Variable Speed

Indoor Blower Motor

Robert Helt

Technical Conference - Panama City Beach, Fl - 2002

ECM™ Variable Speed Motor

Normal Blower Operation• Set Switches 1 & 2 for System Tonnage• Set 3 & 4 for 350,400, or 450 CFM/Ton• Set 5 & 6 for Time Delay / Enhanced Mode• Set 7 & 8 for Desired Heating Airflow• Verify CFM with Flashing LED• Cont. Fan Airflow is 1/2 Cooling CFM• Cycle Power For New Switch Settings

Variable Speed Motor Operation

• G - On / Off Command for the Motor• Y - Selects Cooling Or Heat Pump Heating CFM• Ylo - Selects Low Speed Cool or HP Heating CFM• O - Tells Motor Cooling Mode is Selected• BK - Selects De-Humidify Mode when O is ON, or

PWM Input for Variable Speed Mode Operation• W1 - Selects Low Heat CFM, Elect. or Gas• W2 - Selects High Heat on Gas Furnaces• W3 - Selects High Heat on Electric Heat (If Used)

Time Delay Operation• The Time Delay Mode Senses Y or Ylo and G• The Off Time Begins When Y or Ylo & G Turn Off,

simultaneously. • The Off Time Airflow will be 100% or 50% of the

Last Airflow Depending on Option Selected• If Continuous Fan Mode is Selected, No Delay

Operation Will Occur Because: G On, Cont Fan, is Considered a New Mode

• Comfort “R” Mode, Delay Off CFM, will be 50% of the Last Requested CFM

Variable Speed Motor Continuous Fan Wiring Options

• Normal 50% of Cooling Airflow

• Optional 40%, 80% and 100 % of Cooling Airflow Can be Provided

• Some Wiring Tricks are Required

• Get Your Thinking Cap On

G

G

BK

R

Note: Only wiring involved is shown. Normal or Comfort “R” Mode.

Single Speed or Two Speed systems.

BK to R Jumper

Circulation Airflow Fan Power (3 ton typical)

50% (normal) 60 - 100 watts

G

Y

G

Y

BK

R

Y

Note: Only wiring involved is shown. Single Speed System.

Normal Mode Only.

G to Y

Jumper

BK to R

Jumper

Circulation Airflow Fan Power (3 ton typical)

100 % 400 - 500 watts

G

Y

O

G

Ylo

O

Y

BK

Y

O

Note: Only wiring involved is shown. Single Speed system.

Normal Mode.

Jumper G to Ylo to O

Circulation Airflow Fan Power (3 ton typical)

40% (normal) 60 - 100 watts

Jumper

Y to BK

G

Ylo

O

G

Ylo

O

BK

Ylo

O

Note: Only wiring involved is shown. Two Speed system.

Normal Mode.

Jumper G to Ylo to O

Circulation Airflow Fan Power (3 ton typical)

40% (normal) 60 - 100 watts

G

Y

O

G

Y

O

BK

Y

O

Note: Only wiring involved is shown. Single Speed System.

NON - Comfort “R” Mode.

Jumper

G to Y to O

Circulation Airflow Fan Power (3 ton typical)

80% 200 - 350 Watts

Cooling Mode andHumidistat Operation

• Motor in Cooling Mode, when O Energized

• BK is Humidistat Enable, 24Vac

• Airflow is Reduced by 20% when BK is Off and O is On (Motor is in Cooling Mode)

• De-Humidify mode - O is On, BK is Off

• Delay Off airflow will be Reduced by 20% in De-Humidify mode

G

Y

G

Y

BK

R

Y

Note: Only wiring involved is shown. Normal Mode Only, Not Comfort “R”.

Do not use Humidistat with Comfort “R”.

BK to R Jumper Replaced by Humidistat

Humidistat

Humidistat opens on Rising Humidity

De-Humidify Mode• Operates in Cooling Mode, O - On• G, Y or Ylo, O, and BK to Operate

• Install Humidstat BK to R to De-Humidify

• Provides 80% Airflow When

Humidistat is Open, BK is Off

• Delay Off airflow will be Reduced 20% if Humidistat is Open

Comfort “R” Mode“Enhanced Mode”

• Comfort “R” Mode (Enhanced Mode) Operates in Cooling or Heat Pump Heating Modes, Air Handlers. Cooling Mode only in Gas Furnace, with “O”.

• G, Y or Ylo, are the Only Inputs Required, A/H. In a Gas Furnace Application, O is also Required.

• Comfort “R” Mode Operates in Low Speed and High Speed for Two Speed Systems

10%MOISTUREREMOVAL

100%

80%

50%

OFF OFF

FIRSTSTAGE

1 7.5 3

minute

minutes minutes

DehumidifyWarm AirEnhancedComfort

EnhancedEfficiency

COMPRESSOR OPERATION ON OFF

Only if required

SYSTEM AIRFLOW (CFM)

1 Stage, Comfort “R” Mode1 Stage, Comfort “R” Mode““Enhanced Mode”Enhanced Mode”

Two Stage Comfort “R” Mode

Variable Speed Reminders

• If Enhanced Mode (Comfort “R”) is Selected, Jumper R to BK

• If Enhanced Mode is Selected, Set 400 CFM/Ton• On Air Handlers, Comfort “R” Mode works in

Heating and Cooling • On Gas Furnaces, Comfort “R” Mode works in

Cooling when “O” is energized• On Packaged Units, G is not the Master on-off switch

VSPD Reminders, cont.R to BK Jumper, Reminders

• Remove BK Jumper if Humidistat is installed

• Remove if Variable Speed Mode, PWM Input

• Remove for Special Continuous Fan Modes

• Leave in for Standard Operation

• Leave in for Enhanced Mode Operation

G

Y

O

G

Y

BK

R

O

Y

O

Comfort “R” Can Operate in Heat Pump and Cooling Modes

BK to R Jumper

Circulation Airflow Fan Power (3 ton typical)

50% (normal) 60 - 100 watts

Variable Speed Tools

Trouble Shooter Kit Order Pub. No. 34-3403-01

Test WireGo - No Go Cable

Two Colors

Variable Speed Tools

The Test Board is used in place of the Variable Speed Fan Motor

Problem DiagnosisUsing Troubleshooting Tools

• Verify Signals to Motor w/Troubleshooter

• LED’s Indicate Which Dip Switches are in the ON Position

• LED’s Indicate Which Control Lines are Energized

• Verify Motor Operation w/Go-No Go Cable

Problem DiagnosisUsing In-Board Electronics

• Apply “G” and Motor Should Operate

• If Motor Runs Very Slow With Fast Flashing CFM LED - No Programming, Replace Module

• Wrong CFM Indication or Flashes: Check Dip Switch Settings and 24 Volt Inputs

• Check for Label Indicating Proper Part Numbers and Mnemonics

Where is the BK Jumper?Old style A/H Interface Board

New Variable Speed Interface Board

The New Variable Speed Control Box

Variable Speed A/H Wiring

LVTB and BK Jumper

Replace the Module Not the Motor/Module combination

Return Analysis Confirms less than 10 Total Motor Failures

Indoor Variable Speed Motor

Replacement Modules

Variable Speed Draft InducerTroubleshooter BoardPub No. 34-3404-01

Variable Speed Module Programming

• PC Card and Cable for Local Parts Distributor Programming

• Four Blank Modules for 56 Variable Speed Applications

• Reduced Replacement Inventory - Saves Money

• Improves Your Responsiveness to the Dealer & Homeowner

• Internet Software Updates

• Availability - ??? ??? ???

• Limited Quantities

Variable Speed Indoor Motor Programmer

• Shipped with PC card, cables and instruction manual• Software to run the program will be downloaded through

the Internet• The software will reside on the users PC• When new VS software is released for production the web

site will be updated• Before the software is downloaded the user must agree to

the LICENSING AGREEMENT GE HAS PROVIDED• FAILURE TO ABIDE BY THE AGREEMENT MAY

RESULT IN LEGAL RECOURSE BY GE

Variable Speed Outdoor Fan Is Module Replacement Desired?

Replacement Module for New VSPD Outdoor Fan

Motors?