Moving a condenser 8 feet. The run is already 30 feet and unit has been fine for years. The run is all horizontal. Should I put in a trap?
Traps are used when the condenser is above the evaporator coil, 15 to 20 feet or more.
You may have to adjust the charge far the added length, but you shouldn't need the trap.
If you try to fail, and succeed.
Which have you done ?