Lennox CBX32MV-018/024, CBX32MV-024/030, CBX32MV-060, CBX32MV-068, CBX32MV-036 User Manual

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Corp. 1005-L2

Service Literature

Revised April 7, 2015

CBX32MV (HFC-410A) SERIES UNITS (iComfort®-enabled)

NOTICE

A thermostat is not included and must be ordered separately.

 A Lennox iComfort

communicating applications.

 In non-communicating applications, the Lennox

ComfortSense as other non-communicating thermostats.

In all cases, setup is critical to ensure proper system operation.

Field wiring for both communicating and noncommunicating applications is illustrated in diagrams, which begin on page 24.

thermostat must be used in

7000 thermostat may be used, as well

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.

Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.

CAUTION

As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and use protective cloth ing.

CBX32MV

TABLE OF CONTENTS

Specifications 2.................................

Model Identification 3............................

Blower Data 3..................................

Electric Heat Data 9.............................

Upflow/Downflow Unit Dimensions 13..............

Horizontal LH/RH Unit Dimensions 14..............

Installation Clearances 15.........................

General 15......................................

Installation Requirements 15......................

Brazing Connections 19...........................

Condensate Drain Requirements 22................

Inspecting and Replacing Filters 23.................

Sealing the Unit 23...............................

Field Control Wiring 24...........................

Air Handler Control Button, Display and Jumpers 31..

Configuring Unit 36...............................

Error Code Recall Mode 43........................

Indoor Blower Test 44............................

Checkout Procedures 44..........................

Operation 45....................................

Maintenance 45..................................

Cabinet Insulation 45.............................

Sequence of Operations 47.......................

Unit Components 60..............................

Electric Heat (ECB40) 66.........................

This indoor unit is designed for installation with optional field-installed electric heat and a matched remote outdoor unit that is charged with HFC-410A refrigerant. These units, designed for indoor installation in multiple positions, are completely assembled for upflow and horizontal right-hand discharge before being shipped from the factory.

All CBX32MV air handlers are equipped with a factory-installed, internally mounted check expansion valve (CTXV), which is suitable for use in HFC-410A applications.

This air handler is compatible with the ComfortSense® 7000 non-communicating thermostat and non- communicating outdoor units. In addition, newer model units have the enhanced capability of communicating with iComfort thermostats and compatible outdoor units using the Lennox RSBus protocols.

NOTE - For downflow or horizontal left-hand air discharge, certain field modifications are required.

This document provides information only on the CBX32MV-XXX-230-6-06 and later which features the new iComfort-enabled hardware. Refer to Corp. 0206-L3 for earlier model service related information.

Page 1

2015 Lennox Industries Inc.

Specifications

General Data Model Number CBX32MV‐018/024 CBX32MV‐024/030 CBX32MV‐036

Nominal cooling capacity - tons (kW) 1.5 - 2 (5.3 - 7) 2 - 2.5 (7 - 8.8) 3 (10.6)

Refrigerant R-410A R-410A R-410A

Connections in. (mm)

Indoor Coil

Blower Data

Wheel nominal diameter x width - in. (mm) 10 x 7 (279 x 178) 10 x 8 (279 x 203) 10 x 8 (279 x 203)

Filters

Shipping Data - 1 Package lbs. (kg) 126 (57) 152 (69) 183 (83)

ELECTRICAL DATA

Voltage - phase - 60hz 208/230V-1ph

Maximum overcurrent protection (unit only)

Suction (vapor) line - sweat 5/8 (15.8) 3/4 (19) 3/4 (19)

Liquid line - sweat 3/8 (9.5) 3/8 (9.5) 3/8 (9.5)

Condensate drain (fpt) (2) 3/4 (19) (2) 3/4 (19) (2) 3/4 (19)

Net face area - ft.2 (m2) 3.56 (0.33) 4.44 (0.41) 5.0 (0.46)

Tube outside diameter - in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5)

Number of rows 3 3 3

Fins per inch (fins per m) 12 (472) 12 (472) 12 (472)

Motor output - hp (W) 1/2 (373) 1/2 (373) 1/2 (373)

Number and size - in. (1) 15 x 20 x 1 (1) 20 x 20 x 1 (1) 20 x 20 x 1

mm 381 x 508 x 25 508 x 508 x 25 508 x 508 x 25

208/230V-1ph 208/230V-1ph

15 15 15

Minimum circuit ampacity (unit only) 5 5 5

General Data Model Number CBX32MV‐048 CBX32MV‐060 CBX32MV‐068

Nominal cooling capacity - tons (kW) 4 (14.1) 5 (17.6) 5+ (17.6+)

Refrigerant HFC-410A HFC-410A HFC-410A

Connections in. (mm)

Suction (vapor) line - sweat 7/8 (22.2) 1‐1/8 (28) 1‐1/8 (28)

Liquid line - sweat 3/8 (9.5) 3/8 (9.5) 3/8 (9.5)

Condensate drain (fpt) (2) 3/4 (19) (2) 3/4 (19) (2) 3/4 (19)

Indoor Coil

Net face area - ft.2 (m2) 7.22 (0.67) 7.22 (0.67) 7.77 (0.72)

Tube outside diameter - in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5)

Number of rows 3 3 3

Fins per inch (fins per m) 12 (472) 12 (472) 12 (472)

Blower Data

Wheel nominal diameter x width - in. (mm) 12 x 9 (305 x 229) 12 x 9 (305 x 229) 15 x 9 (381 x 229)

Motor output - hp (W) 1 (746) 1 (746) 1 (746)

Filters

Number and size - in. (1) 20 x 24 x 1 (1) 20 x 24 x 1 (1) 20 x 25 x 1

mm 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

Maximum overcurrent protection (unit only)

20 20 20

208/230V-1ph 208/230V-1ph

Minimum circuit ampacity (unit only) 11 11 11

CBX32MV

Page 2

Optional Accessories

For up-to-date information, see any of the following publications:

 Lennox CBX32MV Product Specification bulletin (EHB)  Lennox Commercial Price Book

Model Identification

Unit Type

−

230CB 32 036

−−

Minor Revision Number

CB = Air Handler

Refrigerant Type

X = R-410A

Series

Configuration

MV = Multi-Position, Variable

speed blower motor

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

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)

Blower Data

CBX32MV018/024 BLOWER PERFORMANCE

0 through 0.80 in. w.g. External Static Pressure Range

Jumper Speed Positions

“AJUST”

Jumper Setting

NORM

NOTES:

cfm

715 855 1000 1130 465 690 900 1050

670

580 700 800 930 385 560 735 850

“HEAT” Speed “COOL” Speed

cfm

770 900 1035 425 620 825 950

cfm

 The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.  First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper

selectable) of the same secondstage COOL speed selected, minimum 250 cfm.

 Lennox Harmony III™ Zone Control applications - minimum blower speed of 250 cfm.

CBX32MV‐018/024 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting)

Jumper Speed Positions

Tap 1 100 113 126 142 154 172 190 206 230

HEAT Speed

COOL Speed

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 11 8 135

Tap 2 89 103 118 129 143 163 177 197 207

Tap 3 183 198 229 248 266 290 307 327 343

Tap 4 266 294 315 330 349 373 390 411 401

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)

Page 3

CBX32MV

CBX32MV‐018/024 BLOWER MOTOR WATTS AT NORM SETTING

Jumper Speed Positions

Tap 1 77 96 106 123 130 150 165 178 201

HEAT Speed

COOL Speed

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 94 106 114

Tap 2 71 83 101 113 125 138 156 166 185

Tap 3 137 158 176 199 219 238 254 273 296

Tap 4 211 225 249 272 295 318 331 342 367

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)

(Adjust Jumper at NORM Setting)

CBX32MV‐018/024 BLOWER MOTOR WATTS AT - (Minus) SETTING (Adjust Jumper at - Setting)

Jumper Speed Positions

Tap 1 59 73 89 106 113 130 142 156 173

HEAT Speed

COOL Speed

Tap 2 95 106 118 136 152 171 183 200 215

Tap 3 132 148 171 186 211 225 248 266 284

Tap 4 195 217 242 259 283 302 314 336 349

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

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)

CBX32MV024/030 BLOWER PERFORMANCE

0 through 0.80 in. w.g. External Static Pressure Range

Jumper Speed Positions

“AJUST”

Jumper Setting

NORM

NOTES:

cfm

800 935 1070 1210 660 880 1100 1320

725

655 765 880 990 540 720 900 1080

“HEAT” Speed “COOL” Speed

cfm

850 975 1100 600 800 1000 1200

cfm

selectable) of the same secondstage COOL speed selected, minimum 250 cfm.

 Lennox Harmony III™ Zone Control applications - minimum blower speed of 250 cfm.

CBX32MV‐024/030 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting)

Jumper Speed Positions

Tap 1 65 90 120 145 185 210 240 250 275

HEAT Speed

COOL Speed

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

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

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)

CBX32MV

Page 4

CBX32MV‐024/030 BLOWER MOTOR WATTS AT NORM SETTING

Jumper Speed Positions

Tap 1 50 75 100 135 155 180 195 215 230

HEAT Speed

COOL Speed

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

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)

(Adjust Jumper at NORM Setting)

CBX32MV‐024/030 BLOWER MOTOR WATTS AT - (Minus) SETTING (Adjust Jumper at - Setting)

Jumper Speed Positions

Tap 1 45 65 90 110 130 150 165 190 195

HEAT Speed

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

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)

CBX32MV036 BLOWER PERFORMANCE

0 through 0.80 in. w.g. External Static Pressure Range

Jumper Speed Positions

“AJUST”

Jumper Setting

NORM

NOTES:

cfm

1230 1335 1445 1545 900 1225 1380 1545

1120

1010 1185 1200 1265 730 1000 1135 1265

“HEAT” Speed “COOL” Speed

cfm

1215 1315 1400 810 1125 1275 1400

cfm

selectable) of the same secondstage COOL speed selected, minimum 250 cfm.

 Lennox Harmony III™ Zone Control applications - minimum blower speed of 250 cfm.

CBX32MV‐036 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting)

Jumper Speed Positions

Tap 1 220 235 265 290 310 335 360 385 465

HEAT Speed

COOL Speed

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

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

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)

Page 5

CBX32MV

CBX32MV‐036 BLOWER MOTOR WATTS AT NORM SETTING

Jumper Speed Positions

Tap 1 155 185 215 240 265 285 300 335 355

HEAT Speed

COOL Speed

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

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)

(Adjust Jumper at NORM Setting)

CBX32MV‐036 BLOWER MOTOR WATTS AT - (Minus) SETTING (Adjust Jumper at - Setting)

Jumper Speed Positions

Tap 1 120 135 165 185 205 225 245 265 300

HEAT Speed

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

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)

CBX32MV048 and CBX32MV060 BLOWER PERFORMANCE

0 through 0.80 in. w.g. External Static Pressure Range

Jumper Speed Positions

“AJUST”

Jumper Setting

NORM

NOTES:

1 2 3 4 1 2 3 4

cfm cfm cfm cfm cfm cfm cfm cfm

1850

1705

1560 1625 1720 1770 1205 1375 1555 1725

“HEAT” Speed “COOL” Speed

1960 2090 2150 1625 1820 2055 2145

1800 1900 2005 1425 1625 1805 2005

selectable) of the same secondstage COOL speed selected, minimum 450 cfm.

 Lennox Harmony III™ Zone Control applications - minimum blower speed of 450 cfm.

CBX32MV‐048 AND CBX32MV‐060 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting)

Jumper Speed Positions

Tap 1 455 505 540 585 630 665 710 745 780

HEAT Speed

COOL Speed

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

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

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)

CBX32MV

Page 6

CBX32MV‐048 AND CBX32MV‐060 BLOWER MOTOR WATTS AT NORM SETTING

Jumper Speed Positions

Tap 1 360 385 425 465 495 525 565 600 635

HEAT Speed

COOL Speed

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

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)

(Adjust Jumper at NORM Setting)

CBX32MV‐048 AND CBX32MV‐060 BLOWER MOTOR WATTS AT - (Minus) SETTING (Adjust Jumper at - Setting)

Jumper Speed Positions

Tap 1 265 305 340 370 410 440 460 505 540

HEAT Speed

COOL Speed

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

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)

CBX32MV068 BLOWER PERFORMANCE

0 through 0.80 in. w.g. External Static Pressure Range

Jumper Speed Positions

“AJUST”

Jumper Setting

NORM

NOTES:

cfm

1875 1975 2090 2150 1640 1840 2075 2150

1760

1550 1650 1725 1800 1250 1390 1560 1720

“HEAT” Speed “COOL” Speed

cfm

1825 1920 2030 1465 1625 1800 2000

cfm

selectable) of the same secondstage COOL speed selected, minimum 450 cfm.

 Lennox Harmony III™ Zone Control applications - minimum blower speed of 450 cfm.

CBX32MV‐068 BLOWER MOTOR WATTS AT + (Plus) SETTING (Adjust Jumper at + Setting)

Jumper Speed Positions

Tap 1 365 410 455 495 545 610 660 725 790

HEAT Speed

COOL Speed

Tap 2 430 485 540 590 640 690 765 835 865

Tap 3 540 585 635 695 750 800 815 840 865

Tap 4 665 710 755 770 790 810 830 845 870

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

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)

Page 7

CBX32MV

CBX32MV‐068 BLOWER MOTOR WATTS AT NORM SETTING (Adjust Jumper at NORM Setting)

Jumper Speed Positions

Tap 1 310 345 385 425 465 510 560 610 665

HEAT Speed

COOL Speed

Tap 2 345 385 420 460 500 620 615 680 735

Tap 3 385 430 480 525 580 640 695 750 815

Tap 4 475 525 560 615 660 720 785 845 810

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

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)

CBX32MV‐068 BLOWER MOTOR WATTS AT - (Minus) SETTING (Adjust Jumper at - Setting)

Jumper Speed Positions

Tap 1 215 245 285 325 375 415 460 495 540

HEAT Speed

COOL Speed

Tap 2 255 295 325 370 410 460 510 545 580

Tap 3 295 330 375 395 445 495 555 600 660

Tap 4 335 370 400 445 505 550 600 660 705

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

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)

CBX32MV

Page 8

Electric Heat Data

ELECTRIC HEAT DATA - CBX32MV-018/024 AND CBX32MV-024/030

SINGLE PHASE ELECTRIC HEAT

Btuh

Input

2.5 kW

4 lbs.

Model Number

ECB40-2.5 (34W86)

Terminal Block

No. of

Stages

Volts InputkWInput

208 1.9 6,400 4.0 16 20 - - - - - - - - - - - -

220 2.1 7,200 4.0 17 20 - - - - - - - - - - - -

230 2.3 7,800 4.0 18 20 - - - - - - - - - - - -

240 2.5 8,500 4.0 18 20 - - - - - - - - - - - -

4 kW

4 lbs.

ECB40-4 (55W89)

Terminal Block

ECB40-4CB (55W90)

30A Circuit breaker

208 3.0 10,250 4.0 23 25 23 - - - 25 - - -

220 3.4 11,450 4.0 24 25 24 - - - 25 - - -

230 3.7 12,550 4.0 25 25 25 - - - 25 - - -

240 4.0 13,650 4.0 26 30 26 - - - 30 - - -

5 kW

4 lbs.

ECB40-5 (34W87)

Terminal Block

ECB40-5CB (34W90)

35A Circuit breaker

208 3.8 12,800 4.0 28 30 28 - - - 30 - - -

220 4.2 14,300 4.0 29 30 29 - - - 30 - - -

230 4.6 15,700 4.0 30 30 30 - - - 30 - - -

240 5.0 17,100 4.0 31 35 31 - - - 35 - - -

6 kW

4 lbs.

ECB40-6 (34W88)

Terminal Block

ECB40-6CB (34W91)

40A Circuit breaker

208 4.5 15,400 4.0 32 35 32 - - - 35 - - -

220 5.0 17,100 4.0 33 35 33 - - - 35 - - -

230 5.5 18,800 4.0 35 35 35 - - - 35 - - -

240 6.0 20,500 4.0 36 40 36 - - - 40 - - -

8 kW

5 lbs.

ECB40-8 (34W89)

Terminal Block

ECB40-8CB (34W92)

50A Circuit breaker

208 6.0 20,500 4.0 41 45 41 - - - 45 - - -

220 6.7 22,900 4.0 43 45 43 - - - 45 - - -

230 7.3 25,100 4.0 45 45 45 - - - 45 - - -

240 8.0 27,300 4.0 47 50 47 - - - 50 - - -

9 kW

5 lbs.

ECB40-9CB (34W93)

60A Circuit breaker

208 6.8 23,100 4.0 - - - - - - 46 - - - 50 - - -

220 7.6 25,800 4.0 - - - - - - 48 - - - 50 - - -

230 8.3 28,200 4.0 - - - - - - 50 - - - 50 - - -

240 9.0 30,700 4.0 - - - - - - 52 - - - 60 - - -

12.5 kW 10 lbs.

ECB40-12.5CB (34W94)

(1) 30A & (1) 45A Circuit

breaker

208 9.4 32,000 4.0 - - - - - - 24 38 25 40

220 10.5 35,800 4.0 - - - - - - 25 40 25 40

230 11.5 39,200 4.0 - - - - - - 26 42 30 45

240 12.5 42,600 4.0 - - - - - - 27 44 30 45

15 kW

12 lbs.

ECB40-15CB (34W95)

(1) 35A & (1) 60A Circuit

breaker

208 11.3 38,400 4.0 - - - - - - 28 45 30 45

220 12.6 43,000 4.0 - - - - - - 29 48 30 50

230 13.8 47,000 4.0 - - - - - - 30 50 30 50

240 15.0 51,200 4.0 - - - - - - 31 52 35 60

NOTE − Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.

Electric heater capacity only − does not include additional blower motor heat capacity.

Amps shown are for blower motor only.

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least

167F.

Bold text indicates that the circuit breaker on “CB” circuit breaker models must be replaced with size noted. See Table on page 6.

HACR type circuit breaker or fuse.

Blower Motor

Full Load

Amps

CBX32MV-018/024 CBX32MV-024/030

Minimum

Circuit

Ampacity

Maximum

Overcurrent

Protection

Minimum

Circuit

Ampacity

Circuit Circuit

Overcurrent

1 2 1 2

Maximum

Protection

Page 9

CBX32MV

ELECTRIC HEAT DATA - CBX32MV-036

SINGLE PHASE ELECTRIC HEAT

No. of

Stages

4 kW

4 lbs.

5 kW

4 lbs.

6 kW

4 lbs.

8 kW

5 lbs.

9 kW

5 lbs.

12.5 kW

10 lbs.

15 kW

12 lbs.

20 kW

19 lbs.

Model Number

ECB40−4 (55W89)

Terminal Block

ECB40−4CB (55W90)

35A Circuit breaker

ECB40−5 (34W87)

Terminal Block

ECB40−5CB (34W90)

35A Circuit breaker

ECB40−6 (34W88)

Terminal Block

ECB40−6CB (34W91)

40A Circuit breaker

ECB40−8 (34W89)

Terminal Block

ECB40−8CB (34W92)

50A Circuit breaker

ECB40−9CB (34W93)

60A Circuit breaker

ECB40−12.5CB (34W94)

(1) 30A & (1) 45A Circuit

breaker

ECB40−15CB (34W95)

(1) 35A & (1) 60A Circuit

breaker

ECB40−20CB (34W96)

(2) 60A Circuit breaker

THREE PHASE ELECTRIC HEAT

8 kW

5 lbs.

10 kW

6 lbs.

15 kW

12 lbs.

ECB40−8 (34W98)

Terminal Block

ECB40−10 (34W99)

Terminal Block

ECB40−15CB (35W00)

50A Circuit breaker

CBX32MV-036

Maximum

Overcurrent

Protection

Volts InputkWInput

Btuh In

put

Blower Mo

tor Full Load

Amps

Minimum Circuit

Ampacity

Circuit Circuit

1 2 1 2

208 3.0 10,250 4.0 23 - - - 25 - - -

220 3.4 11,450 4.0 24 - - - 25 - - -

230 3.7 12,550 4.0 25 - - - 25 - - -

240 4.0 13,650 4.0 26 - - - 30 - - -

208 3.8 12,800 4.0 28 - - - 30 - - -

220 4.2 14,300 4.0 29 - - - 30 - - -

230 4.6 15,700 4.0 30 - - - 30 - - -

240 5.0 17,100 4.0 31 - - - 35 - - -

208 4.5 15,400 4.0 32 - - - 35 - - -

220 5.0 17,100 4.0 33 - - - 35 - - -

230 5.5 18,800 4.0 35 - - - 35 - - -

240 6.0 20,500 4.0 36 - - - 40 - - -

208 6.0 20,500 4.0 41 - - - 45 - - -

220 6.7 22,900 4.0 43 - - - 45 - - -

230 7.3 25,100 4.0 45 - - - 45 - - -

240 8.0 27,300 4.0 47 - - - 50 - - -

208 6.8 23,100 4.0 46 - - - 50 - - -

220 7.6 25,800 4.0 48 - - - 50 - - -

230 8.3 28,200 4.0 50 - - - 50 - - -

240 9.0 30,700 4.0 52 - - - 60 - - -

208 9.4 32,000 4.0 24 38 25 40

220 10.5 35,800 4.0 25 40 25 40

230 11.5 39,200 4.0 26 42 30 45

240 12.5 42,600 4.0 27 44 30 45

208 11.3 38,400 4.0 28 45 30 45

220 12.6 43,000 4.0 29 48 30 50

230 13.8 47,000 4.0 30 50 30 50

240 15.0 51,200 4.0 31 52 35 60

208 15.0 51,200 4.0 46 50 50 50

220 16.8 57,300 4.0 48 53 50 60

230 18.4 62,700 4.0 50 55 50 60

240 20.0 68,200 4.0 52 57 60 60

208 6.0 20,500 4.0 26 - - - 30 - - -

220 6.7 22,900 4.0 27 - - - 30 - - -

230 7.3 25,100 4.0 28 - - - 30 - - -

240 8.0 27,300 4.0 28 - - - 30 - - -

208 7.5 25,600 4.0 31 - - - 35 - - -

220 8.4 28,700 4.0 33 - - - 35 - - -

230 9.2 31,400 4.0 34 - - - 35 - - -

240 10.0 34,100 4.0 35 - - - 35 - - -

208 11.3 38,400 4.0 44 - - - 45 - - -

220 12.6 43,000 4.0 46 - - - 50 - - -

230 13.5 47,000 4.0 48 - - - 50 - - -

240 15.0 51,200 4.0 50 - - - 50 - - -

CBX32MV

Page 10

ELECTRIC HEAT DATA - CBX32MV-036 (Continued)

THREE PHASE ELECTRIC HEAT

Blower Mo

tor Full Load

Amps

put

Btuh In

put

20 kW

19 lbs.

Model Number

ECB40−20CB (35W01)

(2) 35A Circuit breaker

No. of

Stages

Volts

kW In

Input

208 15.0 51,200 4.0 31 26 35 30

220 16.8 57,300 4.0 33 28 35 30

230 18.4 62,700 4.0 34 29 35 30

240 20.0 68,200 4.0 35 30 35 35

NOTE - Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.

Electric heater capacity only − does not include additional blower motor heat capacity.

Amps shown are for blower motor only.

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least

167F.

Bold text indicates that the circuit breaker on “CB” circuit breaker models must be replaced with size noted. See Table on page 6.

HACR type circuit breaker or fuse.

CBX32MV-036

Minimum Circuit

Ampacity

Maximum

Overcurrent

Protection

Circuit Circuit

1 2 1 2

ELECTRIC HEAT DATA - CBX32MV-048, CBX32MV-060, AND CBX32MV-068

SINGLE PHASE ELECTRIC HEAT

Model Number

4 kW

4 lbs.

5 kW

4 lbs.

6 kW

4 lbs.

8 kW

5 lbs.

9 kW

5 lbs.

12.5 kW

10 lbs.

15 kW

12 lbs.

ECB40-4 (55W89)

Terminal Block

ECB40-4CB (55W90)

35A Circuit breaker

ECB40-5 (34W87)

Terminal Block

ECB40-5CB (34W90)

35A Circuit breaker

ECB40-6 (34W88)

Terminal Block

ECB40-6CB (34W91)

40A Circuit breaker

ECB40-8 (34W89)

Terminal Block

ECB40-8CB (34W92)

50A Circuit breaker

ECB40-9CB (34W93)

60A Circuit breaker

ECB40-12.5CB (34W94) (1) 30A & (1) 45A Circuit

breaker

ECB40-15CB (34W95)

(1) 35A & (1) 60A Circuit

breaker

No. of Stage

Volts InputkWInput

Btuh

Input

208 3.0 10,250 7.4 27 - - - - - - 30 - - - - - -

220 3.4 11,450 7.4 28 - - - - - - 30 - - - - - -

230 3.7 12,550 7.4 29 - - - - - - 30 - - - - - -

240 4.0 13,650 7.4 30 - - - - - - 30 - - - - - -

208 3.8 12,800 7.4 32 - - - - - - 35 - - - - - -

220 4.2 14,300 7.4 33 - - - - - - 35 - - - - - -

230 4.6 15,700 7.4 34 - - - - - - 35 - - - - - -

240 5.0 17,100 7.4 35 - - - - - - 35 - - - - - -

208 4.5 15,400 7.4 36 - - - - - - 40 - - - - - -

220 5.0 17,100 7.4 38 - - - - - - 40 - - - - - -

230 5.5 18,800 7.4 39 - - - - - - 40 - - - - - -

240 6.0 20,500 7.4 41 - - - - - - 45 - - - - - -

208 6.0 20,500 7.4 45 - - - - - - 45 - - - - - -

220 6.7 22,900 7.4 47 - - - - - - 50 - - - - - -

230 7.3 25,100 7.4 49 - - - - - - 50 - - - - - -

240 8.0 27,300 7.4 51 - - - - - - 60 - - - - - -

208 6.8 23,100 7.4 50 - - - - - - 50 - - - - - -

220 7.6 25,800 7.4 52 - - - - - - 60 - - - - - -

230 8.3 28,200 7.4 54 - - - - - - 60 - - - - - -

240 9.0 30,700 7.4 56 - - - - - - 60 - - - - - -

208 9.4 32,000 7.4 28 38 - - - 30 40 - - -

220 10.5 35,800 7.4 29 40 - - - 30 40 - - -

230 11.5 39,200 7.4 30 42 - - - 30 45 - - -

240 12.5 42,600 7.4 31 44 - - - 35 45 - - -

208 11.3 38,400 7.4 32 45 - - - 35 45 - - -

220 12.6 43,000 7.4 33 48 - - - 35 50 - - -

230 13.5 47,000 7.4 34 50 - - - 35 50 - - -

240 15.0 51,200 7.4 35 52 - - - 35 60 - - -

CBX32MV-048, CBX32MV-060, AND CBX32MV-068

Blower

Motor Full

Load

Amps

Minimum Circuit Ampacity

Circuit1Circuit2Circuit3Circuit1Circuit2Circuit

Maximum Overcurrent

Protection

Page 11

CBX32MV

20 kW

19 lbs.

ECB40-20CB (34W96) (2) 60A Circuit breaker

208 15.0 51,200 7.4 50 50 - - - 50 50 - - -

220 16.8 57,300 7.4 52 53 - - - 60 60 - - -

230 18.4 62,700 7.4 54 55 - - - 60 60 - - -

240 20.0 68,200 7.4 56 57 - - - 60 60 - - -

25 kW

19 lbs.

ECB40-25CB (34W97)

(1) 60A & (2) 45A Circuit

breaker

208 18.8 64,100 7.4 47 38 38 50 40 40

220 21.0 71,700 7.4 49 40 40 50 40 40

230 23.0 78,300 7.4 51 42 42 60 45 45

240 25.0 85,300 7.4 53 44 44 60 45 45

THREE PHASE ELECTRIC HEAT

8 kW

5 lbs.

10 kW

6 lbs.

15 kW

12 lbs.

20 kW

19 lbs.

25 kW

19 lbs.

NOTE - Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.

Electric heater capacity only − does not include additional blower motor heat capacity.

Amps shown are for blower motor only.

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least

167F.

Bold text indicates that the circuit breaker on “CB” circuit breaker models must be replaced with size noted. See Table on page 6.

HACR type circuit breaker or fuse.

ECB40-8 (34W98)

Terminal block

ECB40-10 (34W99)

Terminal block

ECB40-15CB (35W00)

50A Circuit breaker

ECB40-20CB (35W01) (2) 35A Circuit breaker

ECB40-25CB (35W02)

(1) 50A & (1) 40A Circuit

breaker

208 6.0 20,500 7.4 30 - - - - - - 35 - - - - - -

220 6.7 22,900 7.4 31 - - - - - - 35 - - - - - -

230 7.3 25,100 7.4 32 - - - - - - 35 - - - - - -

240 8.0 27,300 7.4 33 - - - - - - 35 - - - - - -

208 7.5 25,600 7.4 35 - - - - - - 40 - - - - - -

220 8.4 28,700 7.4 37 - - - - - - 40 - - - - - -

230 9.2 31,400 7.4 38 - - - - - - 40 - - - - - -

240 10.0 34,100 7.4 39 - - - - - - 40 - - - - - -

208 11.3 38,400 7.4 48 - - - - - - 50 - - - - - -

220 12.6 43,000 7.4 51 - - - - - - 60 - - - - - -

230 13.5 47,000 7.4 52 - - - - - - 60 - - - - - -

240 15.0 51,200 7.4 54 - - - - - - 60 - - - - - -

208 15.0 51,200 7.4 35 26 - - - 40 30 - - -

220 16.8 57,300 7.4 37 28 - - - 40 30 - - -

230 18.4 62,700 7.4 38 29 - - - 40 30 - - -

240 20.0 68,200 7.4 39 30 - - - 40 35 - - -

208 18.8 64,100 7.4 42 33 - - - 45 35 - - -

220 21.0 71,700 7.4 44 34 - - - 45 35 - - -

230 23.0 78,300 7.4 45 36 - - - 50 40 - - -

240 25.0 85,300 7.4 47 38 - - - 50 40 - - -

CBX32MV

Page 12

CBX32MV Upflow and Downflow Unit Dimensions — Inches (millimeters)

3/4 (19)

SUPPLY AIR

OPENING

11‐1/16 (281)

LINE VOLTAGE

INLETS (TOP

AND LEFT SIDE)

TOP VIEW

3/4 (19)

LOW VOLTAGE

INLETS (TOP AND

RIGHT SIDE)

5/8 (16)

AIR

FLOW

OPTIONAL

ELECTRIC HEAT

(FIELD-INSTALLED)

SUCTION

RETURN AIR

5/8 (16) 1 (25)

KNOCKOUT FOR OPTIONAL HEALTHY

CLIMATE

GERMICIDAL UVC LIGHT.

FRONT VIEW

FILTER ACCESS

5/8 (16)

UPFLOW POSITION

LINE

LIQUID

LINE

FILTER

(FOR UPFLOW AND DOWNFLOW POSITIONS)

1‐1/8 (29)

(51)

5‐3/8 (137)

BLOWER

COIL

RETURN AIR

SIDE VIEW

PIPING PLATE DETAIL

2‐3/4 (70)

5/8 (16)

1‐3/4 (44)

FILTER

SUCTION

LINE

LIQUID

LINE

OPTIONAL

ELECTRIC HEAT

(FIELD-INSTALLED)

LOW VOLTAGE

(RIGHT SIDE)

LINE VOLTAGE

(LEFT SIDE)

4‐3/8 (111)

SUCTION LINE

CONDENSATE DRAINS (2) (HORIZONTAL)

LIQUID LINE

CONDENSATE DRAINS (2) (UPFLOW AND DOWNFLOW)

3‐1/2 (89)

11‐1/16 (281)

5/8 (16)

COIL

BLOWER

SUPPLY

AIR

5/8 (16)

KNOCKOUT FOR OPTIONAL HEALTHY

CLIMATE

SIDE VIEW

DOWNFLOW POSITION

5/8 (16)

GERMICIDAL UVC LIGHT.

5/8 (16)

RETURN

OPENING

1 (25)

TOP VIEW

AIR FLOW

SUPPLY AIR

FRONT VIEW

5/8 (16)

AIR

FILTER ACCESS

5/8 (16)

CBX32MV Model Dimensions (Upflow, Downflow, Left- and Right-Hand Horizontal applications)

Dim.

-018/024 -024/030 -036 -048 and -060 -068

in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)

45-1/4 (1149) 49-1/4 (1251) 51 (1295) 58‐1/2 (1486) 65 (1651)

16-1/4 (413) 21-1/4 (540) 21‐1/4 (540) 21‐1/4 (540) 21-1/4 (540)

20-5/8 (524) 20-5/8 (524) 22‐5/8 (575) 24‐5/8 (625) 26-5/8 (676)

14-3/4 (375) 19-3/4 (502) 19‐3/4 (502) 19‐3/4 (502) 19-3/4 (502)

19 (483) 19 (483) 21 (533) 23 (584) 25 (635)

15 (381) 20 (508) 20 (508) 20 (508) 20 (508)

24-5/8 (625) 24-5/8 (625) 26‐3/8 (670) 27‐7/8 (708) 32-3/8 (822)

20-5/8 (524) 24-5/8 (625) 24‐5/8 (625) 30‐5/8 (778) 32-5/8 (829)

Page 13

CBX32MV

CBX32MV Horizontal Left- and Right-Hand Unit Dimensions — Inches (mm)

5‐3/8 (137)

CONDENSATE

DRAINS (2)

(UPFLOW AND

DOWNFLOW)

CONDENSATE

DRAINS (2)

(HORIZONTAL)

PIPING PLATE

DETAIL

5/8 (16)

5‐3/4

(46)

RETURN AIR

OPENING

END VIEW

Horizontal Position

(Left‐Hand Air

Discharge)

1‐3/4

(44)

(51)

LIQUID

1‐1/2

(38)

1 (25)

FILTER ACCESS

LINE

SUCTION

LINE

1‐1/8

(29)

4‐3/8

(111)

FILTER

Horizontal Position

(Right‐Hand Air

Discharge)

COIL

LIQUID

SUCTION

LINE

TOP VIEW

AIR

FLOW

FRONT VIEW

BLOWER

OPTIONAL ELECTRIC

HEAT (FIELD-INSTALLED)

COIL

5/8 (16)

LINE VOLTAGE

INLETS (TOP

AND RIGHT

SIDE)

LOW VOLTAGE

INLETS

(BOTTOM AND

RIGHT SIDE)

FOR DIMENSIONS “A”

THROUGH “H”, SEE CHART ON

4‐3/8

(111)

1‐1/8

(29)

PAGE 13.

11‐1/16

(281)

SUPPLY

AIR

OPENING

END VIEW

3/4 (19)

11‐1/16

(281)

SUPPLY

OPENING

LINE VOLTAGE INLETS

(BOTTOM AND LEFT SIDE)

END VIEW

INLETS (TOP AND

AIR

LOW VOLTAGE

LEFT SIDE)

OPTIONAL ELECTRIC

HEAT (FIELD INSTALLED)

5/8 (16)

CONDENSATE DRAINS (2)

(HORIZONTAL)

TOP VIEW

AIR

FLOW

FRONT VIEW

FILTER

SUCTION

LINE

1‐3/4

(44)

LIQUID

LINE

5‐3/4 (146)

SUCTION LINE

PIPING PLATE

DETAIL

FILTER ACCESS

1‐1/2 (38)

LIQUID

LINE

1 (25)

(51)

RETURN

AIR OPENING

END VIEW

5‐3/8 (137)

5/8 (16)

CBX32MV

Page 14

General

All CBX32MV air handlers are equipped with a factory-installed, internally mounted check expansion valve (CTXV), which is suitable for use in HFC-410A applications.

NOTE - For downflow or horizontal left-hand air discharge, certain field modifications are required.

These instructions are intended as a general guide and do not supersede local or national codes in any way. Consult authorities having jurisdiction before installation. Check equipment for shipping damage; if found, immediately report damage to the last carrier.

Installation Clearances

Cabinet 0 inch (0 mm)

To Plenum 1 inch (25 mm)

To Outlet Duct within 3 feet (914 mm)

Floor See Note #1

Service / Maintenance See Note #2

Units installed on combustible floors in the down-flow position with

electric heat require optional down-flow additive base.

2 Front Service Access - 24 inches (610mm) minimum.

NOTE - If cabinet depth is more than 24 inches (610 mm), allow a minimum of the cabinet depth plus 2 inches (51 mm).

1 inch (25 mm)

WARNING

The State of California has determined that this product may contain or produce a chemical or chemicals, in very low doses, which may cause serious illness or death. It may also cause cancer, birth defects, or reproductive harm.

IMPORTANT

The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.

WARNING

During blower operation, the ECM motor emits energy that may interfere with pacemaker operation. Interference is reduced by both the sheet metal cabinet and distance.

WARNING

Improper installation of the air handler can result in personal injury or death.

Do not allow external combustion products or other contaminants to enter the return air system or to be mixed with air that will be supplied to the living space. Use sheet metal screws and joint tape or duct mastic to seal return air system to air handler. In platform installations, the air handler should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the air handler. Allow absolutely no sagging, cracks, gaps. etc.

For no reason should return and supply air duct systems ever be connected to or from other heating devices such as a fireplace or stove. etc. Fire, explosion, carbon monoxide poisoning, personal injury and/or property damage could result.

Requirements

In addition to conforming to manufacturer's installation instructions and local municipal building codes, installation of Lennox air handler units (with or without optional electric heat), MUST conform with the following National Fire Protection Association (NFPA) standards:

 NFPA No. 90A — Standard for Installation of Air

Conditioning and Ventilation Systems

 NFPA No. 90B — Standard for Installation of Residence

Type Warm Air Heating and Air Conditioning Systems

This unit is approved for installation clearance to combustible material as stated on the unit rating plate. Accessibility and service clearances must take precedence over combustible material clearances.

Installation Requirements

CBX32MV units are factory-configured for upflow and horizontal right-hand discharge installation. For downflow or horizontal left-hand discharge, certain field modifications are required.

DISASSEMBLE AND REASSEMBLE AIR HANDLER UNIT

This unit consists of two sections which are shipped assembled from the factory. If necessary, the unit may be disassembled to facilitate setting the unit. Follow the steps below:

To disassemble:

1. Remove access panels.

2. Remove both blower and coil assemblies. This will lighten the cabinet for lifting.

3. Remove one screw from the left and right posts inside the unit. Remove one screw from each side on the back of the unit. Unit sections will now separate.

To reassemble:

1. Align cabinet sections together.

2. Reinstall screws.

3. Replace blower and coil assemblies.

4. Replace access panel.

UPFLOW APPLICATION

Use the following procedures to configure the unit for upflow operations:

Page 15

CBX32MV

HORIZONTAL DRAIN PAN (MUST BE REMOVED)

UPFLOW/

DOWNFLOW

DRAIN PAN

Figure 1. Upflow Configuration

NOTE - (-068 model Only) Remove access panels and the horizontal drip shield along with the corrugated padding between the blower and coil assembly before operation. Discard drip shields from the foam pads on top of the unit. Shields are used for downflow applications only.

1. The horizontal drain pan must be removed when the coil blower is installed in the upflow position. Removing horizontal drain pain will allow proper airflow and increase efficiency.

2. After removing horizontal drain pan, place the unit in desired location. Set unit so that it is level. Connect return and supply air plenums as required using sheet metal screws as illustrated in Figure 1.

3. Install units that have no return air plenum on a stand that is at least 14” from the floor to allow for proper air return. Lennox offers an optional upflow unit stand as listed in Table 1.

Table 1. Optional Unit Side Stand (Upflow Only)

Models

-018/024 45K31

-024/030, -036, -048 and -060

Kit Numbers

45K32

HORIZONTAL RIGHT-HAND DISCHARGE APPLICATION

NOTE - When air handler is located above a finished space, the secondary drain pan must have a larger footprint than the air handler. In addition, a 3/4” (19.1MM) overflow drain line must be:

 Connected to secondary drain pan

 Connected to the overflow drain outlet of the air handler

drain pan.

Use the following procedures to configure the unit for horizontal right-hand discharge operations:

NOTE - For horizontal applications, a secondary drain pan is recommended. Refer to local codes.

NOTE - (-068 Model Only) Before operating the unit, remove access panels and the horizontal drip shield and the corrugated padding between the blower and coil assembly. Discard the corrugated padding and the downflow drip shields from the foam pads on top of the unit.

NOTE - (-068 Model Only) Install the horizontal shield on the front edge of the horizontal drain pan as illustrated in Figure 2.

4. No further adjustment is necessary. Set unit so that it is sloped 1/4 inch (6.35mm) towards the drain pan end of the unit.

UP-LOAD / DOWNFLOW

DRAIN PAN

HORIZONTAL DRAIN

PAN

NO ADJUSTMENT IS NECESSARY

Figure 2. Right-Hand Discharge Configuration

5. If the unit is suspended, the entire length of the cabinet must be supported. If you use a chain or strap, use a piece of angle iron or sheet metal attached to the unit (either above or below) to support the length of the cabinet. Use securing screws no longer than 1/2 inch (12.7mm) to avoid damaging the coil or filter as illustrated in Figure 4. Use sheet metal screws to connect the return and supply air plenums as required.

HORIZONTAL RIGHT-HAND DISCHARGE APPLICATION IN HIGH HUMIDITY AREAS

For horizontal applications in high humidity areas remove the downflow rail closest to the drain pan.

HORIZONTAL DRIP SHIELD (-068

MODELS)

DOWNFLOW RAIL

CBX32MV

Page 16

CABINET

SUPPORT

DRAIN PAN

REINSTALLED

HERE

TOP CAP ROTATED TO

CORRECT POSITION

90º

BEND

TOP CAP SCREWS

3/16” PLASTIC PLUG (REAR COIL END SEAL)

HORIZONTAL DRIP SHIELD SCREW (FRONT COIL END SEAL)

DRAIN PAN SHIPPING LOCATION

INSTALL DRAIN PAN

BETWEEN TAB AND

EXTERIOR INNER WALL.

DETAIL C

REINSTALLED HERE REMOVED FROM HERE

———— DRAIN PLUGS ————

FRONT VIEW

COIL SHOWN IN UPFLOW POSITION FOR EASY

CONVERSION (LEFT-HAND AIR DISCHARGE)

DETAIL A

Figure 3. Field Modification for Left-Hand Discharge

To remove rail:

1. Remove the screws from the rail at the back of unit and at the cabinet support rail.

2. Remove the downflow rail then replace screws.

3. Seal around the exiting drain pipe, liquid line, and suction line to prevent humid air from infiltrating into the unit.

IMPORTANT

When removing the coil, there is possible danger of equipment damage and personal injury. Be careful when removing the coil assembly from a unit installed in rightor left-hand applications. The coil may tip into the drain pan once it is clear of the cabinet. Support the coil when removing it.

1/2 IN. SCREWS MAXIMUM

ANGLE IRON OR

SHEET METAL

FRONT VIEW END VIEW

Figure 4. Suspending Horizontal Unit

HORIZONTAL LEFT-HAND DISCHARGE APPLICATION

Use the following procedures to configure the unit for horizontal left-hand discharge operations:

ELECTRICAL INLET

CLEARANCE 4 IN. (102 MM)

TOP CAP

DETAIL B

90º

BEND

ALIGN HOLES WITH HOLES IN COIL END PLATE.

BACK COIL END SEAL

NOTE - For horizontal applications, a secondary drain pan is recommended. Refer to local codes.

NOTE - (-068 Model Only) Remove access panels and horizontal drip shield from the corrugated padding between the blower and coil assembly. Discard the corrugated padding and the downflow drip shields from the foam pads on top of the unit. (The shields are used for downflow applications only.)

IMPORTANT

After removal of drain pan plug(s), check drain hole(s) to verify that drain opening is fully open and free of any debris. Also check to make sure that no debris has fallen into the drain pan during installation that may plug up the drain opening.

1. Pull the coil assembly from unit. Pull off the horizontal drain pan.

2. Remove the drain plugs from back drain holes on horizontal drain pan and reinstall them on front holes.

3. Rotate drain pan 180º front‐to‐back and install it on the opposite side of the coil.

4. Remove screws from top cap as illustrated in Figure 3, Detail A.

5. Remove horizontal drip shield screw located in the left center of the back coil end seal as illustrated in Figure 3, Detail A.

6. Rotate horizontal drip shield 180º front to back.

7. Remove plastic plug from hole located on the left center of front coil end seal and reinstall plug in back hole on rear coil end seal.

8. Reinstall horizontal drip shield screw in front coil end seal. Drip shield should drain downward into horizontal drain pan inside coil.

Page 17

CBX32MV

9. Rotate top cap 180º front‐to‐back and align with unused screw holes. Holes must align with front and back coil end plates. The top cap has a 45º bend on one side and a 90º bend on the other. The 90º bend must be on the same side as the horizontal drain pan as illustrated in Figure 3, Detail B.

NOTE - Be very careful when you reinstall the screws into coil end plate engaging holes. Misaligned screws may damage the coil.

HORIZONTAL DRIP SHIELD (-068 MODEL)

DOWNFLOW RAIL

FRONT EDGE OF HORIZONTAL

DRAIN PAN

Figure 5. Left-Hand Discharge Configuration

10. From the upload position, flip cabinet 90º to the left and set into place. Replace coil assembly. Replace coil assembly. Install drain pan between exterior inner wall and tab as illustrated in Figure 3, Detail C.

11. (-068 Model Only) Install the horizontal shield on the front edge of the horizontal drain pan as shown in figure 5.

NOTE - For horizontal applications in high humidity areas, remove the downflow rail closest to the drain pan. To remove rail, remove screw from rail at back of unit and at cabinet support rail. Remove downflow rail then replace screws. Also, seal around the exiting drain pipe, liquid and suction lines to prevent infiltration of humid air.

12. Knock out drain seal plate from access door. Secure plate to cabinet front flange with screw provided.

13. Flip access door and replace it on the unit.

14. Set unit so that it is sloped 1/4 inch (6.35mm) toward the drain pan end of the unit. Connect return and supply air plenums as required using sheet metal screws.

15. If suspending the unit, it must be supported along the entire length of the cabinet. If using chain or strap, use a piece of angle iron or sheet metal attached to the unit (either above or below) so that the full length of the cabinet is supported. Use securing screws no longer than 1/2 inch (12.7mm) to avoid damage to coil or filter as illustrated in Figure 4 on page 17. Connect return and supply air plenums as required using sheet metal screws.

DOWNFLOW APPLICATION

Use the following procedures to configure the unit for downflow operations:

CAUTION

If electric heat section with circuit breakers (ECB29/ECB31) is applied to downflow CBX32MV unit, the circuit breakers must be rotated 180° to the UP position. See ECB29/ECB31 installation instructions for more details.

Table 2 outlines the sizes of the various drip shields.

NOTE — (-068 Model Only) Remove access panels and horizontal drip shield from the corrugated padding between the blower and coil assembly.

NOTE — Discard the corrugated padding and the downflow drip shields from the foam pads on top of the unit. (The shields are used for downflow applications only.)

1. Remove the coil assembly from the unit.

2. For best efficiency and air flow, remove the horizontal drain pan from the units in downflow positions as illustrated in figure 6 on page 19.

3. Rotate cabinet 180º from the upright position. See figure 6. You may need to first remove the blower assembly to lighten the cabinet for lifting.

4. Foam tape that is provided creates a seal between the drip shield and the coil so that water does not leak into the air stream. The foam tape pieces are precut. Apply the tape to the drip shields as illustrated in figure 7 and specified as follows:

 Apply two pieces of foam tape provided down both

ends of each shield. The tape should measure 4-3/4” X 2” (120 X 25 mm). Ensure that the tape covers both sides of the shield equally.

 Apply the longer piece of 1‐inch wide foam tape

between the end pieces of tape.

5. From the underside of the coil, install the downflow drip shield firmly in place as illustrated in figure 8.

Table 2. Downflow Drip Shields (Tape Required)

Units

-018/024 Not Required Not Required

-024/030 15-7/8” 4-11/16”

-036 17-7/8” 4-11/16”

-048, -060, and -068 19-7/8” 4-11/16”

Length Width

CBX32MV

Page 18

SIDE

VIEW

HORIZONTAL DRAIN PAN

UP-LOAD /

DOWNFLOW

DRAIN PAN

Figure 6. Downflow Discharge Position

DRIP SHIELD

2” WIDE FOAM TAPE

(REMOVE FROM UNIT)

AIR

HANDER

UNIT

COMBUSTIBLE FLOOR

PROPERLY SIZED

FLOOR OPENING

ADDITIVE BASE

Figure 9. Combustible Flooring Additive Base

8. For downflow installation on combustible flooring, an additive base must be used as illustrated in figure 9 on page 19.

9. Cut an opening appropriately sized for combustible base. Base dimensions are illustrated in figure 10. After opening has been cut, set the additive base into opening. Connect outlet air plenum to the additive base. Set the unit on the additive base so flanges of the unit drop into the base opening and seal against the insulation strips. The unit is now locked in place. Install return air plenum and secure with sheet metal screws.

1‐5/8 (41)

TOP VIEW

1” WIDE FOAM TAPE (LONGER PIECE)

Figure 7. Applying Foam Tape to Drip Shield

COIL

DRIP SHIELD

DRIP PAN

Figure 8. Downflow Drip Shields

6. Replace the coil assembly and blower if you have removed it. Replace the coil access panel.

7. Set the unit so that it is level. Using sheet metal screws, connect the return and supply air plenums as required.

NOTE - For downflow application, metal or class I supply and return air plenums must be used.

11‐3/8

1‐5/8 (41)

5/8 (16)

(289)

-018/-024 15 (381)

-024/-030 AND UP 20 (508)

SUPPLY AIR OPENING

24 (610) -068 ONLY

22‐1/8 (562) OTHER MODELS

13‐3/8 (340)

OPENING

SIDE VIEW

-018/-024 08-1/4 (464)

-024/-030 and up 23-1/4 (591)

INCHES (MM)

2 (51)

Figure 10. Downflow Combustible Base Dimensions

Brazing Connections

WARNING

Polyol ester (POE) oils used with HFC-410A refrigerant absorb moisture very quickly. It is very important that the refrigerant system be kept closed as much as possible. DO NOT remove line set caps or service valve stub caps until you are ready to make connections.

Page 19

CBX32MV

WARNING

Danger of fire. Bleeding the refrigerant charge from only the high side may result in the low side shell and suction tubing being pressurized. Application of a brazing torch while pressurized may result in ignition of the refrigerant and oil mixture - check the high and low pressures before unbrazing.

IMPORTANT

To prevent the build up of high levels of nitrogen when purging, be sure it is done in a well ventilated area. Purge low pressure nitrogen (1 to 2 psig) through the refrigerant piping during brazing. This will help to prevent oxidation and the introduction of moisture into a system.

CBX32MV

Page 20

PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING

OPERATIONS ON PAGE 10 BEFORE PROCEEDING.

USE A WET RAG TO PROTECT CTXV

SENSING BULB WHEN BRAZING SUCTION LINE CONNECTIONS.

NOTE — REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR REFRIGERANT PIPING SIZE REQUIREMENTS.

NOTE - Use silver alloy brazing rods with five or six percent minimum silver alloy for copper-to-copper brazing, 45 percent alloy for copper-to-brass and copper-to-steel brazing.

REMOVE ACCESS PANEL

REMOVE RUBBER PLUG FROM BOTH LIQUID

AND SUCTION LINES

NOTE — CBX32MV SERIES UNITS USE NITROGEN OR DRY AIR AS A HOLDING CHARGE. IF THERE IS NO PRESSURE WHEN THE RUBBER PLUGS ARE REMOVED, CHECK THE COIL FOR LEAKS BEFORE INSTALLING.

EITHER REMOVE OR PUSH PIPE WRAPPING BACK

THROUGH HOLE IN PIPING PLATE BEFORE LINE SET CONNECTION AND BRAZING.

LOW

PIPING PLATE

HIGH

CONNECT PIPES

NOTE — REFRIGERANT LINE SETS SHOULD BE ROUTED TO ALLOW FILTER ACCESSIBILITY.

REPEAT PREVIOUS PROCEDURE FOR LIQUID

LINE.

FLOW REGULATED NITROGEN (AT 1 TO 2 PSIG) THROUGH THE REFRIGERATION GAUGE SET INTO THE VALVE STEM PORT CONNECTION ON THE OUTDOOR UNIT LIQUID LINE SERVICE VALVE AND OUT OF THE VALVE STEM PORT CONNECTION ON THE SUCTION SERVICE VALVE.

PLACE A WET RAG AGAINST PIPING

PLATE AND AROUND THE SUCTION LINE CONNECTION. A

BRAZE CONNECTION. ALLOW PIPE TO

COOL BEFORE REMOVING WET RAG FROM CTXV SENSING BULB AND PIPING PANEL AREA.

CONNECT GAUGES AND

START NITROGEN FLOW

NITROGEN

REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR LEAK TESTING, EVACUATING AND CHARGING PROCEDURES

Figure 11. Brazing Connections

Page 21

CBX32MV

WARNING

When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).

Condensate Drain Requirements

IMPORTANT

CAUTION

Brazing alloys and flux contain materials which are hazardous to your health.

Avoid breathing vapors or fumes from brazing operations. Perform operations only in well ventilated areas.

Wear gloves and protective goggles or face shield to protect against burns.

Wash hands with soap and water after handling brazing alloys and flux.

Table 3. CBX32MV Refrigerant Connections and Line

Set Requirements

Models

-018/024

-024/030 and -036

-048

-060

-068

NOTE — Some applications may require a field provided 7/8” to 1-1/8” adapter

Liquid Line

3/8” (10mm)

NOTE - When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance.

Vapor / Suction Line

5/8” (16mm)

3/4” (19mm)

7/8” (22mm)

1-1/8” (29mm)

L15 Line Set

L15 line set sizes are dependent on unit matchups. See CBX32MV Product Specification bulletin to determine correct line set sizes.

Field-fabricated

MAIN DRAIN

Connect the main drain and route downward to drain line or sump. Do not connect drain to a closed waste system. See Figure 13 for typical drain trap configuration.

OVERFLOW DRAIN

It is recommended that the overflow drain is connected to a overflow drain line for all units. If overflow drain is not connected, it must be plugged with provided cap.

For downflow orientation, the overflow drain MUST be connected and routed to a overflow drain line. See Figure 13 for main and overflow drain locations based on coil orientation.

LEFT-HAND AIR

DISCHARGE

OVERFLOW

DRAIN ON LEFT

UPFLOW OR DOWNFLOW

RIGHT-HAND AIR

DISCHARGE

MAIN DRAIN ON

RIGHT

Figure 12. Main and Overflow Drain Locations based

on Coil Orientation

BEST PRACTICES

The following best practices are recommended to ensure better condensate removal:

 Main and overflow drain lines should NOT be smaller

than both drain connections at drain pan.

 Overflow drain line should run to an area where

homeowner will notice drainage.

 It is recommended that the overflow drain line be

vented and a trap installed. Refer to local codes.

CBX32MV

Page 22

ABOVE

FINISHED

SPACE?

OVERFLOW DRAIN LINE

ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TO ROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGE OVERFLOW SWITCH KIT. WIRE KIT TO SHUT DOWN COMPRESSOR PER INSTRUCTIONS.

LENNOX #

X3169

COMPACT OVERFLOW SWITCH WITH 3/4” FEMALE SLIP INLET

AND MALE ADAPTER, TWO PART DESIGN FOR USE WHERE OBSTRUCTIONS PREVENT DIRECT THREADING

CLEAN OUT

PRESS IN

(DO NOT GLUE)

VENT MUST EXTEND

ABOVE HEIGHT OF

COIL DRAIN PAN BY

TWO INCHES (51MM)

VENT

MAIN

DRAIN

CUT TO

REQUIRED

LENGTH

PROVIDED

PIPE NIPPLE

SIDE VIEW

FOR NEGATIVE PRESSURE COILS (BLOWER AFTER COIL) TRAPS ARE REQUIRED ON ALL DRAIN LINES CONNECTED TO COIL.

AIR HANDLER DRAIN PAN

OVERFLOW

DRAIN

YES

NOTE — WHEN A AIR HANDLER IS LOCATED

ABOVE A FINISHED SPACE THE SECONDARY DRAIN PAN MUST HAVE A LARGER FOOTPRINT THAN THE AIR HANDLER.

DRAIN

SECONDARY

DRAIN PAN

WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A 3/4” (19.1MM) SECONDARY DRAIN LINE MUST BE:

 CONNECTED TO SECONDARY DRAIN PAN

 CONNECTED TO THE OVERFLOW DRAIN OUTLET OF

THE AIR HANDLER DRAIN PAN.

TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES — GENERALLY, TWO INCHES (51MM).

LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90.

PIPE NIPPLE PROVIDED IN BAG ASSEMBLY - SCH 80, 3/4” I. D. X 5” - 34K7401 (1): CUT THE PIPE IN HALF AND USE IT TO ROUTE THE MAIN DRAIN.

1” X 3/4” X 3/4”

REDUCING

TEE WITH

PLUG

LENNOX

P-TRAP

49P66, J-TRAP #

91P90 OR ANY

PVC SCH 40 P- OR

J-TRAP 3/4”

Figure 13. Typical Main and Overflow Drain Installations

Inspecting and Replacing Filters

IMPORTANT

Filter access door must be in place during unit operation. Excessive warm air entering the unit from unconditioned space may result in water blow-off problems.

Unit Model No. Filter Size Inches (mm)

-018/024 15 X 20 x 1(381 x 508 x 25)

-024/030 20 x 20 x 1(508 x 508 x 25)

-036 20 x 20 x 1(508 x 508 x 25)

-048 and -060 20 x 24 x 1(508 x 610 x 25)

-068 20 x 25 x 1(508 x 635 x 25)

Table 4. Filter Dimensions

2”

(51MM)

TRAP DEPTH

TO APPROVED

DRAIN

DRAIN LINE SHOULD SLOPE A MINIMUM OF ONE INCH PER 10 FEET (25MM PER 3 METERS)

Filters may be duct-mounted or installed in the cabinet. A filter is installed at the factory. Note that filter access door fits over access panel. Air will leak if the access panel is placed over the filter door.

Filters should be inspected monthly and must be cleaned or replaced when dirty to assure proper furnace operation.

To replace filter:

1. Loosen the thumbscrews holding the filter panel in place.

2. Slide the filter out of the guides on either side of cabinet.

3. Insert new filter.

4. Replace panel.

See Table 4 for replacement filter sizes.

Sealing the Unit

WARNING

There must be an airtight seal between the bottom of the air handler and the return air plenum. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the air handler cabinet to ensure a tight seal. Return air must not be drawn from a room where this air handler or any gas-fueled appliance (i.e., water heater), or carbon monoxide-producing device (i.e., wood fireplace) is installed.

Seal the unit so that warm air is not allowed into the cabinet. Warm air introduces moisture, which results in water blow-off problems. This is especially important when the unit is installed in an unconditioned area.

Page 23

CBX32MV

Make sure the liquid line and suction line entry points are sealed with either the provided flexible elastomeric thermal insulation, or field provided material (e.g. Armaflex, Permagum or equivalent). Any of the previously mentioned materials may be used to seal around the main and auxiliary drains, and around open areas of electrical inlets.

Field Control Wiring

WARNING

Electric Shock Hazard.

Can cause injury or death.

Foil‐faced insulation has conductive characteristics simi lar to metal. Be sure there are no electrical connections within a ½” of the insulation. If the foil‐faced insulation comes in contact with electrical voltage, the foil could pro vide a path for current to pass through to the outer metal cabinet. While the current produced may not be enough to trip existing electrical safety devices (e.g. fuses or cir cuit breakers), the current can be enough to cause an electric shock hazard that could cause personal injury or death.

Wiring must conform to the current National Electric Code ANSI/NFPA No. 70, or Canadian Electric Code Part I, CSA Standard C22.1, and local building codes. Refer to following wiring diagrams. See unit nameplate for minimum circuit ampacity and maximum over-current protection size.

Select the proper supply circuit conductors in accordance with Tables 310-16 and 310-17 in the National Electric Code, ANSI/NFPA No. 70 or Tables 1 through 4 in the Canadian Electric Code, Part I, CSA Standard C22.1.

Separate openings have been provided for 24V low voltage and line voltage. Refer to the dimension illustration for specific location.

CAUTION

USE COPPER CONDUCTORS ONLY.

Wiring connections

1. Install line voltage power supply to unit from a properly-wired circuit breaker.

2. Ground unit at unit disconnect switch or to an earth ground.

NOTE - Connect conduit to the unit using a proper conduit fitting. Units are approved for use only with copper conductors. A complete unit wiring diagram is located on the back side of the unit's access panel.

3. Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit.

NOTE - For proper voltages, select control wiring gauge per the charts on page 28.

WARNING

Run 24V Class II wiring only through specified low voltage opening. Run line voltage wiring only through specified high voltage opening. Do not combine voltage in one opening.

CBX32MV

Page 24

Air Handler or Furnace Control

Heat Pump or Air Conditioner Control

i−

iComfortt

THERMOSTAT

i−

OUTDOOR UNIT

i−

THERMOSTAT

i−

Outdoor sensor for outdoor temperature display

OUTDOOR AIR SENSOR

(Optional).

Figure 14. Control (Field) Wiring — Communicating System (iComfortt thermostat)

Page 25

CBX32MV

AIR CONDITIONER UNIT (TWO-STAGE)

BROWN

YELLOW

BLUE

BLACK

RED

CBX32MV

COMFORTSENSE  7000

AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 20 FOR HEAT SECTION CONFIGURATION.

CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE

COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2. RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE 7000 CATALOG# Y2081).

L CONNECTION WIRED ON UNITS WITH LSOM.

IMPORTANT — USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 19, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE AC

DO NOT CUT ON-BOARD LINK R -O.

CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.

Figure 15. Control (Field Wiring) — Cooling Application (Non-Communicating)

AIR HANDLER

CONTROL

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

HEAT PUMP

UNIT

(TWO-STAGE)

OUT

CBX32MV

W1 W1

Figure 16. Control (Field Wiring) — Heat Pump (Non-Communicating)

COMFORTSENSE

 7000

Y2Y2

O. D.

SENSOR

(X2658)

X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR

TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP AND DUAL FUEL BALANCE POINTS.

CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT

# 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2. RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE 7000 CATALOG# Y2081).

FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON

HEAT PUMP TO Y2 ON CX32MV.

IMPORTANT — USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 19, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE HP

CUT ON-BOARD LINK R -O.

CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

CBX32MV

Page 26

OUTDOOR SENSOR (X2658)

RED

FAN RELAY

PUR

BLK

PUR

EDA UNIT

YEL

BLU

BLK

BRN

CBX32MV

OUTDOOR UNIT

NOTES -

NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM

/1\

NOT REQUIRED WITH SINGLE‐SPEED OUTDOOR FAN

/2\

NOT REQUIRED FOR SINGLE STAGE

/3\

AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL

JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 20 FOR HEAT SECTION CONFIGURATION.

CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2. RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE 7000 CATALOG# Y2081).

COMFORTSENSE 7000 THERMOSTAT

CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION

IMPORTANT — USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 19, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

CUT ON-BOARD LINK Y1-Y2 FOR TWO-

DO NOT CUT ON-BOARD LINK R -O.

STAGE A/C

TERMINAL IS USED.

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

Figure 17. Control (Field Wiring) — Cooling Application (Humiditrol

Relay Wiring) Non-Communicating

OUTDOOR UNIT

FAN RELAY (NOT REQUIRED WITH SINGLE−SPEED OUTDOOR FAN)

RED

PURPLE

BLACK

YELLOW

BLUE

BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM

BLUE (NOT REQUIRED FOR SINGLE STAGE)

IMPORTANT — USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 19, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

RED

BLACK

PURPLE

CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C ONLY

CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION

CBX32MV

and Second-Stage Outdoor Fan

COMFORTSENSE 7000 THERMOSTAT

OUTDOOR

SENSOR

(X2658)

2-STAGE

COMPR

CUT ON-BOARD LINK R -O.

TERMINAL IS USED.

DEHUM

HARMONY

Y1-Y2

R-O

HEAT

PUMP

R-DS

CUT FOR OPTION

Figure 18. Control (Field Wiring) — Heat Pump Application (Humiditrol

Fan Relay Wiring) Non-Communicating

Page 27

and Second-Stage Outdoor

CBX32MV

SENSOR CONNECTIONS AND WIRING REQUIREMENTS

The following are sensor connections and wiring requirements for the discharge air and outdoor air sensors.

Discharge Sensor (DAT)

The Air Handler Control has two screw terminals marked Discharge Air Sensor. The sensor is REQUIRED for EVENHEAT operation and is field installed and ordered separately using Lennox Catalog # 88K38.

In the EVENHEAT mode, the discharge air sensor cycles the electric heating elements as needed to maintain the Air Handler control EVENHEAT jumper selected discharge setpoint.

The discharge air sensor should be mounted downstream of the electric heat elements as illustrated in Figure 26, Detail A. It must be placed in a location with unobstructed airflow, where other accessories (such as humidifiers, UV lights, etc.) will not interfere with its accuracy.

Wiring distance between the Control and the discharge air sensor should not exceed 10 feet (3 meters) when wired with 18-gauge thermostat wire.

Outdoor Air Sensor

This is a two screw terminal for connection to a Lennox X2658 outdoor temperature sensor. The Control takes no action on the sensor status other than to communicate the temperature to the RSBus network. Wiring distance between the Control and outdoor temperature sensor should not exceed 200 feet when wired with 18-gauge thermostat wire.

 Minimum temperature: -40ºF (-40ºC)  Maximum temperature: 70ºF (158ºC)

AIR HANDLER CONTROL 9-PIN CONNECTOR (P8)

1. Air Handler (no electric heat) — Two wire factory harness (wired to pins 7 and 8) which provides 230 VAC power to Air Handler Control.

2. Air Handler (with electric heat) — Eight wire factory harness (all pin positions are wired as noted in Table 5).

NOTE - See Figure 26, Detail B for wire colors.

Table 5. Electric Heat Connection (P8)

Position Function / Description

1 Heat stage 1 relay coil

2 Heat stage 2 relay coil

3 Relay coil return

4 Heat stage 3 relay coil

5 Heat stage 4 relay coil

6 Heat stage 5 relay coil

7 L1 230VAC supply from heater kit

8 L2 230 VAC supply from heater kit

9 Not Used

CONTROL CONNECTIONS AND WIRING REQUIREMENTS

This sections provides information on communicating and non-communicating control connections and wire run lengths.

Table 6. Air Handler Control Connections —

Communicating

Label Label Function

R 24VAC

Thermostat

Outdoor Unit

Link

i+ RSbus data high connection

i- RSbus data low connection

C 24VAC command (ground)

R 24VAC

i+ RSbus data high connection

i- RSbus data low connection

C 24VAC command (ground)

Not used.

Table 7. Run Length — Communicating

Wire Run Length AWG # Insulation/Core Types

Maximum length of wiring for all connections on the RSbus is limited to 1500 feet (457 meters).

Color-coded, temperature rating 95 solid core. (Class II Rated Wiring)

F (35ºC) minimum,

CBX32MV

Page 28

Table 8. Air Handler Control Connections

Function

Indoor Control Terminal Label

W1 (Input)

W2 (Input)

W3 (Input)

Y1 & Y2 (Input/

Output)

G (Input)

R The R terminal shall be capable of providing the power to the thermostat and all the associated loads.

O (Input/Output)

DS (Input)

DH (Output) The DH terminal provides a 24VAC output for dehumidification needs in communicating systems.

H (Output) The H terminal provides a 24VAC output for humidification needs in both communicating and non-communicating mode.

L (Input)

Non-Communicating

Room Thermostat

(Indoor and Outdoor -24 volts)

Indicates a first-stage heating demand. This input is an anticipator for the ther mostat. Indicates a second-stage heating de mand. W1 input must be active to recog nize second-stage heat demand. Indicates a third-stage heating demand. W1 and W2 inputs must be active to rec ognize third-stage heat demand. Room thermostat inputs 24 volts to the Y1 and Y2 terminals on the indoor con trol. The 24 volt signal is then passed through to the outdoor unit. During a second-stage demand, both Y1 and Y2 are active. The Y1 terminal is connected to Y2 by link (Solid jumper on control that would be cut for 2 stage applica tions)

Indicates a 24 volt indoor blower de mand.

The C terminal shall interconnect the signal ground of the room thermostat with secondary transformer ground (TR) and chassis ground (GND)

Room thermostat inputs 24 volts to the O terminal on the indoor control. The O terminal is connected to R by link (Solid jumper on control that would be cut if unit was a heat pump)

Used for Harmony III zoning systems, or thermostat with dehumidification capa bility. The DS terminal is connected to R by link (Solid jumper on control that would be cut if for the above applica tions). Harmony III control - This will allow the control to vary the voltage signal to the indoor blower motor to control required CFM. Dehumidification - Allow a 24 volt sig nal on the DS to turn off and on the dehu midification mode.

The L terminal is provided for connection to devices with Lennox System Operation Monitor (LSOM) capabilities. The control interprets the fault signals and transmits them as an alarm message on the communication line. There are ten (10) identified LSOM fault codes. Each is mapped to the communication Alarm codes.

Indoor Communicating

Outdoor Non-Communicating

N/A N/A

The room thermostat communicated with the indoor control. The indoor con trol outputs 24 volts on its Y1 and Y2 terminals which are hard wired to the non-communicating outdoor unit.

In a communicating system, ”G” input to indoor control is used by non-communi cating IAQ devices (such as LVCS, HRV or ERV) to ensure indoor blower de mand.

The room thermostat communicated with the indoor control. The indoor con trol outputs 24 volts on its O terminals which are hard wired to the non-com municating outdoor unit. If there is 24 volts on O, the reversing valve will be energized and the outdoor unit will run in the cooling mode. If O does not have 24 volts, the outdoor unit will run in heating mode.

N/A N/A

Full Communication

(Indoor & Outdoor)

In a full communicating system, no wiring is required on Y1 and Y2 termi nals.

In communicating system “G” input to indoor control is used by non-communi cating IAQ devices (such as LVCS, HRV or ERV) to ensure indoor blower de mand.

In a full communicating system, O termi nal is not wired.

Table 9. Run Length — Non-Communicating

Wire Run Length AWG # Insulation/Core Types

Less than 100' (30m) 18

More than 100' (30m) 16

Color-coded, temperature rating 95ºF (35ºC) minimum, solid core. (Class II Rated Wiring)

Page 29

CBX32MV

JUMPER & LINK GUIDE

COOLING MODE

BLOWER SPEED

(COOLING & HP MODE)

HIGH

SPEED

MEDIUM-HIGH

SPEED

MEDIUM-LOW

SPEED

LOW

SPEED

HEATING MODE

BLOWER SPEED

(ELECTRIC HT MODE)

HIGH

SPEED

MEDIUM-HIGH

SPEED

MEDIUM-LOW

SPEED

LOW

SPEED

PUSH

BUTTON

ON-BOARD LINK

OPTION SELECTION

2-STAGE

(JUMPERS Y1 to Y2)

COMPRESSOR LINK

HEAT PUMP LINK

(JUMPERS R to O)

HARMONY LINK

(JUMPERS R to DS)

DEHUMIDIFICATION-

1-STG COMPRESSOR

Y1-Y2

DO NOT CUT

COMPR

2 STAGE

A/C UNIT

DO NOT CUT

R-0

HEAT

NO HARMONY ZONING

OR NO

COMFORTSENSE 7000

W/ DS CONNECTION

DO NOT CUT

PUMP

R-DS

DEHUM

2-STG COMPRESSOR

Y1-Y2

2 STAGE

HEAT PUMP UNIT

CUT LINK

HARMONY ZONING

C0MFORTSENSE 7000

W/ DS CONNECTION

CUT LINK

HARMONY

CUT LINK

COMPR

R-0

HEAT

PUMP

R-DS

DEHUM

HARMONY

FUSE 3 AMP

XFMR24V

24 VAC

COM

XFMR LINE

EARTH

INDOOR BLOWER SIGNAL

456 12 3

BLOWER

ADJUST SELECTION

NORMAL

NORM

(+ 10%)

SETTING

NORM

(-10%)

SETTING

NORM+-

HEAT

1234

COOL

1234

DELAY

INDOOR BLOWER POWER

I +

1234

ADJUST

NORM +

I + I -RC

OUTDOOR UNIT

I -

LINK

COOLING BLOWER RAMPING

(COOLING MODE UNLESS NOTED)

DELAYPROFILE #4

OFF-50%-82%100%-50%-OFF

PROFILE #3

DELAY

OFF-82%-100%-OFF

DELAY

PROFILE #2

CLG

OFF  100%  DEMAND SATISFIED  100% FOR 45 SECONDS  OFF

OFF  30 SECOND DELAY  100%  DEMAND SATISFIED  100% FOR 45 SECOND  OFF

DELAY

PROFILE #1

OFF-100%-OFF

HUMIDITROL

HUMIDIFICATION

SMART

EVENHEAT

BLOWER

ONLY CFM

1234

I + I -RC

THERMOSTAT

7-SEGMENT LED

AUTO

100

115

Y1-Y2

130

OUTDOOR

AIR SENSOR

2-STAGE

COMPR

R-O

HEAT

PUMP

DISCHARGE

AIR SENSOR

CONTINUOUS FAN

BLOWER SPEED

HIGH SPEED (100%)

MEDIUM-HIGH

SPEED

(70%)

* MEDIUM-LOW

SPEED

(38%)

LOW

SPEED

(28%)

R-DS

DEHUM

HARMONY

-CUT ON-BOARD LINK (SOLDER TRACE) COMPLETELY

THROUGH BOTH LAYERS ON THE CONTROL BOARD

IMPORTANT: USE CARE WHEN CUTTING LINKS TO

PREVENT DAMAGE TO CONTROL.

FACTORY

JUMPER

STANDARD HEAT MODE

(DEFAULT)

STANDARD

HEAT MODE

(STAGED BY TSTAT)

EVENHEATER MODE

-ENABLED WITH OPTIONAL DISCHARGE AIR SENSOR

DEGREE TARGET

DISCHARGE

TEMPERATURE

100 DEGREE TARGET

115 DEGREE TARGET

130

DEGREE

TARGET

* INDICATES FACTORY DEFAULT SETTING

110

115

130

110

115

130

110

115

130

110

115

130

110

115

130

HUMIDIFICATION MODE

HUMIDIFICATION MODE 24VAC OUTPUT ON ”H”

FOR HUMIDIFIER OR

ACCESSORY INTERLOCK

SMART MODE

- ”H” ENABLED WHEN HEAT ACTIVE

(HP or ELECT. HT)

AUTO MODE

- ”H” ENABLED WHEN

BLOWER ACTIVE

& NO CLG OR DEHUM

SMART

AUTO

CBX32MV

Figure 19. Air Handler Configuration

Page 30

Air Handler Control Button, Display and Jumpers

Use Figure 19 as reference for jumper settings. If any of the referenced jumpers are missing, the Air Handler Control will display Error Code 130 as per Table 10, and the Air Handler Control will automatically use the factory default settings shown in Figure 19)

IMPORTANT

Before changing any clippable links or jumper settings, make sure the motor has completely stopped. Any changes will not take place while the motor is running.

PUSH BUTTON

An on-board push button is provided for the purpose of placing the Air Handler Control in different operation modes and can be used to recall stored error codes. When button is pushed and held, Air Handler Control will cycle through a menu of options depending on current operating mode. Every three seconds a new menu item will be displayed. If the button is released while that item is shown on the display, Air Handler Control will enter displayed operating mode, or execute defined operation sequence for that menu option. Once all items on menu have been displayed the menu resumes from the beginning (if button is still held).

1. Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. Release the button when the desired mode is displayed.

When the solid “E” is displayed, the control enters the Error

Code Recall mode. Error Code Recall mode menu options: No change

3. (displaying error history) remains in Error Code Recall mode;

solid “” exits Error Code Recall mode; and solid “c” clears the error history. Must press button while flashing “c” is displayed to clear error codes

4. When the solid “-” is displayed, the control enters the error

recall mode. The error recall menu options: Solid “C” starts pressure switch calibration; blinking “-” exits current active mode.

JUMPERS

Jumpers are used for non-communicating mode only.

1. Humidification — Controls the status of H terminal on the thermostat block. Configurations are as follows:

 If jumper is installed in SMART Humidification

position (Default), H terminal is active if heat demand is present and indoor blower is running.

 If jumper is installed in AUTO Humidification

position, H terminal is energized whenever indoor blower is running.

2. EvenHeat — Target Discharge Air Temperature selection is used to set discharge air temperatures for EvenHeat operation.

NOTE - Optional Discharge Air Temperature Sensor, Lennox Catalog # 88K38 is REQUIRED for EVENHEAT operation and must be ordered separately.

3. Blower Only CFM — Used to select Indoor blower

CFM for continuous operation.

4. Heat — Used to select Indoor blower CFM for electrical

heat by placing the jumper in proper position. Actual CFM values for different air handler sizes are shown starting on page 3.

5. Cool — Used to select cooling indoor blower CFM by

placing the jumper in proper position. Actual CFM values for different air handler sizes are shown starting on page 3.

6. Adjust - Used to select the indoor blower CFM

adjustment value by placing the jumper in the appropriate position.

 If NORM is selected, indoor blower runs at

normal speeds.

 If + is selected, indoor blower runs at

approximately 10% higher speed than NORM setting.

 If - is selected, indoor blower runs at

approximately 10% lower speed than NORM setting.

If the jumper is missing, the Air Handler Control will activate the Configuration Jumper is Missing alarm in and will automatically use the default factory setting in Table 10. See Figure 19 for jumper configurations. Actual CFM values for different air handler sizes are shown starting on page 3.

7. Delay — Indoor blower cooling profile, delay for

cooling and heat pump operations.

 For heat pump heating operation only delay

profiles 1 and 2 are applicable. If profiles 3 or 4 have been selected, heat pump operation will use profile 1 only.

 For heat pump cooling operation all 4 profiles

are operational.

If the jumper is missing, the Air Handler Control will activate the Configuration Jumper is Missing alarm and will automatically use the default factory setting in Table

10. See Figure 19 for jumper configurations.

Delay Profile 1

A When cool or heat demand is initiated, motor

ramps up to 100% and runs at 100% until demand is satisfied.

B Once demand is met, motor ramps down to stop.

100

%CF

M COOLING DEMAND

OFFOFF

Page 31

CBX32MV

Delay Profile 2

Cooling — Air Conditioner and Heat Pump:

OFF

100% CFM

COOL ING

DEMAND

100% CFM

45 SEC.

A When cool demand is initiated, motor ramps up to

100% and runs at 100% until demand is satisfied.

B Once demand is met, motor runs at 100% for 45

seconds.

C Motor ramps down to stop.

Heating — Heat Pump only:

OFF

30 sec

delay

HEATING DEMAND

100% CFM

45 SEC.

A When heat demand is initiated, 30 seconds motor

on delay starts

B After the motor on delays expires, motor ramps up

to 100% and runs at 100% until demand is satisfied.

C Once demand is met, motor runs at 100% for 45

seconds.

D Motor ramps down to stop.

Delay Profile 3

OFF

7 1/2 MIN

82%CFM

COOLING DEMAND

100% CFM

Table 10. AHC System Status Codes

OFF

A When cool demand is initiated, motor ramps up to

82%

B Motor runs at 82% for approximately 7.5 minutes

and then ramp up to 100% (unless the demand has been satisfied) and motor runs at 100% until demand is satisfied.

C Once demand is met, motor ramps down to stop

Delay Profile 4

OFF

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COOLING DEMAND

100% CFM

1/2 MIN 50% CFM

OFF

A When cool demand is initiated, motor ramps up to

50%

B Motor runs at 50% for 30 seconds and ramps up to

82%

C Motor runs at 82% for approximately 7.5 minutes

and then ramp up to 100% (unless the demand has been satisfied) and motor runs at 100% until demand is satisfied.

D Once demand is met, motor runs at 50% for 30

seconds.

E Motor ramps down to stop

DISPLAY

An on-board single character LED display (see Figure 19 for LED display location) indicates general system status information such as mode of operation, indoor blower CFM and error codes. Multi-character strings are displayed with character ON for one second, OFF for 0.5 seconds and one second pause between the character groups.

AHC Single Character

Display

Letter or Number



d F

Action

Unit Size Code displayed represents air handler model size and capacity. See Configuring Unit Size Codes in Figure

21.

If three horizontal bars are displayed, AHC does not recognize air handler model size and capacity. See Configuring

Unit Size Codes in Figure 21.

Idle mode (decimal point / no unit operation)

Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm setting for current mode displayed. Example: 

Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes). Example  or 

Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes)

Defrost mode. (Y, W and O call)

Heat Stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes. Example:

Variable Capacity Heat (1 second ON, 0.5 second OFF) / % of input rate displayed / Pause/ cfm setting / Pause/ Re peat codes. Example:  or 

Discharge air sensor temperature (indoor blower must be operating) 

 or  or 

CBX32MV

Page 32

Table 11. AHC Configuration, Test and Error Recall (Fault and Lockout) Function

NOTE — AHC MUST BE IN IDLE MODE)

Single Character LED

Display

Solid

Blinking

CONFIGURING ELECTRIC HEAT SECTIONS

Solid

INDOOR BLOWER TEST

Solid

CONFIGURING UNIT SIZE CODES

Single Character LED

Display

Solid

Blinking

Action

Push and hold button until solid appears, release button. Display will blink.

Push and hold button until required symbol displays.   or 

Release push button - control will cycle the indoor blower motor on to the selected heat speed and stage the electric heat relays on and off to automatically detect number of electric heat sections. Control will store the number of elec tric heat sections. Control will automatically exit current active mode.

Release push button - control cycles indoor blower on for ten seconds at 70% of maximum air for selected capacity size unit. Control will automatically exit current active mode.

Action

RELEASE push button - This mode allows the field to select a unit size code (number or letter) that matches the air

handler model size and capacity.

IMPORTANT — All field replacement controls may be manually configured to confirm air handler model size and capacity.

10 When the correct Unit Sized Code is displayed, RELEASE push button. Selected code will flash for 10 second

period.

10 During ten second period, HOLD push button until code stops blinking (three seconds minimum). 10 Air Handler Control will store code in memory and exit

the Unit Size Code will display for 2 to 5 seconds.

NOTE - If ten second period expires, or push button is held less than 3 seconds, control will automatically exit current active mode and go into IDLE Mode without storing unit size code. If this occurs, then Unit Size Code configuring procedure must be repeated.

current active mode. LED display will go blank and then

ERROR CODE RECALL MODE (NOTE — CONTROL MUST BE IN IDLE MODE)

Solid

Blinking



 

To enter Error Code Recall Mode — PUSH and HOLD button until solid E appears, then RELEASE button.

Control will display up to ten error codes stored in memory. If E000 is displayed, there are no stored error codes.

To exit Error Code Recall Mode — PUSH and HOLD button until solid three horizontal bars appear, then RELEASE button.

NOTE - Error codes are not cleared

To clear error codes stored in memory, continue to HOLD push button while the three horizontal bars are displayed. Release push button when solid c is displayed. Display will blink.

Push and hold for one (1) second, release button. Seven-segment will display 0000 and exit error recall mode.

Page 33

CBX32MV

Table 12. AHC Control Single Character Display Alert Codes (Communicating and Non-Communicating)

Alert

Code

E105

E114

E115

E120

E124

E125

E130

E131

E132

E180

E201

E202

E203

E292

E295

E310

E312

E313

Priority

Critical

Moder ate

Critical

Moder ate

Critical

Minor

Critical

Minor

Alert How to Clear

Equipment is unable to communicate. This may indicate the existence of other alarms

The air-handler has lost communica tion with the rest of the system.

There is a frequency/distortion problem with the power to the air-handler.

The 24VAC to the air-handler control .is lower than the required range of 18 to 30VAC.

There is a delay in the air-handler re sponding to the system.

The iComfort thermostat has lost communication with the air-handler for more than 3 minutes.

There is a hardware problem with the air-handler control.

An air-handler configuration jumper is missing.

The air-handler control parameters are corrupted.

The air-handler control software is cor rupted.

The iComfort thermostat has found a problem with the air-handler outdoor sensor.

The system has lost communication with the or air-handler indoor blower motor.

The unit size code for the air-handler and the size of blower motor do not match.

The unit size code for the air-handler has not been selected.

The air-handler's blower motor will not start.

The indoor blower motor is over heat ing.

There is a problem with air-handler dis charge air sensor.

The blower cannot provide the re quested CFM due to high static.

The indoor and outdoor unit capacities do not match.

/ codes. In most cases errors are related to electrical noise. Make sure high voltage power is separated from RSBus. Check for mis-wired and/or loose connections be tween the thermostat, indoor unit and outdoor unit. Check for a high voltage source of noise close to the system. Generally, this is a self-recoverable error.

This alarm/code may indicate transformer overloading. Check the voltage and line power frequency. Check the generator operating frequency, if the system is running on back-up power. Correct voltage and frequency problems. System resumes normal operation 5 seconds after fault recovered.

24-volt power low (range is 18 to 30 volts). Check and correct voltage. Check for addi tional power-robbing equipment connected to system. This alarm / code may require the installation of an additional or larger VA transformer.

Typically, this alarm/code does not cause any issues and will clear on its own. The alarm/code is usually caused by a delay in the outdoor unit responding to the thermo stat. Check all wiring connections. Cleared after unresponsive device responds to any inquiry.

Equipment lost communication with the iComfort thermostat. Check the wiring connections, ohm wires and cycle power. The alarm stops all associated HVAC op erations and waits for a heartbeat message from the unit that's not communicating. The alarm/fault clears after communication is re-established.

There is a control hardware problem. Replace the control if the problem prevents op eration and is persistent. The alarm/fault is cleared 300 seconds after the fault recov ers.

Configuration jumper(s) missing on control (applicable in non-communicating ap plications only). Replace the jumper or put wire between terminals on control. Cleared after jumper is connected.

Reconfigure the system. Replace the control if heating or cooling is not available.

Recycle power. If failure re-occurs, replace the control. System reset is required to recover.

In normal operation after control recognizes sensors, the alarm will be sent if valid temperature reading is lost. Compare outdoor sensor resistance to tempera ture./.resistance charts in unit installation instructions. Replace sensor pack if neces sary. At the beginning of (any) configuration, the air-handler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as installed and shown in the ’About’ screen. The alarm / fault will clear upon con figuration, or sensing normal values.

Lost communication with indoor blower motor. Possible causes include power out age, brown-out, motor not powered, loose wiring, condensation on air handler control without cover on breaker. Problem may be on control or motor side. Cleared after communication is restored.

Incorrect appliance unit size code selected. Check for proper configuring under unit size codes for air handler on configuration guide or in installation instructions. The alarm / fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming.

No appliance unit size code selected. Check for proper configuring under: Unit size codes for air handler on configuration guide or in installation instructions. Critical Alert. The alarm/fault clears after the correct match is detected following a reset. Re move the thermostat from the system while applying power and reprogramming.

The system will go into watchguard mode. Indoor blower motor unable to start. This could be due to seized bearing, stuck wheel, obstruction etc. Replace motor or wheel if assembly does not operate or meet performance standards. The alarm/fault clears after the indoor blower motor starts successfully.

Indoor blower motor over temperature (motor tripped on internal protector). Check motor bearings and amps. Replace if necessary. The alarm / fault clears after blower demand is satisfied.

Compare outdoor sensor resistance to temperature/resistance charts in installation instructions. Replace sensor if necessary. The alarm/fault is cleared 30 seconds after fault is detected as recovered.

Warning Only. Restricted airflow - Indoor blower is running at a reduced CFM (cut back mode). The variable-speed motor has pre-set speed and torque limiters to pro tect the motor from damage caused by operating outside of design parameters (0 to

0.8” e.g. total external static pressure). Check filter and duct system. To clear, replace filter if needed or repair/add duct. The alarm/fault is cleared after the current service demand is satisfied.

Check for proper configuring in installation instructions. Alarm is just a warning. The system will operate, but might not meet efficiency and capacity parameters. The alarm will clear after commissioning is complete.

CBX32MV

Page 34

Table 12. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (continued)

Alert

Code

E345

E346

E347

E348

E350

E351

E352

E353

E354

E355

E409

Priority

Critical

Moder ate

Alert How to Clear

The O relay on the air-handler has fai led. Either the pilot relay contacts did not close or the relay coil did not ener gize.

The R to O jumper was not removed on the air-handler control.

The Y1 relay on the air-handler has failed. Either the pilot relay contacts did not close or the relay coil did not ener gize.

The Y2 relay on the air-handler has fai led. Either the pilot relay contacts did not close or the relay coil did not ener gize.

The air-handler's electric heat is not configured.

There is a problem with the air-han dler's first stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize.

There is a problem with the air-han dler's second stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on first stage electric heat until the issue is resolved.

There is a problem with the air-han dler's third stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on first stage electric heat until the issue is resolved.

There is a problem with the air-han dler's fourth stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on first stage electric heat until the issue is resolved.

There is a problem with the air-han dler's fifth stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will oper ate on first stage electric heat until the issue is resolved.

The secondary voltage for the air-hand ler has fallen below 18VAC. If this con tinues for 10 minutes, the iComfort thermostat will turn off the air-handler.

O relay failed. Pilot relay contacts did not close or the relay coil did not energize. Re place control. The alarm clears after a reset.

Configuration link(s) not removed on control. Cut / remove R to O jumper. Applicable with non communicating outdoor unit with communicating indoor unit. The fault clears after the R to O jumper is cut/removed.

Operation stopped. Y1 relay failed. Pilot relay contacts did not close or the relay coil did not energize. The indoor unit cannot verify that the relay is closed. The alarm clears after a reset and Y1 input sensed.

Operation stopped. Y2 relay failed. Pilot relay contacts did not close or the relay coil did not energize. The indoor unit cannot verify that the relay is closed. The alarm clears after a reset and Y2 input sensed.

Heat call with no configured or mis-configured electric heat. Configure electric heat in the air-handler. The fault clears electrical heat is successfully detected.

Heat section / stage 1 failed. Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The alarm clears after stage 1 relay is detected.

Heat section / stage 2 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will oper ate on stage 1 heat only. The alarm clears after stage 2 relay is detected.

Heat section / stage 3 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will oper ate on stage 1 heat only. The alarm clears after sage 2 relay is detected.

Heat section / stage 4 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will oper ate on stage 1 heat only. The alarm clears after stage 2 relay is detected.

Heat section / stage 5 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will oper ate on stage 1 heat only. The alarm clears after stage 2 relay is detected.

Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued. Check the indoor line voltage, transformer output voltage. The alarm clears after the voltage is higher than 20VAC for 2 seconds or after a power reset.

Page 35

CBX32MV

Configuring Unit

This section identifies the requirements for configuring the air handler unit for unit size, heat mode selection and EvenHeat.

Air Handler Control Checkout

Power-up - Unit Size Code (Number or letter) displayed represents air handler model size and capacity. If three horizontal bars displays, Air Handler Control does not recognize unit size code (air handler model size and capacity).

Finished

After all electric heat installations, Control must be manually configured to detect number of heat sections. Refer to Configuring/Detecting electric heat sections flow diagram, Air Handler or ECB40 Electric Heat installation

Refer to Heat Pump or Cooling Sequence of Operation flow diagrams, Air Handler or ECB40 Electric Heat installation instructions.

Electric

heat

Installed?

Yes

W1 Call?

Yes

YesNo

Standard

Control

recognizes

Unit Size

Code?

Which Heat

Mode?



No (Display Alarm

Code 203)

Refer to Configuring Unit Size Codes flow diagram, Air Handler or ECB40 Electric Heat installation instructions.

IMPORTANT — Field replacement controls may need to be manually configured to validate air handler unit size code.

EVENHEAT

Refer to EVENHEAT Operation flow diagram, Air Handler or ECB40 Electric Heat installation instructions.

NUMBER OF HEAT SECTIONS DETECTED

T-STAT CALL

RECOMMEND — USE FIGURE 19 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

ONE (H1)

TWO (H1-H2)

A call for electric heating first, second or third stage is initiated when 24 VAC (R) is detected on W1, W2 and W3 inputs on Control. (Factory mounted metal jumpers connect W1/2 and W2/W3.)

Indoor blower will immediately start to delivery CFM as set by heating mode jumper on AHC with activation of first electric heat pilot relay.

THREE (H1-H3)

FOUR (H1-H4)

H1 AND H2

FIVE (H1-H5)

H1 AND H2

H3 AND H4

Pilot relays on AHC are energized one at a time. There is a minimum of 10 seconds delay between pilot relay activations.

NOTE - Control will not recognize higher heat sections calls if lower heat section is not present.

At the completion of each heat section demand (W1, W2, and W3), the AHC will immediately de-energize the corresponding pilot relay(s).

NOTE — If the call for lower heat section is removed, Control will automatically de-energize higher heat sections.

At the completion of all heating demands, the indoor blower will run for an additional 10 seconds before de-energizing.

Figure 20. Air Handler Control Checkout

CBX32MV

Page 36

Configuring Unit Size Codes (Model Number)

Power-up — Unit Size Code (number or letter) displayed represents unit size code (air handler model size and capacity). If three horizontal bars display, then Air Handler Control (AHC) does not recognize unit size code.

To enter unit size code

configuration mode; PUSH and

HOLD button next to single

character LED display until dash

symbol appears, RELEASE button.

Solid dash starts blinking

on single character LED

PUSH and HOLD button until the solid P

symbol is displayed on the single

character LED display, then RELEASE

button. This mode allows the user to

select a unit size code (number or letter)

that matches the air handler model size

display.

and capacity.

Yes

(No heating, cooling or indoor fan operation)

AHC in IDLE mode

UNIT SIZE

CODE



Turn room thermostat to

OFF

AIR HANDLER

MODEL

CBX32MV-018/024

CBX32MV-024/030

CBX32MV-036

CBX32MV-048

CBX32MV-060

CBX32MV-068

CBX40UHV-024

CBX40UHV-030

CBX40UHV-036

CBX40UHV-042

CBX40UHV-048

CBX40UHV-060

IMPORTANT — Field replacement controls may need to be manually configured to validate air handler unit size code.

Solid P starts blinking

on single character

LED display.

PUSH and HOLD button to allow AHC to display unit size

(letter or number) for each different air handler model

code for three seconds.

Figure 21. Configure Unit Size Codes

1. When the correct Unit Sized Code is displayed, RELEASE

push button. Selected code will flash for 10 second period.

2. During that 10 second period, HOLD push button until code

stops blinking (three seconds minimum).

3. Air Handler Control will store code in memory and exit current

active mode. LED display will go blank and then the Unit Size

Code will display for 2 to 5 seconds.

NOTE - If 10 second period expires, or push button is held less than

three seconds, control will automatically exit current active mode and go into IDLE Mode without storing unit size code. If this occurs, then Unit Size Code configuring procedure must be repeated.

LED displays correct

Unit Size Code.

YES

Unit enters IDLE

Mode.

Page 37

CBX32MV

Configuring/Detecting Electric Heat Sections

IMPORTANT — All electric heat installations require the Air Handler Control (AHC) to be manually configured to detect number of heat sections.

NOTE — All field replacement AHC will require configuring/detecting electric heat sections.

RECOMMEND — USE FIGURE 19 AS A REFERENCE FOR SETTING

JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

Standard EVENHEAT

Which Heat

Mode?

 Set desired Heating Mode Blower Speed jumper

pin.

 Electric heat is stages by room thermostat. (AHC

comes with factory jumper between W1 to W2 and W2 to W3)

 Refer to Air Handler Control Checkout flow diagram for

operation.

Yes

To enter electric heat mode configuration, push and hold button next to single character LED display until dash symbol (solid bar) appears, then release button.

Solid dash starts blinking on single character LED display

 Set desired Heating Mode Blower Speed jumper

pin.

Configuration

AHC in Idle Mode

(No heating cooling or

indoor fan operation)

Push and hold button until the solid H symbol is displayed on the single character LED display, then release button.

 Install and wire discharge air temperature sensor.

 Set desired Target Discharge Temperature jumper

pin. If jumper pin is missing or discharge air temperature sensor is not detected, AHC defaults to Standard Heat Mode. Target settings are 85, 100, 115 and 130ºF) .

 Refer to EVENHEAT Operation flow diagram for

operation.

Turn room thermostat to OFF.

1. AHC will start the indoor blower motor to the selected heat jumper speed setting and cycle the electric heat relays ON to automatically detect number of electric heat sections. (Electric heat section may be wired to energize more than one element)

2. AHC waits for maximum of ten seconds to detect electric heat 22 volt DC relay coils are energizing:

A If relay coil current is detected within ten seconds,

each additional heat section is detected, single character LED display on the AHC will display that electric element number. (Example: Last number dis played by the single character LED display is 3, the AHC is configured to operate three electric heat sections.)

B If relay coil current is not detected within ten seconds,

3. AHC will automatically exit current active mode when configuration is completed. To verify that the number of electric sections detected matches the installed electric heat package, the field MUST CONFIRM that the last number the single character LED display before exiting the Configuring/Detection Mode matches the number of installed electric heat sections. AHC stores the number of electric heat stages in non-volatile memory.

4. After the detection is finished, unit will continue to operate for an additional 30 seconds.

NOTE — If AHC push button is pushed or power is cycled on AHC is unable to verify all 22 volt DC electric heat relay(s) were energized using electric heater detection, configuration will be stopped. Configuration function must be repeated.

AHC will show a 1 on the single character LED display indicating that the first stage has been detected. As

the AHC will exit the current active mode and resume operation with electric heat disabled.

Finished

Figure 22. Heat Mode Selection

CBX32MV

Page 38

INPUTS OUTPUTS

Room Thermostat Demand

Target Discharge Air Temperature Set at 85ºF

Y1 Heat Pump First Stage Heat Pump First Stage

Y1 + Y2

Y1 + W1 and/or W2

Heat Pump First and Second Stage

Heat Pump First Stage + First Electric Heat Section (H1)

Heat Pump First and Second

Y1 and Y2 + W1 and/or W2

Stage+ First Electric Heat Sec tion (H1)

W1 and/or W2 First Electric Heat Section (H1)

EVENHEAT OPERATION

Target Discharge Air Temperature Set at 100ºF

Heat Pump First and Second Stage + First Electric Heat Section (H1)

Heat Pump First Stage + First Electric Heat Section + Second Electric Heat Section (H2) if num ber of electric heater sections de tected is more than two.

Heat Pump First and Second Stage + First Electric Heat Section + Second Electric Heat Section (H2) if number of electric heater sections detected is more than two.

First Electric Heat Section (H1) + Second Electric Heat Section (H2) if number of electric heater sec tions detected is more than two.

Target Discharge Air Temperature Set at 115ºF/130ºF

Heat Pump First + First Electric Heat Section (H1)

Heat Pump First and Second Stage + First Electric Heat Section (H1) + Second Electric Heat Sec tion (H2) if number of electric heat er sections detected is more than two.

Heat Pump First Stage + First Electric Heat Section (H1) Second Electric Heat Section (H2) if num ber of electric heater sections de tected is more than two.

Heat Pump First and Second Stage + First Electric Heat Section (H1) Second Electric Heat Section (H2) if number of electric heater sections detected is more than two.

First Electric Heat Section (H1) + Second Electric Heat Section (H2) if number of electric heater sec tions detected is more than two.

Heat pump first or second stage or electric heat demand will start the Air Handler Control indoor blower at CFM value based on tables found in installation instructions.

Yes

Last room thermostat Heat

Timer delays for

120 seconds

Heat Pump and electric heat

demand?

One Stage More than one stage

Increase target discharge air temperature by 15Fº

up- staging action

Timer delays for 150

seconds

Figure 23. EVENHEAT Operation (1 of 2)

Page 39

CBX32MV

Note 1 Activation delay

 120 seconds if one heat stage is or deactivated

 150 seconds if more than one stage is activated or deacti

vated.

EVENHEAT Operation

Start Timer Delay

(Note 1)

Yes

Adjust Target

Discharge Air

Temperature

Delay Timer

Finished or last

change was up-

stage

Yes

Electric heat ON

Yes

W call with one

Electric Heat

Section ON

Above

Change in Heat

demand from

room thermostat?

Stop Delay Timer

Increase heat demand.

Y1 (with or without Y2) +

W1 and W2

Adjust Target Discharge Air

Temperature

Heat Pump OFF

Discharge air temperature sensor setting on the Air Handler Control will remain at set point on W1 demand and be increased 15ºF for W2 demand.

Heat Pump ON

Discharge air temperature sensor setting on Air Handler Control will remain at set point. W1 demand will increase set point 15ºF. W2 demand will increase set point an additional 15ºF. (Total of 30ºF)

Below

Activate Y2

Delay Timer

Finished or last

change was

down-

stage

Yes

Y1 ON and

Y2 OFF

More Electric

Heat

available

Yes

Adjust Target

Discharge Air

Temperature

Turn OFF Electric

Heat Section

Figure 24. EVENHEAT Operation (2 of 2)

CBX32MV

Discharge air

temperature is

within target range?

Measured discharge air temperature is above or

below

target range?

Page 40

Turn ON one Electric Heat

section

NOTE — Optional Outdoor Thermostat (Wired between R and W3) will lockout electric elements 3, 4 and 5.

Heat Pump Operation (Heating and Cooling)

Air Handler Control Indoor Blower Mode Speed and Profiles settings

1. Set Cooling Mode Blower Speed jumper pin . (Low and high indoor blower CFM settings are identical for

cooling and heat pump)

2. Set Blower Adjust Selection jumper pin.

3. Set Cooling Mode Blower Ramping jumper pin (Cooling calls - All ramping profiles are active) (Heating calls Only ramping profiles 1 and 2 are active. If profiles 3 or 4 are selected, Control will default to profile 1)

A Profile 1 does not provide any ramping profiles.

B Profile 2 provides a 30 second indoor blower ON delay at the start of a heat pump heating demand. (45

4. Simultaneous Heat Pump and electric heat call: Indoor Blower will operate at the highest CFM requested by

Single or Two-Stage Unit

1. Control on-board link must be cut between Y1 and Y2 to allow two stage cooling operation.

2. Control on-board link must be cut between R and O to allow heat pump operation.

RECOMMEND — USE FIGURE 19 AS A REFERENCE FOR SETTING

second indoor blower OFF delay)

the heat pump or the electric heat blower speed selection.

JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C

CUT ON-BOARD LINK R -O.

IMPORTANT — USE CARE WHEN CUTTING LINKS TO

PREVENT DAMAGE TO CONTROL. SEE FIGURE 19,

CBX32MV JUMP AND LINK GUIDE FOR FURTHER

DETAILS.

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

Heating

Air Handler Control receives inputs on Y1 terminal.

Y1 terminal on Control is configured as input and passes signal from room thermostat to outdoor unit.

NOTE — The outdoor unit control directly controls the outdoor unit operation.

Y1 input to the Control will control the indoor blower according to the cooling or heating mode blower speed ramping and adjust selection jumper pins.

Room thermostat calls for

second stage?

Yes

Room thermostat

calls for first

stage?

Cooling

Air Handler Control receives inputs on Y1 and O terminals.

Y1 terminal on Control is configured as input and passes signal from room thermostat to outdoor unit.

NOTE — The outdoor unit control directly controls the outdoor unit operation.)

Y1 input to the Control. Will control the indoor blower

according to the cooling mode blower speed adjust selection jumper pins.

, ramping and

Yes

De-energize Y2 terminal on Control. Indoor blower speed will reset to Y1 demand.

NOTE — The outdoor unit control directly controls the outdoor unit operation.)

Yes

Y2 terminal on Control is configured as input and passes signal from room thermostat to outdoor unit.

NOTE — The outdoor unit control directly controls the outdoor unit operation.)

Still calling for second

Y2 terminal is an input to the Control. The indoor blower will be controlled according to the jumper pin selections.

stage?

Yes

Page 41

Still calling for first

stage?

De-energize Y1 (and O in cooling) terminals on Control.

NOTE — The outdoor unit control directly controls the outdoor unit operation.

De-energize indoor blower per ramping profile.

CBX32MV

Cooling Operation

Air Handler Control Indoor Blower Mode Speed and Profiles settings

1. Set Cooling Mode Blower Speed jumper pin.

2. Set Cooling Mode Blower Ramping jumper pin.

3. Set Blower Adjust Selection jumper pin.

Single or Two-Stage Unit

Control on-board link must be cut between Y1 and Y2 to allow 2 stage cooling operation.

Room thermostat

calls for first

stage?

Air Handler Control receives inputs on Y1 terminal.

Y1 terminal on Control is configured as input and passes signal from room thermostat to outdoor unit.

NOTE - The outdoor unit control directly controls the outdoor unit operation.

CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C

RECOMMEND — USE FIGURE 19 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

IMPORTANT - Use care when cutting links to prevent damage to control. See Figure 19, CBX32MV jump and link guide for further details.

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

Y1 input to the Control will control the indoor blower according to the cooling or heating mode blower speed, ramping and adjust selection jumper pins.

Room thermostat calls for

second stage?

YesYes

Y2 terminal on Control is configured as input and passes signal from room thermostat to outdoor unit.

NOTE - The outdoor unit control directly controls the outdoor unit operation.

Still calling for second

stage?

Y2 terminal is an input to the Control. The indoor blower will be controlled according to the jumper pin selections.

Yes

De-energize Y2 terminal on Control. Indoor blower speed will reset to Y1 demand.

NOTE - The outdoor unit control directly controls the outdoor unit operation.

Still calling for first

stage?

De-energize Y1 (and O in cooling) terminals on Control.

NOTE - The outdoor unit control directly controls the outdoor unit operation.

De-energize indoor blower per ramping

profile.

Yes

CBX32MV

Page 42

Error Code / Recall Mode

Yes No

To enter Error Code Mode, push and hold button next to single character LED display until solid E symbol appears, release button.

Control will display up to ten error codes stored in memory. If E 0 0 0 is displayed, there are no stored error codes.

E 0 0 0

To exit Error Code Recall Model, push and hold button next to single character LED display until solid three horizontal bars appears, then release button.

NOTE — Error Codes are not cleared from memory.



Control in Idle Mode

(No heating cooling or indoor

fan operation)

To clear error codes stored in memory, continue to hold push button while the solid three horizontal bars are displayed. Release button when solid is displayed.

Turn room thermostat to OFF

Solid c starts blinking on

single character LED

display.



The display will blink for up to ten seconds. During this time, press the button and release to confirm deletion of the error code history. As confirmation, Control will display 0 0 0 0 . (If ten second period expires or push button is not released, control will automatically exit Error Code Mode and go into mode without deleting error code history.

0 0 0 0

NOTE — Once the error code history is deleted, it cannot be recovered.

Page 43

CBX32MV

Indoor Blower Test

To enter blower test mode, push and hold button next to single character LED display until — (Solid bar), then release button.

(Solid bar) starts blinking

Indoor Blower Test Mode

Control in Idle Mode

Yes

(No heating cooling or indoor

fan operation)

Turn room thermostat to

Push and hold button until the

solid A symbol is displayed on the single character LED display, then release button.

OFF

Control will cycle the indoor blower motor for ten seconds at 70% of maximum air for selected capacity size unit. Control will automatically exit Indoor Blower Test Mode.

Checkout Procedures

NOTE - Refer to outdoor unit installation instructions for system start-up instructions and refrigerant charging instructions.

PRE‐START‐UP CHECKS

 Is the air handler properly and securely installed?  If horizontally configured, is the unit sloped up to 1/4

inch toward drain lines?

 Will the unit be accessible for servicing?  Has an auxiliary pan been provided under the unit with

separate drain for units installed above a finished ceiling or in any installation where condensate overflow could cause damage?

 Have ALL unused drain pan ports been properly

plugged?

 Has the condensate line been properly sized, run,

trapped, pitched, and tested?

 Is the duct system correctly sized, run, sealed, and

insulated?

 Have all cabinet openings and wiring been sealed?

 Is the indoor coil factory‐installed TXV properly sized

for the outdoor unit being used?

 Have all unused parts and packaging been disposed

of?

 Is the filter clean, in place, and of adequate size?  Is the wiring neat, correct, and in accordance with the

wiring diagram?

 Is the unit properly grounded and protected (fused)?  Is the thermostat correctly wired and in a good

location?

 Are all access panels in place and secure?

CHECK BLOWER OPERATION

 Set thermostat to FAN ON.  The indoor blower should come on.

CHECK COOLING OPERATION

 Set thermostat to force a call for cooling (approximately

5ºF lower than the indoor ambient temperature).

 The outdoor unit should come on immediately and the

indoor blower should start between 30 - 60 seconds later.

 Check the airflow from a register to confirm that the

system is moving cooled air.

CBX32MV

Page 44

 Set the thermostat 5ºF higher than the indoor

temperature. The indoor blower and outdoor unit should cycle off.

CHECK ELECTRIC HEATER (IF USED)

 Set thermostat to call for auxiliary heat (approximately

5°F above ambient temperature). The indoor blower and auxiliary heat should come on together. Allow a minimum of 3 minutes for all sequencers to cycle on.

 Set the thermostat so that it does not call for heat. Allow

up to 5 minutes for all sequencers to cycle off.

Operation

COOLING (COOLING ONLY OR HEAT PUMP)

When the thermostat calls for cooling, 24 volts is put on the blower time-delay relay coil. After a delay, the indoor blower relay energizes. The normally open contacts close, causing the indoor blower motor to operate. The circuit between R and Y is completed, closing the circuit to the contactor in the outdoor unit, starting the compressor and outdoor fan motor.

On heat pumps, circuit R and O energizes the reversing valve, switching the valve to the cooling position. (The reversing valve remains energized as long as the thermostat selector switch is in the COOL position.)

At the completion of the cooling demand and after the relay's time‐delay, the compressor and outdoor fan will cycle off.

HEATING (ELECTRIC HEAT ONLY)

When the thermostat calls for heat, the circuit between R and W is completed, and the heat sequencer is energized. A time delay follows before the heating elements and the indoor blower motor come on. Units with a second heat sequencer can be connected with the first sequencer to W on the thermostat subbase, or they may also be connected to a second stage on the subbase.

HEATING (HEAT PUMP)

When the thermostat calls for heating, 24 volts is put on the blower time-delay relay coil. After a delay, the normally open contacts close, causing the indoor blower motor to operate. The circuit between R and Y is completed, closing the circuit to the contactor in the outdoor unit, starting the compressor and outdoor fan motor. Circuit R and G energizes the blower relay, starting the indoor blower motor.

If the room temperature should continue to fall, the circuit between R and W1 is completed by the second‐stage heat room thermostat. Circuit R-W1 energizes a heat sequencer. The completed circuit will energize supplemental electric heat (if applicable). Units with a second heat sequencer can be connected with the first sequencer to W1 on the thermostat. They may also be connected to a second heating stage W2 on the thermostat subbase.

EMERGENCY HEAT (HEATING HEAT PUMP)

If the selector switch on the thermostat is set to the emergency heat position, the heat pump will be locked out of the heating circuit, and all heating will be electric heat (if applicable). A jumper should be placed between W2 and E

on the thermostat subbase so that the electric heat control will transfer to the first‐stage heat on the thermostat. This will allow the indoor blower to cycle on and off with the electric heat when the fan switch is in the AUTO position.

Maintenance

DEALER

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.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.

Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.

Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows:

Outdoor Unit

1. Outdoor unit fan motor is pre-lubricated and sealed. No further lubrication is needed.

2. Visually inspect all connecting lines, joints and coils for evidence of oil leaks.

3. Check all wiring for loose connections.

4. Check for correct voltage at unit (unit operating).

5. Check amp draw on outdoor fan motor. Motor Nameplate:_________ Actual:__________.

6. Inspect drain holes in coil compartment base and clean if necessary.

NOTE ‐ If insufficient cooling occurs, the unit should be gauged and refrigerant charge should be checked.

Outdoor Coil

Clean and inspect outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning.

NOTE - It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cottonwood seeds, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts)

Sea Coast — Moist air in ocean locations can carry salt, which is corrosive to most metal. Units that are located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit including the outdoor coil. Consult your installing contractor for proper intervals/procedures for your geographic area or service contract.

Indoor Unit

1. Clean or change filters.

2. Lennox blower motors are prelubricated and permanently sealed. No more lubrication is needed.

Page 45

CBX32MV

3. Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure.

4. Belt Drive Blowers - Check belt for wear and proper tension.

5. Check all wiring for loose connections.

6. Check for correct voltage at unit. (blower operating)

7. Check amp draw on blower motor.

Motor Nameplate:_________ Actual:__________.

Indoor Coil

8. Clean coil if necessary.

9. Check connecting lines, joints and coil for evidence of oil leaks.

10. Check condensate line and clean if necessary.

Cabinet Insulation

IMPORTANT

DAMAGED INSULATION MUST BE REPAIRED OR RE PLACED before the unit is put back into operation. Insula tion loses its insulating value when wet, damaged, sepa rated or torn.

Matt‐ or foil-faced insulation is installed in indoor equipment to provide a barrier between outside air conditions (surrounding ambient temperature and humidity) and the varying conditions inside the unit. If the insulation barrier is damaged (wet, ripped, torn or separated from the cabinet walls), the surrounding ambient air will affect the inside surface temperature of the cabinet. The

temperature/humidity difference between the inside and outside of the cabinet can cause condensation on the inside or outside of the cabinet which leads to sheet metal corrosion and subsequently, component failure.

REPAIRING DAMAGED INSULATION

Areas of condensation on the cabinet surface are an indication that the insulation is in need of repair.

If the insulation in need of repair is otherwise in good condition, the insulation should be cut in an X pattern, peeled open, glued with an appropriate all-purpose glue and placed back against the cabinet surface, being careful to not overly compress the insulation so the insulation can retain its original thickness. If such repair is not possible, replace the insulation. If using foil‐faced insulation, any cut, tear, or separations in the insulation surface must be taped with a similar foil-faced tape.

GLUE -make sure there is full coverage of glue on the metal or insulation so there are no areas where air pockets may form which can lead to sweating.

1. CUT INSULATION IN X PATTERN

2. APPLY GLUE

3. PRESS GLUED TABS AGAINST CABINET

Figure 25. Repairing Insulation

CBX32MV

Page 46

Sequence of Operations

A CBX32MV - 208/230V SINGLE PHASE

1. Line voltage is routed to transformer T1 and blower motor B3.

2. T1 supplies 24VAC to terminal strip TB2, which supplies 24VAC to the indoor thermostat and electric heat, if used.

HEATING

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay contained in the ECB40 heat section. (See electric heat diagrams for operation).

2. Control energizes blower motor B3 on heating speed.

COOLING

1. See Table 13 for cooling sequence of operation.

Page 47

CBX32MV

Table 13. Cooling Operation and Jumper Summary

CBX32MV COOLING OPERATION AND JUMPER SUMMARY (OPTIONAL ACCESSORIES) WITHOUT

UNIT JUMPERS

Single Speed Condensing Unit

Two Speed Condensing Unit

Single Speed Heat Pump

Two Speed Heat Pump DS to R

CBX32MV COOLING OPERATION AND JUMPER SUMMARY (OPTIONAL ACCESSORIES)

UNIT JUMPERS THERMOSTAT DEMAND and BLOWER SPEED

Single Speed Condensing Unit

Two Speed Condensing Unit O to R See table 15

Single Speed Heat Pump Y1 to Y2 See table 14

Two Speed Heat Pump NONE See table 15

CBX32MV COOLING OPERATION AND JUMPER SUMMARY (OPTIONAL ACCESSORIES)

UNIT JUMPERS SEQUENCE OF OPERATION

Single or Two Speed Condensing Unit O to R

Single or Two Speed Heat Pump NONE

ComfortSense® 7000t WITHOUT HARMONY IIIt

THERMOSTAT

DEMAND

DS to R

Y1 to Y2

O to R

DS to R

O to R

DS to Y1 Y1 to Y2

WITH ComfortSense 7000 WITHOUT HARMONY III

Y1 to Y2

O to R

WITHOUT ComfortSense 7000 WITH HARMONY III

Harmony controls blower speed according to size of demand, through pulse width modulated signal to DS

Y1 COOL

Y1 70% of COOL

Y2 COOL

Y1 COOL

Y1 70% of COOL

Y2 COOL

See table 14

BLOWER SPEED

NOTE - Continuous fan CFM will be 50% of COOL speed. Blower will run on HEAT speed during Heat operation.

CBX32MV

Page 48

This section details unit operating sequence for non-communicating systems. NOTE - For communicating systems, see the iComfort thermostat installation instruction.

Table 14. CBX32MV with ComfortSenset 7000 Thermostat and Single-Stage Outdoor Unit Operating Sequence

Operating Sequence System Demand System Response

System

Condition

Normal Operation 1 On On On Acceptable 24 VAC High 100%

Dehumidification Call

Normal Operation 1 On On On Acceptable 24 VAC High 100%

Dehumidification call

Dehumidification call ONLY

Step

2 On On On Demand 0 VAC High 70%

1 On On On Demand 0 VAC High 70%

Thermostat Demand Relative Humidity

Comp

Y1 Y2 O G W1 W2 Status D

NO CALL FOR DEHUMIDIFICATION

BASIC MODE (Only active on a Y1 thermostat demand)

PRECISION MODE (Operates independent of a Y1 thermostat demand)

Air

Handler

CFM

(COOL)

Comments

Compressor and indoor air handler follow thermostat demand

ComfortSense 7000 thermostat energizes Y1 and de-energizes D on a call for dehumidification.

NOTE - No over cooling.

Dehumidification mode begins when humidity is greater than set point

ComfortSense 7000 will keep outdoor unit energized after cooling temperature setpoint has been reach in order to maintain room humidity setpoint.

NOTE - Allow to over

cool 2

F from cooling set

point.

Table 15. CBX32MV with ComfortSenset 7000 Thermostat and Two‐Stage Outdoor Unit Operating Sequence

Operating Sequence System Demand System Response

Thermostat Demand Relative Humidity

System Condition

Step

Y1 Y2 O G W1 W2 Status D

Compre

ssor

No Call for Dehumidification

Normal Operation

- Y1

Normal Operation

- Y2

1 On On On Acceptable 24 VAC Low 70%

2 On On On On Acceptable 24 VAC High 100%

Room Thermostat Calls for First-Stage Cooling

BASIC MODE (Only active on a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable 24 VAC Low 70%

Dehumidification Call

2 On On On On Demand 0 VAC High 70%

PRECISION MODE (Operates independent of a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable 24 VAC Low 70%

Dehumidification call

Dehumidification call ONLY

2 On On On On Demand 0 VAC High 70%

1 On On On On Demand 0 VAC High 70%

Air

Handler

CFM

(COOL)

Comments

Compressor and indoor air handler follow thermostat demand

ComfortSense 7000 ther mostat energizes Y2 and deenergizes D on a call for dehumidification

NOTE - No over cooling.

Dehumidification mode be gins when humidity is greater than set point

ComfortSense 7000 thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint.

NOTE — Allow to over cool

F from cooling set point.

Page 49

CBX32MV

Table 14. CBX32MV with ComfortSenset 7000 Thermostat and Two‐Stage Outdoor Unit Operating Sequence

(continued)

Operating Sequence System Demand System Response

Thermostat Demand Relative Humidity

System Condition

Step

Y1 Y2 O G W1 W2 Status D

Compre

ssor

Room Thermostat Calls for First- and Second-Stage Cooling

BASIC MODE (Only active on a Y1 thermostat demand)

Normal Operation 1 On On On On Acceptable 24 VAC High 100%

Dehumidification Call

2 On On On On Demand 0 VAC High 70%

PRECISION MODE (Operates independent of a Y1 thermostat demand)

Normal Operation 1 On On On On Acceptable 24 VAC High 100%

Dehumidification call

Dehumidification call ONLY

2 On On On On Demand 0 VAC High 70%

1 On On On On Demand 0 VAC High 70%

Air

Handler

CFM

(COOL)

Comments

ComfortSense 7000 ther mostat energizes Y2 and deenergizes D on a call for dehumidification

NOTE — No over cooling.

Dehumidification mode be gins when humidity is greater than set point

ComfortSense 7000 thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint.

NOTE — Allow to over cool

F from cooling set point.

CBX32MV

Page 50

A ECB40-2.5, 4, 5 and ECB40-4CB, 5CB 208/230V Single Phase

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized.

Page 51

CBX32MV

B ECB40-6 and ECB40-6CB 208/230V Single Phase

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized.

CBX32MV

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C ECB40‐8 and ECB40-8CB - 208/230V Single Phase

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized.

SECOND-STAGE HEAT (remove jumper between W2 and R)

1. When K32‐1 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to the Control. The Control outputs a 22VDC signal to the K33 relay.

2. When K33‐1 closes, assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE2 is energized.

Page 53

CBX32MV

D ECB40‐9CB - 208/230V Single Phase

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized.

SECOND-STAGE HEAT (remove jumper between W2 and R)

1. When K32‐1 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to the Control. The Control outputs a 22VDC signal to the K33 relay.

2. When K33‐1 closes, assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE2 is energized.

CBX32MV

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E ECB40-12.5CB, ‐15CB - 208/230V Single Phase

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized.

SECOND-STAGE HEAT(remove jumper between W2 and R)

1. When K32‐1 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to the Control. The Control outputs a 22VDC signal to the K33 and K34 relays.

2. When K33‐1 and K34-1 close, assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE2 and HE3 are energized.

Page 55

CBX32MV

F ECB40‐20CB - 208/230V Single Phase

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 and K33 relays. K32-1 and K33-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE1 and HE3 are energized.

SECOND-STAGE HEAT (remove jumper between W2 and R)

1. When K32‐1 and K33-1 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to the Control. The Control outputs a 22VDC signal to the K34 and K35 relays.

2. When K34‐1 and K35-1 closes, assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE2 and HE4 are energized.

CBX32MV

Page 56

G ECB40‐25CB - 208/230V Single Phase

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 and K34 relays. K32-1 and K34-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE1 and HE2 are energized.

SECOND-STAGE HEAT (remove jumper between W2 and R)

1. When K34 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to the Control. The Control outputs a 22VDC signal to the K33 and K35 relays. When K33- 1 and K35-1 clos es and assumi ng the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE3 and HE4 are energized.

THIRD- STAGE HEAT (remove jumper between W3 and R, if using third stage)

1. When K35 closes, the unit is ready for a third stage heat demand. W3 of the thermostat, if available, provides a W3 demand to the Control. The Control outputs a 22VDC signal to the K36 relay. When K36-1 and K36-2 closes and a s s u m ing the N. C . primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE5 and HE6 are energized.

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CBX32MV

H ECB40-8, 10 and ECB40‐15CB - 208/230V Three Phase

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 relay. K32-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat element HE1 is energized.

SECOND-STAGE HEAT (remove jumper between W2 and R)

1. When K32‐1 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to the Control. The Control outputs a 22VDC signal to the K33 and K34 relays.

2. When K33‐1 and K34-1 close, assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE2 and HE3 are energized.

CBX32MV

Page 58

I ECB40‐20CB, ECB25CB - 208/230V Three Phase

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the Control. The Control outputs a 22VDC signal to the K32 and K34 relays. K32-1 and K34-1 closes.

2. Assuming the N.C. primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE1 and HE2 are energized.

SECOND-STAGE HEAT (remove jumper between W2 and R)

Page 59

CBX32MV

Unit Components

ELECTRIC HEAT RELAY

PART NO. 49W91

19 IN.

(483 MM)

5-1/2 IN.

(140 MM)

SENSOR

(CENTER SIDE-T0 -SIDE)

DETAIL A

THE AIR HANDLER CONTROL HAS TWO SCREW TERMINALS MARKED DISCHARGE AIR SENSOR. THE SENSOR IS REQUIRED FOR EVENHEAT OPERATION, IS FIELD-INSTALLED AND MUST BE ORDERED SEPARATELY (CATALOG # 88K38).

DISCHARGE SENSOR

TEMPERATURE RESISTANCE

(DAT)

CHART

TEMP RESISTANCE ºF (OHMS) 30 34,566 40 26,106 50 19,904 60 15,313 70 11,884 80 9,298 90 7,332 100 5,826

22V DIRECT CURRENT COIL

30 AMP CONTACT

RATING

DETAIL B

CONNECTOR

9-PIN CONNECTOR

9-PIN

FASTEN THE PROBE

BRACKET TO THE

PLENUM WITH TWO

SELF-TAPPING SHEET

METAL SCREWS.

AIR HANDLER CONTROL

SECURING SCREWS

AIR HANDLER CONTROL L-BRACKET MOUNTING PLATE

CBX32MV AIR HANDLER CONTROL

PART NO. 50W28

PLENUM

NOTE — EVENHEAT MODE CANNOT BE ENABLED WITH HARMONY III DISCHARGE AIR SENSOR.

DUE TO EACH CONTROL REQUIRING ITS OWN

CBX32MV

CONNECT WIRES TO DISCHARGE AIR SENSOR

TERMINAL ON AIR HANDLER CONTROL.

Figure 26. Component Connections

Page 60

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.

Low voltage connections are made on the air handler control (AHC) also located in the control box. All AHC will have factory installed clippable links connecting DS to R, R to O and Y1 to Y2. These links will have to be removed in certain unit application. See table 16.

Table 16. Links

Application

Remove Links

Harmony III DS to R

Heat Pump R to O

Two-Stage Cooling Y1 to Y2

A-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. Transformers are rated at 70VA. 208/240VAC single‐phase transformers use two primary voltage taps.

D-AIR HANDLER CONTROL (AHC)

The Air Handler Control manages electric heat, indoor blower and accessory controls. The Air Handler Control also provides system configuration and air-flow adjustments plus diagnostic capabilities.

F-DISCHARGE SENSOR (DAT)

The Air Handler Control has two screw terminals marked Discharge Air Sensor. The sensor is REQUIRED for EvenHeater

operation and is field mounted and ordered

separately, use Lennox Catalog # 88K38.

In the EvenHeater mode, the discharge air sensor cycles the electric heating elements as needed to maintain the Air Handler control EvenHeater jumper selected discharge setpoint.

Wiring distance between the Air Handler Control and the discharge air sensor should not exceed 10' (3m) when wired with 18-gauge thermostat wire.

G-OUTDOOR AIR SENSOR

These terminals are for FUTURE USE. (DO NOT USE).

J-VARIABLE SPEED BLOWER MOTOR (ECM) (B3)

208 / 240 VOLT TRANSFORMER

PRIMARY

ORANGE

240 VOLTS

RED

208 VOLTS

BLACK

Figure 27 Transformer

B-PLASTIC DRAIN PANS

Both up-flow/down-flow 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. Each pan has a set of connections, one for a primary drain and one for an auxiliary drain.

SECONDARY

BLUE

YELLOW

Blower Motor (B3)

To Remove Blower From Unit: Remove wiring jack plug and

three screws and slide blower out.

Figure 28. Blower Motor (B3)

WARNING

During blower operation, the ECM motor emits ener gy that may interfere with pacemaker operation. In terference is reduced by both the sheet metal cabinet and distance.

C-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 inlet screen feeds multiple parallel circuits through the coils. The coil is designed to easily slide out of the unit cabinet.

The ECM (electronically commutated motor) communicates with the air handler control via a 2-way serial connection. The motor receives all necessary functional parameters from the air handler control and does not rely on a factory program like traditional variable speed motors. The wiring harness connects the motor to the air handler control. See wiring diagram regarding wiring harness. A soli d‐state contro ller is permanently attached to the motor. The controller is

Page 61

CBX32MV

primarily an AC to DC converter. Converted DC power is used to drive the motor. The controller contains a microprocessor which monitors varying conditions inside the motor (such as motor workload). Because this motor has a permanent magnet rotor it does not need brushes like conventional DC motors. Internal components are shown in figure 29. The stator windings are split into three poles which are electrically connected to the controller. This arrangement a l l o w s motor windings to turn on and off in sequence by the controller.

IMPORTANT

Earlier ECM motors used on other Lennox air handler models are not interchangeable with motors used on the CBX32MV line.

STATOR

CONTROLLER

(WINDINGS)

BEARING

OUTPUT

SHAFT

Motor Start‐Up

When B3 begins start‐up, the motor gently vibrates back and forth for a moment. This is normal. During this time the electronic controller is determining the exact position of the rotor. Once the motor begins turning, the controller slowly eases the motor up to speed (this is called “soft‐start”). The motor may take as long as 60 seconds to reach full speed. If the motor does not reach 200RPM within 13 seconds, the motor shuts down. Then the motor will immediately attempt a restart. The shutdown feature provides protection in case of a frozen bearing or blocked blower wheel. The motor may attempt to start eight times. If the motor does not start after the eighth try, the controller locks out. Reset controller by momentarily turning off power to unit.

The DC filter capacitors inside the controller are connected electrically to the motor supply wires. The capacitors take approximately 5 minutes to discharge when the disconnect is opened. For this reason it is necessary to wait at least 5 minutes after turning off power to the unit before attempting to service motor.

DANGER

ROTOR

Figure 29. Blower Motor Components

The controller uses sensing devices to sense what position the rotor is in at any given time. By sensing the position of the rotor and then switching the motor windings on and off in sequence, the rotor shaft turns the blower.

All CBX32MV blower motors use single phase power. An external run capacitor is not used. The motor uses permanently lubricated ball‐type bearings.

Internal Operation

The motor is controlled via serial communication between the integrated control and the controller permanently attached to the motor shell. The messages sent back and forth between the two controls serve to communicate rotational direction, demand, motor size, current draw, torque, and RPM, among other variables.

Motor RPM is continually adjusted internally to maintain constant static pressure against the blower wheel. The controller monitors the static work load on the motor and motor amp‐draw to determine the amount of RPM adjustment. Blower RPM may be adjusted any amount in order to maintain a constant cfm as shown in Blower Ratings Tables. The cfm remains relatively stable over a broad range of static pressure. Since the blower constantly adjusts RPM to maintain a specified cfm, motor RPM is not rated. Hence, the terms “cool speed”, “heat speed ” or “speed tap” in this manual, on the unit wiring diagram and on blower B3, refer to blower cfm regardless of motor RPM.

Initial Power Up

When line voltage is applied to B3, there will be a large inrush of power lasting less than 1/4 second. This inrush charges a bank of DC filter capacitors inside the controller. If the disconnect switch is bounced when the disconnect is closed, the disconnect contacts may become welded. Try not to bounce the disconnect switch when applying power to the unit.

Disconnect power from unit and wait at least five minutes to allow capaci tors to discharge before attempting to service motor. Failure to wait may cause personal injury or death.

INDOOR BLOWER MOTOR (B3) CONTROL TROUBLESHOOTING (REGAL-BELOIT)

NOTE - If the communication channel is disrupted (loss of communication and of 24VAC) to the air handler control, the motor will continue to operate at its current mode. This means, if the motor is currently in idle, it will stay in idle mode; if it is currently running, it will stay running at the current operating point.

To verify motor operation see steps below and figure 30.

CHECK POWER TO MOTOR

1. Remove J48 (5-pin power plug) from P48 on the motor.

2. With the power on at the air handler, use a test meter to verify 240V between pins 4 and 5 on J48.

3. Reconnect J48 to P48 on the motor.

APPLY TEST SIGNAL FOR MOTOR OPERATION

1. Remove J49 (4-pin low voltage connector) from P49 on the motor.

2. Using test jumpers, apply 24V to pins 3 and 4 on P49 on the motor.

Note: Do not apply 24V to pins 2 and 4 on P49. Doing so will cause permanent damage to the motor.

3. Motor should run at 75%.

4. Test is complete. Remove jumpers and reconnect plugs.

Another option is to use the TECMate PRO with the 16 to 4 pin adaptor. The use of the TECMate PRO isolates the motor from the integrated control. Follow the instructions provided with the kit. If the motor runs do not replace.

CBX32MV

Page 62

J48 5 Pin

P48 5 PIN

MOTOR with INTEGRATED

CONTROLLER

P49 4 PIN

P48 5 PIN

P49 4 PIN

J49 4 Pin

J48 5 Pin Line Voltage Connector

J49 4 Pin Control Connector

Figure 30. Regal-Beloit — Blower B3 Harness

Connectors

P48 5 Pin

P49 4 Pin

J48 Connector installed on motor

120v

J48 Connector

230v

Page 63

P49 4 Pin

24v Transformer

J49 Connector

Figure 31. Regal-Beloit / Gemtech 3.0 —

Troubleshooting

CBX32MV

INDOOR BLOWER MOTOR (B3) CONTROL TROUBLESHOOTING (EMERSON)

1. Disconnect three-wire harness from motor control module.

A If the plug terminals inside the module are

damaged.

B If terminals are not damaged, proceed to next step.

2. Inspect the negative temperature coefficient (NTC) thermistor (see figure 33) for any cracks or breakage.

A If damaged, replace control.

B If no damage is detected, proceed to next step.

3. Check the capacitors for any damage. Inspect for:

A Bulging or swelling caps. If caps are bulging or

swollen, replace control.

B If no damage is detected, proceed to next step.

4. Check resistance between each of the three pins on the control module jack (see figure 33). Resistance between any two terminals should be greater than 100 K ohms.

A If resistance is less than 100 K ohms, replace

control.

B If no damage is detected, proceed to next step.

NOTE - If your ohm meter is not an auto-ranging type, please set it to the highest ohm scale (100 K ohms or greater).

Scale

2 M

200 K

20 K

2 K

200 two hundred ohms 0 - 200

Measurement range in words

two megohm-two million ohms

two hundred kilo-ohm-two hundred thousand ohms

twenty kilo-ohm-twenty thousand ohms

two kilo-ohm two-thousand ohms

ohms

0 - 2,000,000

0 - 200,000

0 - 20,000

0 - 2,000

CONTROL MODULE

3-PIN JACK

THERMISTOR

NTC

Figure 33. Module Test (Emerson(

Additional Indoor Blower Motor (B3) Troubleshooting

1. If motor shaft spins freely in both directions, proceed to next step. If not, replace motor.

2. Check the motor to control harness for any damage. A If harness or terminals are damaged replace the

motor.

B If there is no damage, proceed to next step.

3. Check resistance between each of the three-phase terminals in the motor harness as illustrated in figure

34. Resistance between any two contacts should be equal. If resistance between any two contacts are not equal, or if any resistance shows open or short-circuited, replace the motor.

MOTOR 3-PIN

PLUG

Figure 32. Typical Digital Multimeter

CBX32MV

Figure 34. Motor Test (Emerson)

Page 64

P48 (5-PIN)

P49 (4-PIN)

P48 5 Pin

P49 4 Pin

P48 (5-PIN)

HARNESS

MOTOR

J48 5 Pin Line Voltage Connector

J49 4 Pin Control Connector

CONTROL MODULE

Figure 35. Indoor Blower Motor (B3) Control Connections (Emerson)

P49 (4-PIN) HARNESS

P48 (5-PIN) HARNESS

MOTOR

CONTROL MODULE

120v

Figure 36. J48 Test (Emerson)

230v

P49 4 Pin

J48 Connector

Page 65

CBX32MV

P48 (5-PIN)

HARNESS

P49 (4-PIN) HARNESS

P48 (5-PIN) HARNESS

MOTOR

CONTROL MODULE

Figure 37. J49 Test (Emerson)

Optional Electric Heat (ECB40)

A-MATCHUPS AND RATINGS

The tables on the following pages show all approved CBX32MV to ECB40 matchups and electrical ratings.

B-ELECTRIC HEAT COMPONENTS

ECB40 parts arrangement is shown in figure 38. All electric heat sections consist of components mounted to the electric heat vestibule panel and electric heating elements exposed directly to the air stream. ECB units are equipped with circuit breakers or a terminal blocks. The circuit breakers are designated by CB in the model number.

1. Primary (S15) and Secondary (S20) Temperature

Limits

Each stage of the electric heat is protected by a primary (S15) and secondary (S20) high temperature limit. Both S15 and S20 are located in the same housing. Each stage uses the same style of limits. Both the primary and secondary limits are wired in series with a heat element. When either S15 or S20 opens, the corresponding heat element is de‐energized. All other heating elements remain energized. The primary high temperature limit opens on a temperature rise and closes on a temperature fall. The secondary limit opens on a temperature rise but must be replaced. See table 17 for set points.

TABLE 17

Limit

S15 150F + 5 110 + 9

S20 333F + 10F Replace limit

2. Electric Heat Relays (K32, K33, K34, K35 and K36)

Relays K32, K33, K34, K35 and K36 are N.O. relays located on the electric heat vestibule panel and are energized by a 24V heating demand (W1, W2, and W3) via jack/plug 2 (J2), which is used to connect electric heat to the blower coil control circuit. The r e l a y s energ i z e different stages of heat, as well as the blower. The blower is always first on and last off.

Open° Close°

J49 4 Pin

J49 Connector

24v Transformer

3. Terminal Strip (TB2)

For the electric heat sections without circuit breakers or fuses, line voltage connections are made to terminal strip TB2. The terminal strip is located in the lower left corner of the electric heat vestibule panel. Single‐phase electric heat uses two pole terminal strips; while three‐phase electric heat uses three pole terminal strips.

4. Circuit Breaker (CB1, CB2 and CB3)

Line voltage connections are made to circuit breakers CB1,CB2 and CB3 in the electric heat sections with circuit breakers (designated by CB in the model numbers). Tables in the following pages show the amp rating for each circuit breaker used. Single‐phase electric heat uses two pole circuit breakers; while three‐phase electric heat uses three pole circuit breakers.

NOTE - Electric Heat Circuit Breakers are sized for 240VAC operation. Electric heaters operating at voltages other than 240VAC may require the factory installed circuit breaker be replaced with a field installed circuit breaker. See Maximum Overcurrent Protection column in the Electric Heat Tables to determine if a circuit breaker change is required.

NOTE - Do not remove patch plate or insulation on units without circuit breakers!!

5. Heating Elements (HE1 through HE6)

Heating elements are composed of helix wound bare nichrome wire exposed directly to the air stream. The elements are supported by insulators mounted to th e wire frame. For single phase applications, one element is used per stage. Each stage is energized independently by the corresponding relay located on the electric heat vestibule arranged in a three phase delta. Once energized, heat transfer is instantaneous. High temperature protection is provided by primary and secondary high temperature limits.

CBX32MV

Page 66

ECB40-9CB P VOLTAGE SHOWN

Elements HE1 and HE2

Location of CB1

Relay K33

Primary Limit S15 and Secondary Limit S20

Relay K32

Figure 38. Electric Heat

Page 67

CBX32MV

Lennox CBX32MV-018/024, CBX32MV-024/030, CBX32MV-060, CBX32MV-068, CBX32MV-036 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual