Lennox G32V SERIES Service manual

G32V FURNACE
G32V HEAT EXCHANGE ASSEMBLY
Combustion Process:
1. A call for heat starts the combustion air blower.
2. Outdoor air is drawn through pipe into the burner
compartment where it mixes with gas in a con-
ventional style inshot burner.
3. The SureLight ignition system lights the burners.
4. Combustion products are drawn downward
through the heat exchanger. Heat is extracted
as indoor air passes across the outside surface
of the metal.
5. Latent heat is removed from the combustion
products as air passes through the coil. Conden-
sate (water) is formed as the combustion prod-
ucts cool.
6. As the combustion products exit the coil, con-
densate is collected and drained away.
7. Combustion products are pulled from the heat
exchanger and forced into the flue.
Page 1 ©1998 Lennox Industries Inc.
Litho U.S.A.
Corp. 9816−L10
G32V
Service Literature Revised 02−2004
G32V SERIES UNITS
G32V series units are high−efficiency upflow gas furnaces manufactured with
DuralokPlusaluminized steel clamshell-type heat exchangers. G32V units
are available in heating capacities of 75,000 to 125,000 Btuh and cooling ap-
plications up to 5 tons. Refer to Engineering Handbook for proper sizing.
Units are factory equipped for use with natural gas. LP kits are available. All
G32V−1 through −4 units feature the Lennox SureLight silicon nitride ignition
system. G32V−5 and later units feature the two stage variable speed SureLight
integrated control board.The G32V units meet the California Nitrogen Oxides
(NOx) Standards and California Seasonal Efficiency requirements without mod-
ification. All units use a two−stage gas valve along with a two−stage combustion
air blower. The gas valve is redundant to assure safety shut−off as required by
A.G.A. or C.G.A.
All G32V units are equipped with an electronic variable speed (VSM) fan mo-
tor. The VSM consists of an ICM2 motor and control module assembly. The
VSM maintains a specified air volume throughout the entire external static
range.
Information contained in this manual is intended for use by qualified service
technicians only. All specifications are subject to change. Procedures outlined
in this manual are presented as a recommendation only and do not supersede
or replace local or state codes. In the absence of local or state codes, the
guidelines and procedures outlined in this manual (except where noted) are
recommended only.

Page 2
TABLE OF CONTENTS
Specifications 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting Table 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components 10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Box 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SureLight Ignition System 11. . . . . . . . . . . . . . . . . . .
Two−Stage Ignition Control 13. . . . . . . . . . . . . . . . . .
VSP2−1 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VSP3−1 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SureLight Two Stage Variable Speed Control 22.
Blower Compartment 30. . . . . . . . . . . . . . . . . . . . . . .
Heating 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Placement and Installation 38. . . . . . . . . . . . . . . . . . . .
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person-
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
III Start Up 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Heating System Service Checks 47. . . . . . . . . . . . . .
V Typical Operating Characteristics 49. . . . . . . . . . . . . .
VI Maintenance 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII Wiring Diagrams and Operating Sequence 53. . . .
G32V−1 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G32V−3 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G32V−4 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G32V−5 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VSP2−1 Jumper Summary 70. . . . . . . . . . . . . . . . . .
VSP3−1 Jumper Summary 74. . . . . . . . . . . . . . . . . .
SureLight Jumper Summary 78. . . . . . . . . . . . . . . .
VIII Troubleshooting 81. . . . . . . . . . . . . . . . . . . . . . . . . . .
VSP2−1 Board 81. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VSP3−1 Board 82. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ICM2 Motor with VSP2−1 83. . . . . . . . . . . . . . . . . . .
ICM2 Motor with VSP3−1 84. . . . . . . . . . . . . . . . . . .
ICM2 Motor with SureLight Control 85. . . . . . . . . . .
SureLight Control 86. . . . . . . . . . . . . . . . . . . . . . . . .
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at discon-
nect switch(es). Unit may have multiple
power supplies.

Page 3
SPECIFICATIONS
Model No. G32V3−75 G32V5−100 G32V5−125
Input Btuh (kW) − High 75,000 (22.0) 100,000 (29.3) 125,000 (36.6)
Input Btuh (kW) − Low 51,000 (14.9) 68,000 (19.9) 85,000 (24.9)
Output Btuh (kW) − High 67,500 (19.8) 90,000 (26.4) 112,500 (32.9)
Output Btuh (kW) − Low 45,900 (13.4) 61,200 (17.9) 76,500 (22.4)
A.F.U.E. 92.7% 93.2% 94.2%
California Seasonal Efficiency 89.4% 90.1% 91.1%
Exhaust pipe connection (PVC) diameter in. (mm) 2 (51)
Intake pipe connection (PVC) diameter in. (mm) 2 (51) 3 (76)
Condensate drain connection (PVC) in. (mm) 1/2 (12.7)
Temperature rise range

F(

C)
Low Fire 30 − 60(16 − 33) 35 − 65 (19 − 36)
Temperature rise range  F (C) High Fire 40 − 70 (22 − 39) 50 − 80 (28 − 44)
High static certified by (A.G.A./C.G.A.)  in. wg. (Pa) .80 (200)
Gas Piping Size I.P.S. − Natural − in. (mm) 1/2 (12.7)
Blower wheel nominal diameter x width − in. (mm) 10 x 8 (254 x 203) 11−1/2 x 9 (292 x 229)
Blower motor output  hp (W) 1/2 1
Nominal cooling that can be added − Tons (kW) 2 to 3 (7 to 10.6) 3−1/2 to 5 (12.3 to 17.6)
No. & size of filters − in. (mm) (1) 14 x 25 x 1 (356 x 635 x 25) (1) 20 x 25 x 1 (508 x 635 x 25)
Shipping weight  lbs. (kg) 1 package 161 (73) 201 (91) 221 (100)
Electrical characteristics 120 volts  60 hertz  1 phase (less than 12 amps)
OPTIONAL ACCESSORIES (Must Be Ordered Extra)
Concentric Vent/Intake Air/Roof Termination Kit 60G77  1/1/2 inch (38 mm) 33K97  2 inch
(51 mm)
33K97− 2 inch (51 mm)
60L46 − 3 inch (76 mm)
Vent/Intake Air Roof 2 inch (51 mm) 15F75
Vent/Intake
Air
Roof
Termination Kit  vent size 3 inch (76 mm) 44J41
Vent/Intake Air Wall
Termination Kit vent size
2 inch (51 mm) 15F74 (ring kit)  22G44 (close couple) 30G28 (WTK close couple)
30G79 (WTKX close couple with extension riser)
Termination Kit  vent size 3 inch (76 mm) 44J40 (close couple)  81J20 (WTK close couple)
Condensate Drain Heat Cable 26K68 6 ft. (1.8 m) − 26K69 24 ft. (7.3 m) − 26K70 50 ft. (15.2 m)
Heat Cable Tape
Fiberglass − 1/2 in. (38 mm) 39G04
Heat Cable Tape Aluminum foil − 2 in. (25 mm) 39G03
L.P. Kit 34L29 (−1, −2 models) 11M55 (−3 and later models)
Annual Fuel Utilization Efficiency based on U.S. DOE test procedures and FTC labeling regulations. Isolated combustion system rating for non−weatherized furnaces.
Meets California Nitrogen Oxides (NOx) Standard and California Seasonal Efficiency requirements.
Determine from venting tables proper intake and exhaust pipe size and termination kit required.
Polyurethane frame type filter.
NOTE − 2 inch x 3 inch (51 mm x 76 mm) adaptor is furnished with −100 and −125 furnaces for exhaust pipe connection.

Page 4
BLOWER PERFORMANCE
Table 1
G32V3−75−1 through −3 Units
0 THROUGH 0.80 IN. W.G. (0 THROUGH 200 PA) EXTERNAL STATIC PRESSURE
VSP2-1 Blower Control Low Speed  3
Factory Settings High Speed  4
Heat Speed  3
VSP2−1 Jumper Speed Positions
ADJUST"
Jumper
LOW" Speed
(Cool, Low Heat Or Continuous Fan) HIGH" Speed (Cool) HEAT" Speed
Jumper
Setting 1 2 3 4 1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
NORM 880 415 930 440 980 465 1040 490 1060 500 1105 520 1260 595 1330 630 1075 510 1150 545 1270 600 1350 635
− 15% 775 365 810 380 850 400 910 430 930 440 970 460 1070 505 1130 535 930 440 990 465 1080 510 1140 540
NOTE  The effect of static pressure and filter resistance is included in the air volumes listed.
Table 2
G32V5−100/125−1 through −3 Units
0 THROUGH 0.80 IN. W.G. (0 THROUGH 200 PA) EXTERNAL STATIC PRESSURE
VSP2-1 Blower Control G32V5−100 G32V5−125
Factory Settings Low Speed  2 Low Speed  3
High Speed  4 High Speed  4
Heat Speed  1 Heat Speed  2
VSP2 Jumper Speed Positions
ADJUST"
Jumper
LOW" Speed (Cool Or Continuous Fan) HIGH" Speed (Cool) HEAT" Speed
Jumper
Settin
g
12 3 4 1 2 3 4 1 2 3 4
Setting
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
NORM 1140 540 1250 590 1440 680 1550 730 1620 765 1820 860 2000 945 2100 990 1560 735 1720 810 2030 960 2150 1015
−970 460 1060 500 1280 605 1320 625 1380 650 1550 730 1700 800 1780 840 1330 630 1460 690 1730 815 1830 865
NOTE  The effect of static pressure and filter resistance is included in the air volumes listed.
G32V5−125 unit only − do not place jumper on tap 1 ("") for high speed or tap 2 ("NORM" or "") for low speed.
Table 3
G32V3−75−4 Units
0 THROUGH 0.80 IN. W.G. (0 THROUGH 200 PA) EXTERNAL STATIC PRESSURE
VSP3−1 Blower Control Factory Settings ADJUST − NORM
Heat Speed − 3
Cool Speed − 4
VSP Jumper Speed Positions

ADJUST
"HEAT" Jumper
ADJUST"
Jumper
P iti
Low Speed High Speed
Jumper
Positions 1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
NORM (Normal) 880 415 930 440 980 465 1040 490 1075 510 1150 545 1270 600 1350 635
" (Minus) 15% 775 365 810 380 850 400 910 430 930 440 990 460 1080 510 1140 540
COOL" Jumper
ADJUST"
Jumper
Low Speed High Speed
Jumper
Positions 1 2 3 4 1 2 3 4
Positions
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
NORM (Normal) 880 415 930 440 980 465 1040 490 1060 500 1105 520 1260 600 1350 635
" (Minus) 15% 775 365 810 380 850 400 910 430 930 440 970 460 1080 510 1140 540
15% lower motor speed than NORM jumper setting.
NOTE − The effect of static pressure and filter resistance is included in air volumes shown.
NOTE − Continuous Fan only speed is approximately 800 cfm (380 L/s) − non adjustable.
NOTE − Lennox Harmony IIzone control applications − MAX CFM is determined by COOL jumper placement with a minimum of approximately 850 cfm (400 L/s) for all positions.

Page 5
Table 4
G32V5−100/125−4 Units
0 THROUGH 0.80 IN. W.G. (0 THROUGH 200 PA) EXTERNAL STATIC PRESSURE
VSP3−1 Blower Control Factory Settings G32V5−100 ADJUST − NORM G32V5−125 ADJUST −  (minus)
Heat Speed − 2 Heat Speed − 4
Cool Speed − 4 Cool Speed − 4
VSP Jumper Speed Positions

ADJUST
"HEAT" Jumper
ADJUST"
Jumper
P iti
Low Speed High Speed
Jumper
Positions 12 3 4 12 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
NORM (Normal) 1140 540 1250 590 1440 680 1550 730 1560 735 1720 810 2030 955 2150 1015
" (Minus) 15% 970 455 1060 500 1280 605 1320 595 1330 625 1460 690 1730 815 1830 865
COOL" Jumper
ADJUST"
Jumper
Low Speed High Speed
Jumper
Positions 1 2 3 4 1 2 3 4
Positions
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
NORM (Normal) 1140 540 1250 590 1440 680 1550 730 1620 765 1820 860 2000 945 2100 990
" (Minus) 15% 970 455 1060 500 1280 605 1320 595 1380 650 1550 730 1700 800 1780 840
15% lower motor speed than NORM jumper setting.
G32V5−125 Models Only − Do not place jumper on position #1 (at NORM or " setting) or position #2 (at " setting) for HEAT speed.
NOTE − The effect of static pressure and filter resistance is included in air volumes shown.
NOTE − Continuous Fan only speed is approximately 1150 cfm (545 L/s) − non adjustable.
NOTE − Lennox Harmony IIzone control applications − MAX CFM is determined by COOL jumper placement with a minimum of approximately 1140 cfm (540 L/s) for all positions.
TABLE 5
G32V3−75−5 Units BLOWER MOTOR PERFORMANCE
0.0" to 0.8" w.g. (0 through 200 Pa) External Static Pressure Range
Blower Speed Adjustment Settings (Switches 5 and 6)
Cool
Adjust"
Setting
Low Speed High Speed
S
e
tti
ng 1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
Norm 880 415 930 440 980 465 1040 490 1060 500 1105 520 1260 595 1330 630
–775 365 810 380 850 400 910 430 930 440 970 460 1070 505 1130 535
Blower Speed Adjustment Settings (Switches 7 and 8)
Heat
Adjust"
Setting
Low Speed High Speed
Setting 1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
Norm 945 446 1025 484 1125 531 1270 599 1080 510 1172 533 1286 607 1452 685
–803 379 871 411 956 451 1080 510 918 433 996 470 1093 516 1234 582
15% lower motor speed than NORM switch setting.
NOTE − The effect of static pressure and filter resistance is included in air volumes shown.
NOTE − Continuous Fan only speed is approximately 800 cfm (380 L/s) − non adjustable.
NOTE − Lennox Harmony IItzone control applications − MAX CFM is determined by COOL switch setting with a minimum of approximately 850
cfm (400 L/s) for all positions.

Page 6
TABLE 6
G32V5−100/125−5 Units BLOWER MOTOR PERFORMANCE
0.0" to 0.8" w.g. (0 through 200 Pa) External Static Pressure Range
Blower Speed Adjustment Settings (Switches 5 and 6)
Cool
Adjust"
Setting
Low Speed High Speed
S
e
tti
ng 123 4 123 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
Norm 1140 540 1250 590 1440 680 1550 730 1620 765 1820 860 2000 945 2100 990
–970 455 1060 500 1280 605 1320 595 1380 650 1550 730 1700 800 1780 840
Blower Speed Adjustment Settings (Switches 7 and 8)
Heat
Adjust"
Setting
Low Speed High Speed
Setting 1 2 3 4 1 2 3 4
cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s
Norm 1140 540 1250 590 1440 680 1550 730 1560 735 1720 810 2030 960 2150 1015
–970 455 1060 500 1280 605 1320 595 1330 660 1460 690 1730 815 1830 865
15% lower motor speed than NORM switch setting.
G32V5−125 Models Only − Do not set switches for position #1 (at NORM or –" setting) or position #2 (at −" setting) for HEAT speed.
NOTE − The effect of static pressure and filter resistance is included in air volumes shown.
NOTE − Continuous Fan only speed is approximately 1150 cfm (545 L/s) − non adjustable.
NOTE − Lennox Harmony IItzone control applications − MAX CFM is determined by COOL switch setting with a minimum of approximately 1140
cfm (540 L/s) for all positions.
FILTER AIR RESISTANCE
cfm (L/s) in. w.g. (Pa)
0 (0) 0.00 (0)
200 (95) 0.01 (0)
400 (190) 0.03 (5)
600 (285) 0.04 (10)
800 (380) 0.06 (15)
1000 (470) 0.09 (20)
1200 (565) 0.12 (30)
1400 (660) 0.15 (35)
1600 (755) 0.19 (45)
1800 (850) 0.23 (55)
2000 (945) 0.27 (65)
2200 (1040) 0.33 (80)
2400 (1130) 0.38 (95)
2600 (1225) 0.44 (110)

Page 7
HIGH ALTITUDE INFORMATION
No gas pressure adjustment is needed when operating from 0 to 4500 ft. (0 to 8 m). See below for correct manifold pressures for altitudes
greater that 4500 ft. (1372 m) for natural and L.P. gas.
Manifold Absolute Pressure (outlet) in. w.g. (kPa)
Model No. 0 to 4500 ft. (0 to 1372 m)
above sea level
4501 to 5500 ft.
(1373 to 1676 m)
above sea level
5501 to 6500 ft.
(1677 to 1981 m)
above sea level
6501 to 7500 ft.
(1982 to 2286 m)
above sea level
G32V−75 natural no adjustment
G32V−100 natural
35(088)
34(085)
33(082)
32(080)
G32V−125 natural 3.5 (0.88) 3.4 (0.85) 3.3 (0.82) 3.2 (0.80)
G32V−75 L.P. no adjustment
G32V−100 L.P. 7.5 (0.19) 7.3 (0.185) 7.1 (0.180) 7.0 (0.177)
G32V−125 L.P. 7.5 (0.19) 7.3 (0.185) 7.1 (0.180) 7.0 (0.177)
INTAKE AND EXHAUST PIPE VENTING TABLE
Vent Pipe
Maximum
Minimum Vent Pipe Diameter Required
Maximum
Equivalent Length 75,000 Btuh (22.0 kW) 100,000 Btuh (29.3 kW) 125,000 Btuh (36.6 kW)
Feet Meters in. mm in. mm in. mm
15 4.6 2 51 2 51 2 51
20 6.1 2 51 2 51 3 76
25 7.6 2 51 2 51 3 76
30 9.1 2 51 3 51 3 76
40 12.2 2 51 3 51 3 76
50 15.2 2 51 3 51 3 76
55 16.8 2 51 3 76 3 76
60 18.3 3 76 3 76 3 76
70 21.3 3 76 3 76 3 76
80 24.4 3 76 3 76 3 76
90 27.4 3 76 3 76 3 76
100 30.5 3 76 3 76 3 76
110 33.5 3 76 3 76 3 76
120 36.6 3 76 3 76 3 76
130 39.6 3 76 3 76 − − − − − − − −
MINIMUM PIPE LENGTHS FOR FURNACES  G32V−75  5 feet (1.5 m) with two 90elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G32V−100  5 feet (1.5 m) with two 90elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
G32V−125  5 feet (1.5 m) with two 90elbows of 2 inch (51 mm) diameter pipe. (15 equivalent feet (4.6 m) total).
VENTING NOTES  One 90elbow is equivalent to 5 feet (1.5 m) of straight vent pipe.
Two 45elbows are equal to one 90elbow.
One 45elbow is equivalent to 2.5 feet (.75 m) of straight vent pipe.
One foot (305 mm) length of 2 in. (51 mm) diameter pipe is equivalent to 8 feet (2.4 m) of 3 in. (76 mm) diameter pipe.
Intake and Exhaust pipes must be the same diameter.
2 inch x 3 inch (51 mm x 76 mm) adaptor is furnished with −100 and −125 furnaces for exhaust pipe connection.
Exhaust pipe must terminate with 1−1/2 inch (38 mm) diameter pipe for furnaces using1−1/2 (38 mm) or 2 inch (51 mm) diameter pipe runs.
Exhaust pipe must terminate with 2 inch (51 mm) diameter pipe for furnaces using 3 inch (76 mm) diameter pipe runs.

Page 8
TOP CAP
CABINET
GLASS FIBER GASKET
FRESH AIR
INTAKE FITTING
BURNER BOX
ASSEMBLY
PATCH
PLATE
PATCH PLATE WITH
BARBED FITTING
AND FLAME
ROLL−OUT SWITCH
TWO-STAGE
GAS VALVE AND
MANIFOLD
BURNER
BOX
COVER
FLAME SIGHT
GLASS
DuralokPlusTM
HEAT EXCHANGER
ASSEMBLY
CONTROL VOLTAGE
CIRCUIT BREAKER
WARM
HEADER
(COLLECTOR)
BOX
COLD HEADER
(COLLECTOR)
BOX
TWO−SPEED
COMBUSTION AIR
INDUCER
COMBUSTION
AIR
ORIFICE
BLOWER
ACCESS
DOOR
BURNER
ACCESS
PANEL
FLUE
TRANSITION
LOW HEAT
DIFFERENTIAL
PRESSURE
SWITCH
SUPPLY
AIR
BLOWER
PRIMARY LIMIT
(ALTERNATE STYLES)
FLUE COLLAR
DOOR INTERLOCK SWITCH
HIGH HEAT
DIFFERENTIAL
PRESSURE
SWITCH
(−75 only)
SURELIGHT TWO−STAGE,
VARIABLE−SPEED
INTEGRATED CONTROL BOARD
SECONDARY COIL
TRANSFORMER
G32V PARTS ARRANGEMENT
FIGURE 1

Page 9
FIGURE 2
G32V HEAT EXCHANGER
BURNER
ACCESS
COVER
BURNER BOX
FRESH AIR INTAKE
FITTING CORBEL ORIFICE
CUPS
SURELIGHT IGNITOR LENNOX DURALOKPLUS
HEAT EXCHANGER ASSEMBLY
WARM HEADER
(COLLECTOR)
BOX
CONDENSER COIL
COLD HEADER
(COLLECTOR )
BOX
COMBUSTION AIR
BLOWER MOTOR
COMBUSTION
AIR BLOWER
GAS VALVE
MANIFOLD
FIGURE 3
G32V GENERAL PARTS ORIENTATION
HIGH HEAT DIFFERENTIAL
PRESSURE SWITCH
(G32V−75 ONLY)
CONTROL BOX
COMBUSTION AIR BLOWER
COIL CHOKE
COLD HEADER BOX
FLAME SIGHT GLASS
GAS MANIFOLD
SUPPLY AIR DUCT FLANGE
UPPER VEST PANEL
PRIMARY LIMIT
GAS VALVE
HEADER BOX
CONDENSATE
TRAP
LOWER VEST PANEL
BLOWER MOTOR
BURNER BOX
BLOWER HOUSING
BLOWER
COMPARTMENT
CIRCUIT BREAKER
DOOR INTERLOCK SWITCH
FLUE TRANSITION
TWO−STAGE CONTROL*
LOW HEAT DIFFERENTIAL
PRESSURE SWITCH
SURELIGHT CONTROL BOARD*
VSP BLOWER CONTROL BOARD*
*NOTE−G32V−1 through −4 units only

BLACK
WHITE
NEUTRAL
BROWN
J69
INSTALLING BROWN
ACCESSORY WIRE TO J69
FIGURE 6
Page 10
FIGURE 4
MAKE-UP BOX INSTALLATION
MAKE-UP BOX
MAKE-UP BOX
UNIT
CABINET
Box may be installed inside or outside cabinet and
may be installed on left side or right side of cabinet
JACK J69
PLUG P69
BLOWER MULLION
BLOWER MULLION
OUTSIDE INSTALLATION INSIDE INSTALLATION
Line Voltage Enters Make-Up
Box Through Side Of Unit and
J69 Passes Through Bottom
Knockout in Make-Up Box.
Line Voltage Enters Through
Knockout In Make-Up Box.
J69 Passes Through Side
Knockout Into Side Of Unit.
STAR WASHERS
MUST BREAK
PAINT ON UNIT
CABINET FOR
PROPER GROUND.
I−UNIT COMPONENTS
G32V unit components are shown in figures 1 and 2. General
parts orientation is shown in figure 3. The gas valve, ignition
control and burners can be accessed by removing the burner
access panel. The blower and blower controls can be ac-
cessed by removing the blower access door.
G32V units are designed for bottom and side return air. The
panels are designed to be knocked-out (bottom return) or
cut-out (side return) as required for return air duct connec-
tion.
A−Make-Up Box (Figure 5)
The line voltage make-up box is shown in figure 5. The box
may be installed inside or outside the unit and may be installed
on the unit left or right side (figure 4).
FIGURE 5
MAKE-UP BOX
BOX
COVER
JACK J69
to blower deck TO BLOWER MULLION
POWER ENTRY KNOCKOUT
120V LINE VOLTAGE
PIGTAIL CONNECTIONS
UNIT
GROUND
Box may be installed inside or outside unit. See Figure 4.
An accessory (brown) output wire is provided with the make-up
box. The wire provides a 120V connection for optional acces-
sories such as electronic air cleaner or humidifier. If used, the
wire is field installed in J69 jack plug by inserting the pin of the
brown wire into the open socket
of the jack. See figure 6. 120V
accessories rated up to 4 amps
total may be connected to this
wire. The neutral leg of the ac-
cessory is connected to the
neutral white wire in the make-
up box. The accessory terminal
is energized whenever the
blower is in operation.
B−Control Box Components
G32V−1 through −4 CONTROL BOX
FIGURE 7
CIRCUIT
BREAKER
DOOR
INTERLOCK
SWITCH
TRANSFORMER
SURELIGHT
CONTROL
TWO−
STAGE
CONTROL
BOARD
VSP
BOARD TERMINAL STRIP