International Comfort Products G9MVT0401410A, G9MVT0601714A, G9MVT0801716A, G9MVT0802120A, G9MVT1002120A User Manual

...

SERVICE AND TECHNICAL

SUPPORT MANUAL

Two−Stage, Variable Speed ECM Blower Motor

35” Tall, High Efficiency Condensing Gas Furnace

(F/G)9MVT

Save this manual for future reference.

Safety Labeling and Signal Words

DANGER, WARNING, CAUTION, and NOTE

The signal words DANGER, WARNING, 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.

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.

TABLE OF CONTENTS

START−UP, ADJUSTMENT, AND SAFETY CHECK 4...........

SELECT SETUP SWITCH POSITIONS 4.....................

CONTINUOUS FAN (CF) SETUP SWITCHES (SW3) 4.........

PRIME CONDENSATE TRAP WITH WATER 4.................

PURGE GAS LINES 5......................................

ADJUSTMENTS 5.........................................

ADJUST TEMPERATURE RISE 10............................

ADJUST BLOWER OFF DELAY (HEAT MODE) 11..............

ADJUST COOLING AIRFLOW 11.............................

ADJUST CONTINUOUS FAN AIRFLOW 11....................

ADJUST THERMOSTAT HEAT ANTICIPATOR 13...............

CHECK SAFETY CONTROLS 13.............................

CHECKLIST 13.............................................

COOLING AND HEATING AIR DELIVERY - CFM 14............

SERVICE AND MAINTENANCE PROCEDURES 16.............

ELECTRICAL CONTROLS AND WIRING 16...................

TROUBLESHOOTING 17....................................

CARE AND MAINTENANCE 18...............................

CLEANING AND/OR REPLACING AIR FILTER 18..............

BLOWER MOTOR AND WHEEL MAINTENANCE 19............

CLEANING BURNERS AND FLAME SENSOR 20...............

SERVICING HOT SURFACE IGNITER 21......................

FLUSHING COLLECTOR BOX AND DRAINAGE SYSTEM 22....

CLEANING CONDENSATE DRAIN AND TRAP 22..............

CLEANING HEAT EXCHANGERS 22..........................

SERVICE LABEL 25.........................................

WIRING DIAGRAM 26.......................................

TROUBLESHOOTING GUIDE − FLOW CHART 27..............

SEQUENCE OF OPERATION 29.............................

PARTS REPLACEMENT INFORMATION GUIDE 34.............

PRODUCT NOMENCLATURE 35.............................

MODELS

(F/G)9MVT0401410A (F/G)9MVT0601714A (F/G)9MVT0801716A (F/G)9MVT0802120A (F/G)9MVT1002120A (F/G)9MVT1202422A

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 .

Printed in U.S.A. 440 04 4221 03 Dec. 2011

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory−authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes, the current editions of the National Fuel Gas Code (NFCG) NFPA 54/ANSI Z223.1, and the National Electrical Code (NEC) NFPA 70.

In Canada refer to the current editions of the National standards of Canada CAN/CSA−B149.1 and .2 Natural Gas and Propane Installation Codes, and Canadian Electrical Code CSA C22.1.

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. Understand these signal words; DANGER, WARNING, and CAUTION. These words are used with the safety−alert symbol. DANGER 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 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 warning could result in equipment malfunction, property damage, personal injury and/or death. Installation or repairs made by unqualified persons could result in equipment malfunction, property damage, personal injury and/or death. The information contained in this manual is intended for use by a qualified service technician familiar with safety procedures and equipped with proper tools and test instruments. Installation must conform with local building codes and with the Natural Fuel Gas Code (NFCG) NFPA 54/ANSI Z223.1, and National standards of Canada CAN/CSA−B149.1 and .2 Natural Gas and Propane Installation Codes.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, always turn off main power switch to unit and install lockout tag. Unit may have more than one power switch.

WARNING

CARBON MONOXIDE POISONING AND FIRE HAZARD

Failure to follow safety warnings could result in personal injury, death, and/or property damage.

This furnace is not designed for use in mobile homes, trailers or recreational vehicles.

CAUTION

CUT HAZARD

Failure to follow this caution may result in damage personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.

Specifications are subject to change without notice.

440 04 4221 03

SERVICE AND TECHNICAL MANUAL Gas Furnace: (F/G)9MVT

START−UP CHECK SHEET

For Variable Speed Models (F/G)9MVT

(This sheet is optional. Keep for future reference.)

Date of Start−Up:

Dealer Name:

Address:

City, State(Province), Zip or Postal Code:

Phone:

Owner Name:

Address:

City, State(Province), Zip or Postal Code:

Model Number:

Serial Number:

Setup Checks

Check the box when task is complete.

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

Low Heat

Temperature of Return Air:

Temperature Rise (Supply − Return): High Heat

Low Heat

In Rise Range (see furnace rating plate)?

Static Pressure (Ducts) High Heat: Supply

Return

All Electrical Connections Tight?

Have hoses been relocated for furnace U/D/H application?

Condensate Drain 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:

PL9

SW4

3 2 1

O N

PL4

SW−1

8 7 6 5 4 3 2 1

SW2 SW3

OAT

O N

PL7

Optional Check: CO?

CO2?

Cooling Check

Temperature of Supply Air:

Temperature of Return Air:

Temperature Difference:

Static Pressure (Ducts) Cooling: Supply

Return

Dealer Comments:

3 2 1

440 01 4221 03 3

3 2 1

O N

Specifications subject to change without notice.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

START−UP, ADJUSTMENT, AND SAFETY CHECK

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.

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.), but must be no less than 0.16 psig (4.5-in. w.c.).

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

CAUTION

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.

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.

NOTE: Excessive airflow caused by improper A/C switch setup may cause condensate blow-off in cooling mode.

5. Replace blower door.

Continuous Fan (CF) Setup Switches (SW3)

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. This setup feature allows continuous fan airflow or low-cooling airflow to be adjusted. To set desired continuous fan airflow or low-cooling airflow:

1. Remove blower door.

2. Locate CF setup switches on furnace control.

3. Determine desired continuous fan airflow or low-cooling airflow.

4. Configure the switches for the required continuous fan or low−cooling airflow.

5. Replace blower door.

Setup Switch (SW4)

Setup switches SW4 are used for applications using a communicating wall control and to adjust airflow. Refer to the communicating wall control instructions for configuration of SW4 for communications. Refer to Figure 5 for configuration of SW4 airflow options.

Prime Condensate Trap with Water

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.

Select Setup Switch Positions

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:

S Remove blower door. S Locate setup switches on furnace control. S Configure the set-up switches as necessary for the

application.

S 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.

Air Conditioning (A/C) Setup Switches (SW2)

The air conditioning setup switches are used to match furnace airflow to cooling unit used.

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in intermittent unit operation or performance satisfaction.

Condensate trap must be PRIMED or proper draining may not occur. The condensate trap has two internal chambers which can ONLY be primed by pouring water into the inducer drain side of condensate trap.

1. Remove upper and middle collector box drain plugs opposite of the condensate trap. (See Figure 1)

2. Connect field-supplied 1/2-in. (13 mm) OD tube to upper collector box drain connection.

3. Insert field-supplied funnel into tube.

4. Pour one quart of water into funnel/tube. Water should run through collector box, overfill condensate trap, and flow into open field drain.

5. Remove funnel; replace collector box drain plug.

6. Connect field-supplied 1/2-in. (13 mm) OD tube to middle collector box drain port.

7. Pour one quart of water into funnel/tube. Water should run through collector box, overfill condensate trap, and flow into open field drain.

8. Remove funnel and tube from collector box and replace collector box plug.

4 440 04 4221 03

Specifications subject to change without notice.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

Figure 1 Priming Condensate Drain

Representative drawing only, some models may vary in appearance.

L11F065

Purge Gas Lines

If not previously done, purge the lines after all connections have been made and check for leaks.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available 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 HAZARD

Failure to follow this warning could result in personal injury, death and/or property damage.

DO NOT bottom out gas valve regulator adjusting screw. This can result in unregulated manifold pressure and result in excess overfire and heat exchanger failures.

FURNACE DAMAGE HAZARD

Failure to follow this caution may result in reduced furnace life.

DO NOT redrill orifices. Improper drilling (burrs, out−of−round holes, etc.) can cause excessive burner noise and misdirection of burner flames. This can result in flame impingement of heat exchangers, causing failures. (See

Figure 2)

WARNING

CAUTION

Figure 2 Orifice Hole

BURNER

ORIFICE

A93059

For proper operation and long term reliability the furnace input rate must be within +/− 2 percent of input rate on furnace rating plate.

The gas input rate on rating plate is for installation at altitudes up to 2000 ft. (610 M).

In the U.S.A., the input rating for altitudes above 2000 ft. (610 M) must be reduced by 2 percent for each 1000 ft. (305 M) above sea level refer to Table 1.

In Canada, the input rating must be derated by 5 percent for altitudes of 2000 ft. (610 M) to 4500 ft. (1372 M) above sea level.

To adjust manifold pressure to obtain the proper input rate, first, determine if the furnace has the correct orifice installed. At higher altitudes or different gas heat contents, it may be necessary to change the factory orifice to a different orifice. Tables have been provided in the furnace Service and Technical Manual to match the required orifice to the manifold pressure to the heat content and specific gravity of the gas. to do this:

a. Obtain average yearly gas heat value (at installed

altitude) from local gas supplier.

b. Obtain average yearly gas specific gravity from local

gas supplier.

c. Find installation altitude in Table 3. d. Find closest natural gas heat value and specific

gravity in Table 3.

e. 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.

f. Check and verify burner orifice size in furnace.

NEVER ASSUME ORIFICE SIZE. ALWAYS CHECK AND VERIFY.

g. Replace orifice with correct size, if required by

Table 3. Use only factory−supplied orifices. See EXAMPLE.

EXAMPLE: 0 - 2000 ft. (0 - 609.6M) altitude Heating value = 1050 Btu/cu ft. Specific gravity = 0.62 Therefore: Orifice No. 44 Manifold pressure: 3.4-in. w.c. for high heat, 1.4-in. w.c. for low heat * 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 proper input rate.

440 04 4221 03 5

Specifications subject to change without notice.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

Table 1 Altitude Derate Multiplier for U.S.A.

ALTITUDE

FT. (M)

0–2000 (0−610)

2001–3000

(610−914)

3001–4000

(914−1219)

4001–5000

(1219−1524)

5001–6000

(1524−1829)

6001–7000

(1829−2134)

7001–8000

(2134−2438)

8001–9000

(2438−2743)

9001–10,000

(2743−3048)

* Derate multiplier factors are based on midpoint altitude for altitude range.

NOTE: For Canadian altitudes of 2000 to 4500 ft. (610 to 1372 M), use USA altitudes of 2001 to 3000 ft. (610 to 914 M)

NOTE: If orifice hole appears damaged or it is suspected to

have been redrilled, check orifice hole with a numbered drill bit of correct size. Never redrill an orifice. A burr−free and squarely aligned orifice hole is essential for proper flame characteristics.

1. Adjust manifold pressure to obtain low fire input rate.

(See Figure 3)

a. Turn gas valve ON/OFF switch to OFF. b. Remove manifold pressure tap plug from gas valve.

c. Connect a water column manometer or similar device

to manifold pressure tap. d. Turn gas valve ON/OFF switch to ON. e. Move setup SW1—2 on furnace control to ON

position to lock furnace in low−heat operation. (See

Figure 4 and Figure 5)

f. Manually close blower door switch.

g. Jumper R and W/W1 thermostat connections on

control to start furnace. (See Figure 4) h. Remove regulator adjustment cap from low heat gas

valve pressure regulator (See Figure 3) and turn

low−heat adjusting screw (3/16 or smaller flat−tipped

screwdriver) counterclockwise (out) to decrease input

rate or clockwise (in) to increase input rate.

NOTE: DO NOT set low−heat manifold pressure less than

1.3−in. w.c. or more than 1.7−in. w.c. for natural gas. If manifold pressure is outside this range, change main burner orifices.

i. Install low−heat regulator adjustment cap. j. Move setup switch SW1−2 to off position after

completing low−heat adjustment.

k. Leave manometer or similar device connected and

proceed to Step 2.

2. Adjust manifold pressure to obtain high fire input rate.

(See Figure 3)

a. Jumper R to W/W1 and W2 thermostat connections

on furnace control. This keeps furnace locked in

high−heat operation. b. Remove regulator adjustment cap from high−heat

gas valve pressure regulator (See Figure 3) and turn

high heat adjusting screw (3/16−in. or smaller

PERCENT

OF DERATE

0 1.00

4−6 0.95

6−8 0.93

8−10 0.91

10−12 0.89

12−14 0.87

14−16 0.85

16−18 0.83

18−20 0.81

DERATE MULTIPLIER

FACTOR*

flat−tipped screwdriver) counterclockwise (out) to decrease input rate or clockwise (in) to increase input rate.

Figure 3

1/2” NPT Inlet

1/8” NPT Inlet Pressure Tap

Redundant Automatic Gas Control Valve (2−Stage)

ON/OFF Switch

Regulator Seal Cap

Regulator Adjustment Regulator Seal Cap under Cap

1/8” NPT Manifold Pressure Tap

1/2” NPT Outlet

A11152

NOTE: DO NOT set high−heat manifold pressure less than

3.2−in. w.c. or more than 3.8 in. w.c. for natural gas. If 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 tap plug to gas valve. e. Remove jumpers R to W/W1 and R to W2.

WARNING

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Re−install manifold pressure tap plug in gas valve to prevent gas leak.

3. Verify natural gas input rate by clocking meter. a. Turn off all other gas appliances and pilots served by

the meter.

b. Move setup switch SW1−2 to ON position. This

keeps furnace locked in low−heat operation. c. Jumper R to W/W1. d. Run furnace for 3 minutes in low−heat operation. e. Measure time (in sec) for gas meter to complete 1

revolution and note reading. The 2 or 5 cubic feet dial

provides a more accurate measurement of gas flow.

f. Refer to Table 2 for cubic ft. of gas per hr.

g. Multiply gas rate cu ft./hr by heating value (Btuh/cu

ft.) to obtain input. If clocked rate does not match

required input from Step 1, increase manifold

pressure to increase input or decrease manifold

pressure to decrease input. Repeat steps b through e

until correct low−heat input is achieved. Re−install

low heat regulator seal cap on gas valve. h. Move setup switch SW1−2 to OFF position and

jumper R to W/W1, and W2. This keeps furnace

locked in high−heat operation. Repeat items d

through g for high−heat operation.

6 440 04 4221 03

Specifications subject to change without notice.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

24-V THERMOSTAT

PL2 – HOT SURFACE IGNITER & INDUCER

MOTOR CONNECTOR

115-VAC (L2) NEUTRAL

CONNECTIONS

115-VAC (L1) LINE

VOLTAGE CONNECTIONS

EAC-1 TERMINAL

(115-VAC 1.0 AMP MAX.)

PL1 – LOW VOLTAGE MAIN

HARNESS CONNECTOR HARNESS CONNECTOR

TRANSFORMER 24-VAC

CONNECTIONS

3-AMP FUSE

STATUS AND COMM

LED LIGHTS

SW1 SETUP

SWITCHES AND

DELAY

MODEL PLUG CONNECTOR

AIR CONDITIONING

(A/C) AIRFLOW

SETUP SWITCHES

COMMUNICATION

CONNECTOR

CONTINUOUS FAN

F) AIRFLOW

SETUP SWITCHES

OUTDOOR

IR TEMP

CONNECTOR

HUMIDIFIER

TERMINAL (24

VAC

0.5 AMP MAX.

FLASH

UPGRADE

CONNECTOR

(FACTORY

ONLY)

SW4 SETUP SOFTWARE

VERSION

PART NUMBER AND DATE CODE WWYY

Figure 4 Example of Variable Speed Furnace Control for ECM Blower Motor

BLOWER OFF-

TERMINALS

SWITCHES

AND ECM BLOWER

L11F062

440 04 4221 03 7

Specifications subject to change without notice.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

Table 2 Gas Rate (CU ft./hr)

SECONDS G

FOR 1 REVOLUTION

10 360 720 1800 50 72 144 360 11 327 655 1636 51 71 141 355 12 300 600 1500 52 69 138 346 13 277 555 1385 53 68 136 340 14 257 514 1286 54 67 133 333 15 240 480 1200 55 65 131 327 16 225 450 1125 56 64 129 321 17 212 424 1059 57 63 126 316 18 200 400 1000 58 62 124 310 19 189 379 947 59 61 122 305 20 180 360 900 60 60 120 300 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 11 6 232 581 82 44 88 220 32 11 3 225 563 84 43 86 214 33 109 218 545 86 42 84 209 34 106 212 529 88 41 82 205 35 103 206 514 90 40 80 200 36 100 200 500 92 39 78 196 37 97 195 486 94 38 76 192 38 95 189 474 96 38 75 188 39 92 185 462 98 37 74 184 40 90 180 450 100 36 72 180 41 88 176 439 102 35 71 178 42 86 172 429 104 35 69 173 43 84 167 419 106 34 68 170 44 82 164 409 108 33 67 167 45 80 160 400 110 33 65 164 46 78 157 391 112 32 64 161 47 76 153 383 116 31 62 155 48 75 150 375 120 30 60 150 49 73 147 367

SIZE OF TEST DIAL

1 Cu Ft. 2 Cu Ft. 5 Cu Ft. 1 Cu Ft. 2 Cu Ft. 5 Cu Ft.

SECONDS

FOR 1 REVOLUTION

SIZE OF TEST DIAL

8 440 04 4221 03

Specifications subject to change without notice.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

Table 3 Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − Two−Stage

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

ft (m)

092543 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6 42 3.2 / 1.4

(0) 950 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6

to 1000 44 3.5 / 1.5 44 3.6 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4

U.S.A. and CanadaU.S.A. On

y U.S.A. Only U.S.A. and Canada

U.S.A. On

2000 1050 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5

(610) 1075 45 3.7 / 1.6 45 3.8 / 1.6 44 3.3 / 1.4 44 3.4 / 1.4

U.S.A. 800 42 3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5 42 3.7 / 1.6

2001 (611) 825 43 3.8 / 1.6 42 3.3 / 1.4 42 3.4 / 1.4 42 3.5 / 1.5

to 850 43 3.6 / 1.5 43 3.7 / 1.6 42 3.2 / 1.3 42 3.3 / 1.4

3000 (914) 875 43 3.4 / 1.4 43 3.5 / 1.5 43 3.7 / 1.5 43 3.8 / 1.6

Canada 925 44 3.5 / 1.5 44 3.6 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4

2001 (611) 950 44 3.3 / 1.4 44 3.4 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6

to 975 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5

4500 (1372) 1000 46 3.8 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4

3001 800 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4 42 3.4 / 1.4

(915) 825 43 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6 42 3.2 / 1.4

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

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 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6

5000 875 44 3.3 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6

(1524) 900 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5

5001 750 43 3.7 / 1.5 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4

(1525) 775 43 3.4 / 1.4 43 3.5 / 1.5 43 3.7 / 1.5 43 3.8 / 1.6

6000 850 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5

(1829) 875 45 3.7 / 1.6 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4

6001 700 42 3.2 / 1.3 42 3.3 / 1.4 42 3.4 / 1.4 42 3.5 / 1.5

(1830) 725 43 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6 42 3.3 / 1.4

7000 800 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6

(2133) 825 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5

HEATVALUE0.580.600.620.64

AT ALTITUDE Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press

(Btu/cu ft) No. High/Low No. High/Low No. High/Low No. High/Low

900 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4 42 3.4 / 1.4

975 44 3.7 / 1.6 44 3.8 / 1.6 43 3.4 / 1.5 43 3.6 / 1.5

1025 44 3.3 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6

1100 46 3.7 / 1.6 46 3.8 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4

900 44 3.7 / 1.6 44 3.8 / 1.6 43 3.5 / 1.5 43 3.6 / 1.5

775 42 3.3 / 1.4 42 3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5

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

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

825 44 3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5

850 44 3.5 / 1.5 44 3.7 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4

925 46 3.8 / 1.6 45 3.7 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4

725 42 3.2 / 1.4 42 3.3 / 1.4 42 3.4 / 1.5 42 3.5 / 1.5

800 44 3.7 / 1.6 44 3.8 / 1.6 43 3.4 / 1.5 43 3.5 / 1.5

825 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6

900 46 3.7 / 1.6 46 3.8 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4

675 42 3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5 42 3.8 / 1.6

750 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6

775 44 3.6 / 1.5 44 3.7 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5

850 46 3.8 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4

SAGLARUTANFOYTIVARGCIFICEPSSAG.GVA

A11252A

440 04 4221 03 9

Specifications subject to change without notice.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

Table 3 (Cont.) Orifice Size and Manifold Pressure (in. w.c.) for Gas Input Rate − Two−Stage

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

ft (m)

7001 675 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4 42 3.4 / 1.5

(2134) 700 43 3.5 / 1.5 43 3.7 / 1.5 43 3.8 / 1.6 42 3.2 / 1.4

8000 775 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5 44 3.7 / 1.5

(2438) 800 45 3.8 / 1.6 44 3.2 / 1.4 44 3.3 / 1.4 44 3.4 / 1.4

8001 650 43 3.8 / 1.6 42 3.2 / 1.4 42 3.3 / 1.4 42 3.4 / 1.4

(2439) 675 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6 42 3.2 / 1.3

U.S.A. OnlyU.S.A. Only U.S.A. Only

* Orifice numbers shown in BOLD are factory-installed.

9000 750 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5 44 3.6 / 1.5

(2743) 775 45 3.7 / 1.6 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4

9001 600 42 3.3 / 1.4 42 3.4 / 1.5 42 3.6 / 1.5 42 3.7 / 1.6

(2744) 625 43 3.7 / 1.6 42 3.2 / 1.3 42 3.3 / 1.4 42 3.4 / 1.4

10000 700 44 3.4 / 1.4 44 3.5 / 1.5 44 3.7 / 1.5 44 3.8 / 1.6

(3048) 725 44 3.2 / 1.3 44 3.3 / 1.4 44 3.4 / 1.4 44 3.5 / 1.5

HEATVALUE0.580.600.620.64

AT ALTITUDE Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press Orifice Mnfld Press

(Btu/cu ft) No. High/Low No. High/Low No. High/Low No. High/Low

650 42 3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5 42 3.7 / 1.6

725 44 3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5

750 44 3.5 / 1.5 44 3.7 / 1.5 44 3.8 / 1.6 43 3.4 / 1.4

825 46 3.7 / 1.6 46 3.8 / 1.6 45 3.8 / 1.6 44 3.2 / 1.4

625 42 3.4 / 1.4 42 3.5 / 1.5 42 3.6 / 1.5 42 3.7 / 1.6

700 44 3.7 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5 43 3.6 / 1.5

725 44 3.5 / 1.5 44 3.6 / 1.5 44 3.7 / 1.6 44 3.8 / 1.6

650 43 3.5 / 1.5 43 3.6 / 1.5 43 3.7 / 1.6 43 3.8 / 1.6

675 44 3.7 / 1.6 44 3.8 / 1.6 43 3.4 / 1.4 43 3.5 / 1.5

SAGLARUTANFOYTIVARGCIFICEPSSAG.GVA

A11252B

Adjust Temperature Rise

NOTE: Blower door must be installed when taking temperature

rise reading. Leaving blower door off will result in incorrect temperature measurements.

NOTE: Temperature rise can be determined for low−heat operation by placing setup switch SW1−2 on furnace control in ON position. For high−heat operation, place setup switch SW1−2 in OFF position and jumper R−W2 on furnace control. DO NOT forget to return setup switch to OFF position and remove R−W2 jumper upon completion of testing.

CAUTION

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.

When setup switch SW1−4 is ON, operation will be near the high end of the rise range for improved comfort.

Furnace must operate within ranges of temperature rise specified on the furnace rating plate. Determine air temperature rise as follows:

a. Place thermometers in return and supply ducts as

near furnace as possible. Be sure thermometers do not see heat exchanger so that radiant heat does not affect readings. This practice is particularly important with straight−run ducts.

b. When thermometer readings stabilize, subtract

return−air temperature from supply−air temperature to determine air temperature rise.

10 440 04 4221 03

Specifications subject to change without notice.

c. This furnace is capable of automatically providing

proper airflow to maintain the temperature rise within

the range specified on furnace rating plate. If

temperature rise is outside this range, proceed as

follows:

(1.) Check gas input for low− and high−heat

operation. (2.) Check derate for altitude if applicable. (3.) Check all return and supply ducts for excessive

restrictions causing static pressure greater than

0.5−in. w.c.

(4.) Ensure Low Heat Rise Adjust switch SW1−3 on

furnace control is in ON position when a bypass

humidifier is used. (See Figure 4 for switch

location.) (5.) Make sure proper model plug is installed.

d. Remove thermostat jumpers and release blower door

switch.

e. Repeat Steps a through c as required to adjust for

high heat temperature rise.

f. When correct high heat input rate and temperature

rise is achieved, turn gas valve ON/OFF switch to

OFF. g. Release blower door switch. h. Remove manometer or similar device from gas valve.

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVT

i. Re−install manifold pressure tap plug in gas valve.

(See Figure 3)

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Reinstall manifold pressure tap plug in gas valve to prevent gas leak.

j. Remove thermostat jumper wire from furnace control

board.

k. Turn gas valve ON/OFF switch to ON.

FURNACE OVERHEATING HAZARD

Failure to follow this caution may result in reduced furnace life.

Recheck temperature rise. It must be within limits specified on the rating plate. Recommended operation is at the mid−point of rise range or slightly above.

l. Proceed to “Set Blower Off Delay” before installing

blower door.

WARNING

CAUTION

Adjust Blower Off Delay (Heat Mode)

a. Remove blower door if installed.

b. Turn Dip switch SW−7 or SW−8 ON or OFF for

desired blower off delay. (See Table 4 and Figure 4,

Figure 5)

Table 4 Blower Speed Taps

DESIRED HEATING MODE

BLOWER OFF DELAY

(SEC.)

90 OFF OFF

120 ON OFF

150 OFF ON

180 ON ON

SETUP SWITCH (SW1-7 and -8)

POSITION

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 Setup Switches and Descriptions. Depending on the model size, the cooling airflow can be adjusted from 1.5 tons to 6 tons of nominal cooling based on 350 CFM ton.

NOTE: 6 ton airflow will truncate at 2200 CFM on applicable models.

The high−speed or single−speed cooling airflow is adjusted by turning setup switches SW2−1, SW2−2 and SW2−3 either ON or OFF. Select the required airflow from Table 5. Table 5 is based on 350 CFM per ton. For other CFM per ton setup switch selections, see Figure 4, Figure 5 and Figure 16.

The Continuous Fan airflow selection via setup switches SW3 is also the airflow for low−speed cooling when the furnace is used with a two−speed cooling or heat pump unit. Adjust the Continuous Fan CFM setup switches SW3 to match the airflow required for low−speed cooling. Select the required airflow from

Table 5 and Figure 5. NOTE: The airflow selected via SW3 (low−speed cooling

airflow) cannot exceed the airflow selected via SW2 (high−speed cooling airflow). For other CFM per ton setup switch selections, see Figure 4 and Figure 5.

NOTE: The airflow settings for SW2 and SW3 airflow selections are the same for furnaces rated at 1400 CFM of airflow. See Figure 5 − Furnace setup Switches and Descriptions and a range of airflows for low−speed or high−speed cooling. See Table 5 − Air Delivery − CFM (with Filter). The SW3 airflow selections for furnaces rated at 2000 CFM and above can be found in Figure 5.

For a complete explanation of cooling airflow, refer to the section titled “Sequence of Operation.”

Adjust Continuous Fan Airflow/Low Speed Cooling Airflow

NOTE: When the furnace is used with a two−speed cooling or

heat pump unit, the airflow selected for Continuous Fan via setup switch SW3 will also be the airflow used for low−speed cooling, and vice versa. The Continuous Fan speed can be further adjusted at a conventional thermostat using the Continuous Fan speed select function. Changing the Continuous Fan speed at a conventional thermostat DOES NOT change the low−speed cooling airflow selected via SW3 at the control board.

NOTE: When the furnace is used with a two−speed cooling or heat pump unit, adjust the Continuous Fan CFM setup switches SW3 to match the airflow required for low−speed cooling.

Select the required Continuous Fan airflow using setup switches SW3 as shown in Figure 5 and Table 5.

440 04 4221 03 11

Specifications subject to change without notice.

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