6
460, 575-v Units
208/230-v Units
C09260
Fig. 7 -- Direct--Drive Supply Fan Assembly
Motor “rocking” on start--up —
When the motor first
starts, the rotor (and attached wheel) will “rock” back and
forth as the motor tests for rotational direction. Once the
correct rotational direction is determined by the motor
circuitry, the motor will ramp up to the specified speed.
The “rocking” is a normal operating characteristic of
ECM motors.
Troubleshooting the ECM motor —
Troubleshooting the
X13 ECM requires a voltmeter.
1. Disconnect main power to the unit.
2. Remove the motor power plug (including the control
BRN lead) and VIO control signal lead at the motor
terminals.
3. Restore main unit power.
4. Check for proper line voltage at motor power leads
BLK (at L terminal) and YEL (at N terminal). See
Table 2.
Table 2 – Motor Test Volts
Unit Voltage
Motor Voltage
Min---Max Volts
208/230
230
190---250
460
230
210---250
575
460
420---500
5. Using a jumper wire from unit control terminals R to
G, engage motor operation. Check for 24v output at
the defrost board terminal IFO.
6. Check for proper control signal voltages of 22V to
28V at motor signal leads VIO and BRN.
7. Disconnect unit main power. Apply lockout/tagout
procedures.
8. Reconnect motor power and control signal leads at
the motor terminals.
9. Restore unit main power.
10. The motor should start and run. If the motor does not
start, remove the motor assembly. Replace the motor
with one having the same part number. Do not
substitute with an alternate design motor as the
torque/ speed programming will not be the same as
that on an original factory motor.
Replacing the X--13 ECM Motor —
Before removing
the ECM belly--band mounting ring from old motor:
1. Measure the distance from base of the motor shaft to
the edge of the mounting ring.
2. Remove the motor mounting band and transfer it to
the replacement motor.
3. Position the mounting band at the same distance that
was measured in Step 1.
4. Hand--tighten mounting bolt only. Do not tighten
securely at this time.
5. Insert the motor shaft into the fan wheel hub.
6. Securely tighten the three motor mount arms to the
support cushions and torque the arm mounting screws
to 60 in--lbs (6.8 Nm).
7. Center the fan wheel in the fan housing. Tighten the
fan wheel hub setscrew and torque to 120 in--lbs (13.6
Nm).
8. Ensure the motor terminals are located at a position
below the 3 o’clock position (see Fig. 5). Tighten the
motor belly--band bolt and torque to 80 in--lbs (9.0
Nm).
Supply Fan (Belt--Drive)
The belt--drive supply fan system consists of a
forward--curved centrifugal blower wheel on a solid shaft
with two concentric type bearings, one on each side of the
48H
C
Summary of Contents for 48HC*04-14
Page 94: ...94 APPENDIX IV WIRING DIAGRAMS C14007 Fig 80 48HC A04 A06 YAC Power Diagram 230 1 60 48HC ...
Page 96: ...96 APPENDIX IV WIRING DIAGRAMS C14013 Fig 82 48HC A04 A06 YAC Power Diagram 575 3 60 48HC ...
Page 97: ...97 APPENDIX IV WIRING DIAGRAMS C14018 48HC ...
Page 98: ...98 APPENDIX IV WIRING DIAGRAMS C14019 48HC ...
Page 99: ...99 APPENDIX IV WIRING DIAGRAMS C13484 Fig 83 48HC D08 D09 YAC Power Diagram 230 460 3 60 48HC ...
Page 100: ...100 APPENDIX IV WIRING DIAGRAMS C14024 Fig 84 48HC D08 D09 YAC Power Diagram 575 3 60 48HC ...
Page 101: ...101 APPENDIX IV WIRING DIAGRAMS C14027 Fig 85 48HC D12 YAC Power Diagram 230 460 3 60 48HC ...
Page 102: ...102 APPENDIX IV WIRING DIAGRAMS C14029 Fig 86 48HC D12 YAC Power Diagram 575 3 60 48HC ...
Page 104: ...104 APPENDIX IV WIRING DIAGRAMS C14032 Fig 88 48HC D14 YAC Power Diagram 230 460 3 60 48HC ...
Page 105: ...105 APPENDIX IV WIRING DIAGRAMS C12462 Fig 89 48HC D14 YAC Power Diagram 575 3 60 48HC ...
Page 123: ...123 APPENDIX IV WIRING DIAGRAMS C12690 Fig 107 PremierLink System Control Wiring Diagram 48HC ...
Page 125: ...125 APPENDIX IV WIRING DIAGRAMS C14034 Fig 109 RTU Open Wiring Diagram 48HC ...