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SERVICE AND TECHNICAL SUPPORT MANUAL

Gas Furnace: (F/G)9MVE

Specifications  subject to change without notice.

16

440 04 4801 00

COOLING

4

 AND HEATING AIR DELIVERY - CFM (Bottom Return

5

 with filter)

Unit Size

Cooling Switch Settings

External Static Pressure (ESP)

SW2-8

SW2-7

SW2-6

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

080-20

Clg Default:

OFF

OFF

OFF

1905

1870

1825

1785

1750

1700

1665

1625

1560

1460

Cooling  (SW2)

OFF

OFF

ON

950

770

620

515

440

365

See note 

4

OFF

ON

OFF

1015

935

880

825

765

690

625

580

See note 

4

OFF

ON

ON

1155

1105

1040

990

920

875

815

755

710

645

ON

OFF

OFF

1335

1290

1245

1190

1145

1085

1040

990

930

890

ON

OFF

ON

1520

1485

1435

1390

1340

1300

1255

1200

1160

1115

ON

ON

OFF

1905

1870

1825

1785

1750

1700

1665

1625

1560

1460

ON

ON

ON

2290

2230

2160

2085

2005

1915

1820

1730

1640

1525

Clg SW2:

Maximum Clg Airflow 

2

2290

2230

2160

2085

2005

1915

1820

1730

1640

1525

Heating

(SW1)

High Heat Airflow 

3

1575

1535

1485

1445

1400

1350

1310

1260

1215

1170

Low Heat Airflow 

3

1230

1170

1125

1065

1015

955

900

855

795

755

100-20

Clg Default:

OFF

OFF

OFF

1890

1845

1800

1755

1700

1655

1610

1560

1510

1460

Cooling  (SW2)

OFF

OFF

ON

1015

825

630

485

405

325

See note 

4

OFF

ON

OFF

1080

895

815

740

690

615

555

475

See note 

4

OFF

ON

ON

1155

1080

1020

940

890

825

785

710

660

590

ON

OFF

OFF

1310

1260

1195

1140

1075

1025

970

925

875

810

ON

OFF

ON

1520

1475

1425

1365

1315

1255

1210

1155

1110

1055

ON

ON

OFF

1890

1845

1800

1755

1700

1655

1610

1560

1510

1460

ON

ON

ON

2290

2230

2160

2085

2005

1915

1820

1730

1640

1525

Clg SW2:

Maximum Clg Airflow 

2

2290

2230

2160

2085

2005

1915

1820

1730

1640

1525

Heating

(SW1)

High Heat Airflow 

3

1905

1865

1825

1775

1730

1685

1640

1590

1545

1490

Low Heat Airflow 

3

1480

1435

1375

1330

1265

1215

1160

1115

1060

1005

120-22

Clg Default:

OFF

OFF

OFF

2010

1960

1910

1850

1800

1750

1690

1645

1565

1480

Cooling  (SW2)

OFF

OFF

ON

1015

805

645

550

480

See note 

4

OFF

ON

OFF

1075

975

915

835

765

See note 

4

OFF

ON

ON

1205

1135

1055

1000

935

See note 

4

ON

OFF

OFF

1400

1330

1260

1190

1145

1080

1035

970

905

845

ON

OFF

ON

1615

1550

1500

1435

1370

1325

1265

1215

1160

1110

ON

ON

OFF

2010

1960

1910

1850

1800

1750

1690

1645

1565

1480

ON

ON

ON

note 8

2375

2300

2205

2115

2010

1890

1750

1645

1550

Clg SW2:

Maximum Clg Airflow 

2

note 8

2375

2300

2205

2115

2010

1890

1750

1645

1550

Heating

(SW1)

High Heat Airflow 

3

note 8

2375

2300

2205

2115

2010

1890

1750

1645

1550

Low Heat Airflow 

3

1735

1675

1625

1560

1500

1455

1395

1345

1285

1225

NOTE

:  

1. Nominal 350 CFM/ton cooling airflow is delivered with SW1

5 and SW2

2 set to OFF. 

Set both SW1

5 and SW2

2 to ON for +7% airflow (nominal 370 CFM/ton). 

Set SW1

5 to ON and SW2

2 to OFF for +15% airflow (nominal 400 CFM/ton). 

Set SW2

2 to ON and SW1

5 to OFF for 

7% airflow (nominal 325 CFM/ton). 

The above adjustments in airflow are subject to motor horspower range/capacity.

2. Maximum cooling airflow is achieved when switches SW2

6, SW2

7, SW2

8 and SW1

5 are set to ON, and SW2

2 is set to OFF.

3. All heating CFM’s are when low heat rise adjustment switch (SW1

3) and comfort/efficiency adjustment switch (SW1

4) are both set to OFF.

4. Ductwork must be sized for high

heating CFM within the operational range of ESP. Operation within the blank areas of the chart is not

recommended because high

heat operation will be above 1.0 ESP.

5. All airflows of 1880 CFM or less on 21” and 24.5” casing size furnaces are 5% less on side return only installations.
6. Airflows over 1800 CFM require bottom return, two

side return, or bottom and side return. A minimum filter size of 20” x 25” is required.

7. For upflow applications, air entering from one side into both the side of the furnace and a return air base counts as a side and bottom return.
8. Airflow not stable at this ESP.

Summary of Contents for F9MVE0401410A2

Page 1: ...oduct labels The signal word WARNING is used throughout this manual in the following manner Safety alert symbol When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury TABLE OF CONTENTS START UP ADJUSTMENT AND SAFETY CHECK 4 SETUP SWITCHES 4 PRIME CONDENSATE TRAP WITH WATER 4 PURGE GAS LINES 5 ADJUSTMENTS 5 ADJUST TEMPERATURE RISE 11 ADJUST...

Page 2: ...death WARNING signifies hazards which could result in personal injury or death CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage NOTE is used to highlight suggestions which will result in enhanced installation reliability or operation WARNING PERSONAL INJURY AND OR PROPERTY DAMAGE HAZARD Failure to carefully read and follow this w...

Page 3: ...ain Connected Condensate Drain Trapped Manual Gas Shut off Upstream of Furnace Drip Leg Gas Valve turned ON Type of Gas Natural Propane Filter Type and Size Shade in Final Furnace Settings Below O N O N Calculated Input BTU Rate See Checks and Adjustments Section Heating Check Measured Line Pressure During High Heat Measured Manifold Pressure High Heat Low Heat Temperature of Supply Air High Heat ...

Page 4: ...w settings for Air Conditioning and Continuous Fan CFM The Setup Switch locations are shown and described on Figure 4 Figure 5 and Table 5 The setup switches are also shown on the unit wiring label Setup Switches SW1 The furnace control has 8 setup switches that may be set to meet the application requirements To set these setup switches for the appropriate requirement 1 Remove blower door 2 Locate...

Page 5: ...hrough collector box overfill condensate trap and flow into open field drain 7 Remove funnel and tube from collector box and replace collector box drain plug Figure 1 Priming Condensate Drain L11F065 Representative drawing only some models may vary in appearance Purge Gas Lines If not previously done purge the lines after all connections have been made and check for leaks FIRE OR EXPLOSION HAZARD ...

Page 6: ...lier 3 Find installation altitude in Table 3 4 Find closest natural gas heat value and specific gravity in Table 3 Follow heat value and specific gravity lines to point of intersection to find orifice size and low and high heat manifold pressure settings for proper operation 5 Check and verify burner orifice size in furnace NEVER ASSUME ORIFICE SIZE ALWAYS CHECK AND VERIFY NOTICE If orifice hole a...

Page 7: ...e less than 3 2 in w c 797 Pa or more than 3 8 in w c 947 Pa for natural gas If required manifold pressure is outside this range change main burner orifices to obtain manifold pressure in this range c When correct input is obtained replace caps that conceal gas valve regulator adjustment screws Main burner flame should be clear blue almost transparent See Figure 14 d Re install manifold pressure t...

Page 8: ...UTRAL CONNECTIONS 115 VAC L1 LINE VOLTAGE CONNECTIONS EAC 1 TERMINAL 115 VAC 1 0 AMP MAX PL1 LOW VOLTAGE MAIN HARNESS CONNECTOR TRANSFORMER 24 VAC CONNECTIONS 3 AMP FUSE STATUS AND COMM LED LIGHTS SW1 SETUP SWITCHES AND BLOWER OFF DELAY MODEL PLUG CONNECTOR COMMUNICATION CONNECTOR AIR CONDITIONING A C CONTINUOUS FAN CF AIRFLOW SETUP SWITCHES OUTDOOR AIR TEMP CONNECTOR HUMIDIFIER TERMINAL 24 VAC 0 ...

Page 9: ...20 300 21 171 343 857 62 58 116 290 22 164 327 818 64 56 112 281 23 157 313 783 66 54 109 273 24 150 300 750 68 53 106 265 25 144 288 720 70 51 103 257 26 138 277 692 72 50 100 250 27 133 267 667 74 48 97 243 28 129 257 643 76 47 95 237 29 124 248 621 78 46 92 231 30 120 240 600 80 45 90 225 31 116 232 581 82 44 88 220 32 113 225 563 84 43 86 214 33 109 218 545 86 42 84 209 34 106 212 529 88 41 82...

Page 10: ...6 43 3 8 1 6 42 3 2 1 4 850 44 3 8 1 6 43 3 5 1 5 43 3 6 1 5 43 3 7 1 6 875 44 3 6 1 5 44 3 7 1 6 43 3 4 1 4 43 3 5 1 5 4000 900 44 3 4 1 4 44 3 5 1 5 44 3 7 1 5 44 3 8 1 6 1219 925 44 3 2 1 4 44 3 4 1 4 44 3 5 1 5 44 3 6 1 5 950 45 3 7 1 6 44 3 2 1 3 44 3 3 1 4 44 3 4 1 4 750 42 3 3 1 4 42 3 4 1 4 42 3 5 1 5 42 3 6 1 5 4001 775 43 3 7 1 6 43 3 8 1 6 42 3 3 1 4 42 3 4 1 4 1220 800 43 3 5 1 5 43 3 ...

Page 11: ...ure and airflow FURNACE DAMAGE HAZARD Failure to follow this caution may result in S Overheating the heat exchangers or condensing flue gases in heat exchanger areas not designed for condensate S Shortened furnace life S Component damage Temperature rise must be within limits specified on furnace rating plate Recommended operation is at midpoint of rise range or slightly above CAUTION Furnace must...

Page 12: ...er off delay See Table 4 and Figure 4 Figure 5 Table 4 Blower Speed Taps DESIRED HEATING MODE BLOWER OFF DELAY SEC SETUP SWITCH SW1 7 and 8 POSITION 90 OFF OFF 120 ON OFF 150 OFF ON 180 ON ON Adjust Cooling Airflow High Speed and Low Speed Cooling The ECM blower can be adjusted for a range of airflows for low speed or high speed cooling See Table 5 Air Delivery CFM with Filter and Figure 5 Furnace...

Page 13: ...or refer to unit wiring diagram TWN 1 CFM 2 3 4 5 6 7 8 SW2 CF AC SW2 1 Twining OFF Allows for selection of furnace Main OFF or Secondary ON when Twinned furnace setup is required See kit instructions for further directions on installation and setup SW2 2 CFM per ton Adjust OFF Allows additional CFM per ton selections when used with SW1 5 325 CFM per ton nominal when SW2 2 ON and SW1 5 OFF 350 CFM...

Page 14: ... this method to check limit control it can be established that limit is functioning properly and will operate if there is a restricted return air supply or motor failure If limit control does not function during this test cause must be determined and corrected a Run furnace for at least 5 minutes b Gradually block off return air with a piece of cardboard or sheet metal until the limit trips c Unbl...

Page 15: ...OFF OFF ON 605 565 510 455 420 See note 4 OFF ON OFF 785 750 705 675 630 585 See note 4 OFF ON ON 955 920 895 860 825 785 755 720 685 650 ON OFF OFF 1135 1110 1080 1055 1020 990 935 880 825 745 ON OFF ON 1250 1210 1165 1115 1065 1015 955 895 815 745 ON ON OFF 1250 1210 1165 1115 1065 1015 955 895 815 745 ON ON ON 1250 1210 1165 1115 1065 1015 955 895 815 745 Clg SW2 Maximum Clg Airflow2 1250 1210 ...

Page 16: ...20 22 Clg Default OFF OFF OFF 2010 1960 1910 1850 1800 1750 1690 1645 1565 1480 Cooling SW2 OFF OFF ON 1015 805 645 550 480 See note 4 OFF ON OFF 1075 975 915 835 765 See note 4 OFF ON ON 1205 1135 1055 1000 935 See note 4 ON OFF OFF 1400 1330 1260 1190 1145 1080 1035 970 905 845 ON OFF ON 1615 1550 1500 1435 1370 1325 1265 1215 1160 1110 ON ON OFF 2010 1960 1910 1850 1800 1750 1690 1645 1565 1480...

Page 17: ...nce this furnace can be installed in any of the 4 positions shown in Figure 7 you must revise your orientation to component location accordingly Figure 7 Multipoise Orientations A93041 Electrical Controls and Wiring ELECTRICAL SHOCK HAZARD Failure to follow this warning could result in personal injury or death There may be more than one electrical supply to the furnace Check accessories and coolin...

Page 18: ...disconnecting the limit switch To retrieve Status Codes follow the procedure below 2 Turn Setup Switch SW1 1 ON 3 Manually close blower door switch 4 Control will flash up to 7 Status Codes 5 The last Status Code or 8th Code will be a heartbeat 6 Turn SW1 1 OFF 7 A heartbeat amber LED will appear and indicates proper operation 8 Release blower door switch install control door and refer to the SERV...

Page 19: ...s for proper operation each heating season Service as necessary 4 Inspect burner compartment before each heating season for rust corrosion soot or excessive dust If necessary have furnace and burner serviced by a qualified service agency 5 Inspect the vent pipe vent system before each heating season for water leakage sagging pipes or broken fittings Have vent pipes vent system serviced by a qualif...

Page 20: ... balance will be affected 7 If greasy residue is present on blower wheel remove wheel from the blower housing and wash it with an appropriate degreaser To remove wheel a Mark blower wheel location on shaft before disassembly to ensure proper reassembly 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 ...

Page 21: ... following items must 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 NOTE Use a back up wrench on the gas valve to prevent the valve from rotating on the manifold or damaging the mounting to the burner assembly ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could resul...

Page 22: ...the Hot Surface Igniter NOTE Use propane resistant pipe dope to prevent leaks Do not use Teflon tape 13 Install the gas pipe to the gas valve Figure 12 Igniter Position Side View L12F041 2ïin 2 5 mm 3 8ïin 3 16ïin 0 8 ï1 5 mm 50 mm 9 6 mm 4 6 mm 1 10ïin 1 32 ï 1 16ïin FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury death and or property damage Never purge a ...

Page 23: ...equired Verify a condensate trap gasket is included in the service kit or obtain one from your local distributor 1 Disconnect power at external disconnect fuse or circuit breaker 2 Turn off gas at external shut off or gas meter 3 Remove control door and set aside 4 Turn electric switch on gas valve to OFF 5 Disconnect external drain from condensate drain elbow or drain extension pipe inside the fu...

Page 24: ...reign objects that may restrict flow of combustion products 8 Reverse items 6 through 1 for reassembly 9 Refer to furnace wiring diagram and reconnect wires to flame rollout switch gas valve igniter and flame sensor 10 Turn on gas and electrical supplies to furnace 11 Check furnace operation through two complete heat operating cycles Look at burners Burner flames should be clear blue almost transp...

Page 25: ...lied 3 8 in 9 5 mm ID tube to the open port on the collector box 6 Insert a field supplied funnel into the tube 7 Pour 1 quart of anti freeze solution into the funnel tube Antifreeze should run through the collector box overfill condensate trap and flow to an open drain 8 Replace the rubber plug in the port on the collector box 9 Remove the middle unused rubber plug from the port on the collector ...

Page 26: ...SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace F G 9MVE Specifications subject to change without notice 440 04 4801 00 26 Figure 15 Service Label 340688 2 REV A ...

Page 27: ...SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace F G 9MVE Specifications subject to change without notice 27 440 04 4801 00 Figure 16 Wiring Diagram 340688 2 REV B ...

Page 28: ...at flashes When done put setup switch SW1 1 in the OFF position Was there a previous status code other than the heartbeat Go to section below for the status code that was flashed Does the control respond to W W1 W2 Y1 Y Y2 and G 24V thermostat signals Run system through a low heat high heat or cooling cycle to check operation Status codes are erased after 72 hours or can be manually erased by putt...

Page 29: ...at check manifold pressure If OK check burner carryover and flame sensor location Clean flame sensor with fine steel wool and recheck current Nominal current is 4 0 to 6 0 microamps Is current near typical value Replace electrode Will main burners ignite and stay on Replace furnace control Fixed NO YES YES YES NO NO Replace furnace control Check for continuity in the harness and igniter Replace de...

Page 30: ...at high speed and the high heat pressure switch relay HPSR is de energized to close the NC contact When sufficient pressure is available the high heat pressure switch HPS closes and the high heat gas valve solenoid GV HI is energized The furnace control CPU begins a 15 second prepurge period after the low heat pressure switch LPS closes If the high heat pressure switch HPS fails to close and the l...

Page 31: ...otor BLWM will continue operating at cooling airflow for an additional 90 seconds Jumper Y Y2 to DHUM to reduce the cooling off delay to 5 seconds See Figure 4 b Two Stage Thermostat and Two Speed Cooling See Figure 19 and Figure 21 for thermostat connections The thermostat closes the R to G and Y1 circuits for low cooling or closes the R to G and Y1 and Y2 circuits for high cooling The R to Y1 ci...

Page 32: ...heat pump the furnace control automatically changes the timing sequence to avoid long blower off times during demand defrost cycles Whenever W W1 is energized along with Y1 or Y Y2 the furnace control CPU will transition to or bring on the blower motor BLWM at cooling airflow low heat airflow or whichever is lowest The blower motor BLWM will remain on until the main burners ignite then shut OFF an...

Page 33: ...4801 00 Figure 20 Variable Speed Furnace with Single Stage Heat Pump Dual Fuel L09F026 NOTE 9 Figure 21 Variable Speed Furnace with Two Stage Heat Pump Dual Fuel L09F028 NOTE 9 Figure 22 Variable Speed Furnace and Humidifier Only L09F029 Figure 23 AC with Variable Speed Furnace Humidifier and Dehumidification L09F029 ...

Page 34: ...nstallation Instructions for additional information and setup procedure 4 When using a Humidity Sensing Thermostat set DEHUMIDIFY OPTIONS to H DE ENRGZD FOR DEHUM 5 Optional connection If wire is connected SW1 2 on VS furnace control should be set in ON position to allow ICP Thermostat to control the furnace staging 6 HUM connection is 24 VAC and is energized when the blower turns on during a call...

Page 35: ...lector box Condensate trap Condensate trap elbow Gaskets WARNING FIRE EXPLOSION ELECTRICAL SHOCK AND CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in dangerous operation personal injury death or property damage Improper installation adjustment alteration service maintenance or use can cause carbon monoxide poisoning explosion fire electrical shock or other conditions...

Page 36: ...riable Speed X ECM S Single stage T Two stage FEATURE B Base AFUE Efficiency E Extra AFUE Efficiency C Communicating D Dual Certified 2 pipe or 1 pipe R 2 pipe only S Single stage T Two stage N Standard L Low Nox FEATURE 040 40 000 BTU hr 060 60 000 BTU hr 080 80 000 BTU hr 100 100 000 BTU hr 120 120 000 BTU hr INPUT HEAT 14 14 3 16 17 17 1 2 21 21 24 24 1 2 CABINET WIDTH 10 1000 CFM max 14 1400 C...

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