Bard I60H1D, I42H1D, I36H1D, I48H1D, I30H1D Troubleshooting Indoor ECM Blower Motors Cont’d

Page 56

TROUBLESHOOTING INDOOR ECM™ BLOWER MOTORS (Cont’d.)

Replacing ECM Control Module

To replace the control module for the GE variable-speed indoor blower motor you need to take the following steps:

1.You MUST have the correct replacement module. The controls are factory programmed for specific operating modes. Even though they look alike, different modules may have completely different functionality.

USING THE WRONG CONTROL MODULE VOIDS ALL PRODUCT WARRANTIES AND MAY PRODUCE UNEXPECTED RESULTS.

2.Begin by removing AC power from the unit being serviced. DO NOT WORK ON THE MOTOR WITH AC POWER APPLIED. To avoid electric shock from the motor’s capacitors, disconnect power and wait at least 5 minutes before opening motor.

3.It is not necessary to remove the motor from the blower assembly, nor the blower assembly from the unit. Unplug the two cable connectors to the motor control assembly. There are latches on each connector. DO NOT PULL ON THE WIRES. The plugs remove easily when properly released.

4.Locate the screws that retain to the motor control bracket to the sheet metal of the unit and remove them. Remove two (2) nuts that retain the control to the bracket and then remove two (2) nuts that retain sheet metal motor control end plate. Refer to Figure 30.

5.Disconnect the three (3) wires interior of the motor control by using your thumb and forefinger squeezing the latch tab and the opposite side of the connector plug, gently pulling the connector. DO NOT PULL ON THE WIRES, GRIP THE PLUG ONLY. Refer to Figure 30.

6.The control module is now completely detached from the motor. Verify with a standard ohmmeter that the resistance from each motor lead (in the motor plug just removed) to the motor shell is >100K ohms. Refer to Figure 31. (Measure to unpainted motor end plate.) If any motor lead fails this test, do not proceed to install the control module. THE MOTOR IS DEFECTIVE AND MUST BE REPLACED. Installing the new control module will cause it to fail also.

7.Verify that the replacement control is correct for your application. Refer to the manufacturer's authorized replacement list.

USING THE WRONG CONTROL WILL RESULT IN IMPROPER OR NO BLOWER OPERATION. Orient the control module so that the 3-wire motor plug can be inserted into the socket in the control. Carefully insert the plug and press it into the socket until it latches. A SLIGHT CLICK WILL BE HEARD WHEN

PROPERLY INSERTED.

8.Reverse the steps #5, 4, 3 to reconnect the motor control to the motor wires, securing the motor control cover plate, mounting the control to the bracket, and mounting the motor control bracket back into the unit. MAKE SURE THE ORIENTATION YOU SELECT

FOR REPLACING THE CONTROL ASSURES THE CONTROL'S CABLE CONNECTORS WILL BE LOCATED DOWNWARD IN THE APPLICATION SO THAT WATER CANNOT RUN DOWN THE CABLES AND INTO THE CONTROL. DO NOT OVERTIGHTEN THE BOLTS.

9.Plug the 16-pin control plug into the motor. The plug is keyed. Make sure the connector is properly seated and latched.

10.Plug the 5-pin power connector into the motor. Even though the plug is keyed, OBSERVE THE PROPER ORIENTATION. DO NOT FORCE THE CONNECTOR. It plugs in very easily when properly oriented. REVERSING THIS PLUG WILL CAUSE

IMMEDIATE FAILURE OF THE CONTROL MODULE.

11.Final installation check. Make sure the motor is installed as follows:

a.Motor connectors should be oriented between the 4 o’clock and 8 o’clock positions when the control is positioned in its final location and orientation.

b.Add a drip loop to the cables so that water cannot enter the motor by draining down the cables. Refer to Figure 32.

The installation is now complete. Reapply the AC power to the HVAC equipment and verify that the new motor control module is working properly. Follow the manufacturer's procedures for disposition of the old control module.

 

 

 

Figure 30

 

 

Figure 31

 

 

Control Disassembly

 

 

Winding Test

 

 

 

 

 

Motor Connector

 

Only remove

 

From Motor

 

(3-pin)

 

 

Hex Head Bolts

Push until

 

 

 

 

 

 

Latch Seats

 

 

 

 

 

Over Ramp

 

 

 

 

 

 

Circuit

 

 

 

 

 

 

Board

 

 

 

 

ECM 2.0

 

 

Motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Motor OK when

 

Note:

 

 

 

 

R > 100k ohm

 

Use the shorter

 

 

 

 

 

 

bolts and

 

 

 

 

 

 

alignment pin

 

 

 

 

Figure 32

 

supplied when

 

 

 

 

 

 

 

 

 

 

 

replacing an

 

 

 

 

Drip Loop

 

ECM 2.0

 

 

Motor Connector

 

 

 

control.

 

 

(3-pin)

Back of

Connector Orientation

 

ECM

 

 

Control

Between 4 and 8 o'clock

 

EON

Control Connector

 

 

 

2.3/2.5

 

 

 

5.0

 

(16-pin)

 

 

 

 

 

 

 

 

 

 

Power Connector

 

 

 

 

 

(5-pin)

 

 

 

 

 

 

 

 

 

Drip Loop

Manual

2100-549G

 

 

 

 

 

Page

56 of 59

 

 

 

 

 

Image 56
Contents TEC Series Packaged Heat Pump Contents Getting Other Information and Publications For More INFORMATION, Contact These PublishersGeneral Ansi Z535.5 DefinitionsFactory BUILT-IN Electric Heat Table Indoor Blower PerformanceElectrical Specifications Unit Specification Sheet Unit DimensionsHandling Unit After Removal from Skid Shipping DamageUnit Removal from Skid Wall Mounting Bracket Location Minimum Installation HeightSeismic Considerations Bracket Wall Section View Center of Gravity Center of GravityRequired Clearances & Recommended Access Compressor Shipping Bolts Removal of AIR DuctDucted Application Basic Unit 3 Riser Application 6 Riser Application Duct Work FiltersSupply Duct Connections Filter LocationWith Energy Recovery Ventilator Condensate DrainWith no Vent Option With Commercial Room VentilatorUnit Mounting 16 3/4 NON-TAPPING 16 1/2 NON-TAPPINGTEC Unit Component Location Wiring Main PowerMounting the Unit Wiring LOW Voltage Wiring LOW Voltage ConnectionsOperating Voltage Range Wall ThermostatsBasic Heat Pump with no Ventilation Package SC SC SCY2 B/W1 W2 W3 CRV Wiring Harness Heat Pump with CRV, Without CO2 ControlHeat Pump with CRV and CO2 Control To functionERV Wiring Harness Heat Pump with ERV, Without CO2 ControlHeat Pump with ERV and CO2 Control ON/OFF Cycling ERV Wiring Harness Bard #8403-067 Heat Pump with ERV and CO2 Control Fully ModulatingHeat Pump with Combination CRV and DB Economizer N Vent Code Safety Practices Topping OFF System ChargeImportant Installer Note Phase MonitorThree Phase Scroll Compressor Start UP Information Service HintsSound Pressure Service PortsSequence of Operation Defrost Cycle Defrost CycleControl Wiring Setting the Ventilation CFM LevelsTeccommercial Room Ventilator System General Description Recommended Control SequencesCRV Motor SPEED/CFM Configuration Vent Option INTAKE/EXHAUST SpeedsCRV Speed Change Terminal Access Control Wiring TECECON. Sequence of Operation Economizer Control CircuitMotor SPEED/CFM Configuration Heating Mode OperationVentilation Mode Tecenergy Recovery Ventilator System General Description Changing Ventilation CFM Rates in Manual Mode Changing to Fully Modulating ModePerformance and Application Data Winter Heating Performance Indoor Design Conditions 70F DBERV Manual Mode Jumper PIN on M Terminal ERV Modulating Mode Jumper PIN on P TerminalVentilation Airflow Diagram Indoor Air Supply Air Outdoor AirERV Access Specifications Control Board CONFIGURATION/SETTINGWiring Accessing Menu ParametersMounting Selection of Voltage OutputsMenu Descriptions Energy Recovery Ventilator Maintenance General Information Cleanability and PerformanceMaintenance Procedures Quarterly Maintenance FrequencyAnnual Maintenance Codes Function Solid State Heat Pump Control Troubleshooting ProcedureTroubleshooting Checking Temperature Sensor Temperature F VS Resistance R of Temperature SensorTroubleshooting ECM 142R Outdoor FAN Motor Troubleshooting ECM 142R Outdoor FAN Motor Cooling ModeHeat Pump Mode Replacing the MotorTroubleshooting Indoor ECM Blower Motors Troubleshooting Indoor ECM Blower Motors Cont’d FAN Blade Setting Dimensions Control Connector Motor HalfPower Connector Motor Half Refrigerant ChargeFull Load Cooling PRESSURE/TEMPERATURE Full Load Heating PRESSURE/TEMPERATUREPart Load Cooling PRESSURE/TEMPERATURE Part Load Heating PRESSURE/TEMPERATURE