One of the minor differences between troubleshooting a geothermal heat pump and an air-to-air heat pump is how to gain access to pressures and temperatures in the water or ground loop.

Question

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In a geothermal heat pump, pressures and temperatures in the water or ground loop can be accessed through a flow center, while in an air-to-air heat pump, pressures and temperatures in the refrigerant can be accessed through service valves.

One of the Minor Differences Between Troubleshooting a Geothermal Heat