To finish the job they were working on last week (see "Btu Buddy 24: Looking At A Heat Pump Drawing A Lot Of Power"), Bob meets Btu Buddy at the jobsite to change the heat pump's four-way valve on a cool but dry day. It's a good day to work outside. Bob knows that it is best to only open a refrigeration system on a dry day, and it is much better when it is not too cold so that it is comfortable to work outside. Btu Buddy asks Bob what he thinks the best procedure would be to change the valve.
Bob says, "We will have to recover the refrigerant, then turn off and lock out the power supply, and then remove the top of the unit so we can get to the valve. We should then break the vacuum after recovery with dry nitrogen. Then I think we should use the multi-tip torch to remove the piping from the valve. We will have to do it one pipe at a time because there are four pipes. Then we can install the old piping to the new valve in reverse manner. Is that what you would do?"