access panel sight  
glass for current LED status BEFORE removing blower access  
panel.  
There may be more than 1 electrical supply to the unit. Check  
accessories and cooling unit for additional electrical supplies.  
The electrical ground and polarity for 115-v wiring must be  
maintained properly. Refer to Fig. 11 for field wiring information  
and to Fig. 15 for unit wiring information.  
The unit’s component test is a useful troubleshooting tool since it  
displays the current status code of the furnace and functionally  
operates all furnace components except the gas valve. The com-  
ponent test and methods to initiate it are described below.  
NOTE: If the polarity is not correct, the STATUS LED on the  
control center will flash rapidly and prevent the furnace from  
operating. The control system also requires an earth ground for  
proper operation of the control center and flame sensing.  
COMPONENT TEST SEQUENCE  
NOTE: All components are functionally operated except the gas  
valve.  
The 24-v circuit contains an automotive-type, 3-amp fuse located  
on the control center. (See Fig. 12.) Any direct shorts of the 24-v  
wiring during installation, service, or maintenance will cause this  
fuse to blow. If fuse replacement is required, use ONLY a fuse of  
identical size.  
When component test is initiated, the following sequence of events  
occurs:  
1. LED flashes a status code 4 times.  
2. Inducer motor starts and continues to run for remainder of  
component test.  
With power to the unit disconnected, check all electrical connec-  
tions for tightness. Tighten all screws on electrical connections. If  
any smoky or burned connections are found, disassemble the  
connection, clean all parts, strip wire, and reassemble properly and  
securely.  
3. Hot surface ignitor is energized for 15 sec, then de-energized.  
4. Main blower operates at cooling speed for 10 sec, then turns  
off.  
5. Main blower operates at heating speed for 10 sec, then turns  
off.  
Reconnect electrical supply to unit and observe unit through 1  
complete operating cycle. Electrical controls are difficult to check  
without proper instrumentation; if there are any discrepancies in  
the operating cycle, contact your dealer and request service.  
6. Inducer motor stops.  
Component test can be initiated by one of the following proce-  
dures.  
INITIATING COMPONENT TEST AND RETRIEVING STA-  
TUS CODE BY REMOVING MAIN LIMIT SWITCH WIRE  
Step 8—Troubleshooting  
For an explanation of status codes, refer to service label located on  
back of main furnace door or Fig. 16, and the Troubleshooting  
Guide.  
NOTE: NO thermostat signal may be present at control center  
and all blower time delay off periods must be completed.  
FIELD 24-V WIRING  
FIELD 115-, 208/230-, 460-V WIRING  
FACTORY 24-V WIRING  
FACTORY 115-, 208/230-, 460-V WIRING  
NOTE 5  
THERMOSTAT  
TERMINALS  
W
C
R
G
Y
FIVE  
WIRE  
FIELD-SUPPLIED  
DISCONNECT  
THREE-WIRE  
HEATING  
ONLY  
208/230- OR  
460-V  
THREE PHASE  
W/W1  
GND  
GND  
GND  
115-V  
SINGLE  
PHASE  
NOTE  
3
W2  
R
208/230-V  
SINGLE  
PHASE  
G
C
AUXILIARY  
J-BOX  
115-V  
FIELD-SUPPLIED  
DISCONNECT  
SWITCH  
GND  
NOTE 1  
CONDENSING  
UNIT  
Y/Y2  
TWO WIRE  
NOTES:  
24-V  
TERMINAL  
BLOCK  
FURNACE  
CONTROL  
CENTER  
1. Connect Y or Y/Y2 terminal as shown for proper cooling operation.  
2. Proper polarity must be maintained for 115-v wiring.  
3. Use W2 with 2-stage thermostat when zoning.  
4. If any of the original wire, as supplied, must be replaced, use  
same type or equivalent wire.  
5. Some thermostats require a "C" terminal connection as shown.  
A98325  
Fig. 11—Field Wiring  
8
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BLOWER OFF DELAY  
ADJUSTMENT SWITCH  
24V THERMOSTAT  
TERMINALS  
G
R
Y
W
Com  
24V  
TEST/TWIN  
HUMIDIFIER TERMINAL  
(24-VAC 0.5 AMP MAX)  
HUM  
LED OPERATION &  
STATUS LIGHT  
HARNESS CONNECTOR  
SEC-1  
24V TRANSFORMER SEC-2  
SPARE 1  
3-AMP FUSE  
COOL  
HEAT  
BLOWER SPEED  
SELECTION TERMINALS  
SPARE 2  
EAC 1 (BLACK)  
EAC-ELECTRONIC AIR CLEANER  
TERMINALS (115-VAC 1.5 AMP MAX)  
115-VAC (L1)  
POWER  
EAC 2 (WHITE)  
115-VAC (L2) NEUTRAL  
CONNECTION  
SUPPLY  
HOT SURFACE  
INDUCER MOTOR  
CONNECTOR  
IGNITOR  
CONNECTOR  
A93052  
Fig. 12—Control Center  
1. Leave 115-v power to furnace turned on.  
2. Remove main furnace door.  
3. Manually close blower access panel door switch. Use a piece  
of tape to hold switch closed.  
3. Look into blower access panel sight glass for current LED  
status.  
NOTE: Leave blower access panel installed to maintain power to  
control center to view current LED status.  
Blower access panel door switch opens 115-v power to  
control center. No component operation can occur. Caution  
must be taken when manually closing this switch for service  
purposes. Failure to follow this warning could result in  
electrical shock, personal injury, or death.  
4. BRIEFLY remove either wire from the main limit switch until  
the LED goes out, then reconnect it.  
4. BRIEFLY short (jumper) TEST, 1/4-in. quick-connect termi-  
nal on control center (adjacent to the LED diagnostic light)  
and the COM terminal on thermostat connection block. (See  
Fig. 12.)  
Make sure limit switch wire does not contact any metallic  
component such as the gas valve. If wire is shorted, 3-amp  
fuse on control center will blow.  
NOTE: If TEST to COM terminals are jumpered longer than 2 sec,  
LED will flash rapidly, and retrieval request will be ignored.  
NOTE: If wire to main limit is disconnected longer than 4 sec, the  
control senses limit circuit is open. Main blower will start and  
retrieval request will be ignored.  
5. When above items have been completed, the component test  
sequence will occur as described in the Component Test  
Sequence section above.  
5. When above items have been completed, the component test  
sequence will occur as described in the Component Test  
Sequence section above.  
NOTE: Be sure to record the status code which is flashed 4 times  
at start of component test for further troubleshooting.  
NOTE: Be sure to record the status code which is flashed 4 times  
at start of component test for further troubleshooting.  
6. After component test is completed and furnace is operating  
properly, release blower access panel door switch, replace  
blower access panel, and replace main furnace door.  
6. After component test is completed and LED is ON continu-  
ously indicating the furnace is ready to operate when a signal  
from the thermostat is received, replace main furnace door.  
Step 9—Checking Heat Tape Operation (If Applicable)  
INITIATING COMPONENT TEST AND RETRIEVING STA-  
TUS CODE BY JUMPERING CONTROL TEST TERMINAL  
In applications where the ambient temperature around the furnace  
is 32°F or lower, freeze protection measures are required. If this  
application is where heat tape has been applied, check to ensure it  
will operate when low temperatures are present.  
1. Remove main furnace door.  
2. Remove blower access panel.  
9
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1. Check for signs of physical damage to heat tape such as nicks,  
cuts, abrasions, gnawing by animals, etc.  
2. Check for discolored heat tape insulation. If any damage or  
discolored insulation is evident, replace heat tape.  
3. Check that heat tape power supply circuit is on.  
Step 10—Winterizing  
32°F MINIMUM INSTALLED  
AMBIENT OR FREEZE  
PROTECTION REQUIRED  
Freezing condensate left in the furnace will damage the  
equipment.  
If the furnace will be off for an extended period of time in a  
structure where the temperature will drop to 32°F or below,  
winterize as follows:  
1. Turn off electrical supply to furnace.  
2. Remove main furnace door.  
3. Disconnect drain tube from inducer housing. (See Fig. 13.)  
A93058  
4. Insert funnel in drain tube and pour antifreeze, propylene  
glycol (RV, swimming pool antifreeze, or equivalent) into  
furnace until it is visible at point where condensate enters open  
drain. (See Fig. 14.)  
If this furnace is installed in an unconditioned space where  
the ambient temperatures may be 32°F or lower, freeze  
protection measures must be taken.  
5. Reconnect drain tube to inducer housing.  
6. Replace main furnace door.  
Do not use ethylene glycol (Prestone II antifreeze/coolant or  
equivalent automotive type). Failure of plastic components  
will occur.  
NOTE: Heat tape, when used, should be wrapped around the  
condensate drain trap and drain line. There is no need to use heat  
tape within the furnace casing. Most heat tapes are temperature  
activated, and it is not practical to verify the actual heating of the  
tape. Check the following:  
4
A99118  
A99119  
Fig. 13—Inducer Housing Drain Tube  
Fig. 14—Funnel in Drain and Antifreeze Running  
Through Trap  
10  
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TO 115VAC FIELD DISCONNECT  
SCHEMATIC DIAGRAM  
(WHEN USED)  
LGPS  
SW2  
SW1  
G
R
NOTE #4  
NEUTRAL  
PRS  
BLOWER  
OFF  
(NATURAL GAS & PROPANE)  
PCB  
L1  
SEE NOTE #10  
Y
GND  
EQUIPMENT GROUND  
ORN  
DELAY  
W
COM  
HUM  
(NOT ON ALL MODELS)  
L2  
LO  
ILK  
BLOWER OFF DELAY  
SELECTION CHART  
SPARE-2  
HEAT  
MED LO  
MED HI  
HI  
TEST/TWIN  
NOTE #6  
YEL  
L1  
LED  
90 SEC  
135 SEC  
180 SEC  
225 SEC  
BLU  
1-M  
START  
SPARE-1  
OL  
HI/LO  
EAC-2  
NOTE #8  
BLWR  
RED  
LS  
3-P  
GV  
2-C  
NOTE #5  
COOL  
COM  
RED  
CAP-1  
IDM  
COM  
PL1  
WHT  
3
2
1
FRS  
FSE  
BLWM  
EAC-1  
WHT  
4
7
6
9
5
8
HSIR  
IDR  
RED  
GRN  
BLK  
WHT  
1
2
1
HSI  
GVR  
SEC-1  
SEC-2  
BLU  
RED  
OL  
2
PL5  
PR2  
PL2  
M
AUX  
HI/LO  
RELAY  
1
3
1
3
WHT (COM)  
GRN  
PR1  
TRAN  
115VAC  
24VAC  
24 VAC-3A  
FUSE  
BRN  
BRN  
PL4  
FU1  
BLK (HI)  
BRN  
PL3  
CAP -2  
OL  
COOL  
BLOWER  
SPARE-1  
YEL (MED HI)  
NOTE #8  
HSIR IDR BLWR  
2
2
SPEED  
SELECT  
START  
BLWM  
CAP -1  
TEST/TWIN  
NOTE #7  
FU1  
HEAT SPARE-2  
EAC-1  
BLU (MED LO)  
RED (LO)  
FRS  
LS  
SEC-2  
L2  
BRN  
SEC-1  
PL3  
NOTE #12  
PL2  
GVR-2  
1
2
7
1
VAC  
PR1  
HUM  
120  
L1  
1
2
EAC-2  
COM  
3
PR2  
R
WHT (COM)  
(WHEN USED)  
LGPS  
WHT  
BLK  
W
4
CAP -2  
2
3
PL4  
HSIR  
BLWR  
HI/LO  
1
NOTE #6  
PRS  
FUSED DISCONNECT  
PL1  
IDR  
GVR  
SWITCH (WHEN REQ'D)  
PL5  
BRN  
BRN  
IDM  
JB  
NOTE #4  
1
2
WHT  
M
WHT  
NEUTRAL  
L1  
ILK  
3
2
GRN  
BLK  
AUX  
OL  
3-P  
GV  
BLK  
GVR-1  
FU2  
HSI  
GRN  
GND  
CPU  
2-C  
GRN  
1-M  
Y
8
NOTE #5  
LEGEND  
PL1  
9-CIRCUIT CONNECTOR  
2-CIRCUIT PCB CONNECTOR  
3-CIRCUIT IDM CONNECTOR  
3-CIRCUIT IDM EXTENSION CONNECTOR  
2-CIRCUIT HSI/PCB CONNECTOR  
PRESSURE SWITCH, SPST-(N.O.)  
BLOWER OFF DELAY  
COMPONENT TEST & TWIN TERMINAL  
TRANSFORMER-115VAC/24VAC  
G
5
6
PL2  
PL3  
PL4  
PL5  
PRS  
SW1 & 2  
TEST/TWIN  
TRAN  
FSE  
BLWR BLOWER MOTOR RELAY, SPST-(N.O.)  
BLWM BLOWER MOTOR  
CAP  
CPU  
CAPACITOR  
MICROPROCESSOR AND CIRCUITRY  
COM  
EAC-1 ELECTRONIC AIR CLEANER CONNECTION (115 VAC 1.5 AMP MAX.)  
EAC-2 ELECTRONIC AIR CLEANER CONNECTION (COMMON)  
9
NOTES:  
FRS  
FSE  
FU1  
FU2  
FLAME ROLLOUT SW. -MANUAL RESET, SPST-(N.C.)  
FLAME PROVING ELECTRODE  
FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED  
FUSE OR CIRCUIT BREAKER CURRENT INTERRUPT DEVICE  
(FIELD INSTALLED & SUPPLIED)  
1. IF ANY OF THE ORIGINAL EQUIPMENT WIRE IS REPLACED USE WIRE RATED FOR 105˚C.  
2. INDUCER (IDM) AND BLOWER (BLWM) MOTORS CONTAIN INTERNAL  
AUTO-RESET THERMAL OVERLOAD SWITCHES (OL).  
3. BLOWER MOTOR SPEED SELECTIONS ARE FOR AVERAGE CONDITIONS, SEE INSTALLATION  
INSTRUCTIONS FOR DETAILS ON OPTIMUM SPEED SELECTION.  
4. USE ONLY COPPER WIRE BETWEEN THE DISCONNECT SWITCH AND THE  
FURNACE JUNCTION BOX (JB).  
JUNCTION  
UNMARKED TERMINAL  
PCB TERMINAL  
GND  
GV  
GVR  
EQUIPMENT GROUND  
GAS VALVE-REDUNDANT OPERATORS  
GAS VALVE RELAY, DPST-(N.O.)  
FACTORY WIRING (115VAC)  
FACTORY WIRING (24VAC)  
FIELD WIRING (115VAC)  
FIELD WIRING (24VAC)  
CONDUCTOR ON PCB  
FIELD WIRING TERMINAL  
FIELD EARTH GROUND  
EQUIPMENT GROUND  
FIELD SPLICE  
HI/LO BLOWER MOTOR SPEED CHANGE RELAY, SPDT  
HSI HOT SURFACE IGNITOR (115 VAC)  
HSIR HOT SURFACE IGNITOR RELAY, SPST-(N.O.)  
HUM 24VAC HUMIDIFIER CONNECTION (.5 AMP. MAX.)  
5. THIS WIRE MUST BE CONNECTED TO FURNACE SHEETMETAL FOR CONTROL TO PROVE  
FLAME.  
6. FACTORY CONNECTED WHEN LGPS NOT USED.  
7. REPLACE ONLY WITH A 3 AMP FUSE.  
IDM  
IDR  
ILK  
JB  
INDUCED DRAFT MOTOR  
8. YELLOW LEAD NOT ON ALL MOTORS.  
INDUCED DRAFT RELAY, SPST-(N.O.)  
BLOWER ACCESS PANEL INTERLOCK SWITCH, SPST-(N.O.)  
JUNCTION BOX  
9. BLOWER-ON DELAY, GAS HEATING 60 SECONDS, COOLING OR HEAT PUMP 2 SECONDS.  
10. BLOWER-OFF DELAY, GAS HEATING 90, 135, 180 OR 225 SECONDS, COOLING OR  
HEAT PUMP 90 SECONDS. (135 SECONDS ONLY ON SOME MODELS)  
11. IGNITION-LOCKOUT WILL OCCUR AFTER FOUR CONSECUTIVE UNSUCCESSFUL  
TRIALS-FOR-IGNITION. CONTROL WILL AUTO-RESET AFTER THREE HOURS.  
12. SOME MODELS MAY HAVE SPADE QUICK CONNECT TERMINALS.  
LED  
LIGHT-EMITTING DIODE FOR STATUS CODES  
LGPS LOW GAS PRESSURE SWITCH, SPST-(N.O.)  
LS  
OL  
PCB  
LIMIT SWITCH, AUTO RESET, SPST(N.C.)  
AUTO-RESET INTERNAL MOTOR OVERLOAD TEMP. SW.  
PRINTED CIRCUIT BOARD  
PLUG RECEPTACLE  
322854-101 REV. D (LIT)  
A99106  
Fig. 15—Wiring Diagram  
11  
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SERVICE  
If status code recall is needed, do not remove power or blower door. Briefly remove and then  
reconnect one main limit wire to display stored status code.  
LED CODE  
STATUS  
CONTINUO US OFF - C he c k for 115VAC a t L1 a nd L2, a nd 24VAC a t SEC -1 a nd  
SEC-2.  
CONTINUO US ON -  
RAPID FLASHING -  
C ontro l ha s 24V p o we r.  
Line vo lta g e (115V) p o la rity re ve rse d . If twinne d , re fe r to  
twinning kit instruc tio ns.  
EACH OF THE FOLLOWING STATUS CODES IS A TWO DIGIT NUMBER WITH THE FIRST  
DIGIT DETERMINED BY THE NUMBER OF SHORT FLASHES AND THE SECOND DIGIT BY  
THE NUMBER OF LONG FLASHES.  
11 NO PREVIOUS CODE - Sto re d sta tus c od e s a re e ra se d w he n p o we r  
(115V or 24V) to c o ntro l is inte rrup te d o r 48 ho urs a fte r e a c h fa ult is c le a re d .  
12 BLOWER ON AFTER PO WER UP (115V o r 24V) - Blowe r runs for 90 se c on d s,  
if unit is p ow e re d up d uring a c a ll fo r he a t (R-W c lo se d ).  
13 LIMIT OR FLAME RO LL-OUT SWITCH LOCKOUT - Co ntrol will a uto re se t a fte r  
thre e ho urs unle ss fla m e ro ll-o ut switc h o r fuse link is o p e ne d , re fe r to #33.  
14 IG NITIO N LO CKO UT - C o ntro l will a uto -re se t a fte r thre e ho urs. Re fe r to #34.  
21 G AS HEATING LOCKOUT - C ontro l will NO T a uto re se t.  
C he c k fo r: - Mis-wire d g a s va lve  
-De fe c tive c o ntro l (va lve re la y)  
22 ABNORMAL FLAME-PROVING SIGNAL - Fla m e is p ro ve d while g a s va lve is  
d e -e ne rg ize d . Ind uc e r will run until fa ult is c le a re d .  
C he c k fo r:  
- Le a ky g a s va lve  
-Stuc k-op e n g a s va lve  
23 PRESSURE SWITCH (ES) DID NO T OPEN C he c k fo r:  
- Ob struc te d p re ssure tub ing .  
24 SECONDARY VO LTAGE FUSE IS OPEN  
- De fe c tive p re ssure switc h (stuc k c lose d ).  
C he c k fo r: - Short c irc uit in se c o nd a ry vo lta g e (24V) wiring .  
31 PRESSURE, DRAFT SAFEG UARD, AUXILIARY-LIMIT (whe n use d ) , O R BLOCKED  
VENT SHUTO FF (whe n use d ) SWITCH DID NOT CLOSE O R REOPENED - If o p e n  
long e r tha n five m inute s, ind uc e r shuts o ff fo r 15 m inute s b e fo re re try.  
C he c k fo r:  
- Ina d e q ua te C o m b ustio n a ir sup p ly.  
- Pro p e r ve nt sizing a nd c ond e nsa te p itc h o r sa g  
- Lo w ind uc e r volta g e .  
- Ve nt re stric tion or hig h wind s.  
- Disc onne c te d o r o b struc te d p re ssure tub ing  
- De fe c tive ind uc e r m o to r o r sta rt c a p a c ito r.  
- De fe c tive p re ssure sw itc h o r c o nne c tio ns. If it o p e ns a fte r tria l fo r ig nitio n  
p e rio d , b lo we r will c o m e o n for 90 se c o nd re c yc le d e la y.  
33 LIMIT OR FLAME RO LL-OUT SWITCH IS O PEN - If o p e n lo ng e r tha n thre e  
m inute s, c o d e c ha ng e s to #13. Fla m e ro ll-o ut switc h re q uire s m a nua l re se t.  
C he c k fo r: - De fe c tive b lo we r m o to r o r c a p a c itor.  
- Dirty filte r or re stric te d d uc t syste m .  
- Lo o se b lo we r whe e l.  
- De fe c tive switc h o r c o nne c tio ns.  
- Ina d e q ua te Co m b ustio n a ir sup p ly (Fla m e Roll-out Switc h or fuse link).  
- Op e n Fla m e Ro ll-out sw itc h,or fuse link. Ma nua l re se t o r re p la c e .  
34 IG NITIO N PRO VING FAILURE - C ontro l will try thre e m o re tim e s b e fo re a  
loc kout #14 oc c urs. If fla m e sig na l lost a fte r tria l for ig nitio n p e riod , b lowe r  
w ill c o m e on fo r 90 se c ond re c yc le d e la y. C he c k for:  
- O xid e b uild up o n fla m e se nso r (c le a n w ith fine ste e l wo o l).  
- Pro p e r fla m e se nse m ic roa m p s (.5 m ic ro a m p s D.C . m in., 4.0 - 6.0 nom ina l).  
- G a s va lve d e fe c tive o r g a s va lve turne d off.  
- De fe c tive Ho t Surfa c e Ig nito r  
- Ma nua l va lve shut-o ff.  
- Lo w inle t g a s p re ssure .  
- G re e n wire MUST b e c o nne c te d to furna c e she e t m e ta l.  
- Ina d e q ua te fla m e c a rryo ve r or ro ug h ig nition.  
COMPONENT TEST  
To initia te the c o m p o ne nt te st se q ue nc e ,shut OFF the roo m the rm o sta t o r  
d isc o nne c t the "R" the rm o sta t le a d . Brie fly sho rt the TEST te rm ina l to the "Co m  
24V" te rm ina l. Sta tus LED will fla sh c o d e a nd the n turn O N the ind uc e r m o tor. The  
ind uc e r m oto r will run for the e ntire c o m p o ne nt te st. The ho t surfa c e ig nitor,  
b lo we r m o to r-he a t sp e e d , a nd b lo we r m o to r-c o o l sp e e d w ill b e turne d O N for  
10-15 se c ond s e a c h. G a s Va lve a nd Hum id ifie r will no t b e turne d o n.  
G
Com  
24V  
Y
W
R
HUM  
320615-102 REV. J  
A99107  
Fig. 16—Service Label  
12  
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13  
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14  
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15  
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SERVICE TRAINING  
Packaged Service Training programs are an excellent way to increase your  
knowledge of the equipment discussed in this manual, including:  
• Unit Familiarization  
• Installation Overview  
• Maintenance  
• Operating Sequence  
A large selection of product, theory, and skills programs is available, using popular  
video-based formats and materials. All include video and/or slides, plus companion  
book.  
Classroom Service Training plus "hands-on" the products in our labs can mean  
increased confidence that really pays dividends in faster troubleshooting, fewer  
callbacks. Course descriptions and schedules are in our catalog.  
CALL FOR FREE CATALOG 1-800-962-9212  
[ ] Packaged Service Training  
[ ] Classroom Service Training  
A94328  
Copyright 1999 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231  
58mxa6sm  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book  
Tab 6a 8a  
1
4
PC 101  
Catalog No. 535-745  
Printed in U.S.A.  
Form 58MXA-6SM  
Pg 16  
5-99  
Replaces: 58MXA-5SM  
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