Table of Contents
Advertisement
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 ï Immediate hazards which will result in
severe personal injury or death.
WARNING ï Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION ï Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE ï Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
TABLE OF CONTENTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Printed in U.S.A.
SERVICE AND TECHNICAL
SUPPORT MANUAL
TwoïStage, ECM Blower Motor
Save this manual for future reference.
Safety Labeling and Signal Words
DANGER,
WARNING,
. . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . .
. . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . .
. . . .
. . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . .
(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.
Safetyïalert symbol
When you see this symbol on the unit and in
instructions or manuals, be alert to the
potential for personal injury.
4
4
4
4
5
9
9
9
10
10
10
10
12
12
12
14
14
16
17
17
18
18
20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MODELS
(F/G)9MXT0401410A
(F/G)9MXT0601714A
(F/G)9MXT0801716A
(F/G)9MXT1002116A
(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 02
21
24
28
29
Aug. 2011
Advertisement
Table of Contents
Related Manuals for International comfort products F9MXT0401410A
Summary of Contents for International comfort products F9MXT0401410A
-
Page 1: Table Of Contents
SERVICE AND TECHNICAL SUPPORT MANUAL TwoïStage, 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 tallation, adjus tment, 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 STARTïUP CHECK SHEET For PSC Models (F/G)9MXT (This sheet is optional. Keep for future reference.) Date of StartïUp: 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...
-
Page 4: Startïup, Adjustment, And Safety Check
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT STARTïUP, ADJUSTMENT, AND SAFETY Prime Condensate Trap with Water CHECK CAUTION General UNIT OPERATION HAZARD 1. Furnace must have a 115-V power supply properly connected and grounded. Failure to follow this caution may result in intermittent unit NOTE: Proper polarity must be maintained for 115-V wiring. -
Page 5: Adjustments
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Adjustments d. Find closest natural gas heat value and specific gravity in Table 2. e. Follow heat value and specific gravity lines to point of WARNING intersection to find orifice size and lowïand highïheat manifold pressure settings for proper operation. - Page 6 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT screwdriver) counterclockwise (out) to decrease input b. Remove regulator adjustment cap from highïheat rate or clockwise (in) to increase input rate. gas valve pressure regulator (See Figure 3) and turn high heat adjusting screw (3/16ïin. or smaller Redundant Automatic Gas Control flatïtipped screwdriver) counterclockwise (out) to Figure 3...
- Page 7 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Table 2 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 8 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Table 2 (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 9: Adjust Temperature Rise
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Adjust Temperature Rise WARNING NOTE: Blower door must be installed when taking temperature rise reading. Leaving blower door off will result in incorrect ELECTRICAL OPERATION HAZARD temperature measurements. Failure to follow this warning could result in personal injury or death. -
Page 10: Adjust Continuous Fan Airflow
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Adjust Continuous Fan Airflow Check Safety Controls The Continuous Fan airflow can be set from the remaining The flame sensor, gas valve, and pressure switch were all blower speed taps. Refer to the Air Delivery Tables in these checked in the Startïup procedure section as part of normal instructions. - Page 11 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Table 5 Gas Rate (CU ft./hr) SECONDS G SIZE OF TEST DIAL SECONDS SIZE OF TEST DIAL FOR 1 REVOLUTION FOR 1 REVOLUTION 1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1 Cu Ft.
-
Page 12: 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 13 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 7 Typical TwoïStage Field Wiring Diagram 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 208/230- OR HEATING- 460-VOLT...
-
Page 14: Cleaning And/Or Replacing Air Filter
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Care and Maintenance 3. Check electrical connections for tightness and controls for proper operation each heating season. Service as necessary. WARNING 4. Inspect burner compartment before each heating season for rust, corrosion, soot or excessive dust. If necessary, FIRE OR EXPLOSION HAZARD have furnace and burner serviced by a qualified service Failure to follow this warning could result in personal... - Page 15 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 3. All factory wires can be left connected, but field 14. Reconnect blower leads to furnace control. Refer to thermostat and accessory wiring may need to be furnace wiring diagram, and connect thermostat leads if disconnected depending on their length and routing.
-
Page 16: Cleaning Burners And Flame Sensor
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 4. Turn electric switch on gas valve to OFF. WARNING 5. Disconnect the gas pipe from gas valve and remove pipe from the furnace casing. ELECTRICAL OPERATION HAZARD 6. Remove individual wires from terminals on gas valve. Failure to follow this warning could result in personal 7. -
Page 17: Servicing Hot Surface Igniter
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT fully seated forward in the burner assembly. Remove the 14. Check for gas leaks with a commercially available soap manifold and check burner positioning in the burner assembly solution made specifically for the detection of leaks. assembly before re-installing the manifold. -
Page 18: Cleaning Condensate Drain And Trap
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 4. Remove the collector box plug from the top port on the 6. Connect condensate drain elbow or drain extension upper corner of the collector box. (See Figure 1) elbow to the condensate trap 5. -
Page 19: Burner Flame
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT NOTE: Burner cover, manifold, gas valve, and burner Secondary Heat Exchangers assembly should be removed as one assembly. The condensing side (inside) of the secondary heat exchanger 7. Clean heat exchanger openings with a vacuum and a CANNOT be serviced or inspected without complete removal of soft brush. -
Page 20: Service Label
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 14 Service Label 338313ï2E 440 04 4321 02 Specifications subject to change without notice. -
Page 21: Wiring Diagram
SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 15 Wiring Diagram 338313ï2 Rev E Specifications subject to change without notice. 440 04 4321 02... - Page 22 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 16 Troubleshooting Guide 440 04 4321 02 Specifications subject to change without notice.
- Page 23 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT Figure 16 (CONT.) Troubleshooting Guide Specifications subject to change without notice. 440 04 4321 02...
-
Page 24: 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. TrialïforïIgnition SequenceïWhen igniter or control will lockout. Control is grounded through green wire warmïup period is completed the main gas valve relay connected to gas valve and burner bracket screw. - Page 25 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT 15. TwoïStage Thermostat and TwoïStage Heating (See 17. Dehumidify Mode Figure 17 ï Figure 22 for thermostat connections) (See Figure 17 ï Figure 22 for humidity sensing thermostat connections) The dehumidification output, H NOTE: In this mode the TT switch (SW1ï1) must be ON to on the humidity sensing thermostat should be connected select the twoïstage thermostat mode in response to closing...
- Page 26 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT (same speed as LO HEAT), and begin a lowïheat cycle. TwoïStage Furnace with TwoïStage 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 27 SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MXT TwoïStage Furnace with TwoïStage HP with TwoïStage Furnace, Humidifier, Figure 20 Figure 22 Heat Pump (Dual Fuel) and Dehumidification Figure 23 TwoïStage Furnace and Humidifier Only AC with TwoïStage Furnace, Humidifier, Figure 21 and Dehumidification For Figure 17 ï...
-
Page 28: 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 29: Product Nomenclature
20 = 2000 CFM (max) 22 = 2200 CFM (max) COOLING AIRFLOW SALES (MAJOR) REVISION DIGIT ENGINEERING (MINOR) REVISION DIGIT International Comfort Products, LLC Consumer Relations Department P.O. Box 128 Lewisburg, TN 37091, USA 931ï270ï4100 Specifications subject to change without notice.