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Working With HVACR Condenser in Cold Climates

Special considerations must be taken when installing condensers in cooler climates. During the colder weather, a winterizing valve should be utilized to maintain head pressure. This valve is actuated by a pressure difference between its inlet and outlet. The figure shows a “Winterstat” brand. Other valves may be used such as a “Headmaster” valve. If system pump-down is a desired feature, the receiver must hold the normal refrigerant  charge plus the condenser charge with the bypass valve operating ̶ that is, partially open or intermittently opening and closing.EXCERPT FROM “TOOLS, CONTROLS AND TROUBLESHOOTING“, available from the ONLINE STORE at RSES.ORG.