Service Literature
CBX32MV (HFC−410A) SERIES UNITS
TABLE OF CONTENTS
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification.. 2. . . . . . . . . . . . . . . . . . .
Specifications / Electrical Data 2. . . . . . . . . . . . . . . . . .
Blower Performance 4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
I− Application 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II− Unit Components 11. . . . . . . . . . . . . . . . . . . . . . . . . . .
III− Troubleshooting the Variable Speed Motor 15. . . . .
IV− Optional Electric Heat 17. . . . . . . . . . . . . . . . . . . . . . .
V− Optional Humidity Control 23. . . . . . . . . . . . . . . . . . . .
VI− Configuration Modifications 30. . . . . . . . . . . . . . . . . .
VII− Start Up Operation 34. . . . . . . . . . . . . . . . . . . . . . . . .
VIII− Operating Characteristics 35. . . . . . . . . . . . . . . . . .
XI− Maintenance 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
X− Wiring and Operation Sequence 36. . . . . . . . . . . . . .
Corp. 0206−L3
Revised 02−2010
CBX32MV
Introduction
The CBX32MV is a high efficiency residential split system
blower/coil featuring a variable speed motor controlled by an
electronic blower drive control (BDC).
CBX32MV series units are designed to be matched with
Lennox two-speed or single-speed HFC−410A condensing
units and heat pumps. Several models are available in sizes
ranging from 1.5 through 5 tons. All units are equipped with
factory installed check and expansion valve for cooling or heat
pump applications.
Electric heat is available in several voltages and KW sizes,
and can be field installed in the cabinet.
Some CBX32MV applications may include the optional
Lennox ComfortSense
Efficiency Plus Comfort Management Control (CCB1). The
purpose of both controls is to vary indoor blower speed in
response to indoor dehumidification demand. When a
two-speed outdoor unit is used, compressor speed can
also be controlled by the SignatureStat or CCB1 in
response to indoor dehumidification demand.
Information contained in this manual is intended for use by
experienced HVAC 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.
®
7000, SignatureStatt or
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 disconnect switch(es). Unit may have multiple
power supplies.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit installation and service to protect the unit’s electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
Page 1
2002 Lennox Industries Inc.
Model Number Identification
Unit Type
CB = Air Handler
Refrigerant Type
X = R−410A
Series
Configuration
MV = Multi−Position, Variable
speed blower motor
Nominal Cooling Capacity
018/024 = 1.5 to 2 tons (5.3 to 7 kW)
024/030 = 2 to 2.5 tons (7 to 8.8 kW)
036 = 3 tons (10.6 kW)
048 = 4 tons (14.1 kW)
060 = 5 tons (17.6 kW)
068 = 5+ tons (17.6+ kW)
X
MV
−
−
230CB 32 036
−−
05
6
Minor Revision Number
Refrigerant Metering Device
2 = Fixed Orifice
3 = TXV − Bleedport (indoor unit)
4 = TXV − Non−bleedport (indoor unit)
5 = TXV − Non−bleedport (outdoor unit)
6 = TXV − R−410A Non−bleedport (indoor unit)
Voltage
230 = 208/230V−60hz−1ph
Specifications
General Data Model Number CBX32MV-018/024 CBX32MV-024/030 CBX32MV-036
Connections
in. (mm)
Nominal cooling capacity − tons (kW)
Refrigerant
Suction (vapor) line − sweat
Liquid line − sweat
1.5 − 2 (5.3 − 7) 2 − 2.5 (7 − 8.8) 3 (10.6)
R−410A R−410A R−410A
5/8 (15.8) 3/4 (19) 3/4 (19)
3/8 (9.5) 3/8 (9.5) 3/8 (9.5)
Condensate drain (fpt)
Indoor
Coil
Blower Data
Filters
Shipping Data − 1 Package lbs. (kg) 126 (57) 152 (69) 183 (83)
ELECTRICAL DATA
Voltage − phase − 60hz 208/230V−1ph
2
Maximum overcurrent protection (unit only) 15 15 15
Minimum circuit ampacity (unit only) 5 5 5
Tube outside diameter − in. (mm)
Wheel nominal diameter x width − in. (mm)
Net face area − ft.2 (m2)
Number of rows
Fins per inch (fins per m)
Motor output − hp (W)
1
Number and size − in.
mm
(2) 3/4 (19) (2) 3/4 (19) (2) 3/4 (19)
3.56 (0.33) 4.44 (0.41) 5.0 (0.46)
3/8 (9.5) 3/8 (9.5) 3/8 (9.5)
3 3 3
12 (472) 12 (472) 12 (472)
10 x 7 (279 x 178) 10 x 8 (279 x 203) 10 x 8 (279 x 203)
1/2 (373) 1/2 (373) 1/2 (373)
(1) 15 x 20 x 1 (1) 20 x 20 x 1 (1) 20 x 22 x 1
381 x 508 x 25 508 x 508 x 25 508 x 559 x 25
208/230V−1ph 208/230V−1ph
Page 2
Specifications
General Data Model Number CBX32MV-048 CBX32MV-060 CBX32MV-068
Nominal cooling capacity − tons (kW)
4 (14.1) 5 (17.6) 5+ (17.6+)
Connections
in. (mm)
Indoor
Coil
Blower Data
Filters
Refrigerant
Suction (vapor) line − sweat
Liquid line − sweat
Condensate drain (fpt)
Net face area − ft.2 (m2)
Tube outside diameter − in. (mm)
Number of rows
Fins per inch (fins per m)
Wheel nominal diameter x width − in. (mm)
Motor output − hp (W)
1
Number and size − in.
mm
R−410A R−410A R−410A
7/8 (22.2) 1-1/8 (28) 1-1/8 (28)
3/8 (9.5) 3/8 (9.5) 3/8 (9.5)
(2) 3/4 (19) (2) 3/4 (19) (2) 3/4 (19)
7.22 (0.67) 7.22 (0.67) 7.77 (0.72)
3/8 (9.5) 3/8 (9.5) 3/8 (9.5)
3 3 3
12 (472) 12 (472) 12 (472)
12 x 9 (305 x 229) 12 x 9 (305 x 229) 15 x 9 (381 x 229)
1 (746) 1 (746) 1 (746)
(1) 20 x 24 x 1 (1) 20 x 24 x 1 (1) 20 x 25 x 1
508 x 610 x 25 508 x 610 x 25 508 x 635 x 25
Shipping Data − 1 Package − lbs. (kg) 212 (96) 212 (96) 244 (111)
ELECTRICAL DATA
Voltage − phase − 60hz 208/230V−1ph
2
Maximum overcurrent protection (unit only) 20 20 20
208/230V−1ph 208/230V−1ph
Minimum circuit ampacity (unit only) 11 11 11
Optional CIRCUIT BREAKER KITS − Must Be Ordered Extra
Amperage 25 30 35 40 45 50 60
Single Phase 23M58 23M59 23M60 23M61 23M62 23M63 23M64
Three Phase − − − 23M65 − − − 23M66 23M67 23M68 23M69
Page 3
Blower Data
CBX32MV-018/024 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
BDC3 Jumper Speed Positions
ADJUST"
Jumper
Setting
+ 715 337 855 405 1000 470 1130 535 465 220 690 325 900 425 1050 495
NORM 670 315 770 365 900 425 1035 490 425 200 620 290 825 390 950 450
− 580 275 700 330 800 375 930 440 385 180 560 265 735 345 850 400
NOTES − The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
Low speed cooling air volume is 70% of COOL speed setting. Production units September 2005 and later; continuous blower speed for is approximately 38% of
COOL speed setting. Earlier production units continuous blower speed is approximately 50% of COOL speed setting.
Harmony Zone Control applications − Low speed cooling is approximately 250 cfm (118 L/s).
Lennox Harmony IIIt Zone Control applications − Low speed cooling is 300 cfm (145 L/s)
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
CBX32MV-018/024 BLOWER MOTOR WATTS AT +" (Plus) BDC3 SETTING (Adjust" Jumper at +" Setting)
BDC3 Jumper
Speed Positions
HEAT" Speed
COOL" Speed
Tap 1 100 113 126 142 154 172 190 206 230
Tap 2 155 176 197 221 237 260 278 295 310
Tap 3 237 260 289 305 314 337 356 373 390
Tap 4 338 361 379 409 433 457 447 426 406
Tap 1 36 47 61 71 81 95 106 118 135
Tap 2 89 103 11 8 129 143 163 177 197 207
Tap 3 183 198 229 248 266 290 307 327 343
Tap 4 266 294 315 330 349 373 390 411 401
HEAT" Speed COOL" Speed
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
CBX32MV-018/024 BLOWER MOTOR WATTS AT NORM" BDC3 SETTING (Adjust" Jumper at NORM Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
COOL" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 77 96 106 123 130 150 165 178 201
Tap 2 118 136 154 177 189 212 224 247 265
Tap 3 183 198 224 248 264 284 307 321 343
Tap 4 264 284 300 326 343 367 385 406 390
Tap 1 30 41 55 62 76 86 94 106 11 4
Tap 2 71 83 101 11 3 125 138 156 166 185
Tap 3 137 158 176 199 219 238 254 273 296
Tap 4 211 225 249 272 295 318 331 342 367
CBX32MV-018/024 BLOWER MOTOR WATTS AT −" (Minus) BDC3 SETTING (Adjust" Jumper at −" Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 59 73 89 106 113 130 142 156 173
Tap 2 95 106 11 8 136 152 171 183 200 215
Tap 3 132 148 171 186 211 225 248 266 284
Tap 4 195 217 242 259 283 302 314 336 349
COOL" Speed
Tap 1 27 35 47 59 71 77 88 92 106
Tap 2 57 65 83 94 110 119 134 148 166
Tap 3 110 124 141 157 176 188 213 231 242
Tap 4 148 170 195 207 230 248 272 282 306
Page 4
CBX32MV-024/030 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
BDC3 Jumper Speed Positions
ADJUST"
Jumper
Setting
+ 800 380 935 440 1070 505 1210 570 660 310 880 415 1100 520 1320 625
NORM 725 340 850 400 975 460 1100 520 600 285 800 380 1000 470 1200 565
− 655 310 765 360 880 415 990 470 540 255 720 340 900 425 1080 510
NOTES − The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
Low speed cooling air volume is 70% of COOL speed setting. Production units September 2005 and later; continuous blower speed for is approximately 38% of
COOL speed setting. Earlier production units continuous blower speed is approximately 50% of COOL speed setting.
Harmony Zone III Control applications − Low speed cooling is approximately 300 cfm (145 L/s).
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
HEAT" Speed COOL" Speed
CBX32MV-024/030 BLOWER MOTOR WATTS AT +" (Plus) BDC3 SETTING (Adjust" Jumper at +" Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 65 90 120 145 185 210 240 250 275
Tap 2 95 125 150 185 230 265 310 345 365
Tap 3 140 190 225 250 290 320 350 405 450
Tap 4 215 250 285 315 350 390 440 480 505
COOL" Speed
Tap 1 45 60 90 120 140 155 165 185 200
Tap 2 80 110 135 165 205 250 285 315 335
Tap 3 150 195 225 260 295 320 370 425 465
Tap 4 265 315 350 400 440 485 525 555 605
CBX32MV-024/030 BLOWER MOTOR WATTS AT NORM" BDC3 SETTING (Adjust" Jumper at NORM Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
COOL" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 50 75 100 135 155 180 195 215 230
Tap 2 80 105 130 155 200 245 265 295 310
Tap 3 110 150 175 200 235 275 320 350 390
Tap 4 155 205 230 270 290 325 360 405 460
Tap 1 40 55 80 105 120 130 150 165 180
Tap 2 65 90 120 145 190 210 240 260 285
Tap 3 105 145 175 220 250 285 335 370 405
Tap 4 200 245 275 300 335 385 420 470 515
CBX32MV-024/030 BLOWER MOTOR WATTS AT −" (Minus) BDC3 SETTING (Adjust" Jumper at −" Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 45 65 90 110 130 150 165 190 195
COOL" Speed
Tap 2 60 85 110 145 175 200 215 235 240
Tap 3 85 105 130 165 210 245 280 305 330
Tap 4 115 145 175 205 230 280 325 370 390
Tap 1 30 50 70 90 100 115 125 140 165
Tap 2 55 75 100 135 155 185 190 210 225
Tap 3 85 115 135 175 210 255 295 320 345
Tap 4 145 175 215 245 280 325 355 410 450
Page 5
CBX32MV-036 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range
BDC3 Jumper Speed Positions
ADJUST"
Jumper
Setting
+ 1230 580 1335 630 1445 680 1545 730 1090 515 1225 580 1380 650 1545 730
NORM 1120 530 1215 575 1315 620 1400 660 975 460 1125 530 1275 600 1400 660
− 1010 475 1185 560 1200 565 1265 595 900 425 1000 470 1135 535 1265 595
NOTES − The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
Low speed cooling air volume is 70% of COOL speed setting (65% COOL speed for production prior to August 2002). Production units September 2005 and later;
continuous blower speed for is approximately 38% of COOL speed setting. Earlier production units continuous blower speed is approximately 50% of COOL
speed setting.
Harmony Zone Control applications − Low speed cooling is approximately 380 cfm (178 L/s).
Lennox Harmony IIIt Zone Control applications − minimum blower speed is 442 cfm (210 L/s).
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
HEAT" Speed COOL" Speed
CBX32MV-036 BLOWER MOTOR WATTS AT +" (Plus) BDC3 SETTING (Adjust" Jumper at +" Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 220 235 265 290 310 335 360 385 465
Tap 2 285 305 330 355 380 405 430 450 475
Tap 3 345 365 405 430 455 485 515 545 570
Tap 4 470 495 515 530 545 560 575 595 610
COOL" Speed
Tap 1 145 165 200 225 250 275 300 325 350
Tap 2 225 245 265 290 320 350 370 395 410
Tap 3 305 325 350 390 420 445 475 505 535
Tap 4 470 495 515 530 545 560 575 595 610
CBX32MV-036 BLOWER MOTOR WATTS AT NORM" BDC3 SETTING (Adjust" Jumper at NORM Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
COOL" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 155 185 215 240 265 285 300 335 355
Tap 2 225 245 270 295 325 345 370 390 415
Tap 3 275 290 315 340 375 400 420 445 465
Tap 4 320 345 375 405 435 460 485 515 540
Tap 1 120 140 160 190 210 230 255 275 300
Tap 2 160 190 220 240 265 290 320 340 365
Tap 3 255 270 295 320 345 375 400 420 445
Tap 4 320 345 375 405 435 460 485 515 540
CBX32MV-036 BLOWER MOTOR WATTS AT −" (Minus) BDC3 SETTING (Adjust" Jumper at −" Setting)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Speed Positions
HEAT" Speed
BDC3 Jumper
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 120 135 165 185 205 225 245 265 300
COOL" Speed
Tap 2 140 165 195 215 245 270 300 315 335
Tap 3 185 210 240 265 285 310 330 360 385
Tap 4 245 255 290 310 335 355 380 405 430
Tap 1 90 110 135 155 180 195 210 230 250
Tap 2 120 140 160 185 215 235 255 275 295
Tap 3 160 190 225 240 275 295 320 350 380
Tap 4 245 255 290 310 335 355 380 405 430
Page 6
CBX32MV-048 AND CBX32MV-060 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
BDC3 Jumper Speed Positions
ADJUST"
Jumper
Setting
+ 1850 875 1960 925 2090 985 2150 1015 1625 765 1820 860 2055 970 2145 1010
NORM 1705 805 1800 850 1900 895 2005 945 1425 670 1625 765 1805 850 2005 945
− 1560 735 1625 765 1720 810 1770 835 1205 570 1375 650 1555 735 1725 815
NOTES − The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
Low speed cooling air volume is 70% of COOL speed setting (60% of COOL speed for production prior to August 2002). Production units September 2005 and
later;continuous blower speed for is approximately 38% of COOL speed setting. Earlier production units continuous blower speed is approximately 50% of COOL
speed setting.
Harmony Zone Control applications − Low speed cooling is approximately 400 cfm (190 L/s).
Lennox Harmony IIIt Zone Control applications − minimum blower speed is 442 cfm (210 L/s)
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
HEAT" Speed COOL" Speed
CBX32MV-048 AND CBX32MV-060 BLOWER MOTOR WATTS AT +" (Plus) BDC3 SETTING (Adjust" Jumper at +" Setting)
BDC3 Jumper Speed
HEAT"
Speed
Positions
Tap 1 455 505 540 585 630 665 710 745 780
Tap 2 555 595 645 675 730 780 820 865 895
Tap 3 680 720 770 820 865 900 945 985 1030
Tap 4 730 780 825 870 920 970 1020 1055 1110
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
COOL"
Speed
Tap 1 300 335 370 360 435 465 500 535 575
Tap 2 425 475 500 545 585 635 670 710 745
Tap 3 625 660 705 755 810 850 885 940 970
Tap 4 700 750 800 845 895 940 990 1030 1080
CBX32MV-048 AND CBX32MV-060 BLOWER MOTOR WATTS AT NORM" BDC3 SETTING (Adjust" Jumper at NORM Setting)
BDC3 Jumper Speed
Positions
HEAT"
Speed
COOL"
Speed
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 360 385 425 465 495 525 565 600 635
Tap 2 400 440 485 520 555 595 640 670 705
Tap 3 480 520 560 605 640 685 765 785 805
Tap 4 580 625 665 710 760 800 835 875 925
Tap 1 215 235 275 295 330 360 400 430 465
Tap 2 310 335 375 405 440 465 500 530 565
Tap 3 415 445 490 535 565 605 650 675 715
Tap 4 580 610 655 695 740 785 830 870 910
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
CBX32MV-048 AND CBX32MV-060 BLOWER MOTOR WATTS AT −" (Minus) BDC3 SETTING (Adjust" Jumper at −" Setting)
BDC3 Jumper Speed
Positions
HEAT"
Speed
COOL"
Speed
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Tap 1 265 305 340 370 410 440 460 505 540
Tap 2 320 350 395 420 450 475 515 545 580
Tap 3 375 410 435 470 515 545 575 610 645
Tap 4 400 435 480 525 555 595 640 670 700
Tap 1 140 170 195 215 250 275 300 335 360
Tap 2 200 230 260 285 315 355 385 415 450
Tap 3 280 315 340 380 415 445 465 505 540
Tap 4 375 420 440 475 515 550 575 610 645
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Page 7
CBX32MV-068 BLOWER PERFORMANCE
0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range
BDC3 Jumper Speed Positions
HEAT" Speed COOL" Speed
ADJUST"
Jumper
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
+ 1875 885 1975 930 2090 985 2150 1015 1640 775 1840 870 2075 980 2150 1015
NORM 1760 830 1825 860 1920 905 2030 960 1465 690 1625 765 1800 850 2000 945
− 1550 730 1650 780 1725 815 1800 850 1250 590 1390 655 1560 735 1720 810
NOTES − The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 60% of COOL speed setting. Production units September 2005 and later;continuous blower speed for is approximately 38% of
COOL speed setting. Earlier production units continuous blower speed is approximately 50% of COOL speed setting.
Lennox Harmony IIIt Zone Control applications − minimum blower speed is 442 cfm (210 L/s).
CBX32MV-068 BLOWER MOTOR WATTS AT +" (Plus) BDC3 SETTING (Adjust" Jumper at +" Setting)
BDC3 Jumper Speed
Positions
HEAT"
Speed
Tap 1 365 410 455 495 545 610 660 725 790
Tap 2 430 485 540 590 640 690 765 835 865
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Tap 3 540 585 635 695 750 800 815 840 865
Tap 4 665 710 755 770 790 810 830 845 870
COOL"
Speed
Tap 1 255 290 320 365 415 455 505 550 590
Tap 2 355 390 425 475 515 580 630 695 750
Tap 3 505 565 610 70 715 790 815 845 865
Tap 4 725 745 755 770 790 810 830 850 870
CBX32MV-068 BLOWER MOTOR WATTS AT NORM" BDC3 SETTING (Adjust" Jumper at NORM Setting)
BDC3 Jumper Speed
Positions
HEAT"
Speed
Tap 1 310 345 385 425 465 510 560 610 665
Tap 2 345 385 420 460 500 620 615 680 735
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Tap 3 385 430 480 525 580 640 695 750 815
Tap 4 475 525 560 615 660 720 785 845 810
COOL"
Speed
Tap 1 180 205 240 285 325 365 405 435 480
Tap 2 250 285 320 355 410 455 505 535 585
Tap 3 345 375 415 460 505 560 610 670 735
Tap 4 445 510 560 595 665 725 790 845 865
CBX32MV-068 BLOWER MOTOR WATTS AT −" (Minus) BDC3 SETTING (Adjust" Jumper at −" Setting)
BDC3 Jumper Speed
Positions
HEAT"
Speed
Tap 1 215 245 285 325 375 415 460 495 540
Tap 2 255 295 325 370 410 460 510 545 580
0 (0) 0.1 (25) 0.2 (50) 0.3 (75) 0.4 (100) 0.5 (125) 0.6 (150) 0.7 (175) 0.8 (200)
Motor Watts @ Various External Static Pressures − in. wg. (Pa)
Tap 3 295 330 375 395 445 495 555 600 660
Tap 4 335 370 400 445 505 550 600 660 705
COOL"
Speed
Tap 1 125 150 170 210 245 270 300 340 370
Tap 2 160 185 225 255 300 335 365 415 450
Tap 3 225 245 280 320 370 420 460 510 545
Tap 4 290 325 355 400 445 490 545 595 650
Page 8
Parts Arrangement
ELECTRIC HEAT
SECTION
CBX32MV
BLOWER ACCESS
PANEL
COIL ACCESS
PANEL
CONTROL BOX
BLOWER
COMPARTMENT
HORIZONTAL
DRAIN PAN
COIL
CHECK AND EXPANSION VALVE
(COMPLETE WITH SCREEN)
UPFLOW/DOWNFLOW
DRAIN PAN
FIGURE 1
SMALL ELECTRIC HEAT
KNOCK OUT FOR
2.5 − 15 kW
GROUNDING
LUGS
CBX32MV CONTROL BOX
LARGE ELECTRIC HEAT
ADDITIONAL KNOCK
OUT FOR
20 − 30 kW
BDC3 BLOWER
CONTROL (A15)
TERMINAL
STRIP
(TB2)
BLOWER
RELAY (K20)
TRANSFORMER
(T1)
TERMINAL
STRIP (TB1)
R
W3
W2
W1
G
C
0Y1Y2DS
FIGURE 2
Page 9
I−APPLICATION
CBX32MV blower coils are designed for R410A
applications only. All major blower coil components
must be matched according to Lennox
recomme n d ations fo r the unit to be covered under
warranty. Refer to the Engineering Handbook for approved
system matchups. A misapplied system will cause erratic
operation and can result in early unit failure. The units come
with factory installed check and expansion valve for all
applications. It has been installed internally and is accessible if
required.
II−UNIT COMPONENTS
A−Control Box
The CBX32MV control box is shown in figure 2. Line voltage
and electric heat connections are made in the control box.
Optional electric heat fits through an opening located in the
center of the control box. When electric heat is not used,
knockout plates cover the opening. The electric heat control
arrangement is detailed in the electric heat section of this
manual.
B−Terminal Strips (TB1 and TB2)
All CBX32MV units are equipped with two low voltage
terminal strips (TB1 and TB2) located in the control box.
See figure 2. The strips are used for making up all indoor
thermostat wires.
All CBX32MV units have factory installed jumpers
connecting DS to Y1, R to O and Y1 to Y2. These jumpers
will have to be removed in certain unit application. See table
1.
TABLE 1
Application
Harmony II, CCB1,
SignatureStatt
Remove Jumpers
DS to Y1
Heat Pump R to O
Two−Stage Cooling Y1 to Y2
C−Transformer (T1)
All CBX32MV series units use a single line voltage to
24VAC transformer mounted in the control box. The
transformer supplies power to the control circuits in the
indoor and outdoor unit.
D−Blower Relay (K20)
All units use SPDT relay to energize the blower motor in
response to heating demand. The relay coil is energized
when the 1st stage electric heat relay closes. When K20 is
energized, its N.O. contacts close to energize jack plug
JP46 pin 2 (located on blower drive control A15). When
JP46−2 is energized, the blower drive control immediately
energizes the blower on heating speed. Heating speed will
override cooling speed. K20−2 will energize the
economizer if used ( refer to wiring diagram.)
208 / 240 VOLT TRANSFORMER
PRIMARY
ORANGE
240 VOLTS
RED
208 VOLTS
BLACK
FIGURE 3
E−Circuit Breaker (CB8)−1 units & Fuse (F1)
All transformers used in the CBX32MV−1 series units are
equipped with internal secondary voltage overcurrent
protection. Each transformer uses a manual re−set circuit
breaker (CB8) located on the transformer. The circuit
breaker is connected in series with the blue secondary
voltage wire and is rated at 3.5 Amps. CBX23MV−2 units
and later are equipped with a fuse (F1) rated at 3 amps. F1
is connected in series with the blue secondary voltage wire
and like CB8 provides overcurrent protection.
SECONDARY
BLUE
YELLOW
CB8
F−Plastic Drain Pans
Both upflow/downflow and horizontal drain pans are
provided and installed on the CBX32MV units. The drain
pans are made from fiberglass-filled plastic. The drain hole
is used for right-hand air discharge only, and must be
plugged when the unit is configured for left-hand air
discharge (see page 24 for horizontal left-hand
application). Each pan has a set of connections, one for a
primary drain and one for an auxiliary drain.
G−Coil
All CBX32MV series units have dual slab coils arranged in
an "A" configuration. Each coil has two or three rows of
copper tubes fitted with ripple-edge aluminum fins. A check
and expansion valve complete with screen feeds multiple
parallel circuits through the coils. The coil is designed to
easily slide out of the unit cabinet.
Optional electric heating elements are sequenced so
blower relay K20 operates on a first on/last off basis.
H−Variable Speed Blower Motor (B3)
CBX32MV series units use a single-phase variable-speed
motor. See figure 4. A solid-state controller is attached to
the motor.
Page 10
CBX32MV MOTOR BLOWER HOUSING
ARROW MUST
BE UP
MOTOR
BLOWER HOUSING
CBX32MV BLOWER MOTOR
B3
SHAFT
MOTOR
CONTROLLER
J48
J49
CBX32MV BLOWER MOTOR COMPONENTS
STATOR
(WINDINGS)
BEARING
OUTPUT
SHAFT
ROTOR
FIGURE 4
I−BDC3 Blower Control Board (A15)
CFM on the CBX32MV unit is controlled by the BDC3 board
(A15) located in the control box. CFM can be obtained by
positioning jumpers (COOL, HEAT and ADJUST) on the
BDC3 board. The jumpers are labeled 1,2,3, and 4. Each
enables a different air volume. Diagnostic LEDs are
provided as an aid in identifying the unit’s mode of
operation. The LEDs are labeled RUN and CFM. See
figure 5.
BLOWER SPEED ADJUSTMENTS
Diagnostic LEDs
RUN"
RUN indicates there is a demand for the blower motor to
run.
CFM"
CFM LED indicates the CFM the unit is operating according to
the jumper settings. The light flashes once for approximately
every 100 CFM. For example, if the unit is operating at 1000
CFM, CFM LED will flash 10 times. If the CFM is 1150, CFM
LED will flash 11 full times plus one fast or half flash.
At times the light may appear to flicker or glow. This takes
place when the control is communicating with the motor
between cycles. This is normal operation.
The appropriate speed according to application and CFM
need is selected by moving jumper pins.
Jumper Settings
IMPORTANT
Before changing jumper setting, make sure the
motor has completely stopped. Any jumper setting change will not take place while the motor is
running.
Table 2 shows the recommended factory blower speed tap
selections for CBX32MV series units. These settings are
for nominal tonnage match−ups with the CBX32MV. When
matched with other sizes, it is recommended that the CFM
be adjusted to approximately 400 CFM per ton.
FACTORY BLOWER SPEED TAP SELECTION
UNIT
−018/
024
−024/
−030
−036
−048
−060
−068
*Minimum setting for heat.
COOL" HEAT"
Condensing
Unit
COOL
PIN #3
COOL
PIN #3
COOL
PIN #3
COOL
PIN #2
COOL
PIN #3
COOL
PIN #3
To change jumper positions, gently pull the jumper off the pins
and place it on the desired set of pins. The following section
outlines the different jumper selections available and
conditions associated with each one. Refer to figure 5 for
identification.
After the CFM for each application has been determined,
the jumper settings must be adjusted to reflect those given
in the blower data tables at the front of this manual. From
the tables determine which row of CFM volumes most
closely matches the desired CFM. Once a specific row has
been chosen (+, NORMAL, or −), CFM volumes from other
rows cannot be used. Below are the descriptions of each of
the jumper selections.
TABLE 2
SPEED TAP SELECTION
*Condensing Unit
Heat
PIN
#3
PIN
#3
PIN
#3
PIN
#2
PIN
#3
PIN
#3
with Electric Heat
Only
HEAT
PIN #4
HEAT
PIN #4
HEAT
PIN #4
HEAT
PIN #1
HEAT
PIN #1
HEAT
PIN #4
Pump
COOL
COOL
COOL
COOL
COOL
COOL
*Heat Pump
with Electric
Heat
HEAT
PIN #4
HEAT
PIN #4
HEAT
PIN #4
HEAT
PIN #1
HEAT
PIN #1
HEAT
PIN #4
Page 11
BDC3 VARIABLE SPEED CONTROL SELECTIONS
JP1 15 PIN PLUG
(BOARD TO MOTOR)
15
15
4
3
2
1
DIAGNOSTIC
4
3
2
1
CFM RUN
DS LEDS
ACCESSORY RELAY
CONTACTS
(DRIVES OPTIONAL
ACCESSORY
RELAY)
OPERATIONAL
SELECTOR PINS
(Affects both heating
and cooling modes)
11
JP1
ACC
24V/1A
NORM
4
+
3
−
2
TEST
ADJUST HEAT COOL DELAY
1
NOTE − For two speed heat pump units blower will operate at
60%, 65% or 70% of COOL CFM. For single speed heat pump
units blower will operate at 100% COOL CFM until
supplemental electric heat is demanded. At that time, the
blower will operate at HEAT speed selected. This arrangement
provides for warmer supply air during heat pump operation
only.
HEAT"
The HEAT jumper is used to determine CFM during a W1
demand for electric heat operation. These jumper
selections are activated when W1 is energized with or
without a Y1 demand for heat pump compressor.
DELAY"
HEATING SPEED
SELECTOR PINS
COOLING SPEED
SELECTOR PINS
FAN DELAY
SELECTOR PINS
FIGURE 5
ADJUST"
The ADJUST pins allow the motor to run at normal speed,
approximately 10% higher, or approximately 10% lower than
normal speed. The blower tables give three rows (+,
NORMAL, and −) with their respective CFM volumes. Notice
that the normal adjustment setting for heat speed position #3
is 1315 CFM. The + adjustment setting for that position is
1445 CFM and for the − adjustment setting is 1185 CFM.
After the adjustment setting has been determined, chose the
remainder speed jumper settings from those offered in the
table in that row.
The TEST pin is available to bypass the BDC3 control and
run the motor at approximately 70% to test that the motor is
operational. This is beneficial primarily in troubleshooting.
G must be energized for motor to run.
COOL"
The COOL jumper is used to determine the CFM during
either 1) cooling or 2) heat pump operation without a call for
electric heat. These jumper selections are activated for
cooling when Y2 and DS terminals in the CBX32MV are
energized and for heating when Y2 is energized.
Applications without the Lennox SignatureStatt or
TM
EfficiencyPlus
CCB1 humidity control will provide 70% of
the COOL CFM during first−stage cooling for two−speed
outdoor units. Units built prior to August 2002, will provide
either 60% (−048, −060 series units) or 65% (−036 series
units) of the COOL CFM during first stage cooling for two
stage outdoor units. 100% of COOL speed is provided for
systems with a single−speed outdoor units.
The DELAY jumper is used to set the specific motor fan
mode of operation during cooling. Depending on the
application, one of four fan options may be chosen by
moving the jumper pins to the appropriate set of pins.
Options 1, 2, 3, or 4 will have an increased dehumidification
effect on the system. Option 1 will have the least effect and
option 4 will have the greatest effect.
Applications with the EfficiencyPlus CCB1 humidity
control create different CFM volumes. For example,
during a first−stage cooling call (two−speed outdoor unit)
with no demand from the CCB1, the air volume is 40% of
the COOL jumper selection. For a normal COOL (Pin #2
setting for CBX32MV−036), the CFM is 1125; the reduced
speed is 450 CFM (1125 x 40% = 450). This arrangement
provides for additional dehumidification during standard
first stage cooling. See tables 10 and 11 for various
scenarios concerning use of the CCB1 humidity control
and the CBX32MV series unit.
Applications with the Lennox SignatureStat but no
demand for de−humidification will operate as follows:
during a first−stage cooling call (two−stage outdoor unit),
the air volume is 70% of the COOL jumper selection. For a
normal COOL (Pin #2 setting for CBX32MV−036), the
CFM is 1125; the reduced speed is 788 CFM (1125 x 70% =
788). This arrangement provides for additional
dehumidification during standard first stage cooling. See
tables 12 and 13 for various scenarios concerning use of
the SignatureStat and the CBX32MV series unit.
For applications with Harmonyr zone control, the blower
CFM volume is determined by the Harmony control center.
This speed is not adjustable. See footnotes in the blower
tables (table of contents).
Page 12
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