Application Engineering |
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B U L L E | T | I | N |
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Start |
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Is the compressor |
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| WARNING! |
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| Allow time to cool | Disconnect and lockout |
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running? | No | overheated? | Yes |
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| the power before |
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| proceeding |
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Yes |
| No |
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Observe the compressor |
| Perform troubleshooting |
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| to determine why the |
| Put the system back into | Remove one wire from |
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suction & discharge |
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| compressor isn’t |
| operation and retest | the modulation coil |
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pressures |
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| running |
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Are pressures |
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changing with the |
| Operation |
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| Measure the resistance |
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modulation | Yes | is normal |
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| of the coil |
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cycle? |
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No |
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Measure the voltage at |
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| Coil has continuity |
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the modulation coil |
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| and isn’t grounded? | No | |
terminals |
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| Yes |
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Is voltage present, |
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| Replace modulation |
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| Troubleshoot the |
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| valve, follow valve |
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coinciding with the |
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No | modulation control |
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| replacement |
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modulation cycle? |
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| instructions |
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Yes |
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Figure 10
Modulation Troubleshooting
Replace modulation
coil
Put the system back into
operation and retest
© 2012 Emerson Climate Technologies, Inc. | 17 |
Printed in the U.S.A. |
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