For this reason control systems are designed to combineīoth compressor stages as the first heating stage. So heat is needed the most when it is the least available from the heat pumps. It helps to know that a heat pump loses capacity as the ambient temperature drops. Before beginning to troubleshoot it, one must know what components are supposed to be operating in each mode. SpecificĬombinations of components need to be energized and operating to facilitate the different modes of operation. That system has a variety of operational modes 2 stages of cooling, 2 stages of heat, a defrost mode, and a fan only mode. A two stage heat pump with two compressors, four outdoorįan motors, an indoor blower motor and two reversing valves is a different story.
When the control system calls, these two components need to operate. One needs to know whether a particular component should be operating or energized or not operating or not energized.Ī window air conditioner has two moving parts a compressor and a double shafted fan motor. Troubleshooting any system should be knowledge of what the system is and what it is supposed to do.
Safety controls sense operating parameters and shut down the system if undesirable or unsafe conditions occur. Operating controls sense temperatureĪnd signal the system to operate or shut off and rest.
These systems must be controlled and made safe. Electrical Controls Electrical Controls & Troubleshooting System Knowledge, Observation and Attention to DetailĪn HVAC system is designed to combust fuels or consume electrical energy to provide heating or cooling to a conditioned space.
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