Table of Contents
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35" Tall, High Efficiency Condensing Gas Furnace
DANGER, WARNING, CAUTION, and NOTE
The
signal
words
CAUTION, and NOTE are used to identify levels of
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manual that may
apply to the product.
DANGER − Immediate hazards which will result in
severe personal injury or death.
WARNING − Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION − Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE − Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
TABLE OF CONTENTS
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Printed in U.S.A.
SERVICE AND TECHNICAL
SUPPORT MANUAL
Two−Stage, ECM Blower Motor
Save this manual for future reference.
Safety Labeling and Signal Words
DANGER,
WARNING,
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(F/G)9MXT
Signal Words in Manuals
The signal word WARNING is used throughout
this manual in the following manner:
WARNING
!
The signal word CAUTION is used throughout
this manual in the following manner:
CAUTION
!
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or pictures or product labels.
Safety−alert symbol
When you see this symbol on the unit and in
instructions or manuals, be alert to the
potential for personal injury.
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MODELS
(F/G)9MXT0401410A
(F/G)9MXT0601714A
(F/G)9MXT0801716A
(F/G)9MXT0802120A
(F/G)9MXT1002120A
(F/G)9MXT1202422A
Use of the AHRI Certified TM Mark indicates a
manufacturer's participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .
440 04 4321 04
July 2012
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Table of Contents
Related Manuals for ICP F9MXT0401410A
Summary of Contents for ICP F9MXT0401410A
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Page 1: Table Of Contents
SERVICE AND TECHNICAL SUPPORT MANUAL Two−Stage, ECM Blower Motor 35” Tall, High Efficiency Condensing Gas Furnace (F/G)9MXT Save this manual for future reference. Safety Labeling and Signal Words DANGER, WARNING, CAUTION, and NOTE Signal Words in Manuals signal words DANGER, WARNING, The signal word WARNING is used throughout CAUTION, and NOTE are used to identify levels of... -
Page 2: Safety Considerations
SAFETY CONSIDERATIONS WARNING Improper ins t allation, adjus t ment, alteration, serv ic e, maintenance, or use can cause explosion, fire, electrical shock, PERSONAL INJURY, AND/OR PROPERTY or other conditions which may cause death, personal injury, or DAMAGE HAZARD property damage. Consult a qualified installer, service agency, Failure to carefully read and follow this warning could or your distributor or branch for information or assistance. - Page 3 SERVICE AND TECHNICAL MANUAL Gas Furnace: (F/G)9MXT START−UP CHECK SHEET For PSC Models (F/G)9MXT (This sheet is optional. Keep for future reference.) Date of Start−Up: Calculated Input (BTU) Rate: (See Checks and Adjustments Section). Dealer Name: Heating Check Address: Measured Line Pressure During High Heat: City, State(Province), Zip or Postal Code: Measured Manifold Pressure: High Heat...
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Page 4: Start−Up, Adjustment, And Safety Check
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT START−UP, ADJUSTMENT, AND SAFETY Prime Condensate Trap with Water CHECK WARNING General FIRE OR EXPLOSION HAZARD 1. Furnace must have a 115-v power supply properly connected and grounded. Failure to follow these warnings could result in personal injury or death. -
Page 5: Adjustments
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT WARNING NOTICE FIRE OR EXPLOSION HAZARD The NATURAL GAS manifold pressure adjustments in Table 3 Failure to follow this warning could result in personal injury, compensate for BOTH altitude AND gas heating value. DO death, and/or property damage. - Page 6 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 2. Obtain average yearly gas specific gravity from local gas WARNING supplier. 3. Find installation altitude in Table 3. FIRE HAZARD 4. Find closest natural gas heat value and specific gravity in Table 3.
- Page 7 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT k. Leave manometer or similar device connected and e. Measure time (in sec) for gas meter to complete one proceed to Step 2. revolution and note reading. The 2 or 5 cubic feet dial provides a more accurate measurement of gas flow.
- Page 8 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 4 Example of Two−Stage Furnace Control Board SET UP SWITCHES Î Î Î Î Î Î Î Î Î Î Î THERMOSTAT TYPE (TT) AND HEAT OFF−DELAY Î Î Î Î Î Î Î Î Î Î Î Î...
- Page 9 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Table 3 Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate TWO-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE...
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Page 10: Adjust Temperature Rise
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Table 3 (Cont.) Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate TWO-STAGE FURNACE (TABULATED DATA BASED ON 20,000 BTUH HIGH-HEAT / 13,000 BTUH LOW-HEAT PER BURNER, DERATED 2%/1000 FT (305M) ABOVE SEA LEVEL) ALTITUDE RANGE HEAT VALUE... -
Page 11: Adjust Blower Off Delay (Heat Mode)
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Adjust Continuous Fan Airflow Table 4 Blower Speed Taps The Continuous Fan airflow can be set from the remaining FACTORY COLOR SPEED blower speed taps. Refer to the Air Delivery Tables in these ATTACHED TO: instructions. -
Page 12: Check Safety Controls
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Table 6 AIR DELIVERY - CFM (with filter SPEED EXTERNAL STATIC PRESSURE (IN.W.C.) UNIT RETURN-AIR TAPS SIZE CONNECTION Gray 1120 1080 1030 Yellow Blue 0401410 SIDE/BOTTOM Orange Gray 1720 1670 1620 1565 1505 1440 1375... -
Page 13: Service And Maintenance Procedures
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT SERVICE AND MAINTENANCE Figure 6 Multipoise Orientations PROCEDURES WARNING FIRE, INJURY OR DEATH HAZARD Failure to follow this warning could result in personal injury, death and/or property damage. The ability to properly perform maintenance on this equipment requires certain knowledge, mechanical skills, tools, and equipment. - Page 14 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 7 Heating and Cooling Application Wiring Diagram with Single−Stage Thermostat FIELD 24-VOLT WIRING FIELD 115-, 208/230-, 460-VOLT WIRING FACTORY 24-VOLT WIRING FACTORY 115-VOLT WIRING NOTE 2 1-STAGE THERMOSTAT FIVE FIELD-SUPPLIED TERMINALS WIRE FUSED DISCONNECT THREE-WIRE...
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Page 15: Cleaning And/Or Replacing Air Filter
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 8. Release blower door switch, reattach wire to “R” terminal 3. Check electrical connections for tightness and controls on furnace control board and replace blower door. for proper operation each heating season. Service as necessary. - Page 16 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 4. If the vent and combustion air pipe passes through the Figure 8 Blower Assembly blower compartment, it will be necessary to remove the pipes from the blower compartment. MOTOR SHAFT FLAT Disconnect the vent and combustion air pipe by: a.
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Page 17: Cleaning Burners And Flame Sensor
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 6. Remove individual wires from terminals on gas valve. WARNING 7. Disconnect Hot Surface Igniter (HSI) wires from HSI. 8. Disconnect Flame Sensor wire from Flame Sensor. ELECTRICAL OPERATION HAZARD 9. Support the manifold and remove the four screws that Failure to follow this warning could result in personal secure the manifold assembly to the burner assembly injury or death. -
Page 18: Servicing Hot Surface Igniter
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 6. Attach the green/yellow wire and ground terminal to one 15. Turn gas on at electric switch on gas valve and at of the manifold mounting screws. external shut-off or meter 7. Install the remaining manifold mounting screws. 16. -
Page 19: Cleaning Condensate Drain And Trap
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 5. Attach a funnel with a flexible tube to port on the collector 11. Run the furnace through two complete heating cycles to box. check for proper operation 6. Flush inside of collector box with water until discharge 12. - Page 20 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT the heat exchanger assembly. Detailed information on heat Figure 12 Cleaning Heat Exchanger Cell exchanger removal can be obtained from your Distributor. Winterization CAUTION UNIT AND PROPERTY DAMAGE HAZARD Failure to follow this caution may result in unit component or property damage.
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Page 21: Service Label
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 14 Service Label 338313−2F 440 04 4321 04 Specifications subject to change without notice. -
Page 22: Wiring Diagram
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 15 Wiring Diagram 338313−2F 440 04 4321 04 Specifications subject to change without notice. - Page 23 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 16 Troubleshooting Guide − Flow Chart 440 04 4321 04 Specifications subject to change without notice.
- Page 24 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 16 (CONT.) Troubleshooting Guide − Flow Chart 440 04 4321 04 Specifications subject to change without notice.
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Page 25: Sequence Of Operation
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Sequence of Operation NOTE: Furnace control must be grounded for proper operation c. Trial−for−Ignition Sequence−When igniter or control will lockout. Control is grounded through green wire warm−up period is completed the main gas valve relay connected to gas valve and burner bracket screw. - Page 26 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 15. Two−Stage Thermostat and Two−Stage Heating (See 17. Dehumidify Mode Figure 17 − Figure 22 for thermostat connections) (See Figure 17 − Figure 22 for humidity sensing thermostat connections) The dehumidification output, H NOTE: In this mode the TT switch (SW1−1) must be ON to on the humidity sensing thermostat should be connected select the two−stage thermostat mode in response to closing...
- Page 27 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT (same speed as LO HEAT), and begin a low−heat cycle. Two−Stage Furnace with Two−Stage Air Figure 18 The blower motor BLWM will remain on until the end of Conditioner the prepurge period, then shut off for 24 seconds then come back on at LO HEAT speed.
- Page 28 2. Outdoor Air Temperature Sensor must be attached in all dual fuel application. 3. Refer to ICP thermostat Installation Instructions for additional information and setup procedure. 4. When using a Humidity Sensing Thermostat, set DEHUMIDIFY OPTIONS to H DE−ENRGZD FOR DEHUM 5.
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Page 29: Parts Replacement Information Guide
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT PARTS REPLACEMENT INFORMATION GUIDE Casing Group Gas Control Group Control door Manifold Blower door Burner Top filler plate Orifice Bottom filler plate Flame sensor Door Knob Assembly Hot surface igniter Gas valve Electrical Group Heat Exchanger Group Control box... -
Page 30: Product Nomenclature
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT PRODUCT NOMENCLATURE DIGIT POSITION 6, 7, 8 9, 10 11, 12 G = Mainline Look 1 F = Mainline Look 2 N = Entry 9 = 90% − 100% EFFICIENCY M = Multiposition H = Horizontal U = Upflow D = Downflow...