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Figure 7-23 outside air air rev. valve outdoor unit tankless electric water heater outside isolation / flushing valves ASSE 1017 anti-scald valve DHW CW PRV variable-speed pressure-regulated circulator zone valves copper or stainless steel coils holding domestic water air vent w/ check P&TRV differential pressure valve, set to open at 1 to 1.5 psi indoor unit split system air-to-water heat pump (in heating mode) zone returns reverse indirect preheats domestic water, and buffers space heating loads condenser heating mode refrigerant line set inside compressor TXV evaporator outside indirect tank. Some air-to-water heat pumps can produce a leaving water temperature of up to 130oF under this mode of operation. Be sure that the setpoint controller monitoring the water temperature in the tank is not set so high that the heat pump can never achieve the setting. A maximum suggested setting for the tank thermostat is 5oF lower than the maximum leaving water temperature from the heat pump. One advantage of this approach is that the buffer tank can function in both heating and cooling modes. If the heat pump is operating in cooling mode when a call for domestic water heating occurs, the heat pump switches to heating mode. The diverter valve directs the heated water through the coil of the indirect water heater. Chilled water in the buffer tank is still available to flow to cooling loads while the indirect tank is being heated. REVERSE INDIRECT TANK OPTION Another approach to domestic water heating uses a “reverse” indirect tank to preheat domestic water. A tank-type or tankless electric water heater serves as the supplemental heater. An example of this approach in a “heating only” system, is shown in Figure 7-23. This approach allows the thermal mass of the reverse indirect to buffer space heating as well as domestic water heating. It eliminates the need of a second tank. The tank should be equipped with a large internal coil heat exchanger to minimize the temperature difference between the water in the tank shell and the domestic water inside the coils. The system shown in Figure 7-23 configures the tank as a “2-pipe” buffer. A motorized ball valve is installed in the 66PDF Image | Heat Pump Systems 2020
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