background image

9

Blower Performance Chart—Variable Speed Motor

The versatility of the variable speed motor enables the air handler 
to tailor its performance to the different modes of operation 
encountered in heating and cooling. All variable speed air 
handlers are capable of operation at more than one nominal 
airflow rate.The operation of a variable speed air handler blower 
at different airflow rates is determined by the control board taps 
and the thermostat. See the Blower Performance Chart—Variable 
Speed Motor.

Before beginning the setup, become familiar with the information 
found in the Blower Performance Chart—Variable Speed Motor. 
The data in the Blower Performance Chart—Variable Speed 
Motor is categorized by model size and mode of operation. Use 
the information provided to determine the CFM taps needed for 
cooling and heating.

Blower Performance Chart—Variable Speed Motor

CFM @ E.S.P. - inches W.C.

Air Handler 
Model

Energized Thermostat 
Terminal

Control 
Board  Tap

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

WMB36VB-1A

Y1

 

 

 

A

852

858

859

872

879

879

879

879

B

707

724

728

741

741

745

733

733

C

617

603

598

603

608

603

  

D

497

482

473

470

455

452

437

423

Y1/Y2

 

 

 

A

1,215

1,215

1,208

1,208

1,209

1,209

1,202

1,202

B

995

1,012

1,035

1,035

1,036

1,036

1,036

1,020

C

817

817

827

827

836

837

837

837

D

652

638

643

648

648

657

657

644

G

 

 

 

A

637

623

637

637

637

637

628

628

B

572

556

556

551

562

545

523

517

C

514

502

490

484

465

458

437

426

D

466

445

437

412

403

392

386

382

WMB48VB-1A

Y1

 

 

 

A

1,134

1,123

1,123

1,113

1,102

1,091

1,079

1,074

B

991

972

956

949

937

923

909

909

C

847

826

807

793

778

753

736

712

D

687

664

646

619

612

581

557

531

Y1/Y2

 

 

 

A

1,676

1,656

1,635

1,624

1,613

1,608

1,608

1,598

B

1,435

1,404

1,398

1,398

1,392

1,380

1,375

1,362

C

1,234

1,220

1,212

1,205

1,197

1,184

1,169

1,161

D

995

987

978

979

962

953

946

937

G

 

 

 

A

799

785

763

746

724

707

683

655

B

681

665

646

629

611

580

548

522

C

577

536

513

475

456

427

388

369

D

480

428

394

343

307

278

  

WMB60VB-1A

Y1

 

 

 

A

1,246

1,231

1,211

1,180

1,143

1,099

1,065

1,053

B

1,121

1,104

1,078

1,044

993

969

944

927

C

977

952

900

864

836

817

807

797

D

863

811

764

738

724

707

694

677

Y1/Y2

 

 

 

A

1,835

1,834

1,809

1,787

1,775

1,762

1,733

1,692

B

1,644

1,637

1,623

1,609

1,601

1,572

1,542

1,487

C

1,392

1,380

1,374

1,361

1,322

1,296

1,255

1,220

D

1,214

1,193

1,177

1,139

1,094

1,035

1,028

997

G

 

 

 

A

913

874

826

791

768

757

737

729

B

836

790

739

713

705

694

675

661

C

739

691

643

636

624

610

600

585

D

675

610

582

572

556

547

528

502

NOTES:

Humidistat will reduce cooling airflow by 10% in high humidity.

Adjust the Control Board Tap (+) will increase airflow by 10%, while the Control Board Tap (-) will decrease airflow by 12%.

Adjust the Control Board Tap (-) test will cause the motor to run at 70% of full airflow. Use this for troubleshooting only.

At the start of a call for cooling, there is a short run at 82% of airflow for 7.5 minutes.

At the end of a call for cooling, there is a blower delay of 1 minute.

Summary of Contents for WMB

Page 1: ...ANDLER SAFETY 1 INSTALLATION REQUIREMENTS 1 Tools and Parts 2 Location Requirements 2 Installation Configurations 3 Electrical Requirements 3 Ductwork Requirements 4 INSTALLATION INSTRUCTIONS 4 Inspect Shipment 4 Install Ductwork 4 Install Filter 4 Make Electrical Connections 5 Complete Installation 7 SEQUENCE OF OPERATION 10 AIR HANDLER MAINTENANCE 10 ASSISTANCE OR SERVICE 10 Accessories 10 WARRA...

Page 2: ... very humid space If installed in an unconditioned space sealant should be applied around the electrical wires refrigerant tubing and condensate lines where they enter the cabinet Electrical wires should be sealed on the inside where they exit the conduit opening Sealant is required to prevent air leakage into and condensate from forming inside the air handler control box and on electrical control...

Page 3: ...of major components such as the blower assembly Provide enough clearance between the suspension rods and the air handler to allow removal of the blower access panel Installation Configuration Options NOTE Typical installations with optional WEM modular evaporator coil are shown ElectricalRequirements NOTES Use copper conductors only All field wiring must be done in accordance with National Electri...

Page 4: ...o not install the unit as your claim may be denied InstallDuctwork IMPORTANT Install ductwork in accordance with NFPA 90B Standard for the Installation of Warm Air eating and Air Conditioning Sytems latest edition and any local codes Connect supply air duct to the flange on top of the unit If an isolation connector is used it must be non flammable A return air duct system is recommended If the uni...

Page 5: ... transformer to the 208 Volt terminal on the transformer See the appropriate wiring diagram for your model WARNING Electrical Shock Hazard Disconnect all power supplies before servicing Replace all parts and panels before operating Failure to do so can result in death or electrical shock WARNING Electrical Shock Hazard Electrically ground air handler Connect ground wire to ground terminal marked G...

Page 6: ...t N E C Class 2 Plug Pin Location Amp 350781 1 6 Pin Cap TD Time Delay Optional TR Transformer BWR Blower Relay MTR Blower Motor CAP Motor Capacitor GND Ground Connection BK Black W White R Red G Green BU Blue Y Yellow BWR 3 6 4 1 5 2 18 BK 12 BK 12 BK 12 BK 12 BK 12 BK 12 BK 12 BK 12 BK 12 Y 12 Y LS3 LS4 12 Y 12 Y SEQ2 2nd Stage 1st Stage LS1 LS2 SEQ1 CB2 L1B L2B L2A L1A GND CB1 GND 14 BK 14 Y 14...

Page 7: ...an outdoor condensing unit or heat pump that matches the maximum cooling capacity rating of the air handler If the outdoor condensing unit is smaller than the maximum cooling capacity rating for the air handler the cooling blower speed may need to be changed Refer to Blower Performance Chart PSC Motor IMPORTANT The cooling blower speed must be set to provide a minimum of 350 CFM airflow per ton 12...

Page 8: ...nce Chart Variable Speed Motor NOTE If using a humidistat the dehumidify resistor located on the bottom right of the control board must be removed to enable it See Control Board Taps and Dehumidify Resistor The HUM terminal on the board must be connected to the Normally Closed contact of the humidistat so that the board senses an open circuit on high humidity If a humidistat is used the dehumidify...

Page 9: ...556 551 562 545 523 517 C 514 502 490 484 465 458 437 426 D 466 445 437 412 403 392 386 382 WMB48VB 1A Y1 A 1 134 1 123 1 123 1 113 1 102 1 091 1 079 1 074 B 991 972 956 949 937 923 909 909 C 847 826 807 793 778 753 736 712 D 687 664 646 619 612 581 557 531 Y1 Y2 A 1 676 1 656 1 635 1 624 1 613 1 608 1 608 1 598 B 1 435 1 404 1 398 1 398 1 392 1 380 1 375 1 362 C 1 234 1 220 1 212 1 205 1 197 1 18...

Page 10: ...occurs at 50 of the normal airflow rate 350 CFM minimum Reduced Airflow Operation For situations where humidity control is a problem the variable speed motor can be enabled to operate at a 10 reduction in the normal airflow rate under the control of a humidistat This can be achieved by connecting to a standard humidity control that is normally closed and opens on humidity rise The Control Board Th...

Page 11: ...11 ...

Page 12: ...late Dealer name____________________________________________________ Address ________________________________________________________ Phone number__________________________________________________ Model number __________________________________________________ Serial number __________________________________________________ Installation date ________________________________________________ 0650329...

Reviews: