30RAP UNIT | CUTOUT |
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SIZE | psig |
| kPa | psig |
| kPa |
650 |
| 4482 | 500 |
| 3447 |
ASTP Protection Trip — All
Fig. 34 — Advanced Scroll Temperature
Protection Label
Advanced scroll temperature protection is a form of inter- nal discharge temperature protection that unloads the scroll compressor when the internal temperature reaches approxi- mately 300 F. At this temperature, an internal
To manually reset ASTP, the compressor should be stopped and allowed to cool. If the compressor is not stopped, the motor will run until the motor protector trips, which occurs up to 90 minutes later. Advanced scroll temperature protection will
reset automatically before the motor protector resets, which may take up to 2 hours.
High Discharge Gas Temperature Protection — Units equipped with digital compressors have an additional thermis- tor located on the discharge line, If discharge temperature ex- ceeds 265 F (129.4 C), the digital compressor will be shut off.
Alarms will also occur if the current sensor board malfunc- tions or is not properly connected to its assigned digital input. If the compressor is commanded OFF and the current sensor reads ON, an alert is generated. This will indicate that a com- pressor contactor has failed closed. In this case, a special mode, Compressor Stuck on Control, will be enabled and all other compressors will be turned off. An alarm will then be enabled to indicate that service is required. Outdoor fans will continue to operate. The first outdoor fan stage is turned on immediately. The other stages of fan will be turned on as required by SCT.
Alarms and Alerts — These are warnings of abnormal or fault conditions, and may cause either one circuit or the whole unit to shut down. They are assigned code numbers as described in Table 42.
Automatic alarms will reset without operator intervention if the condition corrects itself. The following method must be used to reset manual alarms:
Before resetting any alarm, first determine the cause of the alarm and correct it. Enter the Alarms mode indicated by the LED on the side of the scrolling marquee display. Press
ENTER and until the
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| 120 |
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| 110 |
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Time |
| 100 |
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| 90 |
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Recommended Cooling |
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(Minutes) | 80 |
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70 |
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60 |
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50 |
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40 |
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30 |
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20 |
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10 |
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| 0 |
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| 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
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| Compressor Unloaded Run Time (Minutes) |
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*Times are approximate.
NOTE: Various factors, including high humidity, high ambient temperature, and the presence of a sound blanket will increase
Fig. 35 — Recommended Minimum Cool Down Time After Compressor is Stopped*
65