Changing Condensation pipe - advice required

[Deleted member 8436]

My combi condensation pipe travels inside the garage and through the wall to a grid outside in 22.5mm pipe. It freezes up in cold weather. I've now insulated the pipe inside and outside the garage (but not inside the wall) but want to ensure a permanent fix.
My idea is to cut the pipe inside the garage and let it drip into a much larger pipe that goes through the wall and empties into the grid.
My question is, should this larger pipe have a water trap (U bend) inside the garage. Could the water in the trap freeze due to the small amount of water running into it?

 

[moony]

My combi condensation pipe travels inside the garage and through the wall to a grid outside in 22.5mm pipe. It freezes up in cold weather. I've now insulated the pipe inside and outside the garage (but not inside the wall) but want to ensure a permanent fix.
My idea is to cut the pipe inside the garage and let it drip into a much larger pipe that goes through the wall and empties into the grid.
My question is, should this larger pipe have a water trap (U bend) inside the garage. Could the water in the trap freeze due to the small amount of water running into it?

pipe should be in 1 1/4 in garage and outside into the drain. dont mess about with it dripping into pipe etc etc. either lag it to the drain or enlarge to inch and a quarter using a reducer.

 

[Renewable M]

if you have it dripping into the larger pipe, and no trap in the larger pipe you're susceptible to nasty smells, depending on the kind of drain etc.

Q-plumb has it- you can get a rubber bung which the smaller existing condensate pipe (after its own trap) will fit snugly into.