Amana ASH13018 Service Manual download pdf (Page 43)

SERVICING

Lines 1 and 2 will be connected

for 12OVAC Power Connector

applications only

Gnd

AC Line Connection

}

816

OUT - OUT +

DJUST +/-

G (FAN)

Y1 Y/Y2

COOL

EM Ht/W2

DELAY

24 Vac (R)

COMMON2

HEAT

W/W1

BK/PWM (SPEED)

COMMON1 O (REV VALVE)

16-PIN ECM HARNESS CONNECTOR

If you do not read voltage and continuity as described, the

problem is in the control or interface board, but not the motor.

If you register voltage as described , the ECM power head is

defective and must be replaced.

S-16C CHECKING ECM MOTOR WINDINGS

1. Disconnect the 5-pin and the 16-pin connectors from the

ECM power head.

2. Remove the 2 screws securing the ECM power head and

separate it from the motor.

3. Disconnect the 3-pin motor connector from the power

head and lay it aside.

4. Using an ohmmeter, check the motor windings for

continuity to ground (pins to motor shell). If the ohmme-

ter indicates continuity to ground, the motor is defective

and must be replaced.

5. Using an ohmmeter, check the windings for continuity

(pin to pin). If no continuity is indicated, the thermal limit

(over load) device may be open. Allow motor to cool and

retest.

16-pin

connector

5-pin

connector

3-pin motor

connector

S-16D ECM CFM ADJUSTMENTS

MBE MOTOR

This section references the operation characteristics of the

MBE model motor only. The ECM control board is factory

set with the dipswitch #4 in the “ON” position and all other

dipswitches are factory set in the “OFF” position. When

MBE is used with 2-stage cooling units, dipswitch #4

should be in the "OFF" position.

For most applications, the settings are to be changed

according to the electric heat size and the outdoor unit

selection.

The MBE product uses a General Electric ECM

motor.

This motor provides many features not available on the

traditional PSC motor. These features include:

• Improved Efficiency

• Constant CFM

• Soft Start and Stop

• Improved Humidity Control

MOTOR SPEED ADJUSTMENT

Each ECM™ blower motor has been preprogrammed for

operation at 4 distinct airflow levels when operating in

Cooling/Heat Pump mode or Electric Heat mode. These 4

distinct levels may also be adjusted slightly lower or higher

if desired. The adjustment between levels and the trim

adjustments are made by changing the dipswitch(s) either

to an "OFF" or "ON" position.

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Amana ASH13018 Service Manual Page 43

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