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7

Wiring Diagram—Blower (Variable Speed Motor)

 

Complete Installation

Pre-Start Check

Is unit properly located, level, secure, and serviceable?

Is the wiring neat, correct, and in accordance with the wiring 
diagram?

Is the air handler properly grounded and connected to a 
properly sized fuse or circuit breaker?

Is the thermostat correctly wired, level, and in a good 
location?

Are all access panels in place and secure?

Are any accessories properly installed?

Check Airflow (PSC Motor)

Cooling blower speed—if cooling is used

For proper cooling operation, the airflow through the indoor 
coil should be between 350 and 450 CFM per ton of cooling 
capacity (or 350 - 450 CFM per 12,000 Btu/h) based on the 
rating of the outdoor condensing unit.

The cooling blower speed is factory configured to provide 
correct airflow for 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 (12,000 Btu/h) of outdoor 
cooling capacity. The heating blower speed must be set 
according to the heater installation instructions if installed.

Power (Factory Wired)
Control (Factory Wired
                 Transformer   TR
               Blower Motor   MTR
     Ground Connection   GND
               Blower Relay   BWR

6-Pin Plug

18 R

18 BU

18 W

18 R

18 BU

18 W

18 BU/W

18 BK

18 OR

18 Y

18 G

18 BK

18 Y

16-Pin

Plug & Cap

R

C1

W2

O

Y2

Y1

G

W1

16-Pin
Plug & Cap

MTR

5-Pin Cap

18 G 
GND

5-Pin

Plug

R

C1

W1

O

Y2
Y1

G

EM

Hum

Control Board

18 BK

18 B

U

18 W

14 R

18 BK

18 Y

R  24V

14 BK

14 Y

L1

L2

COM

208V

24V

BU

R

TR

24V

240V

240

BWR

18 BR

(16)

1

2

3

4

5 6

1

2

3

4

5

Ther

mostat

Содержание WMB

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 11: ...11 ...

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

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