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Pressure and Temperature Symptoms Chart


Issue:
This document contains a Pressure and Temperature Symptoms Chart.

Product line:
All Cooling Units.

Environment:
All Product models, all serial numbers.

Cause:
The purpose of this document is to provide a clear communication on what the relationship between pressure, temperature, and the use of Superheat and Subcooling to troubleshoot.

Resolution:

Pressure and Temperature Symptoms Chart:
Symptoms Exhibited *Condition Solutions
Suction
Pressure		Discharge
Pressure		Super
Heat		Sub
Cooling		Comp.
Amps		SymptomPossible Solutions
↓↓↓↓↓Light loadCheck filter, blower speed tap selected, blower motor, wheel, and capacitor.
↓↓↑↓↓Insufficient refrigerant charge; undercharge; leakCheck system for leak(s). Recover refrigerant, repair leak(s), evacuate system to 500 microns, and re-charge with refrigerant.
↓↓↑↑-Restriction in refrigerant circuitLook for significant temperature difference at point of restriction. Possible incorrect orifice pin (too small) or TXV stuck closed.
↑↑↑↑↑Heavy loadDue to excessive air flow across coil or open return duct in unconditioned space. Check blower speed tap setting (too high) and return duct for leakage.
↑↑↓↓↑Restricted outdoor coilInsufficient air flow across Condenser coil. Check cleanliness of coil. Check condenser fan motor, blade, and capacitor.
↑↑↓↑↑Excessive refrigerant charge; overchargeRecover refrigerant from system and weigh in refrigerant
↑↑↓↕↑Air and/or Non-condensable in systemRecover refrigerant from system, evacuate system to 500 microns, and weigh in refrigerant.
↑↓↓↓-Over feeding Metering deviceCheck for proper pin size or loose TXV sensing bulb or TXV stuck open.
↑↓↕↕-Compressor defectiveI.E. runs but doesn't pump, abnormally low Amp draw and abnormally high compressor temperature may be indicated.
* "Normal" refers to Pressures, Temperatures, and/or values obtained at rated air flow under a given set of conditions and assumes that no changes have been made to factory refrigerant charge.








Publicerad för:APC Sweden

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Pressure and Temperature Symptoms Chart Rev. 20111128.pdfPressure and Temperature Symptoms Chart Rev. 20111128.pdf [667.27 KB]
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Utforska mer
Produktfamilj
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Uniflair Med/Large Room Cooling
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Uniflair Room Cooling Accessories