Lennox CBX40UHV, CBX40UHV-024, CBX40UHV-030 Installation And Service Procedure

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INSTALLATION AND SERVICE

PROCEDURE

Corp. 0906-L2

Service Literature

Revised August, 2018

CBX40UHV (HFC-410A) SERIES UNITS (Communicating)

NOTICE

A thermostat is not included and must be ordered separately.

D A Lennox communicating thermostat must be used in

communicating applications (CBX40UHV-XXX-230-6-02 and later).

D In non-communicating applications, the Lennox

ComfortSense as other non-communicating thermostats.

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

7500 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

Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working near these areas during installation or while servicing this equipment.

CBX40UHV

TABLE OF CONTENTS

Model Number Identification 2.......................

Specifications / Electrical Data 2.....................

Blower Performance 3..............................

Parts Arrangement 3...............................

Application 9......................................

Unit Components 9.................................

Field Wiring 13....................................

Air Handler Control Button, Display and Jumpers 17....

Variable Speed ECM Blower Motor 20................

Optional ECB40 Electric Heat 25.....................

Optional Humidity Control 25........................

Unit Sequence of Operations 33.....................

Unit Status and Alarm Codes 35.....................

Application Configuration Modifications 38.............

Start-Up Operation 41..............................

Operating Characteristics 41........................

Maintenance 42....................................

Configuring Unit Flow Charts 43.....................

Unit Diagram 52...................................

Electric Heat Diagrams and Sequence of

Operations 53.....................................

CBX40UHV series units are designed to be matched with Lennox two‐stage or single‐stage HFC-410A air conditioner units and heat pumps. Several models are available in sizes ranging from 2 through 5 tons. All units are equipped with factory installed HFC-410A check and expansion valve for cooling or heat pump applications.

This air handler is compatible with the ComfortSense® 7500 non-communicating thermostat and non-communicating outdoor units. In addition, this unit has the enhanced capability of communicating with a communicating thermostat and compatible outdoor units using the Lennox RSBus protocols.

Optional ECB40 electric heat is available in several kW sizes, and can be field installed in the cabinets.

This document provides service information on the following model builds:

1. Non-communicating version (CBX40UHV-XXX-

230-6-01)

2. Communicating version (CBX40UHV-XXX-

230-6-02) or later.

Page 1

2018 Lennox Industries Inc.

MODEL NUMBER IDENTIFICATION

CB X 40 UHV − 036 − 230 − 6 − 02

Unit Type

Minor Revision Number

CB = Air Handler

Refrigerant Type

X = R-410A

Series

Configuration

UHV = Up-Flow/Horizontal, Variable

Speed Blower Motor

Nominal Cooling Capacity

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

024 = 2 tons

030 = 2.5 tons

036 = 3 tons

042 = 3.5 tons

048 = 4 tons 060 = 5 tons

SPECIFICATIONS / ELECTRICAL DATA

Refer to the Unit Engineering Handbook or Lennox Price Book for optional accessories for this unit.

SPECIFICATIONS

General Data

Model Number

Nominal cooling capacity - tons

Refrigerant

Connections in.

Indoor Coil

Blower Data Wheel nominal diameter x width - in.

Filters (MERV16) Shipping Data - 1 Package - lbs.

Suction (vapor) line - sweat

Liquid line - sweat

Condensate drain (fpt)

Net face area - ft.

Tube outside diameter - in.

Number of rows

Fins per inch

Motor output - hp

Size - in.

CBX40UH

‐024

2 2.5 3 3.5 4 5

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

3/4 3/4 3/4 7/8 7/8 7/8 3/8 3/8 3/8 3/8 3/8 3/8

(2) 3/4 (2) 3/4 (2) 3/4 (2) 3/4 (2) 3/4 (2) 3/4

5.0 5.0 5.0 7.22 7.22 7.22 3/8 3/8 3/8 3/8 3/8 3/8

3 3 3 3 3 3

12 12 12 12 12 12

11 X 8 11 X 8 11 X 8 11-1/2 X 9 11-1/2 X 9 11-1/2 X 9

1/2 1/2 3/4 1 1 1

20 X 20 X 5 20 X 20 X 5 20 X 20 X 5 20 X 25 X 5 20 X 25 X 5 20 X 25 X 5

165 167 172 214 216 216

CBX40UH

‐030

CBX40UH

‐036

CBX40UH

‐042

ELECTRICAL DATA

Voltage - phase - 60hz

Maximum overcurrent protection (unit only)

Minimum circuit ampacity (unit only)

Disposable frame type filter.

HACR type circuit breaker or fuse.

15 15 15 20 20 20

5 5 10 10 10 10

208/230V-1PH

CBX40UH

‐048

CBX40UH

‐060

Page 2

CBX40UHV

BLOWER DATA

CBX40UHV024 BLOWER PERFORMANCE

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

“AJUST”

Jumper Setting

“HEAT” Speed “COOL” Speed

Jumper Speed Positions

NOTES:

NORM

cfm

715 855 1000 1130 465 690 900 1050

670 770 900 1035 425 620 825 950

580 700 800 930 385 560 735 850

cfm

S The effect of static pressure, filter and electric heater resistance is included in the air volumes listed. S 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.

S Lennox Harmony III™ Zone Control applications - minimum blower speed if 250 cfm.

CBX40UHV‐024 BLOWER MOTOR WATTS AT “+” (Plus) AHC SETTING (Adjust Jumper at “+” Setting)

AHC Jumper Speed

Positions

TAP 1 53 68 89 113 143 163 191 214 232

HEAT SPEED

COOL SPEED

CBX40UHV‐024 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (Adjust Jumper at NORM Setting)

TAP 2 73 93 122 141 170 200 234 260 282

TAP 3 105 141 168 179 217 248 275 306 348

TAP 4 132 159 189 218 248 285 313 349 393

TAP 1 25 35 56 73 89 98 114 130 143

TAP 2 45 64 79 101 130 151 180 211 216

TAP 3 75 103 127 146 177 210 243 266 298

TAP 4 11 4 142 175 200 219 258 280 332 363

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 48 64 79 103 128 156 182 196 207

TAP 2 61 80 98 123 149 175 206 233 254

TAP 3 77 101 128 151 178 214 239 267 300

TAP 4 109 142 171 193 223 245 286 325 359

TAP 1 23 38 52 68 80 91 111 128 135

TAP 2 34 53 76 94 111 142 152 176 203

TAP 3 64 87 11 3 130 158 190 226 247 270

TAP 4 89 120 145 166 198 225 258 289 319

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

CBX40UHV‐024 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (Adjust Jumper at “-” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

CBX40UHV

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

TAP 1 38 56 70 94 11 3 130 154 176 192

TAP 2 53 68 88 110 138 163 195 207 234

TAP 3 62 84 103 125 155 186 213 246 268

TAP 4 89 116 141 165 192 220 250 278 314

TAP 1 22 33 47 61 71 83 98 11 0 123

TAP 2 30 46 63 86 102 11 8 138 162 172

TAP 3 54 71 91 116 138 171 191 221 247

TAP 4 66 86 11 7 138 159 195 227 253 286

Motor Watts @ Various External Static Pressures - in. wg.

Page 3

CBX40UHV030 BLOWER PERFORMANCE

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

“AJUST”

Jumper Setting

“HEAT” Speed “COOL” Speed

Jumper Speed Positions

NOTES:

NORM

cfm

800 935 1070 1210 660 880 1100 1320

725 850 975 1100 600 800 1000 1200

655 765 880 990 540 720 900 1080

cfm

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

S Lennox Harmony III™ Zone Control applications - minimum blower speed if 250 cfm.

CBX40UHV‐030 BLOWER MOTOR WATTS AT “+” (Plus) AHC SETTING (Adjust Jumper at “+” Setting)

AHC Jumper Speed

Positions

TAP 1 66 87 11 4 134 162 185 214 239 268

HEAT SPEED

COOL SPEED

CBX40UHV‐030 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (Adjust Jumper at NORM Setting)

TAP 2 101 124 151 175 192 224 243 273 325

TAP 3 134 171 188 212 243 273 296 329 366

TAP 4 182 211 245 285 319 353 375 405 444

TAP 1 47 63 82 101 121 151 175 193 206

TAP 2 83 107 131 152 178 202 231 265 296

TAP 3 142 170 196 220 251 282 315 345 367

TAP 4 209 258 295 345 373 418 452 482 512

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 57 77 94 115 146 172 195 219 232

TAP 2 79 104 123 149 168 196 231 264 294

TAP 3 111 139 164 186 209 233 261 298 334

TAP 4 148 178 199 231 260 293 314 355 382

TAP 1 38 53 68 94 11 3 127 149 169 185

TAP 2 67 84 105 131 152 178 207 240 257

TAP 3 110 141 164 188 213 240 266 292 330

TAP 4 168 197 226 260 302 338 366 400 434

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

CBX40UHV‐030 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (Adjust Jumper at “-” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 48 66 83 107 127 149 171 199 217

TAP 2 63 80 103 125 145 178 200 229 246

TAP 3 86 113 135 155 179 203 244 270 305

TAP 4 109 144 165 191 212 240 264 296 338

TAP 1 32 47 60 86 101 11 3 134 151 168

TAP 2 54 70 88 107 132 157 188 210 225

TAP 3 87 114 137 159 183 206 232 267 302

TAP 4 130 165 184 207 245 270 300 326 363

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

Page 4

CBX40UHV

CBX40UHV036 BLOWER PERFORMANCE

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

“AJUST”

Jumper Setting

“HEAT” Speed “COOL” Speed

Jumper Speed Positions

NOTES:

NORM

1230 1335 1445 1545 900 1225 1380 1545

1120 1215 1315 1400 810 1125 1275 1400

1010 1185 1200 1265 730 1000 1135 1265

cf m

cfm

cf m

cfm

selectable) of the same secondstage COOL speed selected, minimum 380 cfm.

S Lennox Harmony III™ Zone Control applications - minimum blower speed if 380 cfm.

CBX40UHV‐036 BLOWER MOTOR WATTS AT “+” (Plus) AHC SETTING (Adjust Jumper at “+” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

CBX40UHV‐036 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (“Adjust” Jumper at NORM Setting)

TAP 1 189 223 253 271 306 323 359 377 409

TAP 2 238 273 295 316 349 375 417 439 473

TAP 3 279 322 348 384 420 463 486 525 550

TAP 4 327 387 427 451 489 537 566 600 643

TAP 1 130 157 184 212 237 263 284 307 346

TAP 2 183 211 232 261 296 314 342 368 396

TAP 3 248 284 315 349 366 407 441 473 509

TAP 4 347 376 418 464 495 531 566 608 632

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 146 173 199 225 257 279 304 330 364

TAP 2 186 234 241 264 296 319 340 371 395

TAP 3 226 263 281 304 341 371 393 435 456

TAP 4 261 296 321 355 389 423 450 489 519

TAP 1 98 117 143 165 185 216 247 267 301

TAP 2 144 168 197 223 250 272 299 332 356

TAP 3 198 227 265 279 307 340 363 397 431

TAP 4 255 285 313 346 386 418 454 483 527

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

CBX40UHV‐036 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (“Adjust” Jumper at “-” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

CBX40UHV

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

TAP 1 11 0 139 161 185 213 234 263 291 312

TAP 2 182 210 236 252 293 315 336 356 393

TAP 3 175 193 224 257 294 312 330 350 382

TAP 4 199 234 257 291 309 333 366 395 423

TAP 1 86 102 124 143 165 193 218 246 270

TAP 2 103 130 148 172 192 219 248 277 309

TAP 3 144 163 192 216 250 275 294 322 357

TAP 4 196 224 255 287 306 339 371 395 429

Motor Watts @ Various External Static Pressures - in. wg.

Page 5

CBX40UHV042 BLOWER PERFORMANCE

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

“AJUST”

Jumper Setting

“HEAT” Speed “COOL” Speed

Jumper Speed Positions

NOTES:

NORM

cfm

1100 1320 1540 1760 1100 1320 1540 1760

1000 1200 1400 1600 1000 1200 1400 1600

900 1080 1260 1440 900 1080 1260 1440

cfm

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

S Lennox Harmony III™ Zone Control applications - minimum blower speed if 450 cfm.

CBX40UHV‐042 BLOWER MOTOR WATTS AT “+” (Plus) AHC SETTING (“Adjust” Jumper at “+” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

CBX40UHV‐042 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (“Adjust” Jumper at NORM Setting)

TAP 1 124 154 177 204 240 260 296 326 363

TAP 2 179 227 255 287 336 356 394 451 486

TAP 3 294 339 387 425 463 489 518 550 600

TAP 4 405 456 510 553 607 647 686 743 777

TAP 1 122 146 173 198 224 259 292 329 360

TAP 2 186 230 254 289 332 361 404 438 477

TAP 3 284 335 387 413 455 483 526 551 600

TAP 4 413 475 517 570 632 569 715 750 782

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

AHC Jumper Speed

Positions

“HEAT” SPEED

COOL SPEED

TAP 1 97 123 146 179 205 225 258 292 327

TAP 2 144 180 209 230 266 295 334 375 410

TAP 3 226 259 307 342 380 405 448 482 525

TAP 4 323 369 401 449 491 516 563 593 640

TAP 1 93 118 142 166 197 225 247 280 314

TAP 2 148 179 207 231 268 311 333 377 405

TAP 3 229 263 298 332 386 408 446 484 534

TAP 4 327 375 403 448 489 523 557 589 646

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

CBX40UHV‐042 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (“Adjust” Jumper at “-” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 80 105 128 148 173 206 233 265 287

TAP 2 113 144 172 193 219 265 286 312 349

TAP 3 168 198 238 265 293 332 368 415 442

TAP 4 239 285 315 362 398 428 465 503 544

TAP 1 76 100 123 148 169 203 230 260 279

TAP 2 115 145 169 190 217 258 288 315 349

TAP 3 166 199 236 263 296 330 380 415 449

TAP 4 241 289 321 366 396 431 472 505 544

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

Page 6

CBX40UHV

CBX40UHV048 AND CBX40UHV-060 BLOWER PERFORMANCE

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

Jumper Speed Positions

“AJUST”

Jumper Setting

“HEAT” Speed “COOL” Speed

NOTES:

NORM

cfm

1850 1960 2090 2150 1625 1820 2055 2145

1705 1800 1900 2005 1425 1625 1805 2005

1560 1625 1720 1770 1205 1375 1555 1725

cfm

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

S Lennox Harmony III™ Zone Control applications - minimum blower speed if 450 cfm.

CBX40UHV‐048 and CBX40UHV-060 BLOWER MOTOR WATTS AT “+” (Plus) AHC SETTING (“Adjust” Jumper at “+” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 418 478 539 551 599 646 675 704 748

TAP 2 492 540 585 642 684 732 761 797 834

TAP 3 594 645 721 762 811 863 874 918 976

TAP 4 653 713 755 809 861 909 941 974 1028

TAP 1 312 342 373 414 443 475 512 558 587

TAP 2 407 459 503 552 591 627 670 718 752

TAP 3 581 646 691 737 792 826 863 900 942

TAP 4 646 695 746 804 873 900 934 976 1032

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

CBX40UHV‐048 and CBX40UHV-060 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (“Adjust” Jumper at NORM Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 325 366 404 444 475 520 566 598 636

TAP 2 369 421 465 516 560 587 616 666 717

TAP 3 436 488 540 586 621 671 710 743 789

TAP 4 523 581 636 684 738 789 816 852 894

TAP 1 226 259 293 322 350 387 413 446 472

TAP 2 312 355 382 423 450 492 520 570 615

TAP 3 388 421 482 523 564 606 641 695 741

TAP 4 538 599 647 686 718 792 820 853 888

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

CBX40UHV

Page 7

CBX40UHV‐048 and CBX40UHV-060 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (“Adjust” Jumper at “-” Setting)

AHC Jumper Speed

Positions

HEAT SPEED

COOL SPEED

TAP 1 271 302 341 368 398 439 473 504 545

TAP 2 286 329 356 393 423 462 504 550 572

TAP 3 327 374 407 455 504 526 563 608 638

TAP 4 355 404 442 496 539 560 602 643 684

TAP 1 124 163 180 209 231 271 300 322 357

TAP 2 192 233 252 282 321 356 390 422 449

TAP 3 268 311 336 367 393 432 469 523 538

TAP 4 328 376 420 463 486 536 572 612 657

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Motor Watts @ Various External Static Pressures - in. wg.

PARTS ARRANGEMENT

ELECTRIC HEAT

SECTION

CONTROL BOX

BLOWER

COMPARTMENT

BLOWER ACCESS

PANEL

COIL ACCESS

PANEL

FILTER ACCESS

PANEL

HORIZONTAL

DRAIN PAN

COIL

UP-FLOW/DOWN-FLOW

DRAIN PAN

FILTER

Figure 1. CBX40UHV Parts Arrangement

Page 8

CBX40UHV

LIMIT

RELAY

CIRCUIT BREAKER

LIMIT

Figure 2. CBX40UHV Control Box

APPLICATION

CBX40UHV air handlers are designed for HFC-410A applications only. All major air handler components

must be matched according to Lennox reco m mendation s for the u n i t to be covered under warranty. Refer to the Engineering Handbook for approved

system matchups. A misapplied system will cause erratic operation and can result in early unit failure. The units come with factory installed check and expansion valve for all applications. It has been installed internally and is accessible if required.

ELECTROSTATIC DISCHARGE (ESD)

PRECAUTIONS AND PROCEDURES

CAUTION

Electrostatic discharge can affect electronic compo nents. Take precautions during unit installation and service to protect the unit's electronic controls. Pre cautions will help to avoid control exposure to electro static discharge by putting the unit, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface before perform ing any service procedure.

HEATING ELEMENTSHEATING ELEMENTS

AIR HANDLER CONTROL

UNIT COMPONENTS

Control Box

The CBX40UHV control box is shown in figure 2. Line voltage and electric heat connections are made in the control box. Optional electric heat fits through an opening located in the center of the control box. When electric heat is not used, knockout plates cover the opening. The electric heat control arrangement is detailed in the electric heat section of this manual.

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 1.

Table 1. Links

Application

Remove Links

Harmony IIIt DS to R

Heat Pump R to O

Two-Stage Cooling Y1 to Y2

Transformer (T1)

All CBX40UHV 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.

CBX40UHV

Page 9

208 / 240 VOLT TRANSFORMER

PRIMARY

ORANGE

240 VOLTS

RED

SECONDARY

BLUE

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.

208 VOLTS

BLACK

YELLOW

Figure 3 Transformer

Plastic Drain Pans

Both up-flow/down-flow and horizontal drain pans are provided and installed on the CBX40UHV 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.

Coil

All CBX40UHV 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.

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.

The discharge air sensor should be mounted downstream of the electric heat elements as illustrated in Figure 4, 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 Air Handler Control and the discharge air sensor should not exceed 10' (3m) when wired with 18-gauge thermostat wire.

Outdoor Air Sensor (OAS)

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

Page 10

CBX40UHV

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 (AHC) HAS TWO SCREW TERMINALS MARKED DISCHARGE AIR SENSOR. THE SENSOR IS REQUIRED FOR EVENHEATER MOUNTED AND MUST BE ORDERED SEPARATELY (CATALOG # 88K38).

OPERATION, IS FIELD

OPTIONAL DISCHARGE

SENSOR (DAT)

TEMPERATURE RESISTANCE

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

SEE TABLE 6 - STAGES FOR FUNCTION OF EACH PIN POSITION.

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

CBX40UHV AIR HANDLER CONTROL

PART NO. 43W19

PLENUM

NOTE - EVENHEATER MODE CANNOT BE ENABLED WITH HARMONY III DUE TO EACH CONTROL REQUIRING ITS OWN DISCHARGE AIR SENSOR.

Figure 4. CBX40UHV-XXX-230-6-01

CBX40UHV

Page 11

CONNECT WIRES TO DISCHARGE AIR SENSOR

TERMINAL ON AIR HANDLER CONTROL.

DETAIL A

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

ELECTRIC HEAT RELAY

PART NO. 49W91

22V DIRECT CURRENT COIL

19 IN.

(483 MM)

5-1/2 IN.

(140 MM)

SENSOR

(CENTER SIDE-T0 -SIDE)

AIR HANDLER CONTROL

DISCHARGE SENSOR

(DAT)

TEMPERATURE RESISTANCE

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

FASTEN THE PROBE

BRACKET TO THE

PLENUM WITH TWO

SELF-TAPPING SHEET

METAL SCREWS.

PLENUM

30 AMP CONTACT

RATING

9-PIN

CONNECTOR

9-PIN CONNECTOR

DETAIL B

SEE TABLE 6 - STAGES FOR FUNCTION OF EACH PIN POSITION.

NOTE — EVENHEAT MODE CANNOT BE ENABLED WITH HARMONY III DUE TO EACH CONTROL REQUIRING ITS OWN DISCHARGE AIR SENSOR.

SECURING SCREWS

AIR HANDLER CONTROL L-BRACKET MOUNTING PLATE

CBX40UHV AIR HANDLER CONTROL

PART NO. 50W28 or 65W70

CONNECT WIRES TO DISCHARGE AIR SENSOR

TERMINAL ON AIR HANDLER CONTROL.

Figure 5. Component Connections (CBX40UHV-XXX-230-6-02)

Page 12

CBX40UHV

FIELD WIRING

AIR CONDITIONER

UNIT

(TWO-STAGE)

RED

BROWN

YELLOW

BLUE

BLACK

HEAT PUMP UNIT

(TWO-STAGE)

CBX40UHV

COMFORTSENSET

Figure 6. Field Wiring — Cooling Application (Non-Communicating)

CBX40UHV

W1 W1

COMFORTSENSET

7000

O. D.

SENSOR

(X2658)

AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3.

R CONNECTION REQUIRED FOR AIR CONDITIONER UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE

COMFORTSENSE 7000 WITH THE LSOM 2.

L CONNECTION WIRED ON UNITS WITH LSOM.

IMPORTANT — USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 12, CBX40UHV 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.

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 WITH THE LSOM 2.

FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON HEAT PUMP TO Y2 ON CBX40UHV.

IMPORTANT — USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 12, CBX40UHV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

AIR HANDLER

CONTROL

Y1-Y2

2-STAGE

COMPR

R-O HEAT PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

OUT

CBX40UHV

Y2Y2

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

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

CUT ON-BOARD LINK R -O.

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

Figure 7. Field Wiring — Heat Pump (Non-Communicating)

Page 13

OUTDOOR

SENSOR

(X2658)

RED

BLK

PUR

EDA UNIT

CBX40UHV

PUR

BLK

FAN RELAY

YEL

BLU

BLK

BRN

OUTDOOR UNIT

NOTES /1\

NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM

/2\ NOT REQUIRED WITH SINGLE‐SPEED OUTDOOR FAN

NOT REQUIRED FOR SINGLE STAGE

/3\

AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL

JUMPERS BETWEEN W1 TO W2 AND W2 TO W3.

RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 WITH THE LSOM 2.

COMFORTSENSEt 7000 THERMOSTAT

CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION

IMPORTANT — USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 12, CBX40UHV 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 8. Cooling Application — Humiditrol

OUTDOOR UNIT

RED

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

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 12, CBX40UHV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

and Second-Stage Outdoor Fan Relay Wiring

(Non-Communicating)

RED BLACK PURPLE

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

CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION

CBX40UHV

CUT ON-BOARD LINK R -O.

COMFORTSENSEt 7000 THERMOSTAT

TERMINAL IS USED.

OUTDOOR

SENSOR

(X2658)

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

Figure 9. Heat Pump Application — Humiditrol

(Non-Communicating)

Page 14

and Second-Stage Outdoor Fan Relay Wiring

CBX40UHV

Thermostat Connections

Table 2 (CBX40UHV-XXX-230-6-ALL)

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.

CBX40UHV

Page 15

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.

Table 3. Air Handler Control Connections —

Communicating (CBX40UHV-XXX-230-6-ALL)

Label Label Function

R 24VAC

Thermostat

Outdoor Unit

Link

Table 4. 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).

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.

Thermostat Wire Length

(CBX40UHV-XXX-230-6-02)

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

F (35ºC) minimum,

Table 5. Run Length — Non-Communicating

(CBX40UHV-XXX-230-6-01 and -02)

Wire Run Length AWG # Insulation/Core Types

Less than 100' (30m) 18

More than 100' (30m) 16

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

F (35ºC) minimum,

Air Handler Control 9-Pin Connector

1. Air Handler ONLY - 2-wire harness (Wired to points 7 and 8) from the factory provides 230 volt power to Air Handler Control.

2. Air Handler with ECB40 Electric Heat - 8-wire harness (Wired as noted in table 6)

NOTE - See Figure 4

Table 6. Stages

Position &

Wire Color

1 red Heat stage 1 relay coil

2 orange Heat stage 2 relay coil

3 yellow Relay coil return

4 black Heat stage 3 relay coil

5 brown Heat stage 4 relay coil

6 blue Heat stage 5 relay coil

7 black L1 230VAC supply from heater kit

8 red L2 230 VAC supply from heater kit

9 Not Used

Function / Description

Page 16

CBX40UHV

AIR HANDLER CONTROL BUTTON, DISPLAY AND JUMPERS

Use figure 10 as reference for jumper settings. If any of the reference jumpers are missing, the Air Handler Control will display Error Code 130 as per table 13, and the Air Handler Control will automatically use the factory default setting show in figure 11)

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).

Delay Profile 1

Indoor blower cooling profile, delay for cooling and heat pump operations are selected by placing the jumper in appropriate position on five-pin header (four position options).

S 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.

S For heat pump cooling operation all 4 profiles are

operational.

If the jumper is missing the AHC will activate the Configuration Jumper is Missing alarm and will automatically use the default factory setting. See figure 11 for jumper configurations.

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

Cooling — Air Conditioner and Heat Pump:

OFF

%CF

M COOLING DEMAND

Delay Profile 2

100% CFM

COOL ING

DEMAND

OFFOFF

100% CFM

45 SEC.

OFF

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

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

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

OFF

CBX40UHV

Page 17

CBX40UHV JUMPER & LINK GUIDE

1−STG COMPRESSOR

2−STG COMPRESSOR

COOLING MODE BLOWER SPEED

(COOLING & HP MODE)

HIGH

SPEED

MEDIUM−HIGH

SPEED

MEDIUM−LOW

SPEED

LOW

SPEED

FUSE 3 AMP

XFMR

24V

24 VAC

COM

XFM LINE

BLOWER

ADJUST SELECTION

NORMAL

NORM

−

(+ 10%)

SETTING

NORM

−

(−10%)

SETTING

NORM

−

HEATING MODE

BLOWER SPEED

(ELECTRIC HT MODE)

HIGH

SPEED

MEDIUM−HIGH

SPEED

MEDIUM−LOW

SPEED

LOW

SPEED

J10

NORM + −

HEAT

1234

COOL

1234

DELAY

1234

ADJUST

PUSH

BUTTON

HUMIDIFICATION

SMART AUTO

EVENHEAT

BLOWER

J11

ONLY CFM

1234

COOLING MODE

BLOWER RAMPING

(COOLING MODE UNLESS NOTED)

DELAY

PROFILE #4 OFF−50%−82%− 100%−50%−OFF

DELAY

PROFILE #3

OFF−82%−100%−OFF

DELAY

PROFILE #2 CLG OFF−100%−100%−OFF HP OFF−30sOFF−100%−100% OFF

DELAY

PROFILE #1

OFF−100%−OFF

7−SEGMENT

LED DISPLAY

CUT FOR OPTION

Y1−Y2

2−STAGE

COMPR

115

100

130

OUTDOOR

SENSOR

FUTURE

USE

CONTINUOUS FAN

MODE BLOWER SPEED

MEDIUM−HIGH

MEDIUM−LOW

ON−BOARD LINK

OPTION SELECTION

PUMP

DEHUM

R−O

HEAT

R−DS

HARMONY

DISCHARGE

AIR SENSOR

FACTORY

JUMPER

HIGH SPEED (100%)

SPEED

(70%)

SPEED

(38%)

LOW

SPEED

(28%)

2−STAGE

(JUMPERS Y1 to Y2)

COMPRESSOR LINK

HEAT PUMP LINK

(JUMPERS R to O)

HARMONY LINK

(JUMPERS R to DS)

DEHUMIDIFICATION−

STANDARD HEAT MODE

(STAGED BY TSTAT)

W1 W2 G Y2 Y1 C R DH H L O DS

DEGREE TARGET

TEMPERATURE

Y1−Y2

DO NOT CUT

COMPR

2 STAGE

A/C UNIT

DO NOT CUT

R−0

HEAT

PUMP

NO HARMONY ZONING

OR NO

COMFORTSENSE 7000

W/ DS CONNECTION

DO NOT CUT

R−DS

DEHUM

−CUT ON−BOARD LINK (SOLDER TRACE)

THROUGH BOTH LAYERS ON THE CONTROL BOARD IMPORTANT: USE CARE WHEN CUTTING LINKS TO

PREVENT DAMAGE TO CONTROL.

Y1−Y2

COMPR

2 STAGE

HEAT PUMP UNIT

CUT LINK

HARMONY ZONING

C0MFORTSENSE 7000

W/ DS CONNECTION

HARMONY

CUT LINK

COMPLETELY

CUT LINK

R−0

HEAT

HUMIDIFICATION MODE

24VAC OUTPUT ON ”H”

(DEFAULT)

STANDARD

HEAT MODE

110

115

130

EVENHEATER® MODE

−ENABLED WITH OPTIONAL DISCHARGE AIR SENSOR

DISCHARGE

100

DEGREE

TARGET

115

DEGREE

TARGET

130

DEGREE

TARGET

110

115

130

110

115

130

110

115

130

110

115

130

FACTORY DEFAULT SETTING

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

PUMP

SMART

R−DS

DEHUM

HARMONY

AUTO

Figure 11. CBX40UHV-XXX-230-6-01

Page 18

CBX40UHV

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+-

1234

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

HEAT

COOL

DELAY

7-SEGMENT LED

HUMIDITROL

HUMIDIFICATION

AUTO

SMART

EVENHEAT

100

BLOWER

ONLY CFM

1234

I + I -RC

THERMOSTAT

115

130

Y1-Y2

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

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

CBX40UHV

Figure 12. Air Handler Configuration (CBX40UHV-XXX-230-6-02 or higher)

Page 19

VARIABLE SPEED ECM BLOWER MOTOR

Blower Motor (B3)

To Remove Blower From Unit: Remove wiring jack plug and

three screws and slide blower out.

Figure 13. Blower Motor (B3)

WARNING

During blower operation, the ECM motor emits energy that may interfere with pacemaker operation. Interfer ence is reduced by both the sheet metal cabinet and dis tance.

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 solid‐ state control ler is permanently attached to the motor. The controller is 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 14. The stator windings are split into three poles which are electrically connected to the controller. This arrangement allows 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 CBX40UHV line.

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 CBX40UHV blower motors use single phase power. An external run capacitor is not used. The motor uses permanently lubricated ball‐type bearings.

STATOR

CONTROLLER

Figure 14. Blower Motor Components

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.

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.

(WINDINGS)

BEARING

OUTPUT

SHAFT

ROTOR

Page 20

CBX40UHV

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.

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.

DANGER

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)

To verify motor operation see steps below and figure 15.

NOTE: If the communication channel is disrupted (loss of communication and and 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.

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%.

P48 5 PIN

J48 5 Pin

J49 4 Pin

P49 4 PIN

MOTOR with INTEGRATED

CONTROLLER

J48 5 Pin Line Voltage Connector

J49 4 Pin Control Connector

Figure 15. Regal-Beloit — Blower B3 Harness

Connectors

CBX40UHV

Page 21

P48 5 Pin

P49 4 Pin

J48 Connector installed on motor

P49 4 Pin

P48 5 PIN

P49 4 PIN

120v

230v

J48 Connector

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 18) 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 18). 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

24v Transformer

J49 Connector

Figure 16. Regal-Beloit — Troubleshooting

Page 22

Figure 17. Typical Digital Multimeter

CBX40UHV

CONTROL MODULE

3-PIN JACK

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

19. 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

THERMISTOR

NTC

Figure 18. 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.

P48 (5-PIN)

P48 5 Pin

Figure 19. Motor Test (Emerson)

P49 (4-PIN)

MOTOR

J48 5 Pin Line Voltage Connector

CONTROL MODULE

P49 4 Pin

CBX40UHV

J49 4 Pin Control Connector

Figure 20. Indoor Blower Motor (B3) Control Connections (Emerson)

Page 23

P48 (5-PIN)

HARNESS

P49 (4-PIN) HARNESS

P48 (5-PIN) HARNESS

P48 (5-PIN)

HARNESS

MOTOR

CONTROL MODULE

120v

Figure 21. J48 Test (Emerson)

P49 (4-PIN) HARNESS

230v

P49 4 Pin

J48 Connector

P48 (5-PIN) HARNESS

MOTOR

CONTROL MODULE

Figure 22. J49 Test (Emerson)

J49 4 Pin

Page 24

J49 Connector

24v Transformer

CBX40UHV

OPTIONAL ECB40 ELECTRIC HEAT

3. Terminal Strip (TB2)

Match-ups and Ratings

The tables on the following pages show all approved CBX40UHV to ECB40 matchups and electrical ratings.

Electric Heat Components

ECB40 parts arrangement is shown in figure 23. 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 7 for set points.

TABLE 7

Limit

Open° Close°

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. T h e rel a y s en e r gize different stages of heat, as well as the blower. The blower is always first on and last off.

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 the wi re 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.

CBX40UHV

Page 25

ECB40-9CB P VOLTAGE SHOWN

Elements HE1 and HE2

Location of CB1

Relay K33

Primary Limit S15 and Secondary Limit S20

Relay K32

Figure 23. Electric Heat

Page 26

CBX40UHV

ELECTRIC HEAT DATA - CBX40UHV-024 AND CBX40UHV-030

SINGLE PHASE ELECTRIC HEAT CBX40UHV-024 CBX40UHV-030

Model Number

No.

Stages

Volts InputkWInput

Btuh

Input

Blower Motor

Full Load

Amps

Minimum

Circuit

Ampacity

Maximum

Overcurrent

Protection

208 1.9 6,400 4.0 17 20 - - - - - - - - - - - -

2.5 kW 4 lbs.

ECB40-2.5 (34W86)

Terminal Block

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 - - - - - - - - - - - -

25 23 - - -4 25 - - -

25 24 - - -

25 25 - - -4 25 - - -

30 28 - - -4 30 - - -

30 29 - - -4 30 - - -

30 30 - - -4 30 - - -

35 32 - - -4 35 - - -

35 33 - - -4 35 - - -

35 35 - - -

45 41 - - -4 45 - - -

45 43 - - -4 45 - - -

45 45 - - -4 45 - - -

50 46 - - -4 50 - - -

50 48 - - -4 50 - - -

4 kW 4 lbs.

5 kW 4 lbs.

6 kW 4 lbs.

8 kW 5 lbs.

9 kW 5 lbs.

ECB40-4 (55W89)

Terminal Block

ECB40-4CB (55W90)

30A Circuit breaker

ECB40-5 (34W87)

Terminal Block

ECB40-5CB (34W90)

35A Circuit breaker

EB40-6 (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

208 3.0 10,250 4.0 23

220 3.4 11,450 4.0 24

230 3.7 12,550 4.0 25

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

208 3.8 12,800 4.0 28

220 4.2 14,300 4.0 29

230 4.6 15,700 4.0 30

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

208 4.5 15,400 4.0 32

220 5.0 17,100 4.0 33

230 5.5 18,800 4.0 35

240 6.0 20,500 4.0 37 40 37 - - - 40 - - -

208 6.0 20,500 4.0 41

220 6.7 22,900 4.0 43

230 7.3 25,100 4.0 45

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

208 6.8 23,100 4.0 46

220 7.6 25,800 4.0 48

230 8.3 28,200 4.0 50 60 50 - - - 60 - - -

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

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

12.5 kW 10 lbs.

ECB40-12.5CB (34W94)

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

breaker

220 10.5 35,800 4.0 - - - - - - 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

15 kW 12 lbs.

ECB40-15CB (34W95)

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

breaker

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

230 13.8 47,000 4.0 - - - - - - 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.

Minimum

Circuit

Ampacity

Circuit Circuit

1 2 1 2

Maximum

Overcurrent

Protection

25 - - -

35 - - -

254 40

304 45

304 50

CBX40UHV

Page 27

ELECTRIC HEAT DATA - CBX40UHV-036

SINGLE PHASE ELECTRIC HEAT CBX40UHV-036

Minimum

Circuit

Ampacity

Circuit Circuit

1 2 1 2

Model Number

ECB40-4 (55W89) 4 kW 4 lbs.

Terminal Block

ECB40-4CB (55W90)

35A Circuit breaker

ECB40-5 (34W87) 5 kW 4 lbs.

Terminal Block

ECB40-5CB (34W90)

35A Circuit breaker

ECB40-6 (34W88) 6 kW 4 lbs.

Terminal Block

ECB40-6CB (34W91)

40A Circuit breaker

ECB40-8 (34W89) 8 kW 5 lbs.

Terminal Block

ECB40-8CB (34W92)

50A Circuit breaker

9 kW 5 lbs.

12.5 kW 10 lbs.

15 kW 12 lbs.

20 kW 19 lbs.

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

No.

Stages

Volts

Input

Btuh

Input

Blower

Motor Full

Load Amps

208 3.0 10,250 5.6 25 - - -

220 3.4 11,450 5.6 26 - - -

230 3.7 12,550 5.6 27 - - -

240 4.0 13,650 5.6 28 - - -

208 3.8 12,800 5.6 30 - - -

220 4.2 14,300 5.6 31 - - - 35 - - -

230 4.6 15,700 5.6 32 - - - 35 - - -

240 5.0 17,100 5.6 34 - - - 35 - - -

208 4.5 15,400 5.6 35 - - -

220 5.0 17,100 5.6 35 - - -

230 5.5 18,800 5.6 37 - - - 40 - - -

240 6.0 20,500 5.6 39 - - - 40 - - -

208 6.0 20,500 5.6 44 - - -

220 6.7 22,900 5.6 45 - - -

230 7.3 25,100 5.6 47 - - - 50 - - -

240 8.0 27,300 5.6 49 - - - 50 - - -

208 6.8 23,100 5.6 48 - - -

220 7.6 25,800 5.6 50 - - -

230 8.3 28,200 5.6 52 - - - 60 - - -

240 9.0 30,700 5.6 54 - - - 60 - - -

208 9.4 32,000 5.6 26 38 30

220 10.5 35,800 5.6 27 40 30

230 11.5 39,200 5.6 28 42 30 45

240 12.5 42,600 5.6 29 44 30 45

208 11.3 38,400 5.6 30 45

220 12.6 43,000 5.6 31 48 35

230 13.8 47,000 5.6 32 50 35

240 15.0 51,200 5.6 33 52 35 60

208 15.0 51,200 5.6 48 50

220 16.8 57,300 5.6 50 53

230 18.4 62,700 5.6 52 55 60 60

240 20.0 68,200 5.6 54 57 60 60

208 6.0 20,500 5.6 28 - - - 30 - - -

220 6.7 22,900 5.6 29 - - - 30 - - -

230 7.3 25,100 5.6 30 - - - 30 - - -

240 8.0 27,300 5.6 32 - - - 35 - - -

208 7.5 25,600 5.6 34 - - - 35 - - -

220 8.4 28,700 5.6 35 - - - 35 - - -

230 9.2 31,400 5.6 36 - - - 40 - - -

240 10.0 34,100 5.6 38 - - - 40 - - -

208 11.3 38,400 5.6 47 - - - 50 - - -

220 12.6 43,000 5.6 48 - - - 50 - - -

230 13.5 47,000 5.6 50 - - - 50 - - -

240 15.0 51,200 5.6 53 - - -

Maximum

Overcurrent

Protection

25 - - -

30 - - -

35 - - -

45 - - -

50 - - -

50 60

60 - - -

Page 28

CBX40UHV

ELECTRIC HEAT DATA - CBX40UHV-036 (Continued)

THREE PHASE ELECTRIC HEAT CBX40UHV-036

Model Number

No.

Stages

Volts InputkWInput

Btuh

Input

Blower

Motor Full

Load Amps

Minimum

Circuit

Ampacity

Maximum

Overcurrent

Protection

208 15.0 51,200 5.6 33 26 35

20 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.

ECB40-20CB (35W01)

(2) 35A Circuit breaker

220 16.8 57,300 5.6 35 28 35

230 18.4 62,700 5.6 36 29

240 20.0 68,200 5.6 37 30

40 35

ELECTRIC HEAT DATA - CBX40UHV-042, CBX40UHV-048, AND CBX40UHV-060

SINGLE PHASE ELECTRIC HEAT CBX40UHV-042, CBX40UHV-048 and CBX40UHV-060

Model Number

No. of

Stages

Volts InputkWInput

Btuh

Input

Blower

Motor Full

Load

Amps

Minimum

Circuit Ampacity

Circuit1Circuit2Circuit3Circuit1Circuit2Circuit

Maximum

Overcurrent Protection

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

1 208 3.0 10,250 7.4 27 - - - - - -

30 - - - - - -

1 208 3.8 12,800 7.4 32 - - - - - - 35 - - - - - -

1 208 4.5 15,400 7.4 37 - - - - - - 40 - - - - - -

1 208 6.0 20,500 7.4 46 - - - - - - 50 - - - - - -

2 208 6.8 23,100 7.4 51 - - - - - - 60 - - - - - -

2 208 9.4 32,000 7.4 29 38 - - - 30

2 208 11.3 38,400 7.4 32 45 - - - 35

40 - - -

45 - - -

20 kW 19 lbs.

25 kW 19 lbs.

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

ECB40-25CB (34W97) (1) 60A & (2) 45A Circuit breaker

CBX40UHV

2 208 15.0 51,200 7.4 50 50 - - -

3 208 18.8 64,100 7.4 47 38 38

Page 29

50 - - -

ELECTRIC HEAT DATA - CBX40UHV-042, CBX40UHV-048, AND CBX40UHV-060 (Continued)

SINGLE PHASE ELECTRIC HEAT CBX40UHV-042, CBX40UHV-048 and CBX40UHV-060

Minimum

Circuit Ampacity

Model Number

No. of

Stages

Volts InputkWInput

Btuh

Input

Blower

Motor Full

Load

Amps

Circuit1Circuit2Circuit3Circuit1Circuit2Circuit

THREE PHASE ELECTRIC HEAT

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

8 kW 5 lbs.

ECB40-8 (34W98)

Terminal block

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 36 - - - - - - 40 - - - - - -

10 kW 6 lbs.

ECB40-10 (34W99)

Terminal block

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 40 - - - - - - 40 - - - - - -

208 11.3 38,400 7.4 49 - - - - - - 50 - - - - - -

15 kW 12 lbs.

ECB40-15CB (35W00)

50A Circuit breaker

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

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

240 15.0 51,200 7.4 55 - - - - - -

208 15.0 51,200 7.4 36 26 - - -

20 kW 19 lbs.

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

220 16.8 57,300 7.4 37 28 - - -

230 18.4 62,700 7.4 38 29 - - -

240 20.0 68,200 7.4 40 30 - - -

208 18.8 64,100 7.4 42 33 - - -

25 kW 19 lbs.

ECB40-25CB (35W02)

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

breaker

220 21.0 71,700 7.4 44 34 - - -

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

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

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.

Maximum

Overcurrent Protection

60 - - - - - -

30 - - -

40 35 - - -

35 - - -

OPTIONAL HUMIDITY CONTROL (A20)

ComfortSense

7000 Thermostat

The Lennox ComfortSenset 7000 thermostat (shown below) monitors indoor humidity conditions and creates a dehumidification demand in response to indoor humidity just as it creates a cooling demand in response to indoor temperature. This thermostat adjusts compressor speed and indoor blower speed to maintain humidity at a comfortable level.

COOLING

TUE OCT 23 1:15PM

Principles of cooling with drier air

The humidity comfort range for humans is between 40 and 60 percent relative humidity (RH). 50% RH is the recommended initial setpoint until personal comfort level is established. The personal comfort level will vary with humidity as with temperature. For example, if air at 75ºF (24ºC) and 50% RH is changed to 60%, the air will feel much warmer. Likewise, if the air is reduced to 40% RH, it will feel much cooler.

Even when inactive, the body evaporates a large amount of moisture away from the skin. This evaporation produces a cooling effect (during wintertime, this phenomenon is called “wind-chill”). Dry air is capable of absorbing more moisture away from the skin, thereby increasing the cooling effect.

When the ComfortSense 7000 thermostat senses that the indoor humidity level is above the control setpoint, the control places the indoor fan and outdoor unit in a dehumidification mode. To produce drier air, the indoor fan will slow down the speed of the air crossing the indoor coil. Because the air is moving much slower than normal, the indoor coil is allowed to remove moisture from the air (a higher percentage of the air passing over the coil is cooled

Page 30

CBX40UHV

to its dew point removing more moisture). At the same time, the two‐stage outdoor unit will switch to high-speed to produce a colder indoor coil. The colder indoor coil and slower moving air combine to produce drier supply air.

NOTE - The indoor blower speed is reduced in order to slow the air speed across the indoor coil. The supply air exiting the unit may not feel as forceful. This is normal. Remember that when the unit is in dehumidification mode, the comfort level is increased because the unit is producing cooler, drier air.

The exact sequence of operation to produce cooler, drier air is described in the following section.

Other conditions adversely affecting ComfortSense 7000 thermostat performance

Blower speed selection can adversely affect ComfortSense 7000 thermostat performance. Higher blower speeds should be selected to provide maximum sensible cooling, while lower blower speeds should be selected to provide maximum humidity removal. Refer to the air handler and thermostat installation instructions.

It is recommended that the indoor blower be left in AUTO mode at all times. During dehumidification mode, the indoor coil and drain pan may become saturated with moisture. If the indoor blower is left in ON mode, much of that moisture can be re-evaporated into the living space between thermostat demands. This can create a constant demand for humidity removal and may cause extended compressor run times. Refer to table 8 for jumpers per application.

Table 8. Jumpers Required

Humidity Control

OFF Heat Pump one-stage DS to Y1 &

ON Heat Pump one-stage Y1 to Y2

Dehumidification is provided only when the thermostat is in cool mode and may be set in the range of 45% to 60% RH. Dehumidification D terminal wires to variable speed blower (reverse logic/active on low signal 24VAC). When the unit is

Outdoor Unit type

Condensing Unit

Operation

Compressor type

two-stage DS to Y1

one-stage DS to Y1 &

two-stage DS to Y1 &

two-stage None

one-stage Y1 to Y2 &

two-stage O to R

Jumpers required

Y1 to Y2

Y1 to Y2 & O to R

O to R

in heating mode, the dehumidification function is off. The default mode for dehumidification is OFF and needs to be activated during installation.

The D terminal is active whenever the ComfortSense 7000 thermostat is powered, EXCEPT when there is a dehumidification demand. This means that the D terminal has 24VAC on it even in HEAT and OFF modes.

BASIC mode

Dehumidification only with a cooling demand

. COOL is on, then D is active (reverse logic off), and G comes on (if not already on), Y1 and Y2 (if available) is on.

PRECISION mode

Dehumidification with or without a cooling demand

. COOL is on, the D is active (reverse logic, off), and G, Y1, and Y2 (if available) are on. Note that H is inactive (off) during dehumidification. The D terminal controls dehumidification. When a dehumidification demand is present, the D terminal becomes de‐energized. Otherwise, 24VAC is present in off mode and heating mode unless there is a call for dehumidification.

HUMIDITROL

Select this mode when Humiditrol

mode

Enhanced Dehumidification Accessory is installed. Operation is same as PRECISION mode but requires an outdoor sensor.

AUX mode

Select this mode when Whole Home Dehumidifier is used in in a central or central/zoned installation. Operation is same as PRECISION mode and can work with or without AC on but G will be energized.

Turning DEHUMIDIFY ON or OFF

NOTE - One of the dehumidify modes must be turned on in the INSTALLER SETTINGS before you can adjust the dehumidify level in the USER SETTINGS of the ComfortSense 7000 thermostat.

From the OPTIONS screen, scroll to INSTALLER

SETTINGS and press ENTER twice.

Scroll to HUMIDITY SETTINGS; press ENTER. Press the

box below DEHUMIDIFY.

HUMIDITY SETTINGS HUMIDIFY DEHUMIDIFY

| |

Use up/down arrows to scroll to OFF, BASIC, PRECISION,

HUMIDITROL, or AUX; press ENTER.

DEHUM MODE SETTING DEF(OFF) PRECISION

Default setting is 50% RH. Use up/down arrows to change

the %RH; press SAVE.

DEHUM SETPOINT DEFAULT (5O%) 45%

CBX40UHV

Page 31

Setting HUMIDITY OFFSET

The Default setting is 0%. This can be used to offset the displayed and controlled space relative humidity (RH) by up to +/- 10% RH.

1- From the OPTIONS screen, scroll to INSTALLER

SETTINGS and press ENTER twice.

2- Scroll to HUMIDITY OFFSET; press ENTER. Use

arrows to select a new offset. Press SAVE.

HUMIDITY OFFSET DEFAULT(O%) 2%

User Control of Humidification / Dehumidification

If set ON, Humidify and Dehumidify may be adjusted by the user through USER SETTINGS. If installer does not turn either ON, HUMIDITY MODES OFF appears when the USER'S “HUMIDITY SETTING” option is pressed. Humidify controls the relative humidity (RH) between 15 and 45%. Dehumidify controls relative humidity (RH) between 45 and 60%.

User Control of Humidification

1- From the OPTIONS screen, scroll to USER SETTINGS

and press ENTER.

2- Scroll to HUMIDITY SETTINGS; press ENTER. (If both

Humidify and Dehumidify are on, the following screen appears; otherwise go to the step 3). Press the box below HUMIDIFY.

HUMIDITY SETTINGS HUMIDIFY DEHUMIDIFY

| |

3- Use up/down arrows to change the humidity setpoint

(between 15 and 45%); press SAVE.

HUM SETPOINT 45% DEFAULT (45%) 4O%

User Control of Dehumidification

1- From the OPTIONS screen, scroll to USER SETTINGS

and press ENTER.

2- Scroll to HUMIDITY SETTINGS; press ENTER. (If both

Humidify and Dehumidify are on, the following screen appears; otherwise go to the step 3). Press the box below DEHUMIDIFY.

HUMIDITY SETTINGS HUMIDIFY DEHUMIDIFY

| |

3- Use up/down arrows to change the humidity setpoint

(between 45 and 60%); press SAVE.

DEHUM SETPOINT 5O% DEFAULT (5O%) 45%

Page 32

CBX40UHV

UNIT SEQUENCE OF OPERATIONS

Table 9. CBX40UV with ComfortSense

Operating Sequence System Demand System Response

System

Condition

Normal Operation

Dehumidification Call

Normal Operation

Dehumidification call

Dehumidification call ONLY

Step

1 On On On Acceptable 24 VAC High 100%

2 On On On Demand 0 VAC High 70%

1 On On On Acceptable 24 VAC High 100%

2 On On On Demand 0 VAC High 70%

1 On On On Demand 0 VAC High 70%

Thermostat Demand Relative Humidity

Y1 Y2 O G W1 W2 Status D

PRECISION MODE (Operates independent of a Y1 thermostat demand)

7000 Thermostat and Single-Stage Outdoor Unit Operating Sequence

Air

Comp

NO CALL FOR DEHUMIDIFICATION

BASIC MODE (Only active on a Y1 thermostat demand)

Handler

CFM

(COOL)

Comments

Compressor and indoor air handler follow thermostat demand

ComfortSense 7000 ther mostat 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

F from cooling set

point.

CBX40UHV

Page 33

Table 10. CBX40UV, with ComfortSense

7000 Thermostat and Two‐Stage Outdoor Unit Operating Sequence

Operating Sequence System Demand System Response

Air

Handler

CFM

(COOL)

System Condition

Step

Thermostat Demand Relative Humidity

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%

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%

Comments

Compressor and indoor air handler follow thermostat demand

ComfortSense 7000 thermo stat energizes Y2 and de-en ergizes 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 2 from cooling set point.

ComfortSense 7000 thermo stat energizes Y2 and de-en ergizes 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 2 from cooling set point.

Page 34

CBX40UHV

UNIT STATUS AND ALARM CODES

AHC Single Character

Display

Letter or Number



  

 



Action

Unit Size Code (number or letter) displayed represents air handler model size and capacity.

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

Idle mode (decimal point / no unit operation)

Delivered CFM. Example: 

Stage Cooling (Shows active cooling stages)  or 

Dehumidification mode (Unit in dehumidification mode only)

Shown only while in active defrost (Y, W and O call)

Stage heating (Shows number of active electric heat pilot relays)  or  or 

Table 11. AHC System Status Codes





Stage heat pump (shows active heat pump stages)  or  Discharge air sensor temperature (indoor blower must be operating) 

Table 12. 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 electric heat sec



tions. 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 ca pacity.

3-When the correct Unit Sized Code is displayed, RELEASE push button. Selected code will flash for 10 second period. 3-During ten second period, HOLD push button until code stops blinking (three seconds minimum). 3-Air Handler Control will store code in memory and exit



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 the Unit Size

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

Solid

Blinking

CBX40UHV

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 button to confirm command to delete codes. Error codes are cleared.



Page 35

Table 13. AHC Single Character Display — Error Codes (Communicating and Non-Communicating)

Alert

Code





































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-handle) 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 con nections, ohm wires and cycle power. The alarm stops all associated HVAC opera tions 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 temperature/re sistance charts in unit installation instructions. Replace sensor pack if necessary. 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 configura tion, 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.

Page 36

CBX40UHV

Table 13. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (continued)

Alert

Code























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 board

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.

CBX40UHV

Page 37

APPLICATION CONFIGURATION MODIFICATIONS

CBX40UHV units are factory-configured for installation in upflow or horizontal applications with right-hand air discharge. For downflow or horizontal left-hand air discharge, certain field modifications are required.

CBX40UHV Cabinet

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.

Up-Flow Application

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

1. The horizontal drain pan must be removed when the air handler is installed in the upflow position. Removing horizontal drain pan will improve airflow.

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.

3. Install units that have no return air plenum on a stand that is at least 14” (356 mm) from the floor to allow for proper air return. Lennox offers an optional upflow unit stand as listed in table 14.

Table 14. Optional Side Return Stand (Upflow Only)

Model/Size

CBX40UHV-All Sizes

Kit Number

45K32

Down-flow Application

See the installation instructions provided with the downflow kit.

Table 15. Optional Downflow Conversion Kits

(Downflow Only)

Model/Size

CBX40UHV-024, -030, and -036

CBX40UHV-042, -048, and -060

Kit Numbers

83M57

43W10

In downflow applications when used with a ECB40 heat section, a Downflow Additive Base Kit (44K15) will be required. Installation instructions are included with the reference kit.

Horizontal Right-Hand Discharge Application

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

NOTE - When a coil is located above a finished space, a 3/4” (19.1MM) overflow drain line must be installed and connected to a safety pan or to the secondary drain outlet of the coil. Refer to local codes.

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

UPFLOW / DOWNFLOW

DRAIN PAN

HORIZONTAL

DRAIN PAN

NO ADJUSTMENT IS NECESSARY

Up-Flow/

DOWNFLOW

DRAIN PAN

*FOR OPTIMUM PERFORMANCE,

REMOVE HORIZONTAL DRAIN PAN.

Figure 24. Upflow Configuration

HORIZONTAL

DRAIN PAN*

Figure 25. Right-Hand Air Discharge Configuration

2. 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” (12.7mm) to avoid damaging the coil or filter. Use sheet metal screws to connect the return and supply air plenums as required.

Horizontal Right-Hand Air Discharge Application in

High Humidity Areas

For horizontal applications in high humidity areas, seal around the drain pan connections plus liquid and suction lines, to prevent humid air from infiltrating into the unit.

Page 38

CBX40UHV

1/2 IN. SCREWS MAXIMUM

ANGLE IRON OR

SHEET METAL

FRONT VIEW

ELECTRICAL INLET

CLEARANCE 4 IN. (102 MM)

END VIEW

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

8. From the upflow position, flip cabinet 90º to the left and set into place. Replace coil assembly. Secure coil in place by bending down the tab on the cabinet support rail as illustrated in figure 27.

TOP CAP ROTATED TO CORRECT POSITION

CABINET

SUPPORT

TOP CAP SCREWS

Figure 26. Suspending Horizontal 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.

Horizontal Left-Hand Discharge Application

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

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

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

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.

90º

BEND

DRAIN PAN

REINSTALLED

HERE

REINSTALLED HERE REMOVED FROM HERE

COIL SHOWN IN UPFLOW POSITION FOR EASY CONVERSION

TOP CAP

90º

BEND

———— DRAIN PLUGS ————

ALIGN HOLES WITH HOLES IN COIL END PLATE.

BACK COIL END SEAL

Figure 27. Field Modification for Left-Hand Air

Discharge

DRAIN PAN SHIPPING LOCATION

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

4. Remove screws from top cap. Remove horizontal drip shield screw located in the center of the back coil end seal.

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

6. Remove plastic plug from left hole on coil front end seal and reinstall plug in back hole. Reinstall horizontal drip shield screw in front coil end seal. Drip shield should drain downward into horizontal drain pan inside coil.

7. 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.

CBX40UHV

Page 39

Figure 28. Left-Hand Discharge Configuration

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

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

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

12. 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” (12.7mm) to avoid damage to coil or filter as illustrated in figure 27. Connect return and supply air plenums as required using sheet metal screws.

Condensate Drain

LEFT-HAND AIR

DISCHARGE

OVERFLOW

DRAIN ON LEFT

UPFLOW OR DOWNFLOW

RIGHT-HAND AIR

DISCHARGE

MAIN DRAIN ON

RIGHT

Figure 29. Main and Overflow Drain Locations based

on 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 30 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 30 for main and overflow drain locations based on coil orientation.

Best Practices

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

S Main and overflow drain lines should NOT be smaller

than both drain connections at drain pan.

S Overflow drain line should run to an area where

homeowner will notice drainage.

S It is recommended that the overflow drain line be

vented and a trap installed. Refer to local codes.

ABOVE

FINISHED

SPACE?

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.

SECONDARY

DRAIN PAN

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

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 #

COMPACT OVERFLOW SWITCH WITH 3/4” FEMALE SLIP INLET

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

AIR HANDLER DRAIN PAN

OVERFLOW

DRAIN

S CONNECTED TO SECONDARY DRAIN PAN

S 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.

OVERFLOW DRAIN LINE

X3169

MAIN

DRAIN

MAIN

DRAIN

CUT TO

REQUIRED

LENGTH

PROVIDED

PIPE NIPPLE

SIDE VIEW

VENT MUST EXTEND

ABOVE HEIGHT OF

COIL DRAIN PAN BY

TWO INCHES (51MM)

CLEAN OUT

PRESS IN

(DO NOT GLUE)

1” X 3/4” X 3/4”

REDUCING

TEE WITH

PLUG

P-TRAP

LENNOX

49P66, J-TRAP #

91P90 OR ANY

PVC SCH 40 P- OR

J-TRAP 3/4”

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

VENT

2”

(51MM)

TRAP DEPTH

TO APPROVED

DRAIN

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

Figure 30. Main Drain

Page 40

CBX40UHV

START‐UP - OPERATION

Preliminary and Seasonal Checks

1. Make sure the unit is installed in accordance with the installation instructions.

2. Inspect electrical wiring, both field and factory installed for loose connections. Tighten as required.

3. Check voltage at disconnect switch. Voltage must be within range listed on the nameplate. If not, consult the power company and have voltage condition corrected before starting unit.

4. Check to ensure that refrigerant lines are in good condition and pipe insulation is intact.

5. Inspect condition of condensate drain pan and piping assembly. Disassemble and clean seasonally.

Cooling Start‐Up

NOTE — The following is a generalized procedure and does not apply to all thermostat control systems. Electronic thermostat control systems may operate differently.

1. Set fan switch to AUTO or ON and move the system selection switch to COOL. Adjust the thermostat to a setting far enough below room temperature to bring on the compressor. Compressor will start and cycle on demand from the thermostat.

2. The refrigerant circuit is charged with HFC-410A refrigerant. See condensing unit rating plate for correct charge amount.

3. Refer to the correct condensing unit service manual for more information.

Heating Start‐Up

1. Set the fan switch to AUTO or ON and move the system selection switch to HEAT. Adjust the thermostat setting above room temperature.

2. The indoor blower immediately starts and the electric heat will stage on based on sequence timing.

Safety or Emergency Shutdown

Turn off unit power at circuit breaker.

Extended Period Shutdown

Turn off thermostat or set to UNOCCUPIED mode. Turn off power to unit. All access panels and covers must be in place and secured. The condensate assembly should be clean and dry for extended period shutdown.

OPERATING CHARACTERISTICS

Blower Operation and Adjustment

NOTE — The following is a generalized procedure and does not apply to all thermostat controls.

1. Blower operation is dependent on thermostat control system.

2. Generally, blower operation is set at thermostat subbase fan switch. With fan switch in ON position, blower operates continuously. With fan switch in AUTO position, blower cycles with demand.

3. In all cases, blower and entire unit will be off when the system switch is in OFF position.

External Static Pressure

Measure tap locations as shown in figure 31.

SUPPLY

MANOMETER

RETURN

UNIT SHOWN IN

Up-Flow POSITION

Figure 31. Static Pressure Test

4. Punch a 1/4” (6mm) diameter hole in supply and return air plenums. Insert manometer hose flush with inside edge of hole or insulation in the supply plenum only. Seal around the hose with permagum. Connect the other end of the hose to the zero end of the manometer. Leave the other end of the manometer open to the atmosphere.

5. With only the blower motor running and the evaporator coil dry, observe and take note of the manometer reading.

6. Repeat step 2 for the return air plenum. Insert manometer hose to the opposite end of the zero side of the manometer. Leave the zero side of the manometer open to atmosphere.

7. Repeat step 3.

8. Add the absolute values of the supply air reading and the return air reading to get the external static pressure of the unit. For example -.20 in. wg. on the return and +.30 in. wg. on the supply result in external static pressure of .50 in. wg. External static should not exceed .80” w.g. (200Pa) Adjust blower motor speed to deliver the air desired according to job requirements.

9. Seal around the holes when the check is complete.

CBX40UHV

Page 41

MAINTENANCE

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.

WARNING

See the tables below for replacement filter sizes.

Table 16. MERV16 Disposable Filter (five inch)

Unit Model No. Filter Size Inches (mm) Catalog #

CBX40UHV-024,

-030 and -036

-CBX40UHV-048,

-042, and -060

20 x 20 x 5 (508 x 508 x 127) X7935

20 x 25 x 5 (508 x 635 x 127) X6675

Table 17. Disposable Filter (one inch))

Unit Model No. Filter Size Inches (mm) Catalog #

CBX40UHV-024,

-030 and -036

-CBX40UHV-048,

-042, and -060

20 x 20 x 1 (508 x 508 x 25) X1963

20 x 25 x 1 (508 x 635 x 25) X1970

NOTE — To use one inch filter bend tabs up as illustrated in figure 32.

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.

At the beginning of each heating/cooling season, the system should be checked as follows:

Filters

IMPORTANT

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

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.

BEND ALL THREE TABS

FILTER

COMPARTMENT

Figure 32. Tabs

Supply Air Blower

1. Check and clean blower wheel.

2. Motors are prelubricated for extended life; no further lubrication is required.

Electrical

1. Check all wiring for loose connections.

2. Check circuit breaker located in unit control box.

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

4. Check amp‐draw using a True RMS amp meter. Typical clamp-on ammeters do not read current accurately.

5. Check to see that heat (if applicable) is operating.

Insulation

Outdoor piping insulation should be inspected yearly for deterioration. If necessary, replace with same materials.

Page 42

CBX40UHV

CONFIGURING UNIT FLOW CHARTS

1. Air Handler Control (AHC) Checkout

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 (AHC) does not recognize unit size code (air handler model size and capacity).

Finished

After all electric heat installations, AHC 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

AHC 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 AHC 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.

T-STAT CALL

ONE (H1)H1TWO (H1-H2)

NUMBER OF HEAT SECTIONS DETECTED

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 AHC. (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.

RECOMMEND — USE FIGURE 12 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

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 — AHC 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, AHC 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 33. Air Handler Control Checkout

CBX40UHV

Page 43

2. Configuring Unit Size Codes

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 AHC 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 34. Configuring 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, AHC 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 44

CBX40UHV

3. Configuring / Detecting Electric Heat Elements

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 12 AS A REFERENCE FOR SETTING

JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

Standard EVENHEAT

Which Heat

Mode?

S Set desired Heating Mode Blower Speed jumper

pin.

S Electric heat is stages by room thermostat. (AHC

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

S Refer to Air Handler Control Checkout flow diagram for

operation.

Yes

To enter electric heat configuration mode, 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



S 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.

S Install and wire discharge air temperature sensor.

S 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) .

S 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,

As each additional heat section is detected, single character LED display on the AHC will display that electric element number. (Example: Last number displayed 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.

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

Finished

Figure 35. Configuring / Detecting Electric Heat Elements

CBX40UHV

Page 45

5. EvenHeater® Operation

INPUTS OUTPUTS

Room Thermostat Demand

Y1 Heat Pump First Stage Heat Pump First Stage

Y1 + Y2

Y1 + W1 and/or W2

Y1 and Y2 + W1 and/or W2

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

Target Discharge Air Temperature Set at 85ºF

Heat Pump First and Second Stage

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

Heat Pump First and Second Stage+ First Electric Heat Sec tion (H1)

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.

Timer delays for

120 seconds

Heat Pump and electric heat

demand?

One Stage More than one stage

Yes

Increase target discharge air temperature by 15Fº

Last room thermostat Heat

up- staging action

Timer delays for 150

seconds

Figure 36. EvenHeater® Operation

Page 46

CBX40UHV

6. EvenHeater® Operation (continued)

Note 1 Activation delay

S 120 seconds if one heat stage is activated or deactivated

S 150 seconds if more than one stage is activated or deactivated.

EVENHEAT Operation

Start Timer Delay

(Note 1)

Yes

Delay Timer

Finished or last

change was up-

stage

Yes

Electric heat ON

Yes

W call with one

Electric Heat

Section ON

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)

Change in Heat

demand from room

thermostat?

Yes

Stop Delay Timer

Increase heat demand.

Y1 (with or without Y2) +

W1 and W2

Adjust Target Discharge

Air Temperature

Delay Timer

Finished or last

change was down-

stage

Yes

More Electric Heat

available

Yes

CBX40UHV

Adjust Target

Discharge Air

Temperature

Turn OFF One

Electric Heat Section

Yes

Discharge air temperature is

within target range?

Above

Measured discharge air

temperature is above or below

target range?

Below

Figure 37. EvenHeater® Operation (continued)

Page 47

Adjust Target Discharge Air

Temperature

Turn ON one Electric

Heat section

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

7. Heat Pump Operation

Air Handler Control AHC) 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 se lected, AHC 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

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

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

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

RECOMMEND - USE FIGURE 11 AS A REFERENCE

FOR SETTING JUMPER CONFIGURATIONS ON THE

heating demand. (45 second indoor blower OFF delay)

highest CFM requested by the heat pump or the electric heat blower speed selection.

Single or Two-Stage Unit

AIR HANDLER CONTROL.

Heating

Room thermostat calls for

stage?

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 11,

CBX40UHV JUMP AND LINK GUIDE FOR FURTHER

DETAILS.

Cooling

Y1-Y2

2-STAGE

COMPR

R-O

HEAT

PUMP

R-DS

DEHUM

HARMONY

CUT FOR OPTION

Air Handler Control (AHC) receives inputs on Y1 terminal.

Y1 terminal on AHC 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 AHC will control the indoor blower according

to the cooling or heating mode blower speed

, ramping and

adjust selection jumper pins.

Room thermostat calls for 2

stage?

YesYes

Y2 terminal on

AHC is configured

as input and passes signal from room thermostat to

outdoor unit. (Note: The outdoor unit control directly

controls the

Y2 terminal is an input to the AHC.

The indoor blower

will be controlled

according to the

jumper pin selections.

outdoor unit

operation.)

Yes

Air Handler Control (AHC) receives inputs on Y1, and O

terminals

Y1 terminal on AHC 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 AHC. Will control the indoor blower according

to the cooling mode blower speed

, ramping and adjust

selection jumper pins.

Yes

De−energize Y2 terminal on AHC.

Indoor blower speed will reset to Y1

demand. (Note: The outdoor unit control

directly controls the outdoor unit

operation.)

Still calling for 1

Stage?

De−energize Y1 (and O in cooling)

terminals on AHC (Note: The outdoor unit

control directly controls the outdoor unit

operation.)

Yes

Still calling for 2

stage?

De−energize indoor blower per ramping

profile.

Figure 38. Heat Pump Operation

Page 48

CBX40UHV

3. Cooling Operation

Air Handler Control AHC) 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

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

RECOMMEND - USE FIGURE 11 AS A REFERENCE

FOR SETTING JUMPER CONFIGURATIONS ON THE

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

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

AIR HANDLER CONTROL.

Room thermostat calls

for first

stage?

Air Handler Control (AHC) receives inputs on Y1 terminal.

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

IMPORTANT - USE CARE WHEN CUTTING LINKS TO

PREVENT DAMAGE TO CONTROL. SEE FIGURE 11,

CBX40UHV 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 AHC 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 AHC is configured as input and passes signal from room thermostat to outdoor unit.

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

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

Still calling for

second stage?

Yes

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

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

Still calling for first

stage?

Yes

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

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

De-energize indoor blower per ramping

profile.

CBX40UHV

Figure 39. Cooling Operation

Page 49

4. 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.



   

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.

AHC 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, AHC 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.

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

Figure 40. Error Code / Recall Mode

   

Page 50

CBX40UHV

5. Indoor Blower Test

Blower Test Mode

To enter Indoor Blower Test Mode, push and hold button next single character LED display until — (Solid bar), then release button.

(Solid bar) starts blinking on single character LED display.

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

Yes

AHC in Idle Mode

(No heating cooling or indoor fan

operation)



Turn room thermostat to OFF

Push and hold button until the solid A



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



CBX40UHV

Figure 41. Indoor Blower Test

Page 51

UNIT DIAGRAM

CBX40UHV - 208/230V SINGLE PHASE - SEQUENCE OF OPERATION

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

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

4. AHC energizes blower motor B3 on heating speed.

Page 52

CBX40UHV

ELECTRIC HEAT DIAGRAMS AND SEQUENCE OF OPERATIONS

ECB40-2.5, -4, -5 and ECB40-4CB, -5CB 208/230V Single-Phase - Sequence of Operation

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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.

CBX40UHV

Page 53

ECB40-6 and ECB40-6CB 208/230V Single-Phase Sequence of Operation

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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 54

CBX40UHV

ECB40‐8 and ECB40-8CB - 208/230V Single-Phase Sequence of Operation

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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)

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

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

CBX40UHV

Page 55

ECB40‐9CB - 208/230V Single-Phase Sequence of Operation

First-Stage Heat

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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)

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

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

Page 56

CBX40UHV

ECB40-12.5CB, ‐15CB - 208/230V Single-Phase Sequence of Operation

FIRST-STAGE HEAT

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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.

3. 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.

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

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

CBX40UHV

Page 57

ECB40‐20CB - 208/230V Single-Phase Sequence of Operation

First-Stage Heat

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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)

3. 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 AHC. The AHC outputs a 22VDC signal to the K34 and K35 relays.

4. 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.

Page 58

CBX40UHV

ECB40‐25CB - 208/230V Single-Phase Sequence of Operation

First-Stage Heat

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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)

3. When K34 closes, the unit is ready for a second stage heat demand. W2 of the thermostat provides a W2 demand to the AHC. The AHC outputs a 22VDC signal to the K33 and K35 relays. When K33-1 and K35-1 closes and as suming 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)

4. 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 AHC. The AHC outputs a 22VDC signal to the K36 relay. When K36-1 and K36-2 closes and a s s uming t h e N. C . primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE5 and HE6 are energized.

CBX40UHV

Page 59

G-ECB40-8, 10 and ECB40‐15CB - 208/230V Single-Phase Sequence of Operation

First-Stage Heat

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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 (remove jumper between W2 and R)

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

4. 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.

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CBX40UHV

ECB40‐20CB, ECB25CB - 208/230V Three-Phase Sequence of Operation

First-Stage Heat

1. W1 of the thermostat provides a W1 demand to the AHC. The AHC 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)

Third-Stage Heat (remove jumper between W3 and R, if using third stage)

CBX40UHV

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Lennox CBX40UHV, CBX40UHV-024, CBX40UHV-030 Installation And Service Procedure

Specifications and Main Features

Frequently Asked Questions

User Manual