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Figure 4-8 outside air outside air condensate drain outside air outside air rev. valve outdoor unit rev. valve outdoor unit indoor unit indoor unit split system air-to-water heat pump split system air-to-water heat pump (in heating mode) (in cooling mode) Figure 4-9 flared copper tube machined brass surface ACR copper tube flare nut In this system, the compressor is located in the outdoor unit. The indoor unit houses the refrigerant-to-water heat exchanger, as well as the circulator and the user interface. Figure 4-8 illustrates the major components in a split system air-to-water heat pump as they would operate in heating and cooling modes. These illustrations show a circulator integrated into the heat pump’s interior unit. Some heat pumps provide this circulator, while others do not. Split system air-to-water heat pumps require refrigeration service tools to install. A typical installation involves running the ACR copper tubing lines between the indoor and outdoor units. The larger tube is called the suction line and the smaller tube is called the liquid line. They typically connect to the indoor and outdoor units using flared joints, as illustrated in Figure 4-9. After the copper tube set has been connected, it needs to be pressure tested to verify that no leaks are present. This is usually done by introducing compressed nitrogen into the tubing until the internal pressure reaches 250 psi. The system should remain under this test pressure for at least an hour while a technician checks for leaks. Any leaks must be repaired and the pressure test repeated until the system test pressure remains stable for at least one hour. The next step is to release the test nitrogen and connect a vacuum pump to the system. The vacuum pump is used to remove essentially all gases and moisture from the 32 heat pump cooling load condenser heating load cooling mode evaporator heating mode refrigerant line set inside refrigerant line set inside compressor TXV evaporator outside compressor TXV condenser outsidePDF Image | Heat Pump Systems 2020
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