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Lennox CBA27UHE-018, Manual, Page: 34 / 45

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Lennox CBA27UHE-018 Manual Download Page 34

Page 34

B-ECB29‐2.5, -4, ‐5, -6, 4CB, 5CB, 6CB - 208/230V SINGLE PHASE - 
SEQUENCE OF OPERATION

 1- When there is a call for heat, W1 of the thermostat ener­

gizes the electric heat relay K35 with 24VAC.

 2- When K35‐1 closes, the blower is energized on heat­

ing speed.

 3- Assuming the N.C. primary (S15) and secondary (S20)

limit switches are closed, electric heat element HE1 is en­
ergized.

Summary of Contents for CBA27UHE-018

Page 1: ...ations Page 32 The Elite CBA27UHE units are high efficiency blower coils featuring an all aluminum coil Several models are avail able in sizes ranging from 1 1 2 through 5 tons 5 3 through 17 6 kW The...

Page 2: ...x 8 Blower motor output hp 1 2 1 2 1 2 1 2 1 Filters Size of filter in 20 x 20 x 1 20 x 20 x 1 20 x 20 x 1 20 x 20 x 1 Shipping Data 1 package lbs 137 137 150 150 ELECTRICAL DATA Voltage 1 phase 60hz...

Page 3: ...r motor output hp 1 1 1 1 Filters Size of filter in 20 x 24 x 1 20 x 24 x 1 20 x 24 x 1 Shipping Data 1 package lbs 186 186 199 ELECTRICAL DATA Voltage 1 phase 60hz 208 230V 1ph 208 230V 1ph 208 230V...

Page 4: ...3 584 142 750 186 905 248 80 365 110 358 108 521 147 702 194 864 256 CBA27UHE 030 BLOWER PERFORMANCE External Static Pressure in w g Air Volume and Motor Watts Tap 1 Tap 2 Tap 3 Tap 4 Tap 5 cfm Watts...

Page 5: ...53 50 1032 195 1374 315 1588 431 1660 465 1801 558 60 980 204 1336 331 1561 440 1618 472 1770 582 70 929 223 1295 339 1510 457 1593 493 1733 600 80 867 235 1227 363 1488 473 1552 508 1703 618 CBA27UHE...

Page 6: ...UHE PARTS ARRANGEMENT FIGURE 1 CONTROL BOX ELECTRIC HEAT SECTION BLOWER COMPARTMENT COIL HORIZONTAL DRAIN PAN EXPANSION VALVE COMPLETE WITH SCREEN BLOWER ACCESS PANEL COIL ACCESS PANEL FILTER ACCESS P...

Page 7: ...l Neutralize electro static charge by touching hand and all tools on an unpainted unit surface before performing any service procedure II UNIT COMPONENTS A Control Box See figure 2 for CBA27UHE contro...

Page 8: ...its use a DPDT relay to energize the blow er motor during a call for electric heat only When the relay coil is energized on an electric heat call a set of N O contacts closes to energize the blower mo...

Page 9: ...at Components ECB29 parts arrangement is shown in figures 5 through 10 All electric heat sections consist of components mounted to the electric heat vestibule panel and electric heating elements ex po...

Page 10: ...Single phase electric heat uses two pole terminal strips while three phase electric heat uses three pole terminal strips Heating Elements HE1 through HE6 Heating elements are composed of helix wound...

Page 11: ...Page 11 FIGURE 6 ECB29 8 8CB 9CB 10 10CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT...

Page 12: ...Page 12 FIGURE 7 ECB29 12 5CB 15CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT...

Page 13: ...Page 13 FIGURE 8 ECB29 8 10 208 230 THREE PHASE ECB29 15CB 208 230 THREE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT...

Page 14: ...Page 14 FIGURE 9 ECB29 20CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT...

Page 15: ...Page 15 FIGURE 10 ECB29 25CB 30CB 208 230 SINGLE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT...

Page 16: ...Page 16 FIGURE 11 ECB29 20CB 25CB 208 230 THREE PHASE ELECTRIC HEAT VESTIBULE PARTS ARRANGEMENT...

Page 17: ...0 20 500 4 1 36 4 40 8 kW 5 lbs ECB29 8 12L50 Terminal Block ECB29 8CB 12L52 45A Circuit breaker 1 208 6 0 20 500 4 1 41 45 220 6 7 22 900 4 1 47 4 50 230 7 3 25 100 4 1 47 4 50 240 8 0 27 300 4 1 47...

Page 18: ...12L52 45A Circuit breaker 1 208 6 0 20 500 4 1 41 45 220 6 7 22 900 4 1 47 4 50 230 7 3 25 100 4 1 47 4 50 240 8 0 27 300 4 1 47 4 50 9 kW 5 lbs ECB29 9CB 13T79 60A Circuit breaker 2 208 6 8 23 100 4...

Page 19: ...700 4 1 57 60 230 9 2 31 400 4 1 57 60 240 10 0 34 100 4 1 57 60 12 5 kW 10 lbs ECB29 12 5CB 13T88 1 25A Circuit breaker 1 50A Circuit breaker 2 208 9 4 32 000 4 1 24 38 25 4 40 62 70 220 10 5 35 800...

Page 20: ...erminal Block ECB29 10CB 13T87 60A Circuit breaker 2 208 7 5 25 600 4 1 50 4 50 220 8 4 28 700 4 1 57 60 230 9 2 31 400 4 1 57 60 240 10 0 34 100 4 1 57 60 12 5 kW 10 lbs ECB29 12 5CB 13T88 1 25A Circ...

Page 21: ...208 11 3 38 400 4 1 44 4 45 220 12 6 43 000 4 1 50 50 230 13 5 47 000 4 1 50 50 240 15 0 51 200 4 1 50 50 ECB29 15 28K48 3 25A Fuses 1 440 12 6 43 000 2 1 23 25 460 13 5 47 000 2 1 24 25 480 15 0 51 2...

Page 22: ...kW 10 lbs ECB29 12 5CB 13T88 1 25A Circuit breaker and 1 50A Circuit breaker 2 208 9 4 32 000 7 6 28 38 4 30 4 40 66 80 220 10 5 35 800 7 6 31 43 4 35 4 45 75 80 230 11 5 39 200 7 6 31 43 4 35 4 45 75...

Page 23: ...30 62 70 220 16 8 57 300 7 6 40 30 4 40 4 30 70 70 230 18 4 62 700 7 6 40 30 4 40 4 30 70 70 240 20 0 68 200 7 6 40 30 4 40 4 30 70 70 ECB29 20 28K49 3 35A Fuses 1 440 16 8 57 300 460 18 4 62 700 480...

Page 24: ...50A Circuit breaker 2 208 9 4 32 000 7 6 28 38 4 30 4 40 66 80 220 10 5 35 800 7 6 31 43 4 35 4 45 75 80 230 11 5 39 200 7 6 31 43 4 35 4 45 75 80 240 12 5 42 600 7 6 31 43 4 35 4 45 75 80 15 kW 12 l...

Page 25: ...0 30 4 40 4 30 70 70 230 18 4 62 700 7 6 40 30 4 40 4 30 70 70 240 20 0 68 200 7 6 40 30 4 40 4 30 70 70 ECB29 20 28K49 3 35A Fuses 1 440 16 8 57 300 4 0 33 35 460 18 4 62 700 4 0 34 35 480 20 0 68 20...

Page 26: ...0A Circuit breaker 2 208 9 4 32 000 7 6 28 38 4 30 4 40 66 70 220 10 5 35 800 7 6 31 43 4 35 4 45 75 80 230 11 5 39 200 7 6 31 43 4 35 4 45 75 80 240 12 5 42 600 7 6 31 43 4 35 4 45 75 80 15 kW 12 lbs...

Page 27: ...40 30 4 40 4 30 70 70 230 18 4 62 700 7 6 40 30 4 40 4 30 70 70 240 20 0 68 200 7 6 40 30 4 40 4 30 70 70 ECB29 20 28K49 3 35A Fuses 1 440 16 8 57 300 4 0 33 35 460 18 4 62 700 4 0 34 35 480 20 0 68 2...

Page 28: ...wer operation is dependent on thermostat con trol system 2 Generally blower operation is set at thermostat sub base fan switch With fan switch in ON position blower operates continuously With fan swit...

Page 29: ...sive buildup salt WARNING Disconnect power before performing any maintenance At the beginning of each heating cooling season the sys tem should be checked as follows A Filters IMPORTANT Filter access...

Page 30: ...signal of 24VAC on these taps Instead of energizing a motor speed winding on a PSC motor for each demand heat cool constant fan the communication voltage directs the motor to operate at the torque val...

Page 31: ...o these motors There are two inputs needed to operate this motor a high voltage con stant power source and the low voltage communication that selects the torque value in each tap per demand Checking 2...

Page 32: ...ric heat section 4 Blower motor B3 is energized on heating speed after K20 1 closes 5 Economizer if used is energized SINGLE STAGE COOLING Y1 to Y2 jumper in place 6 When there is a call for cooling Y...

Page 33: ...Page 33 460V Single Phase...

Page 34: ...1 When there is a call for heat W1 of the thermostat ener gizes the electric heat relay K35 with 24VAC 2 When K35 1 closes the blower is energized on heat ing speed 3 Assuming the N C primary S15 and...

Page 35: ...24VAC 2 When K32 1 closes the blower is energized on heat ing speed 3 When K32 2 and K32 3 close assuming N C prima ry S15 and the secondary S20 limit switches are closed electric heat element HE1 is...

Page 36: ...se and assuming the N C primary S15 and secondary S20 limit switches are closed elec tric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 4 When K33 1 closes the unit is...

Page 37: ...osed electric heat element HE1 is energized SECOND STAGE HEAT remove jumper between W2 and R 4 When K33 1 closes the unit is ready for a second stage heat demand When K33 2 and K33 3 close assuming th...

Page 38: ...and K32 3 close assuming the N C pri mary S15 and secondary S20 limit switches are closed electric heat element HE2 is energized SECOND STAGE HEAT remove jumper between W2 and R 5 W2 of the thermosta...

Page 39: ...W2 and R 5 When K34 1 closes the unit is ready for a second stage heat demand W2 of the thermostat sends a second stage heat demand energizing the electric heat relays K33 and K117 with 24VAC 6 When K...

Page 40: ...t W1 of the thermostat energizes the electric heat contactor K1 2 When K1 contacts M1 and M2 close the blower is ener gized on heating speed 3 When K1 contactor closes assuming the N C primary S15 and...

Page 41: ...he thermostat energizes the electric heat contactor K1 2 When K1 contacts M1 and M2 close the blower is ener gized on heating speed 3 When K1 contactor closes assuming the N C primary S15 and secondar...

Page 42: ...ary S15 and secondary S20 limit switches are closed electric heat elements HE1 HE2 and HE3 are energized SECOND STAGE HEAT remove jumper between W2 and R 4 W2 of the thermostat sends a second stage he...

Page 43: ...C primary S15 and secondary S20 limit switches are closed electric heat element HE3 is energized SECOND STAGE HEAT remove jumper between W2 and R 5 When K34 2 closes the unit is ready for a second st...

Page 44: ...s to the Y1 ter minal on the coil blower The Y1 demand will be isolated from the cooling tap speed on the indoor blower motor by removal of the jumper between Y1 and Y2 on the indoor unit s terminal s...

Page 45: ...ISE NOT USED PINS 4 8 12 NOT USED CONNECT FOR 0 50 0 80 IN W G ONLY OTHERWISE NOT USED Y1 Y2 JUMPER IN FOR SINGLE STAGE REMOVED FOR TWO STAGE K183 DEHUMIDIFICATION RELAY AND WIRING HARNESS 0 10 0 49 I...

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