AMX PTM-D15 Service Manual Page 41
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10-4. Trouble Diagnosis of Fan Motor
10-4-1. Outdoor Fan Motor
This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil
resistance, and the following procedure should be used to check the motor.
Perform the trouble diagnosis by Test Run mode described on Installation Instructions.
[Trouble symptom 1] The fan does not stop when the outdoor unit stops. Outdoor unit controller trouble
[Trouble symptom 2] The fan motor does not rotate when the outdoor unit is operating.
(Diagnostic procedure)
* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the outdoor
unit controller (3 locations).
(Diagnostic results)
All of the above measured values are normal. Fan motor trouble (Replace the motor.)
Any one of the above measured values is not normal. Outdoor unit controller trouble
(Replace the controller .)
(Reference) DC motor connector pin arrangement
Pin 1: Vs (white)
Pin 2: Not used
Pin 3: Not used
Pin 4: Gnd (black)
Pin 5: Vcc (red)
Pin 6: FG (blue)
Pin 7: Vsp (yellow)
[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the outdoor
unit operates.
(There is trouble in the system that provides feedback of motor rotation speed from the
motor to the outdoor unit controller.)
[Trouble symptom 4] Fan motor rotation speed does not change during outdoor unit operation.
[Trouble symptom 5] Fan motor rotation speed varies excessively during outdoor unit operation.
(Remedy for symptom 3 to 5)
It is not possible to identify whether the trouble is outdoor unit controller trouble or motor trouble.
Therefore, first replace the outdoor unit controller, then (if necessary) replace the DC motor.
Important:
(A) Turn OFF the power before connecting or disconnecting the motor connectors.
(B) When performing voltage measurement at the outdoor controller connector for (3) in the table
below, the DC motor will trip and voltage output will stop approximately 10 seconds after
operation is started. For this reason, to measure the voltage again, first turn OFF the outdoor
unit power, then, measure the voltage in Test Run mode.
(1) Vs-Gnd: Between pin 1 and pin 4
(2) Vcc-Gnd: Between pin 5 and pin 4
(3) Vsp-Gnd: Between pin 7 and pin 4
Measurement location
DC 110V or more
DC 14V or more
After fluctuating 4 times between DC 1.0 to 4.3V
(1 sec. ON) and DC 0 V (1 sec. OFF), the DC
motor trips.
Normal value
39
- SM700647-01 1
- KHS0971 + CH0971 3
- KHS1271 + CH1271 3
- Important! 4
- Please Read Before Starting 4
- Table of Contents 5
- 1. OPERATING RANGE 7
- 2. SPECIFICATIONS 8
- Indoor Unit KHS0971 10
- Indoor Unit KHS1271 11
- Outdoor Unit CH0971 12
- Outdoor Unit CH1271 13
- 3. DIMENSIONAL DATA 15
- 4. REFRIGERANT FLOW DIAGRAM 17
- 5. PERFORMANCE DATA 18
- Indoor Air Temp.73 19
- °F (21.1°C) 20
- °F (26.7°C) 21
- Indoor Unit KHS0971 KHS1271 23
- Outdoor Unit CH0971 CH1271 24
- 7. INSTALLATION INSTRUCTIONS 25
- 7-1-2. Outdoor Unit 26
- WIRING SYSTEM DIAGRAM 27
- 7-3-1. Mounting on a Wall 28
- IMPORTANT 29
- Indoor Unit 30
- Control Unit 31
- Pull the cover upward 32
- 9. FUNCTIONS 33
- HIGH POWER 34
- NIGHT SETBACK 34
- Lamp colors 34
- Timer backup 34
- 9-2. Protective Functions 35
- Defrosting Sequence 36
- Defrost detection and release 36
- < Clock display > 37
- Test run mode 37
- Self-diagnostics mode 37
- 10. TROUBLESHOOTING 37
- PROCEDURE 37
- (1) Checking the indoor unit 40
- (2) Checking the outdoor unit 40
- 10-4-1. Outdoor Fan Motor 41
- (1) Noise malfunction 42
- Resistance 43
- PCB Ass'y 44
- 12. REFRIGERANT R410A: 45
- INSTRUCTION MANUAL 52
- APPENDIX 52
- Features 53
- Contents 54
- Product Information 54
- Alert Symbols 54
- Installation Location 55
- Electrical Requirements 55
- Safety Instructions 55
- Names of Parts 56
- OI-802-6-EG 57
- Remote Control Unit (Display) 58
- Remote Control Unit 59
- OI-802-9EG 60
- Using the Remote Control Unit 61
- OI-802-11EG 62
- OI-802-12-EG 63
- OI-802-13EG 64
- OI-802-14-EG 65
- OI-802-15EG 66
- OI-802-16-EG 67
- Special Remarks 68
- Setting the Timer 69
- Setting the Timer (continued) 70
- Using the 1-Hour OFF Timer 71
- Tips for Energy Saving 71
- OI-802-21EG 72
- Operation without the Remote 73
- Care and Cleaning 73
- Care and Cleaning (continued) 74
- Troubleshooting 76
- Operating Range 76
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