A technician needs to check the heating operation of a heat pump that has no gauge access ports. The technician should start by:

A) Installing bolt-on piercing valves on both the gas line and the liquid line.
B) Recovering the system refrigerant using piercing pliers and installing permanent braze-on service valves.
C) Checking the temperature rise across the indoor coil.
D) Installing bolt-on piercing valves on both the high side and low side of the compressor.


C

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