CBX40UHV - HVACPartsShop.com

INSTALLATION AND SERVICE
PROCEDURE
Service Literature
CBX40UHV
Corp. 0906-L2
Revised October 2, 2013
CBX40UHV (HFC-410A) SERIES UNITS (iComfort-enabled)
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 . . . . 16
Variable Speed ECM Blower Motor . . . . . . . . . . . . . . . . 19
Optional ECB40 Electric Heat . . . . . . . . . . . . . . . . . . . . . 24
NOTICE
Optional Humidity Control . . . . . . . . . . . . . . . . . . . . . . . . 24
A thermostat is not included and must be ordered
separately.
Unit Sequence of Operations . . . . . . . . . . . . . . . . . . . . . 32
D The Lennox iComfort™ thermostat must be used in
communicating applications
(CBX40UHV-XXX-230-6-02 and later).
Application Configuration Modifications . . . . . . . . . . . . 37
Unit Status and Alarm Codes . . . . . . . . . . . . . . . . . . . . . 34
Start-Up Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
D In non-communicating applications, the Lennox
ComfortSense® 7000 thermostat may be used, as well
as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 40
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Configuring Unit Flow Charts . . . . . . . . . . . . . . . . . . . . . 42
Unit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Electric Heat Diagrams and Sequence of
Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
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 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® 7000
non-communicating thermostat and non-communicating
outdoor units. In addition, this unit has the enhance capability
of communicating with the iComfortt 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:
WARNING
The State of California has determined that this product
may contain or produce a chemical or chemicals, in very
low doses, which may cause serious illness or death. It
may also cause cancer, birth defects, or reproductive
harm.
Page 1
1.
Non-iComfort-enabled
230-6-01)
version
(CBX40UHV-XXX-
2.
iComfort-enabled version (CBX40UHV-XXX230-6-02) or later.
2013 Lennox Industries Inc.
MODEL NUMBER IDENTIFICATION
CB X 40 UHV − 036 − 230 − 6 − 02
Minor Revision Number
Unit Type
CB = Air Handler
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
Refrigerant Type
X = R-410A
Series
Configuration
UHV = Up-Flow/Horizontal, Variable
Speed Blower Motor
Nominal Cooling Capacity
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
CBX40UH CBX40UH CBX40UH CBX40UH CBX40UH CBX40UH
V
V
V
V
V
V
Model Number
‐024
‐030
‐036
‐042
‐048
‐060
2
Nominal cooling capacity - tons
Refrigerant HFC-410A
3/4
Connections
Suction (vapor) line - sweat
in.
3/8
Liquid line - sweat
(2) 3/4
Condensate drain (fpt)
5.0
Indoor
Net face area - ft.2
Coil
3/8
Tube outside diameter - in.
3
Number of rows
12
Fins per inch
11 X 8
Blower Data
Wheel nominal diameter x width - in.
1/2
Motor output - hp
1 Size - in. 20 X 20 X 5
Filters (MERV16)
165
Shipping Data - 1 Package - lbs.
2.5
HFC-410A
3/4
3/8
(2) 3/4
5.0
3/8
3
12
11 X 8
1/2
20 X 20 X 5
167
3
HFC-410A
3/4
3/8
(2) 3/4
5.0
3/8
3
12
11 X 8
3/4
20 X 20 X 5
172
3.5
HFC-410A
7/8
3/8
(2) 3/4
7.22
3/8
3
12
11-1/2 X 9
1
20 X 25 X 5
214
4
HFC-410A
7/8
3/8
(2) 3/4
7.22
3/8
3
12
11-1/2 X 9
1
20 X 25 X 5
216
5
HFC-410A
7/8
3/8
(2) 3/4
7.22
3/8
3
12
11-1/2 X 9
1
20 X 25 X 5
216
20
10
20
10
ELECTRICAL DATA
Voltage - phase - 60hz
2 Maximum overcurrent protection (unit only)
Minimum circuit ampacity (unit only)
1 Disposable frame type filter.
2 HACR type circuit breaker or
15
5
15
5
208/230V-1PH
15
20
10
10
fuse.
Page 2
CBX40UHV
BLOWER DATA
CBX40UHV­024 BLOWER PERFORMANCE
0 through 0.80 in. W.g. External Static Pressure Range
Jumper Speed Positions
“HEAT” Speed
“COOL” Speed
“AJUST”
Jumper Setting
1
2
3
4
1
2
3
4
+
cfm
715
cfm
855
cfm
1000
cfm
1130
cfm
465
cfm
690
cfm
900
cfm
1050
NORM
670
770
900
1035
425
620
825
950
-
580
700
800
930
385
560
735
850
NOTES:
S
S
S
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same second­stage COOL speed selected, minimum 250 cfm.
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)
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
AHC Jumper Speed
Positions
0
0.1
TAP 1
53
68
89
113
143
163
191
214
232
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
114
142
175
200
219
258
280
332
363
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
0.8
HEAT SPEED
COOL SPEED
0.8
CBX40UHV‐024 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (Adjust Jumper at NORM Setting)
AHC Jumper Speed
Positions
0
0.1
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
113
130
158
190
226
247
270
TAP 4
89
120
145
166
198
225
258
289
319
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
0.8
HEAT SPEED
COOL SPEED
CBX40UHV‐024 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (Adjust Jumper at “-” Setting)
AHC Jumper Speed
Positions
0
0.1
TAP 1
38
56
70
94
113
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
110
123
TAP 2
30
46
63
86
102
118
138
162
172
TAP 3
54
71
91
116
138
171
191
221
247
TAP 4
66
86
117
138
159
195
227
253
286
HEAT SPEED
COOL SPEED
CBX40UHV
Page 3
CBX40UHV­030 BLOWER PERFORMANCE
0 through 0.80 in. W.g. External Static Pressure Range
Jumper Speed Positions
“HEAT” Speed
“COOL” Speed
“AJUST”
Jumper Setting
1
2
3
4
1
2
3
4
+
cfm
800
cfm
935
cfm
1070
cfm
1210
cfm
660
cfm
880
cfm
1100
cfm
1320
NORM
725
850
975
1100
600
800
1000
1200
-
655
765
880
990
540
720
900
1080
NOTES:
S
S
S
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same second­stage COOL speed selected, minimum 250 cfm.
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)
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
AHC Jumper Speed
Positions
0
0.1
TAP 1
66
87
114
134
162
185
214
239
268
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
Motor Watts @ Various External Static Pressures - in. wg.
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
HEAT SPEED
COOL SPEED
0.8
CBX40UHV‐030 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (Adjust Jumper at NORM Setting)
AHC Jumper Speed
Positions
0
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
113
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
Motor Watts @ Various External Static Pressures - in. wg.
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
HEAT SPEED
COOL SPEED
CBX40UHV‐030 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (Adjust Jumper at “-” Setting)
AHC Jumper Speed
Positions
HEAT SPEED
COOL SPEED
0
TAP 1
48
66
83
107
127
149
171
199
217
TAP 2
TAP 3
63
80
103
125
145
178
200
229
246
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
113
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
Page 4
CBX40UHV
CBX40UHV­036 BLOWER PERFORMANCE
0 through 0.80 in. W.g. External Static Pressure Range
Jumper Speed Positions
“AJUST”
Jumper Setting
“HEAT” Speed
“COOL” Speed
1
2
3
4
1
2
3
4
cf
1335
m
1215
cfm
1445
cfm
1545
1400
cf
1225
m
1125
cfm
1545
1315
cf
900
m
810
cfm
1380
NORM
cf
1230
m
1120
1275
1400
-
1010
1185
1200
1265
730
1000
1135
1265
+
NOTES:
S
S
S
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same second­stage COOL speed selected, minimum 380 cfm.
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
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
0
0.1
TAP 1
189
223
253
271
306
323
359
377
0.8
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
Motor Watts @ Various External Static Pressures - in. wg.
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
CBX40UHV‐036 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (“Adjust” Jumper at NORM Setting)
AHC Jumper Speed
Positions
HEAT SPEED
COOL SPEED
0
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
Motor Watts @ Various External Static Pressures - in. wg.
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
CBX40UHV‐036 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (“Adjust” Jumper at “-” Setting)
AHC Jumper Speed
Positions
HEAT SPEED
COOL SPEED
CBX40UHV
0
TAP 1
110
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
Page 5
CBX40UHV­042 BLOWER PERFORMANCE
0 through 0.80 in. W.g. External Static Pressure Range
Jumper Speed Positions
“HEAT” Speed
“COOL” Speed
“AJUST”
Jumper Setting
1
2
3
4
1
2
3
4
+
cfm
1100
cfm
1320
cfm
1540
cfm
1760
cfm
1100
cfm
1320
cfm
1540
cfm
1760
NORM
1000
1200
1400
1600
1000
1200
1400
1600
-
900
1080
1260
1440
900
1080
1260
1440
NOTES:
S
S
S
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same second­stage COOL speed selected, minimum 450 cfm.
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
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
0
0.1
0.8
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
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
0.8
CBX40UHV‐042 BLOWER MOTOR WATTS AT “NORM” AHC SETTING (“Adjust” Jumper at NORM Setting)
AHC Jumper Speed
Positions
“HEAT” SPEED
COOL SPEED
0
0.1
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
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
0.8
CBX40UHV‐042 BLOWER MOTOR WATTS AT “-” (Minus) AHC SETTING (“Adjust” Jumper at “-” Setting)
AHC Jumper Speed
Positions
HEAT SPEED
COOL SPEED
0
0.1
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
Page 6
CBX40UHV
CBX40UHV­048 AND CBX40UHV-060 BLOWER PERFORMANCE
0 through 0.80 in. W.g. External Static Pressure Range
Jumper Speed Positions
“HEAT” Speed
“COOL” Speed
“AJUST”
Jumper Setting
1
2
3
4
1
2
3
4
+
cfm
1850
cfm
1960
cfm
2090
cfm
2150
cfm
1625
cfm
1820
cfm
2055
cfm
2145
NORM
1705
1800
1900
2005
1425
1625
1805
2005
-
1560
1625
1720
1770
1205
1375
1555
1725
NOTES:
S
S
S
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same second­stage COOL speed selected, minimum 450 cfm.
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
Motor Watts @ Various External Static Pressures - in. wg.
0.2
0.3
0.4
0.5
0.6
0.7
0
0.1
TAP 1
418
478
539
551
599
646
675
704
0.8
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
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
CBX40UHV
0
Motor Watts @ Various External Static Pressures - in. wg.
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
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
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
0
Motor Watts @ Various External Static Pressures - in. wg.
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
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
PARTS ARRANGEMENT
ELECTRIC HEAT
SECTION
CONTROL BOX
BLOWER
COMPARTMENT
BLOWER ACCESS
PANEL
HORIZONTAL
DRAIN PAN
COIL
COIL ACCESS
PANEL
UP-FLOW/DOWN-FLOW
DRAIN PAN
FILTER ACCESS
PANEL
FILTER
Figure 1. CBX40UHV Parts Arrangement
Page 8
CBX40UHV
HEATING ELEMENTS
LIMIT
LIMIT
RELAY
RELAY
CIRCUIT BREAKER
AIR HANDLER CONTROL
Figure 2. CBX40UHV Control Box
APPLICATION
UNIT COMPONENTS
CBX40UHV air handlers are designed for HFC-410A
applications only. All major air handler components
must
be matched according to Lennox
recommendations for the unit to be covered under
warranty. Refer to the Engineering Handbook for approved
system matchups. A misapplied system will cause erratic
operation and can result in early unit failure. The units come
with factory installed check and expansion valve for all
applications. It has been installed internally and is accessible if
required.
ELECTROSTATIC DISCHARGE (ESD)
PRECAUTIONS AND PROCEDURES
Application
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.
CBX40UHV
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
Page 9
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.
Air Handler Control (AHC)
208 / 240 VOLT TRANSFORMER
SECONDARY
BLUE
PRIMARY
ORANGE
240 VOLTS
RED
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.
Discharge Sensor (DAT)
208 VOLTS
YELLOW
BLACK
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.
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.
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
DETAIL A
THE AIR HANDLER CONTROL (AHC) HAS TWO
SCREW TERMINALS MARKED DISCHARGE AIR
SENSOR. THE SENSOR IS REQUIRED FOR
EVENHEATER® OPERATION, IS FIELD
MOUNTED AND MUST BE ORDERED
SEPARATELY (CATALOG # 88K38).
OPTIONAL DISCHARGE
SENSOR (DAT)
5-1/2 IN.
(140 MM)
ELECTRIC HEAT RELAY
PART NO. 49W91
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
SENSOR
(CENTER SIDE-T0 -SIDE)
19 IN.
(483 MM)
22V DIRECT CURRENT COIL
FASTEN THE PROBE
BRACKET TO THE
PLENUM WITH TWO
SELF-TAPPING SHEET
METAL SCREWS.
AIR HANDLER
CONTROL
30 AMP CONTACT
RATING
9-PIN
CONNECTOR
SECURING
SCREWS
AIR HANDLER CONTROL
L-BRACKET MOUNTING PLATE
CBX40UHV AIR HANDLER CONTROL
PART NO. 43W19
9-PIN CONNECTOR
DETAIL B
SEE TABLE 6 - STAGES
FOR FUNCTION OF
EACH PIN POSITION.
CONNECT WIRES TO DISCHARGE AIR SENSOR
TERMINAL ON AIR HANDLER CONTROL.
NOTE - EVENHEATER MODE CANNOT BE ENABLED WITH HARMONY III T
DUE TO EACH CONTROL REQUIRING ITS OWN DISCHARGE AIR SENSOR.
Figure 4. CBX40UHV-XXX-230-6-01
CBX40UHV
Page 11
PLENUM
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).
DISCHARGE SENSOR
(DAT)
5-1/2 IN.
(140 MM)
ELECTRIC HEAT RELAY
PART NO. 49W91
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
SENSOR
(CENTER SIDE-T0 -SIDE)
19 IN.
(483 MM)
22V DIRECT CURRENT COIL
FASTEN THE PROBE
BRACKET TO THE
PLENUM WITH TWO
SELF-TAPPING SHEET
METAL SCREWS.
PLENUM
AIR HANDLER
CONTROL
30 AMP CONTACT
RATING
9-PIN
CONNECTOR
SECURING
SCREWS
AIR HANDLER CONTROL
L-BRACKET MOUNTING PLATE
CBX40UHV AIR HANDLER CONTROL
PART NO. 50W28 or 65W70
9-PIN CONNECTOR
DETAIL B
SEE TABLE 6 - STAGES
FOR FUNCTION OF
EACH PIN POSITION.
CONNECT WIRES TO DISCHARGE AIR SENSOR
TERMINAL ON AIR HANDLER CONTROL.
NOTE — EVENHEAT MODE CANNOT BE ENABLED WITH HARMONY III DUE
TO EACH CONTROL REQUIRING ITS OWN DISCHARGE AIR SENSOR.
Figure 5. Component Connections (CBX40UHV-XXX-230-6-02)
Page 12
CBX40UHV
FIELD WIRING
CBX40UHV
COMFORTSENSET
7000
R
R
2
W3
AIR CONDITIONER
UNIT
(TWO-STAGE)
AIR HANDLER CONTROL COMES FROM FACTORY WITH A
METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3.
1
H
1
W2
W2
W1
W1
O
O
RED
2
R CONNECTION REQUIRED FOR AIR CONDITIONER UNIT WITH LSOM.
RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE
COMFORTSENSE 7000 WITH THE LSOM 2.
3
L CONNECTION WIRED ON UNITS WITH LSOM.
3
BROWN
IMPORTANT — USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 12,
CBX40UHV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
L
YELLOW
BLUE
Y1
Y2
Y2
G
G
DS
D
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE AC
DO NOT CUT ON-BOARD LINK R -O.
B
BLACK
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
C
C
Y1-Y2
2-STAGE
COMPR
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTION
Y1
AIR HANDLER
CONTROL
Figure 6. Field Wiring — Cooling Application (Non-Communicating)
CBX40UHV
HEAT PUMP UNIT
(TWO-STAGE)
COMFORTSENSET
7000
1
R
R
R
W3
H
W2
W2
2
W1
W1
O
O
3
1
W1
Y1
Y2
Y1
Y2
G
3
DS
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE HP
G
D
T
Y2
B
C
C
CUT ON-BOARD LINK R -O.
T
C
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
Figure 7. Field Wiring — Heat Pump (Non-Communicating)
CBX40UHV
Page 13
Y1-Y2
2-STAGE
COMPR
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTION
Y2
OUT
BL
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.
L
Y1
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT #
47W97) IS REQUIRED WHEN CONNECTING THE
COMFORTSENSE 7000 WITH THE LSOM 2.
O. D.
SENSOR
(X2658)
O
2
L
X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR
TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP AND
DUAL FUEL BALANCE POINTS.
OUTDOOR
SENSOR
(X2658)
IMPORTANT — USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 12,
CBX40UHV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
RED
T
RED
PUR
T
BLK
4
BLK
PUR
D
RESISTOR KIT (CAT # 47W97) IS REQUIRED
WHEN CONNECTING THE COMFORTSENSE
7000 WITH THE LSOM 2.
EDA UNIT
FAN
RELAY
YEL
BLU
BLK
BRN
CBX40UHV
COMFORTSENSEt
7000 THERMOSTAT
Y1-Y2
2-STAGE
COMPR
OUTDOOR UNIT
NOTES /1\ NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM
/2\ NOT REQUIRED WITH SINGLE‐SPEED OUTDOOR FAN
/3\ NOT REQUIRED FOR SINGLE STAGE
4
DO NOT CUT ON-BOARD LINK R -O.
AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL
JUMPERS BETWEEN W1 TO W2 AND W2 TO W3.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION
TERMINAL IS USED.
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTION
CUT ON-BOARD LINK Y1-Y2 FOR TWOSTAGE A/C
Figure 8. Cooling Application — Humiditrol ® and Second-Stage Outdoor Fan Relay Wiring
(Non-Communicating)
OUTDOOR UNIT
CBX40UHV
COMFORTSENSEt
7000 THERMOSTAT
RED
FAN RELAY (NOT REQUIRED
WITH SINGLE−SPEED
OUTDOOR FAN)
PURPLE
RED
OUTDOOR
SENSOR
BLACK
T
PURPLE
T
(X2658)
BLACK
YELLOW
BLUE
BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM
BLUE (NOT REQUIRED FOR SINGLE STAGE)
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C ONLY
CUT ON-BOARD LINK R -O.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION
TERMINAL IS USED.
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTION
IMPORTANT — USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 12,
CBX40UHV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
Y1-Y2
2-STAGE
COMPR
Figure 9. Heat Pump Application — Humiditrol ® and Second-Stage Outdoor Fan Relay Wiring
(Non-Communicating)
Page 14
CBX40UHV
Thermostat Connections
Table 2 (CBX40UHV-XXX-230-6-ALL)
Table 3. Air Handler Control Connections —
Communicating (CBX40UHV-XXX-230-6-ALL)
Label
Function
Used with a non-communicating thermostat to indicate a
W1 (Input) first-stage heating demand. This input is an anticipator
current for the thermostat.
Used with a non-communicating thermostat to indicate a
W2 (Input) second-stage heating demand. W1 input must be active
to recognize second-stage heat demand.
Used with a non-communicating thermostat to indicate a
third-stage heating demand.
W1 and W2 inputs must be active to recognize third-stage
W3 (Input)
heat demand. The stage 3
heat input provides thermostat load for the third-stage of
heat.
The first- and second-stage compressor contactor is con­
nected to the Y1 and Y2 terminals. They are inputs when
used with a non-communicating thermostat. A 24VAC
signal indicates the presence of a demand. This signal is
then passed through to the outdoor unit. During a secondstage demand, both Y1 and Y2 are active. In a commu­
Y1 & Y2
nicating system they are outputs to a non-communicat­
(Input /
ing outdoor unit. When a first- or second-stage com­
Output)
pressor demand is indicated by serial message from the
controller, a 24VAC signal is generated on Y1 and Y2.
These signals are hard-wired to the outdoor unit. During a
second-stage demand, both Y1 and Y2 are active. In a
communicating system with communicating outdoor
unit, Y1 and Y2 terminals are not used.
It is used with a non-communicating thermostat to indicate
a indoor blower demand. A 24VAC signal indicates the
G (Input) presence of a demand. In communicating system G input
is used by non-communicating IAQ devices (such as
LVCS, HRV or ERV) to indicate indoor blower demand.
This terminal shall interconnect the signal ground of the
thermostat with secondary transformer ground (TR) and
C
chassis ground (GND).
This terminal is capable of providing the power to the ther­
R
mostat and all the associated loads.
The O terminal is used with heat pump units to power the
reversing valve. The O terminal is connected to R by
jumper wire that would be cut if a heat pump was used. It
is used with a non-communicating thermostat as input to
set the heat pump to cooling or heating mode. A 24VAC
O (Input / signal sets the heat pump to cooling mode; an open circuit
Output)
sets the heat pump to heating mode. This signal is passed
through to the heat pump. In a communicating system O
is an output to a non-communicating heat pump. The air
handler controls the output based on received RSbus
messages. A 24VAC signal is generated on O for cooling
operation, while terminal is open for heat pump operation.
This terminal is used in non-communicating systems with
DS (Input) Harmony zoning systems, or thermostats with de-humidi­
fication capability.
This terminal provides a 24VAC output for dehumidifica­
DH (Output)
tion needs in communicating systems.
This terminal provides a 24VAC output for humidification
H (Output) needs in both communicating and non-communicating
mode.
This terminal is provided for connection to devices with
Lennox System Operation Monitor (LSOM) capabilities.
The control interprets the fault signals and transmits them
L (Input)
as an alarm message on RSbus. There are ten (10) identi­
fied LSOM fault codes. Each is mapped to an RSbus
Alarm code.
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.
CBX40UHV
Page 15
Label
Thermostat
Outdoor Unit
Link
Label
R
i+
iC
R
i+
iC
i+
i-
Function
24VAC
RSbus data high connection
RSbus data low connection
24VAC command (ground)
24VAC
RSbus data high connection
RSbus data low connection
24VAC command (ground)
Not used.
Thermostat Wire Length
Table 4. Run Length — Communicating
(CBX40UHV-XXX-230-6-02)
Wire Run Length
AWG #
Insulation/Core Types
Maximum length of wiring
for all connections on the
RSBus is limited to 1500
feet (457 meters).
18
Color-coded, temperature
rating 95ºF (35ºC) minimum,
solid core. (Class II Rated
Wiring)
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 95ºF (35ºC) minimum,
solid core. (Class II Rated
Wiring)
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
Function / Description
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
AIR HANDLER CONTROL BUTTON, DISPLAY AND
JUMPERS
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.
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
Heating — Heat Pump only:
C
OFF A
OFF A
Delay Profile 3
OFF
COOL­
ING
DEMAND
C. Once demand is met, motor ramps down to stop
Delay Profile 4
B
OFF
C
7 1/2 MIN
82% CFM
A
100%
CFM
D E
OFF
1/2 MIN
50% CFM
COOLING DEMAND
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
C
100% CFM
OFF
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.
1/2 MIN
50% CFM
B
100% CFM
100% CFM
A. When cool demand is initiated, motor ramps up to
82%
Delay Profile 2
A
7 1/2 MIN
82%CFM
A
COOLING DEMAND
Cooling — Air Conditioner and Heat Pump:
OFF
C
B
OFF
100
%CF
M
COOLING
DEMAND
OFF
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.
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).
B
100% CFM
HEATING DEMAND
Delay Profile 1
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.
B
30 sec
delay
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).
S
D
100% CFM
OFF
45 SEC.
Page 16
CBX40UHV
12 3
4
7−SEGMENT
LED DISPLAY
LOW
SPEED
HEAT
COOL
1
24 VAC
3
4
J5
J8
SMART
−
L
H
85
BLOWER
ONLY CFM
1
2
3
4
STANDARD HEAT MODE
(DEFAULT)
4
C
9
7
STANDARD
HEAT MODE
(STAGED BY TSTAT)
85
110
115
130
1
6
Y2
3
Y1
R
NORM +
J11
DH
ADJUST
115
4
100
3
130
J10
2
LINE
OUTDOOR
DISCHARGE
SENSOR
AIR SENSOR
FACTORY
JUMPER
FUTURE
USE
CONTINUOUS FAN
MODE BLOWER SPEED
* NORMAL
NORM+
−
−
(−10%)
SETTING
NORM+
HIGH
SPEED
(100%)
12 3
4
DELAY
PROFILE #3
OFF−82%−100%−OFF
(+ 10%)
SETTING
NORM+
* DELAY
PROFILE #4
OFF−50%−82%−
100%−50%−OFF
−
DELAY
PROFILE #2
12 3
4
MEDIUM−HIGH
SPEED
(70%)
12 3
4
12 3
4
CLG
OFF−100%−100%−OFF
HP
12 3
OFF−30sOFF−100%−100% OFF
4
* 85
DEGREE TARGET
DISCHARGE
TEMPERATURE
12 3
4
115
DEGREE
TARGET
130
DEGREE
TARGET
* MEDIUM−LOW
SPEED
(38%)
12 3
4
12 3
4
Figure 11. CBX40UHV-XXX-230-6-01
CBX40UHV
R−0
100
DEGREE
TARGET
LOW
SPEED
(28%)
DELAY
PROFILE #1
OFF−100%−OFF
Y1−Y2
2 STAGE
COMPR
−ENABLED WITH OPTIONAL
DISCHARGE AIR SENSOR
85
110
115
130
(COOLING MODE UNLESS NOTED)
SMART
AUTO
AUTO MODE
− ”H” ENABLED WHEN
BLOWER ACTIVE
& NO CLG
SMART
AUTO
OR DEHUM
85
110
115
130
COOLING MODE
BLOWER RAMPING
* SMART MODE
− ”H” ENABLED WHEN
HEAT ACTIVE
(HP or ELECT. HT)
85
110
115
130
BLOWER
ADJUST SELECTION
 MODE
EVENHEATER
HUMIDIFICATION MODE
24VAC OUTPUT ON ”H”
FOR HUMIDIFIER OR
ACCESSORY INTERLOCK
85
110
115
130
W1 W2
W3
G
XFM
HEAT
PUMP
R−0
HUMIDIFICATION MODE
J4
1
1
CUT LINK
IMPORTANT: USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL.
AUTO
EVENHEAT
HARMONY ZONING
OR
C0MFORTSENSE 7000
W/ DS CONNECTION
−CUT ON−BOARD LINK (SOLDER TRACE)
COMPLETELY
1 THROUGH BOTH LAYERS ON THE CONTROL BOARD
HUMIDIFICATION
DELAY
J9
COM
2
DO NOT CUT
DS
XFMR 24V
OR NO
COMFORTSENSE 7000
W/ DS CONNECTION
CUT FOR OPTION
4
1
* NO HARMONY ZONING
O
3
PUMP
2
DEHUMOR
1
R−DS
J7
2−STAGE
3 AMP
3
Y1−Y2
FUSE
F1
PUSH
BUTTON
12 3
4
HEAT
12 3
4
R−O
LOW
SPEED
COMPR
12 3
4
Y1−Y2
2 STAGE
COMPR
2−STAGE
MEDIUM−LOW
SPEED
1
HEAT PUMP UNIT
R−DS
MEDIUM−LOW
SPEED
CUT LINK
DEHUM
or
HARMONY
1
12 3
4
DEHUMIDIFICATION−
HARMONY LINK
(JUMPERS R to DS)
12 3
4
2−STG COMPRESSOR
CUT LINK
R−DS
MEDIUM−HIGH
SPEED
SPEED
* A/C UNIT
DO NOT CUT
HARMONY
* MEDIUM−HIGH
DO NOT CUT
DEHUM
or
HARMONY
12 3
4
*1−STG COMPRESSOR
HEAT
PUMP
SPEED
12 3
4
(JUMPERS Y1 to Y2)
* HIGH
(JUMPERS R to O)
(ELECTRIC HT MODE)
HIGH
SPEED
COMPRESSOR LINK
(COOLING & HP MODE)
ON−BOARD LINK
HEATING MODE
BLOWER SPEED
OPTION SELECTION
COOLING MODE
BLOWER SPEED
HEAT PUMP LINK
CBX40UHV JUMPER & LINK GUIDE
Page 17
* FACTORY DEFAULT SETTING
MEDIUM-HIGH
SPEED
1
12 34
12 34
LOW
SPEED
LOW
SPEED
XFMR24V
DH
C
HUMIDIFICATION
COOL
24 VAC
1 2 3 4
COM
1
EVENHEAT
85
1 2 3 4
O
STANDARD HEAT MODE
(DEFAULT)
L
H
-
1 2 3 4
DH
R
STANDARD
HEAT MODE
Y1
L1
Y2
(STAGED BY TSTAT)
G
INDOOR
G L2 L1 BLOWER
POWER
W3
W2
EARTH
EVENHEATER MODE
NORM + (-10%)
SETTING
NORM + -
CONTINUOUS FAN
BLOWER SPEED
OFF-50%-82%100%-50%-OFF
12 34
DELAY PROFILE #2
CLG
OFF ­ 100% ­ DEMAND
SATISFIED ­ 100% FOR 45
SECONDS ­ OFF
12 34
HP
OFF ­ 30 SECOND DELAY ­
100% ­ DEMAND
SATISFIED ­ 100% FOR 45
SECOND ­ OFF
12 34
* MEDIUM-LOW
SPEED
(38%)
12 34
LOW
SPEED
(28%)
DELAYPROFILE #1
OFF-100%-OFF
MEDIUM-HIGH
SPEED
(70%)
12 34
12 34
100
DEGREE
TARGET
85
110
115
130
HIGH
SPEED
(100%)
DELAY PROFILE #3
* 85
DEGREE TARGET
DISCHARGE
TEMPERATURE
85
110
115
130
OUTDOOR DISCHARGE
AIR SENSORAIR SENSOR
(COOLING MODE UNLESS NOTED)
OFF-82%-100%-OFF
(+ 10%)
SETTING
AUTO
12 34
115
DEGREE
TARGET
85
110
115
130
COOLING BLOWER RAMPING
*DELAY PROFILE #4
NORM + -
AUTO MODE
- ”H” ENABLED WHEN
BLOWER ACTIVE
SMART
& NO CLG
OR DEHUM
130
DEGREE
TARGET
85
110
115
130
R I+ I- C
OUTDOOR UNIT R I + I - C
THERMOSTAT
FACTORY
JUMPER
7-SEGMENT LED
NORMAL
* SMART MODE
- ”H” ENABLED WHEN
HEAT ACTIVE
SMART
AUTO
(HP or ELECT. HT)
-ENABLED WITH OPTIONAL
DISCHARGE AIR SENSOR
I+ ILINK
*
HUMIDIFICATION MODE
24VAC OUTPUT ON ”H”
FOR HUMIDIFIER OR
ACCESSORY INTERLOCK
W1
INDOOR BLOWER
SIGNAL
4 5 6
1 2 3
BLOWER
ADJUST SELECTION
85
110
115
130
C
XFMR LINE
L2
Y1-Y2
2 STAGE
COMPR
Y1-Y2
2 STAGE
COMPR
THROUGH BOTH LAYERS ON THE CONTROL BOARD
IMPORTANT: USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL.
HUMIDIFICATION MODE
DS
BLOWER
ONLY CFM
ADJUST
NORM +
1
CUT LINK
-CUT ON-BOARD LINK (SOLDER TRACE) COMPLETELY
SMARTAUTO
DELAY
3 2 1 P8
6 5 4
9 8 7
R-O
HEAT
PUMP
R-DS
OR
DEHUM
HARMONY
HUMIDITROL
Y1-Y2
2-STAGE
COMPR
HEAT
1 2 3 4
DO NOT CUT
BUTTON
130
FUSE 3 AMP
HARMONY ZONING
OR
C0MFORTSENSE 7000
W/ DS CONNECTION
PUSH
12 34
100
115
12 34
1
* NO HARMONY ZONING
OR NO
COMFORTSENSE 7000
W/ DS CONNECTION
(JUMPERS R to DS)
MEDIUM-LOW
SPEED
HARMONY LINK
DEHUMIDIFICATION-
MEDIUM-LOW
SPEED
HEAT PUMP UNIT
CUT LINK
DO NOT CUT
12 34
12 34
1
R-DS
DEHUM
or
HARMONY
* MEDIUM-HIGH
SPEED
* A/C UNIT
CUT LINK
R-0
HEAT
PUMP
12 34
2-STG COMPRESSOR
R-DS
DEHUM
or
HARMONY
12 34
DO NOT CUT
R-0
HEAT
PUMP
* HIGH
SPEED
(JUMPERS Y1 to Y2)
ON-BOARD LINK
(ELECTRIC HT MODE)
HIGH
SPEED
OPTION SELECTION
(COOLING & HP MODE)
(JUMPERS R to O)
2-STAGE
HEATING MODE
BLOWER SPEED
COMPRESSOR LINK
COOLING MODE
BLOWER SPEED
HEAT PUMP LINK
JUMPER & LINK GUIDE
* 1-STG COMPRESSOR
* INDICATES FACTORY DEFAULT SETTING
12 34
Figure 12. Air Handler Configuration (CBX40UHV-XXX-230-6-02 or higher)
Page 18
CBX40UHV
VARIABLE SPEED ECM BLOWER MOTOR
All CBX40UHV blower motors use single phase power.
An external run capacitor is not used. The motor uses
permanently lubricated ball‐type bearings.
STATOR
(WINDINGS)
BEARING
CONTROLLER
OUTPUT
SHAFT
ROTOR
Figure 14. Blower Motor Components
Blower Motor (B3)
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.
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 controller
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.
CBX40UHV
Page 19
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.
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
P48 5 PIN
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.
P49 4 PIN
MOTOR with INTEGRATED
CONTROLLER
Indoor Blower Motor (B3) Control Troubleshooting
(Regal-Beloit)
J48 5 Pin
To verify motor operation see steps below and figure 15.
J49 4 Pin
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.
J48 5 Pin Line Voltage Connector
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
J49 4 Pin Control Connector
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.
Figure 15. Regal-Beloit — Blower B3 Harness
Connectors
3. Motor should run at 75%.
Page 20
CBX40UHV
P48 5 PIN
Indoor Blower Motor (B3) Control
Troubleshooting (Emerson)
P49 4 PIN
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.
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.
P48 5 Pin
P49 4 Pin
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.
1
2
3
4
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).
J48 Connector
5
120v
0
230v
J48 Connector
installed on motor
P49 4 Pin
24v Transformer
Scale
Measurement range in
words
ohms
2M
two megohm-two million
ohms
0 - 2,000,000
200 K
two hundred kilo-ohm-two
hundred thousand ohms
0 - 200,000
20 K
twenty kilo-ohm-twenty
thousand ohms
0 - 20,000
2K
two kilo-ohm two-thousand
ohms
0 - 2,000
200
two hundred ohms
0 - 200
J49 Connector
Figure 16. Regal-Beloit — Troubleshooting
Figure 17. Typical Digital Multimeter
CBX40UHV
Page 21
B. If there is no damage, proceed to next step.
CONTROL MODULE
3-PIN JACK
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
NTC
THERMISTOR
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.
Figure 19. Motor Test (Emerson)
P48 (5-PIN)
P49 (4-PIN)
MOTOR
CONTROL MODULE
J48 5 Pin Line Voltage Connector
P48 5 Pin
P49 4 Pin
J49 4 Pin Control Connector
Figure 20. Indoor Blower Motor (B3) Control Connections (Emerson)
Page 22
CBX40UHV
P48 (5-PIN)
HARNESS
P49 (4-PIN) HARNESS
P48 (5-PIN)
HARNESS
MOTOR
P49 4 Pin
CONTROL MODULE
1
120v
2
3
4
5
J48 Connector
230v
0
Figure 21. J48 Test (Emerson)
P48 (5-PIN)
HARNESS
P49 (4-PIN) HARNESS
P48 (5-PIN)
HARNESS
MOTOR
CONTROL MODULE
J49 4 Pin
J49 Connector
24v Transformer
Figure 22. J49 Test (Emerson)
CBX40UHV
Page 23
3. Terminal Strip (TB2)
OPTIONAL ECB40 ELECTRIC HEAT
Match-ups and Ratings
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.
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.
Limit
TABLE 7
Open°
Close°
S15
150_F + 5
110 + 9
S20
333_F + 10_F
Replace limit
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 wire
frame. For single phase applications, one element is
used per stage. Each stage is energized
independently by the corresponding relay located
on the electric heat vestibule arranged in a three
phase delta. Once energized, heat transfer is
instantaneous. High temperature protection is
provided by primary and secondary high
temperature limits.
2. Electric Heat Relays (K32, K33, K34, K35 and K36)
Relays K32, K33, K34, K35 and K36 are N.O. relays
located on the electric heat vestibule panel and are
energized by a 24V heating demand (W1, W2, and W3)
via jack/plug 2 (J2), which is used to connect electric heat
to the blower coil control circuit. The relays energize
different stages of heat, as well as the blower. The
blower is always first on and last off.
Page 24
CBX40UHV
ECB40-9CB P VOLTAGE SHOWN
Elements HE1 and HE2
Primary Limit S15 and
Secondary Limit S20
Relay K33
Location of CB1
Relay K32
Figure 23. Electric Heat
CBX40UHV
Page 25
ELECTRIC HEAT DATA - CBX40UHV-024 AND CBX40UHV-030
SINGLE PHASE ELECTRIC HEAT
CBX40UHV-024
CBX40UHV-030
3 Minimum
Model Number
2.5 kW
4 lbs.
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.
ECB40-2.5 (34W86)
Terminal Block
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
ECB40-12.5CB (34W94)
(1) 30A & (1) 45A Circuit
breaker
ECB40-15CB (34W95)
(1) 35A & (1) 60A Circuit
breaker
No.
of
Stages
1
1
1
1
1
2
2
2
Volts
Input
kW
Input
1 Btuh
Input
2 Blower
Motor
Full Load
Amps
3 Minimum
Circuit
Ampacity
5 Maximum
Overcurrent
Protection
Circuit
Ampacity
Circuit
5 Maximum
Overcurrent
Protection
Circuit
1
2
1
2
208
1.9
6,400
4.0
17
20
---
---
---
---
220
2.1
7,200
4.0
17
20
---
---
---
---
230
2.3
7,800
4.0
18
20
---
---
---
---
240
2.5
8,500
4.0
18
20
---
---
---
---
208
3.0
10,250
4.0
23
4 25
23
---
4 25
---
220
3.4
11,450
4.0
24
4 25
24
---
4 25
-----
230
3.7
12,550
4.0
25
4 25
25
---
4 25
240
4.0
13,650
4.0
26
30
26
---
30
---
208
3.8
12,800
4.0
28
4 30
28
---
4 30
---
220
4.2
14,300
4.0
29
4 30
29
---
4 30
---
230
4.6
15,700
4.0
30
4 30
30
---
4 30
---
240
5.0
17,100
4.0
31
35
31
---
35
---
208
4.5
15,400
4.0
32
4 35
32
---
4 35
---
220
5.0
17,100
4.0
33
4 35
33
---
4 35
-----
230
5.5
18,800
4.0
35
4 35
35
---
4 35
240
6.0
20,500
4.0
37
40
37
---
40
---
208
6.0
20,500
4.0
41
4 45
41
---
4 45
---
220
6.7
22,900
4.0
43
4 45
43
---
4 45
---
230
7.3
25,100
4.0
45
4 45
45
---
4 45
---
240
8.0
27,300
4.0
47
50
47
---
50
---
208
6.8
23,100
4.0
46
4 50
46
---
4 50
---
220
7.6
25,800
4.0
48
4 50
48
---
4 50
---
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
4 25
4 40
220
10.5
35,800
4.0
---
---
25
40
4 25
4 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
4 30
4 45
220
12.6
43,000
4.0
---
---
29
48
4 30
4 50
4 50
60
230
13.8
47,000
4.0
---
---
30
50
4 30
240
15.0
51,200
4.0
---
---
31
52
35
NOTE - Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.
1 Electric heater capacity only - does not include additional blower motor heat capacity.
2 Amps shown are for blower motor only.
3 Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167F.
4 Bold text indicates that the circuit breaker on “CB” circuit breaker models must be replaced with size noted. See Table on Page 6.
5 HACR type circuit breaker or fuse.
Page 26
CBX40UHV
ELECTRIC HEAT DATA - CBX40UHV-036
SINGLE PHASE ELECTRIC HEAT
CBX40UHV-036
3 Minimum
Model Number
4 kW
4 lbs.
5 kW
4 lbs.
6 kW
4 lbs.
8 kW
5 lbs.
9 kW
5 lbs.
12.5
kW
10 lbs.
15 kW
12 lbs.
20 kW
19 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
ECB40-20CB (34W96)
(2) 60A Circuit breaker
No.
of
Stages
1
1
1
1
2
2
2
2
Volts
Input
kW
Input
1 Btuh
Input
5 Maximum
Overcurrent
Protection
Circuit
Ampacity
2 Blower
Motor Full
Load Amps
Circuit
Circuit
1
2
1
2
208
3.0
10,250
5.6
25
---
4
25
---
220
3.4
11,450
5.6
26
---
4
30
---
230
3.7
12,550
5.6
27
---
4
30
---
240
4.0
13,650
5.6
28
---
4
30
---
208
3.8
12,800
5.6
30
---
4
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
---
4
35
---
220
5.0
17,100
5.6
35
---
4
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
---
4
45
---
220
6.7
22,900
5.6
45
---
4
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
---
4
50
---
220
7.6
25,800
5.6
50
---
4
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
4
40
220
10.5
35,800
5.6
27
40
30
4
40
230
11.5
39,200
5.6
28
42
30
240
12.5
42,600
5.6
29
44
30
208
11.3
38,400
5.6
30
45
220
12.6
43,000
5.6
31
48
230
13.8
47,000
5.6
32
240
15.0
51,200
5.6
208
15.0
51,200
220
16.8
57,300
230
18.4
240
20.0
208
220
4
---
45
45
4
45
35
4
50
50
35
4
50
33
52
35
5.6
48
50
4
50
5.6
50
53
4
50
62,700
5.6
52
55
60
60
68,200
5.6
54
57
60
60
6.0
20,500
5.6
28
---
30
---
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
---
30
60
4
50
60
THREE PHASE ELECTRIC HEAT
8 kW
5 lbs.
10 kW
6 lbs.
15 kW
12 lbs.
CBX40UHV
ECB40-8 (34W98)
Terminal Block
ECB40-10 (34W99)
Terminal Block
ECB40-15CB (35W00)
50A Circuit breaker
1
1
1
Page 27
4
60
---
ELECTRIC HEAT DATA - CBX40UHV-036 (Continued)
THREE PHASE ELECTRIC HEAT
CBX40UHV-036
No.
of
Stages
Model Number
20 kW
19 lbs.
ECB40-20CB (35W01)
(2) 35A Circuit breaker
2
2 Blower
3 Minimum
Circuit
Ampacity
5 Maximum
Overcurrent
Protection
Volts
Input
kW
Input
1 Btuh
Input
Motor Full
Load Amps
208
15.0
51,200
5.6
33
26
35
4
30
220
16.8
57,300
5.6
35
28
35
4
30
230
18.4
62,700
5.6
36
29
4
40
4
30
240
20.0
68,200
5.6
37
30
4
40
35
NOTE - Circuit 1 Minimum Circuit Ampacity includes the Blower Motor Full Load Amps.
1 Electric heater capacity only - does not include additional blower motor heat capacity.
2 Amps shown are for blower motor only.
3 Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167F.
4 Bold text indicates that the circuit breaker on “CB” circuit breaker models must be replaced with size noted. See Table on Page 6.
5 HACR type circuit breaker or fuse.
ELECTRIC HEAT DATA - CBX40UHV-042, CBX40UHV-048, AND CBX40UHV-060
SINGLE PHASE ELECTRIC HEAT
Model Number
CBX40UHV-042, CBX40UHV-048 and CBX40UHV-060
3 Minimum
Circuit Ampacity
2 Blower
5 Maximum
Overcurrent Protection
No. of
Stages
Volts
Input
kW
Input
1 Btuh
Input
Motor Full
Load
Amps
Circuit
1
Circuit
2
Circuit
3
Circuit
1
Circuit
2
Circuit
3
4 kW
4 lbs.
ECB40-4 (55W89)
Terminal Block
ECB40-4CB (55W90)
35A Circuit breaker
1
208
3.0
10,250
7.4
27
---
---
4 30
---
---
5 kW
4 lbs.
ECB40-5 (34W87)
Terminal Block
ECB40-5CB (34W90)
35A Circuit breaker
1
208
3.8
12,800
7.4
32
---
---
35
---
---
6 kW
4 lbs.
ECB40-6 (34W88)
Terminal Block
ECB40-6CB (34W91)
40A Circuit breaker
1
208
4.5
15,400
7.4
37
---
---
40
---
---
8 kW
5 lbs.
ECB40-8 (34W89)
Terminal Block
ECB40-8CB (34W92)
50A Circuit breaker
1
208
6.0
20,500
7.4
46
---
---
50
---
---
9 kW
5 lbs.
ECB40-9CB (34W93)
60A Circuit breaker
2
208
6.8
23,100
7.4
51
---
---
60
---
---
ECB40-12.5CB (34W94)
12.5 kW
(1) 30A & (1) 45A Circuit
10 lbs.
breaker
2
208
9.4
32,000
7.4
29
38
---
30
4 40
---
15 kW
12 lbs.
ECB40-15CB (34W95)
(1) 35A & (1) 60A Circuit
breaker
2
208
11.3
38,400
7.4
32
45
---
35
4 45
---
20 kW
19 lbs.
ECB40-20CB (34W96)
(2) 60A Circuit breaker
2
208
15.0
51,200
7.4
50
50
---
4 50
4 50
---
25 kW
19 lbs.
ECB40-25CB (34W97)
(1) 60A & (2) 45A Circuit
breaker
3
208
18.8
64,100
7.4
47
38
38
4 50
4 40
4 40
Page 28
CBX40UHV
ELECTRIC HEAT DATA - CBX40UHV-042, CBX40UHV-048, AND CBX40UHV-060 (Continued)
SINGLE PHASE ELECTRIC HEAT
CBX40UHV-042, CBX40UHV-048 and CBX40UHV-060
3 Minimum
Circuit Ampacity
2 Blower
No. of
Stages
Model Number
5 Maximum
Overcurrent Protection
Volts
Input
kW
Input
1 Btuh
Input
Motor Full
Load
Amps
Circuit
1
Circuit
2
Circuit
3
Circuit
1
Circuit
2
Circuit
3
208
6.0
20,500
7.4
30
---
---
35
---
---
220
6.7
22,900
7.4
31
---
---
35
---
---
230
7.3
25,100
7.4
32
---
---
35
---
---
240
8.0
27,300
7.4
33
---
---
35
---
---
208
7.5
25,600
7.4
36
---
---
40
---
---
220
8.4
28,700
7.4
37
---
---
40
---
---
230
9.2
31,400
7.4
38
---
---
40
---
---
240
10.0
34,100
7.4
40
---
---
40
---
---
208
11.3
38,400
7.4
49
---
---
50
---
---
220
12.6
43,000
7.4
51
---
---
4
60
---
---
60
THREE PHASE ELECTRIC HEAT
8 kW
5 lbs.
ECB40-8 (34W98)
Terminal block
10 kW
6 lbs.
15 kW
12 lbs.
20 kW
19 lbs.
25 kW
19 lbs.
ECB40-10 (34W99)
Terminal block
ECB40-15CB (35W00)
50A Circuit breaker
ECB40-20CB (35W01)
(2) 35A Circuit breaker
ECB40-25CB (35W02)
(1) 50A & (1) 40A Circuit
breaker
1
1
1
2
2
230
13.5
47,000
7.4
52
---
---
4
---
---
240
15.0
51,200
7.4
55
---
---
4
60
---
---
208
15.0
51,200
7.4
36
26
---
4 40
4 30
---
4 30
---
220
16.8
57,300
7.4
37
28
---
4 40
230
18.4
62,700
7.4
38
29
---
4 40
4 30
---
240
20.0
68,200
7.4
40
30
---
4 40
35
---
4 35
---
208
18.8
64,100
7.4
42
33
---
4 45
220
21.0
71,700
7.4
44
34
---
4 45
4 35
---
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.
1 Electric heater capacity only - does not include additional blower motor heat capacity.
2 Amps shown are for blower motor only.
3 Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements. Use wires suitable for at least 167F.
4 Bold text indicates that the circuit breaker on “CB” circuit breaker models must be replaced with size noted. See Table on Page 6.
5 HACR type circuit breaker or fuse.
OPTIONAL HUMIDITY CONTROL (A20)
Principles of cooling with drier air
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.
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
COOLING
TUE OCT 23 1:15PM
CBX40UHV
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.
Page 29
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
Outdoor Unit Compressor
type
type
Jumpers
required
OFF
Heat Pump
one-stage
DS to Y1 &
Y1 to Y2
two-stage
DS to Y1
one-stage
DS to Y1 &
Y1 to Y2 &
O to R
two-stage
DS to Y1 &
O to R
one-stage
Y1 to Y2
two-stage
None
one-stage
Y1 to Y2 &
O to R
Condensing
Unit
ON
Heat Pump
Condensing
Unit
two-stage
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® mode
Select this mode when Humiditrol® 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
Operation
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
|
|
Default setting is 50% RH. Use up/down arrows to change
the %RH; press SAVE.
DEHUM SETPOINT
DEFAULT (5O%)
45%
|
Page 30
CBX40UHV
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 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
|
|
|
2- Scroll to HUMIDITY OFFSET; press ENTER. Use
arrows to select a new offset. Press SAVE.
3- Use up/down arrows to change the humidity setpoint
(between 15 and 45%); press SAVE.
HUM SETPOINT
DEFAULT (45%)
HUMIDITY OFFSET
DEFAULT(O%)
2%
45%
4O%
|
|
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 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.
User Control of Humidification
1- From the OPTIONS screen, scroll to USER SETTINGS
and press ENTER.
CBX40UHV
Page 31
DEHUM SETPOINT
5O%
DEFAULT (5O%)
45%
|
UNIT SEQUENCE OF OPERATIONS
Table 9. CBX40UV with ComfortSense® 7000 Thermostat and Single-Stage Outdoor Unit Operating Sequence
Operating Sequence
System
Condition
System Demand
Thermostat Demand
System Response
Y1
Y2
O
G
W1
Comp
Air
Handler
CFM
(COOL)
Comments
High
100%
Compressor and indoor
air
handler
follow
thermostat demand
Relative Humidity
Step
W2
Status
D
NO CALL FOR DEHUMIDIFICATION
Normal
Operation
1
On
On
On
Acceptable
24 VAC
BASIC MODE (Only active on a Y1 thermostat demand)
Normal
Operation
1
On
On
On
Acceptable
24 VAC
High
100%
Dehumidification
Call
2
On
On
On
Demand
0 VAC
High
70%
ComfortSense 7000 ther­
mostat energizes Y1 and
de-energizes D on a call
for dehumidification.
Note: No over cooling.
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal
Operation
1
On
On
On
Acceptable
24 VAC
High
100%
Dehumidification
call
2
On
On
On
Demand
0 VAC
High
70%
Dehumidification
call ONLY
1
On
On
On
Demand
Page 32
0 VAC
High
70%
Dehumidification mode
begins when humidity is
greater than set point
ComfortSense 7000 will
keep
outdoor
unit
energized after cooling
temperature setpoint has
been reach in order to
maintain room humidity
setpoint.
Note: Allow to over cool
2 0F from cooling set
point.
CBX40UHV
Table 10. CBX40UV, with ComfortSense® 7000 Thermostat and Two‐Stage Outdoor Unit Operating Sequence
Operating Sequence
System Demand
System Response
Thermostat Demand
System
Condition
Step
Y1
Y2
O
G
Compre
ssor
Air
Handler
CFM
(COOL)
Relative Humidity
W1
W2
Status
D
Comments
No Call for Dehumidification
Normal Operation
- Y1
1
On
Normal Operation
- Y2
2
On
On
On
On
Acceptable
24 VAC
Low
70%
On
On
Acceptable
24 VAC
High
100%
Compressor and indoor air
handler follow thermostat
demand
Room Thermostat Calls for First-Stage Cooling
BASIC MODE (Only active on a Y1 thermostat demand)
Normal Operation
1
On
Dehumidification
Call
2
On
On
On
On
Acceptable
24 VAC
Low
70%
On
On
Demand
0 VAC
High
70%
ComfortSense 7000 thermo­
stat energizes Y2 and de-en­
ergizes D on a call for
dehumidification
Note: No over cooling.
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal Operation
1
On
Dehumidification
call
2
On
Dehumidification
call ONLY
1
On
On
On
On
On
Acceptable
24 VAC
Low
70%
On
On
Demand
0 VAC
High
70%
On
On
Demand
0 VAC
High
70%
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 0F
from cooling set point.
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%
ComfortSense 7000 thermo­
stat energizes Y2 and de-en­
ergizes D on a call for
dehumidification
Note: No over cooling.
PRECISION MODE (Operates independent of 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%
Dehumidification
call ONLY
CBX40UHV
1
On
On
On
On
Demand
Page 33
0 VAC
High
70%
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 0F
from cooling set point.
UNIT STATUS AND ALARM CODES
Table 11. AHC System Status Codes
AHC Single Character
Display
Action
Letter or Number
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 Stage heat pump (shows active heat pump stages)
Discharge air sensor temperature (indoor blower must be operating)
or Table 12. AHC Configuration, Test and Error Recall (Fault and Lockout) Function
NOTE — AHC MUST BE IN IDLE MODE)
Single Character
LED Display
Action
Solid
Push and hold button until solid appears, release button. Display will blink.
Blinking
Push and hold button until required symbol displays.
or
CONFIGURING ELECTRIC HEAT SECTIONS
Solid
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.
INDOOR BLOWER TEST
Solid
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.
CONFIGURING UNIT SIZE CODES
Single Character LED
Display
Solid
Blinking
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 current active mode. LED display will go blank and then the Unit Size
Code will display for 2 to 5 seconds.
NOTE - If ten second period expires, or push button is held less than 3 seconds, control will automatically exit current active
mode and go into IDLE Mode without storing unit size code. If this occurs, then Unit Size Code configuring procedure must
be repeated.
ERROR CODE RECALL MODE (NOTE — CONTROL MUST BE IN IDLE MODE)
Solid
Solid
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
Solid
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.
Blinking
Push button to confirm command to delete codes. Error codes are cleared.
Page 34
CBX40UHV
Table 13. AHC Single Character Display — Error Codes (Communicating and Non-Communicating)
Alert
Code
Priority
Alert
How to Clear
Equipment is unable to communicate. This may indicate the existence of other alarms
/ 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.
Critical
The air-handler has lost communica­
tion with the rest of the system.
Critical
There is a frequency/distortion problem
with the power to the air-handler.
Critical
The 24VAC to the air-handler control is
lower than the required range of 18 to
30VAC.
Moder­
ate
There is a delay in the air-handler re­
sponding to the system.
Critical
The iComfort™ thermostat has lost
communication with the air-handler for
more than 3 minutes.
Critical
There is a hardware problem with the
air-handler control.
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.
Moder­
ate
An air-handler configuration jumper is
missing.
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.
Critical
The air-handler control parameters are
corrupted.
Reconfigure the system. Replace the control if heating or cooling is not available.
Critical
The air-handler control software is cor­
rupted.
Recycle power. If failure re-occurs, replace the control. System reset is required to
recover.
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.
Critical
The iComfort™ thermostat has found a
problem with the air-handler outdoor
sensor.
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.
Critical
The system has lost communication
with the or air-handler indoor blower
motor.
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.
Critical
The unit size code for the air-handler
and the size of blower motor do not
match.
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.
Critical
The unit size code for the air-handler
has not been selected.
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.
Critical
The air-handler's blower motor will not
start.
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.
Minor
The indoor blower motor is over heat­
ing.
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.
Critical
There is a problem with air-handle) dis­
charge air sensor.
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.
Minor
The blower cannot provide the re­
quested CFM due to high static.
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.
Minor
The indoor and outdoor unit capacities
do not match.
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.
CBX40UHV
Page 35
Table 13. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (continued)
Alert
Code
Priority
Alert
How to Clear
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.
Critical
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
Critical
Configuration link(s) not removed on control. Cut / remove R to O jumper. Applicable
The R to O jumper was not removed on
with non communicating outdoor unit with communicating indoor unit. The fault clears
the air-handler control board
after the R to O jumper is cut/removed.
Critical
The Y1 relay on the air-handler has
Operation stopped. Y1 relay failed. Pilot relay contacts did not close or the relay coil
failed. Either the pilot relay contacts did
did not energize. The indoor unit cannot verify that the relay is closed. The alarm
not close or the relay coil did not ener­
clears after a reset and Y1 input sensed.
gize.
Critical
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.
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.
Critical
The air-handler's electric heat is not
configured.
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.
Critical
Critical
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.
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.
Critical
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.
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.
Critical
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.
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.
Critical
There is a problem with the air-han­
dler's fifth stage electric heat. Either the
pilot relay contacts did not close, or the Heat section / stage 5 failed (same as code 351). Pilot relay contacts did not close,
relay coil in the electric heat section did or the relay coil in the electric heat section did not energize. The air-handler will oper­
not energize. The air-handler will oper­ ate on stage 1 heat only. The alarm clears after stage 2 relay is detected.
ate on first stage electric heat until the
issue is resolved.
Moder­
ate
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.
Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued.
Check the indoor line voltage, transformer output voltage. The alarm clears after the
voltage is higher than 20VAC for 2 seconds or after a power reset.
Page 36
CBX40UHV
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.
Table 14. Optional Side Return Stand (Upflow Only)
Model/Size
Kit Number
CBX40UHV-All Sizes
45K32
Down-flow Application
See the installation instructions provided with the downflow
kit.
Table 15. Optional Downflow Conversion Kits
(Downflow Only)
Model/Size
Kit Numbers
CBX40UHV-024, -030, and -036
83M57
CBX40UHV-042, -048, and -060
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
2. Reinstall screws.
Use the following procedures to configure the unit for
horizontal right-hand air discharge operations:
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.
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
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.
HORIZONTAL
DRAIN PAN
NO ADJUSTMENT IS NECESSARY
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
DRAIN PAN*
Up-Flow/
DOWNFLOW
DRAIN PAN
Horizontal Right-Hand Air Discharge Application in
High Humidity Areas
*FOR OPTIMUM PERFORMANCE,
REMOVE HORIZONTAL DRAIN PAN.
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.
Figure 24. Upflow Configuration
CBX40UHV
Page 37
1/2 IN. SCREWS MAXIMUM
ANGLE IRON OR
SHEET METAL
ELECTRICAL INLET
CLEARANCE 4 IN. (102 MM)
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
FRONT VIEW
END VIEW
TOP CAP SCREWS
CABINET
SUPPORT
Figure 26. Suspending Horizontal Unit
90º
BEND
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.
DRAIN PAN
REINSTALLED
HERE
DRAIN PAN
SHIPPING
LOCATION
———— DRAIN PLUGS ————
REINSTALLED HERE
REMOVED FROM HERE
COIL SHOWN IN UPFLOW POSITION FOR EASY CONVERSION
Horizontal Left-Hand Discharge Application
ALIGN HOLES
WITH HOLES
IN COIL END
PLATE.
Use the following procedures to configure the unit for
horizontal left-hand air discharge operations:
TOP
CAP
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.
90º
BEND
IMPORTANT
BACK COIL
END SEAL
Figure 27. Field Modification for Left-Hand Air
Discharge
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.
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.
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
Page 38
CBX40UHV
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
UPFLOW OR
DOWNFLOW
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.
RIGHT-HAND AIR
DISCHARGE
Best Practices
The following best practices are recommended to ensure
better condensate removal:
MAIN DRAIN ON
RIGHT
OVERFLOW
DRAIN ON LEFT
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.
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.
OVERFLOW DRAIN LINE
ABOVE
FINISHED
SPACE?
ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TO
ROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGE
OVERFLOW SWITCH KIT. WIRE KIT TO SHUT DOWN
COMPRESSOR PER INSTRUCTIONS.
LENNOX #
X3169
NO
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
VENT MUST EXTEND
ABOVE HEIGHT OF
COIL DRAIN PAN BY
TWO INCHES (51MM)
VENT
CLEAN OUT
PRESS IN
(DO NOT GLUE)
MAIN
DRAIN
1” X 3/4” X 3/4”
REDUCING
TEE WITH
PLUG
OVERFLOW
DRAIN
YES
NOTE — WHEN A AIR HANDLER IS LOCATED
ABOVE A FINISHED SPACE THE SECONDARY
DRAIN PAN MUST HAVE A LARGER FOOTPRINT
THAN THE AIR HANDLER.
MAIN
DRAIN
CUT TO
REQUIRED
LENGTH
LENNOX1 P-TRAP
49P66, J-TRAP #
91P90 OR ANY
PVC SCH 40 P- OR
J-TRAP 3/4”
SECONDARY
DRAIN PAN
PROVIDED
PIPE NIPPLE 2
2”
(51MM)
WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A
3/4” (19.1MM) SECONDARY DRAIN LINE MUST BE:
S
CONNECTED TO SECONDARY DRAIN PAN
SIDE VIEW
TRAP DEPTH
OR
S
FOR NEGATIVE PRESSURE COILS (BLOWER
AFTER COIL) TRAPS ARE REQUIRED ON ALL
DRAIN LINES CONNECTED TO COIL.
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).
1
LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90.
2
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.
Figure 30. Main Drain
CBX40UHV
Page 39
TO APPROVED
DRAIN
DRAIN LINE SHOULD
SLOPE A MINIMUM OF
ONE INCH PER 10
FEET (25MM PER 3
METERS)
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.
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.
4. Check to ensure that refrigerant lines are in good
condition and pipe insulation is intact.
SUPPLY
5. Inspect condition of condensate drain pan and piping
assembly. Disassemble and clean seasonally.
+
UNIT SHOWN IN
Up-Flow POSITION
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.
MANOMETER
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.
_
RETURN
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.
Page 40
CBX40UHV
See the tables below for replacement filter sizes.
MAINTENANCE
Table 16. MERV16 Disposable Filter (five inch)
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.
Unit Model No.
Filter Size Inches (mm)
Catalog #
CBX40UHV-024,
-030 and -036
20 x 20 x 5 (508 x 508 x 127)
X7935
-CBX40UHV-048,
-042, and -060
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
20 x 20 x 1 (508 x 508 x 25)
X1963
-CBX40UHV-048,
-042, and -060
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.
WARNING
Electric shock hazard. Can cause injury or
death. Before attempting to perform any
service or maintenance, turn the electrical
power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
At the beginning of each heating/cooling season, the
system should be checked as follows:
Filters
FILTER
COMPARTMENT
Figure 32. Tabs
IMPORTANT
Supply Air Blower
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.
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.
4. Replace panel.
CBX40UHV
BEND ALL THREE
TABS
Page 41
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).
Electric heat
Installed?
No
Finished
AHC recognizes
Unit Size Code?
Yes
Yes
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.
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
Which Heat
Mode?
Standard
EVENHEAT
W1 Call?
No
Refer to EVENHEAT Operation flow diagram, Air Handler or
ECB40 Electric Heat installation instructions.
Refer to Heat Pump or Cooling
Sequence of Operation flow
diagrams, Air Handler or ECB40
Electric
Heat
installation
instructions.
Yes
NUMBER OF HEAT SECTIONS DETECTED
T-STAT CALL
ONE (H1)
TWO (H1-H2)
THREE (H1-H3)
FOUR (H1-H4)
FIVE (H1-H5)
W1
H1
H1
H1
H1 AND H2
H1 AND H2
W2
H2
H2
H3
H3 AND H4
W3
H2
H3
H4
H5
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.
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.)
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.
Indoor blower will immediately start to delivery CFM as
set by heating mode jumper on AHC with activation of
first electric heat pilot relay.
At the completion of all heating demands, the indoor
blower will run for an additional 10 seconds before
de-energizing.
RECOMMEND — USE FIGURE 12 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
Figure 33. Air Handler Control Checkout
Page 42
CBX40UHV
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.
AHC in IDLE mode
(No heating, cooling or indoor fan operation)
Yes
To enter unit size code
configuration mode, PUSH and
HOLD button next to single
character LED display until dash
symbol appears, RELEASE button.
Turn room thermostat to
OFF
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
and capacity.
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.
No
Solid dash starts blinking
on single character LED
display.
UNIT SIZE
CODE
AIR HANDLER
MODEL
0
CBX32MV-018/024
1
CBX32MV-024/030
2
CBX32MV-036
3
CBX32MV-048
4
CBX32MV-060
5
CBX32MV-068
6
CBX40UHV-024
7
CBX40UHV-030
8
CBX40UHV-036
9
CBX40UHV-042
L
CBX40UHV-048
U
CBX40UHV-060
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.
PUSH and HOLD button to allow AHC to display unit size
code (letter or number) for each different air handler model
for three seconds.
NO
LED displays correct
Unit Size Code.
YES
Unit enters IDLE
Mode.
Figure 34. Configuring Unit Size Codes
CBX40UHV
Page 43
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.
Which Heat
Mode?
Standard
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
EVENHEAT
S
Configuration
Set desired Heating Mode Blower Speed jumper
pin.
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) .
Refer to EVENHEAT Operation flow diagram for
operation.
Refer to Air Handler Control Checkout flow diagram for
operation.
S
AHC in Idle Mode
(No heating cooling or
indoor fan 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
No
Turn room thermostat to OFF.
Push and hold button until the solid H symbol is displayed on the single
character LED display, then release button.
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.
B.
If relay coil current is detected within ten seconds, AHC will show a 1 on the single character LED display indicating that the first stage has been detected.
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.)
If relay coil current is not detected within ten seconds, the AHC will exit the current active mode and resume operation with electric heat disabled.
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.
Finished
Figure 35. Configuring / Detecting Electric Heat Elements
Page 44
CBX40UHV
5. EvenHeater® Operation
INPUTS
OUTPUTS
Target Discharge Air
Temperature Set at 85ºF
Target Discharge Air
Temperature Set at 100ºF
Target Discharge Air
Temperature Set at 115ºF/130ºF
Heat Pump First Stage
Heat Pump First Stage
Heat Pump First + First Electric
Heat Section (H1)
Y1 + Y2
Heat Pump First and Second
Stage
Heat Pump First and Second
Stage + 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.
Y1 + W1 and/or W2
Heat Pump First 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 Stage + First
Electric Heat Section (H1) Second
Electric Heat Section (H2) if num­
ber of electric heater sections de­
tected is more than two.
Y1 and Y2 + W1 and/or W2
Heat Pump First and Second
Stage+ First Electric Heat Sec­
tion (H1)
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.
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)
First Electric Heat Section (H1) +
Second Electric Heat Section (H2)
if number of electric heater sec­
tions 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.
Room Thermostat Demand
Y1
W1 and/or W2
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.
Heat Pump and electric heat
demand?
Increase target discharge air temperature by 15Fº
Yes
No
Timer delays for
120 seconds
One Stage
Last room thermostat Heat
up- staging action
More than one stage
A
Figure 36. EvenHeater® Operation
CBX40UHV
Page 45
Timer delays for 150
seconds
6. EvenHeater® Operation (continued)
EVENHEAT Operation
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.
Start Timer Delay
(Note 1)
A
No
Delay Timer
Finished or last
change was upstage
Electric heat ON
Delay Timer
Finished or last
change was downstage
Yes
Stop Delay Timer
Yes
No
No
Change in Heat
demand from room
thermostat?
No
Yes
Increase heat demand.
Y1 (with or without Y2) +
W1 and W2
No
Yes
Adjust Target Discharge
Air Temperature
Heat Pump OFF
Yes
W call with one
Electric Heat
Section ON
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.
More Electric Heat
available
Heat Pump ON
No
No
Yes
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)
Adjust Target
Discharge Air
Temperature
Adjust Target
Discharge Air
Temperature
Yes
Turn OFF One
Electric Heat Section
Discharge air temperature is
within target range?
Turn ON one Electric
Heat section
No
Above
Measured discharge air
temperature is above or below
target range?
Below
NOTE - Optional Outdoor Thermostat (Wired
between R and W3) will lockout electric
elements 3, 4 and 5.
Figure 37. EvenHeater® Operation (continued)
Page 46
CBX40UHV
7. Heat Pump Operation
CUT ON-BOARD LINK Y1-Y2
FOR TWO-STAGE A/C
Y1-Y2
2-STAGE
COMPR
CUT ON-BOARD LINK R -O.
R-O
HEAT
PUMP
R-DS
DEHUM
OR
HARMONY
CUT FOR OPTION
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
heating demand. (45 second indoor blower OFF delay)
4.
Simultaneous Heat Pump and electric heat call: Indoor Blower will operate at the
highest CFM requested by the heat pump or the electric heat blower speed selection.
IMPORTANT - USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 11,
CBX40UHV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
Single or Two-Stage Unit
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
AIR HANDLER CONTROL.
Heating
Cooling
Room thermostat calls for
1st stage?
Air Handler Control (AHC) receives inputs on Y1, and O
terminals
.
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 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.
Y1 input to the AHC will control the indoor blower according
, ramping and
to the cooling or heating mode blower speed
adjust selection jumper pins.
Yes
No
Room thermostat calls fornd2
stage?
Yes
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.)
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.)
Yes
Y2 terminal is an
input to the AHC.
The indoor blower
will be controlled
according to the
jumper pin
selections.
Still calling for 1st
Stage?
No
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 2nd
stage?
De−energize indoor blower per ramping
profile.
No
Figure 38. Heat Pump Operation
CBX40UHV
Page 47
Yes
3. Cooling Operation
Y1-Y2
2-STAGE
COMPR
CUT ON-BOARD LINK Y1-Y2 FOR
TWO-STAGE A/C
R-O
HEAT
PUMP
RECOMMEND - USE FIGURE 11 AS A REFERENCE
FOR SETTING JUMPER CONFIGURATIONS ON THE
AIR HANDLER CONTROL.
R-DS
DEHUM
OR
HARMONY
Room thermostat calls
for first
stage?
IMPORTANT - USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 11,
CBX40UHV JUMP AND LINK GUIDE FOR FURTHER DETAILS.
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.
Yes
Room thermostat calls
for second stage?
Yes
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.
No
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.
Yes
Y2 terminal is an
input to the AHC.
The indoor blower
will be controlled
according to the
jumper pin
selections.
Still calling for first
stage?
Yes
No
Yes
De-energize Y1 (and O in cooling) terminals on
AHC.
Still calling for
second stage?
NOTE - The outdoor unit control directly
controls the outdoor unit operation.
De-energize indoor blower per ramping
profile.
No
Figure 39. Cooling Operation
Page 48
CBX40UHV
CUT FOR OPTION
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.
4. Error Code / Recall Mode
AHC in Idle Mode
(No heating cooling or indoor fan
operation)
Yes
To enter Error Code Mode, push
and hold button next to single
character LED display until solid
E symbol appears,
release
button.
Turn room thermostat to OFF
Control will display up to ten error codes stored in
memory. If E 0 0 0 is displayed, there are no stored error
codes.
No
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.
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.
Solid c starts blinking on
single character LED
display.
NOTE — Error Codes are not cleared from memory.
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
CBX40UHV
Page 49
5. Indoor Blower Test
Blower Test Mode
AHC in Idle Mode
(No heating cooling or indoor fan
operation)
Yes
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.
No
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.
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.
Figure 41. Indoor Blower Test
Page 50
CBX40UHV
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.
CBX40UHV
Page 51
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.
1
1
2
Page 52
CBX40UHV
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.
1
1
2
CBX40UHV
Page 53
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.
1
3
1
4
4
2
Page 54
CBX40UHV
ECB40‐9CB - 208/230V Single-Phase Sequence of Operation
Second-Stage Heat (remove jumper between W2 and
First-Stage Heat
R)
1. W1 of the thermostat provides a W1 demand to the
3. When K32‐1 closes, the unit is ready for a second stage
AHC. The AHC outputs a 22VDC signal to the K32 relay.
heat demand. W2 of the thermostat provides a W2
K32-1 closes.
demand to the AHC. The AHC outputs a 22VDC signal
2. Assuming the N.C. primary (S15) and secondary (S20)
to the K33 relay.
limit switches are closed, electric heat element HE1 is
4. When K33‐1 closes, assuming the N.C. primary (S15)
energized.
and secondary (S20) limit switches are closed, electric
heat element HE2 is energized.
1
3
1
4
4
2
CBX40UHV
Page 55
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.
1
3
3
1
4
2
4
Page 56
CBX40UHV
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.
1
3
1
4
4
CBX40UHV
4
2
Page 57
1
4
2
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 assuming
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 assuming the N.C.
primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE5 and HE6 are energized.
1
3
4
3
1
4
1
3
4
3
Page 58
2
CBX40UHV
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.
1
3
3
1
4
2
4
CBX40UHV
Page 59
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)
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 assuming
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 assuming the N.C.
primary (S15) and secondary (S20) limit switches are closed, electric heat elements HE5 and HE6 are energized.
1
3
4
3
1
3
4
4
3
1
3
2
3
Page 60
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CBX40UHV
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