Table
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| Requirements: For units equipped with secondary supply probe only. | |
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| Pass/Fail Criteria: The temperature difference between primary and secondary probe | |
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| (supply) is compared. | |
Supply Probe Test | NOTE | ||
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| If this test fails, | |
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| and the SUPPLY/ RETURN TEST) pass, because of the multiple tests, the | |
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| display will read ’P 5’ ’PASS’. | |
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| Requirements: For units equipped with secondary return probe only. | |
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| Pass/Fail Criteria: The temperature difference between primary and secondary | |
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| probe (return) is compared. | |
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| NOTES | |
Return Probe Test | 1. If this test fails, | ||
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| (this test and the SUPPLY/ RETURN) pass, because of the multiple | |
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| tests, the display will read “P 5,” “PASS.” | |
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| 2. The results of | |
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| clear control probe alarms. | |
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| Setup: The system is operated through a sequence of events to test the compo- | |
| Refrigerant Probes, | nents. The sequence is: Step 1, | |
P6 | Compressor | unloader valve open. Open then close the suction modulation valve. Monitor | |
suction pressure; Step 3, open suction modulation valve to a known position; | |||
and | |||
| Step 4, close suction modulation valve to a know position; Step 5, open econo- | ||
| Refrigeration valves | ||
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| mizer valve; Step 6, close unloader valve; Step 7, open unloader valve; Step 8, | |
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| close economizer valve; Step 9, | |
Discharge | If alarm 64 is activated any time during the first 45 second period of Step 1, the | ||
Thermistor Test | test fails. | ||
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Suction | If alarm 69 is activated any time during the first 45 second period of Step 1, the | ||
Thermistor Test | test fails. | ||
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| Discharge Pressure | If alarm 65 is activated any time during the first 45 second period of Step 1, the | |
Sensor Test | test fails. | ||
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Suction Pressure | If alarm 66 is activated any time during the first 45 second period of Step 1, the | ||
Sensor Test | test fails. | ||
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Compressor Current | Compressor current is tested before and after start up. If current does not in- | ||
Draw Test | crease, the test fails. | ||
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Suction Modulation | Suction pressure is measured before and after the valve opens. If suction pres- | ||
Valve Test | sure does not increase, the test fails. | ||
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Economizer | Suction pressure is measured during Steps 4 and 5. If suction pressure does not | ||
Valve Test | increase, the test fails. | ||
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| Unloader Valve Test | Suction pressure is measured during Steps 6 and 7. If suction pressure does not | |
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| increase, the test fails. |