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Lennox Air Handler CB26UH, Unit Information, Page: 2 / 15

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SPECIFICATIONS 

General
D t

Model Number (R−22)

CB26UH−018

CB26UH−024

CB26UH−030

CB26UH−036

Data

Model Number (R−410A)

CBX26UH−018

CBX26UH−024

CBX26UH−030

CBX26UH−036

Nominal tonnage

1.5

2

2.5

3

Connections

Suction/Vapor line (o.d.) − in. (mm) sweat

3/4 (19)

3/4 (19)

7/8 (22.2)

7/8 (22.2)

Liquid line (o.d.) − in. (mm) sweat

3/8 (9.5)

3/8 (9.5)

3/8 (9.5)

3/8 (9.5)

Condensate − in. (mm) fpt

(2) 3/4 (19)

(2) 3/4 (19)

(2) 3/4 (19)

(2) 3/4 (19)

Blower

Wheel nominal diameter x width − in. (mm)

10 x 6

(254 x 152)

10 x 6

(254 x 152)

11 x 8

(279 x 203)

11 x 8

(279 x 203)

Blower motor output − hp (W)

1/4 (187)

1/4 (187)

1/4 (187)

1/3 (249)

1 

Filters

Size of filter − in. (mm)

16 x 20 x 1

(406 x 508 x 25)

16 x 20 x 1

(406 x 508 x 25)

18 x 20 x 1

(457 x 508 x 25)

18 x 20 x 1

(457 x 508 x 25)

ELECTRICAL DATA 

Voltage − 1 phase (60 hz)

208/240V

208/240V

208/240V

208/240V

2 

Maximum overcurrent protection (unit only)

15

15

15

15

3 

Minimum circuit ampacity (unit only)

1.5

1.5

1.6

1.8

Shipping Data −1 package − 

lbs. (kg)

129 (58)

131 (59)

148 (67)

148 (67)

SPECIFICATIONS

General
D t

Model Number (R−22)

CB26UH−042

CB26UH−048

CB26UH−060

Data

Model Number (R−410A)

CBX26UH−042

CBX26UH−048

CBX26UH−060

Nominal tonnage

3.5

4

5

Connections

Suction/Vapor line (o.d.) − in. (mm) sweat

7/8 (22.2)

7/8 (22.2)

7/8 (22.2)

Liquid line (o.d.) − in. (mm) sweat

3/8 (9.5)

3/8 (9.5)

3/8 (9.5)

Condensate − in. (mm) fpt

(2) 3/4 (19)

(2) 3/4 (19)

(2) 3/4 (19)

Blower

Wheel nominal diameter x width − in. (mm)

11 x 8

(279 x 203)

11 x 8

(279 x 203)

11−1/2 x 9

(292 x 229)

Blower motor output − hp (W)

1/3 (249)

1/2 (373)

1/2 (373)

1 

Filters

Size of filter − in. (mm)

18 x 25 x 1

(457 x 635 x 25)

18 x 25 x 1

(457 x 635 x 25)

18 x 25 x 1

(457 x 635 x 25)

ELECTRICAL DATA

Voltage − 1 phase (60 hz)

208/240V

208/240V

208/240V

2 

Maximum overcurrent protection (unit only)

15

15

15

3 

Minimum circuit ampacity (unit only)

1.9

2.6

4.1

Shipping Data −1 package − 

lbs. (kg)

172 (78)

177 (80)

190 (86)

1 

Filter is not furnished and must be field supplied.

2

 

HACR type circuit breaker or fuse.

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 (75

_

C).

OPTIONAL ACCESSORIES − MUST BE ORDERED EXTRA 

Model

−018
−024

−030
−036

−042
−048

−060

Circuit Breaker Cover Kit

93M85

93M85

93M85

93M85

Down−Flow Conversion Kit

12W61

12W61

12W61

12W61

Horizontal Support Frame Kit

56J18

56J18

56J18

56J18

Side Return Unit Stand

 (Up−Flow Only)

45K32

45K32

45K32

45K32

Single Point Power Source Control Box

 (for Electric Heat)

21H39

21H39

21H39

21H39

Wall Hanging Bracket Kit 

(Up−Flow Only)

45K30

45K30

45K30

45K30

Summary of Contents for Air Handler CB26UH

Page 1: ... CB26UH and CBX26UH cabinets Information contained in this manual is intended for use by ex perienced HVAC service technicians only All specifications are subject to change Procedures outlined in this manual are pre sented as a recommendation only and do not supersede or re place local or state codes IMPORTANT Improper installation adjustment alteration service or maintenance can cause property da...

Page 2: ...ns Suction Vapor line o d in mm sweat 7 8 22 2 7 8 22 2 7 8 22 2 Liquid line o d in mm sweat 3 8 9 5 3 8 9 5 3 8 9 5 Condensate in mm fpt 2 3 4 19 2 3 4 19 2 3 4 19 Blower Wheel nominal diameter x width in mm 11 x 8 279 x 203 11 x 8 279 x 203 11 1 2 x 9 292 x 229 Blower motor output hp W 1 3 249 1 2 373 1 2 373 1 Filters Size of filter in mm 18 x 25 x 1 457 x 635 x 25 18 x 25 x 1 457 x 635 x 25 18...

Page 3: ... cfm L s cfm L s 10 25 1560 705 1405 635 20 50 1480 670 1340 610 30 75 1390 630 1270 575 40 100 1290 585 1185 540 50 125 1170 530 1090 495 60 150 1015 480 975 460 NOTE All air data measured external to unit with dry coil and 1 inch non pleated air filter in place Electric heaters have no appreciable air resistance CB X 26UH 042 BLOWER PERFORMANCE External Static Pressure Air Volume at Specific Blo...

Page 4: ...e The units come with factory installed check and expansion valve for all applications The TXV valve has been installed internally for a cleaner installation and is accessible if required ELECTROSTATIC DISCHARGE ESD Precautions and Procedures CAUTION Electrostatic discharge can affect electronic components Take precautions during unit instal lation and service to protect the unit s electronic cont...

Page 5: ...n heating speed refer to unit wiring diagram 3 Time Delay Relay The blower time delay is a 24 volt N O relay wired to the blower relay See unit diagram The delay is between 10 and 60 seconds and delays the blower on and off time in the cooling cycle BLOWER ASSEMBLY FIGURE 3 B Blower Motor B3 CB26UH and CBX26UH units use single phase direct drive blower motors with a run capacitor Figure 3 shows th...

Page 6: ...ions Each stage of the 208 230 electric heat is protected by a primary high temperature limit Each stage uses the same style of limit The primary limit is wired in series with a heat element When either limit opens the corre sponding heat element is de energized All other heating elements remain energized The primary high temperature limit opens at 150_F 5_F 65 5_C 2 8_C on a temperature rise and ...

Page 7: ...W 1 Btuh Amps Circuit 1 Circuit 2 Circuit 1 Circuit 2 5 kW ECB26 5 99M64 Terminal Block ECB26 5CB 99M65 Ci it B k 208 3 8 12 800 1 6 19 6 30 ECB26 5CB 99M65 Circuit Breaker 220 4 2 14 300 1 5 22 3 30 230 4 6 15 700 1 5 22 3 30 240 5 0 17 100 1 5 22 3 30 7 5 kW ECB26 7 99M66 Terminal Block ECB26 7CB 99M67 Ci it B k 208 5 6 19 200 1 6 28 7 45 ECB26 7CB 99M67 Circuit Breaker 220 6 3 21500 1 5 32 8 45...

Page 8: ...l Load A 2 Minimum Circuit Ampacity 3 Maximum Overcurrent Protection Volt kW 1 Btuh Amps Circuit 1 Circuit 2 Circuit 1 Circuit 2 5 kW ECB26 5 99M64 Terminal Block C 26 C 99 6 C 208 3 8 12 800 1 9 20 0 30 ECB26 5CB 99M65 Circuit Breaker 220 4 2 14 300 1 8 22 6 30 230 4 6 15 700 1 8 22 6 30 240 5 0 17 100 1 8 22 6 30 7 5 kW ECB26 7 99M66 Terminal Block C 26 C 99 6 C 208 5 6 19 200 1 9 29 0 45 ECB26 ...

Page 9: ...l Load Amps 2 Minimum Circuit Ampacity 3 Maximum Overcurrent Protection Volt kW 1 Btuh Amps 240V Circuit 1 Circuit 2 Circuit 1 Circuit 2 5 kW ECB26 5 99M64 Terminal Block C C C 208 3 8 12 800 4 1 22 2 30 ECB26 5CB 99M65 Circuit Breaker 220 4 2 14 300 3 9 24 7 30 230 4 6 15 700 3 9 24 7 30 240 5 0 17 100 3 9 24 7 30 7 5 kW ECB26 7 99M66 Terminal Block C 26 C 99 6 C 208 5 6 19 200 4 1 31 2 45 ECB26 ...

Page 10: ...cation Set unit so that it is level Connect return and supply air plenums as re quired using sheet metal screws 4 Install units that have no return air plenum on a stand that is at least 14 from the floor This will allow proper air return FIGURE 6 Upflow Configuration HORIZONTAL DRAIN PAN Remove for best upflow performance UPFLOW DRAIN PAN UPFLOW DRAIN CONNECTIONS Both sides use on side or other H...

Page 11: ...ne assembly from the air handler 4 Remove the drain plugs from back of horizontal drain pan and reinstall in the front holes 5 Remove two screws and blowoff prevention bracket BP BRACKET in figure 10 Rotate the bracket 180º and reinstall using the same screws 6 Move horizontal drain pan to the opposite side of the coil Plugged drain holes will now be toward the back of the unit see figure 11 7 Re ...

Page 12: ...drain 4 Install a 3 trap in both the primary and secondary drain lines as close to the unit as practical see figure 13 Make sure the top of the trap is below the connection to the drain pan to allow complete drainage of the pan FIGURE 13 Typical Condensate Drain Connection AIR HANDLER DRAIN CONNECTION DRAIN LINE ANTI SIPHON AIR VENT DRAIN TRAP Secondary Drain Not Shown 3 Min 1 Min 12 Max DRAIN PAN...

Page 13: ...UTO 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 de mand from the thermostat After a 30 second time delay approximate the indoor blower will energize 2 The refrigerant circuit is charged with R 22 or R 410 refrigerant See condensing unit rating plate for cor rect...

Page 14: ...nels before operating Failure to do so can result in death or electrical shock 1 Disconnect all power supplies 2 Remove the air handler access panel 3 Locate pin number 2 on the blower relay Two black wires are connected to this terminal pin One connects to pin number 5 on the blower relay one connects to an inline splice connecting to a red or blue wire 4 Remove the wire going to the 4 pin blower...

Page 15: ...LIMIT SWITCH 1 LIMIT SWITCH 2 HE3 HE4 LIMIT SWITCH 3 LIMIT SWITCH 4 14 Y L2 14 BK L1 208V 240V COM 24V 24 C 4 3 1 2 H H HE1 HE2 HEATER ELEMENTS USED 5KW HE1 7 5 10KW HE1 HE2 15KW HE1 HE2 HE3 20KW HE1 HE2 HE3 HE4 4 1 3 8 9 7 6 6 A ECB26UH ECBX26UH SEQUENCE OF OPERATION FIRST STAGE HEAT 1 Line voltage is routed to transformer and blower relay 2 24VAC is supplied to indoor thermostat and electric hea...

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