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Lennox Air Handler CB26UH, Информация об устройстве, Страница: 15 / 15

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Page 15

VIII−WIRING DIAGRAMS AND SEQUENCE OF OPERATIONS

3

5

2

POWER (FACTORY WIRED)
POWER (FIELD WIRED)
CONTROL (FACTORY WIRED)
CONTROL (FIELD WIRED)
CONTROL CIRCUIT WIRING TO BE 24 VOLT, N.E.C. CLASS 2

18 BK

18 W

18 BU

18 G

18 R

BK

W

BU

G

R

W2

W1

C

G

R

T

O THERMOST

A

T

TRANSFORMER

220

208/240

VOLTAGE

BY

OTHERS

TO BLOWER
GROUND LUG

1

2

3

4

5

6

1

2

3

4

5

6

6−PIN

PLUG

18 BU

18 R

18 BU

18 G

14 R (LO)

14 BK (HI)

14 Y (COM)

14 R

18 BU

14 BK

18 BU

14 R

14 G

18 W

18 BK

18 BK

12 BK

12 BK

12 BK

12 BK

12 Y

12 Y

12 BK

12 BK

GND

R

BK

Y+

MOTOR
CAPACITOR

BR/W

BR

BLOWER

RELAY

5

6

4

3

1

2

TIME DELAY
H =10 TO 60 SECONDS TO HEAT UP
C =10 TO 60 SECONDS TO COOL DOWN

BLOWER

MOTOR

1

2

3

4

5

6

6−PIN

PLUG

14 Y

ELECTRIC HEAT − 1ST STAGE

ELECTRIC HEAT − 2ND STAGE

12 Y

12 Y

18 BU

12 BK

12 BK

GND

CIRCUIT BREAKER 1 (OPT)

CIRCUIT BREAKER 2 (OPT)

14 BK

L1A

L2A

L1B

L2B

5

4

3

1

5

4

3

1

SEQUENCER 1

SEQUENCER 2

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

heat, if used.

  3− When there is a call for heat W1 of the thermostat  en-

ergizes sequencer relay 1.

 4− Assuming limit switch 1 and 2 are closed, sequencer

relay 1 energizes HE1 and HE2.

 5− Indoor blower is energized on heating speed, after se-

quencer timing is complete.

SECOND STAGE HEAT

 6− W2 in the thermostat energizes sequencer relay 2.

 7− Assuming limit switch 3 and 4 are closed sequencer

relay energizes HE3 and HE4.

COOLING

8− When there is a call for cooling, G of the thermostat ener-

gizes blower time delay relay.

9− After a 30 second delay (approximate) blower relay ener-

gizes blower motor on cooling speed. 

Blower will also

delay 30 seconds after cool demand is satisfied.

Содержание Air Handler CB26UH

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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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