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SERVICE AND TECHNICAL SUPPORT MANUAL

Gas Furnace: (F/G)9MVE

Specifications  subject to change without notice.

4

440 04 4801 04

START

UP, ADJUSTMENT, AND SAFETY

CHECK

NOTICE

IMPORTANT INSTALLATION AND START

UP

PROCEDURES

Failure to follow this procedure may result in a nuisance smoke

or odor complaint.
The manifold pressure, gas rate by meter clocking, temperature

rise and operation must be checked after installation. Minor

smoke and odor may be present temporarily after start

up from

the manufacturing process. Some occupants are more

sensitive to this minor smoke and odor. It is recommended that

doors and windows be open during the first heat cycle.

General

1. Furnace must have a 115-v power supply properly

connected and grounded.

NOTE

:  Proper polarity must be maintained for 115-v wiring.

Control status indicator light flashes code 10 and furnace does
not operate if polarity is incorrect or if the furnace is not
grounded.

2. Thermostat wire connections at terminals R, W/W1, G,

and Y/Y2 must be made at 24-v terminal block on

furnace control.

3. Natural gas service pressure must not exceed 0.5 psig

(14- in. w.c., 350 Pa), but must be no less than 0.16 psig

(4.5-in. w.c., 1125 Pa).

4. Blower door must be in place to complete 115-v electrical

circuit and supply power to furnace components.

UNIT OPERATION HAZARD

Failure to follow this caution may result in intermittent unit

operation or performance satisfaction.
These furnaces are equipped with a manual reset limit

switch in burner assembly.  This switch opens and shuts

off power to the gas valve if an overheat condition (flame

rollout) occurs in burner assembly.  Correct inadequate

combustion

air supply or improper venting condition

before resetting switch.  DO NOT jumper this switch.

CAUTION

!

Before operating furnace, check flame rollout manual reset

switch for continuity. If necessary, press button to reset switch.
EAC-1 terminal is energized whenever blower operates. HUM

terminal is only energized when blower is energized in heating.

Setup Switches

There are four sets of setup switches on the furnace control

board. These switches configure the furnace for correct

application requirement. They also select the airflow 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 setup switches on furnace control.
3. Configure the set-up switches as necessary for the

application.

4. Replace blower door.

NOTE

:  If a bypass humidifier is used, setup switch SW1-3

(Low Heat Rise Adjust) should be in ON position. This
compensates for the increased temperature in return air

resulting from bypass.

Setup Switch (SW2)

Setup switches SW2 are used for applications used for

Twinning two furnaces of the same model and BTU’s and to

adjust airflow. SW2

2 is used to adjust airflow. Refer to the

Adjustments section for set up switch configurations. Refer to

Figure 5

 for configuration of SW2 airflow options.

1. Remove blower door.
2. Locate setup switch SW2 on furnace control.
3. Configure the switches as necessary for the application.
4. Replace blower door.

Continuous Fan (CF) Setup Switches (SW2

5,

SW2

4, SW2

3)

The CF setup switches are used to select desired airflow when

thermostat is in continuous fan mode or to select low-cooling

airflow for two-speed cooling units. Refer to the Adjustments

section for set up switch configurations.
To set the desired cooling airflow:

1. Remove blower door.
2. Locate CF setup switches on furnace control.
3. Determine air conditioning tonnage used for low cooling

(when used) or desired continuous fan airflow.

4. Configure the switches for the required airflow.
5. Replace blower door.

Air Conditioning (A/C) Setup Switches (SW2

6,

SW2

7, SW2

8)

The air conditioning setup switches are used to match furnace

airflow to required cooling airflow or high stage cooling airflow

when a two

stage outdoor unit is used. Refer to the

Adjustments section for set up switch configurations.
To set the desired cooling airflow:

1. Remove blower door.
2. Locate A/C setup switches on furnace control.
3. Determine air conditioning tonnage used.
4. Configure the switches for the required cooling airflow.
5. Replace blower door.

NOTE

:  Incorrect airflow caused by improper A/C switch setup

may cause condensate blow-off or frozen indoor coil in the
cooling mode.

Prime Condensate Trap with Water

!

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow these warnings could result in personal injury

or death.
Failure to use a properly configured trap or NOT

water-priming trap before operating furnace may allow

positive pressure vent gases to enter the structure through

drain tube. Vent gases contain carbon monoxide which is

tasteless and odorless.

Summary of Contents for F9MVE Series

Page 1: ...abels 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 f...

Page 2: ...l result in enhanced installation reliability or operation FIRE EXPLOSION ELECTRICAL SHOCK AND CARBON MONOXIDE POISONING HAZARD Failure to follow this warning could result in dangerous operation perso...

Page 3: ...in 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...

Page 4: ...l 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 Lo...

Page 5: ...soap solution made specifically for the detection of leaks to check all connections A fire or explosion may result causing property damage personal injury or loss of life WARNING Adjustments FIRE HAZ...

Page 6: ...0 Btu cu ft Specific gravity 0 62 Therefore Orifice No 44 Furnace is shipped with No 44 orifices In this example all main burner orifices are the correct size and do not need to be changed to obtain p...

Page 7: ...ease input rate Figure 3 Redundant Automatic Gas Control Valve 2 Stage without Tower Pressure Ports ON OFF Switch Regulator Seal Cap RegulatorAdjustment Regulator Seal Cap under Cap 1 2 NPT Outlet 1 8...

Page 8: ...s warning could result in personal injury death and or property damage Manifold pressure tap set screw must be tightened or 1 8 in NPT pipe plug must be installed to prevent gas leaks WARNING c Tighte...

Page 9: ...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...

Page 10: ...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...

Page 11: ...re 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 Short...

Page 12: ...r 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 Co...

Page 13: ...r 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...

Page 14: ...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 de...

Page 15: ...FF 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...

Page 16: ...0 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 105...

Page 17: ...itioned air is discharged upward Since 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...

Page 18: ...isconnecting 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...

Page 19: ...eason 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...

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 s...

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...

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 2 in 2 5 mm...

Page 23: ...quired 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 exte...

Page 24: ...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 op...

Page 25: ...uart 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 collec...

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

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

Page 28: ...t 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 respo...

Page 29: ...t 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 typ...

Page 30: ...t 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 v...

Page 31: ...tor 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 Cool...

Page 32: ...eat 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...

Page 33: ...801 04 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...

Page 34: ...stallation 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 conne...

Page 35: ...ector 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...

Page 36: ...ed 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 N...

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