Head-Pressure Control Valve Service
There are several possible causes for system malfunction with “refrigerant side” head-pressure control. These may be difficult to isolate from each other. As with any form of system troubleshooting, it is necessary to know the existing operating temperatures and pressures before system problems can be determined. Once the malfunction is established, it is easier to pinpoint the cause and then take suitable action. Table 11-5 lists the most common malfunctions, the possible causes, and the remedies.