The thermostat manual would help you set the heat pump and explain what the various settings will do. If you set fan on Lo and then thermostat to Cool it will run the fan continuously on low and cycle the compressor when cold air is required. If you set fan on high it will run fan continuously on high and cycle compressor as needed. If you set fan on auto or Au the fan and compressor come on and off as needed to lower temp to what you set on thermostat. The fan speed runs as needed (hi or low) automatically. The thermostat manual will tell you how to set fan according to your wishes. Set the fan how you want it to run first, then leave on cool. I'm not sure there is a manual for running the heat pump just the therm. manual. All I got was the installation manual also. As to the crackling, could be expansion and contraction noises or depending on how you set fan to run it can make some clicking noises at times. If I remember correctly after setting to fan you then push + button to set speed to Lo, Hi or Au.
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2012 Rockwood a124
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